Induction heating cooker and method for controlling induction heating cooker

Abstract

The invention provides an induction heating cooker and a control method of the induction heating cooker, which can efficiently heat an object to be heated. This induction heating cooker is provided with a top plate, a coil unit, and a controller. The coil unit includes a plurality of coil elements disposed in the heating region. The heating region has a plurality of coil arrangement regions demarcated by an outer peripheral line demarcating the outer periphery of the heating region and a plurality of boundary lines extending from the center of the heating region toward the outer periphery. The coil member is disposed in the coil configuration area. The controller is capable of switching a plurality of heating states in which local intensity distributions for heating the object to be heated are different by controlling a parameter of the current while causing the current to flow through the plurality of coil elements, has a plurality of heating sequences in which one or more heating states are combined, acquires a cooking mode, and switches the plurality of heating sequences in accordance with the cooking mode.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to an induction heating cooker and a control method of an induction heating cooker. BACKGROUND

[0002] For example, in Patent Literature 1, a heating cooker is described, which has a heating unit that heats a heated object, a drive circuit that supplies electric power to the heating unit, a temperature sensor that detects a temperature of the heated object, and a control section that controls the drive circuit.

[0003] PRIOR ART DOCUMENTS

[0004] PATENT LITERATURE

[0005] Patent Literature 1: Japanese Patent No. 7094417 SUMMARY

[0006] However, in the induction heating cooker described in Patent Literature 1, there is a problem that it is difficult to efficiently heat a heated object.

[0007] The induction heating cooker of the present disclosure has a top plate, a coil unit, and a controller. The coil unit is disposed below the top plate. The controller controls heating of a heated object by the coil unit. The coil unit has a plurality of coil pieces disposed in a first heating region that heats the heated object in plan view. The first heating region has a plurality of first coil arrangement regions defined by a first outer periphery line that defines an outer periphery of the first heating region and a plurality of first boundary lines that extend radially from a center of the first heating region toward the outer periphery in plan view. The plurality of coil pieces are disposed in the plurality of first coil arrangement regions in plan view. The controller is capable of switching a plurality of heating states in which the heated object is heated with different local intensity distributions, by flowing a current through all of the plurality of coil pieces while controlling at least a part of parameters of the current flowing through each of the plurality of coil pieces. In addition, the controller has a plurality of heating sequences in which one or more of the plurality of heating states are combined. Furthermore, the controller acquires a cooking mode, and switches the plurality of heating sequences in accordance with the acquired cooking mode.

[0008] The control method of the induction heating cooker of the present disclosure is a method of controlling an induction heating cooker by a controller. The induction heating cooker has a top plate and a coil unit. The coil unit is disposed below the top plate. The coil unit has a plurality of coil pieces disposed in a first heating region that heats a heating target in a plan view. The first heating region has a plurality of first coil arrangement regions demarcated by a first outer periphery line demarcating an outer periphery of the first heating region and a plurality of first boundary lines extending radially from a center of the first heating region toward the outer periphery in a plan view. The plurality of coil pieces are disposed in the plurality of first coil arrangement regions in a plan view. The induction heating cooker can be switched to a plurality of heating states in which local strengths of heating of the heating target differ from each other by controlling at least a part of parameters of electric currents flowing through each of the plurality of coil pieces while causing the electric currents to flow through all of the plurality of coil pieces. In addition, the induction heating cooker has a plurality of heating sequences in which one or more of the plurality of heating states are combined. The method of controlling the induction heating cooker includes a step of acquiring a cooking mode and a step of switching the plurality of heating sequences according to the cooking mode.

[0009] The present disclosure provides an induction heating cooker capable of efficiently heating a heating target and a control method of an induction heating cooker in view of the above-described problem. BRIEF DESCRIPTION OF DRAWINGS

[0010] Figure 1 is a schematic perspective view of an example of an induction heating cooker of Embodiment 1 of the present disclosure.

[0011] Figure 2 is a plan view of an example of a coil unit of Embodiment 1 of the present disclosure.

[0012] Figure 3 is a schematic enlarged view of a coil piece that constitutes the coil unit of Figure 2

[0013] Figure 4 is a block diagram of an example of a structure of an induction heating cooker of Embodiment 1 of the present disclosure.

[0014] Figure 5 is a circuit diagram of an example of an induction heating cooker of Embodiment 1 of the present disclosure.

[0015] Figure 6 is a graph of an example of a current waveform in a case where a phase difference of currents flowing in portions adjacent to each other in two adjacent coil pieces is 0°.

[0016] Figure 7 ​is a graph showing an example of a current waveform in a case where a phase difference of currents flowing in portions adjacent to each other in the two adjacent coil members is 180°.

[0017] Figure 8 is a schematic diagram showing an example of a region in which magnetic flux is concentrated in a first heating state of the induction heating cooker of Embodiment 1 of the present disclosure.

[0018] Figure 9 is a schematic diagram showing an example of a region in which magnetic flux is concentrated in a second heating state of the induction heating cooker of Embodiment 1 of the present disclosure.

[0019] Figure 10 is a schematic diagram showing an example of a region in which magnetic flux is concentrated in a third heating state of the induction heating cooker of Embodiment 1 of the present disclosure.

[0020] Figure 11 is a schematic diagram showing another example of a region in which magnetic flux is concentrated in a fourth heating state of the induction heating cooker of Embodiment 1 of the present disclosure.

[0021] Figure 12 is a schematic diagram showing an example of a region in which magnetic flux is concentrated in a fifth heating state of the induction heating cooker of Embodiment 1 of the present disclosure.

[0022] Figure 13 is a schematic diagram showing another example of a region in which magnetic flux is concentrated in a sixth heating state of the induction heating cooker of Embodiment 1 of the present disclosure.

[0023] Figure 14 is a flowchart showing an example of a method of controlling the induction heating cooker in Embodiment 1 of the present disclosure.

[0024] Figure 15 is a graph showing an example of a curve representing a relationship between a heating time of a heating target and a temperature of the heating target detected by a temperature sensor, an example of a curve representing a relationship between the heating time of the heating target and an oil temperature of oil accommodated in the heating target, and an example of a curve representing a relationship between the heating time of the heating target and a heating state in a first mode of the induction heating cooker of Embodiment 1 of the present disclosure.

[0025] Figure 16 is a graph showing an example of a curve representing a relationship between a heating time of a heating target and a temperature of the heating target detected by a temperature sensor, and an example of a curve representing a relationship between the heating time of the heating target and a heating state in a second mode of the induction heating cooker of Embodiment 1 of the present disclosure.

[0026] Figure 17is a graph of a curve representing an example of a relationship between a heating time of a heating target and a temperature of the heating target detected by a temperature sensor in the third mode of the induction heating cooker of Embodiment 1 of the present disclosure, and a curve representing an example of a relationship between the heating time of the heating target and a heating state.

[0027] Figure 18 is a schematic perspective view of an example of the induction heating cooker of Embodiment 2 of the present disclosure.

[0028] Figure 19 is a top view of an example of the coil unit of the induction heating cooker of Embodiment 2 of the present disclosure.

[0029] Figure 20 is a schematic view representing an example of a region in which magnetic flux is concentrated in the first heating state of the induction heating cooker of Embodiment 2 of the present disclosure.

[0030] Figure 21 is a schematic view representing an example of a region in which magnetic flux is concentrated in the second heating state of the induction heating cooker of Embodiment 2 of the present disclosure.

[0031] Figure 22 is a schematic view representing an example of a region in which magnetic flux is concentrated in the third heating state of the induction heating cooker of Embodiment 2 of the present disclosure.

[0032] Figure 23 is another example of a schematic view representing a region in which magnetic flux is concentrated in the fourth heating state of the induction heating cooker of Embodiment 2 of the present disclosure.

[0033] Figure 24 is an example of a schematic view representing a region in which magnetic flux is concentrated in the fifth heating state of the induction heating cooker of Embodiment 2 of the present disclosure.

[0034] Figure 25 is another example of a schematic view representing a region in which magnetic flux is concentrated in the sixth heating state of the induction heating cooker of Embodiment 2 of the present disclosure.

[0035] Figure 26 is a graph of a curve representing a relationship between a heating time of a heating target and a temperature of the heating target detected by a temperature sensor in the second mode of the induction heating cooker of Modified Example 1, and a curve representing a relationship between the heating time of the heating target and a heating state.

[0036] Figure 27 is a graph of a curve representing a relationship between a heating time of a heating target and a temperature of the heating target detected by a temperature sensor in the third mode of the induction heating cooker of Modified Example 2, and a curve representing a relationship between the heating time of the heating target and a heating state.

[0037] Reference Signs List

[0038] 1A, 1B: Induction heating cooker; 2: Top plate; 3: Housing; 4A, 4B: Coil unit; 5: Controller; 6: Temperature sensor; 7: Transmittance window; 8: Input / output interface device; 10A to 10J: Coil piece; 11: Coil wire; 51: Operation circuit; 52: Storage device; 80: Heating object; 81: Food material; H0: Multiple heating sequences; H1, H2, H11 to H13, H21, H22, H31 to H33, H41 to H46: Heating sequence; S0, S10, S20: Heating area; S1 to S6, S11 to S14: Coil arrangement area; S21 to S26, S31 to S36: Magnetic flux concentration area; L1 to L6, L21 to L25: Boundary line; L10, L20: Outer peripheral line; C1, C2: Center of heating area; M1, M2, M3: Mode; P1 to P6: Heating state; K1 to K3, K11, K12b, K22, K31, K32, K41, K44: Target temperature; K5: Target oil temperature; K4, K12a, K13, K21, K42, K43: Threshold temperature; Step 1: Step of acquiring cooking mode; Step 2: Step of switching multiple heating sequences. DETAILED DESCRIPTION

[0039] (Progress of accomplishing the present disclosure)

[0040] The induction heating cooker described in Patent Literature 1 performs heating control by the control section in such a manner that the temperature of the heated object becomes the target temperature in accordance with the control sequence stored in the storage section that is set in advance for each cooking menu. For example, the induction heating cooker described in Patent Literature 1 performs a preheating process, a holding process, and a cooking process as the heating control in the deep-frying mode. The preheating process is a process of raising the temperature of the pan to a first set temperature that is higher than the target temperature for performing deep-frying cooking. The holding process is a process of maintaining the temperature of the pan at a second set temperature that is higher than the target temperature and lower than the first set temperature after the preheating process. The cooking process is a process performed when the detection of the food material being put into the pan is detected in the holding process. In the cooking process, the temperature of the content such as oil is able to be quickly restored to the target temperature by supplying the heating coil with a larger power than in the preheating process.

[0041] However, the induction heating cooker described in Patent Literature 1 does not change the local intensity distribution of heating to the heating target. Therefore, by supplying large power to the heating coil, the temperature difference of the local part of heating to the heating target further increases. For example, the temperature difference of the local part of heating to the heating target is the difference between the temperature of the part where the local temperature of heating to the heating target is the highest and the temperature of the part where the local temperature of heating to the heating target is the lowest. In addition, there is a problem that if the food material contacts the part where the local temperature of the heating target is high in the state where the temperature difference of the local part of heating to the heating target further increases, the food material is burnt.

[0042] Therefore, the present inventors have researched an induction heating cooker capable of efficiently heating a heating target and a control method of an induction heating cooker in order to solve the above problems, and thus completed the present disclosure.

[0043] Hereinafter, one embodiment of the present disclosure will be described with reference to the drawings. Furthermore, the following description is merely illustrative in nature and is not intended to limit the present disclosure, its application or its uses. Also, the drawings are diagrammatic views in schematic, and the ratios of the dimensions, etc. are not necessarily consistent with the actual situation.

[0044] In addition, in the present specification, the terms "first", "second", and the like are used only for explanation and cannot be understood as indicating or implying relative importance or order of technical features. The features limited as "first" and "second" indicate or imply one or more of the features.

[0045] (Embodiment 1)

[0046] An induction heating cooker of the present embodiment will be described.

[0047] Figure 1 is a schematic perspective view of an example of the induction heating cooker 1A of Embodiment 1 of the present disclosure. Figure 2 is a plan view of one example of the coil unit 4A of Embodiment 1 of the present disclosure. In addition, the X-Y-Z coordinate system shown in the figure is described for the purpose of helping understanding of the invention and is not intended to limit the invention. The X-axis direction indicates the left-right direction, the Y-axis direction indicates the depth direction, and the Z-axis direction indicates the vertical direction.

[0048] As shown in Figure 1 , the induction heating cooker 1A is a cooker that performs induction heating to a heating target 80 that accommodates a food material 81. The heating target 80 is a cooking container. The food material 81 is accommodated in the heating target 80 and is a material that is cooked. For example, the food material 81 refers to food and / or beverage. In addition, oil can also be accommodated in the heating target 80. The induction heating cooker 1A has a top plate 2 and a housing 3.

[0049] The heating target 80 is placed on the top plate 2. The top plate 2 is made of a material having heat resistance. For example, the top plate 2 is made of heat-resistant glass.

[0050] The housing 3 is attached to the lower surface of the top plate 2. Inside the housing 3, a plurality of coil units 4A, a controller 5, a plurality of temperature sensors 6, and an input / output interface device 8 are mounted.

[0051] The plurality of coil units 4A are respectively arranged below the top plate 2. The plurality of coil units 4A respectively perform induction heating on the heating target 80 placed on the opposite portions of the top plate 2. The structure of the coil unit 4A will be described later.

[0052] The controller 5 controls heating of the heating target 80 by the plurality of coil units 4A respectively. The controller 5 controls heating of the heating target 80 by the plurality of coil units 4A respectively in accordance with a cooking mode. For example, the controller 5 acquires the cooking mode, and controls heating of the heating target 80 by the plurality of coil units 4A respectively in accordance with the acquired cooking mode. The structure of the controller 5 will be described later.

[0053] The plurality of temperature sensors 6 are arranged below the top plate 2, and detect the temperature of the heating target 80 placed on the opposite portions of the top plate 2. For example, the temperature sensor 6 is an infrared sensor. The plurality of temperature sensors 6 detect infrared rays via the penetration window 7 provided in the top plate 2. Alternatively, the penetration window 7 provided in the top plate 2 can also transmit infrared rays. The penetration window 7 is provided in the heating region of the heating target 80. The penetration window 7 is circular or polygonal, and is smaller than the heating region of the heating target 80. For example, the temperature sensor 6 performs output corresponding to the amount of detected infrared rays when detecting the infrared rays. Alternatively, the temperature sensor 6 inputs information on the temperature of the heating target 80 to the controller 5 in accordance with the amount of detected infrared rays.

[0054] The input / output interface device 8 has a function as an input device for inputting information from a user and an output device for outputting information to the user. The input / output interface device 8 can include an operation panel for the user to operate the induction heating cooker 1A, a button for the user to change the power, and a display and a speaker for the user to be informed of the state of the induction heating cooker 1A. For example, the user can change the cooking mode described later by operating the input / output interface device 8.

[0055] [Coil Unit]

[0056] Hereinafter, the coil unit 4A will be described in more detail.

[0057] As Figure 2As shown, the coil unit 4A includes a plurality of coil members 10A to 10F disposed in a first heating region SO in the X-Y plane that heats the heating target 80. The plurality of coil members 10A to 10F are constituent elements corresponding to heating coils of a general induction heating cooker.

[0058] The first heating region SO is a closed region having a center Cl in the X-Y plane, and is a region in which the plurality of coil members 10A to 10F are disposed. The first heating region SO is formed in a circular shape in the X-Y plane. In addition, the first heating region SO is a region in which the heating target 80 is disposed on the upper surface of the top plate 2.

[0059] The first heating region SO has a plurality of first coil disposition regions S1 to S6. The plurality of first coil disposition regions S1 to S6 are disposed radially and adjacently in the X-Y plane with the center Cl of the first heating region SO as a center. The plurality of first coil disposition regions S1 to S6 are demarcated in the X-Y plane by a first outer periphery line L10 demarcating the outer periphery of the first heating region SO and a plurality of first boundary lines L1 to L6 extending radially from the center Cl of the first heating region SO toward the outer periphery.

[0060] In the present embodiment, the plurality of first boundary lines L1 to L6 are disposed radially and equidistantly in the X-Y plane with the center Cl of the first heating region SO as a center. The plurality of first boundary lines L1 to L6 are straight lines extending from the center Cl of the first heating region SO toward the outer periphery in the X-Y plane. The angle formed by two first boundary lines adjacent among the plurality of first boundary lines L1 to L6 is substantially the same. The angle formed by two first boundary lines adjacent among the plurality of first boundary lines L1 to L6 is substantially the same, whereby the plurality of first coil disposition regions S1 to S6 have substantially the same shape and substantially the same size in the X-Y plane. In the present specification, "substantially" means within an error of 10%. Preferably, "substantially" means within an error of 5%.

[0061] In the present embodiment, the plurality of first boundary lines L1 to L6 has six first boundary lines L1 to L6. The angle formed by two first boundary lines adjacent is 60 degrees. Thus, the first heating region SO is divided into six first coil disposition regions S1 to S6 that have substantially the same shape and substantially the same size when viewed from above.

[0062] The plurality of coil members 10A to 10F are disposed in the plurality of first coil disposition regions S1 to S6 in the X-Y plane. One coil member is disposed in one first coil disposition region. By disposing one coil member in one first coil disposition region, the plurality of coil members 10A to 10F are disposed radially and adjacently in the first heating region SO in the X-Y plane.

[0063] Each of the plurality of coil pieces 10A to 10F has the coil wire 11 wound and arranged in the plurality of first coil arrangement regions S1 to S6. The coil wire 11 is arranged in the X-Y plane along two adjacent first boundary lines among the plurality of first boundary lines L1 to L6 and a first outer peripheral line L10 connecting the two adjacent first boundary lines. The coil wire 11 is arranged in the first coil arrangement regions S1 to S6 along the first boundary lines L1 to L6 and the first outer peripheral line L10 that define the first coil arrangement regions S1 to S6, and is arranged wound inward.

[0064] In the present embodiment, the plurality of coil pieces 10A to 10F have substantially the same shape and substantially the same size in the X-Y plane.

[0065] Figure 3 is an enlarged view of the coil pieces 10A to 10F of the coil unit 4A that constitutes Figure 2 . Further, Figure 3 indicates the coil piece 10A arranged in the first coil arrangement region S1. The first coil arrangement regions S2 to S6 have the same structure as the first coil arrangement region S1, and thus the description thereof is omitted. In addition, the coil pieces 10B to 10F have the same structure as the coil piece 10A, and thus the description thereof is omitted.

[0066] As shown in Figure 3 , the coil piece 10A arranged in the first coil arrangement region S1 has the coil wire 11 arranged in the X-Y plane along two adjacent first boundary lines L1, L2 and a first outer peripheral line L10 connecting the two adjacent first boundary lines L1, L2. The coil wire 11 is formed of an electrically conductive material.

[0067] The coil wire 11 is arranged in the X-Y plane in a manner of being wound around the first boundary lines L1, L2 and the first outer peripheral line L10 within the first coil arrangement region S1. The coil wire 11 is arranged in the X-Y plane in a frame shape. In the present embodiment, since the first coil arrangement region S1 is formed in a sector shape in the X-Y plane, the outer shape of the coil wire 11 is formed in a sector shape in the X-Y plane.

[0068] In the present embodiment, the coil wire 11 includes a first coil wire portion 20, a second coil wire portion 30, and a third coil wire portion 40. The first coil wire portion 20, the second coil wire portion 30, and the third coil wire portion 40 are integrated. The first coil wire portion 20, the second coil wire portion, and the third coil wire portion 40 are each a wire portion in which a bundle in which a plurality of metal wires are twisted is wound a plurality of turns. For example, the wire portion is a bundle in which 20 or so copper wires each having a diameter of 0.2 mm are twisted and bound, which is wound 60 turns or so. Note that the diameter of the metal wires is not limited to 0.2 mm, but can be appropriately selected. Also, the diameter of the metal wires can be appropriately selected within a range of 0.01 mm or more and 0.5 mm or less. Further, the material of the metal wires is not limited to copper, but can be, for example, aluminum or a clad material of copper and aluminum. Note that the number of the metal wires that are bundled (i.e., so-called core number) is not limited to 20, but can be appropriately selected. For example, the core number can be appropriately selected within a range of 5 or more and 50 or less. Also, the number of turns of the wire portion is not limited to 10, but can be appropriately set. For example, the number of turns can be appropriately selected within a range of 5 or more and 20 or less.

[0069] The first coil wire portion 20 is disposed along the two adjacent first boundary lines L1, L2 and the first outer peripheral line L10 in the X-Y plane. The first coil wire portion 20 is a portion of the coil wire 11 that is disposed at the outermost side of the coil member 10A in the X-Y plane. The first coil wire portion 20 is formed in a frame shape in the X-Y plane. The outer shape of the first coil wire portion 20 is formed in a fan shape in the X-Y plane.

[0070] The first coil wire portion 20 includes straight line portions 21, 22, a curved line portion 23, and connecting portions 24, 25, 26. The straight line portion 21 is a substantially straight line-shaped coil portion that is disposed along the first boundary line L1. The straight line portion 22 is a substantially straight line-shaped coil portion that is disposed along the first boundary line L2. The curved line portion 23 is a curved line-shaped coil portion that is disposed along the first outer peripheral line L10. The connecting portion 24 is a coil portion that connects one end of the straight line portion 21 and one end of the straight line portion 22 on the center Cl side of the first heating region SO in the X-Y plane. The connecting portion 25 is a coil portion that connects the other end of the straight line portion 21 and one end of the curved line portion 23 on the first outer peripheral line L10 side of the first heating region SO in the X-Y plane. The connecting portion 26 is a coil portion that connects the other end of the straight line portion 22 and the other end of the curved line portion 23 on the first outer peripheral line L10 side of the first heating region SO in the X-Y plane. The connecting portions 24, 25, 26 have shapes that are bent in a U shape.

[0071] In the present disclosure, "arranged along the first boundary line L1, L2 or the first outer peripheral line L10" means arranged extending along a direction substantially the same as the extending direction of the first boundary line L1, L2 or the first outer peripheral line L10, without arranging other portions that shield between the first boundary line L1, L2 or the first outer peripheral line L10, unless specifically mentioned.

[0072] The second coil wire portion 30 is arranged inside the first coil wire portion 20 in the X-Y plane. In the present embodiment, the second coil wire portion 30 is arranged along the inside of the first coil wire portion 20 in the X-Y plane. The second coil wire portion 30 is formed in a frame shape along the inside of the first coil wire portion 20 in the X-Y plane. The outer shape of the second coil wire portion 30 is formed in a fan shape in the X-Y plane.

[0073] The second coil wire portion 30 includes straight line portions 31, 32, a curved line portion 33, and connecting portions 34, 35, 36. The straight line portion 31 is a straight line-shaped coil portion arranged along the straight line portion 21 of the first coil wire portion 20. The straight line portion 32 is a straight line-shaped coil portion arranged along the straight line portion 22 of the first coil wire portion 20. The curved line portion 33 is a curved line-shaped coil portion arranged along the curved line portion 23 of the first coil wire portion 20. The connecting portion 34 is a coil portion connecting one end of the straight line portion 31 and one end of the straight line portion 32 on the center Cl side of the first heating region S0 in the X-Y plane. The connecting portion 35 is a coil portion connecting the other end of the straight line portion 31 and one end of the curved line portion 33 on the first outer peripheral line L10 side of the first heating region S0 in the X-Y plane. The connecting portion 36 is a coil portion connecting the other end of the straight line portion 32 and the other end of the curved line portion 33 on the first outer peripheral line L10 side of the first heating region S0 in the X-Y plane. The connecting portions 34, 35, 36 have a shape bent in a U shape.

[0074] The third coil wire portion 40 is arranged inside the second coil wire portion 30 in the X-Y plane. In the present embodiment, the third coil wire portion 40 is arranged along the inside of the second coil wire portion 30 in the X-Y plane. The third coil wire portion 40 is formed in a frame shape along the inside of the second coil wire portion 30 in the X-Y plane. The outer shape of the third coil wire portion 40 is formed in a fan shape when viewed from above.

[0075] The third coil wire portion 40 includes straight line portions 41, 42, a curved line portion 43, and connecting portions 44, 45, 46. The straight line portion 41 is a straight line-shaped coil portion arranged along the straight line portion 31 of the second coil wire portion 30. The straight line portion 42 is a straight line-shaped coil portion arranged along the straight line portion 32 of the second coil wire portion 30. The curved line portion 43 is a curved line-shaped coil portion arranged along the curved line portion 33 of the second coil wire portion 30. The connecting portion 44 is a coil portion connecting one end of the straight line portion 41 and one end of the straight line portion 42 on the center Cl side of the first heating region SO in the X-Y plane. The connecting portion 45 is a coil portion connecting the other end of the straight line portion 41 and one end of the curved line portion 43 on the first outer peripheral line L10 side of the first heating region SO in the X-Y plane. The connecting portion 46 is a coil portion connecting the other end of the straight line portion 42 and the other end of the curved line portion 43 on the first outer peripheral line L10 side of the first heating region SO in the X-Y plane. The connecting portions 44, 45, 46 have a shape bent in a U shape.

[0076] In the present embodiment, the straight line portions 21, 31, 41 are arranged substantially in parallel with each other. The straight line portions 22, 32, 42 are arranged substantially in parallel with each other. The curved line portions 23, 33, 43 are arranged opposite to each other.

[0077] [Controller]

[0078] Hereinafter, the controller 5 will be described in more detail.

[0079] Figure 4 is a block diagram of an example of a structure of the induction heating cooker 1A of Embodiment 1 of the present disclosure.

[0080] The controller 5 is a control device that controls the operation of the induction heating cooker 1A. For example, the controller 5 controls the operation of each of the coil units 4A. Specifically, the controller 5 controls the operation of each of the coil units 4A, and controls the heating of the heating target object 80 by the coil units 4A. In addition, the controller 5 controls at least a part of the parameters of the current flowing through each of the plurality of coil pieces 10A to 10F while causing the current to flow through all of the plurality of coil pieces 10A to 10F.

[0081] As shown in Figure 4 , the controller 5 includes an arithmetic circuit 51 and a storage device 52.

[0082] The arithmetic circuit 51 performs processing in the controller 5. The arithmetic circuit 51 includes a general-purpose processor such as a CPU or an MPU that realizes a prescribed function by executing a program. For example, the arithmetic circuit 51 is configured to be able to communicate with the storage device 52, and realizes various processing in the controller 5 by calling and executing an arithmetic program or the like held in the storage device 52. Specifically, the processing of the arithmetic circuit 51 includes control of the local intensity of heating of the plurality of coil members 10A to 10F, output of a control signal to the inverter circuit described later, or acquisition of temperature information of the heating target object 80.

[0083] The arithmetic circuit 51 is not limited to a manner in which a prescribed function is realized by cooperation of hardware resources and software, and can also be a hardware circuit that is specially designed to realize a prescribed function. For example, the arithmetic circuit 51 can be realized by various processors such as a GPU, an FPGA, a DSP, an ASIC, or the like in addition to a CPU or an MPU. In addition, the arithmetic circuit 51 realized by various processors such as a GPU, an FPGA, a DSP, an ASIC, or the like can be constituted by a signal processing circuit that is a semiconductor integrated circuit.

[0084] The storage device 52 is a storage medium that is able to store various information. For example, the storage device 52 stores a program for realizing various processing performed by the arithmetic circuit 51. The storage device 52 stores a plurality of cooking modes and a plurality of heating sequences H0. In addition, the storage device 52 can also store information such as temperature information of the heating target object 80 that is acquired by the controller 5 through the plurality of coil members 10A to 10F.

[0085] The storage device 52 is realized by, for example, a memory such as a DRAM, an SRAM, a flash memory, or the like, an HDD, an SSD, another storage device, or an appropriate combination thereof. The storage device 52 stores a program for realizing various processing performed by the arithmetic circuit 51 as described above.

[0086] For example, the user is able to select a cooking mode from the input-output interface device 8 in accordance with a cooking method of the food material 81. The cooking modes include a first mode M1 in which deep-frying cooking is performed, a second mode M2 in which grilling cooking is performed, and a third mode M3 in which boiling cooking is performed. In addition, each of the cooking modes can have a plurality of processes. Furthermore, each of the cooking modes can have a plurality of cooking recipe modes in which one or more of the plurality of processes are combined. For example, the plurality of cooking recipe modes are cooking modes that are more suitable for the cooking method of the food material 81 on the basis of making a prescribed dish.

[0087] The first mode M1 is a cooking mode in which the food material 81 is heated with heated oil. For example, in the first mode M1, the heating target object 80 is heated by the induction heating cooker 1A, whereby the oil accommodated in the heating target object 80 is heated, and the food material 81 is heated and cooked by the heated oil. Specifically, the first mode M1 is a cooking mode in which the food material 81 is heated and cooked with heated oil as in "tempura", "French fries". The first mode M1 can change the target oil temperature. For example, the target oil temperature can be changed by the input / output interface device 8.

[0088] The first mode M1 includes a preheating process, a temperature adjustment process, and a load detection process. The preheating process is a process of raising the oil to a prescribed temperature. The temperature adjustment process is a process of maintaining the heating target object 80 at a prescribed temperature and waiting for the food material 81 to be put in, and detecting a case where the food material 81 is put in. The load detection process is a process of rapidly raising the temperature of the oil lowered by the putting in of the food material 81 and maintaining it at a prescribed temperature suitable for the put-in food material 81, and frying the food material 81. In the preheating process, the induction heating cooker 1A heats the heating target object 80 until the temperature of the heating target object 80 reaches a first target temperature. For example, the first target temperature is the temperature of the heating target object 80 when the oil accommodated in the heating target object 80 reaches the target oil temperature. In addition, the first target temperature can change according to the target oil temperature changed by the user through the input / output interface device 8. In the temperature adjustment process, the induction heating cooker 1A maintains the temperature of the heating target object 80 at a second target temperature after the preheating process is completed. For example, the second target temperature is the temperature of the heating target object 80 that can maintain the oil accommodated in the heating target object 80 at the target oil temperature. In the load detection process, the induction heating cooker 1A heats the heating target object 80 in which the food material 81 is put in, with a larger power than the power with which the heating target object 80 is heated in the temperature adjustment process, when it is detected that the food material 81 is put in the heating target object 80.

[0089] The second mode M2 is a cooking mode in which the food material 81 is heated with heat of the heating target object 80 heated by the induction heating cooker 1A. For example, the second mode M2 is a cooking mode in which the food material 81 (for example, pork, fish, bread) is heated and cooked with heat from the heating target object 80 (for example, a frying pan) as in "grilled pork", "grilled fish", "French toast".

[0090] In the plurality of cooking recipe modes of the second mode M2, the combinations of the plurality of processes can be different, respectively, or can be the same. For example, the plurality of cooking recipe modes of the second mode M2 include a food material heating preparation process, a temperature adjustment process, and a cooking process. The food material heating preparation process is a process of raising the heating target object 80 to a prescribed temperature. The temperature adjustment process is a process of maintaining the heating target object 80 at a prescribed temperature and waiting for the placement of the food material 81, and detecting a case where the food material 81 is placed. The cooking process is a process of maintaining at a prescribed temperature suitable for the placed food material 81 and cooking the food material. In the food material heating preparation process, the induction heating cooker 1A heats the heating target object 80 until the temperature of the heating target object 80 reaches a first target temperature. In the temperature adjustment process, the induction heating cooker 1A maintains the temperature of the heating target object 80 at the first target temperature after the completion of the food material heating preparation process. In the cooking process, the induction heating cooker 1A heats the heating target object 80 using a heating power different from that in the temperature adjustment process when it is detected that the food material 81 is placed in the heating target object 80. In addition, in the cooking process, the food material 81 is heated via the heating target object 80.

[0091] The third mode M3 is a mode of cooking the food material 81. For example, the third mode M3 is a cooking mode in which the heating target object 80 accommodates the food material 81 containing moisture, and the induction heating cooker 1A heats the heating target object 80 to heat the food material 81 containing moisture. In addition, the third mode M3 can also be a cooking mode suitable for accommodating and heating the food material 81 in a liquid state and the food material 81 in a solid state in the heating target object 80. Specifically, the third mode M3 is a cooking mode in which the food material 81 containing moisture is heated using heat from the heating target object 80 (for example, a pot) heated by the induction heating cooker 1A, like "curry", "stew", and "pot roast".

[0092] In the plurality of cooking recipe modes of the third mode M3, the combinations of the plurality of processes can be different, respectively, or can be the same. For example, the plurality of cooking recipe modes of the third mode M3 include a first heating process and a second heating process. The first heating process is a process of raising the heating target object 80 to a prescribed temperature. The second heating process is a process of maintaining the heating target object 80 at a prescribed temperature suitable for the food material 81 and cooking the food material 81. In the first heating process, the induction heating cooker 1A heats the heating target object 80 until the temperature of the heating target object 80 reaches a first target temperature. The second heating process heats the heating target object 80 in order to maintain the temperature of the heating target object 80 at the first target temperature after the completion of the first heating process.

[0093] The plurality of heating sequences H0 includes a combination of at least one or more heating states in which the heating object 80 is heated in a local strength distribution different from each other. The plurality of heating sequences H0 is switched according to the cooking mode. For example, the plurality of heating sequences H0 switches the heating sequence according to a plurality of processes of the cooking mode.

[0094] [Circuit]

[0095] Figure 5 is a circuit diagram of an example of the induction heating cooker 1A of Embodiment 1 of the present disclosure.

[0096] As described above, the induction heating cooker 1A is provided with the plurality of coil pieces 10A to 10F that constitute the coil unit 4A. The induction heating cooker 1A has electronic components for achieving heating by the plurality of coil pieces 10A to 10F, the diode bridge 61, the smoothing capacitor 62, the plurality of inverter circuits 63A to 63F, and the plurality of resonance capacitors 64A to 64F, 65A to 65F. The induction heating cooker 1A can have the same structure of circuit for each of the plurality of coil units 4A, or can have different structures of circuit. Hereinafter, in a case where it is not necessary to distinguish the plurality of inverter circuits 63A to 63F, they are collectively referred to as the inverter circuit 63 or the plurality of inverter circuits 63. Hereinafter, in a case where it is not necessary to distinguish the plurality of resonance capacitors 64A to 64F, they are collectively referred to as the resonance capacitor 64 or the plurality of resonance capacitors 64. Hereinafter, in a case where it is not necessary to distinguish the plurality of resonance capacitors 65A to 65F, they are collectively referred to as the resonance capacitor 65 or the plurality of resonance capacitors 65.

[0097] The diode bridge 61 is connected to an alternating-current power supply (for example, a commercial alternating-current power supply of 100 V or 200 V) 50, performs full-wave rectification of an alternating-current voltage input from the alternating-current power supply, converts it into a direct-current voltage having a pulsating current, and applies it between a wiring 66A and a wiring 66B.

[0098] The smoothing capacitor 62 is connected between the wiring 66A and the wiring 66B, and smoothes the voltage applied from the diode bridge 61.

[0099] The switching elements 67A, 68A of the inverter circuit 63A are connected in series between the wiring 66A and the wiring 66B. Each of the switching elements 67A, 68A has an IGBT and a diode connected in anti-parallel to the IGBT. Each of the switching elements 67A, 68A switches on / off based on a control signal received from the controller 5. The inverter circuits 63B to 63F have switching elements 67B to 67F and switching elements 68B to 68F. The inverter circuits 63B to 63F have the same structure as the inverter circuit 63A, and thus the description is omitted. The switching elements 67B to 67F and the switching elements 68B to 68F have the same structure as the switching elements 67A, 68A, respectively, and thus the description is omitted.

[0100] The resonance capacitor 64A and the resonance capacitor 65A are connected in series between the wiring 66A and the wiring 66B. The resonance capacitors 64B to 64F and the resonance capacitors 65B to 65F are configured in the same manner as the resonance capacitors 64A and 65A, respectively.

[0101] One end of the coil unit 10A is connected between the switching element 67A and the switching element 68A, and the other end is connected between the resonance capacitor 64A and the resonance capacitor 65A. The coil unit 10A is controlled in such a manner that a high-frequency current having a prescribed parameter flows by switching the on / off of the switching elements 67A and 68A. The other coil units 10B to 10F have the same structure as the coil unit 10A, and thus the description is omitted.

[0102] For example, the controller 5 can control the operation of the inverter circuit 63 to control the current flowing through the plurality of coil units 10A to 10F of the coil unit 4A. In addition, the controller 5 can control the operation of the inverter circuit 63 to control the inverter circuit 63 in such a manner that a high-frequency current always flows through the plurality of coil units 10A to 10F when the coil unit 4A heats the heating target 80. Further, the controller 5 can switch a plurality of heating states in which the heating of the heating target 80 is locally distributed in different strengths by controlling the current flowing through each of the plurality of coil units 10A to 10F. In the present embodiment, the circuit of the coil unit 4A includes a plurality of inverter circuits 63, but is not limited thereto, and can be configured to control the current flowing through the plurality of coil units 10A to 10F by a single inverter circuit.

[0103] [Heating State]

[0104] In the induction heating cooker 1A of Embodiment 1 of the present disclosure, a heating state in which the heating of the heating target 80 is locally distributed in different strengths is described.

[0105] The induction heating cooker 1A of Embodiment 1 of the present disclosure is capable of controlling the intensity of local heating when heating the heating target object 80 placed on the top plate 2. For example, the controller 5 controls at least a part of the parameters of the current flowing through each of the plurality of coil pieces 10A to 10F while causing the current to flow through all of the plurality of coil pieces 10A to 10F, whereby the intensity of local heating can be controlled. The heating state indicates a state in which a region in which heating is strong or a region in which heating is weak is locally generated. Therefore, in a case where the controller 5 controls to heat the heating target object 80 in a prescribed heating state, a prescribed portion of the heating target object 80 corresponding to the prescribed current parameters can be more easily heated than other portions. For example, the heating state can be stored in the storage device 52 together with the current parameters that achieve the heating state. In addition, the control of at least a part of the parameters of the current flowing through the plurality of coil pieces 10A to 10F by the controller 5 can not necessarily be controlled to become a predetermined heating state. In addition, the current parameters that can heat a prescribed region more strongly (or more weakly) can be stored in the storage device 52, and in a case where there are a plurality of regions that require strong heating, the controller 5 combines the stored information to control heating.

[0106] In the induction heating cooker 1A, as described above, the plurality of coil pieces 10A to 10F are arranged in the plurality of first coil arrangement regions S1 to S6 delineated by the first outer periphery line L10 delineating the outer periphery of the first heating region SO and the plurality of first boundary lines L1 to L6 extending radially from the center CI of the first heating region SO toward the outer periphery. For example, the two adjacent coil pieces 10A and 10B are arranged in the two adjacent first coil arrangement regions S1 and S2, respectively. The first coil arrangement regions S1 and S2 are delineated by the shared first boundary line L2. Therefore, a part of the coil piece 10A and a part of the coil piece 10B are arranged along the first boundary line L2.

[0107] The controller 5 is capable of controlling the current flowing in the coil pieces 10A and 10B so that the current flowing through the portion along the first boundary line L2 in the coil piece 10A and the current flowing through the portion along the first boundary line L2 in the coil piece 10B have a prescribed phase difference. The portion along the first boundary line L2 in the coil piece 10A corresponds to the straight portion 21, 31, or 41 of the coil wire 11. Figure 3 The straight portion 22, 32, or 42 of the coil wire 11 described above. In a case where the coil piece 10A illustrated in FIG. 10 is regarded as the coil piece 10B, the portion along the first boundary line L2 in the coil piece 10B corresponds to the straight portion 21, 31, or 41 of the coil wire 11. Figure 3 The straight portion 22, 32, or 42 of the coil wire 11 described above. In a case where the coil piece 10A illustrated in FIG. 10 is regarded as the coil piece 10B, the portion along the first boundary line L2 in the coil piece 10B corresponds to the straight portion 21, 31, or 41 of the coil wire 11.

[0108] For example, the controller 5 can control the currents in such a manner that the phase difference is 0° as the prescribed phase difference, that is, in such a manner that the currents become in-phase. Also, when the currents are controlled in such a manner that the currents become in-phase, the controller 5 can heat the portion of the heating target 80 placed in the region corresponding to the portions adjacent to each other of the coil member 10A and the coil member 10B more strongly than other portions of the heating target 80. Also, by the currents controlled to be in-phase, the controller 5 can heat the local portion of the heating target 80 more strongly than the portion of the heating target 80 placed in the region corresponding to other portions of the coil member 10A and the coil member 10B.

[0109] The region corresponding to the portions adjacent to each other is a region in the top plate 2 in the vertical direction (Z-axis direction) of the portions. Also, the region corresponding to other portions is a region in the top plate 2 on the upper side in the vertical direction of the portions other than the adjacent portions of the coil members 10A, 10B (the central portion or the outer peripheral portion).

[0110] Figure 6 is a graph showing an example of a current waveform in the case where the phase difference of the currents flowing through the portions adjacent to each other of two coil members is 0°. Figure 6 (a) of is a graph showing a waveform of the current flowing through the portion of the coil member 10A along the first boundary line L2. Figure 6 (b) of is a graph showing a waveform of the current flowing through the portion of the coil member 10B along the first boundary line L2. Figure 6 Each current waveform shown in is of the same frequency and the same amplitude, but is not limited thereto. Figure 6 The current waveform shown in indicates the case where the currents flow clockwise in the coil member 10A and the coil member 10B as the positive direction current. As Figure 6 As shown in, the controller 5 can control the currents in such a manner that the phase difference of the currents flowing through the portions adjacent to each other is 0° by controlling the inverter circuit 63 so that the current flowing through the coil member 10A and the current flowing through the coil member 10B flow in opposite directions.

[0111] For example, the controller 5 can control the currents in such a manner that the phase difference is 180° as the prescribed phase difference. Also, by controlling the currents in such a manner that the phase difference is 180°, the controller 5 can heat the portion of the heating target 80 placed in the region corresponding to the outer peripheral portions of the coil member 10A and the coil member 10B more strongly than other portions of the heating target 80. By the currents controlled to have the phase difference of 180°, the controller 5 can heat the local portion of the heating target 80 more strongly than the portion of the heating target 80 placed in the region corresponding to the inner portions of the coil member 10A and the coil member 10B.

[0112] The region corresponding to the outer peripheral portion is a region in the top plate 2 on the vertical direction upper side (Z direction) of the periphery of the coil member 10A and the coil member 10B. Also, the region corresponding to the inner portion is a region in the top plate 2 on the vertical direction upper side of the inside of the coil member 10A and the coil member 10B. The region corresponding to the inner portion can also be a region in the top plate 2 surrounded by the region corresponding to the outer peripheral portion.

[0113] Figure 7 The graph of (a) in FIG. 10 is an example of a line graph indicating a current waveform in the case where the phase difference of the currents flowing through the portions adjacent to each other in the two adjacent coil members is 180°. Figure 7 The graph of (a) in FIG. 10 is an example of a line graph indicating a current waveform in the case where the phase difference of the currents flowing through the portions adjacent to each other in the two adjacent coil members is 180°. Figure 7 The graph of (b) in FIG. 10 is a line graph indicating a current waveform flowing through the portion along the first boundary line L2 in the coil member 10B. Figure 7 Each of the current waveforms shown in FIG. 10 has the same frequency and the same amplitude, but is not limited thereto. Figure 7 The current waveforms shown in FIG. 10 indicate the case where the currents flow clockwise in the coil member 10A and the coil member 10B as the positive direction current. As shown in FIG. 10, the controller 5 controls the inverter circuit 63 in such a manner that the current flowing through the coil member 10A and the current flowing through the coil member 10B flow in the same direction, and thus can control the currents in such a manner that the phase difference of the currents flowing through the adjacent portions becomes 180°. Figure 7 The graph of (a) in FIG. 10 is an example of a line graph indicating a current waveform in the case where the phase difference of the currents flowing through the portions adjacent to each other in the two adjacent coil members is 180°.

[0114] The prescribed phase difference is not limited to 0° or 180°, and can be 30°, 45°, 60°, or 90°. Also, the prescribed phase difference can be another difference.

[0115] Also, the controller 5 can control the local strength of the heating of the heating target 80 by controlling the inverter circuit 63 in such a manner that the currents flowing through the two adjacent coil members have a prescribed frequency difference. That is, the controller 5 can control the local strength of the heating of the heating target 80 by controlling the inverter circuit 63 in such a manner that the current flowing through the coil member 10A and the current flowing through the coil member 10B have a prescribed frequency difference. In the controller 5, the frequency difference between the current flowing through the coil member 10A and the current flowing through the coil member 10B can be, for example, 0, or can be an integer multiple of 1 or more times the frequency of the current flowing through one of the coil members. That is, the frequency difference can be an integer multiple of 0 or more times the frequency of the current flowing through one of the coil members. However, the frequency difference is not limited thereto, and the controller 5 can control the inverter circuit 63 in such a manner that the frequency difference is an integer multiple of 0 or more times. Also, the controller 5 can control the frequency and the phase of the currents in such a manner that the peak values of the amplitudes of the currents flowing through the respective coil members of the plurality of coil members 10A to 10F at least partially coincide.

[0116] The controller 5 can control the strength of the local heating of the heating target 80 by causing a current having a prescribed parameter of current to flow through each of the plurality of coil members 10A to 10F. Thus, the controller 5 can heat the heating target 80 placed on the top plate 2 in a prescribed heating state by controlling the parameter of the current. The parameter of the current includes the amplitude, the phase, and the frequency of the current. The controller 5 can control the parameter of the current flowing through each of the plurality of coil members 10A to 10F, for example, by controlling the on / off of the inverter circuit 63. In the present embodiment, the heating states include the first to sixth heating states, but are not limited to the first to sixth heating states.

[0117] The details of each of the first to sixth heating states will be described. The first to sixth heating states are classified by the relationship (first to fourth parameters) of the parameters of the currents flowing through the positions adjacent to each other of the plurality of coil members 10A to 10F.

[0118] [First Parameter]

[0119] Hereinafter, the parameter shown in Table 1 will be referred to as the first parameter. The heating target 80 can heat the prescribed positions more strongly than other positions in correspondence with the first parameter by causing the controller 5 to cause a current having the first parameter to flow through each of the coil members 10A to 10F.

[0120] [Table 1]

[0121]

[0122] In Table 1, the relationship of the parameters of the currents flowing through the positions adjacent to each other refers to the relationship of the parameters of the currents flowing through the positions adjacent to each other of two coil members adjacent to each other (for example, the coil member 10A and the coil member 10B). The relationship is the same in the parameters shown in Tables 2 to 6 described later.

[0123] As shown in Table 1, in the first parameter, the currents flowing through the positions adjacent to each other have relatively the same amplitude. In the first parameter, the currents flowing through the positions adjacent to each other have relatively no phase difference and are in phase. In the first parameter, the currents flowing through the positions adjacent to each other have relatively the same frequency.

[0124] As an example of the heating state when the controller 5 controls the currents of all groups of two coil members adjacent to each other to be the first parameter, the first heating state will be described.

[0125] Figure 8 is a schematic diagram showing an example of a region in which the magnetic flux is concentrated in the first heating state of the induction heating cooker 1A of Embodiment 1 of the present disclosure.

[0126] InFigure 8 In the example shown in FIG. 1, six coil pieces 10A to 10F are described as the coil unit 4A. Figure 8 The plurality of coil pieces 10A to 10F shown in FIG. 1 correspond to Figure 2 The plurality of coil pieces 10A to 10F shown in FIG. 1 correspond to Figure 8 In the example shown in FIG. 1, the first coil wire portion 20, the second coil wire portion 30, and the third coil wire portion 40 described in the example shown in FIG. 1 are omitted for simplicity, and are represented as a single coil wire with respect to the plurality of coil pieces 10A to 10F. In addition, the plurality of coil pieces 10A to 10F are not limited thereto, and for example, other coil wires can be arranged in the central portions of the plurality of coil pieces 10A to 10F, respectively. In addition, the plurality of coil pieces 10A to 10F can be arranged in a manner other than the example shown in FIG. 1. Figure 3 In the example shown in FIG. 1, the first coil wire portion 20, the second coil wire portion 30, and the third coil wire portion 40 described in the example shown in FIG. 1 are omitted for simplicity, and are represented as a single coil wire with respect to the plurality of coil pieces 10A to 10F. In addition, the plurality of coil pieces 10A to 10F are not limited thereto, and for example, other coil wires can be arranged in the central portions of the plurality of coil pieces 10A to 10F, respectively. In addition, the plurality of coil pieces 10A to 10F can be arranged in a manner other than the example shown in FIG. 1. Figures 9-13 The plurality of coil pieces 10A to 10F shown in FIG. 1 also correspond to Figure 8 The plurality of coil pieces 10A to 10F shown in FIG. 1 also correspond to Figure 2 The plurality of coil pieces 10A to 10F shown in FIG. 1 also correspond to

[0127] As shown in FIG. 1, the current flowing through the plurality of coil pieces 10A to 10F is controlled by the controller 5 to have a first parameter with respect to each of the plurality of coil pieces 10A to 10F. As a result, the magnetic flux is concentrated in the region S20. The region S20 is a region corresponding to a portion along the first outer circumferential line L10 of each of the plurality of coil pieces 10A to 10F. For example, the heating target object 80 in the region S20 can be heated more strongly than the heating target object 80 in a region corresponding to a portion other than the portion along the first outer circumferential line L10 of each of the plurality of coil pieces 10A to 10F. Figure 8 As shown in FIG. 1, the current flowing through the plurality of coil pieces 10A to 10F is controlled by the controller 5 to have a first parameter with respect to each of the plurality of coil pieces 10A to 10F. As a result, the magnetic flux is concentrated in the region S20. The region S20 is a region corresponding to a portion along the first outer circumferential line L10 of each of the plurality of coil pieces 10A to 10F. For example, the heating target object 80 in the region S20 can be heated more strongly than the heating target object 80 in a region corresponding to a portion other than the portion along the first outer circumferential line L10 of each of the plurality of coil pieces 10A to 10F.

[0128] [Second Parameter]

[0129] Hereinafter, the parameter shown in Table 2 is referred to as a second parameter. The controller 5 causes the current having the second parameter to flow through each of the coil pieces 10A to 10F, and as a result, a prescribed portion of the heating target object 80 can be heated more strongly than other portions in correspondence with the second parameter.

[0130] [Table 2]

[0131]

[0132] As shown in Table 2, in the second parameter, the currents flowing through portions adjacent to each other have relatively the same magnitude. In the second parameter, the currents flowing through portions adjacent to each other have opposite phases (i.e., a phase difference of 180°). In the second parameter, the currents flowing through portions adjacent to each other have relatively the same frequency.

[0133] As an example of a heating state when the controller 5 controls the current in such a manner as to become the second parameter with respect to each of the plurality of coil pieces 10A to 10F, a second heating state is described.

[0134] Figure 9is a schematic view indicating an example of a region in which magnetic flux is concentrated in the second heating state in the induction heating cooker 1A of Embodiment 1 of the present disclosure.

[0135] As shown in Figure 9 , the controller 5 controls the current flowing through the plurality of coil members 10A to 10F to be the current having the second parameter for all groups of the two adjacent coil members, whereby the magnetic flux is concentrated in the region S22. The region S22 is a region corresponding to the portions of the plurality of coil members 10A to 10F along the first outer peripheral line L10. For example, the heating target object 80 on the region S22 can be heated more strongly than the heating target object 80 on the corresponding region of the center of at least one of the plurality of coil members 10A to 10F.

[0136] [Third Parameter]

[0137] Hereinafter, the parameter shown in Table 3 is referred to as a third parameter. The controller 5 causes the current having the third parameter to flow through each of the coil members 10A to 10F, whereby a prescribed portion of the heating target object 80 can be heated more strongly than other portions in correspondence with the third parameter.

[0138] [Table 3]

[0139]

[0140] As shown in Table 3, in the third parameter, the currents flowing through the portions adjacent to each other have different amplitudes. In the third parameter, the currents flowing through the portions adjacent to each other have the same phase with no phase difference therebetween. In the third parameter, the currents flowing through the portions adjacent to each other have frequencies that are relatively the same.

[0141] The controller 5 controls the current for all groups of the two adjacent coil members in such a manner as to become the third parameter shown in Table 3. For example, the controller 5 controls the current in such a manner that the coil members having large amplitudes of the current and the coil members having small amplitudes of the current are alternately arranged. In addition, the controller 5 can change the region in which the magnetic flux is concentrated by changing the amplitudes of the currents flowing in the plurality of coil members 10A to 10F. The region in which the magnetic flux is concentrated is a region in which the coil member flowing the current having a large amplitude among the two adjacent coil members is disposed among the portions adjacent to each other of the two adjacent coil members among the plurality of coil members 10A to 10F. In addition, the region in which the magnetic flux is concentrated can heat the heating target object 80 more strongly than the region in which the magnetic flux is not concentrated. That is, the controller 5 can change the heating state by changing the amplitudes of the currents flowing through the plurality of coil members 10A to 10F, respectively.

[0142] As examples of the heating state when the controller 5 controls the current for all groups of the two adjacent coil members in such a manner as to become the third parameter, two examples (a third heating state and a fourth heating state) are described, respectively.

[0143] The third heating state will be described.

[0144] Figure 10 is a schematic diagram showing an example of a region in which magnetic flux is concentrated in the third heating state in the induction heating cooker 1A of Embodiment 1 of the present disclosure.

[0145] As shown in Figure 10 , in the third parameter, the controller 5 controls the current in such a manner that the amplitudes of the currents flowing through the coil pieces 10B, 10D, and 10F are larger than the amplitudes of the currents flowing through the coil pieces 10A, 10C, and 10E, whereby the magnetic flux is concentrated in the region S23. The region S23 is a region in which the coil pieces 10B, 10D, and 10F are arranged at adjacent portions of two adjacent coil pieces among the plurality of coil pieces 10A to 10F. The heating state in which the magnetic flux is concentrated in the region S23 is set as the third heating state.

[0146] The fourth heating state will be described.

[0147] Figure 11 is an example of a region in which magnetic flux is concentrated in the fourth heating state in the induction heating cooker 1A of Embodiment 1 of the present disclosure.

[0148] As shown in Figure 11 , in the fourth parameter, the controller 5 controls the current in such a manner that the amplitudes of the currents flowing through the coil pieces 10A, 10C, and 10E are larger than the amplitudes of the currents flowing through the coil pieces 10B, 10D, and 10F, whereby the magnetic flux is concentrated in the region S24. The region S24 is a region in which the coil pieces 10A, 10C, and 10E are arranged at adjacent portions of two adjacent coil pieces among the plurality of coil pieces 10A to 10F. The heating state in which the magnetic flux is concentrated in the region S24 is set as the fourth heating state.

[0149] [Fourth Parameter]

[0150] Hereinafter, the parameter shown in Table 4 will be referred to as the fourth parameter. The controller 5 causes the current having the fourth parameter to flow through each of the coil pieces 10A to 10F, whereby it is possible to heat a prescribed portion of the heating target 80 more strongly than other portions in correspondence with the fourth parameter.

[0151] [Table 4]

[0152]

[0153] As shown in Table 4, in the fourth parameter, the currents flowing through the portions adjacent to each other have different amplitudes. In the fourth parameter, the currents flowing through the portions adjacent to each other have opposite phases (i.e., a phase difference of 180°). In the fourth parameter, the currents flowing through the portions adjacent to each other have relatively the same frequency.

[0154] The controller 5 controls the currents for all groups of the two adjacent coil pieces in a manner so as to become the fourth parameter shown in Table 4. For example, the controller 5 controls the currents in a manner in which the coil pieces with large amplitudes of the currents and the coil pieces with small amplitudes of the currents are alternately arranged. In addition, the controller 5 can change the region in which the magnetic flux is concentrated by changing the amplitudes of the currents flowing through the plurality of coil pieces 10A to 10F. The region in which the magnetic flux is concentrated is a region in the adjacent portions of the two adjacent coil pieces among the plurality of coil pieces 10A to 10F in which the coil piece with a large amplitude of the current flowing therethrough among the two adjacent coil pieces is disposed. In addition, the region in which the magnetic flux is concentrated can more strongly heat the heating target object 80 than the region in which the magnetic flux is not concentrated. That is, the controller 5 can change the heating state by changing the amplitudes of the currents flowing through the plurality of coil pieces 10A to 10F, respectively.

[0155] As an example of the heating state when the controller 5 controls the currents for all groups of the two adjacent coil pieces in a manner so as to become the fourth parameter, two examples (a fifth heating state and a sixth heating state) are described, respectively.

[0156] The fifth heating state is described.

[0157] Figure 12 is a schematic view that shows an example of the region in which the magnetic flux is concentrated in the fifth heating state of the induction heating cooker 1A of Embodiment 1 of the present disclosure.

[0158] In the fourth parameter, the controller 5 controls the currents in a manner in which the amplitudes of the currents flowing through the coil pieces 10A, 10C, and 10E are larger than the amplitudes of the currents flowing through the coil pieces 10B, 10D, and 10F. In the fourth parameter, the controller 5 controls the currents flowing through the respective coil pieces of the plurality of coil pieces 10A to 10F so that the frequency difference of the currents flowing through the two adjacent coil pieces becomes a frequency wave of twice the predetermined frequency. In the fourth parameter, as described above, the currents flowing through the plurality of coil pieces 10A to 10F are controlled by the controller 5, and thereby the magnetic flux is concentrated in the region S25. The heating state in which the magnetic flux is concentrated in the region S25 is set as the fifth heating state.

[0159] The sixth heating state is described.

[0160] Figure 13 is an example of the region in which the magnetic flux is concentrated in the sixth heating state of the induction heating cooker of Embodiment 1 of the present disclosure.

[0161] In the fourth parameter, the current is controlled in such a manner that the amplitude of the current flowing through the coil members 10B, 10D, and 10F is larger than the amplitude of the current flowing through the coil members 10A, 10C, and 10E. In the fourth parameter, the controller 5 controls the current flowing through each of the plurality of coil members 10A to 10F so that the frequency difference of the currents flowing through two adjacent coil members becomes a frequency wave of a frequency twice as large as that decided in advance. In the fourth parameter, as described above, the current flowing through the plurality of coil members 10A to 10F is controlled by the controller 5, whereby the magnetic flux is concentrated in the region S26. The heating state concentrated in the region S26 is set to a sixth heating state.

[0162] [Action]

[0163] An example of the action of the induction heating cooker 1A of the present disclosure will be described.

[0164] Figure 14 is a flowchart showing an example of a method of controlling the induction heating cooker 1A in the induction heating cooker 1A of Embodiment 1 of the present disclosure.

[0165] As shown in Figure 14 , the method of controlling the induction heating cooker 1A includes a step Step 1 of acquiring a cooking mode and a step Step 2 of switching a plurality of heating sequences H0.

[0166] First, in the step Step 1 of acquiring the cooking mode, the controller 5 acquires the cooking mode by inputting the cooking mode from the input-output interface device 8 to the controller 5, and reads out a plurality of procedures of the cooking mode from the storage device 52.

[0167] Next, in the step Step 2 of switching the plurality of heating sequences H0, the controller 5 switches the plurality of heating sequences H0 in accordance with the cooking mode read out in the step Step 1. For example, the controller 5 can acquire temperature information of the heating target object 80, and switch the plurality of heating sequences H0 on the basis of the temperature information of the heating target object 80. In addition, the controller 5 can acquire the temperature information of the heating target object 80 by the temperature sensor 6. Also, the controller 5 can switch the plurality of heating sequences H0 in accordance with the temperature of the heating target object 80 detected by the temperature sensor 6. Also, the controller 5 can switch the plurality of heating sequences H0 in accordance with the heating time of the heating target object 80 in the cooking mode.

[0168] The plurality of heating sequences H0 can each determine a prescribed order of switching the plurality of heating states in advance. For example, the plurality of heating sequences H0 can determine a prescribed order of switching the plurality of heating states in advance according to the cooking mode. In addition, at least one of the plurality of heating sequences H0 can include a first heating state and a second heating state that is different from the first heating state Pl in the local strength distribution of heating the heating target object 80. In addition, at least one of the plurality of heating sequences H0 can determine a prescribed order of switching the first heating state and the second heating state in advance. Also, the controller 5 can switch the first heating state and the second heating state based on the prescribed order determined by at least one of the plurality of heating sequences H0. For example, the controller 5 can switch the first heating state and the second heating state in the prescribed order based on the temperature of the heating target object 80 or the heating time of the heating target object 80. Specifically, the controller 5 can switch the first heating state and the second heating state in the prescribed order based on the temperature information of the heating target object 80 acquired by the temperature sensor 6.

[0169] The operation of the induction heating cooker 1A in the cooking mode will be described taking the first mode M1, the second mode M2, and the third mode M3 as examples.

[0170] An example of the operation of the induction heating cooker 1A in the first mode M1 of the present disclosure will be described.

[0171] Figure 15 is a graph showing an example of a curve representing the relationship between the heating time of the heating target object 80 and the temperature of the heating target object 80, an example of a curve representing the relationship between the heating time of the heating target object 80 and the oil temperature of the oil contained in the heating target object 80, and an example of a curve representing the relationship between the heating time of the heating target object 80 and the heating state in the first mode M1 of the induction heating cooker 1A of Embodiment 1 of the present disclosure.

[0172] When the first mode M1 and the target oil temperature K5 are input to the input-output interface device 8 by the user, the controller 5 reads out the plurality of processes of the first mode M1 from the storage device 52. For example, the controller 5 reads out the preheating process, the temperature adjustment process, and the load detection process.

[0173] Next, the controller 5 starts the preheating process. In the preheating process, the controller 5 heats the heating target object 80 until the temperature of the heating target object 80 reaches the first target temperature K1 (T1). The controller 5 controls at least a part of the parameters of the current flowing through each of the plurality of coil elements 10A to 10F according to the first heating sequence H1 including the first heating state Pl in the preheating process. In the present embodiment, it is assumed that the first heating sequence H1 includes only the first heating state Pl and will be described. For example, as shown in FIG. 6, the controller 5 controls the current flowing through each of the plurality of coil elements 10A to 10F according to the first heating sequence H1 including the first heating state Pl in the preheating process. Figure 8As shown, the first heating state P1 is a heating state in which the heating target object 80 on the region corresponding to the adjacent portions of the two adjacent coil members among the plurality of coil members 10A to 10F is heated more strongly than the heating target object 80 on the region corresponding to the portions along the first outer peripheral line L10 of the two adjacent coil members respectively. In the preheating process, the controller 5 heats the heating target object 80 through the first heating state P1 according to the first heating sequence H1.

[0174] In the preheating process, the controller 5 starts a temperature adjustment process as the next process when the temperature of the heating target object 80 reaches the first target temperature K1. In the temperature adjustment process, the controller 5 maintains the temperature of the heating target object 80 at a second target temperature K2. For example, in the preheating process, the controller 5 detects the temperature of the heating target object 80 by the temperature sensor 6, and maintains the temperature of the heating target object 80 at the second target temperature K2 by controlling the current flowing through the plurality of coil members 10A to 10F. In addition, the controller 5 maintains the temperature of the heating target object 80 at the second target temperature K2 by controlling the magnitude of the current flowing through the plurality of coil members 10A to 10F. Also, the controller 5 can control the magnitude of the current flowing through the plurality of coil members 10A to 10F according to the temperature difference between the temperature of the heating target object 80 detected by the temperature sensor 6 and the second target temperature K2, thereby maintaining the temperature of the heating target object 80 at the second target temperature K2.

[0175] In the temperature adjustment process, the controller 5 starts the load detection process when it detects that the food material 81 is further put into the heating target object 80 (T2). The controller 5 starts the load detection process when the temperature of the heating target object 80 changes from the second target temperature K2 to the threshold temperature K4 or less. That is, the controller 5 detects that the food material 81 is put in when the temperature of the heating target object 80 changes from the second target temperature K2 to the threshold temperature K4 or less, and switches the heating sequence to the second heating sequence H2.

[0176] In the load detection process, the controller 5 switches to the second heating sequence H2, and controls at least a part of the parameters of the current flowing through each of the plurality of coil members 10A to 10F according to the second heating sequence H2. In the load detection process, the controller 5 heats the heating target object 80 on which the food material 81 is put in by a larger power than the power by which the heating target object 80 is heated in the temperature adjustment process. For example, in the load detection process, the controller 5 can make the power larger than the power in the temperature adjustment process by making the magnitude of the current flowing through the coil members 10A to 10F larger than the magnitude of the current flowing through the coil members 10A to 10F in the temperature adjustment process. In addition, in the load detection process, the controller 5 can make a current larger than the magnitude of the current flowing through the coil members 10A to 10F in the temperature adjustment process flow through the coil members 10A to 10F.

[0177] The second heating sequence H2 in the load detection process includes a heating state different from the first heating sequence H1 in the temperature adjustment process. The second heating sequence H2 includes a first heating state P1 and a second heating state P2 in which the heating of the heating target 80 is distributed differently. For example, as shown in Figure 9 the second heating state P2 heats the heating target 80 in a region corresponding to a portion of the plurality of coil members 10A to 10F along the first outer peripheral line L10 more strongly than the heating target 80 in a region corresponding to a center of at least one of the plurality of coil members 10A to 10F. In the present embodiment, it is assumed that the second heating sequence H2 includes only the first heating state P1 and the second heating state P2 to be described.

[0178] The controller 5 switches the first heating state P1 and the second heating state P2 according to the second heating sequence H2. For example, the controller 5 switches the first heating state P1 and the second heating state P2 at a predetermined time interval decided in advance according to the second heating sequence H2.

[0179] In the load detection process, the controller 5 heats the heating target 80 to a third target temperature K3. For example, the third target temperature K3 can be a temperature at which the controller 5 maintains the oil contained in the heating target 80 at a target oil temperature K5 for the heating target 80 to which the food material 81 is further put in. The controller 5 can maintain the temperature of the heating target 80 at the third target temperature after the temperature of the heating target 80 reaches the third target temperature K3. In addition, the controller 5 can control the magnitude of the current flowing through the plurality of coil members 10A to 10F according to the temperature difference between the temperature of the heating target 80 detected by the temperature sensor 6 and the third target temperature K3, thereby maintaining the temperature of the heating target 80 at the third target temperature K3.

[0180] An example of the operation of the second mode M2 of the induction heating cooker 1A of the present disclosure will be described. Further, as an example of the operation of the second mode M2 of the induction heating cooker 1A of the present embodiment, an example of the operation of the second mode M2 will be described taking the "pork chop" as an example of the cooking recipe mode included in the second mode M2.

[0181] Figure 16 is a graph showing an example of a curve indicating the relationship between the heating time of the heating target 80 and the temperature of the heating target 80 detected by the temperature sensor 6 and a curve indicating an example of the relationship between the heating time of the heating target 80 and the heating state in the second mode M2 of the induction heating cooker 1A of the embodiment 1 of the present disclosure.

[0182] When one of the plurality of cooking recipe modes of the second mode M2 is input to the input-output interface device 8 by the user, the controller 5 reads out the plurality of processes of the input cooking recipe mode from the storage device 52. For example, when "pork cutlet" is input as the cooking recipe mode of the second mode M2, the controller 5 reads out the food material heating preparation process, the temperature adjustment process, the first searing process, and the second searing process.

[0183] The above-mentioned first searing process and the second searing process are processes including the searing processes of the second mode M2. The first searing process is a process of heating the heating target object 80 in a state where the first face of the food material 81 is in contact with the heating target object 80. For example, the first searing process is a process of heating in a state where one face of a pork slice is in contact with the heating target object 80 in the cooking process of "pork cutlet" as the cooking recipe mode of the second mode M2. The second searing process is a process of heating the heating target object 80 in a state where the second face of the food material 81 is in contact with the heating target object 80. For example, the second searing process is a process of heating in a state where the opposite face of the one face of the pork slice that was in contact with the heating target object 80 in the first searing process is in contact with the heating target object 80 in the cooking process of "pork cutlet" as the cooking recipe mode of the second mode M2.

[0184] Next, the controller 5 starts the food material heating preparation process. In the food material heating preparation process, the controller 5 heats the heating target object 80 until the temperature of the heating target object 80 reaches the first target temperature K11 (T11). In the food material heating preparation process, the controller 5 controls at least a part of the parameters of the current flowing through each of the plurality of coil pieces 10A to 10F in accordance with the first heating sequence H11. The first heating sequence H11 includes the first heating state P1. In the present embodiment, it is assumed that the first heating sequence H11 includes only the first heating state P1 and is described.

[0185] In the food material heating preparation process, the controller 5 starts the temperature adjustment process as the next process when the heating target object 80 reaches the first target temperature K11. In the temperature adjustment process, the controller 5 switches to the second heating sequence H12 and controls at least a part of the parameters of the current flowing through each of the plurality of coil members 10A to 10F. In the temperature adjustment process, the controller 5 maintains the temperature of the heating target object 80 at the first target temperature K11. For example, in the temperature adjustment process, the controller 5 controls the current flowing through the plurality of coil members 10A to 10F according to the second heating sequence H12, thereby maintaining the temperature of the heating target object 80 at the first target temperature K11. In addition, the controller 5 can maintain the temperature of the heating target object 80 at the first target temperature K11 by controlling the magnitude of the current flowing through the plurality of coil members 10A to 10F. Furthermore, the controller 5 can maintain the temperature of the heating target object 80 at the first target temperature K11 by controlling the magnitude of the current flowing through the plurality of coil members 10A to 10F according to the temperature difference between the temperature of the heating target object 80 detected by the temperature sensor 6 and the first target temperature K11.

[0186] The second heating sequence H12 includes the first heating state P1 and a second heating state P2 that is different from the first heating state P1 in the local strength distribution of heating the heating target object 80. In the present embodiment, it is assumed that the second heating sequence H12 includes only the first heating state P1 and the second heating state P2 and is described as such. In the temperature adjustment process, the controller 5 switches the heating state by the heating time of the heating target object 80 according to the second heating sequence H12. The controller 5 alternately switches the first heating state P1 and the second heating state P2 according to the second heating sequence H12.

[0187] Next, when it is detected that the food material 81 is further placed on the heating target object 80 (T12), the controller 5 starts the first roasting process. For example, the controller 5 can detect that the food material 81 is placed on the heating target object 80 by the temperature of the heating target object 80 decreasing from the first target temperature K11 due to the first surface of the food material 81 being in contact with the heating target object 80. In addition, the controller 5 can detect that the food material 81 is placed on the heating target object 80 when the temperature of the heating target object 80 decreases from the first target temperature K11 to a predetermined temperature. Furthermore, the controller 5 can detect that the food material 81 is further placed on the heating target object 80 by the user inputting to the input / output interface device 8 that the user has placed the food material 81.

[0188] In the first baking process, the controller 5 heats the heating target 80 with the target temperature of the temperature of the heating target 80 set to the first target temperature K11. In the first baking process, the controller 5 controls at least a part of the parameters of the current flowing through each of the plurality of coil members 10A to 10F in accordance with the second heating sequence H12. Thereby, in the first baking process, the controller 5 alternately switches the first heating state P1 and the second heating state P2 in accordance with the second heating sequence H12. In the first baking process, the controller 5 switches the heating state by the temperature of the heating target 80 and / or the heating time in accordance with the second heating sequence H12.

[0189] After the start of the first baking process, the temperature of the heating target 80 can be lower than the first target temperature K11 due to the placement of the food material 81. In the first baking process, when the temperature of the heating target 80 falls below the threshold temperature K12a (T13), the controller 5 changes the interval of the switching time of the heating state in accordance with the second heating sequence H12. Thereby, the temperature of the heating target 80 is suppressed from excessively falling. The threshold temperature K12a is a temperature lower than the first target temperature K11. The interval of the switching time of the heating state refers to the time interval in which the first heating state P1 and the second heating state P2 are alternately switched.

[0190] Specifically, the interval of the switching time of the heating state from the start of the first baking process (T12) to when the temperature of the heating target 80 falls below the threshold temperature K12a (T13) is relatively the same as the interval of the switching time of the heating state in the temperature adjustment process. In the first baking process, when the temperature of the heating target 80 becomes the threshold temperature K12a or lower (T13), the controller 5 extends the interval of the switching time of the first heating state P1 and the second heating state P2 in the second heating sequence H12. Thereby, the temperature of the heating target 80 is suppressed from excessively falling due to the placement of the food material 81. In addition, the controller 5 can further extend the interval of the switching time of the first heating state P1 and the second heating state P2 after extending the interval of the switching time of the first heating state P1 and the second heating state P2 in the second heating sequence H12, when the temperature of the heating target 80 does not rise (T14). The second heating sequence H12 can be completed when a predetermined time elapses from when the temperature of the heating target 80 falls to the threshold temperature K12a (T12) (T15).

[0191] Further, in the first roasting process, the controller 5 can heat the heating target object 80 with a different heating power from the heating power in the temperature adjustment process. The controller 5 can heat the heating target object 80 with a heating power larger than the heating power in the temperature adjustment process, or can heat the heating target object 80 with a smaller heating power. In addition, in the first roasting process, the controller 5 can control the current flowing through the plurality of coil members 10A to 10F so that the magnitude of the current flowing through the plurality of coil members 10A to 10F is different from the magnitude of the current flowing through each of the plurality of coil members 10A to 10F in the temperature adjustment process. For example, in the first roasting process, the controller 5 can adjust the magnitude of the current flowing through each of the plurality of coil members 10A to 10F in accordance with the temperature of the heating target object 80.

[0192] Next, the controller 5 starts the second roasting process after the first roasting process is completed. When the state in which the first surface of the food material 81 placed on the heating target object 80 is in contact with the heating target object 80 changes to a state in which the second surface of the food material 81 placed on the heating target object 80 is in contact with the heating target object 80 after the first roasting process is completed, the controller 5 starts the second roasting process. The controller 5 detects the state in which the second surface of the food material 81 is in contact with the heating target object 80 by the temperature of the heating target object 80 decreasing due to the second surface of the food material 81 being in contact with the heating target object 80. In addition, the controller 5 can detect the case in which the second surface of the food material 81 is in contact with the heating target object 80 by the user inputting information that the food material 81 is placed on the heating target object 80 to the input and output interface device 8.

[0193] In the second roasting process, the controller 5 heats the heating target object 80 with a second target temperature K12b different from the first target temperature K11 as a target temperature of the temperature of the heating target object 80.

[0194] In the present embodiment, the controller 5 heats the heating target object 80 with the second target temperature K12b set to be the same as the threshold temperature K12a of the first roasting process in the second roasting process.

[0195] In the second firing process, the controller 5 switches to a third heating sequence H13 according to which at least a part of the parameters of the current flowing through each of the plurality of coil members 10A to 10F is controlled. The third heating sequence H13 includes a heating state that is different from at least one of the heating states included in the second heating sequence H12 with respect to the local distribution of the heating of the heating target 80. The third heating sequence H13 includes the first heating state Pl, the second heating state P2, a third heating state P3 in which the local distribution of the heating of the heating target 80 is different from that in the first heating state Pl and the second heating state P2, and a fourth heating state P4. The fourth heating state P4 is different from the third heating state P3 with respect to the local distribution of the heating of the heating target 80. For example, as shown in FIG. 7, in the third heating state P3, the heating target 80 on the regions on which the coil members 10B, 10D, and 10F are arranged among the adjacent portions of the two adjacent coil members among the plurality of coil members 10A to 10F is heated more strongly. For example, as shown in FIG. 8, in the fourth heating state P4, the heating target 80 on the regions on which the coil members 10A, 10C, and 10E are arranged among the adjacent portions of the two adjacent coil members among the plurality of coil members 10A to 10F is heated more strongly. In the present embodiment, the third heating sequence H13 is described as including only the third heating state P3 and the fourth heating state P4. Figure 10 Figure 11

[0196] In the second firing process, the controller 5 switches the heating state according to the third heating sequence H13 to heat the heating target 80. In the second firing process, the controller 5 changes the interval of the switching time of the heating state according to the third heating sequence H13 by the temperature of the heating target 80 and / or the heating time when the temperature of the heating target 80 falls below a threshold temperature K13 (T16). Thus, the temperature of the heating target 80 is prevented from falling excessively. The threshold temperature K13 is a temperature lower than the second target temperature K12b. The interval of the switching time of the heating state refers to the interval of the time in which the third heating state P3 and the fourth heating state P4 are alternately switched.

[0197] After the start of the second firing process, the temperature of the heating target 80 is lower than the second target temperature K12b by the second surface of the food material 81 being in contact with the heating target 80. In the second firing process, the controller 5 changes the interval of the switching time of the heating state according to the third heating sequence H13 when the temperature of the heating target 80 falls below a threshold temperature K13 (T16). Thus, the temperature of the heating target 80 is prevented from falling excessively. The threshold temperature K13 is a temperature lower than the second target temperature K12b. The interval of the switching time of the heating state refers to the interval of the time in which the third heating state P3 and the fourth heating state P4 are alternately switched.

[0198] ​​Specifically, in the second baking process, when the temperature of the heating target 80 becomes the threshold temperature K13 or less (T16), the controller 5 extends the interval of the switching time of the third heating state P3 and the fourth heating state P4 in the third heating sequence H13. Thereby, the excessive decrease in the temperature of the heating target 80 due to the dropping of the food material 81 is suppressed. Further, the third heating sequence H13 can be completed when a prescribed time elapses from the heating time T16 (T17). In addition, the controller 5 can be controlled so as not to flow the electric current through the plurality of coil pieces 10A to 10F when the third heating sequence H13 is completed.

[0199] Further, in the second baking process, the controller 5 can heat the heating target 80 by a heating power different from the heating power in the temperature adjustment process. The controller 5 can heat the heating target 80 by a heating power larger than the heating power in the temperature adjustment process, or can heat the heating target 80 by a smaller heating power. In addition, in the first baking process, the controller 5 can be controlled so that the magnitude of the electric current flowing through the plurality of coil pieces 10A to 10F becomes different from the magnitude of the electric current flowing through each of the plurality of coil pieces 10A to 10F in the temperature adjustment process. For example, in the second baking process, the controller 5 can adjust the magnitude of the electric current flowing through each of the plurality of coil pieces 10A to 10F in accordance with the temperature of the heating target 80.

[0200] An example of the operation in the third mode M3 of the induction heating cooker 1A of the present disclosure will be described. Further, as an example of the operation in the third mode M3 of the induction heating cooker 1A of the present embodiment, an example in which the controller 5 is inputted with the cooking recipe mode of “curry” by the input / output interface device 8 will be described.

[0201] Figure 17 is a graph showing an example of a curve indicating the relationship between the heating time of the heating target 80 and the temperature of the heating target 80 detected by the temperature sensor 6 in the third mode M3 of the induction heating cooker 1A of the present embodiment 1, and a curve indicating an example of the relationship between the heating time of the heating target 80 and the heating state.

[0202] When one of the plurality of cooking recipe modes in the third mode M3 is inputted to the controller 5 by the user through the input / output interface device 8, the controller 5 reads out the plurality of processes of the inputted cooking recipe mode from the storage device 52. For example, when “curry” as the cooking recipe mode possessed by the third mode M3 is inputted as the cooking mode, the controller 5 reads out the first heating process and the second heating process.

[0203] Next, the controller 5 starts the first heating process. In the first heating process, the controller 5 heats the heating target 80 until the temperature of the heating target 80 reaches the target temperature K22. In the first heating process, the controller 5 controls at least a part of the parameters of the current flowing through each of the plurality of coil pieces 10A to 10F in accordance with the first heating sequence H21. In the first heating process, the controller 5 heats the heating target 80 in accordance with the first heating sequence H21. The first heating sequence H21 includes a first heating state P1 and a second heating state P2 different from the first heating state P1 in the local intensity distribution of heating of the heating target 80. In the present embodiment, it is assumed that the first heating sequence H21 includes only the first heating state P1 and the second heating state P2, and is described. The controller 5 switches the first heating state P1 and the second heating state P2 in accordance with the first heating sequence H21, and heats the heating target 80. The controller 5 can switch the heating state in accordance with the temperature of the heating target 80. In the first heating sequence H21, the controller 5 heats the heating target 80 in the first heating state P1 until the temperature of the heating target 80 reaches the threshold temperature K21 (T21). In addition, in the first heating sequence H21, the controller 5 alternately switches the first heating state P1 and the second heating state P2 during the time (T21-T22) from when the temperature of the heating target 80 reaches the threshold temperature K21 (T21) to when the target temperature K22 (T22) is reached, and thereby heats the heating target 80.

[0204] Next, when the heating target 80 reaches the target temperature K22, the controller 5 starts the second heating process as the next process. In the second heating process, the controller 5 maintains the temperature of the heating target 80 at the target temperature K22. In the second heating process, the controller 5 switches to the second heating sequence H22, and controls at least a part of the parameters of the current flowing through each of the plurality of coil pieces 10A to 10F in accordance with the second heating sequence H22. The second heating sequence H22 includes a third heating state P3, a fourth heating state P4, a fifth heating state P5, and a sixth heating state P6. The third heating state P3, the fourth heating state P4, the fifth heating state P5, and the sixth heating state P6 are different from each other in the local intensity distribution of heating of the heating target 80. For example, as shown in FIG. 6, the fifth heating state P5 intensively heats the heating target 80 in the region in which the coil pieces 10A, 10C, and 10E are arranged in the portion along the first outer peripheral line L10 of the plurality of coil pieces 10A to 10F. For example, as shown in FIG. 7, the sixth heating state P6 intensively heats the heating target 80 in the region in which the coil pieces 10B and 10D are arranged in the portion along the second outer peripheral line L20 of the plurality of coil pieces 10A to 10F. Figure 12 Figure 13 ​As shown, the sixth heating state P6 causes the heating target 80 on the region in which the coil members 10B, 10D, and 10F are arranged in the portions along the first outer peripheral line L10 of the plurality of coil members 10A to 10F to be heated intensively. In the present embodiment, it is assumed that the second heating sequence H22 includes only the third heating state P3, the fourth heating state P4, the fifth heating state P5, and the sixth heating state P6.

[0205] In the second heating process, the controller 5 switches the third heating state P3, the fourth heating state P4, the fifth heating state P5, and the sixth heating state P6 in accordance with the second heating sequence H22. In the second heating process, the controller 5 switches the heating state in accordance with the heating time of the heating target 80. In addition, in the switching of the heating state corresponding to the second heating sequence H22, the range of the region in which the magnetic flux is concentrated is relatively different between the heating state before the switching and the heating state after the switching. For example, when the heating state is switched from the heating state in which the magnetic flux is concentrated in at least a portion of the adjacent portions of the adjacent two coil members, the heating state after the switching is the heating state in which the magnetic flux is concentrated in at least a portion of the portions along the first outer peripheral line L10.

[0206] The heating state in which the magnetic flux is concentrated in at least a portion of the adjacent portions of the adjacent two coil members can be the heating state in which the magnetic flux is concentrated in the portions as shown in Figure 8 , Figure 10 and Figure 11 In the explanation of the third mode M3 of the present embodiment, the heating state in which the magnetic flux is concentrated in at least a portion of the adjacent portions of the adjacent two coil members refers to the third heating state P3 and the fourth heating state P4 as shown in Figure 10 and Figure 11 As shown in Figure 10 and Figure 11 , the third heating state P3 and the fourth heating state P4 are each the heating state in which the magnetic flux is concentrated in at least a portion of the adjacent portions of the adjacent two coil members. That is, the range of the region in which the magnetic flux is concentrated in the third heating state P3 and the fourth heating state P4 is the adjacent portions of the adjacent two coil members.

[0207] The heating state in which the magnetic flux is concentrated in at least a portion of the portions along the first outer peripheral line L10 can be the heating state in which the magnetic flux is concentrated in the portions as shown in Figure 9 , Figure 12 and Figure 13 In the explanation of the third mode M3 of the present embodiment, the heating state in which the magnetic flux is concentrated in at least a portion of the portions along the first outer peripheral line L10 refers to the fifth heating state P5 and the sixth heating state P6 as shown in Figure 12 and Figure 13 As shown in Figure 12 and Figure 13As shown, the fifth heating state P5 and the sixth heating state P6 are each a heating state in which the magnetic flux is concentrated in at least a portion of the site along the first outer periphery line L10. That is, the range of the region in which the magnetic flux is concentrated in the fifth heating state P5 and the sixth heating state P6 is the site along the first outer periphery line L10.

[0208] In the second heating process, the controller 5 switches the heating state in the order of the third heating state P3, the fifth heating state P5, the fourth heating state P4, and the sixth heating state P6 from the start of the second heating process (T22) to the elapse of the predetermined heating time (T23). The controller 5 performs the switching of each heating state from the heating time T22 to the heating time T23 at intervals of relatively equal switching times of the heating states.

[0209] In the second heating process, the controller 5 switches the heating state in the order of the third heating state P3, the sixth heating state P6, the fourth heating state P4, and the fifth heating state P5 from the heating time T23 to the elapse of the predetermined heating time (T24). The controller 5 performs the switching of each heating state from the heating time T23 to the heating time T24 at intervals of relatively equal switching times of the heating states. The intervals of the switching times of the heating states from the heating time T23 to the heating time T24 can be relatively the same as the intervals of the switching times of the heating states from the heating time T22 to the heating time T23. The second heating sequence H22 can be completed when the heating time of the heating target object 80 elapses a prescribed time (T24). In addition, when the second heating sequence H22 is completed, the controller 5 can be controlled not to flow the current through the plurality of coil pieces 10A to 10F.

[0210] The induction heating cooker 1A according to Embodiment 1 of the present disclosure can achieve the following effects.

[0211] The induction heating cooker 1A includes a top plate 2, a coil unit 4A, and a controller 5. The coil unit 4A is disposed below the top plate 2. The controller 5 controls heating of the heating target object 80 by the coil unit 4A. The coil unit 4A includes a plurality of coil pieces 10A to 10F disposed in a first heating region SO that heats the heating target object 80 in plan view (X-Y plane). The first heating region SO has a plurality of first coil arrangement regions S1 to S6, which are demarcated by a first outer periphery line L10 demarcating an outer periphery of the first heating region SO and a plurality of first boundary lines L1 to L6 extending radially from a center Cl of the first heating region SO toward the outer periphery in plan view. The plurality of coil pieces 10A to 10F are disposed in the plurality of first coil arrangement regions S1 to S6 in plan view. The controller 5 switches a plurality of heating states P1 to P6 in which the local intensity distribution of heating of the heating target object 80 is different, by flowing a current through all of the plurality of coil pieces 10A to 10F while controlling at least a part of the parameters of the current flowing through each of the plurality of coil pieces 10A to 10F. The controller 5 has a plurality of heating sequences H0 in which one or more of the plurality of heating states P1 to P6 are combined. The controller 5 acquires a cooking mode and switches the plurality of heating sequences H0 according to the acquired cooking mode.

[0212] According to such a configuration, the induction heating cooker 1A can efficiently heat the heating target object 80. The controller 5 of the induction heating cooker 1A switches the plurality of heating sequences H0 according to the cooking mode, whereby the induction heating cooker 1A can efficiently heat the heating target object 80 according to the cooking method of the food material 81. In addition, by the coil unit 4A including the plurality of coil pieces 10A to 10F, the controller 5 can adjust the local intensity distribution of heating of the heating target object 80 in a fine distribution. The first heating region SO is divided into the plurality of coil arrangement regions S1 to S6 by the plurality of boundary lines L1 to L6 and the first outer periphery line L10. In the plurality of coil arrangement regions S1 to S6, the coil wire 11 constituting the coil pieces 10A to 10F is disposed along two adjacent boundary lines and the first outer periphery line L10 connecting the two adjacent boundary lines. Thus, the coil wire 11 of the plurality of coil pieces 10A to 10F is disposed from the center Cl of the first heating region SO toward the outer periphery in plan view, and therefore the induction heating cooker 1A can reduce heating unevenness. In addition, the gap between each of the plurality of coil pieces 10A to 10F can be reduced, and the deviation of the gap can be reduced. That is, the induction heating cooker 1A switches the plurality of heating sequences H0 according to the cooking mode, whereby even in a process of flowing a large amount of power through the plurality of coil pieces 10A to 10F, the temperature difference of the local heating of the heating target object 80 can be relatively small.

[0213] The controller 5 acquires temperature information of the heating target object 80 and switches the plurality of heating sequences H0 based on the temperature information of the heating target object 80.

[0214] According to such a configuration, the induction heating cooker 1A can make a temperature difference in heating of the heating target object 80 relatively small. By switching the distribution of the local intensity of heating of the heating target object 80, the temperature difference in heating of the heating target object 80 becomes relatively small. In addition, by alternately switching the first heating state P1 and the second heating state P2, which differ in the distribution of the local intensity of heating of the heating target object 80, in accordance with the temperature information of the heating target object 80, the local temperature difference of the heating target object 80 can be reduced. By reducing the local temperature difference of the heating target object 80, the induction heating cooker 1A can perform relatively uniform heating of the heating target object 80.

[0215] At least one of the plurality of heating sequences H0 includes the first heating state P1 and a second heating state P2 that differs from the first heating state P1 in the distribution of the local intensity of heating of the heating target object 80. At least one of the plurality of heating sequences H0 can determine a prescribed order of switching the first heating state P1 and the second heating state P2 in advance. The controller 5 can also switch the first heating state P1 and the second heating state P2 based on the prescribed order determined by at least one of the plurality of heating sequences H0.

[0216] According to such a configuration, the induction heating cooker 1A can more efficiently heat the heating target object 80. According to at least one of the plurality of heating sequences H0, the controller 5 switches the first heating state P1 and the second heating state P2 to heat the heating target object 80, whereby the local temperature difference of the heating distribution of the heating target object 80 can be made relatively small. The induction heating cooker 1A can more efficiently heat the heating target object 80 by making the local temperature difference of the heating distribution of the heating target object 80 relatively small.

[0217] The controller 5 switches the first heating state P1 and the second heating state P2 in the prescribed order based on the temperature of the heating target object 80 or the heating time of the heating target object 80.

[0218] According to such a configuration, the induction heating cooker 1A can more efficiently heat the heating target object 80. In addition, the controller 5 switches the first heating state P1 and the second heating state P2 based on the temperature of the heating target object 80, whereby the heating target object 80 can be heated in relatively the same manner as a predetermined temperature even in a case where the temperature variation of the heating target object 80 caused by the material of the heating target object 80 or the food material 81 housed in the heating target object 80 differs. In addition, the controller 5 can make the local temperature difference of the heating target object 80 relatively small by heating in the first heating state P1 and the second heating state P2 based on the heating time.

[0219] The cooking mode includes a first mode M1 in which deep-frying cooking is performed. The first mode M1 includes a preheating process, a temperature adjustment process, and a load detection process. The preheating process is a process of heating the heating target object 80 until the temperature of the heating target object 80 reaches a first target temperature K1. The temperature adjustment process is a process of maintaining the temperature of the heating target object 80 at a second target temperature K2 after the preheating process is completed. The load detection process is a process of heating the heating target object 80 to which the food material 81 is put, using a larger heating power than the heating power used in the temperature adjustment process, when it is detected that the food material 81 is put into the heating target object 80. The controller 5 switches the plurality of heating sequences H0 in accordance with the plurality of processes of the first mode M1.

[0220] According to such a configuration, the induction heating cooker 1A can efficiently heat the heating target object 80 on the basis of performing deep-frying cooking. In addition, the induction heating cooker 1A can deep-fry the food material 81 by the target oil temperature K5 decided in advance. Furthermore, the induction heating cooker 1A heats the heating target object 80 using a larger heating power than the heating power used in the temperature adjustment process in the load detection process, and thus can relatively quickly return the temperature of the oil accommodated in the heating target object 80, which has decreased due to the food material 81 being put in, to the target oil temperature K5. The controller 5 can make the local temperature difference of the heating target object 80 relatively small by switching the plurality of heating sequences H0 in accordance with the plurality of processes.

[0221] The controller 5 controls at least a part of the parameters of the current flowing through each of the plurality of coil members 10A to 10F in accordance with the first heating sequence H1 including the first heating state P1 in the preheating process of the first mode M1. The controller 5 controls at least a part of the parameters of the current flowing through each of the plurality of coil members 10A to 10F in accordance with the second heating sequence H2 including the first heating state P1 and a second heating state P2 different from the first heating state P1 in the local strength distribution of heating the heating target object 80 in the load detection process of the first mode M1. The controller 5 switches the first heating state P1 and the second heating state P2 in the second heating sequence H2.

[0222] According to such a configuration, the induction heating cooker 1A can more efficiently heat the heating target 80 on the basis of deep-frying cooking. By changing the plurality of heating sequences H0 corresponding to the respective plurality of processes in the first mode M1, the heating target 80 can be heated in the heating state P1, P2 corresponding to the process. In addition, in the preheating process, the heating target 80 is heated according to the first heating sequence H1 including the first heating state P1, whereby the controller 5 can efficiently cause the temperature of the heating target 80 to reach the first target temperature K1. Also, in the load detection process, the heating target 80 is heated corresponding to the second heating sequence H2 including the first heating state P1 and the second heating state P2, whereby the temperature difference in the local part of the heating distribution of the heating target 80 can be relatively small. By making the temperature difference in the local part of the heating distribution of the heating target 80 relatively small, it is possible to suppress scorching due to the food material 81 coming into contact with the part of the heating target 80 that becomes high temperature.

[0223] In the first mode M1, the controller 5 switches the first heating state P1 and the second heating state P2 at a predetermined time interval decided in advance according to the second heating sequence H2.

[0224] The induction heating cooker 1A, in the first mode M1, can make the temperature difference in the local part of the heating distribution of the heating target 80 relatively small by switching the heating state at a predetermined time interval decided in advance. The induction heating cooker 1A, by making the temperature difference in the local part of the heating distribution of the heating target 80 relatively small, can more efficiently heat the heating target 80.

[0225] In the first mode M1, the first heating state P1 heats the heating target 80 in the area corresponding to the adjacent parts of the two adjacent coil members among the plurality of coil members 10A to 10F more strongly than the heating target 80 in the area corresponding to the parts along the first outer peripheral line L10 of the two adjacent coil members respectively. The second heating state P2 heats the heating target 80 in the area corresponding to the parts along the first outer peripheral line L10 of the plurality of coil members 10A to 10F more strongly than the heating target 80 in the area corresponding to the center of at least one of the plurality of coil members 10A to 10F. The controller 5 switches the first heating state P1 and the second heating state P2 in the second heating sequence H2.

[0226] In the first heating state P1, by heating the heating target object 80, the induction heating cooker 1A is able to more efficiently heat the heating target object 80 on the region corresponding to the adjacent portions of the two adjacent coil members among the plurality of coil members 10A to 10F. In the second heating state P2, by heating the heating target object 80, the induction heating cooker 1A is able to more efficiently heat the heating target object 80 on the region corresponding to the portions of the plurality of coil members 10A to 10F along the first outer peripheral line L10. The controller 5 is able to reduce the heating unevenness of the heating target object 80 by switching the first heating state P1 and the second heating state P2 in the second heating sequence H2. The controller 5 is able to make the local temperature difference of the heating target object 80 relatively small even in the process of causing large power to flow through the plurality of coil members 10A to 10F by switching the first heating state P1 and the second heating state P2 in the second heating sequence H2.

[0227] The cooking mode includes a second mode M2 in which grilled food is cooked. The second mode M2 can have a food heating preparation process, a temperature adjustment process, and a grilling process. The food heating preparation process is a process of heating the heating target object 80 to a temperature at which the heating target object 80 reaches the first target temperature K11. The temperature adjustment process is a process of maintaining the temperature of the heating target object 80 at the first target temperature K11 after the food heating preparation process is completed. The grilling process is a process of heating the heating target object 80 using a different heating power from the heating power used to heat the heating target object 80 in the temperature adjustment process when it is detected that food 81 is placed on the heating target object 80. The controller 5 can switch a plurality of heating sequences H0 according to a plurality of processes of the second mode M2.

[0228] According to such a structure, the induction heating cooker 1A is able to efficiently heat the heating target object 80 on the basis of cooking grilled food. By the controller 5 switching the plurality of heating sequences H0 according to the plurality of processes of the second mode M2, the heating target object 80 is able to be heated in the heating state corresponding to the plurality of processes.

[0229] The controller 5 controls at least a part of the parameters of the current flowing through each of the plurality of coil members 10A to 10F according to the first heating sequence H11 including the first heating state P1 in the food heating preparation process of the second mode M2. The controller 5 controls at least a part of the parameters of the current flowing through each of the plurality of coil members 10A to 10F according to the second heating sequence H12 in the grilling process of the second mode M2. The second heating sequence H12 includes the first heating state P1 and a second heating state P2 in which the local strength distribution of the heating of the heating target object 80 is different from the first heating state P1. The controller 5 alternately switches the first heating state P1 and the second heating state P2 in the second heating sequence H12.

[0230] According to such a structure, the induction heating cooker 1A is able to efficiently heat the heating target object 80 on the basis of performing the grilling object cooking. By the controller 5 switching the heating state according to the heating sequence in each of the plurality of processes in the second mode M2, the heating target object 80 is able to be efficiently heated.

[0231] The grilling processes in the second mode M2 include a first grilling process and a second grilling process. The first grilling process is a process of heating the heating target object 80 in a state in which the first face of the food material 81 having the first face and the second face opposite to the first face is in contact with the heating target object 80. The second grilling process is a process of heating the heating target object 80 in a state in which the heating target object 80 is in contact with the second face of the food material 81 after the first grilling process is completed. The controller 5 controls at least a part of the parameters of the current flowing through each of the plurality of coil members 10A to 10F according to the first heating sequence H11 including the first heating state P1 in the food material heating preparation process. The controller 5 controls at least a part of the parameters of the current flowing through each of the plurality of coil members 10A to 10F according to the second heating sequence H12 including the first heating state P1 and the second heating state P2 different from the first heating state P1 in the local intensity distribution of heating the heating target object 80 in the first grilling process. The controller 5 controls at least a part of the parameters of the current flowing through each of the plurality of coil members 10A to 10F according to the third heating sequence H13 including at least one heating state different from the heating state included in the second heating sequence H12 in the local intensity distribution of heating the heating target object 80 in the second grilling process.

[0232] According to such a structure, the induction heating cooker 1A is able to more efficiently cook the food material 81 having the first face and the second face. By switching the heating sequence in the first grilling process and the second grilling process, it is possible to respectively heat and cook the food material 81 having the first face and the second face in an appropriate heating state in each process. The appropriate heating state differs depending on the cooking recipe. Further, the appropriate heating state in the stage of heating and cooking the food material 81 refers to the local intensity distribution of heating the heating target object 80, which is relatively uniform in the intensity distribution of heating the food material 81. For example, in the "pork chop" as the cooking recipe mode, the appropriate heating state is to make the pork have uniform grill marks, which is the local intensity distribution of heating the heating target object 80.

[0233] The cooking mode can also include a third mode M3 for performing cooking. The third mode M3 has a first heating process and a second heating process. The first heating process is a process of heating the heating target object 80 until the temperature of the heating target object 80 reaches the target temperature K22. The second heating process is a process of maintaining the temperature of the heating target object 80 at the target temperature K22 after the first heating process is completed. The controller 5 switches the plurality of heating sequences H0 in accordance with the plurality of processes of the third mode M3.

[0234] According to such a configuration, the induction heating cooker 1A can efficiently heat the heating target object 80 on the basis of performing cooking. By the controller 5 switching the plurality of heating sequences H0 in accordance with the plurality of processes of the third mode M3, the heating target object 80 can be heated in the heating state corresponding to each process.

[0235] The controller 5 controls at least a part of the parameters of the current flowing through each of the plurality of coil members 10A to 10F in accordance with the first heating sequence H21 including the first heating state P1 in the first heating process of the third mode M3. The controller 5 controls at least a part of the parameters of the current flowing through each of the plurality of coil members 10A to 10F in accordance with the second heating sequence H22 in the second heating process of the third mode M3. The second heating sequence H22 includes a third heating state P3 different from the first heating state P1 in the distribution of heating the heating target object 80 and a fifth heating state P5 different from the third heating state P3 in the distribution of heating the heating target object 80. In the second heating sequence H22, the controller 5 switches the third heating state P3 and the fifth heating state P5.

[0236] According to such a configuration, the induction heating cooker 1A can efficiently heat the heating target object 80. The controller 5 of the induction heating cooker 1A switches the plurality of heating sequences H0 in accordance with the cooking mode, whereby the heating target object 80 can be efficiently heated in accordance with the cooking method of the food material 81. In addition, the controller 5 can adjust the local intensity distribution of heating the heating target object 80 with a relatively fine distribution by controlling at least a part of the parameters of the current flowing through each of the plurality of coil members 10A to 10F. The controller 5 can adjust the local intensity distribution of heating the heating target object 80 with a relatively fine distribution, whereby the heating unevenness of the heating target object 80 can be adjusted relatively finely. That is, the induction heating cooker 1A can reduce the heating unevenness of heating the heating target object 80 by the controller 5 switching the plurality of heating states.

[0237] When the heating target 80 is heated, the liquid food material 81 accommodated in the heating target 80 changes in fluid density with a change in temperature, and flows when rising or falling. That is, when the heating target 80 is heated, the liquid food material 81 accommodated in the heating target 80 generates convection. The convection of the liquid food material 81 accommodated in the heating target 80 changes depending on a change in the local distribution of heating of the heating target 80. Therefore, the convection can be changed by switching the heating state. The change in the convection of the liquid food material 81 accommodated in the heating target 80 can effectively promote the movement of moisture based on the osmotic pressure generated between the solid food material 81 and the liquid food material 81. That is, the controller 5 can cause the movement of moisture based on the osmotic pressure generated between the solid food material 81 and the liquid food material 81 to efficiently proceed by alternately switching the second heating state P2 and the third heating state P3. That is, according to such a structure, the induction heating cooker 1A can further penetrate the solid food material 81 with the flavor in cooking.

[0238] The method of controlling the induction heating cooker 1A is a method of controlling the induction heating cooker 1A by the controller 5. The induction heating cooker 1A includes the top plate 2 and the coil unit 4A disposed below the top plate 2. The coil unit 4A includes a plurality of coil pieces 10A to 10F disposed in a first heating region S0 that heats the heating target 80 in plan view. The first heating region S0 has a plurality of first coil arrangement regions S1 to S6 demarcated by a first outer periphery line L10 demarcating an outer periphery of the first heating region S0 and a plurality of first boundary lines L1 to L6 extending radially from a center C1 of the first heating region S0 toward the outer periphery in plan view. The plurality of coil pieces 10A to 10F are disposed within the plurality of first coil arrangement regions S1 to S6 in plan view. The induction heating cooker 1A controls at least a part of parameters of the current flowing through each of the plurality of coil pieces 10A to 10F while causing the current to flow through all of the plurality of coil pieces 10A to 10F. The induction heating cooker 1A can switch a plurality of heating states P1 to P6 in which the local intensity distribution of heating of the heating target 80 is different by controlling at least a part of the parameters of the current flowing through each of the plurality of coil pieces 10A to 10F. The plurality of heating states are switched according to each of a plurality of heating sequences H0 in which one or more of the plurality of heating states P1 to P6 are combined. The method of controlling the induction heating cooker 1A includes a step of acquiring a cooking mode (Step 1) and a step of switching the plurality of heating sequences H0 according to the cooking mode (Step 2).

[0239] According to such a configuration, the induction heating cooker 1A can efficiently heat the heating target object 80. The controller 5 of the induction heating cooker 1A switches the plurality of heating sequences H0 according to the cooking mode, whereby the induction heating cooker 1A can efficiently heat the heating target object 80 according to the cooking method of the food material 81.

[0240] In addition, in the present embodiment, a case where the induction heating cooker 1A has the controller 5 is described, but the induction heating cooker 1A can not have the controller 5. For example, the controller 5 can be independent of the induction heating cooker 1A. Further, the induction heating cooker 1A can be controlled by the independent controller 5. The controller 5 can have a first communication section that receives information from the induction heating cooker 1A. The induction heating cooker 1A can have a second communication section that receives an operation instruction from the controller 5. By causing the first communication section and the second communication section to communicate with each other, the induction heating cooker 1A can be controlled by the controller 5. For example, the first communication section and the second communication section can communicate with each other via a network. In addition, the first communication section and the second communication section can include a circuit that communicates in accordance with a prescribed communication standard (for example, LAN, Wi-Fi (registered trademark), Bluetooth (registered trademark)).

[0241] Further, a case where the plurality of coil units 4A, the controller 5, the plurality of temperature sensors 6, and the input / output interface device 8 are mounted in the housing 3 is described, but is not limited thereto. For example, the plurality of coil units 4A, the controller 5, the plurality of temperature sensors 6, and the input / output interface device 8 can not be mounted in the housing 3.

[0242] In addition, an example of the induction heating cooker 1A having the plurality of coil units 4A is described, but the induction heating cooker 1A can not have the plurality of coil units 4A. For example, the induction heating cooker 1A can have only one coil unit 4A.

[0243] Further, an example where the plurality of coil units 4A have the plurality of coil pieces 10A to 10F disposed in the first heating region S0 that heats the heating target object 80 is described, but is not limited thereto. For example, one of the plurality of coil units 4A can be a coil unit that does not have the plurality of coil pieces 10A to 10F disposed in the first heating region S0 that heats the heating target object 80. In addition, one of the plurality of coil units 4A can be a coil piece disposed in the first heating region S0.

[0244] In addition, the example of the induction heating cooker 1A having the plurality of temperature sensors 6 is described, but the induction heating cooker 1A can not have the plurality of temperature sensors 6. For example, the temperature sensor 6 can be provided to a device independent of the induction heating cooker 1A to detect the temperature of the heating target object 80, and output the detected temperature of the heating target object 80 to the controller 5.

[0245] Further, the example in which the penetration window 7 is provided to the top plate 2 is described, but the penetration window 7 can not be provided to the top plate 2.

[0246] In addition, the example of the induction heating cooker 1A having the input / output interface device 8 is described, but the induction heating cooker 1A can not have the input / output interface device 8. For example, the induction heating cooker 1A can not have the input / output interface device 8, and heat the heating target object 80 in only one cooking mode by turning on / off the power supply. Further, the induction heating cooker 1A can heat the heating target object 80 by only the first mode M1. Also, the induction heating cooker 1A can heat the heating target object 80 by only the first mode M1 in which one target oil temperature is set. Specifically, the induction heating cooker 1A can control in only the first mode M1 in which the target oil temperature K5 is set to the oil temperature 180° in advance.

[0247] In addition, the example in which the first heating region S0 can be formed in a circular shape in the X-Y plane is described, but is not limited thereto. The first heating region S0 is not limited to the example in which the first heating region S0 is circular in the X-Y plane. For example, the first heating region S0 can be circular, rectangular, elliptical, or a regular polygon in the X-Y plane. In addition, in a case where the first heating region S0 is rectangular in the X-Y plane, the center Cl of the first heating region S0 can be the intersection of the diagonal lines. Also, in a case where the first heating region S0 is elliptical in the X-Y plane, the center Cl of the first heating region S0 can be the intersection of the major axis and the minor axis. Further, in a case where the first heating region S0 is a regular polygon in the X-Y plane, the center Cl of the first heating region S0 can be the center of a circle that is tangent to all the outer sides constituting the regular polygon.

[0248] Further, the circuit in the present embodiment is shown in Figure 5 and described, but is not limited thereto, and various circuits can be used.

[0249] Further, the controller 5 can heat the heating target object 80 in the heating state by switching the parameters of the plurality of currents. For example, the controller 5 can alternately switch using the parameters of two kinds of currents, or can switch in a manner in which the parameters of the two kinds of currents are alternately continuously or stepwise changed.

[0250] In addition, the first to sixth heating states P1 to P6 are described as examples of the heating state of the local strength distribution of the heating of the heating target 80, but the heating state is not limited to the first to sixth heating states P1 to P6. For example, depending on the number of types of amplitudes, the difference in frequency, and the difference in phase, it can be a heating state different from the first to sixth heating states. In addition, the relationship of the parameters of the currents adjacent to each other can be different in each of the plurality of coil members 10A to 10F. Furthermore, the relationship of the parameters of the currents adjacent to each other can be different in the opposing coil members (for example, the coil member 10A and the coil member 10D).

[0251] Furthermore, the example in which the controller 5 uses the amplitudes of the two kinds of currents to change the strength of the heating intensity is described, but it is not limited thereto. For example, the controller 5 can use the amplitudes of two or more kinds of currents to change the strength of two or more kinds of heating intensities.

[0252] Furthermore, in the present embodiment, the heating state is classified according to the relationship of the parameters of the currents flowing through the plurality of coil members 10A to 10F, but this is a classification for simplifying the description, and is not a classification of the heating state. For example, the heating state can be determined according to the difference in the amplitude of the current of each of the plurality of coil members 10A to 10F. In addition, the heating state can also be classified according to the difference in the region of the magnetic flux concentration.

[0253] Furthermore, the example in which the parameters of the currents are the first to fourth parameters is described, but the parameters of the currents can not be the first to fourth parameters. For example, the parameters of the currents can be the fifth and sixth parameters described later.

[0254] [Fifth Parameter]

[0255] Hereinafter, the parameters shown in Table 5 will be referred to as the fifth parameters. The controller 5 causes the currents having the fifth parameters to flow through each of the coil members 10A to 10F, whereby the heating target 80 can heat the prescribed portion more strongly than other portions in correspondence with the fifth parameters.

[0256] [Table 5]

[0257]

[0258] As shown in Table 5, in the fifth parameter, the currents flowing at the positions adjacent to each other have relatively equal amplitudes. In the fifth parameter, the currents flowing at the positions adjacent to each other have different phases. Specifically, in the fifth parameter, the currents flowing at the positions adjacent to each other have equal phase differences for all groups of the two coil members adjacent to each other. For example, the equal phase difference is 60°, but is not limited thereto. In the fifth parameter, the currents flowing at the positions adjacent to each other have relatively the same frequency. The controller 5 is able to change the heating state by controlling the currents for all groups of the two coil members adjacent to each other in the manner of the fifth parameter shown in Table 5.

[0259] The controller 5 controls the currents for all groups of the two coil members adjacent to each other in the manner of the fifth parameter, whereby the induction heating cooker 1A is able to heat the inner side portion of the heating target object 80 more strongly than the outer side portion of the heating target object 80. Compared to the case where the controller 5 controls the currents for all groups of the two coil members adjacent to each other in the manner of the first parameter, controlling the currents in the manner of the fifth parameter more strongly heats the inner side portion of the heating target object 80 in a wider range.

[0260] [Sixth Parameter]

[0261] The parameters of the currents controlled by the controller 5 are not limited to the first to fifth parameters. The controller 5 is able to control the heating of the heating target object 80 by a heating state different from the heating state under the first to fifth parameters by controlling the parameters of the currents flowing at the positions adjacent to each other in the two coil members to be different from the first to fifth parameters. For example, the controller 5 is able to control in a manner such that the currents having the parameters shown in Table 6 flow through the plurality of coil members 10A to 10F, respectively. Hereinafter, the parameters shown in Table 6 are appropriately referred to as a sixth parameter.

[0262] [Table 6]

[0263]

[0264] As shown in Table 6, in the sixth parameter, the currents flowing at the positions adjacent to each other have different amplitudes. In the sixth parameter, the currents flowing at the positions adjacent to each other have relatively the same phase (i.e., a phase difference of 0°). In the sixth parameter, the currents flowing at the positions adjacent to each other have different frequencies. The sixth parameter is different from the first parameter in that the amplitudes and the frequencies of the currents are not equal. According to this difference, the controller 5 controls in a manner such that the currents flowing in the plurality of coil members 10A to 10F, respectively, have the sixth parameter, whereby it is able to change the strength of the heating based on the positions adjacent to each other.

[0265] For example, when the amplitude of the current flowing in a prescribed coil member is reduced, the controller 5 can make the heating intensity of the area heated by the prescribed coil member weaker than the intensity of the area heated by the other coil members. The area heated by the prescribed coil member includes an area heated by the parts adjacent to each other between the prescribed coil member and the coil members adjacent to the prescribed coil member.

[0266] For example, the controller 5 can control in such a manner that the frequency of the current flowing through one of the two adjacent coil members becomes twice the frequency of the current flowing through the other (i.e., a frequency difference of one time). The prescribed frequency difference is not limited to one time, and can be an integer times of 0 or more. The controller 5 can change the heating state by changing the amplitudes and frequencies of the currents flowing through the plurality of coil members 10A to 10F, respectively.

[0267] Further, although it is described that the controller 5 acquires the temperature information of the heating target 80 by the temperature sensor 6, the present application is not limited thereto. For example, the controller 5 can acquire the temperature change of the heating target 80 by the change in the impedance of each of the plurality of coil members 10A to 10F. When the coil unit 4A heats the heating target 80, the magnetic field generated by each of the plurality of coil members 10A to 10F affects the heating target 80, and a current is generated in the heating target 80, whereby the heating target 80 is heated. The magnetic field is affected by the heating target 80, and thus the impedance of each of the plurality of coil members 10A to 10F changes. Generally, the impedance of each of the plurality of coil members 10A to 10F changes depending on whether or not the heating target 80 is placed in the range affected by the magnetic field generated by each of the plurality of coil members 10A to 10F, and the magnetic properties based on the material thereof. The impedance also changes depending on the temperature of the heating target 80, and thus the controller 5 can acquire the temperature change of the heating target 80 by grasping the change in the impedance of each of the plurality of coil members 10A to 10F, and so on, and acquiring the change in the characteristics of each of the plurality of coil members 10A to 10F. In addition, the controller 5 can acquire the temperature change of the heating target 80 of the area of the heating target 80 heated by each of the plurality of coil members 10A to 10F by acquiring the change in the characteristics of each of the plurality of coil members 10A to 10F. That is, the controller 5 can use each of the plurality of coil members 10A to 10F like the temperature sensor 6.

[0268] For example, the controller 5 can acquire the change in the characteristics of each of the plurality of coil members 10A to 10F by providing a current sensor that acquires the current flowing through each of the plurality of coil members 10A to 10F to the circuit, and acquiring the change in the current value with respect to the voltage value. The method of acquiring the change in the characteristics of each of the plurality of coil members 10A to 10F is not limited to the current sensor. For example, the controller 5 can acquire the change in the characteristics using a voltage sensor.

[0269] When the information related to the temperature of the heating target 80 is acquired from the plurality of coil members 10A to 10F, the controller 5 can store the information as the temperature information of the heating target 80 in the storage device 52. The temperature information of the heating target 80 can be, for example, relative and qualitative information among the plurality of coil members 10A to 10F. The temperature information of the heating target 80 is not limited thereto, and can be a numerical value. The controller 5 can detect, for example, a place where the temperature of the heating target 80 is relatively low, based on information in which the positions of the plurality of coil members 10A to 10F are associated with the temperature information of the heating target 80 acquired based on the plurality of coil members 10A to 10F, respectively. Thus, the controller 5 can control the parameters of the currents flowing through the respective coil members of the plurality of coil members 10A to 10F in such a manner that the portions of the heating target 80 where the temperature is relatively low are heated more strongly. As described above, the controller 5 can control the parameters of the currents flowing through the respective coil members of the plurality of coil members 10A to 10F, based on information in which the positions of the plurality of coil members 10A to 10F are associated with the temperature information of the heating target 80 acquired based on the plurality of coil members 10A to 10F, respectively. For example, the controller 5 can change the amplitudes of the currents flowing in at least one of the plurality of coil members 10A to 10F, based on the temperature information of the heating target 80. By changing the amplitudes of the currents, the controller 5 can control the heating intensity of the region heated by the plurality of coil members 10A to 10F. In addition, the controller 5 can change the phases of the currents flowing in any two adjacent coil members, based on the temperature information of the heating target 80. By changing the phases of the currents, the controller 5 can control the positions of the regions strongly heated by the two adjacent coil members.

[0270] Further, in the present embodiment, it is described that the plurality of cooking modes include the first mode M1, the second mode M2, and the third mode M3, but the plurality of cooking modes can include modes other than the first mode M1, the second mode M2, and the third mode M3. For example, the plurality of cooking modes can include a mode suitable for a cooking method of steaming the food material 81.

[0271] Further, the example in which the processes possessed by the cooking mode are sequentially performed in the cooking mode is explained, but is not limited thereto. For example, in the second mode M2, the controller 5 can not perform all of the food heating preparation process, the temperature adjustment process, the first roasting process, and the second roasting process. In addition, the user can select the second mode M2 starting from the second roasting process from the input / output interface device 8. Further, when the second mode M2 starts from the second roasting process, the prescribed time at which the second roasting process ends can vary depending on the temperature of the heating target object 80. For example, when the temperature of the heating target object 80 at the time when the second roasting process starts without performing the food heating preparation process, the temperature adjustment process, and the first roasting process is lower than the temperature of the heating target object 80 at the time when the second roasting process starts from the food heating preparation process, the prescribed time at which the second roasting process is completed can be extended.

[0272] In addition, the case in which the power of the induction heating cooker 1A is adjusted according to a plurality of processes in the cooking mode is explained, but the power can not be adjusted according to a plurality of processes. For example, it can be that the power of the induction heating cooker 1A can be adjusted by the user inputting information of the power of the induction heating cooker 1A to the input / output interface device 8.

[0273] Further, the plurality of cooking recipe modes possessed by each cooking mode is a mode suitable for a cooking method of the food 81 based on a cooking category, and is not only a cooking suitable for the selected cooking recipe mode. For example, the "hamburger" which is one of the plurality of cooking recipe modes possessed by the second mode M2 is not a mode suitable only for making a hamburger, but is also suitable for making a stuffed green pepper.

[0274] Further, in Figures 15-17 In each of the drawings, the heating state of the curve indicating an example of the relationship between the heating time of the heating target object 80 and the heating state refers to a state in which a region in which heating is locally strong or a region in which heating is locally weak is generated. That is, the heating state does not indicate the size of the power. For example, the size of the power at the time of the first heating state P1 and the size of the power of the sixth heating state P6 can be the same size of power. In addition, the size of the power at the time of the first heating state P1 and the size of the power of the sixth heating state P6 can be different sizes of power. The size of the power of the sixth heating state P6 can be smaller than the size of the power at the time of the first heating state P1, or can be larger than the size of the power at the time of the first heating state P1.

[0275] Further, the example in which the first heating sequence H1 includes only the first heating state P1 in the preheating process of the first mode M1 is described, but is not limited thereto. For example, the first heating sequence H1 can include only the third heating state P3. In addition, the first heating sequence H1 can include the first heating state P1 and the second heating state P2. Further, the controller 5 can heat the heating target object 80 while switching the heating state according to the first heating sequence H1 including the first heating state P1 and the second heating state P2. For example, the controller 5 can heat the heating target object 80 by the first heating state P1 in the preheating process, and switch the heating state from the first heating state P1 to the second heating state P2 at the time when the preheating process is completed and the temperature adjustment process is started.

[0276] Further, in Embodiment 1, the preheating process and the temperature adjustment process in the first mode M1 are described as the same heating sequence, but can be different heating sequences. For example, the heating sequence can be switched at the time when the preheating process is completed and the temperature adjustment process is started.

[0277] Further, the example in which the second heating sequence H2 includes only the first heating state P1 and the second heating state P2 in the load detection process of the first mode M1 is described, but is not limited thereto. For example, the second heating sequence H2 can include only the third heating state P3 and the fourth heating state P4. In addition, the second heating sequence H2 can include the first heating state P1, the second heating state P2, the third heating state P3, and the fourth heating state P4. Further, the controller 5 can switch the first heating state P1 and the second heating state P2 alternately for a prescribed time according to the second heating sequence H2, and switch the third heating state P3 and the fourth heating state P4 alternately after the prescribed time elapses.

[0278] Further, in the first mode M1, an example in which the controller 5 switches the plurality of processes (the temperature adjustment process and the load detection process) and the plurality of heating sequences H0 in accordance with the temperature of the heating target object 80 is described, but is not limited thereto. For example, the controller 5 can switch the plurality of processes and the plurality of heating sequences H0 in accordance with the temperature of the oil accommodated in the heating target object 80. In the preheating process, the temperature adjustment process can be switched when the temperature of the oil reaches the target oil temperature K5. In the temperature adjustment process, the controller 5 can switch from the temperature adjustment process to the load detection process when the temperature of the oil accommodated in the heating target object 80 becomes the threshold oil temperature K6 or less. In the load detection process, the controller 5 can heat the heating target object 80 while switching the heating state so that the temperature of the oil accommodated in the heating target object 80 is maintained at the target oil temperature K5. Further, the temperature of the oil accommodated in the heating target object 80 can be detected by a thermometer provided outside the induction heating cooker 1A. The thermometer can output the detected temperature information of the oil accommodated in the heating target object 80 to the controller 5.

[0279] Further, in the first mode M1, an example in which the controller 5 switches the plurality of processes (the temperature adjustment process and the load detection process) and the plurality of heating sequences H0 in accordance with the temperature of the heating target object 80 is described, but is not limited thereto. For example, the controller 5 can switch the plurality of processes and the plurality of heating sequences H0 in accordance with the temperature of the oil accommodated in the heating target object 80. In the preheating process, the temperature adjustment process can be switched when the temperature of the oil reaches the target oil temperature K5. In the temperature adjustment process, the controller 5 can switch from the temperature adjustment process to the load detection process when the temperature of the oil accommodated in the heating target object 80 becomes the threshold oil temperature K6 or less. In the load detection process, the controller 5 can heat the heating target object 80 while switching the heating state so that the temperature of the oil accommodated in the heating target object 80 is maintained at the target oil temperature K5. Further, the temperature of the oil accommodated in the heating target object 80 can be detected by a thermometer provided outside the induction heating cooker 1A. The thermometer can output the detected temperature information of the oil accommodated in the heating target object 80 to the controller 5.

[0280] Further, in the second mode M2, an example in which the first heating sequence H11 includes only the first heating state P1 is described, but is not limited thereto. For example, the first heating sequence H11 can include the first heating state P1 and the second heating state P2. Further, the controller 5 can heat the heating target object 80 by the first heating state P1 in the food material heating preparation process, and can heat the heating target object 80 by the second heating state P2 in the temperature adjustment process.

[0281] Further, the heating sequence in the temperature adjustment process and the first firing process of the second mode M2 is described as the same heating sequence, but can be different heating sequences. For example, the heating sequence can be switched when the temperature adjustment process is completed and the first firing process is started.

[0282] Further, it is described that the controller 5 sets the target temperature of the temperature of the heating target object 80 to the first target temperature K11 to heat the heating target object 80 in the first firing process of the second mode M2, but is not limited thereto. For example, the controller 5 can set the target temperature of the temperature of the heating target object 80 to a predetermined temperature different from the first target temperature K11 to heat the heating target object 80 in the first firing process. In addition, the predetermined temperature different from the first target temperature K11 can be a temperature higher than the first target temperature K11, or can be a temperature lower than the first target temperature K11.

[0283] Further, in the first firing process of the second mode M2, the controller 5 can set the target temperature of the temperature of the heating target object 80 to the threshold temperature K12a to heat the heating target object 80. For example, in the first firing process, the controller 5 can heat the heating target object 80 from when the temperature of the heating target object 80 becomes the threshold temperature K12a or less (T13) in such a manner that the temperature of the heating target object 80 is maintained at the threshold temperature K12a. In addition, the magnitude of the current flowing through the plurality of coil pieces 10A to 10F can be controlled in accordance with the temperature difference between the temperature of the heating target object 80 detected by the temperature sensor 6 and the threshold temperature K12a, whereby the controller 5 maintains the temperature of the heating target object 80 at the threshold temperature K12a.

[0284] Further, it is described that the temperature of the heating target object 80 is lowered to a temperature lower than the first target temperature K11 by further feeding the food material 81 to the heating target object 80 in the first firing process of the second mode M2, but is not limited thereto. For example, the temperature of the heating target object 80 can be raised to a temperature higher than the first target temperature K11 by further feeding the food material 81 to the heating target object 80. Further, the temperature of the food material 81 fed to the heating target object 80 can be higher than the temperature of the heating target object 80.

[0285] Further, it is explained that the controller 5 changes the interval of the switching time of the heating state according to the second heating sequence H12 when the temperature of the heating target 80 becomes below the threshold temperature K12a (T12) in the first baking process of the second mode M2, but is not limited thereto. For example, the controller 5 can switch the heating state at the interval of the switching time of the heating state relatively identical to that in the temperature adjustment process in the first baking process. In addition, the controller 5 can change the interval of the switching time of the heating state according to the second heating sequence H12 when a prescribed time elapses from when the first baking process starts (T12) in the first baking process.

[0286] Further, it is explained that the controller 5 can further extend the interval of the time of switching the first heating state P1 and the second heating state P2 after extending the interval of the time of switching the first heating state P1 and the second heating state P2 in the second heating sequence H12 when the temperature of the heating target 80 does not rise (T14) in the first baking process of the second mode M2, but is not limited thereto. For example, the controller 5 can not switch the first heating state P1 and the second heating state P2 but heat the heating target 80 only with the first heating state P1 after extending the interval of the time of switching the first heating state P1 and the second heating state P2 in the second heating sequence H12 when the temperature of the heating target 80 does not rise (T14). In addition, the controller 5 can switch the first heating state P1 and the second heating state P2 to heat the heating target 80 after heating the heating target 80 only with the first heating state P1 when the temperature of the heating target 80 rises by a prescribed temperature.

[0287] Alternatively, the controller 5 can maintain the temperature of the heating target 80 at the temperature at which the temperature of the heating target 80 does not rise (T14) when the temperature of the heating target 80 does not rise (T14) after extending the interval of the time of switching the first heating state P1 and the second heating state P2 in the second heating sequence H12 in the first baking process of the second mode M2. For example, the temperature at which the temperature of the heating target 80 does not rise (T14) is a temperature above the threshold temperature K12a and is a temperature lower than the first target temperature K11.

[0288] Further, the controller 5 can change the interval of the switching time of the heating state to be relatively identical to that in the temperature adjustment process when the temperature of the heating target 80 reaches the first target temperature K11 after the temperature of the heating target 80 becomes below the threshold temperature K12a in the first baking process of the second mode M2.

[0289] Further, the second heating sequence H12 of the second mode M2 is explained as including only the first heating state P1 and the second heating state P2, but is not limited thereto. For example, the second heating sequence H12 can include only the first heating state P1. In addition, the second heating sequence H12 can include the first heating state P1, the second heating state P2, the third heating state P3, and the fourth heating state P4. For example, the controller 5 can alternately switch the first heating state P1 and the second heating state P2 according to the second heating sequence H12 until the temperature of the heating target object 80 reaches the second target temperature K12b. In addition, the controller 5 can alternately switch the third heating state P3 and the fourth heating state P4 according to the second heating sequence H12 from when the temperature of the heating target object 80 reaches the second target temperature K12b to when a prescribed time elapses.

[0290] Further, the second heating sequence H12 of the second mode M2 is explained as including only the first heating state P1 and the second heating state P2, but is not limited thereto. For example, the second heating sequence H12 can include only the first heating state P1. In addition, the second heating sequence H12 can include the first heating state P1, the second heating state P2, the third heating state P3, and the fourth heating state P4. For example, the controller 5 can alternately switch the first heating state P1 and the second heating state P2 according to the second heating sequence H12 until the temperature of the heating target object 80 reaches the second target temperature K12b. In addition, the controller 5 can alternately switch the third heating state P3 and the fourth heating state P4 according to the second heating sequence H12 from when the temperature of the heating target object 80 reaches the second target temperature K12b to when a prescribed time elapses.

[0291] Further, the second heating sequence H12 of the second mode M2 is explained as including only the first heating state P1 and the second heating state P2, but is not limited thereto. For example, the second heating sequence H12 can include only the first heating state P1. In addition, the second heating sequence H12 can include the first heating state P1, the second heating state P2, the third heating state P3, and the fourth heating state P4. For example, the controller 5 can alternately switch the first heating state P1 and the second heating state P2 according to the second heating sequence H12 until the temperature of the heating target object 80 reaches the second target temperature K12b. In addition, the controller 5 can alternately switch the third heating state P3 and the fourth heating state P4 according to the second heating sequence H12 from when the temperature of the heating target object 80 reaches the second target temperature K12b to when a prescribed time elapses.

[0292] Further, the second heating sequence H12 of the second mode M2 is explained as including only the first heating state P1 and the second heating state P2, but is not limited thereto. For example, the second heating sequence H12 can include only the first heating state P1. In addition, the second heating sequence H12 can include the first heating state P1, the second heating state P2, the third heating state P3, and the fourth heating state P4. For example, the controller 5 can alternately switch the first heating state P1 and the second heating state P2 according to the second heating sequence H12 until the temperature of the heating target object 80 reaches the second target temperature K12b. In addition, the controller 5 can alternately switch the third heating state P3 and the fourth heating state P4 according to the second heating sequence H12 from when the temperature of the heating target object 80 reaches the second target temperature K12b to when a prescribed time elapses.

[0293] Further, the second heating sequence H12 of the second mode M2 is explained as including only the first heating state P1 and the second heating state P2, but is not limited thereto. For example, the second heating sequence H12 can include only the first heating state P1. In addition, the second heating sequence H12 can include the first heating state P1, the second heating state P2, the third heating state P3, and the fourth heating state P4. For example, the controller 5 can alternately switch the first heating state P1 and the second heating state P2 according to the second heating sequence H12 until the temperature of the heating target object 80 reaches the second target temperature K12b. In addition, the controller 5 can alternately switch the third heating state P3 and the fourth heating state P4 according to the second heating sequence H12 from when the temperature of the heating target object 80 reaches the second target temperature K12b to when a prescribed time elapses.

[0294] Further, it is described that the controller 5 sets the second target temperature K12b to be the same as the threshold temperature K12a to heat the heating object 80 in the second baking process of the second mode M2, but is not limited thereto. The second target temperature K12b can also be different from the threshold temperature K12a. For example, the controller 5 can also set the second target temperature K12b to be the same as the first target temperature K11 to heat the heating object 80 in the second baking process.

[0295] Alternatively, the controller 5 can also set the second target temperature K12b to be the threshold temperature K13 to heat the heating object 80. In the second baking process, the controller 5 can also heat the heating object 80 in such a manner that the temperature of the heating object 80 is maintained at the threshold temperature K13 from when the temperature of the heating object 80 becomes the threshold temperature K13 or less (T6). In addition, the size of the current flowing through the plurality of coil members 10A to 10F can also be controlled in accordance with the temperature difference between the temperature of the heating object 80 detected by the temperature sensor 6 and the threshold temperature K13, whereby the controller 5 maintains the temperature of the heating object 80 at the threshold temperature K13.

[0296] Further, it is described that the controller 5 changes the interval of the switching time of the heating state in accordance with the third heating sequence H13 when the temperature of the heating object 80 becomes the threshold temperature K13 or less (T16) in the second baking process of the second mode M2, but is not limited thereto. For example, the controller 5 can also change the interval of the switching time of the heating state in accordance with the third heating sequence H13 when a predetermined time elapses from the start of the second baking process (T15) in the second baking process.

[0297] Further, it is described that the third heating sequence H13 includes only the third heating state P3 and the fifth heating state P5 in the second baking process of the second mode M2, but is not limited thereto. For example, the third heating sequence H13 can also include only the third heating state P3. In addition, the third heating sequence H13 can also include the first heating state P1, the second heating state P2, the third heating state P3, and the fifth heating state P5.

[0298] Further, it is described that the heating sequences of the first baking process and the second baking process of the second mode M2 (the second heating sequence H12 including the first heating state P1 and the second heating state P2 and the third heating sequence H13 including the third heating state P3 and the fifth heating state P5) include different heating states, respectively, but can also be heating sequences including the same heating states. For example, the heating sequences of the first baking process and the second baking process can also be heating sequences including only the first heating state P1 and the second heating state P2, respectively.

[0299] Further, it is explained that in the third heating sequence H13 in the second mode M2, the interval of the switching time of the heating state from the heating time T16 to the heating time T17 is longer than that from the heating time T15 to the heating time T16, but it is not limited thereto. For example, the interval of the switching time of the heating state from the heating time T16 to the heating time T17 can be shorter than that from the heating time T15 to the heating time T16.

[0300] Further, it is explained that in the second mode M2, the controller 5 can heat the heating target object 80 in the second baking process by a heating power different from the heating power by which the heating target object 80 is heated in the temperature adjustment process, but the controller 5 can heat the heating target object 80 in the second baking process by the same heating power as the heating power by which the heating target object 80 is heated in the temperature adjustment process.

[0301] Further, in the second mode M2, the controller 5 can heat the heating target object 80 in the second baking process by the same heating power as the heating power by which the heating target object 80 is heated in the first baking process, or can heat the heating target object 80 in the second baking process by a heating power different from the heating power by which the heating target object 80 is heated in the first baking process.

[0302] Further, in the third mode M3, only the food material 81 that does not include a liquid food material can be accommodated in the heating target object 80 and heated. For example, cooking can be performed by accommodating and heating vegetables and meat, which are solid food materials, in the heating target object 80 without using a beverage, which is a liquid food material, as in waterless curry.

[0303] Further, it is explained that in the third mode M3, the first heating sequence H21 includes only the first heating state P1 and the second heating state P2, but it is not limited thereto. For example, the first heating sequence H21 can include only the first heating state P1. Alternatively, the first heating sequence H21 can include the first heating state P1, the second heating state P2, and a third heating state P3.

[0304] Further, it is explained that in the third mode M3, the second heating sequence H22 includes only the third heating state P3, the fourth heating state P4, the fifth heating state P5, and the sixth heating state P6, but it is not limited thereto. For example, the second heating sequence H22 can include the first heating state P1 and the second heating state P2.

[0305] Further, it is explained that in the switching of the heating state corresponding to the second heating sequence H22 in the second heating process of the third mode M3, the range of the region in which the magnetic flux is concentrated in the heating state before the switching and the heating state after the switching are relatively different, but it is not limited thereto. For example, in the switching of the heating state corresponding to the second heating sequence H22, the range of the region in which the magnetic flux is concentrated in the heating state before the switching and the heating state after the switching can be relatively the same. For example, the controller 5 can switch the heating state from the third heating state P3 to the fourth heating state P4 according to the second heating sequence H22.

[0306] Further, in the third mode M3 of the present embodiment, the range of the region in which the magnetic flux is concentrated in the third heating state P3 and the range of the region in which the magnetic flux is concentrated in the fourth heating state P4 are relatively the same, but the region in which the magnetic flux is concentrated in the third heating state P3 can also be relatively different from the region in which the magnetic flux is concentrated in the fourth heating state P4. For example, the range of the region in which the magnetic flux is concentrated in the third heating state P3 can be set to the portions in which the coil members 10B, 10D, and 10F are arranged in the adjacent parts of the two adjacent coil members. In addition, the range of the region in which the magnetic flux is concentrated in the fourth heating state P4 can be set to the portions in which the coil members 10A, 10C, and 10E are arranged in the adjacent parts of the two adjacent coil members.

[0307] Further, in the third mode M3 of the present embodiment, the range of the region in which the magnetic flux is concentrated in the fifth heating state P5 and the range of the region in which the magnetic flux is concentrated in the sixth heating state P6 are relatively the same, but the range of the region in which the magnetic flux is concentrated in the fifth heating state P5 and the range of the region in which the magnetic flux is concentrated in the sixth heating state P6 can also be relatively different. For example, the range of the region in which the magnetic flux is concentrated in the fifth heating state P5 can be set to the portions in which the coil members 10A, 10C, and 10E are arranged in the parts along the first outer peripheral line L10. In addition, the range of the region in which the magnetic flux is concentrated in the sixth heating state P6 can be set to the portions in which the coil members 10B, 10D, and 10F are arranged in the parts along the first outer peripheral line L10.

[0308] Further, it is explained that in the second heating process of the third mode M3, the controller 5 switches the heating state in the order of the third heating state P3, the fifth heating state P5, the fourth heating state P4, and the sixth heating state P6 from the heating time T22 to the heating time T23, but it is not limited thereto. For example, the controller 5 can switch the heating state in the order of the third heating state P3, the fourth heating state P4, the fifth heating state P5, and the sixth heating state P6 from the heating time T22 to the heating time T23.

[0309] Further, it is explained that the controller 5 switches the heating state from the heating time T22 to the heating time T23 at intervals of relatively equal switching times of the heating state in the second heating process of the third mode M3, but is not limited thereto. For example, the controller 5 can change the intervals of the switching times of the heating state for each heating state between the heating time T22 and the heating time T23 of the second heating process.

[0310] Further, it is explained that the controller 5 switches the heating state from the heating time T23 to the heating time T24 in the order of the third heating state P3, the sixth heating state P6, the fourth heating state P4, and the fifth heating state P5 in the second heating process of the third mode M3, but is not limited thereto. For example, the controller 5 can switch the heating state from the heating time T23 to the heating time T24 in the order of the third heating state P3, the fourth heating state P4, the fifth heating state P5, and the sixth heating state P6.

[0311] Further, it is explained that the controller 5 switches the heating state from the heating time T23 to the heating time T24 at intervals of relatively equal switching times of the heating state in the second heating process of the third mode M3, but is not limited thereto. For example, the controller 5 can change the intervals of the switching times of the heating state for each heating state between the heating time T23 and the heating time T24 of the second heating process.

[0312] Further, it is explained that the intervals of the switching times of the heating state from the heating time T23 to the heating time T24 can be relatively the same as the intervals of the switching times of the heating state from the heating time T22 to the heating time T23, but is not limited thereto. For example, the intervals of the switching times of the heating state from the heating time T23 to the heating time T24 can be different from the intervals of the switching times of the heating state from the heating time T22 to the heating time T23.

[0313] (Embodiment 2)

[0314] An induction heating cooker of Embodiment 2 of the present disclosure is explained. In Embodiment 2, the same reference numerals are explained for the structures same as or equivalent to Embodiment 1. Further, in Embodiment 2, the explanation repeated from Embodiment 1 is omitted.

[0315] Figure 18 is a schematic view of an example of the induction heating cooker 1B of Embodiment 2 of the present disclosure.

[0316] The induction heating cooker 1B of Embodiment 2 is different from the induction heating cooker 1A of Embodiment 1 in that it further has the coil unit 4B.

[0317] As Figure 18As shown, the induction heating cooker 1B has a coil unit 4A, multiple coil units 4B, a controller 5, multiple temperature sensors 6, and an input / output interface device 8 mounted inside the housing 3.

[0318] Coil unit 4B is different from coil unit 4A. The difference between coil unit 4B and coil unit 4A is that coil unit 4B also has a second heating region S10 for heating the object 80. The heating region of coil unit 4B is larger than that of coil unit 4A.

[0319] Multiple coil units 4B are respectively disposed below the top plate 2. The multiple coil units 4B respectively perform induction heating on the heating object 80 placed on the opposite part of the top plate 2. The structure of the coil unit 4B will be described later.

[0320] A temperature sensor 6 is provided within the heating area of ​​the object 80 to be heated by the coil unit 4B. Within the heating area of ​​the object 80 to be heated by one coil unit 4B, there are two or more temperature sensors 6.

[0321] The structure of coil unit 4B is described in detail.

[0322] Figure 19 This is a top view of an example of the coil unit 4B of the induction heating cooker 1B according to Embodiment 2 of this disclosure.

[0323] like Figure 19 As shown, the coil unit 4B includes multiple coil elements 10A to 10J for heating the object 80. The multiple coil elements 10A to 10J are arranged in the XY plane in a third heating region S20 for heating the object 80. The third heating region S20 includes a first heating region S0 and a second heating region S10.

[0324] The second heating region S10 is a region in the XY plane surrounding the first heating region S0, and is a region where multiple coil elements 10G to 10J are arranged. The second heating region S10 is located further inward than the first heating region S0 in the Y-axis direction. The second heating region S10 has a fan-shaped shape with a center C2 in the XY plane. In the second heating region S10, the central angle formed by two straight lines extending from the center C2 of the circle toward the outer periphery is, for example, 180° or more and 300° or less. In this embodiment, the central angle is 240°. In the second heating region S10, the two straight lines extending from the center C2 of the circle toward the outer periphery correspond to the second boundary lines L21 and L25. In the XY plane, there is no arc-shaped second outer periphery line L20 between the second boundary lines L21 and L25. Therefore, in the XY plane, there is no second heating region S10 between the second boundary lines L21 and L25.

[0325] The second heating region S10 is provided in the X-Y plane in a manner of surrounding a portion of the first heating region S0. Specifically, in the X-Y plane, the second heating region S10 is provided around the first heating region S0 in a manner of configuring two second boundary lines L21, L25 that demarcate the second heating region S10 to be around the first outer peripheral line L10 of the first heating region S0. In other words, in the X-Y plane, the first heating region S0 is configured between the second boundary lines L21, L25 that demarcate the outer periphery of the second heating region S10 and in a portion where the second heating region S10 is not provided.

[0326] The second heating region S10 has a plurality of second coil arrangement regions S11-S14. The plurality of second coil arrangement regions S11-S14 are arranged radially around the center C2 of the second heating region S10 and adjacently in the X-Y plane. Specifically, the plurality of second coil arrangement regions S11-S14 are demarcated by the plurality of second boundary lines L21-L25 that extend radially outward from the center C2 of the second heating region S10 when viewed from above and the second outer peripheral line L20 that demarcates the outer periphery of the circular arc portion of the second heating region S10.

[0327] The plurality of second boundary lines L21-L25 are arranged radially around the center C2 of the second heating region S10 and at equal intervals when viewed from above. The plurality of second boundary lines L21-L25 are straight lines that extend from the center C2 of the second heating region S10 toward the outer periphery in the X-Y plane. The angle formed by two adjacent second boundary lines among the plurality of second boundary lines L21-L25 is substantially the same. Thus, in the X-Y plane, the plurality of second coil arrangement regions S11-S14 have substantially the same shape and substantially the same size.

[0328] In Embodiment 2, the plurality of second boundary lines has five second boundary lines L21-L25, and the angle formed by two adjacent second boundary lines is 60 degrees. Thus, the second heating region S10 is divided into four second coil arrangement regions S11-S14 that have substantially the same shape and substantially the same size in the X-Y plane.

[0329] The controller 5 of the induction heating cooker IB controls at least a part of the parameters of the electric current flowing through the plurality of coil members 10A-10J in the third heating region S20 including the first heating region S0 and the second heating region S10 while causing the electric current to flow through all of the plurality of coil members 10A-10J in the third heating region S20. The controller 5 switches a plurality of heating states in which the local part of the heating target object 80 in the third heating region S20 is different in the strength distribution by controlling at least a part of the parameters of the electric current flowing through the plurality of coil members 10A-10J in the third heating region S20.

[0330] The controller 5 also has a plurality of wide-range heating sequences (not shown) in which one or more of the plurality of heating states in the third heating region S20 are combined. The controller 5 switches the plurality of wide-range heating sequences in accordance with the cooking mode. The switching of the plurality of wide-range heating sequences of Embodiment 2 is the same as the switching of the heating sequences of Embodiment 1. For example, in the preheating process, the temperature adjustment process of the first mode M1, the controller 5 controls at least a portion of the parameters of the current flowing through each of the plurality of coil elements 10A to 10J in accordance with a first wide-range heating sequence that includes the first heating state in Embodiment 2. In addition, in the load detection process of the first mode M1, the controller 5 controls at least a portion of the parameters of the current flowing through each of the plurality of coil elements 10A to 10J in accordance with a second wide-range heating sequence that includes the first heating state in Embodiment 2 and a second heating state in Embodiment 2, which is a state in which the distribution of the local strength of the heating of the heating target object 80 is different from the first heating state. The first heating state and the second heating state in Embodiment 2 will be described later.

[0331] As electronic components for realizing the heating of the plurality of coil elements 10A to 10J of the induction heating cooker 1B, as with the case described in Embodiment 1, there are a diode bridge, a smoothing capacitor, a plurality of inverter circuits, and a plurality of resonance capacitors. In the induction heating cooker 1B, the plurality of coil elements 10A to 10J, each inverter circuit, and each resonance capacitor are connected as with the case described in Embodiment 1, as with the circuit related to the coil element 10A.

[0332] [Heating States]

[0333] The details of each of the first heating state to the sixth heating state will be described. The first heating state to the sixth heating state are classified by the relationship (first parameter to fourth parameter) of the parameters of the current at positions adjacent to each other of each of the plurality of coil elements 10A to 10J. Furthermore, the relationship of the parameters of the current at positions adjacent to each other of each of the plurality of coil elements 10A to 10J in Embodiment 2 is the same as the relationship of the parameters of the current at positions adjacent to each other of each of the plurality of coil elements 10A to 10F described in Embodiment 1.

[0334] [First Parameter]

[0335] Figure 20 is a schematic diagram showing an example of a region in which the magnetic flux is concentrated in the first heating state of the induction heating cooker 1B of Embodiment 2 of the present disclosure.

[0336] In Figure 20 , ten coil elements 10A to 10J are described as the coil unit 4B. Figure 20The multiple coil components 10A to 10J shown are equivalent to Figure 19 The multiple coil components 10A to 10J are shown. Figure 20 In the text, for the sake of simplicity, details regarding multiple coil components 10A to 10J are omitted. Figure 3 The first coil section 20, the second coil section 30, and the third coil section 40 described herein are represented as single coils. However, the plurality of coil elements 10A to 10J are not limited to this; for example, other coils may be arranged in the central portion of each of the plurality of coil elements 10A to 10J. Furthermore, Figures 21-25 The multiple coil components 10A to 10F shown are also related to Figure 20 Similarly equivalent to Figure 19 The multiple coil components 10A to 10J are shown.

[0337] exist Figure 20 In this process, region S31 is the area where magnetic flux is concentrated when the multiple coil elements 10A to 10J flow, thus enabling powerful heating of the object 80. Region S31 corresponds to the adjacent portions of two adjacent coil elements among the multiple coil elements 10A to 10J.

[0338] By allowing a current having the first parameters shown in Table 1 to flow through each of the plurality of coil elements 10A to 10J, the portion of the object to be heated 80 placed in the region corresponding to region S31 can be heated more strongly than other portions of the object to be heated 80. The controller 5 can heat the object to be heated 80 in a first heating state by controlling the current for all groups of two adjacent coil elements in a manner that becomes the first parameters shown in Table 1.

[0339] [Second parameter]

[0340] Figure 21 This is a schematic diagram showing an example of the region of magnetic flux concentration in the second heating state of the induction heating cooker 1B according to Embodiment 2 of this disclosure.

[0341] exist Figure 21 In this context, region S32 is the area where magnetic flux is concentrated when the multiple coil elements 10A to 10J flow, thus enabling powerful heating of the object 80. Region S32 corresponds to the non-adjacent portions of two adjacent coil elements among the multiple coil elements 10A to 10J.

[0342] The controller 5 is able to heat the heating target 80 by causing a current having the second parameter shown in Table 2 to flow through each of the plurality of coil pieces 10A to 10J. The controller 5 is able to heat the heating target 80 in the second heating state by controlling the current in such a manner that the second parameter shown in Table 2 is obtained for all groups of two adjacent coil pieces.

[0343] [Third Parameter]

[0344] Figure 22 is a schematic diagram showing an example of a region in which magnetic flux is concentrated in the third heating state of the induction heating cooker 1B according to Embodiment 2 of the present disclosure. Figure 23 is a schematic diagram showing another example of a region in which magnetic flux is concentrated in the fourth heating state of the induction heating cooker 1B according to Embodiment 2 of the present disclosure.

[0345] The controller 5 controls the current in the third parameter shown in Table 3 in such a manner that the amplitude of the current flowing through the coil pieces 10A, 10C, 10E, 10G, and 10I is greater than the amplitude of the current flowing through the coil pieces 10B, 10D, 10F, 10H, and 10J, and thereby is able to heat the heating target 80 in the third heating state. In the third heating state, magnetic flux is concentrated in the region S33 shown in Figure 22 , and thus the heating target 80 is able to be heated strongly.

[0346] The controller 5 controls the current in the third parameter in such a manner that the amplitude of the current flowing through the coil pieces 10B, 10D, 10F, 10H, and 10J is greater than the amplitude of the current flowing through the coil pieces 10A, 10C, 10E, 10G, and 10I, and thereby is able to heat the heating target 80 in the fourth heating state. In the fourth heating state, magnetic flux is concentrated in the region S34 shown in Figure 23 , and thus the heating target 80 is able to be heated strongly.

[0347] [Fourth Parameter]

[0348] Figure 24 is a schematic diagram showing an example of a region in which magnetic flux is concentrated in the fifth heating state of the induction heating cooker 1B according to Embodiment 2 of the present disclosure. Figure 25 is a schematic diagram showing another example of a region in which magnetic flux is concentrated in the sixth heating state of the induction heating cooker 1B according to Embodiment 2 of the present disclosure.

[0349] The controller 5 controls the parameters of the current in the fourth parameters shown in Table 4 in such a manner that the amplitude of the current flowing through the coil pieces 10B, 10D, 10F, 10H, 10J is larger than the amplitude of the current flowing through the coil pieces 10A, 10C, 10E, 10G, 10I, whereby the heating target object 80 can be heated by the fifth heating state. In the fifth heating state, the magnetic flux is concentrated in the region S35 shown in the drawing, and thus the heating target object 80 can be heated strongly. Figure 24

[0350] The controller 5 controls the parameters of the current in the fourth parameters in such a manner that the amplitude of the current flowing through the coil pieces 10A, 10C, 10E, 10G, 10I is larger than the amplitude of the current flowing through the coil pieces 10B, 10D, 10F, 10H, 10J, whereby the heating target object 80 can be heated by the sixth heating state. In the sixth heating state, the magnetic flux is concentrated in the region S36 shown in the drawing, and thus the heating target object 80 can be heated strongly. Figure 25

[0351] The induction heating cooker 1B according to Embodiment 2 of the present disclosure can achieve the following effects.

[0352] ​​The induction heating cooker 1B of Embodiment 2 has the coil unit 4B further having a second heating region S10 that heats the heating target object 80 in plan view (X-Y plane). The second heating region S10 has a plurality of coil elements 10G to 10J that heat the heating target object 80. The second heating region S10 is provided around the first heating region S0 in plan view and has a fan shape. The second heating region S10 has a plurality of second coil arrangement regions S11 to S14 demarcated by a plurality of second boundary lines L21 to L25 and a second outer peripheral line L20. The plurality of second boundary lines L21 to L25 extend radially from the center C2 of the second heating region S10 toward the outer periphery of the arc portion of the second heating region S10 in plan view. The second outer peripheral line L20 demarcates the outer periphery of the arc portion of the second heating region S10. The plurality of coil elements 10G to 10J of the second heating region S10 are arranged within the plurality of second coil arrangement regions S11 to S14 in plan view. The controller 5 controls at least a part of the parameters of the current flowing through the plurality of coil elements 10A to 10J in the third heating region S20 including the first heating region S0 and the second heating region S10 while causing the current to flow through all of the plurality of coil elements 10A to 10J in the third heating region S20. The controller 5 is able to switch a plurality of heating states different in the intensity distribution for the local part of the heating target object 80 in the third heating region S20 by controlling at least a part of the parameters of the current flowing through the plurality of coil elements 10A to 10J in the third heating region S20. The controller 5 has a plurality of wide-range heating sequences in which one or more of the plurality of heating states in the third heating region S20 are combined. The controller 5 switches the plurality of wide-range heating sequences in accordance with the cooking mode.

[0353] According to such a configuration, the induction heating cooker 1B of Embodiment 2 is able to efficiently heat the heating target object 80. For example, according to the coil unit 4B, the heating target object 80 is able to be heated in the second heating region S10 in addition to the first heating region S0. In addition, the coil unit 4B is able to heat the heating target object 80 arranged across the first heating region S0 and the second heating region S10, and thus is able to reduce the region difficult to heat. Thus, the induction heating cooker 1B of Embodiment 2 is able to reduce the uneven heating in heating the heating target object 80 and is able to more efficiently heat the heating target object 80.

[0354] Further, the second heating region S10 is divided into a plurality of second coil arrangement regions Sll-S14 by a plurality of second boundary lines L21-L25 and a second outer peripheral line L20 in the X-Y plane. In each of the plurality of second coil arrangement regions Sll-S14, the coil wire 11 of the plurality of coil members 10G-10J constituting the second heating region S10 is arranged along two adjacent second boundary lines. Thereby, the gap between the plurality of coil members 10G-10J of the second heating region S10 can be reduced, and the variation in the gap can be reduced. As a result, the region where heating is difficult to occur between the plurality of coil members 10G-10J of the second heating region S10 can be reduced. Further, the gap between the plurality of coil members 10G-10J of the second heating region S10 can be reduced, and thus the heating efficiency of the coil unit 4B can be improved, and miniaturization can be achieved.

[0355] Further, the second heating region S10 is divided into a plurality of second coil arrangement regions Sll-S14 by a plurality of second boundary lines L21-L25 and a second outer peripheral line L20 in the X-Y plane. In each of the plurality of second coil arrangement regions Sll-S14, the coil wire 11 of the plurality of coil members 10G-10J constituting the second heating region S10 is arranged along two adjacent second boundary lines. Thereby, the gap between the plurality of coil members 10G-10J of the second heating region S10 can be reduced, and the variation in the gap can be reduced. As a result, the region where heating is difficult to occur between the plurality of coil members 10G-10J of the second heating region S10 can be reduced. Further, the gap between the plurality of coil members 10G-10J of the second heating region S10 can be reduced, and thus the heating efficiency of the coil unit 4B can be improved, and miniaturization can be achieved.

[0356] Further, the second heating region S10 is divided into a plurality of second coil arrangement regions Sll-S14 by a plurality of second boundary lines L21-L25 and a second outer peripheral line L20 in the X-Y plane. In each of the plurality of second coil arrangement regions Sll-S14, the coil wire 11 of the plurality of coil members 10G-10J constituting the second heating region S10 is arranged along two adjacent second boundary lines. Thereby, the gap between the plurality of coil members 10G-10J of the second heating region S10 can be reduced, and the variation in the gap can be reduced. As a result, the region where heating is difficult to occur between the plurality of coil members 10G-10J of the second heating region S10 can be reduced. Further, the gap between the plurality of coil members 10G-10J of the second heating region S10 can be reduced, and thus the heating efficiency of the coil unit 4B can be improved, and miniaturization can be achieved.

[0357] Further, in Embodiment 2, the heating states include the first to sixth heating states, but are not limited to the first to sixth heating states. For example, depending on the number of types of amplitudes, the difference in frequency, and the difference in phase, the heating states can be different from the first to sixth heating states. Further, the relationship of the parameters of the currents adjacent to each other can be different in each of the plurality of coil members 10A-10J. Also, the relationship of the parameters of the currents adjacent to each other can be different in the opposing coil members (for example, the coil member 10A and the coil member 10D).

[0358] Further, the heating of the plurality of coil members 10G-10J of the second heating region S10 can be controlled by the control portion individually. For example, in the X-Y plane, two coil members arranged at the center of the second heating region S10 or two coil members arranged at the outer side of the center of the second heating region S10 can be used for heating, and heating can be performed on an arbitrary portion of the heating target object 80 intensively. Alternatively, the plurality of coil members 10G-10J arranged in the second heating region S10 can be used for heating, and heating can be performed on the heating target object 80 uniformly.

[0359] The example in which the controller 5 controls at least a part of the parameters of the current flowing through the plurality of coil members 10A to 10J in the third heating region S20 while causing the current to flow through all of the plurality of coil members 10A to 10J included in the third heating region S20 including the first heating region S0 and the second heating region S10 is described, but is not limited thereto. For example, the controller 5 can also control at least a part of the parameters of the current flowing through the plurality of coil members 10A to 10F of the first heating region S0 while causing the current to flow through only the plurality of coil members 10A to 10F of the first heating region S0.

[0360] Further, in Embodiment 2, the example in which the relationship of the parameters of the current of the mutually adjacent portions of each of the plurality of coil members 10A to 10J is the first parameter to the fourth parameter is described, but is not limited thereto. For example, the relationship of the parameters of the current of the mutually adjacent portions of each of the plurality of coil members 10A to 10J can also be the fifth parameter or the sixth parameter described later.

[0361] [Fifth Parameter]

[0362] The controller 5 can heat the inner portion of the heating target 80 more strongly than the outer portion of the heating target 80 by controlling the parameters of the current flowing through the plurality of coil members 10A to 10J to be the fifth parameter shown in Table 5. In addition, the controller 5 can more strongly heat the inner portion of the heating target 80 in a wider range when controlling the parameters of the current flowing through the plurality of coil members 10A to 10J to be the fifth parameter than when controlling the parameters of the current flowing through the plurality of coil members 10A to 10J to be the first parameter shown in Table 1.

[0363] [Sixth Parameter]

[0364] The controller 5 can make the intensity of heating of the region heated by the prescribed coil member weaker than the intensity of the region heated by the other coil members by reducing the amplitude of the current flowing through the prescribed coil member in the sixth parameter shown in Table 6.

[0365] Further, in the plurality of heating states, the controller 5 changes the intensity of heating using the amplitudes of two kinds of currents, but is not limited thereto. For example, the controller 5 can also change the intensity of heating of two or more kinds.

[0366] [Variant 1]

[0367] An example of the second mode M2 including a process other than the preheating process, the temperature adjustment process, and the baking process will be described. An example of the cooking recipe mode "frozen dumpling" included in the second mode M2 will be described. The cooking recipe mode "frozen dumpling" is a cooking recipe mode suitable for cooking the food material 81 by putting the frozen and unheated dumpling (food material 81) into the heating target 80 and heating the heating target 80, for example.

[0368] Figure 26 is a graph showing a curve representing the relationship between the heating time of the heating target 80 and the temperature of the heating target 80 detected by the temperature sensor 6 and a curve representing the relationship between the heating time of the heating target 80 and the heating state under the second mode M2 of the induction heating cooker 1A of the modification 1.

[0369] The cooking recipe mode "frozen dumpling" includes a food material heating preparation process, a temperature adjustment process, a steaming process, and a baking process. The steaming process is a process of steaming the food material 81 by increasing the temperature of the heating target 80 after the heating target 80 is maintained at a predetermined temperature.

[0370] As shown in Figure 26 , in the food material heating preparation process, the controller 5 controls at least a part of the parameters of the current flowing through each of the plurality of coil members 10A to 10F in accordance with the first heating sequence H31. When the temperature of the heating target 80 reaches the first target temperature K31 (T31), the controller 5 starts the temperature adjustment process as the next process. In the temperature adjustment process, the controller 5 controls at least a part of the parameters of the current flowing through each of the plurality of coil members 10A to 10F in accordance with the second heating sequence H32.

[0371] The second heating sequence H32 includes the first heating state P1, the second heating state P2, the third heating state P3, and the fourth heating state P4. The controller 5 switches the heating state by the process, the heating time, and / or the temperature of the heating target 80 in accordance with the second heating sequence H32. In the temperature adjustment process, the controller 5 alternately switches the first heating state P1 and the second heating state P2 in accordance with the second heating sequence H32.

[0372] The controller 5 starts the steaming process included in the second mode M2 after the temperature adjustment process is completed (T32). For example, the controller 5 starts the steaming process when it detects that the food material 81 is put into the heating target 80. In addition, the controller 5 can detect that the food material 81 is put into the heating target 80 by the temperature of the heating target 80 decreasing from the first target temperature K31 due to the food material 81 being put into the heating target 80. Furthermore, the controller 5 can detect that the food material 81 is put into the heating target 80 when the temperature of the heating target 80 decreases from the first target temperature K31 to a predetermined temperature.

[0373] The controller 5 switches the heating state according to the second heating sequence H32 based on the switching from the temperature adjustment process to the steaming process. The controller 5 heats the heating target 80 in the steaming process until the temperature of the heating target 80 reaches the second target temperature K32 (T33). According to the second heating sequence H32, the heating target 80 is heated by the first heating state Pl from the heating time T32 to the heating time T33.

[0374] The controller 5 maintains the temperature of the heating target 80 at the second target temperature K32 after the temperature of the heating target 80 reaches the second target temperature K32 in the steaming process. The controller 5 maintains the temperature of the heating target 80 at the second target temperature K32 for a prescribed time from when the temperature of the heating target 80 reaches the second target temperature K32 (T33) in the steaming process.

[0375] The controller 5 switches the heating state when the temperature of the heating target 80 reaches the second target temperature K32 (T33) in the steaming process. The controller 5 switches the third heating state P3 and the fourth heating state P4 according to the second heating sequence H32 from the heating time T33 until the prescribed time elapses (T34) in the steaming process. The controller 5 alternately switches the third heating state P3 and the fourth heating state P4 according to the second heating sequence H32 from the heating time T33 to the heating time T34.

[0376] The controller 5 switches the heating state when the prescribed time elapses from when the temperature of the heating target 80 reaches the second target temperature K32 (T33) in the steaming process (T34). The controller 5 alternately switches the first heating state Pl and the second heating state P2 according to the second heating sequence H32. The controller 5 alternately switches the first heating state Pl and the second heating state P2 according to the second heating sequence H32 from the heating time T34 until the temperature of the heating target 80 reaches the first target temperature K31 (T35). The steaming process is completed when the temperature of the heating target 80 reaches the first target temperature K31 (T35).

[0377] The controller 5 starts the roasting process after the steaming process is completed. The controller 5 switches to the third heating sequence H33 to heat the heating target 80 for a prescribed time in the roasting process. The controller 5 heats the heating target 80 at the first target temperature K31 according to the third heating sequence H33.

[0378] The third heating sequence H33 includes the third heating state P3 and the fourth heating state P4. According to the third heating sequence H33, the controller 5 alternately switches the third heating state P3 and the fourth heating state P4 while heating the heating target object 80 for a prescribed time. The controller 5 can control so that no current flows through the plurality of coil pieces 10A to 10F when a prescribed time elapses from when the roasting process is started (T35) (T36).

[0379] In addition, an example in which the controller 5 does not switch the heating sequence when switching from the temperature adjustment process to the steaming process is described, but the heating sequence can be switched when switching from the temperature adjustment process to the steaming process.

[0380] In addition, an example in which the second heating sequence H32 includes the first heating state P1, the second heating state P2, the third heating state P3, and the fourth heating state P4 is described, but is not limited thereto. For example, the second heating sequence H32 can include only the first heating state P1 and the second heating state P2. In addition, the second heating sequence H32 including only the first heating state P1 and the second heating state P2 can change the time interval at which the heating states are switched depending on the heating time and / or the temperature of the heating target object 80.

[0381] In addition, an example in which the third heating sequence H33 includes the third heating state P3 and the fourth heating state P4 is described, but is not limited thereto. For example, the third heating sequence H33 can include only the first heating state P1 and the second heating state P2. In addition, the third heating sequence H33 can include the first heating state P1 and a fifth heating state P5.

[0382] In addition, an example in which the controller 5 maintains the temperature of the heating target object 80 at the second target temperature K32 for a prescribed time in the steaming process from when the temperature of the heating target object 80 reaches the second target temperature K32 (T33) is described, but is not limited thereto. For example, the controller 5 can maintain the temperature of the heating target object 80 at the temperature at which the temperature of the heating target object 80 relatively does not change for a prescribed time in the steaming process from when the temperature of the heating target object 80 relatively does not change.

[0383] In addition, in Figure 26 In addition, an example in which the second target temperature K32 is illustrated as a temperature lower than the first target temperature K31, but the second target temperature K32 can be a temperature higher than the first target temperature K31 or a temperature lower than the first target temperature K31.

[0384] <Modification Example 2>

[0385] An example of a third mode M3 that further includes a process other than the first heating process and the second heating process will be described. For example, as an example of the third mode M3 that further includes a food material heating preparation process, a temperature adjustment process, and a grilling process, a "Japanese stewed hamburger steak" that is a cooking recipe mode included in the third mode M3 will be described. In addition, the "Japanese stewed hamburger steak" that is a cooking recipe mode is a cooking recipe mode suitable for cooking in which a hamburger steak (food material 81) that is not heated is put into the heating target 80, and after the food material 81 is cooked by grilling, a sauce (liquid food material 81) is further put into the food material 81 accommodated in the heating target 80, and the food material 81 is cooked by boiling.

[0386] Figure 27 is a graph that shows a curve indicating a relationship between a heating time of the heating target 80 and a temperature of the heating target 80 detected by the temperature sensor 6 and a curve indicating a relationship between the heating time of the heating target 80 and a heating state under the third mode M3 of the induction heating cooker 1A of the modified example 2.

[0387] The "Japanese stewed hamburger steak" that is a cooking recipe mode includes a food material heating preparation process, a temperature adjustment process, a grilling process (a first grilling process and a second grilling process), a boiling preparation process, a first heating process, and a second heating process. The boiling preparation process is a transition process that connects the grilling process and the first heating process. For example, the boiling preparation process is a process of heating the heating target 80 so that the temperature of the heating target 80 becomes a temperature that is lower than a predetermined temperature of the heating target 80 in the first heating process and is closer to the predetermined temperature of the heating target 80 in the first heating process.

[0388] In the modified example 2, the food material heating preparation process, the temperature adjustment process, the first grilling process, and the second grilling process correspond to the food material heating preparation process, the temperature adjustment process, the first grilling process, and the second grilling process in the second mode M2 of the embodiment 1. That is, the first heating sequence H41 to the third heating sequence H43 of the modified example 2 correspond to the first heating sequence H11 to the third heating sequence H13 in the second mode M2 of the embodiment 1. In addition, the first target temperature K41 and the threshold temperature K42 in the modified example 2 correspond to the first target temperature K11 and the threshold temperature K12a in the second mode M2 of the embodiment 1. The heating times T41 to T47 in the modified example 2 correspond to the heating times T11 to T17 in the second mode M2 of the embodiment 1. In the second grilling process of the second mode M2 of the embodiment 1, the controller 5 heats the heating target 80 with the target temperature of the temperature of the heating target 80 set to the second target temperature K12b, but in the second grilling process of the modified example 2, the controller 5 heats the heating target 80 with the target temperature of the heating target 80 set to the first target temperature K41.

[0389] In the modification example 2, the first heating process and the second heating process correspond to the first heating process and the second heating process in the third mode M3 of the embodiment 1. That is, the fifth heating sequence H45 and the sixth heating sequence H46 in the modification example 2 correspond to the first heating sequence H21 and the second heating sequence H22 in the third mode M3 of the embodiment 1. Further, the threshold temperature K43 and the second target temperature K44 in the modification example 2 correspond to the threshold temperature K21 and the target temperature K22 in the third mode M3 of the embodiment 1. The heating times T49 to T52 in the modification example 2 correspond to the heating times T21 to T24 in the third mode M3 of the embodiment 1.

[0390] In the modification example 2, the description repeated in the embodiment 1 is omitted.

[0391] In the second baking process, after the temperature of the heating target object 80 reaches the first target temperature K41, the controller 5 maintains the temperature of the heating target object 80 at the first target temperature K41. In the second baking process, the controller 5 maintains the temperature of the heating target object 80 at the first target temperature K41 for a predetermined time decided in advance by the third heating sequence H43. In addition, the user can know by the input and output interface device 8 when the predetermined time decided in advance by the third heating sequence H43 has elapsed. Further, the input and output interface device 8 can display, by the operation panel of the input and output interface device 8, that the time for maintaining the temperature of the heating target object 80 at the first target temperature K41 has elapsed when the predetermined time decided in advance by the third heating sequence H43 has elapsed. Further, the user can further put the food material 81 into the heating target object 80 after the predetermined time decided in advance by the third heating sequence H43 has elapsed.

[0392] Next, when it is detected that the food material 81 is further put into the heating target object 80 (T47), the controller 5 starts the cooking preparation process. For example, the controller 5 can detect that the food material 81 is put into the heating target object 80 by the fact that the temperature of the heating target object 80 decreases from the first target temperature K41 by the food material 81 being put into the heating target object 80.

[0393] The controller 5 switches the heating sequence to the fourth heating sequence H44 when the cooking preparation process is started (T47). In the cooking preparation process, the controller 5 heats the heating target object 80 according to the fourth heating sequence H44.

[0394] In the cooking preparation process, the controller 5 controls at least a part of the parameters of the current flowing through the plurality of coil members 10A to 10F according to the fourth heating sequence H44. The fourth heating sequence H44 includes a first heating state P1 and a second heating state P2.

[0395] The controller 5 switches the heating state based on the temperature of the heating target object 80 according to the fourth heating sequence H44. The controller 5 heats the heating target object 80 by the first heating state P1 from when the cooking preparation process starts (T47) to when the temperature of the heating target object 80 becomes the threshold temperature K43 or lower (T48) according to the fourth heating sequence H44. The controller 5 switches the heating state when the temperature of the heating target object 80 becomes the threshold temperature K43 or lower (T48). The controller 5 heats the heating target object 80 by the second heating state P2 from when the heating time T48 to when the cooking preparation process is completed (T49). The cooking preparation process can be completed when a predetermined time elapses from when the temperature of the heating target object 80 becomes the threshold temperature K43 or lower (T48) (T49). That is, the cooking preparation process can end according to the heating time of the heating target object 80, and the next process starts. Further, the fourth heating sequence H44 can be switched to the fifth heating sequence H45 according to the heating time of the heating target object 80.

[0396] The induction heating cooker 1A according to the modified example 2 can achieve the following effects.

[0397] The third mode M3 further has a food material heating preparation process, a temperature adjustment process, and a roasting process. The food material heating preparation process in the third mode M3 is a process of heating the heating target object 80 until the temperature of the heating target object 80 reaches the first target temperature K41. The temperature adjustment process is a process of maintaining the temperature of the heating target object 80 at the first target temperature K41 after the food material heating preparation process is completed. The roasting process is a process of heating the heating target object 80 by a different heating power from the heating power in the temperature adjustment process after the temperature adjustment process is completed. The controller 5 switches the plurality of heating sequences H0 according to the food material heating preparation process, the temperature adjustment process, or the roasting process.

[0398] According to such a structure, the induction heating cooker 1A can efficiently heat the heating target object 80. The controller 5 of the induction heating cooker 1A switches the plurality of heating sequences H0 according to the cooking mode, and thus can efficiently heat the heating target object 80 according to the cooking method of the food material 81.

[0399] The controller 5 switches the plurality of heating sequences H0 according to the heating time of the heating target object 80 in the cooking mode.

[0400] According to such a structure, the induction heating cooker 1A can heat the heating target object 80 at a heating time that matches the cooking method of the food material 81. For example, the fourth heating sequence H44 is completed after a predetermined heating time elapses and is switched to the fifth heating sequence H45, and thus the food material 81 accommodated in the heating target object 80 can be more efficiently heated.

[0401] Further, the cooking recipe mode of "Japanese-style stewed hamburger steak" is explained to include the cooking preparation process, but the cooking recipe mode of "Japanese-style stewed hamburger steak" can not include the cooking preparation process. For example, the first heating process can be started after the second cooking process is completed, upon detecting that the food material 81 is further put into the heating target object 80.

[0402] Further, the controller 5 can switch to the fourth heating sequence H44 when a predetermined heating time decided by the third heating sequence H43 elapses. That is, the controller 5 can end the second cooking process according to the heating time, and start the cooking preparation process as the next process of the second cooking process. For example, in a case where the temperature of the food material 81 put into the heating target object 80 is high, and even if the food material 81 is put into the heating target object 80, the temperature of the heating target object 80 does not decrease with respect to the first target temperature K41, the controller 5 can switch the heating sequence when a predetermined heating time elapses.

[0403] Further, the cooking preparation process is explained to be completed when a predetermined time elapses (T49) from when the temperature of the heating target object 80 becomes the threshold temperature K43 or less (T48), but is not limited thereto. For example, the controller 5 can maintain the temperature of the heating target object 80 at the threshold temperature K43 after the temperature of the heating target object 80 becomes the threshold temperature K43 or less, and complete the cooking preparation process when a predetermined time elapses. In addition, the controller 5 can control the magnitude of the current flowing through the plurality of coil members 10A to 10F according to the temperature difference between the temperature of the heating target object 80 detected by the temperature sensor 6 and the threshold temperature K43, thereby maintaining the temperature of the heating target object 80 at the threshold temperature K43.

[0404] As described above, the above-described embodiments are explained as an example of the technology disclosed in the present application. However, the technology in the present disclosure is not limited thereto, and can be applied to embodiments appropriately changed, replaced, added, omitted, and the like.

[0405] The present disclosure is fully described in connection with the preferred embodiments associated with the accompanying drawings, but various modifications, corrections are obvious to those skilled in the art. Such modifications, corrections should be understood to be included therein as long as they do not depart from the scope of the present application recited in the accompanying claims.

[0406] (Summary of Embodiments)

[0407] (1) The induction heating cooking appliance of the present disclosure is provided with a top plate, a coil unit, and a controller. The coil unit is disposed below the top plate. The controller controls heating of a heating target object by the coil unit. The coil unit is provided with a plurality of coil pieces disposed in a first heating region that heats the heating target object in plan view. The first heating region has a plurality of first coil arrangement regions defined by a first outer periphery line that defines an outer periphery of the first heating region and a plurality of first boundary lines that extend radially from the center of the first heating region toward the outer periphery in plan view. The plurality of coil pieces are disposed within the plurality of first coil arrangement regions in plan view. The controller can switch a plurality of heating states in which the local intensity distribution of heating of the heating target object is different, by flowing a current through all of the plurality of coil pieces while controlling at least a part of the parameters of the current flowing through each of the plurality of coil pieces. The controller has a plurality of heating sequences in which one or more of the plurality of heating states are combined. The controller acquires a cooking mode and switches the plurality of heating sequences according to the acquired cooking mode.

[0408] (2) In the induction heating cooking appliance of (1), the controller can acquire temperature information of the heating target object and switch the plurality of heating sequences according to the temperature information of the heating target object.

[0409] (3) In the induction heating cooking appliance of (1) or (2), the controller can switch the plurality of heating sequences according to the heating time of the heating target object in the cooking mode.

[0410] (4) In the induction heating cooking appliance of any one of (1) to (3), at least one of the plurality of heating sequences can include a first heating state and a second heating state in which the local intensity distribution of heating of the heating target object is different from that of the first heating state. At least one of the plurality of heating sequences can determine a prescribed order in which the first heating state and the second heating state are switched. The controller can switch the first heating state and the second heating state based on the prescribed order determined by at least one of the plurality of heating sequences.

[0411] (5) In the induction heating cooking appliance of any one of (1) to (4), the controller can switch the first heating state and the second heating state in the prescribed order according to the temperature of the heating target object or the heating time of the heating target object.

[0412] (6) In the induction heating cooker of any one of (1) to (5), the cooking mode can include a first mode in which deep-frying cooking is performed. The first mode can include a preheating process, a temperature adjustment process, and a load detection process. The preheating process can be a process of heating the heating target until the temperature of the heating target reaches a first target temperature. The temperature adjustment process can be a process of maintaining the temperature of the heating target at a second target temperature after the preheating process is completed. The load detection process can be a process of heating the heating target to which food is put, using a larger heating power than the heating power used in the temperature adjustment process, when it is detected that the food is put into the heating target. The controller can switch the plurality of heating sequences according to the plurality of processes of the first mode.

[0413] (7) In the induction heating cooker of (6), the controller can control at least a part of the parameters of the current flowing through each of the plurality of coil members according to a first heating sequence including a first heating state in the preheating process. The controller can control at least a part of the parameters of the current flowing through each of the plurality of coil members according to a second heating sequence in the load detection process. The second heating sequence can include a first heating state and a second heating state in which the local strength distribution of the heating of the heating target is different from that of the first heating state. The controller can switch the first heating state and the second heating state in the second heating sequence.

[0414] (8) In the induction heating cooker of (7), the controller can switch the first heating state and the second heating state at a predetermined time interval determined in advance by the second heating sequence.

[0415] (9) In the induction heating cooker of (7), in the first heating state in the first mode, the heating of the heating target on a region corresponding to adjacent portions of two adjacent coil members among the plurality of coil members can be stronger than the heating of the heating target on a region corresponding to portions along the first outer circumferential line of the two adjacent coil members, respectively. In the second heating state in the first mode, the heating of the heating target on a region corresponding to portions along the first outer circumferential line of the plurality of coil members can be stronger than the heating of the heating target on a region corresponding to a center of at least one coil member among the plurality of coil members.

[0416] (10) In the induction heating cooker of any one of (1) to (9), the cooking mode can include a second mode in which grilling cooking is performed. The second mode can include a food material heating preparation step, a temperature adjustment step, and a grilling step. The food material heating preparation step can be a step of heating the heating target until the temperature of the heating target reaches a first target temperature. The temperature adjustment step can be a step of maintaining the temperature of the heating target at the first target temperature after the food material heating preparation step is completed. The grilling step can be a step of heating the heating target using a heating power different from the heating power in the temperature adjustment step. The controller can switch the plurality of heating sequences according to the plurality of steps of the second mode.

[0417] (11) In the induction heating cooker of (10), the controller can control at least a part of the parameters of the current flowing through each of the plurality of coil members according to a first heating sequence including a first heating state in the food material heating preparation step. The controller can control at least a part of the parameters of the current flowing through each of the plurality of coil members according to a second heating sequence in the grilling step. The second heating sequence can include a second heating state and a third heating state in which the local strength distribution of heating the heating target is different from that of the second heating state. The controller can alternately switch the second heating state and the third heating state in the second heating sequence.

[0418] (12) In the induction heating cooker of (10), the grilling step can include a first grilling step and a second grilling step. The first grilling step can be a step of heating the heating target in a state in which a first surface of a food material having the first surface and a second surface opposite to the first surface is in contact with the heating target. The second grilling step can be a step of heating the heating target in a state in which the second surface of the food material is in contact with the heating target. The controller can control at least a part of the parameters of the current flowing through each of the plurality of coil members according to a first heating sequence including a first heating state in the food material heating preparation step. The controller can control at least a part of the parameters of the current flowing through each of the plurality of coil members according to a second heating sequence in the first grilling step. The second heating sequence can include a second heating state and a third heating state in which the local strength distribution of heating the heating target is different from that of the second heating state. The controller can control at least a part of the parameters of the current flowing through each of the plurality of coil members according to a third heating sequence in the second grilling step. The third heating sequence can include at least one heating state in which the local strength distribution of heating the heating target is different from that of the heating state included in the second heating sequence.

[0419] (13) In the induction heating cooker of any one of (1) to (13), the cooking mode can include a third mode in which cooking is performed. The third mode can include a first heating process in which the heating target is heated until the temperature of the heating target reaches a first target temperature, and a second heating process in which the temperature of the heating target is maintained at the first target temperature after the first heating process is completed. The controller can switch the plurality of heating sequences according to the plurality of processes of the third mode.

[0420] (14) In the induction heating cooker of (13), the controller can control at least a part of the parameters of the current flowing through each of the plurality of coil members according to a first heating sequence including a first heating state in the first heating process. The controller can control at least a part of the parameters of the current flowing through each of the plurality of coil members according to a second heating sequence in the second heating process. The second heating sequence can include a second heating state and a third heating state in which the local strength distribution of the heating of the heating target is different from that of the second heating state. The controller can alternately switch the second heating state and the third heating state according to the second heating sequence.

[0421] (15) In the induction heating cooker of (13), the third mode can further include a food material heating preparation process, a temperature adjustment process, and a roasting process. The food material heating preparation process can be a process in which the heating target is heated until the temperature of the heating target reaches a second target temperature. The temperature adjustment process can be a process in which the temperature of the heating target is maintained at the second target temperature until the food material heating preparation process is completed. The roasting process can be a process in which the heating target is heated using a different heating power than that used in the temperature adjustment process after the temperature adjustment process is completed. The controller can switch the plurality of heating sequences according to the plurality of processes.

[0422] (16) In the induction heating cooker of any one of (1) to (15), the coil unit can further have a second heating region that heats the heating target object when viewed in plan. A plurality of coil pieces that heat the heating target object can be arranged in the second heating region. The second heating region can be provided around the first heating region when viewed in plan and have a fan shape. The second heating region can have a plurality of second coil arrangement regions defined by a plurality of second boundary lines that extend radially from the center of the second heating region toward the outer periphery when viewed in plan and a second outer periphery line that defines the outer periphery of the arc portion of the second heating region. The plurality of coil pieces of the second heating region can be arranged in the plurality of second coil arrangement regions when viewed in plan. The controller can control at least a part of the parameters of the current flowing through each of the plurality of coil pieces in the third heating region including the first heating region and the second heating region while causing the current to flow through all of the plurality of coil pieces in the third heating region. The controller can switch a plurality of heating states in which the heating target object is heated with different local intensity distributions by controlling at least a part of the parameters of the current flowing through each of the plurality of coil pieces in the third heating region. The controller can further have a plurality of wide-range heating sequences in which one or more of the plurality of heating states of the third heating region are combined. The controller can switch the plurality of wide-range heating sequences according to the cooking mode.

[0423] (17) The method of controlling the induction heating cooker of the present disclosure is a method of controlling an induction heating cooker by a controller. The induction heating cooker has a top plate and a coil unit arranged below the top plate. The coil unit has a plurality of coil pieces arranged in a first heating region that heats a heating target object when viewed in plan. The first heating region has a plurality of first coil arrangement regions defined by a first outer periphery line that defines the outer periphery of the first heating region and a plurality of first boundary lines that extend radially from the center of the first heating region toward the outer periphery when viewed in plan. The plurality of coil pieces are arranged in the plurality of first coil arrangement regions when viewed in plan. The induction heating cooker can switch a plurality of heating states in which the heating target object is heated with different local intensity distributions by controlling at least a part of the parameters of the current flowing through each of the plurality of coil pieces while causing the current to flow through all of the plurality of coil pieces. The induction heating cooker can have a plurality of heating sequences in which one or more of the plurality of heating states are combined. The method of controlling the induction heating cooker includes a step of obtaining a cooking mode and a step of switching the plurality of heating sequences according to the cooking mode.

[0424] Industrial applicability

[0425] The induction heating cooker of the present disclosure can provide an induction heating cooker capable of efficiently heating a heating object, and thus can be appropriately utilized in such an industrial field.

Claims

1. An induction heating cooker, wherein the induction heating cooker comprises: a top plate; a coil unit disposed below the top plate; and a controller that controls heating of an object of heating by the coil unit, the coil unit comprises a plurality of coil pieces disposed in a first heating region that heats the object of heating when viewed in plan, the first heating region has a plurality of first coil arrangement regions defined by a first outer periphery line that defines an outer periphery of the first heating region and a plurality of first boundary lines that extend radially from a center of the first heating region toward the outer periphery when viewed in plan, the plurality of coil pieces are disposed in the plurality of first coil arrangement regions when viewed in plan, the controller is capable of switching a plurality of heating states in which local intensity distributions of heating of the object of heating are different, by flowing a current through all of the plurality of coil pieces while controlling at least a part of parameters of the current flowing through each of the plurality of coil pieces, the controller has a plurality of heating sequences in which one or more of the plurality of heating states are combined, the controller acquires a cooking mode and switches the plurality of heating sequences in accordance with the acquired cooking mode.

2. The induction heating cooker according to claim 1, wherein the controller acquires temperature information of the object of heating and switches the plurality of heating sequences based on the temperature information of the object of heating.

3. The induction heating cooker according to claim 1, wherein the controller switches the plurality of heating sequences in accordance with a heating time of the object of heating in the cooking mode.

4. The induction heating cooker according to claim 1, wherein at least one of the plurality of heating sequences includes a first heating state and a second heating state, and a prescribed order in which the first heating state and the second heating state are switched is determined in advance, wherein the second heating state has a different local intensity distribution of heating of the object of heating than the first heating state, the controller switches the first heating state and the second heating state based on the prescribed order determined by the at least one of the plurality of heating sequences.

5. The induction heating cooker according to claim 4, wherein the controller switches the first heating state and the second heating state in the prescribed order based on a temperature of the object of heating or a heating time of the object of heating.

6. The induction heating cooker according to claim 1, wherein the cooking mode includes a first mode in which deep-frying is performed, the first mode comprises: a preheating process in which the object of heating is heated until a temperature of the object of heating reaches a first target temperature; a temperature adjustment process in which the temperature of the object of heating is maintained at a second target temperature after the preheating process is completed; and a main heating process in which the object of heating is heated after the temperature adjustment process is completed. a load detection process of heating the heating target with a larger heating power than a heating power used in the temperature adjustment process when it is detected that food is put into the heating target, the controller switches the plurality of heating sequences in accordance with the plurality of processes of the first mode.

7. The induction heating cooker according to claim 6, wherein the controller controls at least a part of the parameters of the current flowing through each of the plurality of coil members in accordance with a first heating sequence including a first heating state in the preheating process, the controller controls at least a part of the parameters of the current flowing through each of the plurality of coil members in accordance with a second heating sequence including the first heating state and a second heating state different from the first heating state in terms of a distribution of heating of the heating target in the load detection process, the controller switches the first heating state and the second heating state in the second heating sequence.

8. The induction heating cooker according to claim 7, wherein the controller switches the first heating state and the second heating state at a predetermined time interval determined in advance by the second heating sequence.

9. The induction heating cooker according to claim 7, wherein in the first heating state, the heating target is heated more strongly on a region corresponding to adjacent portions of two adjacent coil members among the plurality of coil members than on a region corresponding to portions of the two adjacent coil members along the first outer circumference line, in the second heating state, the heating target is heated more strongly on a region corresponding to portions of the plurality of coil members along the first outer circumference line than on a region corresponding to a center of at least one coil member among the plurality of coil members.

10. The induction heating cooker according to claim 1, wherein the cooking mode includes a second mode in which grilling cooking is performed, the second mode includes: a food heating preparation process of heating the heating target until a temperature of the heating target reaches a first target temperature; a temperature adjustment process of maintaining the temperature of the heating target at the first target temperature after the food heating preparation process is completed; and a grilling process of heating the heating target with a heating power different from a heating power used in the temperature adjustment process when it is detected that food is put into the heating target, the controller switches the plurality of heating sequences in accordance with the plurality of processes of the second mode.

11. The induction heating cooker according to claim 10, wherein the controller controls at least a part of the parameters of the current flowing through each of the plurality of coil members in accordance with a first heating sequence including a first heating state in the food heating preparation process, ​ The controller controls at least a part of the parameters of the electric current flowing through each of the plurality of coil members in the second heating sequence including a first heating state and a second heating state, the second heating state being different from the first heating state in terms of a local strength distribution of heating the heating target, The controller alternately switches the first heating state and the second heating state in the second heating sequence.

12. The induction heating cooker according to claim 10, wherein The cooking process includes: a first cooking process in which the heating target is heated while a first surface of a food material is in contact with the heating target, the first surface having a first side and a second side opposite to the first side; and a second cooking process in which the heating target is heated while the second surface of the food material is in contact with the heating target. The controller controls at least a part of the parameters of the electric current flowing through each of the plurality of coil members in the food material heating preparation process according to a first heating sequence including a first heating state, The controller controls at least a part of the parameters of the electric current flowing through each of the plurality of coil members in the first cooking process according to a second heating sequence including the first heating state and a second heating state, the second heating state being different from the first heating state in terms of a local strength distribution of heating the heating target, The controller controls at least a part of the parameters of the electric current flowing through each of the plurality of coil members in the second cooking process according to a third heating sequence including at least one heating state, the at least one heating state being different from the heating state included in the second heating sequence in terms of a local strength distribution of heating the heating target.

13. The induction heating cooker according to claim 1, wherein The cooking mode includes a third mode in which cooking is performed, The third mode includes: a first heating process in which the heating target is heated until a temperature of the heating target reaches a first target temperature; and a second heating process in which the temperature of the heating target is maintained at the first target temperature after the first heating process is completed, The controller switches the plurality of heating sequences according to a plurality of processes of the third mode.

14. The induction heating cooker according to claim 13, wherein The controller controls at least a part of the parameters of the electric current flowing through each of the plurality of coil members in the first heating process according to a first heating sequence including a first heating state, The controller controls at least a part of the parameters of the electric current flowing through each of the plurality of coil members in the second heating process according to a second heating sequence including a second heating state and a third heating state, the third heating state being different from the second heating state in terms of a local strength distribution of heating the heating target, ​ The controller switches the second heating state and the third heating state according to the second heating sequence.

15. The induction heating cooker according to claim 13, wherein, The third mode further has: a food material heating preparation step of heating the heating target until the temperature of the heating target reaches a second target temperature; a temperature adjustment step of maintaining the temperature of the heating target at the second target temperature after the food material heating preparation step is completed; and a roasting step of heating the heating target using a different heating power from the heating power used in the temperature adjustment step after the temperature adjustment step is completed, The controller switches the plurality of heating sequences according to the plurality of steps.

16. The induction heating cooker according to claim 1, wherein, The coil unit further has a second heating region that heats the heating target when viewed from above, a plurality of coil pieces that heat the heating target are arranged in the second heating region, The second heating region is provided around the first heating region when viewed from above and has a fan shape, The second heating region has a plurality of second coil arrangement regions that are demarcated by a plurality of second boundary lines that extend radially from the center of the second heating region toward the outer periphery of an arc portion of the second heating region and a second outer periphery line that demarcates the outer periphery of the arc portion of the second heating region when viewed from above, The plurality of coil pieces of the second heating region are arranged in the plurality of second coil arrangement regions of the second heating region when viewed from above, The controller is capable of switching a plurality of heating states in which the heating of the heating target is distributed differently in terms of strength and weakness in the third heating region that includes the first heating region and the second heating region by causing a current to flow through all of the plurality of coil pieces in the third heating region while controlling at least a part of the parameters of the current flowing through each of the plurality of coil pieces in the third heating region, The controller further has a plurality of wide-range heating sequences that are combinations of one or more of the plurality of heating states of the third heating region, The controller switches the plurality of wide-range heating sequences according to the cooking mode.

17. A control method of an induction heating cooker, which is a method of controlling an induction heating cooker by a controller, wherein The induction heating cooker has: a top plate; and a coil unit arranged below the top plate, The coil unit has a plurality of coil pieces arranged in a first heating region that heats a heating target when viewed from above, The first heating region has a plurality of first coil arrangement regions that are demarcated by a first outer periphery line that demarcates the outer periphery of the first heating region and a plurality of first boundary lines that extend radially from the center of the first heating region toward the outer periphery when viewed from above, The plurality of coil pieces are arranged in the plurality of first coil arrangement regions when viewed from above, The induction heating cooker controls at least a part of parameters of the electric current flowing through each of the plurality of coil members while causing the electric current to flow through all of the plurality of coil members, whereby a plurality of heating states in which the local intensity distribution of heating of the heating target differs can be switched, The induction heating cooker has a plurality of heating sequences in which one or more of the plurality of heating states are combined, A method of controlling the induction heating cooker includes: a step of obtaining a cooking mode; and a step of switching the plurality of heating sequences according to the cooking mode.

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