Control circuit and electromagnetic heating cooking utensil

Abstract

The utility model discloses a control circuit and an electromagnetic heating cooking utensil. The control circuit is used for the electromagnetic heating cooking utensil, the electromagnetic heating cooking utensil comprises a wire harness assembly, the wire harness assembly comprises an enameled wire harness, the enameled wire harness comprises multiple strands of enameled wires, the enameled wire harness is wound into at least one coil, and the coil is used for generating an alternating magnetic field under power supply of a first power supply to implement electromagnetic heating. The control circuit comprises a first connection point, a second connection point, a first branch and a selection switch. The first connection point is used for connecting the first end of the wire harness assembly and the first power supply; the second connection point is used for connecting the second end of the wire harness assembly and the switch element; the first branch circuit is used for detecting whether the wire harness assembly is broken or not, and the first branch circuit is used for being connected to a first connection point; the selection switch is used for enabling the first connection point to be selectively connected to the first power supply or the first branch. The control circuit can switch the working state and the detection state of the wire harness assembly, and the safety of the electromagnetic heating cooking utensil is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cooking appliances, in particular to a control circuit for an electromagnetic heating cooking appliance and an electromagnetic heating cooking appliance employing the control circuit. BACKGROUND

[0002] IH cooking appliances are household appliances that directly heat cookware through electromagnetic induction principle. Common IH cooking appliances include induction cookers and electric rice cookers.

[0003] A coil for generating an electromagnetic field is an important component for implementing electromagnetic heating function. The coil is usually formed by winding a plurality of enameled wires. If the enameled wires are damaged, it may cause the coil to overheat and catch fire, which poses a serious safety hazard.

[0004] Therefore, it is necessary to provide an IH heating cooking appliance to at least partially solve the above problems. SUMMARY

[0005] A series of simplified concepts are introduced in the summary section, which will be further described in detail in the detailed description section. The summary section of the present application does not mean to attempt to limit the key features and essential technical features of the claimed technical solutions, nor to determine the protection scope of the claimed technical solutions.

[0006] To at least partially solve the above problems, the first aspect of the present application provides a control circuit for an electromagnetic heating cooking appliance, the electromagnetic heating cooking appliance comprising a wire harness assembly, the wire harness assembly comprising an enameled wire harness, the enameled wire harness comprising a plurality of enameled wires, the enameled wire harness being wound into at least one coil, the coil being configured to generate an alternating magnetic field under the power supply of a first power source to implement electromagnetic heating, the control circuit comprising:

[0007] a first connection point for connecting a first end of the wire harness assembly and the first power source;

[0008] a second connection point for connecting a second end of the wire harness assembly and a switching element;

[0009] a first branch for detecting whether the wire harness assembly is broken, the first branch being configured to be connected to the first connection point; and

[0010] a selection switch configured to selectively connect the first connection point to the first power source or the first branch.

[0011] According to the application, when the first connection point is connected to the first power supply, the coil can generate an alternating magnetic field, and when the first connection point is connected to the first branch, whether the wire harness assembly is broken can be detected. The control circuit switches the working state and the detection state of the wire harness assembly by selecting the switch, thereby improving the safety of the cooking appliance.

[0012] Optionally, the switch element comprises a power switch tube, a collector of the power switch tube is connected to the second connection point, and an emitter of the power switch tube is grounded.

[0013] According to the application, the energy storage and oscillation of the electromagnetic oscillation circuit are controlled by the power switch tube, and the control is simple, stable in performance, and high in safety.

[0014] Optionally, the first branch comprises a first resistor, a first end of the first resistor is connected to the direct-current power supply, and a second end of the first resistor is used for connecting the first connection point.

[0015] The selection switch is used for selectively connecting the first connection point to the first power supply or the second end of the first resistor.

[0016] According to the application, the resistance of the wire harness assembly is detected by means of resistance series voltage division, and then it is determined whether the wire harness assembly is damaged, and the detection method is simple and easy to implement.

[0017] Optionally, the first resistor is configured as a constantan resistor.

[0018] According to the application, the first resistor is configured as a high-precision resistor, which is conducive to ensuring detection accuracy.

[0019] Optionally, the resistance value of the first resistor is 0.2-4Ω.

[0020] Further, the resistance value of the first resistor is comparable to the resistance value of the wire harness assembly in the unbroken state.

[0021] According to the application, the resistance of the first resistor and the wire harness assembly is of the same order of magnitude, which is conducive to ensuring detection accuracy.

[0022] Optionally, the selection switch is configured as a two-way exclusive switch, a first way of the exclusive switch is used for connecting the first connection point and the first power supply, and a second way of the exclusive switch is used for connecting the first connection point and the first branch.

[0023] According to the application, the working state and the detection state of the enameled wire harness are switched by the exclusive switch.

[0024] The second aspect of the application provides an electromagnetic heating cooking appliance, which comprises:

[0025] A wire harness assembly comprising a lacquered wire harness including a plurality of lacquered wires, the lacquered wire harness being wound into at least one coil, the coil being configured to generate an alternating magnetic field under power supply of a first power supply;

[0026] The control circuit according to any one of the first aspect, wherein the first connection point is connected to a first end of the wire harness assembly and the first power supply, and the second connection point is connected to a second end of the wire harness assembly and a switching element; and

[0027] A cooking container made of a ferromagnetic material, configured to be placed within a magnetically inducible area of the coil.

[0028] According to the present application, when the wire harness assembly is connected to the first power supply, the coil can perform a heating function, and when the wire harness assembly is connected to the first branch, whether the wire harness assembly is broken can be detected. The electromagnetic heating cooking appliance has good safety.

[0029] Optionally, the electromagnetic heating cooking appliance further comprises an electromagnetic heating module, the electromagnetic heating module comprising the coil, the electromagnetic heating module being configured such that the alternating magnetic field is non-uniformly distributed along a circumferential direction of the electromagnetic heating module,

[0030] The cooking container is configured to be placed within a magnetically inducible area of the coil substantially coaxially with the electromagnetic heating module,

[0031] The electromagnetic heating cooking appliance is configured such that the coil is rotatable about the coaxial axis relative to the cooking container to make the alternating magnetic field rotatable about the coaxial axis relative to the cooking container.

[0032] According to the present application, the electromagnetic heating cooking appliance has the characteristics of multi-point heat source rotating heating. During the rotation of the heat source, the coil rotates, thereby increasing the possibility of the wire harness assembly being pulled and scratched, i.e., the risk of the wire harness assembly being broken increases, and the process of detecting whether the wire harness assembly is broken is more necessary.

[0033] Optionally, the electromagnetic heating module further comprises a coil disc, the coil being arranged on the coil disc, a winding center of the coil being offset from a central axis of the coil disc, the central axis of the coil disc being a central axis of the electromagnetic heating module,

[0034] The electromagnetic heating cooking appliance is configured such that the coil disc is rotatable about the coaxial axis relative to the cooking container.

[0035] According to the present application, the coil is arranged on the coil disc, which is conducive to the stable support of the coil.

[0036] Optionally, the electromagnetic heating module comprises a plurality of the coils, all the coils are arranged at intervals along the circumferential direction of the coil disc on the coil disc.

[0037] According to the present application, the electromagnetic heating module realizes the non-uniform magnetic field along the circumferential direction of the coil disc by deviating the winding center of the coil from the central axis of the coil disc.

[0038] Optionally, all the coils are respectively coiled by the same wire bundle.

[0039] According to the present application, all the coils are connected in series so as to work at the same time, the control is simpler, and the wire bundle assembly breaking detection process is also simple (without detecting the enameled wire of each coil respectively).

[0040] Optionally,

[0041] The coil is arranged on the side of the coil disc which is away from the cooking container; and / or

[0042] The axial section of the coil disc comprises a C-shaped structure.

[0043] According to the present application, the coil is arranged on the side of the coil disc which is away from the cooking container, so as to hide the wire bundle assembly and protect the wire bundle assembly. The shape of the coil disc is matched with the bottom shape of the cooking container, which is beneficial to improve the efficacy of the electromagnetic field.

[0044] Optionally, the wire bundle assembly further comprises a first main cable and a second main cable, the first main cable and the second main cable are connected in series at two ends of the wire bundle respectively, the first main cable provides a first end of the wire bundle assembly, and the second main cable provides a second end of the wire bundle assembly.

[0045] According to the present application, the wire bundle is mainly used to form the coil, and the two ends of the wire bundle are connected to the control circuit board through the cable, so as to save the length of the wire bundle. BRIEF DESCRIPTION OF DRAWINGS

[0046] The following drawings for the present application are hereby incorporated into the present application as a part thereof for understanding the present application. The drawings in the present application show the representative embodiments of the present application, which are used to explain the principles of the present application, but not to limit the present application.

[0047] In the drawings:

[0048] Figure 1 is a side view schematic diagram of the electromagnetic heating cooking appliance according to the specific embodiment of the present application;

[0049] Figure 2 is Figure 1 is an enlarged schematic diagram of part A in

[0050] Figure 3 isFigure 1 a top perspective view of the electromagnetic heating module in

[0051] Figure 4 a bottom perspective view of the electromagnetic heating module in Figure 1 a bottom perspective view of the electromagnetic heating module in

[0052] Figure 5 a top perspective view of the electromagnetic heating module in Figure 1 a top perspective view of the electromagnetic heating module in

[0053] Figure 6 a bottom perspective view of the electromagnetic heating module in Figure 1 a bottom perspective view of the electromagnetic heating module in

[0054] Figure 7 a perspective exploded view of the electromagnetic heating module in Figure 1 a perspective exploded view of the electromagnetic heating module in

[0055] Figure 8 a circuit schematic of the control circuit of the electromagnetic heating cooking appliance shown in Figure 1 a circuit schematic of the control circuit of the electromagnetic heating cooking appliance shown in

[0056] Figure 9 a working flow schematic of the electromagnetic heating cooking appliance shown in Figure 1 a working flow schematic of the electromagnetic heating cooking appliance shown in

[0057] BRIEF DESCRIPTION OF DRAWINGS

[0058] 100: cooking appliance

[0059] 200: cover body

[0060] 300: cooking container

[0061] 400: control circuit

[0062] 401: control device

[0063] 402: resonance capacitor

[0064] 403: switching element

[0065] 410: first branch

[0066] 411: first resistor

[0067] 412: first resistor first end

[0068] 413: first resistor second end

[0069] 420: selection switch

[0070] 431: first connection point

[0071] 432: second connection point

[0072] 441: first power supply

[0073] 442: DC power supply

[0074] 500: base

[0075] 600: electromagnetic heating module

[0076] 603: coil pan

[0077] 604: rotary substructure

[0078] 605: temperature sensor

[0079] 606: coil

[0080] 607: bobbin

[0081] 608: magnetic conductor

[0082] 609: first gear

[0083] 610: mounting bracket

[0084] 611: second gear

[0085] 612: magnetic shield

[0086] 613: motor

[0087] 614: first main cable

[0088] 614A: first end of first main cable

[0089] 614B: second end of first main cable

[0090] 615: second main cable

[0091] 615A: first end of second main cable

[0092] 615B: second end of second main cable

[0093] 620: line card

[0094] 626: temperature sensor cable

[0095] 631: spring

[0096] 635: coil pan barrel

[0097] 637: coil-to-coil connection wire bundle

[0098] 641: first surface

[0099] 642: second surface

[0100] 643: third surface

[0101] 644: wire passage hole

[0102] 645: mounting bracket cylindrical portion

[0103] 660: wire harness assembly

[0104] 661: Harness assembly first end

[0105] 662: Harness assembly second end

[0106] 700: pot body

[0107] 701: middle plate

[0108] 702: connecting column

[0109] 703: inner cylinder

[0110] 705: accommodating cavity

[0111] 707: housing

[0112] P1: electromagnetic heating module center axis

[0113] P2: cooking container center axis

[0114] P3: coil disc center axis DETAILED DESCRIPTION

[0115] In the following description, numerous specific details are given to provide a thorough understanding of the application. However, it will be apparent that the application can be practiced without one or more of the specific details. In other instances, well-known techniques have not been described in order to avoid obscuring the application.

[0116] For a thorough understanding of the application, reference is made to the following description taken in conjunction with the accompanying drawings. It is apparent that the application can be practiced without one or more of the specific details set forth in this description. In other instances, well-known techniques have not been described in order to avoid obscuring the application.

[0117] The ordinal numbers such as "first" and "second" cited in the present application are merely identification and have no other meaning, such as a specific order, etc. Also, for example, the term "first component" itself does not imply the existence of a "second component", and the term "second component" itself does not imply the existence of a "first component". The use of the words "first", "second", and "third" and the like does not indicate any order, and these words can be interpreted as names.

[0118] It should be noted that the terms "upper", "lower", "front", "back", "left", "right", "inner", "outer", and similar expressions used in the present application are for illustrative purposes only and are not limiting.

[0119] In the present document, "equal", "same", and the like are not strictly mathematical and / or geometric limitations, but also include tolerances that can be understood by a person skilled in the art and that are allowed for manufacturing or use, etc.

[0120] Unless otherwise stated, numerical ranges in the present document include the entire range between the two endpoints, but also several sub-ranges contained therein.

[0121] The present application provides a control circuit for an electromagnetic heating cooking appliance and an electromagnetic heating cooking appliance employing the control circuit.

[0122] Now, exemplary embodiments according to the present application will be described in more detail with reference to the accompanying drawings.

[0123] As shown in Figure 1 The electromagnetic induction heating cooking appliance 100 according to the specific embodiment of the present application includes a pot body 700, a cover body 200, and a base 500. The pot body 700 is used for cooking heating, for example, including a cooking container 300 for containing food materials and an electromagnetic heating module 600 (IH heating module 600) for heating the cooking container 300. The cooking container 300 is removably arranged in a receiving cavity 705 of the pot body 700. The IH heating module 600 is arranged, for example, at the bottom of the receiving cavity 705. Thus, the cooking container 300 is placed in the magnetically inductive area of the electromagnetic heating module 600 separably from the electromagnetic heating module 600. The cover body 200 is connected with the pot body 700 and is used for covering the pot body 700. For example, the cover body 200 can be flipped up to open the pot body 700 and flipped down to close the pot body 700. The base 500 is connected with the pot body 700. The base 500 is located at the bottom of the cooking appliance 100 and is used for supporting the pot body 700.

[0124] The pot body 700 includes, for example, a shell 707, a middle plate 701, and an inner cylinder 703. The middle plate 701 is located inside the shell 707, at the top of the pot body 700, forming at least the upper surface of the pot body 700. The inner cylinder 703 is connected to the middle plate 701 and extends vertically. The base 500 is connected, for example, to the shell 707 and / or the middle plate 701. More broadly, the shell 707 and the base 500 enclose a receiving cavity 705, which is separated by the middle plate 701 and the inner cylinder 703. The shell 707, base 500, middle plate 701, and inner cylinder 703 all provide walls for the receiving cavity 705. The space between the middle plate 701 and the shell 707 can be used to mount components of the pot body 700, such as a fan, circuit board, etc. The interior of the inner cylinder 703 is used to house the cooking container 300. The inner cylinder 703 surrounds the cooking container 300. By incorporating the inner cylinder 703, the heat generated by the cooking container 300 is reflected back to the cooking container 300, preventing heat loss and overheating of the pot body 700. This improves both the heat retention of the cooking container 300 and the safety of the cooking appliance 100. The inner cylinder 703 can be understood as a side wall of the receiving cavity 705. The base 500 provides the bottom wall of the receiving cavity 705.

[0125] The electromagnetic heating module 600 has a central axis P1, and the magnetic field strength of the alternating magnetic field generated by the electromagnetic heating module 600 is non-uniformly distributed along the circumferential direction of the electromagnetic heating module. The cooking container 300 has a central axis P2. The cooking container 300 is generally in the shape of a body of revolution about the central axis P2 (e.g., with a circular cross-section). The cooking container 300 is used to be disposed within the magnetically inductive region of the electromagnetic heating module 600, for example, it is disposed detachably from the electromagnetic heating module within this magnetically inductive region. When the cooking container 300 is placed in the receiving cavity 705, the central axis P2 of the cooking container coincides with or substantially coincides with the central axis P1 of the electromagnetic heating module. Thus, the alternating magnetic field of the electromagnetic heating module 600 is non-uniformly distributed along the circumference of the cooking container 300.

[0126] The cooking appliance 100 is configured such that at least a portion of the electromagnetic heating module 600 can rotate relative to the cooking container 300, so that the alternating magnetic field of the electromagnetic heating module 600 and the cooking container 300 rotate relative to each other, thereby allowing the cooking container 300 to be heated evenly.

[0127] For example, in the illustrated embodiment, the cooking appliance 100 is configured such that at least a portion of the electromagnetic heating module 600 is rotatable relative to the cooking container 300 about the central axis P1 of the electromagnetic heating module.

[0128] Specifically, such as Figures 2 to 7As shown, the electromagnetic heating module 600 comprises, for example, a coil disc 603, at least one electromagnetic coil 606, a mounting frame 610, a transmission device and a driving device. Among them, the coil disc 603 is rotatable, specifically rotatable around the electromagnetic heating module center axis P1, which is also the center axis P3 of the coil disc 603 for example. The coil disc 603 is in a disc shape for example, and the shape is adapted to the bottom shape of the cooking container 300. The electromagnetic coil 606 is arranged on the coil disc 603, for example, on the bottom surface of the coil disc 603, so as to be driven to rotate by the coil disc 603. The electromagnetic coil 606 can generate the alternating magnetic field described above after being powered, so as to generate electromagnetic induction with the cooking container 300, so that the cooking container 300 is heated, and then the food in the cooking container 300 is heated. The coil disc 603 is arranged on the mounting frame 610 and can rotate relative to the mounting frame 610 around the coil disc center axis P3. The mounting frame 610 is a component for supporting various functional components in the electromagnetic heating module 600, for example, a cavity wall (such as the inner cylinder 703 or the base 500) for detachably connecting to the accommodation cavity 705. The mounting frame 610 is constructed as a basin for example. The driving device is arranged on the mounting frame 610 and is used to provide a driving force for rotating the coil disc 603. The transmission device connects the coil disc 603 and the driving device, so that the driving device drives the coil disc 603 to rotate through the transmission device.

[0129] The axial direction of the coil disc 603 is also the axial direction of the electromagnetic heating module 600. The circumferential direction of the coil disc 603 is also the circumferential direction of the electromagnetic heating module 600. The radial direction of the coil disc 603 is also the radial direction of the electromagnetic heating module 600. In actual use of the cooking appliance 100, the axial direction of the coil disc 603 is the up-down direction.

[0130] The electromagnetic heating module 600 as a whole can be mounted to the cavity wall of the accommodation cavity 705 by means of the mounting frame 610, so that the electromagnetic heating module can be pre-assembled as a whole first, and then mounted in the accommodation cavity 705. For example, the mounting frame 610 is detachably connected to the inner cylinder 703. In this way, it can be avoided to install the scattered components one by one in the accommodation cavity 705, for example, to the base 500, to avoid the influence of the installation precision of the installation site components, to make the installation precision between the plurality of components of the electromagnetic heating module 600 higher, to facilitate the assembly in the cooking appliance 100, to ensure the normal work and cooking effect of the cooking appliance 100, and to improve the user experience.

[0131] For example, as shown in FIG. 6, the electromagnetic heating module 600 is mounted in the accommodation cavity 705 through the mounting frame 610, and the coil disc 603 is arranged in the accommodation cavity 705 and is rotatable around the coil disc center axis P3. Figure 5As shown, the electromagnetic coil 606 is arranged non-concentrically with the coil disc 603. "Non-concentric" means that the spiral center of the winding of the electromagnetic coil 606 is not collinear with the central axis of the coil disc 603, i.e. the winding center of the electromagnetic coil 606 is offset from the central axis P3 of the coil disc. For example, the electromagnetic heating module 600 includes only one electromagnetic coil 606, and the winding center of the electromagnetic coil 606 is offset from the central axis of the coil disc 603. Alternatively, the electromagnetic heating module 600 includes at least two electromagnetic coils 606, and all the electromagnetic coils 606 are arranged at intervals along the circumferential direction of the electromagnetic heating module 600. For example, the electromagnetic heating module 600 includes N electromagnetic coils 606, and all the electromagnetic coils 606 are arranged at equal intervals along the circumferential direction of the electromagnetic heating module 600, where N is a natural number greater than or equal to 2. Preferably, N is less than or equal to 6. In the illustrated embodiment, the electromagnetic heating module 600 includes three electromagnetic coils 606, and all the electromagnetic coils 606 are arranged at equal intervals (120 degrees of circumferential angle) along the circumferential direction of the electromagnetic heating module 600.

[0132] In this context, all the electromagnetic coils 606 arranged at equal intervals along the circumferential direction of the electromagnetic heating module 600 can be understood as meaning that the center point of each electromagnetic coil 606 is on the same circle with a point on the axis P1 as the center, and the center points of all the electromagnetic coils 606 are distributed at equal intervals on the circle, and the coil disc 603 and all the electromagnetic coils 606 form a rotationally symmetric structure with the axis P1 as the center of rotational symmetry and 360 / N degrees as the rotation angle.

[0133] The number of electromagnetic coils 606 is set according to the electromagnetic heating power requirement. The plurality of electromagnetic coils 606 can be in a series relationship, for example, formed by one enameled wire bundle 637 being wound (coiled) respectively, so that the plurality of coils 606 work simultaneously. In other words, part of the enameled wire bundle 637 is coiled into the coil 606, which is used as the inductance in the LC oscillation circuit. The other part of the enameled wire bundle 637 forms a connecting wire between two coils 606 or a lead wire for connection with other components. Of course, each electromagnetic coil 606 can also be coiled by a respective enameled wire bundle, so as to work independently. The enameled wire bundle 637 includes a plurality of enameled wires, i.e. a plurality of enameled wires are connected in parallel to form the enameled wire bundle 637. The metal wire in the enameled wire is, for example, a copper wire or a copper-clad aluminum wire.

[0134] At the position of the coil 606, the magnetic field strength is strong, and the heating effect is obvious; at the position between the two coils 606, the magnetic field strength is weak, and the heating effect is not obvious. The rotation of the coil disc 603 around the coil disc center axis P3 relative to the mounting frame 610 causes the alternating magnetic field of the coil 606 to rotate around the coil disc center axis P3 relative to the mounting frame 610. By setting the non-concentric coil, the multi-point heat source rotating heating effect of the cooking utensil 100 can be realized, so as to realize the variable heating convection form, and the complex and variable convection rolling form and rolling effect in the cooking container 300 can be realized, so that the food is heated more uniformly, and the adverse phenomenon of partial rice being overcooked or dry after cooking is improved.

[0135] As shown in Figure 2 , the axial section of the coil disc 603 includes a C-shaped structure, and the cooking container 300 is located inside the C-shaped structure, so that the coil disc 603 conforms to the shape of the bottom of the cooking container 300, reduces the distance between the alternating magnetic field and the cooking container 300, and can make the alternating magnetic field better act on the cooking container 300, thereby improving the heating efficiency. The coil 606 is arranged on the side of the coil disc 603 facing the mounting frame 610 to avoid being exposed in the accommodating cavity 705. The coil 606 is located outside the C-shaped structure.

[0136] Optionally, as shown in Figure 2 and Figure 7 , the electromagnetic heating module 600 further comprises a bobbin 607, and the bobbin 607 is arranged on the bottom surface of the coil disc 603. The bobbin 607 is arranged corresponding to the electromagnetic coil 606, and the electromagnetic coil 606 is arranged on the bobbin 607, that is, is coiled on the bobbin 607. The bobbin 607 is constructed as a sandwich structure, for example, and a winding column is arranged at the center of the sandwich, and the enameled wire of the coil 606 is coiled in a disc shape in the sandwich around the winding column. The bobbin 607 and the coil disc 603 can be connected by screws. By arranging the electromagnetic coil 606 in the coiled state in the bobbin 607, the electromagnetic coil 606 can be easily assembled on the coil disc 603, and the electromagnetic coil 606 can also be effectively prevented from being scattered, thereby improving the stability of the electromagnetic coil 606 itself.

[0137] Optionally, as shown in Figure 2 and Figure 7As shown, the electromagnetic heating module 600 further comprises at least one magnetic conducting member 608, which is arranged on the bottom surface of the bobbin 607 and corresponds to the electromagnetic coil 606, and can guide the electromagnetic field generated by the electromagnetic coil 606 to the cooking container 300 when the electromagnetic coil 606 is powered. The magnetic conducting member and the bobbin 607 can be fixed by clamping. In the embodiment shown, a plurality of magnetic conducting members 608 are arranged corresponding to each electromagnetic coil 606. The magnetic conducting member 608 is configured as a long strip of magnetic conducting strips, for example, and a plurality of magnetic conducting strips are distributed at equal intervals along the circumferential direction of the coil 606, forming a radial star shape. The magnetic conducting member 608 can also be configured as a ring-shaped magnetic conducting strip. By arranging the magnetic conducting member 608 corresponding to the electromagnetic coil 606, the magnetic field generated by the electromagnetic coil 606 can be guided to act on the cooking container 300 of the cooking appliance 100, thereby improving the heating efficiency.

[0138] Optionally, as shown in Figure 2 and Figures 5 to 7 The driving device of the electromagnetic heating module 600 comprises a motor 613. The motor 613 can be a stepper motor, which is used to provide a driving force for rotating the coil disc 603. Through rotation control of the stepper motor and transmission of the transmission device, the coil disc 603 can be rotated in various modes such as forward and reverse rotation, intermittent rotation, and stepless speed regulation. Preferably, the electromagnetic heating module 600 further comprises a magnetic shield 612 covering the motor 613, which is used to shield electromagnetic interference between the motor 613 and the electromagnetic coil 606. The magnetic shield 612 can be made of aluminum, copper or other materials with magnetic shielding function.

[0139] Optionally, the transmission device of the electromagnetic heating module 600 comprises a first gear 609 and a second gear 611. The first gear 609 is coaxially connected with the coil disc 603. The second gear 611 is connected with the output shaft of the motor 613 and is in meshing transmission with the first gear 609. The first gear 609 and / or the second gear 611 can be in a hollow shape, i.e. provided with weight-reducing holes, which can reduce the weight of the product. By using a gear pair, it is convenient to arrange in a very small space, and the driving force of the motor 613 can be transmitted to the coil disc 603 with a plurality of preset transmission ratios.

[0140] Preferably, the first gear 609 and the second gear 611 are non-metal gears. Specifically, gears made of plastic materials such as POM, GFPP, PBT, PA66, etc. can be used, and POM material is preferred in the embodiment. Since the gear pair is close to the coil, by setting the gear pair as a non-metal gear, electromagnetic induction with the coil can be avoided.

[0141] Optionally, the gear ratio of the second gear 611 to the first gear 609 is any one of 1:1, 1:2, 1:3 and 1:4. Considering the product space layout, the gear ratio is preferably designed to be 1:3, which facilitates the speed regulation of the stepper motor and the control of the rotation angle. For example, the transmission result makes the coil disc 603 rotate at a speed range of 0.1 r / min to 10 r / min. Preferably, the rotation speed is 1 r / min.

[0142] Optionally, as shown in Figure 2 and Figure 7 The substantially central part of the coil disc 603 is provided with a coil disc cylindrical part 635 protruding towards the mounting frame 610 in the axial direction of the coil disc 603, and the mounting frame 610 is provided with a mounting frame cylindrical part 645 protruding towards the coil disc 603 in the axial direction of the coil disc 603. The cooking utensil 100 is configured such that the coil disc cylindrical part 635 and the mounting frame cylindrical part 645 are adapted and rotationally connected, so that the coil disc cylindrical part 635 is rotatable relative to the mounting frame cylindrical part 645 about the coil disc center axis P3. Thus, the coil disc 603 is rotatable relative to the mounting frame 610 about the coil disc center axis P3.

[0143] In particular, the cooking utensil 100 is configured such that one of the mounting frame cylindrical part 645 and the coil disc cylindrical part 635 is at least partially located in the other of the mounting frame cylindrical part 645 and the coil disc cylindrical part 635, and the coil disc cylindrical part 635 and the mounting frame cylindrical part 645 are connected through the revolute pair structure 604, wherein the axis of the revolute pair structure 604 coincides with the coil disc center axis P3. The revolute pair structure 604 is, for example, a bearing. The coil disc cylindrical part 635 and the mounting frame cylindrical part 645 are, for example, cylinders, the two cylinders are nested, the axial directions of the two cylinders are both the axial direction of the coil disc 603, and the bearing is located between the two cylinders and tightly fits with the two cylinders, respectively. By providing the revolute pair structure 604 in the middle of the mounting frame 610 to support the rotation of the coil disc 603, the stability of the rotation of the coil disc 603 is improved, and eccentric rotation is avoided, which affects the cooperation between mechanisms.

[0144] The revolute pair structure 604 can be configured as a rolling revolute pair structure or a sliding revolute pair structure. Optionally, the revolute pair structure 604 is made of a non-metallic material, for example, a non-metallic bearing, which can be made of a plastic material, a ceramic material or other non-metallic materials. Since the revolute pair structure 604 is close to the coil, by setting the revolute pair structure 604 as a non-metallic component, electromagnetic induction with the coil 606 can be avoided.

[0145] In the illustrated embodiment, the coil disc cylindrical portion 635 is outside, and the mounting frame cylindrical portion 645 is inside. Of course, it can also be that the coil disc cylindrical portion 635 is inside, and the mounting frame cylindrical portion 645 is outside. The first gear 609 can be sleeved on the outer peripheral surface of the coil disc cylindrical portion 635 of the coil disc 603, and the two are in transmission through a key. Alternatively, the coil disc 603 can be integrally injection molded with the first gear 609.

[0146] Preferably, as shown in Figure 2 the outer peripheral surface of the one inside of the mounting frame cylindrical portion 645 and the coil disc cylindrical portion 635 is provided with a first surface 641 extending in the radial direction, and the inner peripheral surface of the other of the mounting frame cylindrical portion 645 and the coil disc cylindrical portion 635 is provided with a second surface 642 extending in the radial direction. The first surface 641 and the second surface 642 are spaced apart in the axial direction of the coil disc 603. The revolute pair structure 604 is located between the first surface 641 and the second surface 642, so that the revolute pair structure 604 is limited in the axial direction.

[0147] Optionally, as shown in Figure 2 and Figure 7 The electromagnetic heating module 600 further comprises a temperature sensor 605. The top of the temperature sensor 605 passes through the coil disc 603 to be able to elastically contact the cooking container 300 of the cooking utensil 100. The temperature sensor 605 is arranged in the coil disc cylindrical portion 635. The temperature sensor 605 can adopt an NTC type temperature sensor. The electromagnetic heating module 600 further comprises a spring 631. The inner peripheral surface of the mounting frame cylindrical portion 645 is provided with a third surface 643 extending in the radial direction, and the spring 631 is located between the temperature sensor 605 and the third surface 643. For example, the temperature sensor 605 is provided below with the spring 631, the lower end of the spring 631 is supported on the mounting frame 610, and the upper end of the spring 631 pushes the temperature sensor 605, so that the temperature sensor 605 can elastically contact the cooking container 300, and ensure the temperature measurement effect. The third surface 643 of the mounting frame 610 is connected with a wire passing hole 644, that is, the third surface 643 and the inner peripheral surface of the wire passing hole 644 are both part of a continuous surface of the mounting frame 610, wherein the wire passing hole 644 is used for passing the cable 626 of the temperature sensor 605.

[0148] The interiors of the coil disc cylindrical portion 635 and the mounting frame cylindrical portion 645 are hollow, and are just used for mounting the temperature sensor 605. The temperature sensor 605 does not rotate with the coil disc 603.

[0149] Optionally, as shown in Figure 2 and Figure 7As shown, the electromagnetic heating module 600 further comprises a blocking structure 602. The blocking structure 602 comprises a blocking part 651 and a connecting part 652, for example. The blocking part 651 is configured as a blocking ring in the radial direction of the coil disc 603. The connecting part 652 extends substantially perpendicular to the blocking part 651. One end of the connecting part 652 is connected to the blocking part 651, and the other end is used to connect the mounting frame 610, for example the mounting frame cylindrical part 645. The connecting part 652 extends in the axial direction of the coil disc 603, for example configured as a sleeve (also referred to as a blocking structure cylindrical part), which is located in the coil disc cylindrical part 635 and connected to the mounting frame 610 (for example, clamped or threaded). The blocking structure 602 is fixedly connected to the mounting frame 610, so as not to rotate with the coil disc 603.

[0150] One end of the connecting part 652 is connected to the middle part of the radial width of the blocking ring of the blocking part 651 (not necessarily the midpoint of the width of the blocking ring). The outer diameter of the blocking ring of the blocking part 651 is greater than the inner diameter of the coil disc cylindrical part 635. The inner diameter of the blocking ring of the blocking part 651 is smaller than the maximum outer diameter of the temperature sensor 605. The part of the blocking ring located radially outward of the connecting part 652 is used to cover the port of the coil disc cylindrical part 635, that is, extending outward from the edge of the coil disc cylindrical part 635 in the radial direction of the coil disc 603, so as to block the coil disc 603 from moving in the axial direction of the coil disc 603 away from the mounting frame 610. The part of the blocking ring located radially inward of the connecting part 652 is used to limit the temperature sensor 605, and the through hole in the middle of the blocking ring is used to expose the temperature sensor 605, which can be extended from the through hole under the action of the spring 631.

[0151] The cooking appliance 100 further comprises a control circuit 400. The control circuit 400 is mounted in the form of a P board on the base 500 or the mounting frame 610, for example. As shown, the control circuit 400 comprises a control device 401, which is configured as an MCU chip, for example. The control device 401 is used to control the operation of all electrically controlled components of the cooking appliance 100. The control device 401 is preferably arranged on the mounting frame 610 and electrically connected to the electromagnetic coil 606, the motor 613 and the temperature sensor 605 through cables, respectively. Figure 8 As shown, the control circuit 400 comprises a control device 401, which is configured as an MCU chip, for example. The control device 401 is used to control the operation of all electrically controlled components of the cooking appliance 100. The control device 401 is preferably arranged on the mounting frame 610 and electrically connected to the electromagnetic coil 606, the motor 613 and the temperature sensor 605 through cables, respectively.

[0152] Preferably, the mounting frame 610 is provided with openings for the power cables of the power consuming components of the electromagnetic heating module 600 or the connecting cables thereof to pass through, so that these cables are connected to the control circuit 400 at the side of the mounting frame 610 opposite to the coil disc 603, facilitating the assembly operation. In the present application, each of the power cables of the power consuming components of the electromagnetic heating module 600 and the connecting cables thereof is referred to as a functional module wire. Further, the side of the mounting frame 610 opposite to the coil disc 603 is provided with wire slots for accommodating these functional module wires. The side of the mounting frame 610 opposite to the coil disc can also be provided with wire clips for limiting these functional module wires.

[0153] As shown in FIGS. 1, 2 and 3, the electromagnetic heating module 600 comprises a mounting frame 610, a coil disc 603, a control circuit 400 and a plurality of electromagnetic coils 606. Figure 6 and Figure 7 As shown in FIGS. 1, 2 and 3, the electromagnetic heating module 600 comprises a mounting frame 610, a coil disc 603, a control circuit 400 and a plurality of electromagnetic coils 606.

[0154] The first main cable 614, the enameled wire bundle 637 and the second main cable 615 are connected in series as a wire bundle assembly 660. The first main cable 614 and the second main cable 615 are respectively connected in series at the two ends of the enameled wire bundle 637.

[0155] The control device 401 controls the electromagnetic heating module 600 to be configured such that the alternating magnetic field has N strong magnetic zones and N weak magnetic zones alternately distributed along the circumferential direction of the electromagnetic heating module 600, wherein the magnetic field strength of the strong magnetic zone is greater than that of the weak magnetic zone. Preferably, the N strong magnetic zones are equally spaced along the circumferential direction of the electromagnetic heating module 600, and the N weak magnetic zones are equally spaced along the circumferential direction of the electromagnetic heating module 600. Considering the limited length of the connecting cables of the enameled wires of the coils 606, the angle range of the rotation of the coil disc 603 is, for example, 360 / N degrees (±180 / N degrees), so that the heating sites can not be missed, and the cooking container 300 can be heated uniformly and comprehensively. In the illustrated embodiment, N = 3.

[0156] The relative rotation between the cooking container 300 and the magnetic field can occur while the first coil 606 is energized, i.e., the magnetic field of the electromagnetic heating module rotates while heating the cooking container 300, so that the cooking container 300 is uniformly heated, and the horizontal temperature difference in the same horizontal plane between different parts inside the cooking container 300 is reduced. Alternatively, the relative rotation between the cooking container 300 and the magnetic field can occur alternately with the energization of the first coil 606, i.e., the rotation is not heated, and the heating is not rotated, so that the vertical temperature difference in the same vertical plane is reduced at each circumferential position. Uniform heating is achieved by operating one cycle.

[0157] The cooking process of the rice cooking of the cooking appliance 100, for example, includes a water absorption process, a boiling process, a boiling maintenance process, a rice stewing process, and a temperature maintaining process in sequence. In the water absorption process, the food material is soaked in warm water to fully absorb water, so as to improve the taste. In the boiling process, the food material is heated to a temperature close to boiling by using a large fire, and then boiled in the boiling maintenance process, so that the food material is basically cooked. In the rice stewing process, the residual free water is dried, so that the food material is further cooked. Finally, in the temperature maintaining process, the user can eat hot food.

[0158] In each process, the electromagnetic heating module 600 (specifically, the electromagnetic coil 606) as the heating device works in a power regulating manner. In each power regulating period, the electromagnetic coil 606 is energized for a preset energization time and is de-energized for a preset de-energization time, and the sum of the preset energization time and the preset de-energization time is the length of a power regulating period. Due to different cooking purposes or effects to be achieved, the average power of each process can be different, for example, the preset energization time of different processes is different. Also, due to the requirement of the cooking cavity in each process for suitable temperature, the power of the electromagnetic heating module 600 in each process can not be constant (the preset energization time of the electromagnetic heating module 600 in different power regulating periods in the same process is different), and can not be in a working state all the time (herein, the electromagnetic heating module 600 in the power regulating period is considered to be in a working state).

[0159] It can be understood that the coil 606 is arranged on the coil disc 603, and cannot be arranged on the P board of the control circuit 400. In order to connect the coil 606 to the control circuit 400, as shown in Figure 8 The control circuit 400 includes a first connection point 431 and a second connection point 432. The first connection point 431 is used to electrically connect the first end 661 of the wiring harness assembly 660. The first main cable 614 provides the first end 661 of the wiring harness assembly 660. The first end 661 of the wiring harness assembly 660 is, for example, the second end 614B of the first main cable 614. For example, as shown in Figure 6As shown, the first connection point 431 is configured as a terminal, and the second end 614B of the first main cable 614 is connected to the terminal, so that one end of the enameled wire bundle 637 is connected to the first connection point 431, i.e., to the control circuit 400, through the first main cable 614. The second connection point 432 is used to electrically connect the second end 662 of the wire harness assembly 660. The second main cable 615 provides the second end 662 of the wire harness assembly 660. The second end 662 of the wire harness assembly 660 is, for example, the second end 615B of the second main cable 615. For example, the second connection point 432 is configured as a terminal, and the second end 615B of the second main cable 615 is connected to the terminal, so that the other end of the enameled wire bundle 637 is connected to the second connection point 432, i.e., to the control circuit 400, through the second main cable 615. Of course, the two ends of the enameled wire bundle 637 can also be directly connected to the first connection point 431 and the second connection point 432, respectively, and the first main cable 614 and the second main cable 615 are omitted.

[0160] The control circuit 400 further includes a resonant capacitor 402, a switching element 403, and a first power supply 441. The resonant capacitor 402 has two ends electrically connected to the first connection point 431 and the second connection point 432, respectively, so that the resonant capacitor 402 and the coil 606 are connected in parallel to form an LC resonant circuit for generating an alternating magnetic field through electromagnetic oscillation. The first power supply 441 is used to be electrically connected to the first connection point 431, so that the LC resonant circuit can be charged to generate an alternating magnetic field. The first power supply 441 is, for example, a high-voltage direct-current power supply obtained by rectifying commercial power. The switching element 403 is connected to the second connection point 432 and the control device 401. The control device 401 can control the on-off of the switching element 403. When the switching element 403 is turned on, the first power supply 441 is turned on with the first connection point 431, so that the first power supply 441 charges the resonant capacitor 402. When the switching element 403 is turned off, the LC resonant circuit cannot be connected to the external circuit, so that the resonant capacitor 402 discharges to the coil 606, and the coil 606 in turn discharges to the resonant capacitor 402, which circulates to form electromagnetic oscillation. The control device 401 realizes the electromagnetic heating function of the electromagnetic heating module 600 by periodically controlling the on-off of the switching element 403.

[0161] The switch element 403, for example, comprises a power switch tube IGBT, the collector of which is connected to the second connection point 432, i.e. to the second end 662 of the wiring harness assembly, the emitter of which is grounded, and the gate of which is connected to the control device 401. The control device 401 controls the on-off of the power switch tube IGBT by changing the output signal to the gate of the power switch tube IGBT. When the power switch tube IGBT is turned on, the first power supply 441 charges the LC resonant circuit. When the power switch tube IGBT is turned off, the LC resonant circuit oscillates to generate an alternating magnetic field.

[0162] The control circuit 400 further comprises a first branch 410 for detecting whether the wiring harness assembly 660 is broken, i.e. whether the wiring harness assembly 660 is damaged. The first branch 410 is configured to be connected to the first connection point 431. The control device 401 is electrically connected to the first branch 410. The electromagnetic heating cooking appliance 100 is configured to selectively connect the first end 661 of the wiring harness assembly 660 to the first power supply 441 or the first branch 410 under the control of the control device 401. When connected to the first power supply 441, the coil 606 can perform the electromagnetic heating function. When connected to the first branch 410, it is detected whether the wiring harness assembly 660 is broken (e.g. whether the enameled wire of the enameled wire harness 637 is broken, whether the first main cable 614 is broken, and whether the second main cable 615 is broken). The control device 401 is configured to determine whether the wiring harness assembly 660 is broken according to the output signal of the first branch 410 when the wiring harness assembly 660 is connected to the first branch 410. Further, the control device 401 can also control the heating power of the coil 606 when the wiring harness assembly 660 is connected to the first power supply 441 according to the result of the breakage determination.

[0163] Specifically, the control circuit 400 further comprises a selection switch 420 for selectively connecting the first connection point 431 to the first power supply 441 or the first branch 410. The selection switch 420 is controlled by the control device 401. The selection switch 420, for example, is configured as a two-way exclusive switch. The first way of the exclusive switch is configured to connect the first end 661 of the wiring harness assembly and the first power supply 441, and the second way of the exclusive switch is configured to connect the first end 661 of the wiring harness assembly and the first branch 410. The exclusive switch is electrically connected to the control device 401 to selectively turn on the first way or the second way under the control of the control device 401.

[0164] As Figure 8As shown, the exclusive switch has three terminals a, b and c, which form a single-pole double-throw switch, wherein c is the fixed terminal and a and b are the movable terminals. The first path of the exclusive switch is the circuit between terminals b and c. The second path of the exclusive switch is the circuit between terminals a and c. The first connection point 431 is connected to the fixed terminal c, the first power supply 441 is connected to the movable terminal b, and the first branch 410 is connected to the movable terminal a. The terminal c is selectively connected to the terminal b or a under the control of the control device 401, so that the first end 661 of the wiring harness assembly is selectively connected to the first power supply 441 or the first branch 410. The internal circuit structure of the exclusive switch can have various forms, or in other words, the selection switch 420 can be configured as a controllable single-pole double-throw switch in various forms.

[0165] The first branch 410, for example, includes a first resistor 411. The first end 412 of the first resistor 411 is connected to a direct current power supply 442 (for example, 3-36V), and the second end 413 of the first resistor 411 is used to connect the first end 661 of the wiring harness assembly. Specifically, the second end 413 of the first resistor 411 is used to connect the first connection point 431. The second end 413 of the first resistor 411 is connected to the terminal a of the second path of the exclusive switch. Thus, under the control of the control device 401, the first end 661 of the wiring harness assembly is selectively connected to the first power supply 441 or the second end 413 of the first resistor 411. That is, the selection switch 420 is used to selectively connect the first connection point 431 to the first power supply 441 or the second end 413 of the first resistor 411.

[0166] When the second path of the exclusive switch is turned on, the wiring harness assembly 660 is connected in series between the direct current power supply 442 and the ground. The wiring harness assembly 660 can be regarded as a resistor, and the settings of the first resistor 411 and the direct current power supply 442 are known, so that the resistance of the wiring harness assembly 660 can be calculated according to the voltage division of the two resistors. When the wiring harness assembly 660 is broken, the cross-sectional area of the conductive part of the wiring harness assembly 660 at the broken part becomes smaller, and the resistance becomes larger. The control device 401 is configured to, when the control device 401 connects the first end 661 of the wiring harness assembly to the second end 413 of the first resistor 411, the control device 401 also controls the power switch tube IGBT to be turned on, so that the direct current circuit between the direct current power supply 442 and the ground is turned on. The control device 401 is connected to the second end 413 of the first resistor 411, and judges whether the wiring harness assembly 660 is broken according to the output voltage Vt of the second end 413 of the first resistor 411.

[0167] The electric group of the wire harness assembly 660 is usually small, in order to improve the detection accuracy, the first resistor 411 is configured as a high-precision resistor, for example, a constantan alloy resistor. Preferably, the resistance value of the first resistor 411 is comparable to the resistance value of the wire harness assembly 660 in the unbroken state, that is, of the same order of magnitude. The resistance value of the first resistor 411 is, for example, 0.2-4Ω. For example, when the resistance of the wire harness assembly 660 when unbroken is not less than 1Ω, the resistance value of the first resistor 411 is also not less than 1Ω; when the resistance of the wire harness assembly 660 when unbroken is less than 1Ω, the resistance value of the first resistor 411 is also less than 1Ω. For example, when the resistance of the wire harness assembly 660 when unbroken is 0.2Ω-1Ω, the resistance value of the first resistor 411 is in the range of 0.2Ω-1Ω; and if the resistance of the wire harness assembly 660 when unbroken is 1Ω-4Ω, the resistance value of the first resistor 411 is in the range of 1Ω-4Ω. In this way, the accuracy of the detection result can be ensured.

[0168] As shown in FIG. 10, preferably, the cooking appliance 100 first performs the detection process S10 to detect whether the wire harness assembly 660 is broken each time the cooking function is performed. After the detection process S10, the cooking process S20 is performed, which includes, for example, the aforementioned water absorption process, the boiling process, the maintaining boiling process, the simmering process, and the keeping warm process. The cooking appliance 100 can adjust the heating power in the cooking process S20 according to the detection result in the detection process S10. Figure 9 In the detection process S10, in step S11, the control device 401 first turns on the second path of the mutual exclusion switch and the power switch tube IGBT, thereby turning on the direct current resistance voltage dividing circuit. Then, the control device 401 can obtain the comparison voltage Vc according to the output voltage Vt of the second end 413 of the first resistor 411. In step S18, when the comparison voltage Vc is less than or equal to the first preset voltage V1, it is determined that the wire harness assembly 660 is unbroken; when the comparison voltage Vc is greater than the first preset voltage V1, it is determined that the wire harness assembly 660 is broken. The first preset voltage V1 is, for example, the voltage divided by the wire harness assembly 660 and the first resistor 411 to the direct current power supply 442 when the wire harness assembly 660 is unbroken.

[0169]

[0170] ​To ensure the effectiveness of the detection, the control device measures the output voltage of the second terminal 413 of the first resistor 411 N times, and the comparison voltage Vc is the average value Vmean of the N output voltages Vt of the second terminal 413 of the first resistor 411. For example, the range of the number of measurements N is 5 ≤ ​​N ≤ 100. Furthermore, when the N output voltages Vt meet a preset condition, the average value Vmean of the N output voltages Vt is used as the comparison voltage Vc; when the N output voltages Vt do not meet the preset condition, N new output voltages Vt are acquired. For example, the preset condition could be: the N output voltages Vt are the output voltages Vt of the second terminal 413 of the first resistor 411 continuously acquired by the control device 401, and the difference between the maximum value Vmax and the minimum value Vmin of the N output voltages Vt is less than or equal to a preset difference Vd. That is, under the condition that the DC voltage divider circuit can operate stably without interference for a period of time, the voltage divider value Vt of the wire harness assembly 660 is accepted.

[0171] like Figure 9 As shown, after the DC voltage divider circuit is turned on, in step S12, the number of times n is set to 0. Then, in steps S13-S15, the control device 401 acquires and records the output voltage Vt of the second terminal 413 of the first resistor 411 at a certain sampling rate, incrementing the value of n by 1 for each recorded number of times, until N Vt values ​​are acquired consecutively. Then, in step S16, it is checked whether the difference between the maximum value Vmax and the minimum value Vmin of these N output voltages Vt is less than or equal to a preset difference Vd. If so, the acquired signal value is accepted, and the comparison voltage Vc is calculated; otherwise, N more Vt values ​​are acquired.

[0172] Understandably, for each cooking function (e.g., cooking rice, cooking porridge), the cooking appliance 100 has a preset cooking process. In each step (stage) of the cooking process, the electromagnetic heating module 600 has a preset power, which is designed for the case where the wiring harness assembly 660 is undamaged. In cooking step S20, the control device 401 is configured such that, when it is determined that the wiring harness assembly 660 is not broken, the power of the coil 606 when the wiring harness assembly 660 is connected to the first power source 441 is the aforementioned preset power; when it is determined that the wiring harness assembly 660 is broken, the power of the coil 606 when the wiring harness assembly 660 is connected to the first power source 441 is less than the aforementioned preset power, or the coil 606 does not output power. That is, if the wiring harness assembly 660 is undamaged, then it is controlled according to the preset program; if the wiring harness assembly 660 is damaged, in order to protect the wiring harness assembly 660 (e.g., the enameled wire harness 637) and avoid accidents, the power is reduced or the heating function is not executed.

[0173] For example, when the comparison voltage Vc is greater than the first preset voltage V1 but less than or equal to the second preset voltage V2, it indicates that the resistance of the wiring harness assembly 660 does not increase much, for example, only a small number of the enameled wires are broken, the enameled wire harness 637 is slightly damaged, and the power of the coil 606 connected to the first power supply 441 by the wiring harness assembly 660 is less than the preset power; when the comparison voltage Vc is greater than the second preset voltage V2, it indicates that the resistance of the wiring harness assembly 660 increases greatly, for example, the enameled wire harness 637 is severely damaged, and a large number of enameled wires are broken, which can cause the coil 606 to not output power. When the wiring harness assembly 660 is severely damaged, the electromagnetic heating module 606 is not suitable for working, and at this time the cooking appliance 100 can be controlled to alarm.

[0174] When the power is down-regulated, the down-regulation of the power can be realized by down-regulating the total current of the wiring harness assembly 660. In other words, the preset current of the coil 606 at the preset power is I0, and when the wiring harness assembly 660 is slightly damaged, the current I1 of the coil 606 is less than I0. For example, the current I1 of the coil 606 when the wiring harness assembly 660 is slightly damaged can be determined according to the preset current I0 and the value of the comparison voltage Vc.

[0175] In the present application, the degree of breakage of the wiring harness assembly 660 is equivalent to the number of broken enameled wires of the enameled wire harness 637. In other words, whether a number of enameled wires of the enameled wire harness 637 are broken or the first main cable 614 and / or the second main cable 615 are partially damaged, the cross-sectional area of the wiring harness assembly 660 will become smaller, and the present application uniformly equates the degree of the cross-sectional area of the wiring harness assembly 660 becoming smaller to the number of broken enameled wires of the enameled wire harness 637. For example, the first main cable 614 is damaged, and the effective connection cross-sectional area of the damaged part is 40% of that when it is not damaged, which is equivalent to 60% of the enameled wires of the enameled wire harness 637 being broken. For another example, the second main cable 615 is damaged, and the effective connection cross-sectional area of the damaged part is 70% of that when it is not damaged, which is equivalent to 30% of the enameled wires of the enameled wire harness 637 being broken.

[0176] Specifically, the enameled wire harness 637 includes m enameled wires in total. When the wiring harness assembly 660 is slightly damaged, it can be equivalent to keeping the current flowing through each enameled wire the same as that at the preset power, and the sum of the currents of all equivalent undamaged enameled wires is I1. When it is determined that the wiring harness assembly 660 is broken, the actual resistance of the wiring harness assembly 660 can be calculated according to the comparison voltage Vc. The normal resistance value of the wiring harness assembly 660 when it is not damaged is known, and according to the rule that the resistance is inversely proportional to the cross-sectional area, the proportion of the cross-sectional area becoming smaller can be calculated. The number of equivalent undamaged enameled wires y is proportional to the cross-sectional area. Therefore, the number of equivalent broken enameled wires x can be calculated according to the comparison voltage Vc. The current I1 is I0(m-x) / m.

[0177] It should be noted that the preset power of the electromagnetic heating module 600 in each process (stage) of the cooking process can not be the same, for example, the preset power of the water absorption process is different from the preset power of the boiling process. Each process can have its own preset power and preset current I0. When the wiring assembly 660 is damaged, the actual power of each process is reduced based on the preset power and preset current I0 of each process. The control device 401 can control the heating power and operating current of the coil 606 by controlling the duty cycle of the power regulation period.

[0178] It can be understood that when the power is reduced, the cooking time will be extended. The cooking appliance 100 can understand the cooking progress and control the heating power according to the heating temperature.

[0179] It can be understood that in the process S20, when the electromagnetic heating module 600 can work, the control device 401 controls the first path of the mutual exclusion switch to be turned on, and the working mode of the alternating current power supply is restored.

[0180] It can be understood that when all coils 606 are made of the same enameled wire assembly 637, the control circuit 400 only needs to set one first branch 410, one resonance capacitor 402 and one switch element 403. When the coils 606 are made of respective enameled wire assemblies, a corresponding resonance capacitor 402 and a switch element 403 need to be configured for each coil 606, so as to independently control the heating work of each coil 606. At this time, the control circuit 400 can configure a corresponding first branch 410 for each coil 606; or, a first branch 410 can also be set, and the same first branch 410 can be connected with each coil 606 respectively through a more complex selection switch.

[0181] The processes and steps described in all the preferred embodiments described above are only examples. Unless adverse effects occur, various processing operations can be performed in different orders from the above processes. The order of the steps of the above processes can also be added, combined or deleted according to actual needs.

[0182] In understanding the scope of the present application, the term "comprising" and its derivatives, as used herein, are intended to be open-ended terms that specify the presence of the stated features, elements, components, groups, integers, and / or steps, but do not exclude the presence of other unstated features, elements, components, groups, integers and / or steps. The foregoing also applies to like- meaning terms such as "comprising", "having", "including", and their derivatives, and their derivatives.

[0183] The term "attached" or "attaching" as used herein includes configurations wherein an element is directly secured to another element by affixing the element directly to the other element; configurations wherein the element is indirectly secured to the other element by affixing the element to an intermediate member that in turn is affixed to the other element; and configurations wherein one element is integral with the other element, i.e., one element is essentially a part of the other element. The definition also applies to words of similar meaning, such as "connected", "coupled", "joined", "adhered", "fixed", and their derivatives. Finally, relative terms as used herein such as "basically", "approximately" and "substantially" mean an amount of deviation that is minor enough to not change the final result significantly.

[0184] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The features described herein in one embodiment can be applied to another embodiment, mutatis mutandis, unless the features are not applicable or are otherwise stated.

[0185] The present application has been described through the above embodiments, but it should be understood that the above embodiments are only for the purpose of example and illustration, and are not intended to limit the present application to the scope of the described embodiments. Furthermore, those skilled in the art can understand that the present application is not limited to the above embodiments, and various modifications and changes can be made according to the teachings of the present application, and these modifications and changes all fall within the scope of the present application claimed.

Claims

1. A control circuit for an electromagnetic heating cooking appliance, the electromagnetic heating cooking appliance comprising a wiring harness assembly, the wiring harness assembly comprising an enameled wire harness, the enameled wire harness comprising multiple strands of enameled wire, the enameled wire harness being wound into at least one coil, the coil being used to generate an alternating magnetic field under the power supply of a first power source to implement electromagnetic heating, characterized in that, The control circuit includes: The first connection point is used to connect the first end of the wire harness assembly to the first power source; The second connection point is used to connect the second end of the wire harness assembly and the switching element; The first branch is used to detect whether the wiring harness assembly is broken, and the first branch is used to connect to the first connection point; and A selector switch is used to selectively connect the first connection point to either the first power source or the first branch.

2. The control circuit according to claim 1, characterized in that, The switching element includes a power switch transistor, the collector of which is connected to the second connection point, and the emitter of which is grounded.

3. The control circuit according to claim 1, characterized in that, The first branch includes a first resistor, a first end of which is connected to a DC power supply, and a second end of which is used to connect to the first connection point. The selector switch is used to selectively connect the first connection point to the second terminal of the first power supply or the first resistor.

4. The control circuit according to claim 3, characterized in that, The first resistor is configured as a constantan resistor.

5. The control circuit according to claim 3, characterized in that, The resistance of the first resistor is 0.2-4Ω.

6. The control circuit according to claim 3, characterized in that, The resistance value of the first resistor is equivalent to the resistance value of the wire harness assembly in its unbroken state.

7. The control circuit according to any one of claims 1 to 6, characterized in that, The selector switch is configured as a mutual exclusion switch. The first path of the mutual exclusion switch is used to connect the first connection point and the first power supply, and the second path of the mutual exclusion switch is used to connect the first connection point and the first branch.

8. An electromagnetic heating cooking appliance, characterized in that, include: A wire harness assembly, the wire harness assembly including an enameled wire harness, the enameled wire harness including multiple strands of enameled wire, the enameled wire harness being wound into at least one coil, the coil being used to generate an alternating magnetic field under the power supply of a first power source; The control circuit according to any one of claims 1 to 7, wherein the first connection point is connected to a first end of the wiring harness assembly and the first power supply, and the second connection point is connected to a second end of the wiring harness assembly and a switching element; and A cooking container, made of ferromagnetic material, is placed within the magnetically inductive region of the coil.

9. The electromagnetic heating cooking appliance according to claim 8, characterized in that, The electromagnetic heating cooking appliance further includes an electromagnetic heating module, which includes the coil. The electromagnetic heating module is configured such that the alternating magnetic field is non-uniformly distributed along the circumferential direction of the electromagnetic heating module. The cooking container is positioned substantially coaxially with the electromagnetic heating module within the magnetically inductive region of the coil. The electromagnetic heating cooking appliance is configured such that the coil is rotatable relative to the cooking container about a coaxial axis, so that the alternating magnetic field is rotatable relative to the cooking container about the coaxial axis.

10. The electromagnetic heating cooking appliance according to claim 9, characterized in that, The electromagnetic heating module further includes a coil disk, with the coil disposed on the coil disk. The winding center of the coil is offset from the central axis of the coil disk, and the central axis of the coil disk is the central axis of the electromagnetic heating module. The electromagnetic heating cooking appliance is configured such that the coil is rotatable relative to the cooking container about the coaxial axis.

11. The electromagnetic heating cooking appliance according to claim 10, characterized in that, The electromagnetic heating module includes a plurality of coils, all of which are arranged at intervals along the circumferential direction of the coil disk.

12. The electromagnetic heating cooking appliance according to claim 11, characterized in that, All of the coils are formed by winding the same enameled wire bundle separately.

13. The electromagnetic heating cooking appliance according to claim 10, characterized in that, The coil is disposed on the side of the coil disk facing away from the cooking container; and / or The axial cross-section of the coil disk includes a C-shaped structure.

14. The electromagnetic heating cooking appliance according to any one of claims 8 to 13, characterized in that, The wire harness assembly further includes a first main cable and a second main cable, which are connected in series at both ends of the enameled wire harness. The first main cable provides a first end of the wire harness assembly, and the second main cable provides a second end of the wire harness assembly.

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