Cooking utensil control method and cooking utensil

Abstract

The invention discloses a control method of a cooking utensil and the cooking utensil. The cooking utensil comprises an electromagnetic heating device, a detection device and a control device, the electromagnetic heating device is used for conducting electromagnetic heating on a pot, and the detection device is used for detecting relevant parameters of the distance between the pot and the electromagnetic heating device. The control device is electrically connected with the electromagnetic heating device and the detection device; the control method of the cooking utensil comprises the following steps: receiving related parameters of the distance between the cooker and the electromagnetic heating device detected by a detection device; when the distance related parameters meet a first preset condition, it is judged that the pot is in a pot throwing state; when the pot is in the pot throwing state, the electromagnetic heating device is controlled to work at the pot throwing power matched with the pot throwing state. The problem that the cooking effect is affected due to the fact that the pot is almost in a heating stopping state in the pot throwing process due to repeated pot throwing in a short time is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of cooking appliances, and particularly to a control method for cooking appliances and a cooking appliance. Background Art

[0002] In daily cooking scenarios, heating devices such as induction cookers and gas stoves can be used. Among them, an induction cooker generates a high-frequency alternating magnetic field through a coil disk, causing an eddy current to be generated in the cookware under the action of the magnetic field and generating corresponding heat. Flipping the pan is one of the skills in Chinese cooking, which can achieve the purpose of quickly stir-frying ingredients. However, when using an induction cooker, when the cookware gradually moves away from the coil disk, the coupling between the coil disk and the cookware becomes poor. To ensure the safety of the induction cooker during the above process, usually the heating power of the induction cooker will rapidly decrease or even stop heating. When the cookware is placed back on the panel, it is necessary to successfully detect the cookware again and gradually restore the normal heating power. It generally takes at least several seconds for the induction cooker to resume from stopping heating to normal heating power. If the pan is flipped repeatedly within a short period of time, the induction cooker is almost in a state of stopping heating during the pan-flipping process, affecting the cooking effect. Summary of the Invention

[0003] The main object of the present invention is to propose a control method for a cooking appliance and a cooking appliance, aiming to solve the problem that when the pan is flipped repeatedly within a short period of time, the induction cooker is almost in a state of stopping heating during the pan-flipping process, affecting the cooking effect.

[0004] To achieve the above object, on the one hand, the present invention proposes a control method for a cooking appliance. The cooking appliance includes an electromagnetic heating device, a detection device, and a control device. The electromagnetic heating device is used to perform electromagnetic heating on the cookware. The detection device is used to detect distance-related parameters between the cookware and the electromagnetic heating device. The control device is electrically connected to the electromagnetic heating device and the detection device;

[0005] The control method of the cooking appliance includes:

[0006] Receiving the distance-related parameters detected by the detection device between the cookware and the electromagnetic heating device;

[0007] When the distance-related parameters meet a first preset condition, it is determined that the cookware is in a pan-flipping state;

[0008] When the cookware is in a pan-flipping state, controlling the electromagnetic heating device to operate at a pan-flipping power matching the pan-flipping state.

[0009] Optionally, the distance-related parameters include resonance peak voltage-related parameters;

[0010] The step of determining that the cookware is in a pan-flipping state when the distance-related parameters meet a first preset condition includes:

[0011] When the relevant parameters of the resonant peak voltage obtained in two adjacent times show an upward trend, it is determined that the cookware is in the state of throwing the pot.

[0012] Optionally, the step of controlling the electromagnetic heating device to work at the throwing power matching the throwing state when the cookware is in the throwing state includes:

[0013] When the cookware is in the throwing state, control the power of the electromagnetic heating device to decrease.

[0014] Optionally, the electromagnetic heating device includes a switching device.

[0015] The step of controlling the power of the electromagnetic heating device to decrease when the cookware is in the throwing state includes:

[0016] When the cookware is in the throwing state in the current resonance period, reduce the width of the driving pulse of the switching device in the next resonance period.

[0017] Optionally, after the step of controlling the electromagnetic heating device to work at the throwing power matching the throwing state when the cookware is in the throwing state, it further includes:

[0018] When the distance-related parameter meets the second preset condition, it is determined that the cookware is in the state of returning the pot;

[0019] When the cookware is in the state of returning the pot, control the electromagnetic heating device to work at the first returning power matching the returning state.

[0020] Optionally, the distance-related parameter includes the relevant parameter of the resonant peak voltage;

[0021] The step of determining that the cookware is in the throwing state when the distance-related parameter meets the second preset condition includes:

[0022] When the relevant parameters of the resonant peak voltage obtained in two adjacent times show a downward trend, it is determined that the cookware is in the state of returning the pot.

[0023] Optionally, the step of controlling the electromagnetic heating device to work at the first returning power matching the returning state when the cookware is in the returning state includes:

[0024] When the cookware is in the returning state, control the power of the electromagnetic heating device to increase.

[0025] Optionally, the electromagnetic heating device includes a switching device.

[0026] The step of controlling the electromagnetic heating device to work at the first returning power matching the returning state when the cookware is in the returning state includes:

[0027] When the cookware is in the returning state in the current resonance period, increase the width of the driving pulse of the switching device in the next resonance period.

[0028] Optionally, after the step of controlling the electromagnetic heating device to operate at a tossing power matching the tossing state when the cookware is in the tossing state, the method further includes:

[0029] When the distance-related parameter satisfies the third preset condition, it is determined that the cookware is in the off-the-cookware state;

[0030] When the cookware is in the off-the-cookware state, control the electromagnetic heating device to operate at an off-the-cookware power matching the off-the-cookware state.

[0031] Optionally, the electromagnetic heating device includes a switching device, and the distance-related parameter includes a resonant peak voltage-related parameter;

[0032] The step of determining that the cookware is in the off-the-cookware state when the distance-related parameter satisfies the third preset condition includes:

[0033] When the width of the driving pulse of the switching device is less than a preset width threshold and the change value between the resonant peak voltage-related parameters obtained twice adjacent to each other is less than the first threshold, it is determined that the cookware is in the off-the-cookware state.

[0034] Optionally, the step of controlling the electromagnetic heating device to operate at an off-the-cookware power matching the off-the-cookware state when the cookware is in the off-the-cookware state includes:

[0035] When the cookware is in the off-the-cookware state, control the power of the electromagnetic heating device to be zero.

[0036] Optionally, the electromagnetic heating device includes a switching device, and the step of controlling the electromagnetic heating device to operate at an off-the-cookware power matching the off-the-cookware state when the cookware is in the off-the-cookware state includes:

[0037] When the cookware is in the off-the-cookware state in the current resonance period, control the width of the driving pulse of the switching device in the subsequent N resonance periods to be zero, where N≥1.

[0038] Optionally, after the step of controlling the electromagnetic heating device to operate at an off-the-cookware power matching the off-the-cookware state when the cookware is in the off-the-cookware state, the method further includes:

[0039] When the distance-related parameter satisfies the fourth preset condition, it is determined that the cookware is in the back-on-the-cookware state;

[0040] When the cookware is in the back-on-the-cookware state, control the electromagnetic heating device to operate at a second back-on-the-cookware power matching the back-on-the-cookware state.

[0041] Optionally, the distance-related parameter includes a resonant peak voltage-related parameter;

[0042] The step of determining that the cookware is in the back-on-the-cookware state when the distance-related parameter satisfies the fourth preset condition includes:

[0043] When the relevant parameters of the resonant peak voltage obtained in two adjacent times show a decreasing trend, and the decrease value of the relevant parameters of the resonant peak voltage obtained in two adjacent times is greater than the second threshold, it is determined that the cookware is in the state of returning to the pot.

[0044] Optionally, the step of controlling the electromagnetic heating device to work at a second return power matched to the return state when the cookware is in the return state includes:

[0045] When the cookware is in the return state, control the power of the electromagnetic heating device to be greater than zero.

[0046] Optionally, the electromagnetic heating device includes a switching device.

[0047] Optionally, the step of controlling the electromagnetic heating device to work at a second return power matched to the return state when the cookware is in the return state includes:

[0048] When the cookware is in the return state in the current resonant cycle, increase the width of the driving pulse of the switching device in the next resonant cycle.

[0049] Optionally, the relevant parameters of the resonant peak voltage include the resonant peak voltage and / or the resonant peak current.

[0050] On the other hand, the present invention provides a cooking appliance, which includes:

[0051] An electromagnetic heating device for electromagnetic heating of the cookware;

[0052] A detection device for detecting the distance-related parameters between the cookware and the electromagnetic heating device, and

[0053] A control device, electrically connected to the electromagnetic heating device and the detection device, the control device includes a memory, a processor and a control program of the cooking appliance stored on the memory and operable on the processor, and the control program of the cooking appliance is configured to implement the steps of the control method of the cooking appliance as described above.

[0054] Optionally, the electromagnetic heating device includes a switching device.

[0055] Optionally, the cooking appliance includes an induction cooker.

[0056] Optionally, the electromagnetic heating device includes a coil assembly, which includes a bracket and a coil unit. The bracket has a first side and a second side that are opposite in a first direction. The coil unit includes a multi-turn coil, and each turn of the coil includes a first wire segment and a second wire segment with opposite currents and connected to each other. The multi-turn coil is wound around the first side and the second side of the bracket, so that a plurality of the first wire segments are distributed on the first side of the bracket and a plurality of second wire segments are distributed on the second side of the bracket.

[0057] In the technical solution of the present invention, it is judged whether the cookware is in the state of throwing the pot through the distance-related parameters. When in the state of throwing the pot, the electromagnetic heating device is controlled to work at the throwing pot power. Thus, during the process of throwing the pot, a proper power output is still maintained continuously, rather than directly turning off the electromagnetic heating device. Therefore, when the cookware returns close to the stove surface again, it is beneficial to quickly increase the heating power to the normal level. Furthermore, the cookware can still have a certain heating power during the process of throwing the pot, and the time for the power to recover to the normal level is greatly shortened, improving the user experience. It avoids the problem that when throwing the pot repeatedly in a short time, the heating is almost stopped during the process of throwing the pot, affecting the cooking effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0059] Figure 1 Schematic diagram of an embodiment of a cooking appliance provided by the present invention;

[0060] Figure 2 Stereoscopic schematic diagram of an embodiment of a cooking appliance provided by the present invention;

[0061] Figure 3 Stereoscopic schematic diagram of the coil unit of the electromagnetic heating device in the cooking appliance provided by the present invention;

[0062] Figure 4 Schematic diagram of the eddy current when the electromagnetic heating device in the cooking appliance provided by the present invention is working;

[0063] Figure 5 Schematic diagram of the control device structure of the hardware operating environment involved in the embodiment solution of the present invention;

[0064] Figure 6 Schematic flowchart of an embodiment of the control method of the cooking appliance provided by the present invention;

[0065] Figure 7 Another embodiment of the control method for a cooking appliance provided by the present invention; Resonant voltage - time and switching pulse - time diagrams

[0066] Figure 8 Schematic flowchart of another embodiment of the control method for a cooking appliance provided by the present invention

[0067] Figure 9 Another embodiment of the control method for a cooking appliance provided by the present invention; Resonant voltage - time and switching pulse - time diagrams

[0068] Figure 10 Schematic flowchart of another embodiment of the control method for a cooking appliance provided by the present invention

[0069] Figure 11 Another embodiment of the control method for a cooking appliance provided by the present invention; Resonant voltage - time and switching pulse - time diagrams

[0070] Figure 12 Schematic flowchart of another embodiment of the control method for a cooking appliance provided by the present invention

[0071] Explanation of the reference numerals in the drawings

[0072]

[0073]

[0074] The realization, functional features and advantages of the object of the present invention will be further described with reference to the embodiments and the accompanying drawings Detailed implementation manners

[0075] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention

[0076] It should be noted that if there are directional indications involved in the embodiments of the present invention, the directional indications are only used to explain the relative position relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly

[0077] In addition, if the embodiments of the present invention involve descriptions such as "first" and "second", the descriptions of "first", "second", etc. are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between various embodiments may be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0078] In daily cooking scenarios, heating devices such as induction cookers and gas stoves can be used. Among them, an induction cooker generates a high-frequency alternating magnetic field through a coil disk, causing the cookware to generate eddy currents under the action of the magnetic field and generating corresponding heat.

[0079] Tossing the pan is one of the cooking techniques in Chinese cuisine, which can achieve the purpose of quickly stir-frying ingredients. However, when using an induction cooker, the magnetic field intensity generated by the coil disk in the induction cooker is distributed in a gradient manner and decreases rapidly as the height from the surface of the coil disk increases. When the cookware gradually moves away from the coil disk, the magnetic field induced by the cookware will be less, and the coupling between the coil disk and the cookware will be worse. To ensure the safety of the induction cooker during the above process, usually the heating power of the induction cooker will decrease rapidly. When the coupling between the coil disk and the cookware decreases to a certain extent, the induction cooker even stops heating. When the cookware is placed back on the panel again, it can be detected successfully again and gradually resume the normal heating power.

[0080] Each time the induction cooker stops heating and then resumes to the normal heating power, it generally takes at least several seconds. If the pan is tossed repeatedly in a short period of time, the induction cooker is almost in a state of stopping heating during the tossing process, and the time to resume heating again will be longer. And this heating interruption will significantly affect the quality of the dishes, such as excessive moisture, and the cooking time is extended, resulting in the green vegetables turning yellow, etc.

[0081] In view of this, the present invention provides a control method for a cooking appliance and a cooking appliance. Figure 1 and Figure 4 are embodiments of the cooking appliance provided by the present invention. Figures 5 to 12 is an embodiment of the control method for the cooking appliance provided by the present invention.

[0082] Referring to Figure 1 , the cooking appliance 100 proposed by the present invention includes an electromagnetic heating device 1, a detection device, and a control device. The electromagnetic heating device 1 is used to perform electromagnetic heating on the cookware 200. The detection device is used to detect the distance-related parameters between the cookware 200 and the electromagnetic heating device 1. The control device is electrically connected to the electromagnetic heating device 1 and the detection device.

[0083] It can be understood that the electromagnetic heating device 1 may further include at least one coil assembly, and the coil assembly includes at least one coil disk. A high-frequency alternating magnetic field is generated by the coil disk, so that eddy currents are generated in the cookware 200 under the action of the magnetic field, and corresponding heat is generated. The electromagnetic heating device 1 can heat only the bottom of the cookware 200, or can heat both the side wall and the bottom of the cookware 200 at the same time.

[0084] Exemplarily, in an embodiment of the present invention, refer to Figures 2 - 3 , the electromagnetic heating device 1 includes a coil assembly 11. The coil assembly 11 includes a bracket 111 and a coil unit 112. The bracket 111 has a first side 111a and a second side 111b that are opposite in a first direction. The coil unit 112 includes multiple turns of coils, and each turn of the coil includes a first wire segment 112a and a second wire segment 112b with opposite currents and connected to each other. The multiple turns of coils are wound around the first side 111a and the second side 111b of the bracket 111, so that a plurality of the first wire segments 112a are distributed on the first side 111a of the bracket 111, and a plurality of second wire segments 112b are distributed on the second side 111b of the bracket 111.

[0085] During operation, the first side 111a is arranged corresponding to the cookware 200. When each of the first wire segments 112a is passed through an alternating current, according to Ampere's rule, the magnetic induction lines generated by each of the first wire segments 112a extend from one end of its working area along its working side away from the first wire segment 112a, and then extend to the other end of the working area to form a closed magnetic field. In this way, the magnetic field formed by the first wire segment 112a extends to the periphery of the outer end area of the first wire segment 112a on the one hand to have a wider magnetic field area, and extends outside the working side of the first wire segment 112a to have a higher magnetic field distribution area. Therefore, when heating the cookware 200, it can heat a wider area of the bottom of the cookware 200 and can extend to the side wall of the cookware 200 to heat the side part of the cookware 200. Figure 2 The arrows in Figure 4 are schematic diagrams of the magnetic induction lines when the electromagnetic heating device is working,

[0086] The electromagnetic heating device 1 may further include a panel 12, a temperature measuring component, a blower, a base, and a control board for receiving user operations, etc.

[0087] It can be understood that the detection device is used to detect the distance-related parameters between the cookware 200 and the electromagnetic heating device 1. The distance-related parameters can include parameters such as distance, resonant peak voltage parameter, resonant peak current parameter, etc. The distance can be detected by a displacement detection device. Therefore, a displacement detection device can be provided in the electromagnetic heating device 1 or the cookware 200. The resonant peak voltage parameter, resonant peak current parameter, etc. can be detected by a voltage or current detection device. Therefore, a voltage or current detection device can be provided in the electromagnetic heating device 1. The voltage or current detection device can be set at any position within the electromagnetic heating device 1 according to different product space limitations.

[0088] The control device includes a memory, a processor, and a control program of the pressure cooking appliance 100 stored on the memory and executable on the processor. The control program of the cooking appliance 100 is configured to implement the steps of the control method of the cooking appliance 100.

[0089] Further, the control device can at least include a capacitive element, a switching element, and a processing unit that are equivalently connected in parallel with the coil in the electromagnetic heating device 1. The switching element is used to control the connection and disconnection between the coil and the power supply. The processing unit is used to receive the output signals of the detection unit or other modules, and output a switching signal for controlling the on / off of the switching unit, as well as signals for controlling other modules.

[0090] Further, the control device can at least include a capacitive element, a switching device, and a processing unit that are equivalently connected in parallel with the coil in the electromagnetic heating device 1. The switching device is used to control the connection and disconnection between the coil and the power supply. The processing unit is used to receive the output signals of the detection unit or other modules, and output a switching signal for controlling the on / off of the switching device, as well as signals for controlling other modules.

[0091] Refer to Figure 5 , Figure 5 It is a schematic structural diagram of the control device for the hardware operating environment involved in the solution of the embodiment of the present invention.

[0092] As Figure 5 shown, the control device can include: a processor 1001, such as a central processing unit, a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. Among them, the communication bus 1002 is used to realize the connection and communication between these components. The user interface 1003 can include a display screen and an input unit such as a keyboard. Optionally, the user interface 1003 can also include a standard wired interface and a wireless interface. The network interface 1004 can optionally include a standard wired interface and a wireless interface. The memory 1005 can be a high-speed random access memory or a stable non-volatile memory, such as a disk memory. Optionally, the memory 1005 can also be a storage device independent of the aforementioned processor 1001.

[0093] Those skilled in the art can understand that Figure 5 the structure shown in [[ID=]] does not constitute a limitation on the control device, and may include more or fewer components than shown, or combine some components, or have different component arrangements.

[0094] As Figure 5 shown, the memory 1005 as a storage medium may include an operating system, a network communication device, a user interface device, and a control program for the cooking appliance.

[0095] In Figure 5 the control device shown, the network interface 1004 is mainly used for data communication with the network server; the user interface 1003 is mainly used for data interaction with the user; the processor 1001 and the memory 1005 in the control device of the present invention may be arranged in the control device, and the control device calls the control program for the cooking appliance stored in the memory 1005 through the processor 1001 and executes the control method for the cooking appliance provided by the embodiments of the present invention.

[0096] The embodiments of the present invention provide a control method for a cooking appliance. Referring to Figure 6 , Figure 6 it is a schematic flowchart of an embodiment of a control method for a cooking appliance of the present invention.

[0097] The control method of the pressure cooking appliance 100 includes the following steps:

[0098] Step S1: Receive the distance-related parameters detected by the detection device between the cookware 200 and the electromagnetic heating device 1.

[0099] The distance-related parameters may include parameters such as distance, resonance peak voltage parameter, resonance peak current parameter, etc. The resonance peak voltage parameter refers to the maximum voltage in the resonance curve of the electromagnetic heating device 1, and the resonance peak current parameter refers to the maximum current in the resonance curve of the electromagnetic heating device 1.

[0100] It should be noted that for the resonance peak voltage parameter and the resonance peak current parameter, the detection position may be within ±5% of the cycle time at the peak moment to make the acquisition of data more accurate.

[0101] Step S2: When the distance-related parameters meet the first preset condition, determine that the cookware 200 is in the state of being thrown.

[0102] Exemplarily, when the distance increases, it indicates that the cookware 200 has left the electromagnetic heating device 1. At this time, it can be considered that the cookware is in the state of being tossed. Generally, when the electromagnetic heating device 1 operates at the rated power and the cookware 200 is on the electromagnetic heating device 1, the resonant peak voltage parameter is almost the same within several consecutive resonant cycles. However, when the cookware 200 leaves the electromagnetic heating device 1, the heat consumption instantaneously decreases, and the resonant peak voltage will increase. Thus, it is possible to determine whether the cookware 200 is in the state of being tossed based on the change of the distance-related parameter.

[0103] Step S3: When the cookware 200 is in the state of being tossed, control the electromagnetic heating device 1 to operate at the toss power matched to the toss state.

[0104] It should be noted that in this embodiment, the toss state may refer to cooking forms in which the cookware 200 leaves the electromagnetic heating device 1 for a short time, such as tossing or flipping the cookware.

[0105] Thus, it is determined whether the cookware 200 is in the state of being tossed through the distance-related parameter. When in the toss state, control the electromagnetic heating device 1 to operate at the toss power. Thus, a proper power output is still maintained during the toss process instead of directly turning off the electromagnetic heating device 1. Therefore, when the cookware 200 returns close to the cooktop again, it is beneficial to quickly increase the heating power to the normal level. Furthermore, the cookware 200 can still have a certain heating power during the toss process, and the time for the power to recover to the normal level is significantly shortened, improving the user experience. It avoids the problem that when the cookware is tossed repeatedly in a short time, the heating is almost stopped during the toss process, affecting the cooking effect.

[0106] In an embodiment of the present invention, the distance-related parameter includes a resonant peak voltage-related parameter, and step S2 includes: when the resonant peak voltage-related parameters obtained in two adjacent times show an increasing trend, determine that the cookware 200 is in the state of being tossed.

[0107] The resonant peak voltage-related parameter may include the resonant peak voltage and / or the resonant peak current. Exemplarily, taking the resonant peak voltage as an example, generally, when the electromagnetic heating device 1 operates at the rated power and the cookware 200 is on the electromagnetic heating device 1, the resonant peak voltage parameter is almost the same. However, when the cookware 200 leaves the electromagnetic heating device 1, the heat consumption instantaneously decreases, and the resonant peak voltage will increase. At this time, it can be considered that the cookware 200 is in the state of being tossed. It can be understood that due to the inherent relationship between voltage and current, it is also possible to determine whether the cookware 200 is in the state of being tossed through the resonant peak current, and it is also possible to determine whether the cookware 200 is in the state of being tossed through the resonant peak voltage and the resonant peak current.

[0108] Such as Figure 7As shown, in the resonant voltage curve, if the resonant peak voltage obtained in the current acquisition is greater than that in the previous acquisition, for example, showing an upward trend. At this time, it can be determined that the cookware 200 is in the state of being thrown up. The unit of a single resonant curve is usually microseconds. Thus, the state of the cookware 200 can be accurately captured, making the control of the cooking appliance 100 more precise.

[0109] In an embodiment of the present invention, step S3 includes controlling the power of the electromagnetic heating device 1 to decrease when the cookware 200 is in the state of being thrown up.

[0110] When the cookware 200 leaves the electromagnetic heating device 1, the heat consumption instantaneously decreases, and the resonant peak voltage will increase. At this time, if the electromagnetic heating device 1 still operates at the rated power, there may be a voltage overpressure situation. Therefore, at this time, the power of the electromagnetic heating device 1 should be controlled to decrease, so that when the cookware 200 returns close to the stove surface again, it is beneficial to quickly increase the heating power to the normal level, and further enable the cookware 200 to still have a certain heating power during the process of being thrown up, and significantly shorten the time for the power to return to the normal level.

[0111] In an embodiment of the present invention, the electromagnetic heating device 1 includes a switching device, and step S3 includes: when the cookware 200 is in the state of being thrown up in the current resonant cycle, reducing the width of the driving pulse of the switching device in the next resonant cycle.

[0112] When the cookware 200 leaves the electromagnetic heating device 1, the heat consumption instantaneously decreases, and the resonant peak voltage will increase. At this time, if the electromagnetic heating device 1 still operates at the rated power, there may be a voltage overpressure situation. Therefore, at this time, the power of the electromagnetic heating device 1 should be controlled to decrease. In actual implementation, by adjusting the width of the driving pulse of the switching device, the power of the electromagnetic heating device 1 can be adjusted, and the width of the driving pulse of the switching device is positively correlated with the power of the electromagnetic heating device 1. Thus, referring to Figure 7 , the width of the driving pulse of the switching device in the next resonant cycle can be reduced from t1 to t1 - t0 to reduce the power of the electromagnetic heating device 1.

[0113] So that when the cookware 200 returns close to the stove surface again, it is beneficial to quickly increase the heating power to the normal level, and further enable the cookware 200 to still have a certain heating power during the process of being thrown up, and significantly shorten the time for the power to return to the normal level.

[0114] Referring to Figure 8 , in an embodiment of the present invention, after step S3, it further includes:

[0115] Step S4a: When the distance-related parameter satisfies the second preset condition, it is determined that the cookware 200 is in the state of returning to the pot.

[0116] Exemplarily, when the distance decreases to the minimum value, it indicates that the pot returns to the electromagnetic heating device 1. At this time, it can be considered to be in the state of the pot returning. Generally, when the electromagnetic heating device 1 operates at the rated power and the cookware 200 is on the electromagnetic heating device 1, the resonant peak voltage parameter is almost the same in several consecutive resonant cycles. When the cookware 200 leaves the electromagnetic heating device 1, the heat consumption instantaneously decreases, and the resonant peak voltage will increase. When the cookware 200 returns to the electromagnetic heating device 1 again, the heat consumption instantaneously increases, and the resonant peak voltage will instantaneously decrease. Therefore, it is possible to judge whether the cookware 200 is in the state of the pot returning by the change of the distance-related parameter.

[0117] Step S5a: When the cookware 200 is in the state of the pot returning, control the electromagnetic heating device 1 to operate at the first pot-returning power matched with the pot-returning state.

[0118] After the cookware 200 returns from the state of throwing the pot to the state of the pot returning, at this time, the working state of the electromagnetic heating device 1 should be adjusted, such as the power increase in the next resonant cycle, etc., to meet the cooking requirements after the pot returns.

[0119] In an embodiment of the present invention, the distance-related parameter includes a resonant peak voltage-related parameter;

[0120] Step S4a includes: When the resonant peak voltage-related parameters obtained twice in succession show a decreasing trend, it is determined that the cookware 200 is in the state of the pot returning.

[0121] See Figure 9 , taking the resonant peak voltage as an example. Generally, when the cookware 200 leaves the electromagnetic heating device 1 and then returns to the electromagnetic heating device 1, heat will be consumed. In the resonant voltage curve, if the resonant peak voltage obtained this time is less than the previous resonant peak voltage in the adjacent two obtained resonant peak voltages, that is, it shows a decreasing trend. At this time, it can be determined that the cookware 200 is in the state of the pot returning. The unit of a resonant curve is usually microseconds. Therefore, the state of the cookware 200 can be accurately captured, making the control of the cooking appliance 100 more precise.

[0122] In an embodiment of the present invention, step S5a includes: When the cookware 200 is in the state of the pot returning, control the power of the electromagnetic heating device 1 to increase.

[0123] When the cookware 200 leaves the electromagnetic heating device 1 and then returns to the electromagnetic heating device 1, heat will be consumed. At this time, the power of the electromagnetic heating device 1 should be increased to meet the cooking requirements.

[0124] In an embodiment of the present invention, the electromagnetic heating device 1 includes a switching device, and step S5 includes: when the cookware 200 is in the state of returning to the pot during the current resonance period, increasing the width of the driving pulse of the switching device in the next resonance period.

[0125] In actual implementation, by adjusting the width of the driving pulse of the switching device, the power of the electromagnetic heating device 1 can be adjusted, and the width of the driving pulse of the switching device is positively correlated with the power of the electromagnetic heating device 1. Thus, referring to Figure 9 , the width of the driving pulse of the switching device in the next resonance period can be increased to increase the power of the electromagnetic heating device 1.

[0126] Referring to Figure 10 , in an embodiment of the present invention, after step S3, the following is further included:

[0127] Step S4b: When the distance-related parameter meets the third preset condition, it is determined that the cookware 200 is in the state of leaving the pot.

[0128] When the cookware 200 is in the state of throwing the pot, if the cookware 200 does not return to the electromagnetic heating device 1 for a long time, actually at this time the cookware 200 is in the state of leaving the pot. Exemplarily, when the cookware 200 has entered the state of throwing the pot, the width of the driving pulse of the switching device of the electromagnetic heating device 1 has been adjusted to decrease. If the cookware 200 does not return to the electromagnetic heating device 1 for a long time, for example, the change rate of the resonant peak voltage may change very little. At this time, the distance-related parameter can be used to determine whether the cookware 200 is in the state of leaving the pot.

[0129] It can be understood that in the present invention, the main difference between the state of throwing the pot and the state of leaving the pot is that the time when the cookware 200 leaves the electromagnetic heating device 1 is different, which can be reflected in the distance-related parameter.

[0130] Step S5b: When the cookware 200 is in the state of leaving the pot, controlling the electromagnetic heating device 1 to work at the off-pot power matching the state of leaving the pot.

[0131] At this time, a relatively small width of the driving pulse of the switching device can maintain multiple resonance periods. In order not to waste energy, the electromagnetic heating device 1 should be controlled to work in the state of leaving the pot, for example, the switching device is not turned on in the next resonance period, or the switching device is not turned on in the next few resonance periods, etc.

[0132] In an embodiment of the present invention, the electromagnetic heating device 1 includes a switching device, and the distance-related parameter includes a resonant peak voltage-related parameter. Step S4b includes:

[0133] When the width of the driving pulse of the switching device is less than a preset width threshold and the change value between the resonance peak voltage related parameters obtained twice in succession is less than a first threshold, it is determined that the cookware 200 is in the off-cookware state.

[0134] It should be noted that when the cookware 200 is in the state of throwing the cookware and has not entered the state of returning to the cookware, after the cookware 200 leaves, due to the reduction of heat consumption, the resonance peak voltage of several consecutive resonance cycles may be in a continuously increasing state. Therefore, the width of the driving pulse of the switching device in each resonance cycle will continuously decrease. After the width of the driving pulse of the switching device in the resonance cycle decreases to, for example, 3 milliseconds, if the resonance peak voltage in the next resonance cycle still shows an increase, it is no longer possible or necessary to continuously decrease the width of the driving pulse of the switching device in the resonance cycle. And at this time, the change between the resonance peak voltage related parameters obtained twice in succession decreases after several increases. Whether it is an increase or a decrease, because it is in the off-cookware state, the energy consumption is small, and the change value between the resonance peak voltage related parameters is also small. Therefore, it can be confirmed that the cookware 200 is in the off-cookware state when the width of the driving pulse of the switching device in the resonance cycle has been reduced to, for example, the minimum threshold, and the change value between the resonance peak voltage related parameters obtained twice in succession is less than the first threshold.

[0135] In an embodiment of the present invention, step S5b includes: when the cookware 200 is in the off-cookware state, controlling the power of the electromagnetic heating device 1 to be zero.

[0136] It is precisely because of the off-cookware state that the energy consumption is small, and the change value between the resonance peak voltage related parameters in multiple resonance cycles is also small. At this time, the power of the electromagnetic heating device 1 can be controlled to be zero to reduce energy loss and avoid the phenomenon of overvoltage.

[0137] In an embodiment of the present invention, the electromagnetic heating device 1 includes a switching device, and step S5b includes: when the cookware 200 is in the off-cookware state in the current resonance cycle, controlling the width of the driving pulse of the switching device in the subsequent N resonance cycles to be zero, where N≥1.

[0138] It is precisely because of the off-cookware state that the energy consumption is small, and the change value between the resonance peak voltage related parameters in multiple resonance cycles is also small. At this time, the width of the driving pulse of the switching device in the subsequent N resonance cycles can be zero, where N≥1, that is, a non-zero width of the driving pulse of the switching device can be maintained for N resonance cycles, thereby reducing energy loss and avoiding the phenomenon of overvoltage. In the implementation process, N can be set to 1, 2, 3, 4, 5, etc., and this embodiment does not specifically limit this. For example, see Figure 11 , set N to 1.

[0139] SeeFigure 12 , in an embodiment of the present invention, after the step S5b, the following steps are further included:

[0140] Step S6b: When the distance-related parameter satisfies the fourth preset condition, it is determined that the cookware 200 is in the state of returning to the pot.

[0141] After the electromagnetic heating device 1 is not turned off and the cookware 200 leaves the pot, it may return to the electromagnetic heating device 1 again. Therefore, it is possible to continue to judge whether the cookware 200 has returned to the pot according to the distance-related parameter.

[0142] Step S7b: When the cookware 200 is in the state of returning to the pot, control the electromagnetic heating device 1 to work at the second return power matching the return state.

[0143] When the cookware 200 returns from the state of throwing the pot to the state of returning to the pot, at this time, the working state of the electromagnetic heating device 1 should be adjusted, such as increasing the power in the next resonance period, etc., to meet the cooking requirements after returning to the pot.

[0144] In an embodiment of the present invention, the distance-related parameter includes a resonance peak voltage-related parameter;

[0145] The step S6b includes: when the resonance peak voltage-related parameters obtained twice in succession show a decreasing trend, and the decrease value of the resonance peak voltage-related parameters obtained twice in succession is greater than the second threshold value, it is determined that the cookware 200 is in the state of returning to the pot.

[0146] When the cookware 200 leaves the electromagnetic heating device 1 and then returns to the electromagnetic heating device 1, heat will be consumed. In the resonance voltage curve, if the resonance peak voltage obtained this time is less than the previous resonance peak voltage, and the decrease value is greater than the second threshold value, for example. At this time, it can be determined that the cookware 200 is in the state of returning to the pot.

[0147] In an embodiment of the present invention, the step S7b includes: when the cookware 200 is in the state of returning to the pot, control the power of the electromagnetic heating device 1 to be greater than zero.

[0148] When the cookware 200 leaves the electromagnetic heating device 1 and then returns to the electromagnetic heating device 1, heat will be consumed. At this time, the power of the electromagnetic heating device 1 should be increased to meet the cooking requirements.

[0149] In an embodiment of the present invention, the electromagnetic heating device 1 includes a switching device, and the step S7b includes: when the cookware 200 is in the state of returning to the pot in the current resonance period, increase the width of the driving pulse of the switching device in the next resonance period.

[0150] In actual implementation, by adjusting the width of the drive pulse of the switching device, the power of the electromagnetic heating device 1 can be adjusted, and the width of the drive pulse of the switching device is positively correlated with the power of the electromagnetic heating device 1. Thus, the width of the drive pulse of the switching device in the next resonance period can be increased to adjust the power of the electromagnetic heating device 1 to be non-zero. Exemplarily, the width of the drive pulse of the switching device in the next resonance period can be adjusted to be the same as the width of the last drive pulse of the switching device that is non-zero.

[0151] It should be understood that the above is only an example and does not constitute any limitation to the technical solution of the present invention. In specific applications, those skilled in the art can set according to needs, and the present invention does not limit this.

[0152] It should be noted that the above-described working process is only illustrative and does not limit the protection scope of the present invention. In actual applications, those skilled in the art can select some or all of them according to actual needs to achieve the purpose of the solution of this embodiment, and this is not limited here.

[0153] The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0154] Through the description of the above embodiments, those skilled in the art can clearly understand that the above embodiment methods can be implemented by means of software plus a necessary general hardware platform. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as a read-only memory (ROM) / RAM, magnetic disk, optical disk), and includes several instructions to enable a terminal device (which can be a mobile phone, computer, server, or network device, etc.) to execute the methods described in various embodiments of the present invention.

[0155] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made by using the content of the specification and drawings of the present invention under the inventive concept of the present invention, or direct / indirect application in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A control method for a cooking appliance, characterized in that, the cooking appliance includes an electromagnetic heating device, a detection device, and a control device. The electromagnetic heating device is used to perform electromagnetic heating on a cookware. The detection device is used to detect distance-related parameters between the cookware and the electromagnetic heating device. The control device is electrically connected to the electromagnetic heating device and the detection device; the control method for the cooking appliance includes: receiving the distance-related parameters between the cookware and the electromagnetic heating device detected by the detection device; when the distance-related parameters meet a first preset condition, determining that the cookware is in a tossing state; when the cookware is in the tossing state, controlling the electromagnetic heating device to work at a tossing power matching the tossing state.

2. The control method for the cooking appliance according to claim 1, characterized in that, the distance-related parameters include resonance peak voltage-related parameters; the step of determining that the cookware is in the tossing state when the distance-related parameters meet the first preset condition includes: when the resonance peak voltage-related parameters obtained in two adjacent times show an increasing trend, determining that the cookware is in the tossing state.

3. The control method for the cooking appliance according to claim 2, characterized in that, the step of controlling the electromagnetic heating device to work at a tossing power matching the tossing state when the cookware is in the tossing state includes: when the cookware is in the tossing state, controlling the power of the electromagnetic heating device to decrease.

4. The control method for the cooking appliance according to claim 2, characterized in that, the electromagnetic heating device includes a switching device, the step of controlling the power of the electromagnetic heating device to decrease when the cookware is in the tossing state includes: when the cookware is in the tossing state in the current resonance cycle, reducing the width of the driving pulse of the switching device in the next resonance cycle.

5. The control method for the cooking appliance according to claim 1, characterized in that, after the step of controlling the electromagnetic heating device to work at a tossing power matching the tossing state when the cookware is in the tossing state, it further includes: when the distance-related parameters meet a second preset condition, determining that the cookware is in a returning state; when the cookware is in the returning state, controlling the electromagnetic heating device to work at a first returning power matching the returning state.

6. The control method for the cooking appliance according to claim 5, characterized in that, the distance-related parameters include resonance peak voltage-related parameters; the step of determining that the cookware is in the tossing state when the distance-related parameters meet the second preset condition includes: when the resonance peak voltage-related parameters obtained in two adjacent times show a decreasing trend, determining that the cookware is in the returning state.

7. The control method for the cooking appliance according to claim 6, characterized in that, the step of controlling the electromagnetic heating device to work at a first returning power matching the returning state when the cookware is in the returning state includes: when the cookware is in the returning state, controlling the power of the electromagnetic heating device to increase.

8. The control method for the cooking appliance according to claim 6, characterized in that, the electromagnetic heating device includes a switching device, the step of controlling the electromagnetic heating device to work at a first returning power matching the returning state when the cookware is in the returning state includes: When the cookware is in the state of returning to the pot during the current resonance period, increase the width of the driving pulse of the switching device in the next resonance period.

9. The control method of a cooking appliance according to claim 1, wherein, after the step of controlling the electromagnetic heating device to operate at a flipping power matching the flipping state when the cookware is in the flipping state, further includes: when the distance-related parameter satisfies a third preset condition, it is determined that the cookware is in the state of leaving the pot; when the cookware is in the state of leaving the pot, control the electromagnetic heating device to operate at a leaving-pot power matching the leaving-pot state.

10. The control method of a cooking appliance according to claim 9, wherein, the electromagnetic heating device includes a switching device, and the distance-related parameter includes a resonance peak voltage-related parameter; the step of determining that the cookware is in the state of leaving the pot when the distance-related parameter satisfies a third preset condition includes: when the width of the driving pulse of the switching device is less than a preset width threshold and the change value between two adjacent acquired resonance peak voltage-related parameters is less than a first threshold, it is determined that the cookware is in the state of leaving the pot.

11. The control method of a cooking appliance according to claim 9, wherein, the step of controlling the electromagnetic heating device to operate at a leaving-pot power matching the leaving-pot state when the cookware is in the state of leaving the pot includes: when the cookware is in the state of leaving the pot, control the power of the electromagnetic heating device to be zero.

12. The control method of a cooking appliance according to claim 9, wherein, the electromagnetic heating device includes a switching device, and the step of controlling the electromagnetic heating device to operate at a leaving-pot power matching the leaving-pot state when the cookware is in the state of leaving the pot includes: when the cookware is in the state of leaving the pot during the current resonance period, control the width of the driving pulse of the switching device in the subsequent N resonance periods to be zero, N≥1.

13. The control method of a cooking appliance according to claim 9, wherein, after the step of controlling the electromagnetic heating device to operate at a leaving-pot power matching the leaving-pot state when the cookware is in the state of leaving the pot, further includes: when the distance-related parameter satisfies a fourth preset condition, it is determined that the cookware is in the state of returning to the pot; when the cookware is in the state of returning to the pot, control the electromagnetic heating device to operate at a second returning-pot power matching the returning-pot state.

14. The control method of a cooking appliance according to claim 13, wherein, the distance-related parameter includes a resonance peak voltage-related parameter; the step of determining that the cookware is in the state of returning to the pot when the distance-related parameter satisfies a fourth preset condition includes: when two adjacent acquired resonance peak voltage-related parameters show a decreasing trend and the decrease value of the two adjacent acquired resonance peak voltage-related parameters is greater than a second threshold, it is determined that the cookware is in the state of returning to the pot.

15. The control method of a cooking appliance according to claim 13, wherein, the step of controlling the electromagnetic heating device to operate at a second returning-pot power matching the returning-pot state when the cookware is in the state of returning to the pot includes: when the cookware is in the state of returning to the pot, control the power of the electromagnetic heating device to be greater than zero.

16. The control method of a cooking appliance according to claim 13, wherein, The electromagnetic heating device includes a switching device. The step of controlling the electromagnetic heating device to operate at a second re-boiling power matched to the re-boiling state when the cookware is in the re-boiling state includes: When the cookware is in the re-boiling state during the current resonance period, increasing the width of the driving pulse of the switching device in the next resonance period.

17. The control method according to claim 1, wherein, The resonance peak voltage related parameters include the resonance peak voltage and / or the resonance peak current.

18. A cooking appliance, wherein, The cooking appliance includes: An electromagnetic heating device for electromagnetic heating of the cookware; A detection device for detecting distance related parameters between the cookware and the electromagnetic heating device, and A control device electrically connected to the electromagnetic heating device and the detection device. The control device includes a memory, a processor, and a control program of the cooking appliance stored on the memory and executable on the processor. The control program of the cooking appliance is configured to implement the steps of the control method of the cooking appliance according to any one of claims 1 to 10.

19. The cooking appliance according to claim 18, wherein, The electromagnetic heating device includes a switching device.

20. The cooking appliance according to claim 18 or 19, wherein, The cooking appliance includes an induction cooker.

21. The cooking appliance according to claim 18, wherein, The electromagnetic heating device includes a coil assembly. The coil assembly includes a bracket and a coil unit. The bracket has a first side and a second side that are opposite in a first direction. The coil unit includes a multi-turn coil. Each turn of the coil includes a first wire segment and a second wire segment with opposite currents and connected to each other. The multi-turn coil is wound around the first side and the second side of the bracket so that a plurality of the first wire segments are distributed on the first side of the bracket and a plurality of second wire segments are distributed on the second side of the bracket.

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