Heating control method and device of cooking equipment, storage medium and cooking equipment

Abstract

The invention provides a heating control method and device of cooking equipment, a storage medium and the cooking equipment, and relates to the technical field of cooking equipment.The cooking equipment comprises a coil assembly and N switching devices arranged in parallel, the N switching devices are electrically connected with the coil assembly, the coil assembly is used for heating cookware, N is a positive integer larger than or equal to 2, and N is a positive integer larger than or equal to 2. The method comprises the steps that in response to a cooking instruction, the magnetic permeability of a pot is obtained, and the cooking instruction indicates target heating power; and according to the magnetic permeability and the target heating power, at least one of the N switching devices is controlled to work, so that the coil assembly forms an eddy current in the cookware, or the coil assembly emits heat and heats the cookware.

Description

Technical Field

[0001] The present invention relates to the technical field of cooking appliances, and in particular, to a heating control method, device, storage medium, and cooking appliance for a cooking appliance. Background Art

[0002] In the related art, induction heating appliances such as induction cooktops belong to flameless heating, with fast heating speed and high safety. However, induction heating appliances have poor compatibility with the material and shape of cookware. For example, they can achieve better heating power and heating effect for metal cookware with high magnetic permeability, while for cookware with low magnetic permeability, such as non-metal cookware, they cannot heat, and the versatility of induction heating cooking appliances is poor. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art or related technologies.

[0004] To this end, a first aspect of the present invention provides a heating control method for a cooking appliance.

[0005] A second aspect of the present invention provides a heating control device for a cooking appliance.

[0006] A third aspect of the present invention provides a heating control device for a cooking appliance.

[0007] A fourth aspect of the present invention provides a readable storage medium.

[0008] A sixth aspect of the present invention provides a cooking appliance.

[0009] In view of this, a first aspect of the present invention provides a heating control method for a cooking appliance. The cooking appliance includes a coil assembly and N switch devices connected in parallel. The N switch devices are all electrically connected to the coil assembly. The coil assembly is used to heat a cookware. N is a positive integer greater than or equal to 2. The method includes: in response to a cooking instruction, obtaining the magnetic permeability of the cookware, where the cooking instruction indicates a target heating power; and controlling at least one of the N switch devices to operate according to the magnetic permeability and the target heating power, so that an eddy current is formed in the cookware by the coil assembly, or the coil assembly generates heat and heats the cookware.

[0010] In this technical solution, the cooking appliance may be an induction heating induction cooktop, a multi-head stove, a rice cooker, an electric pressure cooker, or other cooking appliances. The cooking appliance includes a coil assembly and N switch devices connected in parallel. The N switch devices are all electrically connected to the coil assembly. When any one of the N switch devices connected in parallel is closed, the input current can be supplied to the coil assembly to charge the coil assembly.

[0011] Exemplarily, the switching device is a high-frequency power inverter switching device, such as an IGBT (Insulated Gate Bipolar Transistor) switching device or a MOS (Metal Oxide Semiconductor) switching device.

[0012] Exemplarily, N switching devices can be electrically connected to the coil assembly through a reactive power compensation resonance circuit. A resonance capacitor is provided in the reactive power compensation resonance circuit. Optionally, the number of resonance capacitors can be the same as the number of switching devices. Through the high-frequency switching action of the switching devices, oscillations are generated between the coil assembly and the resonance capacitor, and eddy currents can be generated in a metal cookware with high magnetic permeability, thereby realizing the heating of the cookware.

[0013] In the related art, traditional induction heating appliances are only applicable to metal cookware with high magnetic permeability, while for cookware with relatively low magnetic permeability, such as some non-metal cookware, including ceramic cookware, casserole cookware, glass cookware, etc., they cannot be heated at all, resulting in poor versatility of induction heating appliances.

[0014] In view of the above problems, when the technical solution of this application receives a cooking instruction, it first determines the magnetic permeability of the current cookware to be heated. Exemplarily, after the user places the cookware on the cooking device, the cooking device controls the coil to operate at a predetermined frequency and detects the temperature rise value of the cookware, and determines the cookware type and the magnetic permeability of the cookware according to the temperature rise value of the cookware.

[0015] Exemplarily, a cookware detection sensor is provided on the cooking device, and the cookware type and the magnetic permeability of the cookware are detected through the cookware detection sensor. Among them, exemplarily, the cookware detection sensor includes an infrared sensor, a magnetic detection sensor, a metal sensor, a microwave sensor or an image sensor.

[0016] Exemplarily, a label for recording the cookware type and the magnetic permeability of the cookware is provided on the cookware. Exemplarily, the label can be a Near Field Communication (NFC) label, a graphic code label or a magnetic stripe label. An identification device for reading the label is provided on the cooking device, and the cookware type and the magnetic permeability of the cookware are determined by reading the information in the label on the cookware.

[0017] Exemplarily, the cooking device can receive the cookware type input by the user through a human-machine interaction interface, and the cooking device determines the magnetic permeability of the cookware according to the cookware type selected by the user and by referring to a comparison table of pre-stored cookware types and magnetic permeabilities.

[0018] When the magnetic permeability of the cookware is relatively high, such as for traditional metal cookware used on induction cookers, the coil assembly can generate eddy currents on the cookware through resonance with the resonant capacitor. The eddy currents act on the resistance of the cookware itself, causing the cookware to generate heat on its own, thus achieving heating of the cookware.

[0019] When the magnetic permeability of the cookware is relatively low, such as some metal cookware with low magnetic permeability or some non-metal cookware, eddy currents cannot be generated on the cookware through the resonance between the coil assembly and the resonant capacitor. For this situation, the resonance frequency between the coil assembly and the resonant capacitor can be increased to increase the coil impedance, so that the coil generates heat during high-frequency resonance, and the heat generated by the coil is used to heat the cookware.

[0020] Specifically, since the coil itself has a certain impedance, when a high-frequency resonant current passes through the coil, the coil itself will generate heat due to the action of its own impedance. When the coil assembly and the resonant capacitor resonate at a higher resonant frequency, the impedance value of the coil itself will increase significantly. After the impedance of the coil increases, the heat generated when the current passes through the coil will also increase accordingly. Therefore, the coil itself can generate sufficient heat, and this heat is transferred to the cookware of the cooking appliance, thus achieving heating of the cookware by the heat generated by the coil.

[0021] Since the switching frequency of the switching device itself is limited, and the cost of a switching device capable of achieving ultra-high-frequency switching is often dozens of times that of an ordinary switching device. In this regard, the embodiments of the present application increase the number of switching devices, specifically by setting N switch components connected in parallel. When the switching frequency of a single switching device cannot meet the requirement of heating the cookware by the heat generated by the coil, the parallel-connected switching devices can be controlled to switch sequentially, so as to equivalently obtain a higher switching frequency without using an ultra-high-frequency switching device whose cost far exceeds that of an ordinary switching device.

[0022] The technical solution of the present application can select different heating methods according to the magnetic permeability of the cookware. When the magnetic permeability of the cookware is relatively low, a higher oscillation frequency is obtained through the cooperation of multiple parallel-connected switching devices to increase the impedance of the coil itself. By increasing the impedance of the coil itself, the coil generates heat, and the heat generated by the coil is used to heat the cookware, enabling the induction heating cooking appliance to heat non-metal cookware under effective cost control, and improving the versatility of the induction heating cooking appliance.

[0023] In addition, the heating control method in the above technical solution provided by the present invention may further have the following additional technical features:

[0024] In some technical solutions of the present application, optionally, the step of controlling at least one of the N switching devices to operate according to the magnetic permeability and the target heating power, so that an eddy current is formed in the cookware by the coil assembly, or the coil assembly generates heat and heats the cookware, specifically includes:

[0025] When the magnetic permeability is greater than or equal to the first magnetic permeability threshold, control M of the N switching devices to synchronously switch at the first switching frequency according to the target heating power, so that an eddy current is formed in the cookware by the coil assembly, where M is a positive integer less than or equal to N; or

[0026] When the magnetic permeability is less than the first magnetic permeability threshold, control the N switching devices to alternately switch at the second switching frequency according to the target heating power, so that the coil assembly generates heat and heats the cookware.

[0027] In this technical solution, the first magnetic permeability threshold is the magnetic permeability threshold for whether induction heating can be used for the current cookware. When the magnetic permeability of the cookware is higher than or equal to the first magnetic permeability threshold, an eddy current can be generated on the cookware through the resonance between the coil assembly and the resonant capacitor, so that the cookware generates heat by itself and realizes the heating of the cookware.

[0028] When the magnetic permeability of the cookware is lower than the first magnetic permeability threshold, an eddy current cannot be generated on the cookware through the resonance between the coil assembly and the resonant capacitor. At this time, the impedance of the coil assembly can be increased by increasing the resonance frequency between the coil assembly and the resonant capacitor, so that the coil assembly can generate heat by itself to heat the cookware.

[0029] Specifically, when the magnetic permeability of the cookware is higher than the first magnetic permeability threshold, one of the N switching devices (i.e., M = 1) can be controlled to switch at a switching frequency matching the target heating power, or multiple of the N switching devices (i.e., M > 1) can be controlled to synchronously switch at the first switching frequency matching the target heating power, and an eddy current is generated on the cookware through the oscillation between the coil and the resonant capacitor to heat the cookware.

[0030] Exemplarily, the range of the first switching frequency is 20 kHz to 50 kHz.

[0031] When the magnetic permeability of the cookware is lower than the first magnetic permeability threshold, control the N switching devices to alternately switch at the second switching frequency. For example, assuming N = 3, that is, when there are 3 switching devices, first control the first switching device to perform a switching action. After the first switching device performs a switching action, immediately let the second switching device perform a switching action. After the second switching device performs a switching action, immediately let the third switching device perform a switching action. At this time, a switching cycle is completed, and this cycle is repeated.

[0032] Since the N switching devices are connected in parallel, when one of the switching devices performs a switching action, the coil assembly and the resonant capacitor can generate a resonance once. When the N switching devices alternately perform switching actions, the coil assembly and the resonant capacitor can generate N resonances within one switching period. Therefore, without increasing the switching frequency of each switching device, the resonance frequency between the coil assembly and the resonant capacitor is increased, the impedance of the coil assembly is further improved, and the heating efficiency of the coil assembly is increased.

[0033] Exemplarily, let N = 5, that is, the number of switching devices is 5. Then the range of the second switching frequency is from 10 kHz to 100 kHz, and at this time, the equivalent switching frequency of the N switching devices is from 50 kHz to 500 kHz.

[0034] The technical solution of the present application enables the coil assembly and the resonant capacitor to resonate at a higher frequency in the way of alternately switching N switching devices arranged in parallel without increasing the switching frequency of a single switching device, thereby causing the coil assembly to heat itself and realizing effective heating of cookware with low magnetic permeability.

[0035] In some technical solutions of the present application, optionally, the second switching frequency includes a first sub-switching frequency and a second sub-switching frequency, and the first sub-switching frequency is less than the second sub-switching frequency; in the case where the magnetic permeability is less than the first magnetic permeability threshold, the step of controlling the N switching devices to alternately switch at the second switching frequency according to the target heating power specifically includes:

[0036] In the case where the magnetic permeability is less than the first magnetic permeability threshold and greater than or equal to the second magnetic permeability threshold, controlling the N switching devices to alternately switch at the first sub-switching frequency according to the target heating power; or in the case where the magnetic permeability is less than the second magnetic permeability threshold, controlling the N switching devices to alternately switch at the second sub-switching frequency according to the target heating power.

[0037] In this technical solution, for cookware with a magnetic permeability lower than the first magnetic permeability threshold, it can be subdivided into cookware with a magnetic permeability lower than the first magnetic permeability but higher than the second magnetic permeability, and cookware with a magnetic permeability lower than the second magnetic permeability.

[0038] Among them, when the magnetic permeability of a cookware is lower than the first magnetic permeability but higher than the second magnetic permeability, such as some metal cookware with low magnetic permeability, the N switching devices alternately switch at the first sub-switching frequency. At this time, both the impedance of the coil assembly and the impedance of the cookware with low magnetic permeability are increased. At this time, the coil assembly generates heat, and the cookware itself also generates heat, that is, heating is performed simultaneously through the heat of the coil and the heat generation of the cookware.

[0039] Exemplarily, let N = 5, that is, the number of switching devices is 5. Then the range of the first sub-switching frequency is from 10 kHz to 200 kHz, and at this time, the equivalent switching frequency of the N switching devices is from 50 kHz to 100 kHz.

[0040] When the magnetic permeability of a cookware is lower than the second magnetic permeability, the cookware cannot generate heat through induction heating. For example, for some non-metal cookwares, the N switching devices respectively switch alternately at a higher second sub-switching frequency. At this time, the impedance value of the coil assembly is further increased to make the coil assembly generate heat, and heating is carried out by the heat generated by the coil.

[0041] Exemplarily, let N = 5, that is, the number of switching devices is 5. Then the range of the first sub-switching frequency is from 20 kHz to 100 kHz, and at this time, the equivalent switching frequency of the N switching devices is from 100 kHz to 500 kHz.

[0042] The technical solution of the present application combines induction heating and coil heating when the cookware is a metal cookware with low magnetic permeability, which can improve the heating efficiency of the low-magnetic-permeability cookware. When the cookware is a non-metal cookware, a higher oscillation frequency is obtained through the cooperation of multiple parallel switching devices to increase the impedance of the coil itself and increase the heat generation of the coil, so that the induction heating cooking device can effectively heat various types of cookwares and improve the versatility of the induction heating cooking device.

[0043] In some technical solutions of the present application, optionally, the heating control method further includes: obtaining the operating condition data of the switching device; adjusting the switching frequency of the switching device and / or the duty cycle of the switching device according to the comparison result between the operating condition data and the operating condition threshold.

[0044] In this technical solution, the operating condition data of the switching device indicates whether there is a risk of damage to the switching device, and the operating condition threshold is the threshold that can ensure the stable operation of the switching device. After controlling the switching device to switch and operate at the corresponding switching frequency according to the cookware type and the target heating power, the cooking device continuously collects the operating condition data of the switching device and compares the collected operating condition data with the operating condition threshold.

[0045] Optionally, the above operating condition threshold is associated with the electrical parameters of the switching device and the target heating power.

[0046] When the operating condition data of the switching device exceeds the operating condition threshold, it indicates that the switching device is in an unfavorable operating condition and there is a risk of damage. At this time, the operating state of the switching device is adjusted to reduce the operating pressure of the switching device.

[0047] Exemplarily, when the operating condition data of the switching device exceeds the operating condition threshold, the switching frequency of the switching device is adjusted, specifically, the switching frequency of the switching device is increased to reduce the power and the pressure on the switching device.

[0048] Exemplarily, when the operating condition data of the switching device exceeds the operating condition threshold, the duty cycle of the switching device is adjusted, specifically, the duty cycle of the switching device is reduced, so as to reduce the power and the pressure on the switching device.

[0049] The technical solution of the present application dynamically adjusts the operating parameters of the switching device according to the operating condition data of the switching device, so that the switching device can maintain a relatively balanced operating condition and improve the stability of the switching device.

[0050] In some technical solutions of the present application, optionally, the operating condition data includes: voltage value, current value, and temperature value; the operating condition threshold includes: voltage threshold, current threshold, and temperature threshold.

[0051] In this technical solution, the operating condition data includes a voltage value, which is specifically the voltage value at the high-voltage end of the switching device. Correspondingly, the operating condition threshold includes a voltage threshold, which is the maximum voltage value that the high-voltage end of the switching device can withstand. When the voltage value at the high-voltage end of the switching device is greater than the voltage threshold, it indicates that the switching device has a risk of damage. At this time, parameters such as the switching frequency and duty cycle of the switching device are adjusted to reduce the power consumption.

[0052] It can be understood that N switching devices are connected in parallel, so the voltage values at the high-voltage ends of the N switching devices are the same.

[0053] The operating condition data further includes a current value, which is specifically the current value at the high-voltage end of the switching device. Correspondingly, the operating condition threshold includes a current threshold, which is the maximum current value that the switching device can withstand. When the current value at the high-voltage end of any one of the switching devices is greater than the current threshold, it indicates that the switching device has a risk of damage. At this time, parameters such as the switching frequency and duty cycle of all the switching devices are adjusted to reduce the power consumption.

[0054] The operating condition data further includes a temperature value, and the operating condition threshold includes a temperature threshold, which is the maximum temperature value that the switching device can withstand. When the temperature value of any one of the switching devices is greater than the temperature threshold, it indicates that the switching device has a risk of burning out. At this time, parameters such as the switching frequency and duty cycle of all the switching devices are adjusted to reduce the power consumption.

[0055] The technical solution of the present application collects the voltage value and current value at the high-voltage end of the switching device, as well as the temperature value of the switching device, and dynamically adjusts the operating parameters of the switching device by judging whether the corresponding operating condition parameters exceed the corresponding thresholds, which can ensure the reliability of the switching device.

[0056] In some technical solutions of the present application, optionally, the heating control method further includes: obtaining the heating power of the coil assembly; adjusting the switching frequency and / or the duty cycle of the switching device according to the comparison result between the heating power and the target heating power.

[0057] In this technical solution, after controlling the switching device to switch and operate at the corresponding switching frequency according to the cookware type and the target heating power, the cooking device continuously collects the actual heating power of the coil assembly and determines whether the actual heating power meets the target heating power set by the user.

[0058] Specifically, the factors affecting the heating power include the switching frequency of the switching device and the duty cycle of the switching device. Therefore, when the actual heating power of the coil assembly is less than the target heating power, the switching frequency of the switching device can be correspondingly reduced, or the duty cycle of the switching device can be increased, or the operations of reducing the switching frequency and increasing the duty cycle can be performed simultaneously, so as to increase the heating power of the coil assembly.

[0059] It can be understood that when the actual heating power of the coil assembly is greater than the target heating power, the switching frequency of the switching device can be correspondingly reduced, or the duty cycle of the switching device can be increased, or the operations of increasing the switching frequency and reducing the duty cycle can be performed simultaneously, so as to reduce the heating power of the coil assembly.

[0060] The technical solution of the present application collects the actual heating power of the coil assembly and dynamically adjusts the working parameters of the switching device based on the comparison result between the actual heating power and the target heating power set by the user, so that the actual heating power can be maintained within a range matching the target heating power set by the user, ensuring the heating effect of the cooking device.

[0061] In some technical solutions of the present application, optionally, the step of obtaining the magnetic permeability of the cookware specifically includes: determining the cookware type according to the cookware selection input; determining the magnetic permeability according to the cookware type.

[0062] In this technical solution, when the user uses the cooking device, the user can perform a cookware selection input through the human-computer interaction panel of the cooking device. Exemplarily, the cooking device presets multiple cookware types, such as stainless steel cookware, casserole, enamel cookware, aluminum cookware, etc.

[0063] The user selects the type of the currently used cookware, and the cooking device determines the magnetic permeability of the current cookware according to the mapping table of the preset cookware type and the cookware magnetic permeability.

[0064] The technical solution of the present application determines the cookware magnetic permeability through the type of cookware selected by the user, without adding additional sensors, which is beneficial to controlling the cost of the cooking device.

[0065] The second aspect of the present application provides a heating control device for a cooking appliance. The cooking appliance includes a coil assembly and N switch devices arranged in parallel, and the N switch devices are all electrically connected to the coil assembly. The coil assembly is used to heat a cookware, where N is a positive integer greater than or equal to 2. The heating control device includes:

[0066] An acquisition module, configured to acquire the permeability of the cookware in response to a cooking instruction, where the cooking instruction indicates a target heating power; a control module, configured to control at least one of the N switch devices to operate according to the permeability and the target heating power, so that an eddy current is formed in the cookware by the coil assembly, or the coil assembly generates heat and heats the cookware.

[0067] In this technical solution, the cooking appliance can be an induction heating electromagnetic cooker, a multi-head stove, a rice cooker, an electric pressure cooker, or other cooking appliances. The cooking appliance includes a coil assembly and N switch devices arranged in parallel, and the N switch devices are all electrically connected to the coil assembly. When any one of the N switch devices arranged in parallel is closed, the input current can be supplied to the coil assembly to charge the coil assembly.

[0068] Exemplarily, the switch device is a high-frequency power inverter switch device, such as an IGBT switch device or a MOS switch device.

[0069] Exemplarily, the N switch devices can be electrically connected to the coil assembly through a reactive power compensation resonance circuit, and a resonance capacitor is provided in the reactive power compensation resonance circuit. Optionally, the number of resonance capacitors can be the same as the number of switch devices. By the high-frequency switching action of the switch devices, oscillations are generated between the coil assembly and the resonance capacitor, and eddy currents can be generated in a metal cookware with high permeability, thereby realizing the heating of the cookware.

[0070] In the related art, traditional induction heating appliances are only applicable to metal cookware with high permeability, while for cookware with low permeability, such as some non-metal cookware, including ceramic cookware, casserole cookware, glass cookware, etc., they cannot be heated at all, resulting in poor versatility of induction heating appliances.

[0071] To solve the above problems, when the technical solution of the present application receives a cooking instruction, it first determines the permeability of the current cookware to be heated. Exemplarily, after the user places the cookware on the cooking appliance, the cooking appliance controls the coil to operate at a predetermined frequency and detects the temperature rise value of the cookware, and determines the cookware type and the permeability of the cookware according to the temperature rise value of the cookware.

[0072] Exemplarily, a cookware detection sensor is provided on the cooking appliance, and the cookware type and the permeability of the cookware are detected through the cookware detection sensor. Among them, exemplarily, the cookware detection sensor includes an infrared sensor, a magnetic detection sensor, a metal sensor, a microwave sensor, or an image sensor.

[0073] Exemplarily, a label for recording the type of cookware and the magnetic permeability of the cookware is provided on the cookware. Exemplarily, the label can be a Near Field Communication (NFC) label, a graphic code label, or a magnetic stripe label. An identification device for reading the label is provided on the cooking device, and the type of cookware and the magnetic permeability of the cookware are determined by reading the information in the label on the cookware.

[0074] Exemplarily, the cooking device can receive the type of cookware input by the user through a human-machine interaction interface. The cooking device determines the magnetic permeability of the cookware according to the type of cookware selected by the user and a comparison table of the type of cookware and the magnetic permeability stored in advance.

[0075] When the magnetic permeability of the cookware is relatively high, such as for traditional metal cookware used on induction cookers, the coil assembly can generate eddy currents on the cookware through resonance with the resonant capacitor. The eddy currents act on the resistance of the cookware itself, causing the cookware to generate heat by itself, thus realizing the heating of the cookware.

[0076] When the magnetic permeability of the cookware is relatively low, such as some metal cookware with low magnetic permeability or some non-metal cookware, eddy currents cannot be generated on the cookware through the resonance between the coil assembly and the resonant capacitor. For this situation, the resonant frequency between the coil assembly and the resonant capacitor can be increased to increase the coil impedance, so that the coil generates heat during high-frequency resonance, and the heat generated by the coil is used to heat the cookware.

[0077] Specifically, since the coil itself has a certain impedance, when a high-frequency resonant current passes through the coil, the coil itself will generate heat due to the action of its own impedance. When the coil assembly and the resonant capacitor resonate at a higher resonant frequency, the impedance value of the coil itself will increase significantly. After the impedance of the coil increases, the heat generated when the current passes through the coil will also increase accordingly. Therefore, the coil itself can generate sufficient heat, and this heat is transferred to the cookware of the cooking appliance, thereby realizing the heating of the cookware by the heat generated by the coil.

[0078] Since the switching frequency of the switching device itself is limited, the cost of a switching device capable of realizing ultra-high-frequency switching is often dozens of times that of an ordinary switching device. For this reason, the number of switching devices is increased in the embodiments of the present application, specifically, N mutually parallel switch components are provided. When the switching frequency of a single switching device cannot meet the requirement of heating the cookware by the heat generated by the coil, the parallel switching devices can be controlled to switch sequentially, so as to equivalently obtain a higher switching frequency without using an ultra-high-frequency switching device whose cost far exceeds that of an ordinary switching device.

[0079] The technical solution of the present application can select different heating methods according to the magnetic permeability of the cookware. When the magnetic permeability of the cookware is low, multiple parallel switch devices cooperate to obtain a higher oscillation frequency to increase the impedance of the coil itself, and the coil generates heat by increasing its own impedance, and the cookware is heated by the heat generated by the coil, so that the induction heating cooking appliance can heat non-metallic cookware under effective cost control, improving the versatility of the induction heating cooking appliance.

[0080] The third aspect of the present application provides a heating control device for a cooking device, including: a memory for storing programs or instructions; a processor for implementing the steps of the heating control method of the cooking device provided in any of the above technical solutions when executing the programs or instructions, and thus also including all its beneficial effects. To avoid repetition, it will not be elaborated here.

[0081] The fourth aspect of the present application provides a readable storage medium, on which programs or instructions are stored, and when the programs or instructions are executed by a processor, the steps of the heating control method of the cooking device provided in any of the above technical solutions are implemented, and thus also including all its beneficial effects. To avoid repetition, it will not be elaborated here.

[0082] The fifth aspect of the present application provides a cooking device, including the heating control device of the cooking device provided in any of the above technical solutions; and / or the readable storage medium provided in any of the above technical solutions, and thus also including all its beneficial effects. To avoid repetition, it will not be elaborated here.

[0083] In some technical solutions of the present application, optionally, the cooking device further includes: a driving circuit electrically connected to the heating control device and / or the readable storage medium; a switching circuit, the switching circuit includes N switch devices, the switching circuit is electrically connected to the driving circuit, and the driving circuit is used to drive the N switch devices to switch; a resonant circuit, the resonant circuit includes N resonant capacitors, the N resonant capacitors correspond to the N switch devices one by one, and the resonant circuit is electrically connected to the switching circuit; a coil assembly, the coil assembly is electrically connected to the resonant circuit.

[0084] In this technical solution, the cooking device includes a driving circuit, a switching circuit, a resonant circuit and a coil assembly. Among them, the driving circuit is electrically connected to the heating control device and is used to generate a driving signal for the switch device to drive the switch device to change its switching state by the driving signal. The switching circuit is electrically connected to the resonant circuit, the switching circuit includes N switch devices, and the driving circuit is specifically used to output N driving signals corresponding to the N switch devices, so as to drive the N switch devices to switch synchronously or alternately.

[0085] The resonant circuit includes N resonant capacitors, and the N resonant capacitors correspond one-to-one with N switching devices. When one or more of the N switching devices switch synchronously at a certain switching frequency, the resonant capacitors corresponding to the switched-on switching devices and the coil assembly generate resonance, thereby generating eddy currents in the cookware. When using a non-metallic cookware, the N switching devices are controlled to switch alternately. At this time, it is equivalent to performing N switches within one switching cycle. The coil assembly and the N resonant capacitors resonate once respectively, which is equivalent to performing N resonances, thereby increasing the resonant frequency, increasing the impedance of the coil assembly, causing the coil assembly to heat itself, and heating the cookware by the heat generated by the coil assembly.

[0086] The technical solution of this application can realize the heating of non-metallic cookware by an induction heating appliance, improving the versatility of the induction heating cooking equipment. Brief Description of the Drawings

[0087] The above and / or additional aspects and advantages of the present invention will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, in which:

[0088] Figure 1 The flowchart of the heating control method showing some embodiments of this application is shown;

[0089] Figure 2 The circuit topology diagram of the cooking equipment showing some embodiments of this application is shown;

[0090] Figure 3 The waveform comparison schematic diagram of the input voltage and the electrical signals related to the switching device when heating a metal cookware is shown;

[0091] Figure 4 The waveform comparison schematic diagram of the input voltage and the electrical signals related to the switching device when heating a non-metallic cookware is shown;

[0092] Figure 5 The structural block diagram of the heating control device showing some embodiments of this application is shown;

[0093] Figure 6 The structural block diagram of the heating control device showing some embodiments of this application is shown.

[0094] Reference Signs:

[0095] 200 Cooking equipment, 202 Low-voltage power supply, 204 Main control circuit, 206 Sampling feedback circuit, 208 Power inverter drive circuit, 210 Switching device, 212 Filter rectifier circuit, 214 Reactive power compensation resonant circuit, 216 Coil assembly. Detailed Description of the Embodiments

[0096] To better understand the above objects, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

[0097] In the following description, many specific details are set forth in order to fully understand the present invention. However, the present invention can also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited by the specific embodiments disclosed below.

[0098] Next, refer to Figures 1 to 6 Describe a heating control method, device, storage medium, and cooking device of a cooking device according to some embodiments of the present invention.

[0099] In some embodiments of the present invention, a heating control method of a cooking device is provided. The cooking device includes a coil assembly and N switch devices arranged in parallel. The N switch devices are all electrically connected to the coil assembly. The coil assembly is used to heat a cookware. N is a positive integer greater than or equal to 2. Figure 1 The flowchart of the heating control method of some embodiments of the present application is shown. As Figure 1 shown, the method includes:

[0100] Step 102, in response to a cooking instruction, obtain the magnetic permeability of the cookware. The cooking instruction indicates a target heating power.

[0101] Step 104, according to the magnetic permeability and the target heating power, control at least one of the N switch devices to work, so that an eddy current is formed in the cookware by the coil assembly, or the coil assembly generates heat and heats the cookware.

[0102] In this embodiment, the cooking device can be an induction heating electromagnetic cooker, a multi-head stove, a rice cooker, an electric pressure cooker, or other cooking devices. The cooking device includes a coil assembly and N switch devices arranged in parallel. The N switch devices are all electrically connected to the coil assembly. When any one of the N switch devices arranged in parallel is closed, the input current can be supplied to the coil assembly to charge the coil assembly.

[0103] Exemplarily, the switch device is a high-frequency power inverter switch device, such as an IGBT (Insulated Gate Bipolar Transistor) switch device or a MOS (Metal Oxide Semiconductor) switch device.

[0104] Exemplarily, N switching devices can be electrically connected to the coil assembly through a reactive power compensation resonant circuit. A resonant capacitor is provided in the reactive power compensation resonant circuit. Optionally, the number of resonant capacitors can be the same as the number of switching devices. Through the high-frequency switching operation of the switching devices, oscillations are generated between the coil assembly and the resonant capacitor, and eddy currents can be generated in a metal cookware with high magnetic permeability, thereby realizing the heating of the cookware.

[0105] In related technologies, traditional induction heating appliances are only applicable to metal cookware with high magnetic permeability. For cookware with relatively low magnetic permeability, such as some non-metal cookware, including ceramic cookware, casserole cookware, glass cookware, etc., they cannot be heated at all, resulting in poor versatility of induction heating appliances.

[0106] In response to the above problems, when receiving a cooking instruction, the embodiment of the present application first determines the magnetic permeability of the current cookware to be heated. Exemplarily, after the user places the cookware on the cooking device, the cooking device controls the coil to operate at a predetermined frequency and detects the temperature rise value of the cookware, and determines the cookware type and the magnetic permeability of the cookware according to the temperature rise value of the cookware.

[0107] Exemplarily, a cookware detection sensor is provided on the cooking device to detect the cookware type and the magnetic permeability of the cookware. Among them, exemplarily, the cookware detection sensor includes an infrared sensor, a magnetic detection sensor, a metal sensor, a microwave sensor or an image sensor.

[0108] Exemplarily, a label for recording the cookware type and the magnetic permeability of the cookware is provided on the cookware. Exemplarily, the label can be a Near Field Communication (NFC) label, a graphic code label or a magnetic stripe label. An identification device for reading the label is provided on the cooking device, and the cookware type and the magnetic permeability of the cookware are determined by reading the information in the label on the cookware.

[0109] Exemplarily, the cooking device can receive the cookware type input by the user through a human-machine interaction interface. The cooking device determines the magnetic permeability of the cookware according to the cookware type selected by the user and in combination with a comparison table of the cookware type and the magnetic permeability stored in advance.

[0110] Specifically, Figure 2 shows the circuit topology diagram of the cooking device according to some embodiments of the present application, as Figure 2 shown, the cooking device 200 includes a low-voltage power supply 202, a main control circuit 204, a sampling feedback circuit 206, a power inverter drive circuit 208, a switching device 210, a filter rectifier circuit 212, a reactive power compensation resonant circuit 214 and a coil assembly 216.

[0111] The low-voltage power supply 202 receives an externally input electrical signal and converts it into a low-voltage electrical signal capable of powering the main control circuit. The main control circuit 204 can generate corresponding drive signals according to the target heating power and cookware type set by the user, and drive the switching device 210 to perform switching actions through the drive signals. The sampling feedback circuit can collect parameters such as the voltage and current of the switching device 210 and the reactive compensation resonant circuit 214, and feedback them to the main control circuit 204 to achieve closed-loop control. The filter rectifier circuit 212 can filter and rectify the input current and transfer it to the reactive compensation resonant circuit 214 through the switching device. The reactive compensation resonant circuit 214 includes a resonant capacitor, and the resonant capacitor forms a resonant loop with the coil assembly 216.

[0112] When the magnetic permeability of the cookware is relatively high, such as for traditional metal cookware used in induction cookers, the coil assembly can generate eddy currents on the cookware through resonance with the resonant capacitor. The eddy currents act on the resistance of the cookware itself, causing the cookware to generate heat itself, thus realizing the heating of the cookware.

[0113] When the magnetic permeability of the cookware is relatively low, such as some metal cookware with low magnetic permeability or some non-metal cookware, it is impossible to generate eddy currents on the cookware through the resonance between the coil assembly and the resonant capacitor. For this situation, the coil impedance can be increased by increasing the resonance frequency between the coil assembly and the resonant capacitor, so that the coil generates heat during high-frequency resonance, and the heat generated by the coil is used to heat the cookware.

[0114] Specifically, since the coil itself has a certain impedance, when a high-frequency resonant current passes through the coil, the coil itself will generate heat due to the action of its own impedance. When the coil assembly and the resonant capacitor resonate at a higher resonance frequency, the impedance value of the coil itself will increase significantly. After the impedance of the coil increases, the heat generated when the current passes through the coil will also increase accordingly. Therefore, the coil itself can generate sufficient heat, and these heats are transferred to the cookware of the cooking appliance, thus realizing the heating of the cookware by the heat generated by the coil.

[0115] Since the switching frequency of the switching device itself is limited, and the cost of switching devices capable of achieving ultra-high frequencies is often dozens of times that of ordinary switching devices. For this reason, the number of switching devices is increased in the embodiments of the present application, specifically by setting N mutually parallel switching components. When the switching frequency of a single switching device cannot meet the requirement of heating the cookware by making the coil generate heat, the parallel switching devices can be controlled to switch in sequence, so as to equivalently obtain a higher switching frequency without using ultra-high frequency switching devices whose cost far exceeds that of ordinary switching devices.

[0116] The embodiments of the present application can select different heating methods according to the magnetic permeability of the cookware. When the magnetic permeability of the cookware is low, multiple parallel switch devices cooperate to obtain a higher oscillation frequency to increase the self-impedance of the coil. By increasing the self-impedance of the coil, the coil generates heat, and the heat generated by the coil is used to heat the cookware, enabling the induction heating cooking appliance to heat non-metallic cookware under effective cost control and improving the versatility of the induction heating cooking appliance.

[0117] In some embodiments of the present application, optionally, the step of controlling at least one of the N switch devices to operate according to the magnetic permeability and the target heating power so that an eddy current is formed in the cookware by the coil assembly, or the coil assembly generates heat and heats the cookware specifically includes:

[0118] In the case where the magnetic permeability is greater than or equal to the first magnetic permeability threshold, M of the N switch devices are controlled to synchronously switch at the first switching frequency according to the target heating power so that an eddy current is formed in the cookware by the coil assembly, where M is a positive integer less than or equal to N; or

[0119] In the case where the magnetic permeability is less than the first magnetic permeability threshold, the N switch devices are controlled to alternately switch at the second switching frequency according to the target heating power so that the coil assembly generates heat and heats the cookware.

[0120] In this embodiment, the first magnetic permeability threshold is the magnetic permeability threshold for whether induction heating can be used for the current cookware. When the magnetic permeability of the cookware is higher than or equal to the first magnetic permeability threshold, an eddy current can be generated on the cookware through the resonance between the coil assembly and the resonant capacitor, causing the cookware to generate heat by itself and realizing the heating of the cookware.

[0121] When the magnetic permeability of the cookware is lower than the first magnetic permeability threshold, an eddy current cannot be generated on the cookware through the resonance between the coil assembly and the resonant capacitor. At this time, the impedance of the coil assembly can be increased by increasing the resonance frequency between the coil assembly and the resonant capacitor, enabling the coil assembly to generate heat by itself to heat the cookware.

[0122] Specifically, when the magnetic permeability of the cookware is higher than the first magnetic permeability threshold, one of the N switch devices (i.e., M = 1) can be controlled to switch at a switching frequency matching the target heating power, or multiple of the N switch devices (i.e., M > 1) can be controlled to synchronously switch at the first switching frequency matching the target heating power. An eddy current is generated on the cookware through the oscillation between the coil and the resonant capacitor, causing the cookware to heat up.

[0123] Specifically, Figure 3 shows a waveform comparison schematic diagram of the input voltage and the electrical signal related to the switch device when heating a metal cookware, as Figure 3As shown, when the magnetic permeability of the cookware is higher than the first magnetic permeability threshold, it indicates that the coil assembly can generate eddy current on the cookware through resonance with the resonant capacitor. The eddy current acts on the resistance of the cookware itself, causing the cookware to generate heat by itself, thus realizing the heating of the cookware. At this time, just control the switching of the switching device according to the corresponding first switching frequency. The relationships between the driving voltage, high-voltage terminal voltage, and high-voltage terminal current of the switching device and the waveform of the mains electricity are as Figure 3 shown.

[0124] Exemplarily, the range of the first switching frequency is from 20 kHz to 50 kHz.

[0125] When the magnetic permeability of the cookware is lower than the first magnetic permeability threshold, control N switching devices to alternately switch according to the second switching frequency. For example, assuming N = 3, that is, when there are 3 switching devices, first control the first switching device to perform a switching action. After the first switching device performs a switching action, immediately let the second switching device perform a switching action. After the second switching device performs a switching action, immediately let the third switching device perform a switching action. At this time, a switching cycle is completed, and this cycle continues.

[0126] Since the N switching devices are connected in parallel, when one of the switching devices performs a switching action, it can cause the coil assembly and the resonant capacitor to generate resonance once. When the N switching devices alternately perform switching actions, the coil assembly and the resonant capacitor can generate resonance N times within a switching cycle. Therefore, without increasing the switching frequency of each switching device, the resonance frequency between the coil assembly and the resonant capacitor is increased, the impedance of the coil assembly is further improved, and the heat generation efficiency of the coil assembly is increased.

[0127] Specifically, Figure 4 shows a schematic diagram of the waveform comparison between the input voltage and the relevant electrical signals of the switching device when heating a non-metallic cookware. As Figure 4 shown, when the magnetic permeability of the cookware is lower than the first magnetic permeability threshold, it indicates that the coil assembly cannot generate eddy current on the cookware through resonance with the resonant capacitor. At this time, control the N switching devices to switch respectively, and the switching sequence is as Figure 4 shown. Different switching devices alternately switch according to different time sequences. Within one cycle of the input current, the N switching devices switch respectively once, thereby increasing the total resonance frequency to N times the second switching frequency, thereby increasing the impedance of the coil assembly and enabling the coil assembly to generate enough heat to heat the cookware. The relationships between the driving voltage, high-voltage terminal voltage, and high-voltage terminal current of the switching device and the waveform of the mains electricity are as Figure 4 shown.

[0128] Exemplarily, let N = 5, that is, the number of switching devices is 5. Then the range of the second switching frequency is 10 kHz to 100 kHz, and at this time, the equivalent switching frequency of N switching devices is 50 kHz to 500 kHz.

[0129] In the embodiment of the present application, by means of the alternating switching of N switching devices arranged in parallel, without increasing the switching frequency of a single switching device, the coil assembly and the resonant capacitor can resonate at a higher frequency, thereby causing the coil assembly to heat itself and realizing effective heating of cookware with low magnetic permeability.

[0130] In some embodiments of the present application, optionally, the second switching frequency includes a first sub-switching frequency and a second sub-switching frequency, and the first sub-switching frequency is less than the second sub-switching frequency; in the case where the magnetic permeability is less than the first magnetic permeability threshold, the step of controlling N switching devices to alternately switch at the second switching frequency according to the target heating power specifically includes:

[0131] In the case where the magnetic permeability is less than the first magnetic permeability threshold and greater than or equal to the second magnetic permeability threshold, controlling N switching devices to alternately switch at the first sub-switching frequency according to the target heating power; or in the case where the magnetic permeability is less than the second magnetic permeability threshold, controlling N switching devices to alternately switch at the second sub-switching frequency according to the target heating power.

[0132] In this embodiment, for cookware with a magnetic permeability lower than the first magnetic permeability threshold, it can be subdivided into cookware with a magnetic permeability lower than the first magnetic permeability but higher than the second magnetic permeability, and cookware with a magnetic permeability lower than the second magnetic permeability.

[0133] Among them, when the magnetic permeability of a cookware is lower than the first magnetic permeability but higher than the second magnetic permeability, such as some metal cookware with low magnetic permeability, N switching devices alternately switch at the first sub-switching frequency. At this time, the impedance of the coil assembly and the impedance of the cookware with low magnetic permeability are both increased. At this time, the coil assembly generates heat and the cookware itself also generates heat, that is, heating is carried out simultaneously through the heat of the coil and the heat of the cookware.

[0134] Exemplarily, let N = 5, that is, the number of switching devices is 5. Then the range of the first sub-switching frequency is 10 kHz to 200 kHz, and at this time, the equivalent switching frequency of N switching devices is 50 kHz to 100 kHz.

[0135] When the magnetic permeability of a cookware is lower than the second magnetic permeability, the cookware cannot generate heat by induction heating. For example, for some non-metal cookware, N switching devices alternately switch at the second sub-switching frequency with a higher switching frequency. At this time, the impedance value of the coil assembly is further increased to make the coil assembly generate heat, and heating is carried out through the heat of the coil.

[0136] Exemplarily, let N = 5, that is, the number of switching devices is 5. Then the range of the first sub-switching frequency is 20 kHz to 100 kHz. At this time, the equivalent switching frequency of N switching devices is 100 kHz to 500 kHz.

[0137] In the embodiment of the present application, when the cookware is a metal cookware with low magnetic permeability, hybrid induction heating and coil heating are combined to improve the heating efficiency of the low magnetic permeability cookware. When the cookware is a non-metal cookware, a higher oscillation frequency is obtained through the cooperation of multiple parallel switching devices to increase the self-impedance of the coil and the heat generation of the coil, so that the induction heating cooking device can effectively heat various types of cookware and improve the versatility of the induction heating cooking device.

[0138] In some embodiments of the present application, optionally, the heating control method further includes: acquiring the working condition data of the switching device; adjusting the switching frequency of the switching device and / or the duty cycle of the switching device according to the comparison result between the working condition data and the working condition threshold.

[0139] In this embodiment, in this embodiment, the working condition data of the switching device indicates whether there is a risk of damage to the switching device, and the working condition threshold is the threshold that can ensure the stable operation of the switching device. After controlling the switching device to switch and work at the corresponding switching frequency according to the cookware type and the target heating power, the cooking device continuously acquires the working condition data of the switching device and compares the acquired working condition data with the working condition threshold.

[0140] Optionally, the above working condition threshold is associated with the electrical parameters of the switching device and the target heating power.

[0141] When the working condition data of the switching device exceeds the working condition threshold, it indicates that the switching device is in an adverse working condition and there is a risk of damage. At this time, the working state of the switching device is adjusted to reduce the operating pressure of the switching device.

[0142] Exemplarily, when the working condition data of the switching device exceeds the working condition threshold, the switching frequency of the switching device is adjusted, specifically by increasing the switching frequency of the switching device, so as to reduce the power and the pressure on the switching device.

[0143] Exemplarily, when the working condition data of the switching device exceeds the working condition threshold, the duty cycle of the switching device is adjusted, specifically by reducing the duty cycle of the switching device, so as to reduce the power and the pressure on the switching device.

[0144] The embodiment of the present application dynamically adjusts the working parameters of the switching device according to the working condition data of the switching device, so that the switching device can maintain a relatively balanced working condition and improve the stability of the switching device.

[0145] In some embodiments of the present application, optionally, the operating condition data includes: voltage value, current value, and temperature value; the operating condition thresholds include: voltage threshold, current threshold, and temperature threshold.

[0146] In this embodiment, the operating condition data includes the voltage value, which is specifically the voltage value at the high-voltage end of the switching device. Correspondingly, the operating condition threshold includes the voltage threshold, which is the maximum voltage value that the high-voltage end of the switching device can withstand. When the voltage value at the high-voltage end of the switching device is greater than the voltage threshold, it indicates that the switching device has a risk of damage. At this time, parameters such as the switching frequency and duty cycle of the switching device are adjusted to reduce power consumption.

[0147] It can be understood that N switching devices are connected in parallel, so the voltage values at the high-voltage ends of the N switching devices are the same.

[0148] The operating condition data further includes the current value, which is specifically the current value at the high-voltage end of the switching device. Correspondingly, the operating condition threshold includes the current threshold, which is the maximum current value that the switching device can withstand. When the current value at the high-voltage end of any one of the switching devices is greater than the current threshold, it indicates that the switching device has a risk of damage. At this time, parameters such as the switching frequency and duty cycle of all the switching devices are adjusted to reduce power consumption.

[0149] The operating condition data further includes the temperature value, and the operating condition threshold includes the temperature threshold, which is the maximum temperature value that the switching device can withstand. When the temperature value of any one of the switching devices is greater than the temperature threshold, it indicates that the switching device has a risk of burning out. At this time, parameters such as the switching frequency and duty cycle of all the switching devices are adjusted to reduce power consumption.

[0150] By collecting the voltage value and current value at the high-voltage end of the switching device, and the temperature value of the switching device, and by judging whether the corresponding operating condition parameters exceed the corresponding thresholds, the embodiments of the present application dynamically adjust the operating parameters of the switching device, which can ensure the reliability of the switching device.

[0151] In some embodiments of the present application, optionally, the heating control method further includes: obtaining the heating power of the coil assembly; adjusting the switching frequency and / or the duty cycle of the switching device according to the comparison result between the heating power and the target heating power.

[0152] In this embodiment, after controlling the switching device to switch and operate at the corresponding switching frequency according to the cookware type and the target heating power, the cooking device continuously collects the actual heating power of the coil assembly and judges whether the actual heating power meets the target heating power set by the user.

[0153] Specifically, the factors affecting the heating power include the switching frequency of the switching device and the duty cycle of the switching device. Therefore, when the actual heating power of the coil assembly is less than the target heating power, the switching frequency of the switching device can be correspondingly reduced, or the duty cycle of the switching device can be increased, or the operations of reducing the switching frequency and increasing the duty cycle can be performed simultaneously, so as to increase the heating power of the coil assembly.

[0154] It can be understood that when the actual heating power of the coil assembly is greater than the target heating power, the switching frequency of the switching device can be correspondingly reduced, or the duty cycle of the switching device can be increased, or the operations of increasing the switching frequency and reducing the duty cycle can be performed simultaneously, so as to reduce the heating power of the coil assembly.

[0155] In the embodiment of the present application, by collecting the actual heating power of the coil assembly and based on the comparison result between the actual heating power and the target heating power set by the user, the operating parameters of the switching device are dynamically adjusted, so that the actual heating power can be maintained within the range matching the target heating power set by the user, ensuring the heating effect of the cooking device.

[0156] In some embodiments of the present application, optionally, the step of obtaining the magnetic permeability of the cookware specifically includes: determining the cookware type according to the cookware selection input; determining the magnetic permeability according to the cookware type.

[0157] In this embodiment, when the user uses the cooking device, the cookware selection input can be made through the human-computer interaction panel of the cooking device. Exemplarily, the cooking device presets multiple cookware types, such as stainless steel cookware, casserole, enamel cookware, aluminum cookware, etc.

[0158] The user selects the type of the currently used cookware, and the cooking device determines the magnetic permeability of the current cookware according to the mapping table of the preset cookware type and the cookware magnetic permeability.

[0159] In the embodiment of the present application, the magnetic permeability of the cookware is determined by the type of cookware selected by the user, without adding additional sensors, which is beneficial to controlling the cost of the cooking device.

[0160] In some embodiments of the present application, a frequency doubling circuit is adopted. When the switching frequency limit of high-frequency power inverter switching devices (such as IGBTs, MOSs, etc.) is satisfied, compared with the existing conventional induction heating system, it has a wider frequency adjustment range. It can enable metal cookware with high magnetic permeability to be heated by induction heating at a conventional frequency, such as a frequency of 20 kHz to 50 kHz; for metal cookware with low magnetic permeability, through a higher operating frequency, such as a frequency of 50 kHz to 100 kHz, the impedance of the cookware is increased, thereby increasing the heating power of the metal cookware with weak magnetic permeability; for non-metal cookware, through a higher frequency, such as a frequency of 100 kHz to 500 kHz, the impedance value of the coil is significantly increased, so that the coil generates heat by itself, and the heat of the coil disk is conducted to the cookware to achieve the effect of heating the cookware.

[0161] The specific implementation method of the solution is as follows:

[0162] 1. In the circuit topology of high-frequency inverter resonance, two or more high-frequency inverter power switching devices are connected in parallel.

[0163] 2. When the metal cookware is made of high magnetic permeability material, it is heated at a conventional operating frequency. At this time, at least one high-frequency power inverter switching device, or multiple high-frequency power inverter switching devices are turned on or off simultaneously in each resonance period.

[0164] 3. When the metal cookware is made of low magnetic permeability material, it needs to be heated at a higher operating frequency. At this time, in each resonance period, different high-frequency power inverter switching devices are turned on and off alternately, so as to increase the overall operating frequency, synchronously increase the impedance of the cookware, and realize the heating of the metal cookware made of low magnetic permeability material.

[0165] 4. When using non-metal cookware, it is necessary to further increase the operating frequency for heating. At this time, in each resonance period, different high-frequency power inverter switching devices are turned on and off alternately, and the operating frequency needs to be increased to at least more than 2 Ω for the real part impedance of the coil to ensure the effect of the coil generating heat by itself, so as to conduct the heat of the coil to the cookware and realize the effect of heating the cookware.

[0166] 5. In order to ensure operation in the inductive region, when increasing the frequency, it is necessary to switch to a capacitor with a smaller capacitance value.

[0167] 6. When high-frequency heating non-metal cookware, in order to output greater power, the inductor needs to store higher energy in a short time, so it is necessary to switch to a coil with a smaller inductance.

[0168] In the embodiments of the present application, when heating a metal cookware with high magnetic permeability, in order to ensure the heating energy efficiency, by adopting a working mode with a conventional resonance frequency, eddy currents are generated in the cookware, and the cookware generates heat by itself through the oscillation of the eddy currents, so as to heat the cookware and achieve the cooking effect. When heating a metal cookware with low magnetic permeability, through a frequency doubling circuit, the working frequency is increased, so that the impedance of the cookware is increased, thereby realizing the heating of the cookware and achieving the cooking effect. When heating a non-metal cookware, through the frequency doubling circuit, the working frequency is further increased, so that the real part impedance of the coil can be at least 2 Ω or more to ensure the effect of the coil generating heat by itself, and thus the heat of the coil is conducted to the cookware to achieve the effect of heating the cookware.

[0169] In some embodiments of the present application, a heating control device for a cooking device is provided. The cooking device includes a coil assembly and N switch devices arranged in parallel. The N switch devices are all electrically connected to the coil assembly. The coil assembly is used to heat the cookware, and N is a positive integer greater than or equal to 2. Figure 5 The structural block diagram of the heating control device according to some embodiments of the present application is shown, as Figure 5 shown, the heating control device 500 includes:

[0170] An acquisition module 502, configured to acquire the magnetic permeability of the cookware in response to a cooking instruction, where the cooking instruction indicates a target heating power; a control module 504, configured to control at least one of the N switch devices to work according to the magnetic permeability and the target heating power, so that an eddy current is formed in the cookware by the coil assembly, or the coil assembly generates heat and heats the cookware.

[0171] In this embodiment, the cooking device may be an induction heating electromagnetic cooker, a multi-head stove, a rice cooker, an electric pressure cooker and other cooking devices. The cooking device includes a coil assembly and N switch devices arranged in parallel. The N switch devices are all electrically connected to the coil assembly. When any one of the N switch devices arranged in parallel is closed, the input current can be supplied to the coil assembly to charge the coil assembly.

[0172] Exemplarily, the switch device is a high-frequency power inverter switch device, such as an IGBT switch device or a MOS switch device.

[0173] Exemplarily, the N switch devices may be electrically connected to the coil assembly through a reactive power compensation resonance circuit. A resonance capacitor is provided in the reactive power compensation resonance circuit. Optionally, the number of resonance capacitors may be the same as the number of switch devices. Through the high-frequency switching action of the switch devices, oscillations are generated between the coil assembly and the resonance capacitor, and eddy currents can be generated in a metal cookware with high magnetic permeability, thereby realizing the heating of the cookware.

[0174] In related technologies, traditional induction heating appliances are only applicable to metal cookware with high magnetic permeability. For cookware with relatively low magnetic permeability, such as some non-metal cookware, including ceramic cookware, casserole cookware, glass cookware, etc., they cannot be heated at all, resulting in poor versatility of induction heating appliances.

[0175] In view of the above problems, when receiving a cooking instruction, the embodiment of the present application first determines the magnetic permeability of the cookware to be heated currently. Exemplarily, after the user places the cookware on the cooking device, the cooking device controls the coil to work at a predetermined frequency, and detects the temperature rise value of the cookware, and determines the cookware type and the magnetic permeability of the cookware according to the temperature rise value of the cookware.

[0176] Exemplarily, a cookware detection sensor is provided on the cooking device, and the cookware type and the magnetic permeability of the cookware are detected through the cookware detection sensor. Among them, exemplarily, the cookware detection sensor includes an infrared sensor, a magnetic detection sensor, a metal sensor, a microwave sensor or an image sensor.

[0177] Exemplarily, a label for recording the cookware type and the magnetic permeability of the cookware is provided on the cookware. Exemplarily, the label can be a Near Field Communication (NFC) label, a graphic code label or a magnetic stripe label. An identification device for reading the label is provided on the cooking device, and the cookware type and the magnetic permeability of the cookware are determined by reading the information in the label on the cookware.

[0178] Exemplarily, the cooking device can receive the cookware type input by the user through a human-machine interaction interface, and the cooking device determines the magnetic permeability of the cookware according to the cookware type selected by the user and in combination with a comparison table of the cookware type and the magnetic permeability stored in advance.

[0179] When the magnetic permeability of the cookware is high, such as for the metal cookware used in traditional induction cookers, the coil assembly can generate eddy currents on the cookware through resonance with the resonant capacitor. The eddy currents act on the resistance of the cookware itself, causing the cookware to generate heat by itself, thereby realizing the heating of the cookware.

[0180] When the magnetic permeability of the cookware is low, such as some metal cookware with low magnetic permeability or some non-metal cookware, eddy currents cannot be generated on the cookware through the resonance between the coil assembly and the resonant capacitor. For this situation, the resonance frequency between the coil assembly and the resonant capacitor can be increased to increase the coil impedance, so that the coil generates heat during high-frequency resonance, and the cookware is heated by the heat generated by the coil.

[0181] Specifically, since the coil itself has a certain impedance, when a high-frequency resonant current passes through the coil, heat will be generated due to the action of its own impedance. When the coil assembly resonates with the resonant capacitor at a higher resonant frequency, the impedance value of the coil itself will increase significantly. After the impedance of the coil increases, the heat generated when the current passes through the coil will also increase accordingly. Therefore, sufficient heat can be generated in the coil itself, and this heat is transferred to the cookware of the cooking appliance, thereby realizing heating the cookware by the heat generated by the coil.

[0182] Since the switching frequency of the switching device itself is limited, the cost of a switching device capable of achieving ultra-high-frequency switching is often dozens of times that of an ordinary switching device. In this regard, the embodiment of the present application increases the number of switching devices, specifically by setting N switch components connected in parallel. When the switching frequency of a single switching device cannot meet the requirement of heating the cookware by making the coil generate heat, the parallel-connected switching devices can be controlled to switch sequentially, thereby equivalently obtaining a higher switching frequency without using an ultra-high-frequency switching device whose cost far exceeds that of an ordinary switching device.

[0183] The embodiment of the present application can select different heating methods according to the magnetic permeability of the cookware. When the magnetic permeability of the cookware is low, a higher oscillation frequency is obtained through the cooperation of multiple parallel-connected switching devices to increase the impedance of the coil itself. The coil is heated by increasing the impedance of the coil itself, and the cookware is heated by the heat generated by the coil, enabling the induction heating cooking appliance to heat non-metallic cookware under effective cost control and improving the versatility of the induction heating cooking appliance.

[0184] In some embodiments of the present application, optionally, the control module is further configured to:

[0185] In the case where the magnetic permeability is greater than or equal to the first magnetic permeability threshold, according to the target heating power, control M of the N switching devices to switch synchronously at the first switching frequency, so as to form an eddy current in the cookware by the coil assembly, where M is a positive integer less than or equal to N; or

[0186] In the case where the magnetic permeability is less than the first magnetic permeability threshold, according to the target heating power, control the N switching devices to switch alternately at the second switching frequency, so as to make the coil assembly generate heat and heat the cookware.

[0187] In this embodiment, the first magnetic permeability threshold is the magnetic permeability threshold for whether induction heating can be used for the current cookware. When the magnetic permeability of the cookware is higher than or equal to the first magnetic permeability threshold, an eddy current can be generated on the cookware through the resonance between the coil assembly and the resonant capacitor, causing the cookware itself to generate heat and realizing heating of the cookware.

[0188] When the magnetic permeability of the cookware is lower than the first magnetic permeability threshold, eddy current cannot be generated on the cookware through the resonance between the coil assembly and the resonant capacitor. At this time, the impedance of the coil assembly can be increased by increasing the resonance frequency between the coil assembly and the resonant capacitor, so that the coil assembly can generate heat by itself to heat the cookware.

[0189] Specifically, when the magnetic permeability of the cookware is higher than the first magnetic permeability threshold, one of the N switching devices (i.e., M = 1) can be controlled to switch at a switching frequency matching the target heating power, or multiple of the N switching devices (i.e., M>1) can be controlled to synchronously switch at a first switching frequency matching the target heating power, and eddy current is generated on the cookware through the oscillation between the coil and the resonant capacitor to heat the cookware.

[0190] Exemplarily, the range of the first switching frequency is 20 kHz to 50 kHz.

[0191] When the magnetic permeability of the cookware is lower than the first magnetic permeability threshold, the N switching devices are controlled to alternately switch at a second switching frequency. For example, assuming N = 3, that is, when there are 3 switching devices, first control the first switching device to perform a switching action. After the first switching device performs a switching action, immediately let the second switching device perform a switching action. After the second switching device performs a switching action, immediately let the third switching device perform a switching action. At this time, a switching cycle is completed, and this cycle is repeated.

[0192] Since the N switching devices are connected in parallel, when one of the switching devices performs a switching action, the coil assembly and the resonant capacitor can generate a resonance once. When the N switching devices alternately perform switching actions, the coil assembly and the resonant capacitor can generate N resonances within a switching cycle. Therefore, without increasing the switching frequency of each switching device, the resonance frequency between the coil assembly and the resonant capacitor is increased, so that the impedance of the coil assembly is further increased, and the heating efficiency of the coil assembly is improved.

[0193] Exemplarily, assuming N = 5, that is, the number of switching devices is 5, the range of the second switching frequency is 10 kHz to 100 kHz, and the equivalent switching frequency of the N switching devices is 50 kHz to 500 kHz at this time.

[0194] In the embodiment of the present application, by alternately switching the N switching devices connected in parallel, without increasing the switching frequency of a single switching device, the coil assembly and the resonant capacitor can resonate at a higher frequency, and then the coil assembly generates heat by itself, realizing effective heating of cookware with low magnetic permeability.

[0195] In some embodiments of the present application, optionally, the second switching frequency includes a first sub-switching frequency and a second sub-switching frequency, and the first sub-switching frequency is less than the second sub-switching frequency; the control module is further configured to:

[0196] When the permeability is less than the first permeability threshold and greater than or equal to the second permeability threshold, control the N switching devices to alternately switch at the first sub-switching frequency according to the target heating power; or when the permeability is less than the second permeability threshold, control the N switching devices to alternately switch at the second sub-switching frequency according to the target heating power.

[0197] In this embodiment, for cookware with a permeability lower than the first permeability threshold, it can be subdivided into cookware with a permeability lower than the first permeability but higher than the second permeability, and cookware with a permeability lower than the second permeability.

[0198] Among them, when the permeability of a cookware is lower than the first permeability but higher than the second permeability, such as some metal cookware with low permeability, the N switching devices alternately switch at the first sub-switching frequency. At this time, the impedance of the coil assembly and the impedance of the low-permeability metal cookware are both increased. At this time, the coil assembly generates heat, and the cookware itself also generates heat, that is, heating is performed by both the coil heat and the cookware heat.

[0199] Exemplarily, assuming N = 5, that is, the number of switching devices is 5, the range of the first sub-switching frequency is 10 kHz to 200 kHz, and at this time, the equivalent switching frequency of the N switching devices is 50 kHz to 100 kHz.

[0200] When the permeability of a cookware is lower than the second permeability, the cookware cannot generate heat by induction heating. For example, some non-metal cookware, the N switching devices alternately switch at the second sub-switching frequency with a higher switching frequency. At this time, the impedance value of the coil assembly is further increased to make the coil assembly generate heat, and heating is performed by the coil heat.

[0201] Exemplarily, assuming N = 5, that is, the number of switching devices is 5, the range of the first sub-switching frequency is 20 kHz to 100 kHz, and at this time, the equivalent switching frequency of the N switching devices is 100 kHz to 500 kHz.

[0202] In the embodiment of the present application, when the cookware is a metal cookware with low permeability, hybrid induction heating and coil heating are used, which can improve the heating efficiency of the low-permeability cookware. When the cookware is a non-metal cookware, a higher oscillation frequency is obtained through the cooperation of multiple parallel switching devices to increase the impedance of the coil itself and the heat generation of the coil, so that the induction heating cooking device can effectively heat various types of cookware and improve the versatility of the induction heating cooking device.

[0203] In some embodiments of the present application, optionally, the acquisition module is further configured to acquire the operating condition data of the switching device; the control module is further configured to adjust the switching frequency of the switching device and / or the duty cycle of the switching device according to the comparison result between the operating condition data and the operating condition threshold.

[0204] In this embodiment, in this embodiment, the operating condition data of the switching device indicates whether there is a risk of damage to the switching device, and the operating condition threshold is a threshold that can ensure the stable operation of the switching device. After controlling the switching device to switch and operate at the corresponding switching frequency according to the cookware type and the target heating power, the cooking device continuously acquires the operating condition data of the switching device and compares the acquired operating condition data with the operating condition threshold.

[0205] Optionally, the above-mentioned operating condition threshold is associated with the electrical parameters of the switching device and the target heating power.

[0206] When the operating condition data of the switching device exceeds the operating condition threshold, it indicates that the switching device is in an adverse operating condition and there is a risk of damage. At this time, the operating state of the switching device is adjusted to reduce the operating pressure of the switching device.

[0207] Exemplarily, when the operating condition data of the switching device exceeds the operating condition threshold, the switching frequency of the switching device is adjusted, specifically by increasing the switching frequency of the switching device, so as to reduce the power and the pressure of the switching device.

[0208] Exemplarily, when the operating condition data of the switching device exceeds the operating condition threshold, the duty cycle of the switching device is adjusted, specifically by reducing the duty cycle of the switching device, so as to reduce the power and the pressure of the switching device.

[0209] In the embodiments of the present application, by dynamically adjusting the operating parameters of the switching device according to the operating condition data of the switching device, the switching device can be maintained in a relatively balanced operating condition, thereby improving the stability of the switching device.

[0210] In some embodiments of the present application, optionally, the operating condition data includes: voltage value, current value, and temperature value; the operating condition threshold includes: voltage threshold, current threshold, and temperature threshold.

[0211] In this embodiment, the operating condition data includes a voltage value, which is specifically the voltage value at the high-voltage end of the switching device. Correspondingly, the operating condition threshold includes a voltage threshold, which is the maximum voltage value that the high-voltage end of the switching device can withstand. When the voltage value at the high-voltage end of the switching device is greater than the voltage threshold, it indicates that there is a risk of damage to the switching device. At this time, parameters such as the switching frequency and duty cycle of the switching device are adjusted to reduce power consumption.

[0212] It can be understood that N switching devices are connected in parallel, so the voltage values at the high-voltage ends of the N switching devices are the same.

[0213] The operating condition data further includes a current value, specifically the current value at the high-voltage end of the switching device. Correspondingly, the operating condition threshold includes a current threshold, which is the maximum current value that the switching device can withstand. When the current value at the high-voltage end of any one switching device is greater than the current threshold, it indicates that the switching device has a risk of damage. At this time, parameters such as the switching frequency and duty cycle of all switching devices are adjusted to reduce power consumption.

[0214] The operating condition data further includes a temperature value, and the operating condition threshold includes a temperature threshold, which is the maximum temperature value that the switching device can withstand. When the temperature value of any one switching device is greater than the temperature threshold, it indicates that the switching device has a risk of burning out. At this time, parameters such as the switching frequency and duty cycle of all switching devices are adjusted to reduce power consumption.

[0215] In the embodiment of the present application, by collecting the voltage value and current value at the high-voltage end of the switching device, as well as the temperature value of the switching device, and by determining whether the corresponding operating condition parameters exceed the corresponding thresholds, the operating parameters of the switching device are dynamically adjusted, which can ensure the reliability of the switching device.

[0216] In some embodiments of the present application, optionally, the acquisition module is further configured to acquire the heating power of the coil assembly; the control module is further configured to adjust the switching frequency of the switching device and / or the duty cycle of the switching device according to the comparison result between the heating power and the target heating power.

[0217] In this embodiment, after controlling the switching device to switch and work at the corresponding switching frequency according to the cookware type and the target heating power, the cooking device continuously acquires the actual heating power of the coil assembly and determines whether the actual heating power meets the target heating power set by the user.

[0218] Specifically, the factors affecting the heating power include the switching frequency of the switching device and the duty cycle of the switching device. Therefore, when the actual heating power of the coil assembly is less than the target heating power, the switching frequency of the switching device can be correspondingly reduced, or the duty cycle of the switching device can be increased, or the operations of reducing the switching frequency and increasing the duty cycle can be performed simultaneously, so as to increase the heating power of the coil assembly.

[0219] It can be understood that when the actual heating power of the coil assembly is greater than the target heating power, the switching frequency of the switching device can be correspondingly reduced, or the duty cycle of the switching device can be increased, or the operations of increasing the switching frequency and reducing the duty cycle can be performed simultaneously, so as to reduce the heating power of the coil assembly.

[0220] In the embodiments of the present application, by collecting the actual heating power of the coil assembly and based on the comparison result between the actual heating power and the target heating power set by the user, the operating parameters of the switching device are dynamically adjusted, so that the actual heating power can be maintained within a range matching the target heating power set by the user, ensuring the heating effect of the cooking device.

[0221] In some embodiments of the present application, optionally, the heating control device further includes: a determining module, configured to determine the type of cookware according to the cookware selection input; and determine the magnetic permeability according to the type of cookware.

[0222] In this embodiment, when the user uses the cooking device, the user can perform a cookware selection input through the human-computer interaction panel of the cooking device. Exemplarily, the cooking device presets multiple types of cookware, such as stainless steel cookware, casserole, enamel cookware, aluminum cookware, etc.

[0223] The user selects the type of cookware currently in use, and the cooking device determines the magnetic permeability of the current cookware according to the mapping table of the preset cookware type and the magnetic permeability of the cookware.

[0224] The embodiments of the present application determine the magnetic permeability of the cookware through the type of cookware selected by the user, without the need to add additional sensors, which is beneficial to controlling the cost of the cooking device.

[0225] In some embodiments of the present invention, there is provided a heating control device for a cooking device. Figure 6 The structural block diagram of the heating control device according to some embodiments of the present application is shown. As Figure 6 shown, the heating control device 600 includes: a memory 602, configured to store programs or instructions; a processor 604, configured to implement the steps of the heating control method for the cooking device provided in any of the above embodiments when executing the programs or instructions, and thus also includes all its beneficial effects. To avoid repetition, it will not be described in detail here.

[0226] In some embodiments of the present invention, there is provided a readable storage medium, on which programs or instructions are stored. When the programs or instructions are executed by a processor, the steps of the heating control method for the cooking device provided in any of the above embodiments are implemented, and thus also includes all its beneficial effects. To avoid repetition, it will not be described in detail here.

[0227] In some embodiments of the present invention, there is provided a cooking device, including the heating control device for the cooking device provided in any of the above embodiments; and / or the readable storage medium provided in any of the above embodiments, and thus also includes all its beneficial effects. To avoid repetition, it will not be described in detail here.

[0228] In some embodiments of the present application, optionally, the cooking device further includes: a driving circuit electrically connected to the heating control device and / or the readable storage medium; a switching circuit including N switching devices, the switching circuit being electrically connected to the driving circuit, and the driving circuit being configured to drive the N switching devices to switch; a resonant circuit including N resonant capacitors, the N resonant capacitors corresponding to the N switching devices one by one, the resonant circuit being electrically connected to the switching circuit; and a coil assembly electrically connected to the resonant circuit.

[0229] In this embodiment, the cooking device includes a driving circuit, a switching circuit, a resonant circuit, and a coil assembly. Among them, the driving circuit is electrically connected to the heating control device and is configured to generate a driving signal for the switching device and drive the switching device to change its switching state through the driving signal. The switching circuit is electrically connected to the resonant circuit. The switching circuit includes N switching devices, and the driving circuit is specifically configured to output N driving signals corresponding to the N switching devices, so as to drive the N switching devices to switch synchronously or alternately.

[0230] The resonant circuit includes N resonant capacitors, and the N resonant capacitors correspond to the N switching devices one by one. When one or more of the N switching devices switch synchronously at a certain switching frequency, the resonant capacitors corresponding to the synchronously switched switching devices and the coil assembly generate resonance, thereby generating eddy current in the cookware. When using a non-metallic cookware, the N switching devices are controlled to switch alternately. At this time, it is equivalent to performing N switches in one switching cycle. The coil assembly and the N resonant capacitors resonate respectively once, which is equivalent to performing N resonances, thereby increasing the resonant frequency, increasing the impedance of the coil assembly, causing the coil assembly to heat itself, and heating the cookware through the heat generated by the coil assembly.

[0231] The embodiments of the present application can achieve the heating of non-metallic cookware by an induction heating appliance, improving the versatility of the induction heating cooking device.

[0232] The method can be implemented in various different ways according to specific features and / or example applications. For example, these methods can be implemented by a combination of hardware, firmware, and / or software. For example, in a hardware implementation, the processor can be implemented in one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), controllers, microcontrollers, microprocessors, electronic devices, other device units for performing the above functions, and / or combinations thereof.

[0233] A computer-readable storage medium can be a tangible device that can retain and store instructions for use by an instruction execution device. A computer-readable storage medium can be an electronic storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any suitable combination of the foregoing devices, without limitation. A non-exhaustive list of more specific examples of computer-readable storage media includes: portable computer floppy disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), static random access memory (SRAM), portable compact disc read-only memory (CD-ROM), digital versatile disks (DVDs), memory cards, floppy disks, encoding mechanical devices (such as punched cards or grooves with raised structures having instructions recorded thereon), and any suitable combination of the foregoing devices. A computer-readable storage medium as used herein should not be construed to be a signal per se, such as a radio wave or other freely propagating electromagnetic wave, an electromagnetic wave propagating through a waveguide or other transmission medium, or an electrical signal transmitted through a wire, etc.

[0234] In the description of the present invention, the term "a plurality of" refers to two or more, unless otherwise clearly defined. The orientation or positional relationship indicated by terms such as "upper", "lower", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention; terms such as "connected", "mounted", "fixed", etc. should all be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0235] In the description of the present invention, the description of terms such as "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In the present invention, the schematic representations of the above terms do not necessarily refer to the same embodiment or instance. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0236] The foregoing is only the preferred embodiment of the present invention and is not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A heating control method for a cooking device, characterized in that, the cooking device includes a coil assembly and N switch devices connected in parallel, and the N switch devices are all electrically connected to the coil assembly, and the coil assembly is used to heat a cookware, N is a positive integer greater than or equal to 2, and the method includes: In response to a cooking instruction, obtain the magnetic permeability of the cookware, and the cooking instruction indicates a target heating power; According to the magnetic permeability and the target heating power, control at least one of the N switch devices to work, so that an eddy current is formed in the cookware by the coil assembly, or the coil assembly generates heat and heats the cookware.

2. The heating control method according to claim 1, characterized in that, the step of controlling at least one of the N switch devices to work according to the magnetic permeability and the target heating power, so that an eddy current is formed in the cookware by the coil assembly, or the coil assembly generates heat and heats the cookware specifically includes: When the magnetic permeability is greater than or equal to a first magnetic permeability threshold, control M of the N switch devices to synchronously switch at a first switching frequency according to the target heating power, so that an eddy current is formed in the cookware by the coil assembly, and M is a positive integer less than or equal to N; or When the magnetic permeability is less than the first magnetic permeability threshold, control the N switch devices to alternately switch at a second switching frequency according to the target heating power, so that the coil assembly generates heat and heats the cookware; wherein, the product of the second switching frequency and M is greater than the first switching frequency.

3. The heating control method according to claim 2, characterized in that, the second switching frequency includes a first sub-switching frequency and a second sub-switching frequency, and the first sub-switching frequency is less than the second sub-switching frequency; the step of controlling the N switch devices to alternately switch at the second switching frequency according to the target heating power when the magnetic permeability is less than the first magnetic permeability threshold specifically includes: When the magnetic permeability is less than the first magnetic permeability threshold and greater than or equal to a second magnetic permeability threshold, control the N switch devices to alternately switch at the first sub-switching frequency according to the target heating power; or When the magnetic permeability is less than the second magnetic permeability threshold, control the N switch devices to alternately switch at the second sub-switching frequency according to the target heating power.

4. The heating control method according to claim 1, characterized in that, further includes: Obtain the working condition data of the switch device; Adjust the switching frequency and / or the duty ratio of the switch device according to the comparison result between the working condition data and the working condition threshold.

5. The heating control method according to claim 4, characterized in that, the working condition data includes: voltage value, current value and temperature value; the working condition threshold includes: voltage threshold, current threshold and temperature threshold.

6. The heating control method according to any one of claims 1 to 5, characterized in that, further includes: Obtain the heating power of the coil assembly; Adjust the switching frequency and / or the duty cycle of the switching device according to the comparison result between the heating power and the target heating power.

7. The heating control method according to any one of claims 1 to 5, characterized in that the step of obtaining the magnetic permeability of the cookware specifically includes: Determine the cookware type according to the cookware selection input; Determine the magnetic permeability according to the cookware type.

8. A heating control device for a cooking appliance, characterized in that the cooking appliance includes a coil assembly and N switching devices connected in parallel, and all N switching devices are electrically connected to the coil assembly. The coil assembly is used to heat the cookware, N is a positive integer greater than or equal to 2, and the heating control device includes: An acquisition module, configured to obtain the magnetic permeability of the cookware in response to a cooking instruction, and the cooking instruction indicates a target heating power; A control module, configured to control at least one of the N switching devices to operate according to the magnetic permeability and the target heating power, so that an eddy current is formed in the cookware by the coil assembly, or the coil assembly generates heat and heats the cookware.

9. A heating control device for a cooking appliance, characterized in that it includes: A memory, configured to store programs or instructions; A processor, configured to implement the steps of the heating control method of the cooking appliance according to any one of claims 1 to 7 when executing the programs or instructions.

10. A readable storage medium, on which programs or instructions are stored, characterized in that the programs or instructions, when executed by a processor, implement the steps of the heating control method of the cooking appliance according to any one of claims 1 to 7.

11. A cooking appliance, characterized in that it includes: The heating control device according to claim 8 or 9; and / or The readable storage medium according to claim 10.

12. The cooking appliance according to claim 11, characterized in that it further includes: A drive circuit, electrically connected to the heating control device and / or the readable storage medium; A switching circuit, the switching circuit includes N switching devices, the switching circuit is electrically connected to the drive circuit, and the drive circuit is used to drive the N switching devices to switch; A resonant circuit, the resonant circuit includes N resonant capacitors, and the N resonant capacitors correspond to the N switching devices one by one, and the resonant circuit is electrically connected to the switching circuit; A coil assembly, the coil assembly is electrically connected to the resonant circuit.

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