CN214592051U

CN214592051U - Control circuit of electromagnetic cooking appliance and electromagnetic cooking appliance

Info

Publication number: CN214592051U
Application number: CN202120310567.4U
Authority: CN
Inventors: 朱泽春; 张龙
Original assignee: Hangzhou Joyoung Household Electrical Appliances Co Ltd
Current assignee: Hangzhou Joyoung Household Electrical Appliances Co Ltd
Priority date: 2021-02-03
Filing date: 2021-02-03
Publication date: 2021-11-02
Anticipated expiration: 2031-02-03

Abstract

The application discloses electromagnetic cooking utensil's control circuit and electromagnetic cooking utensil, control circuit includes rectifier module and the filtering resonance module that has IGBT, and rectifier module and filtering resonance module are connected, and rectifier module is used for converting external power supply's alternating current into direct current, and filtering resonance module is used for converting the pulsation direct current after the rectification into smooth direct current, and control circuit still includes: the radiation detection module is connected with the filtering resonance module and is used for detecting a voltage signal between an IGBT collector electrode and an IGBT emitter electrode and detecting the radiation value of the electromagnetic cooking appliance according to the voltage signal; the driving module is connected with the filtering resonance module and used for controlling the on and off of the IGBT; and the main control chip is respectively connected with the radiation detection module and the driving module so as to drive the driving module to generate a driving signal according to the obtained voltage signal, further control the IGBT and reduce the radiation value of the electromagnetic cooking appliance.

Description

Control circuit of electromagnetic cooking appliance and electromagnetic cooking appliance

Technical Field

The utility model belongs to the technical field of domestic appliance, especially, relate to an electromagnetism cooking utensil's control circuit and electromagnetism cooking utensil.

Background

Electromagnetic cooking utensil is because the mode through electromagnetic induction cooks food, and it is efficient to generate heat, and convenient to use safety, convenient to carry simultaneously easily uses, as long as there is the place of power all to use, compares with traditional firing equipment and has very big advantage, has been used by more and more people.

Specifically, because the high-frequency excitation coil inside the electromagnetic cooking utensil can generate an alternating magnetic field after being introduced with alternating current, when the metal cookware is placed on the surface of the electromagnetic cooking utensil, the surface of the cookware can cut the magnetic lines of force of the alternating magnetic field to generate a large amount of eddy currents at the bottom of the cookware, the eddy currents enable carriers at the bottom of the cookware to move irregularly at high speed, and the carriers collide with atoms and rub to generate heat energy, so that the purpose of heating food is achieved. In the actual use process, because a user usually needs to stir and fry the metal pot, move the pot and the like, the alternating magnetic field generated by the electromagnetic cooking appliance cannot be completely absorbed by the metal pot, so that part of the alternating magnetic field leaks outwards from the periphery of the metal pot, and finally, electromagnetic radiation is generated.

In order to solve the above problems, the prior art has a control circuit, which includes a control module, an IGBT, a resonance module, and a radiation detection module, which are connected to each other. The radiation detection module can receive electromagnetic radiation and convert the electromagnetic radiation into an electric signal; the control module is used for receiving the electric signal generated by the radiation detection module and sending the electric signal to the IGBT and the resonance module; the IGBT and the resonance module can adjust the working state according to the electric signal. Although the control circuit provided by the prior art can detect electromagnetic radiation to a certain extent, the detection result of the radiation detection module can be greatly influenced when a metal pot placed on an electromagnetic cooking appliance deviates. Moreover, the cost of the circuit structure is high, and the circuit structure is obviously difficult to popularize for electromagnetic cooking appliances with low cost.

It will thus be seen that the prior art is susceptible to further improvements and enhancements.

SUMMERY OF THE UTILITY MODEL

The utility model provides an electromagnetic cooking utensil's control circuit and electromagnetic cooking utensil to solve above-mentioned technical problem's at least one technical problem.

The utility model discloses the technical scheme who adopts does:

in a first aspect, the utility model provides a control circuit of electromagnetic cooking utensil, including rectifier module and the filter resonance module that has IGBT, rectifier module with the filter resonance module is connected, just rectifier module is used for converting external power supply's alternating current into the direct current, the filter resonance module is used for converting the pulsation direct current after the rectification into smooth direct current, control circuit still includes: the radiation detection module is connected with the filtering resonance module and is used for detecting a voltage signal between a collector and an emitter of the IGBT and detecting the radiation value of the electromagnetic cooking appliance according to the voltage signal; the driving module is connected with the filtering resonance module and used for controlling the on and off of the IGBT; the main control chip is respectively connected with the radiation detection module and the driving module so as to drive the driving module to generate a driving signal according to the obtained voltage signal, and further control the IGBT and reduce the radiation value of the electromagnetic cooking appliance.

As a preferred embodiment of the present invention, the radiation detection module includes a voltage dividing unit, a voltage comparator and a reference unit; one end of the voltage division unit is connected with a collector of the IGBT, and the other end of the voltage division unit is connected with a first input end of the voltage comparator; one end of the reference unit is connected with VCC of the radiation detection module, and the other end of the reference unit is connected with a second input end of the voltage comparator; the output end of the voltage comparator is connected with the main control chip to output the voltage signal.

As a preferred embodiment of the present invention, the voltage dividing unit includes a first voltage dividing resistor, a second voltage dividing resistor, and a third voltage dividing resistor connected in sequence, and a first capacitor connected in parallel with the third voltage dividing resistor.

As a preferred embodiment of the present invention, the reference unit includes a first resistor, a second capacitor, and a third capacitor; the first resistor and the second resistor are connected in series, and the second capacitor and the third capacitor are respectively connected in parallel to the second resistor.

As a preferred embodiment of the present invention, the voltage signal includes a high level, a low level, a rising edge switched from the low level to the high level, or a falling edge switched from the high level to the low level.

As a preferred embodiment of the present invention, when the voltage of the first input terminal is greater than the voltage of the second input terminal, the output terminal of the voltage comparator outputs a high level; when the voltage of the first input end is smaller than the voltage of the second input end, the output end of the voltage comparator outputs a low level; or when the voltage of the first input end is greater than the voltage of the second input end, the output end of the voltage comparator outputs a low level; when the voltage of the first input end is smaller than the voltage of the second input end, the output end of the voltage comparator outputs high level.

As a preferred embodiment of the present invention, the radiation detection module includes an AD sampling unit and a DA conversion unit; the input end of the AD sampling unit is connected with the collector electrode of the IGBT, the output end of the AD sampling unit is connected with the input end of the DA conversion unit, and the output end of the DA conversion unit is used for outputting the voltage signal.

In a second aspect, the utility model also provides an electromagnetic cooking utensil, including the organism that is used for bearing the pan with set up in the inside circuit board of organism, the circuit board is provided with as above control circuit, control circuit basis the position appearance control of pan electromagnetic cooking utensil work.

As a preferred embodiment of the present invention, the machine body is further provided with a heating device connected to the circuit board, and the circuit board can be according to the pose control of the pot to the on-time of the IGBT, so as to control the heating power of the heating device.

As a preferred embodiment of the present invention, the electromagnetic cooking device includes an electromagnetic oven, an electric cooker, an electric pressure cooker or a water boiler.

Since the technical scheme is used, the utility model discloses the beneficial effect who gains does:

1. the utility model provides an electromagnetic cooking utensil's control circuit at first detects IGBT's voltage signal through radiation detection module's setting to according to voltage signal detection electromagnetic cooking utensil radiation value's size, then main control chip can be according to switching on and reducing radiation value of voltage signal control IGBT. Specifically, when a metal pot placed in a heating region of the electromagnetic cooking appliance is deviated or a metal pot with a smaller volume is used for cooking, the inductance value of the metal pot coupled with an excitation coil in the electromagnetic cooking appliance is increased, so that the maximum voltage of the IGBT is higher than the voltage of the IGBT in normal operation, which indicates that the metal pot is not matched with the electromagnetic cooking appliance or deviates from the position of the coil, and the radiation leakage of the cooking appliance is increased. From this, just can detect the state of placing of metal pan according to the change of the voltage signal that radiation detection module detected, sensitivity is high, the testing result is more accurate to main control chip can come on and off of control IGBT according to the change of voltage signal, thereby realizes the regulation to electromagnetic cooking utensil heating power, and then helps reducing electromagnetic radiation's leakage. In addition, this application can also reduce the noise that produces in the electromagnetic cooking utensil course of working to a great extent through the control to IGBT, does benefit to user experience. Furthermore, the utility model provides a control circuit simple structure, be convenient for implement, do benefit to product cost's reduction.

2. As a preferred embodiment of the present invention, the radiation detection module includes a voltage division unit, a voltage comparator, and a reference unit. The voltage division unit can adjust the voltage passing through the radiation detection module, and the radiation detection module is prevented from being damaged by overlarge voltage; the arrangement of the reference unit can provide a relatively accurate reference voltage for the voltage comparator, so that the accuracy of voltage signal detection of the radiation detection module is improved; the voltage comparator can compare the voltage generated by the IGBT with the reference voltage, has a simple structure and high sensitivity, and can output a voltage signal in time, so that the response time of the electromagnetic cooking appliance can be greatly shortened, and the user experience is facilitated.

3. As a preferred embodiment of the present invention, the radiation detection module includes an AD sampling unit and a DA conversion unit. The AD sampling unit can sample the voltage signal of the IGBT at a high speed, so that the operation efficiency of the radiation detection module is improved; the DA conversion unit not only can output reference voltage, but also can be integrated with a voltage comparator inside, so that comparison of IGBT voltage signals is achieved. The arrangement mode has higher integration degree, and is beneficial to the miniaturization of the control circuit and the volume of the electromagnetic cooking utensil.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the application and not to limit the invention. In the drawings:

fig. 1 is a block diagram of a control circuit according to an embodiment of the present invention;

fig. 2 is a circuit structure diagram of a control circuit according to an embodiment of the present invention;

fig. 3 is a circuit structure diagram of a filtering resonance module according to an embodiment of the present invention;

fig. 4 is a circuit structure diagram of a radiation detection module according to an embodiment of the present invention;

fig. 5 is a waveform diagram of a voltage signal according to an embodiment of the present invention.

Wherein,

the device comprises a 100 rectification module, a 200 filtering resonance module, a 210 resonance unit, a 220 voltage stabilizing unit, 230 IGBTs, a 300 radiation detection module, a 310 voltage dividing unit, a 320 voltage comparator, a 330 reference unit, a 400 driving module and a 500 main control chip.

Detailed Description

In order to more clearly explain the overall concept of the present application, the following detailed description is given by way of example in conjunction with the accompanying drawings.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.

In addition, in the description of the present invention, it should be understood that the terms "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be taken as limiting the present invention.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; the connection can be mechanical connection, electrical connection or communication; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

As shown in fig. 1 and 2, the utility model provides a control circuit of electromagnetic cooking utensil, including rectifier module 100 and the filter resonance module 200 that has the IGBT, rectifier module 100 is connected with filter resonance module 200, and rectifier module 100 is used for converting external power supply's alternating current into the direct current, and filter resonance module 200 is used for converting the pulsation direct current after the rectification into smooth direct current. In addition, the control circuit further includes a radiation detection module 300, a driving module 400, and a main control chip 500.

The radiation detection module 300 is connected with the filtering resonance module 200 and is used for detecting a voltage signal between a collector and an emitter of the IGBT and detecting the radiation value of the electromagnetic cooking appliance according to the voltage signal; specifically, when the electromagnetic cooking appliance is normally operated, the voltage between the collector and the emitter of the IGBT is in a normal range; when electromagnetic radiation leakage occurs in the electromagnetic cooking appliance, the voltage between the collector and the emitter of the IGBT is higher than the voltage range in normal operation, and the radiation value of the electromagnetic cooking appliance can be determined according to the voltage.

In addition, the driving module 400 is connected with the filtering resonance module 200 for controlling the on and off of the IGBT; the main control chip 500 is respectively connected with the radiation detection module 300 and the driving module 400, so as to drive the driving module 400 to generate a driving signal according to the obtained voltage signal, further control the IGBT and reduce the radiation value generated by the electromagnetic cooking appliance.

It should be noted that the present embodiment is not limited to a specific type and structure of the rectifier module 100, and may be a full-wave rectifier module, a bridge rectifier module, or even a half-wave rectifier module if no power requirement is met. As to what type of rectifier module 100 should be selected, the design requirements, the use characteristics, the production cost, the stability, and the like of the product should be considered comprehensively.

Specifically, as shown with continued reference to fig. 2, the rectifier module 100 in the present embodiment may include, for example, a FUSE1, a voltage dependent resistor CNR1, a capacitor C1, and a diac DB 1. The voltage dependent resistor CNR1, the capacitor C1 and the bidirectional trigger diode DB1 are respectively connected in parallel between a live wire leading-out end and a zero wire leading-out end of an external power supply, and are connected in series with the FUSE FUSE1 after being connected in parallel.

In addition, as shown in fig. 3, the filtering resonant module 200 in the present embodiment may further include a resonant unit 210, a voltage stabilizing unit 220, an IGBT230, and a capacitor C3, which are connected in sequence. The capacitor C3 plays a role of filtering, the resonant unit 210 may include an inductor L1, a capacitor C2 and a resistor R1 connected in series, and the magnitude of the series resistor R1 in the series resonant unit 210 may not affect the natural frequency of the series resonant unit 210, but may control and adjust the magnitudes of the current and the voltage at the time of resonance. It should be understood that the circuit structure of the resonant unit 210 provided in the present embodiment is only one specific example, and does not constitute a limitation to the specific structure of the resonant unit 210, and the resonant unit 210 may be a parallel resonant circuit, a series-parallel resonant circuit, or the like, in addition to the series resonant circuit described above. Further, the voltage regulation unit 220 may be formed by, for example, a resistor R2 and a zener diode ZD1 connected in parallel, and the voltage regulation unit 220 may be configured to output a stable voltage for the IGBT230 to conduct, so as to improve the stability of the IGBT230 in the operation process.

It should be noted that, regarding the driving module 400, since it is used to drive the IGBT230 to enable its normal operation and protect it at the same time, and there are many different types of driving circuits in the prior art, the detailed structure of the driving module 400 will not be described in detail in this embodiment. Accordingly, the specific structure and type of the main control chip 500 are not limited in this embodiment, and the main control chip may be a single chip, or may be a CPU, an FPGA (Field Programmable Gate Array), a CPLD (Complex Programmable logic device), and the like.

The utility model provides an electromagnetic cooking utensil's control circuit, at first the voltage signal to IGBT230 is detected through setting up of radiation detection module 300 to according to the size of voltage signal detection electromagnetic cooking utensil radiation value, then main control chip 500 can reduce according to voltage signal control IGBT 230's on-time, thereby lowers power and reduces the radiation value. Specifically, when a metal pot placed in the heating area of the electromagnetic cooking appliance is deviated or a metal pot with a smaller volume is used for cooking, the inductance value of the metal pot coupled with the excitation coil in the electromagnetic cooking appliance is increased, so that the maximum voltage of the IGBT230 is higher than the voltage of the IGBT in normal operation, which indicates that the metal pot is not matched with the electromagnetic cooking appliance or deviates from the position of the coil, and the radiation leakage of the cooking appliance is increased. Therefore, the placing state of the metal cookware can be predicted according to the change of the voltage signal detected by the radiation detection module 300, the sensitivity is high, the detection result is more accurate, and the main control chip 500 can control the on-off of the IGBT230 according to the change of the voltage signal, so that the heating power of the electromagnetic cooking appliance can be adjusted, and the electromagnetic radiation leakage can be reduced. In addition, this application can also reduce the noise that produces in the electromagnetic cooking utensil course of working to a great extent through the control to IGBT, does benefit to user experience. Furthermore, the utility model provides a control circuit simple structure, be convenient for implement, do benefit to product cost's reduction.

As a preferred embodiment of the present invention, referring to fig. 4, the radiation detection module 300 may include, for example, a voltage dividing unit 310, a voltage comparator 320, and a reference unit 330. One end of the voltage dividing unit 310 is connected to the collector of the IGBT230, and the other end is connected to the first input end of the voltage comparator 320; one end of the reference unit 330 is connected to VCC of the radiation detection module 300, and the other end is connected to a second input end of the voltage comparator 320; the output end of the voltage comparator 320 is connected to the main control chip 500 to output the voltage signal.

The voltage dividing unit 310 can adjust the voltage passing through the radiation detection module 300, so as to prevent the radiation detection module 300 from being damaged by the excessive voltage; the reference unit 330 can provide a relatively precise reference voltage for the voltage comparator 320, so as to improve the accuracy of detecting the voltage signal of the radiation detection module 300; the voltage comparator 320 can compare the voltage generated by the IGBT230 with the reference voltage, has a simple structure and high sensitivity, and can output a voltage signal in time, thereby greatly shortening the response time of the electromagnetic cooking appliance and facilitating user experience.

Specifically, the voltage dividing unit 310 may include a first voltage dividing resistor R3, a second voltage dividing resistor R4, and a third voltage dividing resistor R5 connected in sequence, and a first capacitor C4 connected in parallel with the third voltage dividing resistor R5.

Further, the reference unit 330 may include a first resistor R6, a second resistor R7, a second capacitor C5, and a third capacitor C6. The first resistor R6 and the second resistor R7 are connected in series, and the second capacitor C5 and the third capacitor C6 are respectively connected in parallel to the second resistor R7.

As a preferred embodiment of the present invention, the voltage signal may include a high level, a low level, a rising edge switching from a low level to a high level, a falling edge switching from a high level to a low level, and the like, which is not limited herein.

When the voltage of the first input terminal of the voltage comparator 320 is greater than the voltage of the second input terminal thereof, the output terminal of the voltage comparator 320 outputs a high level; when the voltage of the first input terminal of the voltage comparator 320 is less than the voltage of the second input terminal thereof, the output terminal of the voltage comparator 320 outputs a low level; or when the voltage of the first input terminal of the voltage comparator 320 is greater than the voltage of the second input terminal thereof, the output terminal of the voltage comparator 320 outputs a low level; when the voltage of the first input terminal of the voltage comparator 320 is less than the voltage of the second input terminal thereof, the output terminal of the voltage comparator 320 outputs a high level. It should be noted that the present embodiment is not limited to the determination method of the voltage signal, but for the convenience of understanding, the present embodiment is described by taking the former determination method as an example.

Specifically, referring to fig. 5, where Uc is the small-signal voltage processed by the voltage dividing unit 310, Uol is the reference voltage, and the CE voltage signal is the voltage signal between the collector and the emitter of the IGBT 230. The voltage comparator 320 has a first input terminal for receiving the Uc voltage, a second input terminal for receiving the Uol voltage, and an output terminal for outputting the CE voltage signal.

When the electromagnetic cooking appliance works normally, the voltages of the first input end and the second input end of the voltage comparator 320 are not crossed, and the voltage signal output of the output end is high level; when the metal pot moves or uses a metal pot with a small size, the voltage of the first input terminal of the voltage comparator 320 is greater than the voltage of the second input terminal, and the voltage signal output of the output terminal is a low level.

Therefore, the using state of the metal cookware can be analyzed by recording the number of the voltage signals (such as high level or low level) in a period of time, so that the accurate control of the heating process of the electromagnetic cooking appliance is realized, and the radiation of the electromagnetic cooking appliance is reduced.

It should be noted that, since the user often needs operations such as lifting and moving the pot during the cooking process, and the duration of these operations is often very short (e.g. within 10 s), a preset value may be set to analyze the specific operation process of the user. For example, when the time for the metal cookware to shift the electromagnetic cooking appliance is less than a preset value, the normal cooking operation of the user can be considered, and at the moment, the heating power of the electromagnetic cooking appliance can be kept unchanged; when the time that the metal pan squints the electromagnetic cooking utensil is greater than the default, then can think that the metal pan squints seriously or used the less pan of volume, at this moment, the heating power of electromagnetic cooking utensil reduces, and then realizes reducing electromagnetic radiation's purpose.

In one embodiment, the radiation detection module 300 may include an AD sampling unit (not shown in the figure) and a DA conversion unit (not shown in the figure). The input end of the AD sampling unit is connected to the collector of the IGBT230, the output end of the AD sampling unit is connected to the input end of the DA converting unit, and the output end of the DA converting unit is used for outputting the voltage signal.

The AD sampling unit can perform high-speed sampling on the voltage signal of the IGBT230, thereby improving the operation efficiency of the radiation detection module 300; the DA conversion unit can not only output a reference voltage, but also integrate a voltage comparator 320 therein, thereby implementing comparison of the voltage signal of the IGBT 230. The arrangement mode has higher integration degree, and is beneficial to the miniaturization of the control circuit and the volume of the electromagnetic cooking utensil.

The utility model also provides an electromagnetic cooking utensil (not shown in the figure), including the organism that is used for bearing the pan with set up in the inside circuit board of organism, the circuit board is provided with as above control circuit, control circuit basis the position appearance control of pan the work of electromagnetic cooking utensil.

In a specific example, a heating device (not shown in the figure) connected to the circuit board is further disposed inside the machine body, and the circuit board can control the on-time of the IGBT230 according to the posture of the pot, so as to control the heating power and the heating duration of the heating device.

The utility model can be realized by adopting or using the prior art for reference in places which are not mentioned in the utility model.

The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments.

The above description is only an example of the present invention, and is not intended to limit the present invention. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.

Claims

1. The utility model provides an electromagnetic cooking utensil's control circuit, includes rectifier module and the filtering resonance module that has IGBT, rectifier module with the filtering resonance module is connected, just rectifier module is used for converting external power supply's alternating current into the direct current, filtering resonance module is used for converting the pulsation direct current after the rectification into smooth direct current, its characterized in that, control circuit still includes:

the radiation detection module is connected with the filtering resonance module and is used for detecting a voltage signal between a collector and an emitter of the IGBT and detecting the radiation value of the electromagnetic cooking appliance according to the voltage signal;

the driving module is connected with the filtering resonance module and used for controlling the on and off of the IGBT;

the main control chip is respectively connected with the radiation detection module and the driving module so as to drive the driving module to generate a driving signal according to the obtained voltage signal, and further control the IGBT and reduce the radiation value of the electromagnetic cooking appliance.

2. The control circuit of the electromagnetic cooking appliance according to claim 1, wherein the radiation detection module includes a voltage dividing unit, a voltage comparator, and a reference unit; wherein,

one end of the voltage division unit is connected with a collector electrode of the IGBT, and the other end of the voltage division unit is connected with a first input end of the voltage comparator;

one end of the reference unit is connected with VCC of the radiation detection module, and the other end of the reference unit is connected with a second input end of the voltage comparator;

the output end of the voltage comparator is connected with the main control chip to output the voltage signal.

3. The control circuit of the electromagnetic cooking appliance according to claim 2, wherein the voltage dividing unit includes a first voltage dividing resistor, a second voltage dividing resistor, and a third voltage dividing resistor connected in series, and a first capacitor connected in parallel with the third voltage dividing resistor.

4. The control circuit of the electromagnetic cooking appliance according to claim 2, wherein the reference unit includes a first resistor, a second capacitor, and a third capacitor; the first resistor and the second resistor are connected in series, and the second capacitor and the third capacitor are respectively connected in parallel to the second resistor.

5. The control circuit of the electromagnetic cooking appliance according to claim 2, wherein the voltage signal comprises a high level, a low level, a rising edge switching from a low level to a high level, or a falling edge switching from a high level to a low level.

6. The control circuit of an electromagnetic cooking appliance of claim 5,

when the voltage of the first input end is greater than the voltage of the second input end, the output end of the voltage comparator outputs a high level; when the voltage of the first input end is smaller than the voltage of the second input end, the output end of the voltage comparator outputs a low level; or

When the voltage of the first input end is greater than the voltage of the second input end, the output end of the voltage comparator outputs a low level; when the voltage of the first input end is smaller than the voltage of the second input end, the output end of the voltage comparator outputs high level.

7. The control circuit of the electromagnetic cooking appliance according to claim 1, wherein the radiation detection module includes an AD sampling unit and a DA conversion unit; wherein,

the input end of the AD sampling unit is connected with the collector electrode of the IGBT, the output end of the AD sampling unit is connected with the input end of the DA conversion unit, and the output end of the DA conversion unit is used for outputting the voltage signal.

8. An electromagnetic cooking appliance, characterized by comprising a machine body for bearing a pot and a circuit board arranged in the machine body, wherein the circuit board is provided with the control circuit as claimed in any one of claims 1 to 7, and the control circuit controls the electromagnetic cooking appliance to work according to the pose of the pot.

9. The electromagnetic cooking appliance according to claim 8, wherein a heating device connected to the circuit board is further disposed inside the body, and the circuit board can control the on-time of the IGBT according to the posture of the pot, so as to control the heating power of the heating device.

10. The electromagnetic cooking appliance of claim 9, wherein the electromagnetic cooking appliance comprises an induction cooker, an electric rice cooker, an electric pressure cooker, or a water boiler.