Electromagnetic heating circuit

Abstract

The utility model discloses an electromagnetic heating circuit. The electromagnetic heating circuit comprises: a control module for outputting an initial driving signal, a first enable signal and a second enable signal; a driving module for receiving the initial driving signal, the first enable signal and the second enable signal, and controlling a first output end or a second output end to output the initial driving signal according to the first enable signal or the second enable signal; a waveform adjustment module for adjusting the initial driving signal output by the first output end of the driving module and generating an adjusted driving signal, or adjusting the initial driving signal output by the second output end of the driving module and generating an adjusted driving signal; a first switch module and a second switch module for conducting according to the adjusted driving signal; a first heating module connected with the first switch module, a second heating module connected with the second switch module, and the first heating module and the second heating module for electromagnetic heating. The utility model improves the control effect of the electromagnetic heating circuit.

Description

Technical Field

[0001] This utility model relates to the field of electromagnetic heating technology, and in particular to an electromagnetic heating circuit. Background Technology

[0002] Electromagnetic heating circuits achieve electromagnetic heating by controlling the operation of heating modules. When an electromagnetic heating circuit has multiple heating modules, it becomes difficult to effectively control these modules. Furthermore, the strong electromagnetic fields generated by the heating modules during operation can cause significant electromagnetic interference to the circuit, thereby reducing its control effectiveness. Utility Model Content

[0003] This invention provides an electromagnetic heating circuit to solve the problem of poor control effect of electromagnetic heating circuits.

[0004] According to one aspect of the present invention, an electromagnetic heating circuit is provided, comprising:

[0005] The control module is used to output the initial drive signal, the first enable signal, and the second enable signal;

[0006] A drive module is connected to the control module. The drive module is used to receive the initial drive signal, the first enable signal and the second enable signal, and control the first output terminal or the second output terminal to output the initial drive signal according to the first enable signal or the second enable signal.

[0007] A waveform adjustment module, connected to the first and second output terminals of the drive module, is used to adjust the initial drive signal output from the first output terminal of the drive module and generate an adjustment drive signal; or to adjust the initial drive signal output from the second output terminal of the drive module and generate the adjustment drive signal; the rising and falling edges of the waveform of the adjustment drive signal are smoother than the rising and falling edges of the waveform of the initial drive signal.

[0008] The first switch module and the second switch module are connected to the waveform adjustment module and are used to be turned on according to the adjustment drive signal;

[0009] A first heating module and a second heating module, wherein the first heating module is connected to the first switch module and the second heating module is connected to the second switch module, and the first heating module and the second heating module are used for electromagnetic heating.

[0010] Optionally, the waveform adjustment module includes: a first waveform adjustment unit and / or a second waveform adjustment unit;

[0011] The first waveform adjustment unit is connected between the first output terminal of the drive module and the first switch module;

[0012] The second waveform adjustment unit is connected between the second output terminal of the drive module and the second switch module.

[0013] Optionally, the first waveform adjustment unit includes: a first resistor, a second resistor, a third resistor, a first diode, and a first Zener diode;

[0014] The first end of the first resistor is connected to the first output terminal of the drive module, and the second end of the first resistor is connected to the control terminal of the first switch module.

[0015] The second resistor and the first diode are connected in series between the first and second ends of the first resistor;

[0016] The third resistor and the first Zener diode are connected in parallel between the control terminal and the second terminal of the first switching module;

[0017] The second waveform adjustment unit includes: a fourth resistor, a fifth resistor, a sixth resistor, a second diode, and a second Zener diode;

[0018] The first end of the fourth resistor is connected to the second output end of the drive module, and the second end of the fourth resistor is connected to the control end of the second switch module.

[0019] The fifth resistor and the second diode are connected in series between the first and second ends of the fourth resistor;

[0020] The sixth resistor and the second Zener diode are connected in parallel between the control terminal and the second terminal of the second switching module.

[0021] Optionally, the first switching module includes: a first transistor, the third resistor being connected in parallel between the control terminal and the second terminal of the first transistor, and the first terminal of the first transistor being connected to the first heating module;

[0022] The second switching module includes: a second transistor, the sixth resistor being connected in parallel between the control terminal and the second terminal of the second transistor, and the first terminal of the second transistor being connected to the second heating module.

[0023] Optionally, the driving module includes: a driving chip;

[0024] The driver chip includes: a power interface, a ground interface, a first drive signal input interface, a second drive signal input interface, a first enable signal input interface, a second enable signal input interface, a first drive signal output interface, and a second drive signal output interface;

[0025] The power interface of the driver chip is connected to the power supply terminal through a seventh resistor. A first capacitor is connected in series between the power interface and the ground interface of the driver chip, and a second capacitor is connected in parallel with the first capacitor.

[0026] The first drive signal input interface, the second drive signal input interface, the first enable signal input interface, and the second enable signal input interface of the drive chip are all connected to the control module.

[0027] The first drive signal output interface and the second drive signal output interface of the driver chip are both connected to the waveform adjustment module.

[0028] Optionally, the control module includes: a control chip;

[0029] The control chip includes: a power interface, a drive signal output interface, a first enable signal output interface, and a second enable signal output interface;

[0030] The power interface of the control chip is connected to the power supply terminal. The drive signal output interface of the control chip is connected to the first drive signal input interface and the second drive signal input interface of the drive chip. The first enable signal output interface of the control chip is connected to the first enable signal input interface of the drive chip. The second enable signal output interface of the control chip is connected to the second enable signal input interface of the drive chip.

[0031] Optionally, the electromagnetic heating circuit further includes: an eighth resistor, a ninth resistor, and a tenth resistor;

[0032] The eighth resistor is connected between the first enable signal output interface of the control chip and the first enable signal input interface of the driver chip; the ninth resistor is connected between the second enable signal output interface of the control chip and the second enable signal input interface of the driver chip; and the tenth resistor is connected between the drive signal output interface of the control chip and the first drive signal input interface of the driver chip.

[0033] Optionally, the electromagnetic heating circuit further includes: a filtering module, a rectifier module, a filter capacitor, and a voltage surge protection module;

[0034] The input terminal of the filtering module is connected to the AC power supply terminal, and the output terminal of the filtering module is connected to the input terminal of the rectifier module. The first and second terminals of the filtering capacitor are connected in parallel between the first and second output terminals of the rectifier module. The input terminal of the voltage surge protection module is connected to the output terminal of the filtering module, and the output terminal of the voltage surge protection module is connected to the control module.

[0035] Optionally, the first heating module includes a first heating coil and a third capacitor; the second heating module includes a second heating coil and a fourth capacitor.

[0036] The first end of the first heating coil is connected to the first end of the first switching module, the first end of the second heating coil is connected to the first end of the second switching module, the second ends of both the first and second heating coils are connected to the first end of the filter capacitor, the third capacitor is connected in parallel with the first heating coil, and the fourth capacitor is connected in parallel with the second heating coil; the second ends of both the first and second switching modules are connected to the second end of the filter capacitor.

[0037] The first switch module is used to turn on or off the power supply circuit of the first heating coil, and the second switch module is used to turn on or off the power supply circuit of the second heating coil.

[0038] Optionally, the electromagnetic heating circuit further includes: a voltage detection module, a voltage sampling module, and a temperature sampling module;

[0039] The voltage detection module is connected between the filter module and the control module, and is used to detect the output voltage of the filter module.

[0040] The voltage sampling module is connected in parallel with the first heating coil, and is also connected in parallel with the second heating coil. The voltage sampling module is also connected to the control module; the voltage sampling module is used to sample the voltage of the first heating coil or the second heating coil.

[0041] The temperature sampling module is connected to the control module and is used to sample the heating temperature of the first heating coil or the second heating coil.

[0042] The technical solution provided by this utility model embodiment, by setting up a control module and a drive module, realizes output control of the initial drive signal output through the first or second output terminal of the drive module, thereby achieving independent control of the first and second heating modules. By setting up a waveform adjustment module to adjust the waveform, the speed of the rising and falling edges of the initial drive signal is reduced and an adjustment drive signal is generated, improving the anti-interference capability of the adjustment drive signal and making its control of the first or second switching module more reliable. This achieves effective control of the first and second heating modules and has a better control effect.

[0043] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of this utility model, nor is it intended to limit the scope of this utility model. Other features of this utility model will become readily apparent from the following description. Attached Figure Description

[0044] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0045] Figure 1 This is a schematic diagram of an electromagnetic heating circuit according to an embodiment of the present utility model;

[0046] Figure 2 This is a schematic diagram of another electromagnetic heating circuit provided according to an embodiment of the present utility model;

[0047] Figure 3 This is a schematic diagram of another electromagnetic heating circuit provided according to an embodiment of the present utility model;

[0048] Figure 4 This is a schematic diagram of another electromagnetic heating circuit provided according to an embodiment of the present utility model;

[0049] Figure 5 This is a schematic diagram of another electromagnetic heating circuit provided according to an embodiment of the present utility model. Detailed Implementation

[0050] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0051] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the utility model described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0052] This utility model embodiment provides an electromagnetic heating circuit. Figure 1 This is a schematic diagram of an electromagnetic heating circuit provided for an embodiment of the present invention. (Reference) Figure 1 The electromagnetic heating circuit includes: a control module 1, a drive module 2, a waveform adjustment module 3, a first switch module 4, a second switch module 5, a first heating module 6, and a second heating module 7. The control module 1 outputs an initial drive signal, a first enable signal, and a second enable signal. The drive module 2 is connected to the control module and receives the initial drive signal, the first enable signal, and the second enable signal. Based on the first or second enable signal, the drive module 2 controls the first or second output terminal to output the initial drive signal. The waveform adjustment module 3 is connected to the first and second output terminals of the drive module 2 and adjusts the initial drive signal output from the first output terminal of the drive module 2, generating an adjustment drive signal; or adjusts the initial drive signal output from the second output terminal of the drive module 2 and generates an adjustment drive signal. The rising and falling edges of the waveform of the adjustment drive signal are smoother than the rising and falling edges of the waveform of the initial drive signal. The first switch module 4 and the second switch module 5 are connected to the waveform adjustment module 3 and are activated based on the adjustment drive signal. The first heating module 6 is connected to the first switch module 4, and the second heating module 7 is connected to the second switch module 5. The first heating module 6 and the second heating module 7 are used for electromagnetic heating.

[0053] For example, the electromagnetic heating circuit can be installed in a device such as a rice cooker or an induction cooker, and electromagnetic heating is performed through the first heating module 6 or the second heating module 7. The first heating module 6 and the second heating module 7 can have different heating powers or be installed in different locations. Different heating needs can be met by switching the operation of the first heating module 6 or the second heating module 7.

[0054] When the first heating module 6 or the second heating module 7 needs to perform electromagnetic heating, the control module 1 outputs an initial drive signal, a first enable signal, and a second enable signal. The first enable signal can be used to control whether the first output terminal of the drive module 2 can output a signal, and the second enable signal can be used to control whether the second output terminal of the drive module 2 can output a signal.

[0055] For example, when the first heating module 6 needs to perform electromagnetic heating, the control module 1 outputs an initial drive signal, a low-level first enable signal, and a high-level second enable signal. The initial drive signal can be a pulse signal. The high-level second enable signal is used to shield the second output terminal of the drive module 2, preventing it from outputting a signal. The low-level first enable signal controls the first output terminal of the drive module 2 to output a signal. At this time, the initial drive signal output by the control module 1 passes through the drive module 2 and is output from its first output terminal.

[0056] Because the electromagnetic heating circuit has a strong electromagnetic field, electromagnetic interference may affect its normal operation. The waveform adjustment module 3 can adjust the waveform of the initial drive signal output from the first output terminal of the drive module 2, reducing the speed of the rising and falling edges of the initial drive signal, making the rising and falling edges of the waveform smoother. When the electromagnetic heating circuit is subjected to electromagnetic interference, the smoother adjustment drive signal generated by the waveform adjustment module 3 can reduce the impact of electromagnetic interference and prevent the first switch module 4 from malfunctioning at the rising or falling edge of the waveform. The first switch module 4 can be turned on according to the adjustment drive signal, and the first heating module 6 can perform electromagnetic heating.

[0057] When the second heating module 7 needs to perform electromagnetic heating, the control module 1 outputs an initial drive signal, a high-level first enable signal, and a low-level second enable signal. The high-level first enable signal is used to shield the first output terminal of the drive module 2, preventing it from outputting signals. The low-level second enable signal controls the second output terminal of the drive module 2 to output signals. At this time, the initial drive signal output by the control module 1 passes through the drive module 2 and is output from its second output terminal.

[0058] The waveform adjustment module 3 is used to adjust the waveform of the initial drive signal output from the second output terminal of the drive module 2. The second switch module 5 can be turned on according to the adjusted drive signal, and the second heating module 7 performs electromagnetic heating.

[0059] The technical solution provided by this utility model embodiment, by setting up a control module and a drive module, realizes output control of the initial drive signal output through the first or second output terminal of the drive module, thereby achieving independent control of the first and second heating modules. By setting up a waveform adjustment module to adjust the waveform, the speed of the rising and falling edges of the initial drive signal is reduced and an adjustment drive signal is generated, improving the anti-interference capability of the adjustment drive signal and making its control of the first or second switching module more reliable. This achieves effective control of the first and second heating modules and has a better control effect.

[0060] Figure 2 A schematic diagram of another electromagnetic heating circuit provided in an embodiment of this utility model. (Reference) Figure 2 Based on the above embodiments, optionally, the waveform adjustment module 3 includes: a first waveform adjustment unit 31 and / or a second waveform adjustment unit 32. The first waveform adjustment unit 31 is connected between the first output terminal of the drive module 2 and the first switch module 4. The second waveform adjustment unit 32 is connected between the second output terminal of the drive module 2 and the second switch module 5.

[0061] To prevent the initial drive signal from being affected by electromagnetic interference, which could lead to malfunction of the first switch module 4 or the second switch module 5, the rising and falling edges of the initial drive signal can be adjusted by setting the first waveform adjustment unit 31 and / or the second waveform adjustment unit 32. By reducing the speed of the rising and falling edges of the initial drive signal, the rising and falling edges of the waveform can be made smoother. When the first switch module 4 or the second switch module 5 receives the adjustment drive signal, it will not immediately perform a switching action at the rising or falling edge of the adjustment drive signal, thus preventing the first switch module 4 or the second switch module 5 from performing incorrect actions at the rising or falling edge of the adjustment drive signal due to electromagnetic interference, and reducing the probability of malfunction of the first switch module 4 or the second switch module 5.

[0062] Figure 3 A schematic diagram of another electromagnetic heating circuit provided as an embodiment of this utility model. (Reference) Figure 3Based on the above embodiments, optionally, the first waveform adjustment unit 31 includes: a first resistor R1, a second resistor R2, a third resistor R3, a first diode D1, and a first Zener diode ZD1. The first end of the first resistor R1 is connected to the first output terminal of the drive module 2, and the second end of the first resistor R1 is connected to the control terminal of the first switch module 4. The second resistor R2 and the first diode D1 are connected in series between the first and second ends of the first resistor R1; the third resistor R3 and the first Zener diode ZD1 are connected in parallel between the control terminal and the second terminal of the first switch module 4. The second waveform adjustment unit 32 includes: a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a second diode D2, and a second Zener diode ZD2. The first end of the fourth resistor R4 is connected to the second output terminal of the drive module 2, and the second end of the fourth resistor R4 is connected to the control terminal of the second switch module 5. The fifth resistor R5 and the second diode D2 are connected in series between the first and second ends of the fourth resistor R4. The sixth resistor R6 and the second Zener diode ZD2 are connected in parallel between the control terminal and the second terminal of the second switch module 5.

[0063] The first resistor R1 is used to adjust the initial drive signal input to the control terminal of the first switch module 4, and the fourth resistor R4 is used to adjust the initial drive signal input to the control terminal of the second switch module 5, thereby reducing the speed of the rising and falling edges of the initial drive signal. The third resistor R3 and the sixth resistor R6 are used to generate a bias voltage, thereby driving the first switch module 4 or the second switch module 5 to turn on or off. The first terminal of the first Zener diode ZD1 is connected to the control terminal of the first switch module 4 to limit the voltage at the control terminal of the first switch module 4, preventing the voltage value from being too high and damaging the first switch module 4. The first terminal of the second Zener diode ZD2 is connected to the control terminal of the second switch module 5 to limit the voltage at the control terminal of the second switch module 5, preventing the voltage value from being too high and damaging the second switch module 5. For example, the first Zener diode ZD1 and the second Zener diode ZD2 can regulate the voltage to 18V.

[0064] Continue to refer to Figure 3 Based on the above embodiments, optionally, the first switch module 4 includes: a first transistor Q1, a third resistor R3 connected in parallel between the control terminal and the second terminal of the first transistor Q1, and the first terminal of the first transistor Q1 is connected to the first heating module. The second switch module 5 includes: a second transistor Q2, a sixth resistor R6 connected in parallel between the control terminal and the second terminal of the second transistor Q2, and the first terminal of the second transistor Q2 is connected to the second heating module.

[0065] In this configuration, the control terminal of the first transistor Q1 is connected to the first output terminal of the drive module 2 via the first waveform adjustment unit 31, and the control terminal of the second transistor Q2 is connected to the second output terminal of the drive module 2 via the second waveform adjustment unit 32. The first transistor Q1 is turned on when the first waveform adjustment unit 31 receives an adjustment drive signal, and the second transistor Q2 is turned on when the second waveform adjustment unit 32 receives an adjustment drive signal. For example, the first transistor Q1 and the second transistor Q2 can be IGBTs (Insulated Gate Bipolar Transistors).

[0066] Figure 4 A schematic diagram of another electromagnetic heating circuit provided as an embodiment of this utility model. (Reference) Figure 4 Based on the above embodiments, optionally, the driving module includes a driving chip 21. The driving chip 21 includes: a power interface VDD, a ground interface GND, a first driving signal input interface INA, a second driving signal input interface INB, a first enable signal input interface ENA, a second enable signal input interface ENB, a first driving signal output interface OUTA, and a second driving signal output interface OUTB. The power interface VDD of the driving chip 21 is connected to the power supply terminal through a seventh resistor R7. A first capacitor C1 is connected in series between the power interface VDD and the ground interface GND of the driving chip 21, and a second capacitor C2 is connected in parallel with the first capacitor C1. The first driving signal input interface INA, the second driving signal input interface INB, the first enable signal input interface ENA, and the second enable signal input interface ENB of the driving chip 21 are all connected to the control module 1. The first driving signal output interface OUTA and the second driving signal output interface OUTB of the driving chip 21 are both connected to the waveform adjustment module 3.

[0067] The initial drive signal output by the control module can be transmitted to the driver chip 21 through the first drive signal input interface INA and the second drive signal input interface INB. For example, when the first enable signal input through the first enable signal input interface ENA is high, the first drive signal output interface OUTA does not output the initial drive signal; when the first enable signal input through the first enable signal input interface ENA is low, the first drive signal output interface OUTA outputs the initial drive signal. Similarly, when the second enable signal input through the second enable signal input interface ENB is high, the second drive signal output interface OUTB does not output the initial drive signal; when the second enable signal input through the second enable signal input interface ENB is low, the second drive signal output interface OUTB outputs the initial drive signal.

[0068] This utility model embodiment achieves output control of the first drive signal output interface and the second drive signal output interface by setting a driver chip. The initial drive signal can be output through the first drive signal output interface or the second drive signal output interface, thereby realizing the control of the first switch module and the second switch module. Moreover, the driver chip has a small size, stable control effect and high reliability.

[0069] Continue to refer to Figure 4 Based on the above embodiments, optionally, the control module includes a control chip 11. The control chip 11 includes a power interface VDD, a drive signal output interface PPG, a first enable signal output interface OPAN, and a second enable signal output interface OPAO. The power interface VDD of the control chip 11 is connected to a power supply terminal. The drive signal output interface PPG of the control chip 11 is connected to the first drive signal input interface INA and the second drive signal input interface INB of the drive chip 21. The first enable signal output interface OPAN of the control chip 11 is connected to the first enable signal input interface ENA of the drive chip 21. The second enable signal output interface OPAO of the control chip 11 is connected to the second enable signal input interface ENB of the drive chip 21.

[0070] Among them, the drive signal output interface PPG is used to output the initial drive signal, the first enable signal output interface OPAN is used to output the first enable signal, and the second enable signal output interface OPAO is used to output the second enable signal.

[0071] Continue to refer to Figure 4 Based on the above embodiments, the electromagnetic heating circuit may optionally further include: an eighth resistor R8, a ninth resistor R9, and a tenth resistor R10. The eighth resistor R8 is connected between the first enable signal output interface OPAN of the control chip 11 and the first enable signal input interface ENA of the driver chip 21; the ninth resistor R9 is connected between the second enable signal output interface OPAO of the control chip 11 and the second enable signal input interface ENB of the driver chip 21; and the tenth resistor R10 is connected between the drive signal output interface PPG of the control chip 11 and the first drive signal input interface INA of the driver chip 21.

[0072] Among them, the eighth resistor R8, the ninth resistor R9 and the tenth resistor R10 are used for current limiting to prevent the output signal of the control chip 11 from being damaged by the driver chip 21 due to high current.

[0073] Figure 5 A schematic diagram of another electromagnetic heating circuit provided as an embodiment of this utility model. (Reference) Figure 5Based on the above embodiments, optionally, the electromagnetic heating circuit further includes: a filter module 8, a rectifier module 9, a filter capacitor C5, and a voltage surge protection module 10. The input terminal of the filter module 8 is connected to the AC power supply terminal, and the output terminal of the filter module 8 is connected to the input terminal of the rectifier module 9. The first and second terminals of the filter capacitor C5 are connected in parallel between the first and second output terminals of the rectifier module 9. The input terminal of the voltage surge protection module 10 is connected to the output terminal of the filter module 8, and the output terminal of the voltage surge protection module 10 is connected to the control module 1.

[0074] The filter module 8 filters the AC power before inputting it into the rectifier module 9. For example, the filter module 8 can be an electromagnetic interference filter. The rectifier module 9 rectifies the AC power into DC power, and after further filtering by the filter capacitor C5, supplies power to the first heating module 6 or the second heating module 7, thereby improving the power supply stability to the first heating module 6 and the second heating module 7. The voltage surge protection module 10 suppresses drastic fluctuations in the output voltage or current of the filter module 8.

[0075] Continue to refer to Figure 5 Based on the above embodiments, optionally, the first heating module 6 includes a first heating coil 61 and a third capacitor C3; the second heating module 7 includes a second heating coil 71 and a fourth capacitor C4. The first end of the first heating coil 61 is connected to the first end of the first switching module 4, the first end of the second heating coil 71 is connected to the first end of the second switching module 5, the second ends of both the first heating coil 71 and the second heating coil 72 are connected to the first end of the filter capacitor C5, the third capacitor C3 is connected in parallel with the first heating coil 61, and the fourth capacitor C4 is connected in parallel with the second heating coil 71; the second ends of both the first switching module 4 and the second switching module 5 are connected to the second end of the filter capacitor C5. The first switching module 4 is used to turn on or off the power supply circuit of the first heating coil 61, and the second switching module 5 is used to turn on or off the power supply circuit of the second heating coil 71.

[0076] The first heating coil 61 and the third capacitor C3 can form a resonant circuit, and the second heating coil 71 and the fourth capacitor C4 can also form a resonant circuit. When the first switch module 4 is turned on, the output current of the first output terminal of the rectifier module 9 flows back to the second output terminal of the rectifier module 9 through the first heating coil 61 and the first switch module 4, thus forming a loop, and the first heating coil 61 starts heating. When the second switch module 5 is turned on, the output current of the first output terminal of the rectifier module 9 flows back to the second output terminal of the rectifier module 9 through the second heating coil 71 and the second switch module 5, thus forming a loop, and the second heating coil 71 starts heating.

[0077] Continue to refer to Figure 5Based on the above embodiments, the electromagnetic heating circuit may optionally further include: a voltage detection module 12, a voltage sampling module 13, and a temperature sampling module 14. The voltage detection module 12 is connected between the filter module 8 and the control module 1, and is used to detect the output voltage of the filter module 8. The voltage sampling module 13 is connected in parallel with the first heating coil 61, and also in parallel with the second heating coil 71. The voltage sampling module 13 is also connected to the control module 1; the voltage sampling module 13 is used to sample the voltage of the first heating coil 61 or the second heating coil 71. The temperature sampling module 14 is connected to the control module 1 and is used to sample the heating temperature of the first heating coil 61 or the second heating coil 71.

[0078] The voltage detection module 12 detects the output voltage of the filter module 8, and the voltage sampling module 13 samples the voltage of the first heating coil 61 or the second heating coil 71. The control module 1 adjusts the initial drive signal based on the sampled voltage from the voltage sampling module 13. The first switch module 4 or the second switch module 5 adjusts the switching frequency based on the adjustment drive signal generated by the different initial drive signals, thereby adjusting the voltage of the first heating coil 61 or the second heating coil 71. The temperature sampling module 14 samples the heating temperature of the first heating coil 61 or the second heating coil 71 and transmits it to the control module 1, thus enabling the detection of the heating temperature.

[0079] It should be understood that the various forms of the process shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this utility model can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this utility model can be achieved, and this is not limited herein.

[0080] The specific embodiments described above do not constitute a limitation on the scope of protection of this utility model. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. An electromagnetic heating circuit, characterized in that, include: The control module is used to output the initial drive signal, the first enable signal, and the second enable signal; A drive module is connected to the control module. The drive module is used to receive the initial drive signal, the first enable signal and the second enable signal, and control the first output terminal or the second output terminal to output the initial drive signal according to the first enable signal or the second enable signal. A waveform adjustment module is connected to the first and second output terminals of the drive module and is used to adjust the initial drive signal output by the first output terminal of the drive module and generate an adjustment drive signal. Alternatively, the initial drive signal output from the second output terminal of the drive module can be adjusted, and the adjusted drive signal can be generated. The rising and falling edges of the waveform of the adjustment drive signal are smoother than the rising and falling edges of the waveform of the initial drive signal. The first switch module and the second switch module are connected to the waveform adjustment module and are used to be turned on according to the adjustment drive signal; A first heating module and a second heating module, wherein the first heating module is connected to the first switch module and the second heating module is connected to the second switch module, and the first heating module and the second heating module are used for electromagnetic heating.

2. The electromagnetic heating circuit according to claim 1, characterized in that, The waveform adjustment module includes: a first waveform adjustment unit and / or a second waveform adjustment unit; The first waveform adjustment unit is connected between the first output terminal of the drive module and the first switch module; The second waveform adjustment unit is connected between the second output terminal of the drive module and the second switch module.

3. The electromagnetic heating circuit according to claim 2, characterized in that, The first waveform adjustment unit includes: a first resistor, a second resistor, a third resistor, a first diode, and a first Zener diode; The first end of the first resistor is connected to the first output terminal of the drive module, and the second end of the first resistor is connected to the control terminal of the first switch module. The second resistor and the first diode are connected in series between the first and second ends of the first resistor; The third resistor and the first Zener diode are connected in parallel between the control terminal and the second terminal of the first switching module; The second waveform adjustment unit includes: a fourth resistor, a fifth resistor, a sixth resistor, a second diode, and a second Zener diode; The first end of the fourth resistor is connected to the second output end of the drive module, and the second end of the fourth resistor is connected to the control end of the second switch module. The fifth resistor and the second diode are connected in series between the first and second ends of the fourth resistor; The sixth resistor and the second Zener diode are connected in parallel between the control terminal and the second terminal of the second switching module.

4. The electromagnetic heating circuit according to claim 3, characterized in that, The first switching module includes: a first transistor, the third resistor being connected in parallel between the control terminal and the second terminal of the first transistor, and the first terminal of the first transistor being connected to the first heating module; The second switching module includes: a second transistor, the sixth resistor being connected in parallel between the control terminal and the second terminal of the second transistor, and the first terminal of the second transistor being connected to the second heating module.

5. The electromagnetic heating circuit according to claim 1, characterized in that, The driving module includes: a driving chip; The driver chip includes: a power interface, a ground interface, a first drive signal input interface, a second drive signal input interface, a first enable signal input interface, a second enable signal input interface, a first drive signal output interface, and a second drive signal output interface; The power interface of the driver chip is connected to the power supply terminal through a seventh resistor. A first capacitor is connected in series between the power interface and the ground interface of the driver chip, and a second capacitor is connected in parallel with the first capacitor. The first drive signal input interface, the second drive signal input interface, the first enable signal input interface, and the second enable signal input interface of the driver chip are all connected to the control module. The first drive signal output interface and the second drive signal output interface of the driver chip are both connected to the waveform adjustment module.

6. The electromagnetic heating circuit according to claim 5, characterized in that, The control module includes: a control chip; The control chip includes: a power interface, a drive signal output interface, a first enable signal output interface, and a second enable signal output interface; The power interface of the control chip is connected to the power supply terminal. The drive signal output interface of the control chip is connected to the first drive signal input interface and the second drive signal input interface of the drive chip. The first enable signal output interface of the control chip is connected to the first enable signal input interface of the drive chip. The second enable signal output interface of the control chip is connected to the second enable signal input interface of the drive chip.

7. The electromagnetic heating circuit according to claim 6, characterized in that, The electromagnetic heating circuit further includes: an eighth resistor, a ninth resistor, and a tenth resistor; The eighth resistor is connected between the first enable signal output interface of the control chip and the first enable signal input interface of the driver chip; the ninth resistor is connected between the second enable signal output interface of the control chip and the second enable signal input interface of the driver chip; and the tenth resistor is connected between the drive signal output interface of the control chip and the first drive signal input interface of the driver chip.

8. The electromagnetic heating circuit according to claim 1, characterized in that, The electromagnetic heating circuit also includes: a filter module, a rectifier module, a filter capacitor, and a voltage surge protection module; The input terminal of the filtering module is connected to the AC power supply terminal, and the output terminal of the filtering module is connected to the input terminal of the rectifier module. The first and second terminals of the filtering capacitor are connected in parallel between the first and second output terminals of the rectifier module. The input terminal of the voltage surge protection module is connected to the output terminal of the filtering module, and the output terminal of the voltage surge protection module is connected to the control module.

9. The electromagnetic heating circuit according to claim 8, characterized in that, The first heating module includes: a first heating coil and a third capacitor; the second heating module includes: a second heating coil and a fourth capacitor; The first end of the first heating coil is connected to the first end of the first switching module, the first end of the second heating coil is connected to the first end of the second switching module, the second ends of both the first and second heating coils are connected to the first end of the filter capacitor, the third capacitor is connected in parallel with the first heating coil, and the fourth capacitor is connected in parallel with the second heating coil; the second ends of both the first and second switching modules are connected to the second end of the filter capacitor. The first switch module is used to turn on or off the power supply circuit of the first heating coil, and the second switch module is used to turn on or off the power supply circuit of the second heating coil.

10. The electromagnetic heating circuit according to claim 9, characterized in that, The electromagnetic heating circuit further includes: a voltage detection module, a voltage sampling module, and a temperature sampling module; The voltage detection module is connected between the filter module and the control module, and is used to detect the output voltage of the filter module. The voltage sampling module is connected in parallel with the first heating coil, and is also connected in parallel with the second heating coil. The voltage sampling module is also connected to the control module; the voltage sampling module is used to sample the voltage of the first heating coil or the second heating coil. The temperature sampling module is connected to the control module and is used to sample the heating temperature of the first heating coil or the second heating coil.

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