Electromagnetic heating control circuit, heating equipment and control method thereof, and storage medium

Abstract

The invention discloses an electromagnetic heating control circuit, heating equipment and a control method thereof, and a storage medium. The circuit comprises a power switch tube; a driving unit; the clamping unit is configured to clamp the driving voltage of the power switch tube; the zero-crossing detection unit is configured to detect a zero-crossing point of the input power supply so as to output a zero-crossing detection signal; and the control unit is configured to control the clamping unit to perform clamping work in response to the heating starting instruction, so that the driving unit drives the power switch tube based on the clamped driving voltage, and controls the clamping unit to stop clamping work under the condition that the arrival of a first zero crossing point after electromagnetic heating is determined based on the zero crossing detection signal. Therefore, the driving unit drives the power switch tube based on the driving voltage before clamping. According to the circuit, low-voltage driving of the power switch tube can be realized on the premise of ensuring normal operation of electromagnetic heating work, and starting current and noise are effectively reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of electromagnetic heating equipment, and in particular to an electromagnetic heating control circuit, an electromagnetic heating equipment and a control method thereof, and a computer-readable storage medium. Background Art

[0002] Electromagnetic heating devices, such as induction cookers, are kitchen appliances that heat food using the principle of electromagnetic induction. Related technologies achieve this by controlling an IGBT connected in series in a resonant heating circuit. However, when the electromagnetic heating device starts heating, the forced switching on of the IGBT generates a high current and switching noise, which can adversely affect the power grid and the electromagnetic heating device, and even pose a safety hazard. Summary of the Invention

[0003] The present invention aims to address, at least to a certain extent, one of the technical problems in the related art. To this end, a first object of the present invention is to provide an electromagnetic heating control circuit that achieves low-voltage drive for the power switch tube, effectively reducing startup current and noise. Furthermore, upon the first zero-crossing point after electromagnetic heating, the drive voltage is clamped, ensuring normal electromagnetic heating operation.

[0004] A second object of the present invention is to provide an electromagnetic heating device.

[0005] The third object of the present invention is to provide a control method for electromagnetic heating equipment.

[0006] A fourth object of the present invention is to provide a computer-readable storage medium.

[0007] A fifth object of the present invention is to provide an electromagnetic heating device.

[0008] To achieve the above-mentioned objectives, an embodiment of the first aspect of the present invention proposes an electromagnetic heating control circuit, comprising: a power switch tube; a driving unit, configured to drive the power switch tube to be turned on or off; a clamping unit, configured to clamp the driving voltage of the power switch tube; a zero-crossing detection unit, configured to detect the zero-crossing point of the input power supply to output a zero-crossing detection signal; a control unit, configured to control the clamping unit to perform clamping operation in response to a heating start instruction, so that the driving unit drives the power switch tube based on the clamped driving voltage, and when it is determined based on the zero-crossing detection signal that the first zero-crossing point after electromagnetic heating has arrived, the clamping unit is controlled to stop clamping operation, so that the driving unit drives the power switch tube based on the driving voltage before clamping, wherein the driving voltage before clamping is greater than the driving voltage after clamping.

[0009] According to an embodiment of the electromagnetic heating control circuit of the present invention, a driving unit drives a power switch tube to turn on or off, a clamping unit clamps the driving voltage of the power switch tube, and a zero-crossing detection unit detects the zero-crossing point of the input power supply to output a zero-crossing detection signal. In response to a heating start instruction, a control unit controls the clamping unit to perform a clamping operation so that the driving unit drives the power switch tube based on the clamped driving voltage. Upon determining, based on the zero-crossing detection signal, that the first zero-crossing point after electromagnetic heating has occurred, the control unit controls the clamping unit to stop clamping so that the driving unit drives the power switch tube based on the pre-clamping driving voltage, wherein the pre-clamping driving voltage is greater than the post-clamping driving voltage. Thus, when electromagnetic heating is started, the circuit clamps the driving voltage through the clamping unit to drive the power switch tube with the lower clamped driving voltage, thereby achieving low-voltage driving of the power switch tube and effectively reducing startup current and noise. Furthermore, upon the first zero-crossing point after electromagnetic heating, the clamping of the driving voltage is stopped, ensuring normal electromagnetic heating operation.

[0010] In addition, the electromagnetic heating control circuit according to the above embodiment of the present invention may also have the following additional technical features:

[0011] According to an embodiment of the present invention, the control unit is further configured to simultaneously output a driving control signal and an enable signal to the clamping unit, so that the clamping unit performs a clamping operation.

[0012] According to one embodiment of the present invention, the clamping unit includes: a clamping control sub-circuit, configured to generate a clamping control signal based on a driving control signal and an enable signal output by a control unit; and a clamping sub-circuit, configured to clamp the driving voltage of the power switch tube based on the clamping control signal to provide the clamped driving voltage to the driving unit.

[0013] According to one embodiment of the present invention, the clamp control subcircuit includes: a first transistor, the base of the first transistor is suitable for receiving an enable signal through a first resistor, and the emitter of the first transistor is connected to a reference ground; a second transistor, the base of the second transistor is suitable for receiving a drive control signal through a second resistor, the emitter of the second transistor is connected to the collector of the first transistor, and the collector of the second transistor is suitable for outputting a clamp control signal.

[0014] According to one embodiment of the present invention, the clamp control subcircuit includes: an AND gate, wherein the first input terminal of the AND gate is suitable for receiving an enable signal, and the second input terminal of the AND gate is suitable for receiving a drive control signal; a third transistor, wherein the base of the third transistor is connected to the output terminal of the AND gate, the emitter of the third transistor is connected to the reference ground, and the collector of the third transistor is suitable for outputting the clamp control signal.

[0015] According to one embodiment of the present invention, the clamping sub-circuit includes: a first voltage-stabilizing diode, the anode of the first voltage-stabilizing diode is suitable for receiving a clamping control signal; a fourth transistor, the base of the fourth transistor is connected to the cathode of the first voltage-stabilizing diode, the collector of the fourth transistor is suitable for receiving a driving voltage of the power switching tube, and the emitter of the fourth transistor is suitable for outputting the clamped driving voltage; and a third resistor, the third resistor is connected between the base and collector of the fourth transistor.

[0016] According to one embodiment of the present invention, the driving unit includes: a fifth transistor, wherein the base of the fifth transistor is suitable for receiving a driving control signal through a fourth resistor, the emitter of the fifth transistor is connected to a reference ground, and the collector of the fifth transistor is suitable for receiving a clamped driving voltage through a fifth resistor; a sixth transistor, wherein the base of the sixth transistor is suitable for being connected to the collector of the fifth transistor through a sixth resistor, the emitter of the sixth transistor is connected to the reference ground, and the collector of the sixth transistor is suitable for receiving a clamped driving voltage through a seventh resistor; a seventh transistor, wherein the base of the seventh transistor is connected to the collector of the sixth transistor, and the collector of the seventh transistor is suitable for receiving a clamped driving voltage through an eighth resistor; and an eighth transistor, wherein the base of the eighth transistor is connected to the base of the seventh transistor, the collector of the eighth transistor is connected to the reference ground, and the emitter of the eighth transistor is connected to the emitter of the seventh transistor, serving as an output end of the driving unit.

[0017] To achieve the above-mentioned purpose, a second embodiment of the present invention provides an electromagnetic heating device, comprising the above-mentioned electromagnetic heating control circuit.

[0018] According to the electromagnetic heating device of an embodiment of the present invention, based on the above-mentioned electromagnetic heating control circuit, low-voltage driving of the power switch tube can be achieved when electromagnetic heating is started, effectively reducing the starting current and noise, and stopping the clamping of the driving voltage when the first zero crossing point after electromagnetic heating arrives, thereby ensuring the normal operation of the electromagnetic heating device and the stability of the power grid.

[0019] To achieve the above-mentioned purpose, an embodiment of the third aspect of the present invention proposes a control method for an electromagnetic heating device, the electromagnetic heating device includes the above-mentioned electromagnetic heating control circuit, and the control method of the electromagnetic heating device includes: in response to a heating start instruction, controlling the clamping unit to perform clamping operation so that the driving unit drives the power switch tube based on the driving voltage after clamping; detecting the zero crossing point of the input power supply to obtain a zero crossing detection signal, and when it is determined based on the zero crossing detection signal that the first zero crossing point after electromagnetic heating has arrived, controlling the clamping unit to stop clamping operation so that the driving unit drives the power switch tube based on the driving voltage before clamping, wherein the driving voltage before clamping is greater than the driving voltage after clamping.

[0020] According to an embodiment of the present invention, a control method for electromagnetic heating equipment includes, first, in response to a heating start instruction, controlling a clamping unit to perform a clamping operation so that a driving unit drives a power switch tube based on a clamped driving voltage, detecting a zero-crossing point of an input power supply, and obtaining a zero-crossing detection signal. Furthermore, upon determining, based on the zero-crossing detection signal, that the first zero-crossing point after electromagnetic heating has arrived, controlling the clamping unit to stop the clamping operation so that the driving unit drives the power switch tube based on a pre-clamping driving voltage, wherein the pre-clamping driving voltage is greater than the post-clamping driving voltage. Thus, when electromagnetic heating is started, the method clamps the driving voltage via the clamping unit so that the power switch tube is driven by a lower clamped driving voltage, thereby achieving low-voltage driving of the power switch tube and effectively reducing startup current and noise. Furthermore, upon the arrival of the first zero-crossing point after electromagnetic heating, the clamping of the driving voltage is stopped, thereby ensuring the normal operation of the electromagnetic heating equipment and the stability of the power grid.

[0021] In addition, the control method of the electromagnetic heating device according to the above embodiment of the present invention may also have the following additional technical features:

[0022] According to one embodiment of the present invention, controlling the clamping unit to perform the clamping operation includes: simultaneously outputting a driving control signal and an enable signal to the clamping unit to enable the clamping unit to perform the clamping operation.

[0023] To achieve the above objectives, a fourth embodiment of the present invention provides a computer-readable storage medium having a computer program stored thereon, which implements the above-mentioned control method of the electromagnetic heating device when executed by a processor.

[0024] According to the computer-readable storage medium of an embodiment of the present invention, when the computer program stored thereon is executed by a processor, the control method of the above-mentioned electromagnetic heating equipment is implemented. Based on the control method of the electromagnetic heating equipment, low-voltage driving of the power switch tube can be achieved when electromagnetic heating is started, effectively reducing the starting current and noise, and stopping the clamping of the driving voltage when the first zero crossing point after electromagnetic heating arrives, thereby ensuring the normal operation of the electromagnetic heating equipment and the stability of the power grid.

[0025] To achieve the above-mentioned purpose, the fifth embodiment of the present invention proposes an electromagnetic heating device, including: a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the control method of the above-mentioned electromagnetic heating device is implemented.

[0026] According to the electromagnetic heating device of an embodiment of the present invention, when the processor executes the computer program, the control method of the electromagnetic heating device described above is implemented. Based on the control method of the electromagnetic heating device, low-voltage driving of the power switch tube can be achieved when electromagnetic heating is started, effectively reducing the starting current and noise, and stopping the clamping of the driving voltage when the first zero crossing point after electromagnetic heating arrives, thereby ensuring the normal operation of the electromagnetic heating device and the stability of the power grid.

[0027] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 Schematic diagram of the topology of the electromagnetic heating control circuit in the related art;

[0029] Figure 2 The operating current-voltage drop waveform of the power switch tube in the related art;

[0030] Figure 3 It is a waveform diagram of the electromagnetic heating control process in the related art;

[0031] Figure 4 is a connection diagram of an electromagnetic heating control circuit according to an embodiment of the present invention;

[0032] Figure 5 A topological diagram of an electromagnetic heating control circuit according to an embodiment of the present invention;

[0033] Figure 6 is a circuit diagram of a zero-crossing detection unit according to a specific embodiment of the present invention;

[0034] Figure 7 is a circuit diagram of an electromagnetic heating control circuit according to a specific embodiment of the present invention;

[0035] Figure 8 is a circuit diagram of a clamping unit according to another specific embodiment of the present invention;

[0036] Figure 9 is a waveform diagram of an electromagnetic heating control process according to an embodiment of the present invention;

[0037] Figure 10 is a block diagram of an electromagnetic heating device according to an embodiment of the present invention;

[0038] Figure 11 is a flow chart of a control method for an electromagnetic heating device according to an embodiment of the present invention;

[0039] Figure 12is a flow chart of a control method for an electromagnetic heating device according to one embodiment of the present invention;

[0040] Figure 13 FIG. 4 is a block diagram of an electromagnetic heating device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0041] The following describes embodiments of the present invention in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and are not to be construed as limiting the present invention.

[0042] The electromagnetic heating control circuit, electromagnetic heating device, control method of electromagnetic heating device and computer-readable storage medium proposed in the embodiments of the present invention are described below with reference to the accompanying drawings.

[0043] Taking electromagnetic heating equipment as an induction cooker as an example, in the related art, the electromagnetic heating control circuit is as follows Figure 1 As shown, the electromagnetic heating control circuit is connected to the mains via the live wire L and the neutral wire N. The AC signal of the mains is rectified into a DC signal output through the rectifier bridge 10, and the DC signal is filtered by the filter capacitor C1. When the signal port of the MUC (Microcontroller Unit) connected to the base (B pole) of the power switch tube 20 outputs a low-level shutdown signal, the electromagnetic heating device has no power output. When the signal port of the MCU connected to the base (B pole) of the power switch tube 20 outputs a control pulse, LC oscillation occurs on the resonant capacitor C2 and the coil L, thereby generating an alternating electromagnetic field to achieve electromagnetic heating.

[0044] In the related art, when the induction cooker is started up in the normal program, the MCU outputs a driving voltage of 18 to 20V to control the power switch tube 20. At this voltage, the power switch tube 20 operates in the linear region, which minimizes the saturation voltage drop of the power switch tube 20, reduces the loss under long-term full-load operation, and reduces the temperature rise. However, there is also a problem of large operating current, such as Figure 2 As shown, Ic is the operating current of the power switch tube 20, Vce is the voltage drop of the power switch tube 20, and Vg is the driving voltage of the power switch tube 20.

[0045] Taking the AC power of 220V as an example, the terminal voltage of the filter capacitor C1 after rectification, that is, the bus voltage, will reach 310V. Then, when the heating is turned on and the bus voltage reaches 310V, at the moment of power-on, the instantaneous current of the power switch tube 20 will be too large to reach more than 120A. Figure 3As shown, Vg is the driving voltage of the power switch tube 20, which is about 18V, Vc is the working oscillation voltage of the power switch tube 20, and Ix is the working current of the power switch tube 20. Figure 3 It can be seen that when the bus voltage is maintained at a high level, a relatively large operating current and switching noise will be generated at the moment of directly driving the power switch tube 20 .

[0046] In order to solve the above technical problems, the present application proposes an electromagnetic heating control circuit, which clamps the driving voltage through a clamping unit when the electromagnetic heating is started, so as to drive the power switch tube with a clamped driving voltage with a smaller voltage, thereby realizing low-voltage driving of the power switch tube, effectively reducing the starting current and noise, and stopping the clamping of the driving voltage when the first zero crossing point after electromagnetic heating arrives, thereby ensuring the normal operation of the electromagnetic heating.

[0047] The electromagnetic heating control circuit of the present application is described in detail below with reference to the accompanying drawings.

[0048] Figure 4 Schematic diagram of the connection of the electromagnetic heating control circuit according to an embodiment of the present invention.

[0049] like Figure 4 As shown, the electromagnetic heating control circuit 100 according to the embodiment of the present invention includes: a power switch tube 20 , a driving unit 30 , a clamping unit 40 , a zero-crossing detection unit 50 and a control unit 60 .

[0050] The driving unit 30 is configured to drive the power switch tube 20 to be turned on or off. The clamping unit 40 is configured to clamp the driving voltage of the power switch tube 20. The zero-crossing detection unit 50 is configured to detect the zero-crossing point of the input power supply to output a zero-crossing detection signal. The control unit 60 is configured to control the clamping unit 40 to perform a clamping operation in response to a heating start instruction, so that the driving unit 30 drives the power switch tube 20 based on the clamped driving voltage VOUT, and when it is determined based on the zero-crossing detection signal that the first zero-crossing point after electromagnetic heating has arrived, the clamping unit 40 is controlled to stop the clamping operation, so that the driving unit 30 drives the power switch tube 20 based on the pre-clamping driving voltage VCC, wherein the pre-clamping driving voltage VCC is greater than the post-clamping driving voltage VOUT.

[0051] Specifically, the power switch tube 20 can be selected according to actual conditions, for example, an IGBT (Insulated Gate Bipolar Transistor), a MOS (Metal-Oxide-Semiconductor Field-Effect Transistor), etc.

[0052] After receiving the heating start instruction, the control unit 60 controls the clamping unit 40 to start operating, clamping the driving voltage of the power switch tube 20. The clamped driving voltage VOUT is used as the driving voltage of the power switch tube 20 with a smaller voltage value. Assuming that the driving voltage VCC before clamping is 18V, the driving voltage VOUT after clamping is 8-11V. Therefore, when the heating is started, the control unit 60 reduces the driving voltage VCC before clamping, i.e., 18V, to 8-11V, achieving the purpose of turning on the power switch tube 20 with a low driving voltage, thereby gradually generating and changing the electromagnetic field and reducing noise caused by sudden electromagnetic field changes. At the same time, the zero-crossing detection unit 50 detects the zero-crossing point of the input power supply, i.e., the mains power, and outputs a zero-crossing detection signal. When the control unit 60 receives the first zero-crossing point after electromagnetic heating, it turns off the clamping operation of the clamping unit 40 and drives the power switch tube 20 with the driving voltage VC before clamping, i.e., 18V voltage, to avoid the risk of a large saturation voltage drop and temperature rise of the power switch tube 20 caused by long-term low-voltage driving, thereby ensuring the normal operation of the electromagnetic heating.

[0053] Combine Figure 5 As shown, one end of the zero-crossing detection unit 50 is connected to the mains input end to perform zero-crossing detection on the mains input for electromagnetic heating, and send the zero-crossing detection signal to the control unit 60. The control unit 60 outputs a driving pulse to the driving unit 30 upon receiving the heating start instruction, and at the same time controls the clamping unit 40 to start clamping operation, clamping the driving voltage VCC before clamping to a smaller driving voltage VOUT after clamping. The driving unit 30 drives the power switch tube 20 with the driving voltage VOUT after clamping according to the received control pulse signal, and starts electromagnetic heating, thereby realizing low-voltage conduction drive and reducing operating current and noise.

[0054] At the same time, after electromagnetic heating, the control unit 60 determines and counts the zero crossing point of the AC mains signal based on the received zero crossing detection signal. When the first zero crossing point after the start of electromagnetic heating is determined, the control unit 60 continues to output the drive pulse and controls the clamping unit 40 to stop clamping. The drive unit 30 then controls the power switch tube 20 to turn on and off based on the drive pulse with the drive voltage VCC before clamping, that is, to continue electromagnetic heating at a high voltage, ensuring the stable operation of the electromagnetic heating until the end of electromagnetic heating. It should be noted that for the convenience of circuit diagram, Figure 5 The driving unit 30 is omitted.

[0055] The electromagnetic heating control circuit of this embodiment can effectively reduce the starting current when the electromagnetic heating is started. At the same time, at the first zero crossing point after electromagnetic heating, it continues to drive the power switch tube 20 with a higher driving voltage VCC so that it does not affect the heating effect of the electromagnetic heating and ensures the normal operation of the electromagnetic heating.

[0056] In addition, the judgment conditions for whether electromagnetic heating has started can be set according to actual conditions. For example, electromagnetic heating is considered to have started when the control unit 60 outputs a driving pulse, and the control unit 60 uses the first zero crossing point after outputting the driving pulse as the first zero crossing point after electromagnetic heating.

[0057] In one embodiment of the present invention, the control unit 60 is further configured to simultaneously output the driving control signal VB and the enable signal V2 to the clamping unit 40 , so that the clamping unit 40 performs a clamping operation.

[0058] Specifically, the drive control signal VB is a drive pulse output to the drive unit 30. The drive unit 30 controls the on / off switching of the power switch 20 based on the drive pulse to perform electromagnetic heating. The enable signal V2 is a control signal generated based on the zero-crossing detection signal output by the zero-crossing detection unit 50. For example, before the first zero-crossing point after electromagnetic heating, the enable signal V2 output by the control unit 60 is a high-level signal. After the first zero-crossing point after electromagnetic heating, the enable signal V2 output by the control unit 60 is a low-level signal.

[0059] During operation, the drive control signal VB is output to the drive unit 30 to control the power switch tube 20 to be turned on or off through the drive unit 30; on the other hand, it is combined with the enable signal V2 and output to the clamping unit 40 to control the working state of the clamping unit 40, so that the clamping operation and the driving operation are carried out synchronously.

[0060] It should be noted that the zero-crossing detection unit 50 can select a circuit according to actual conditions, for example, Figure 6 The circuit structure shown in Figure 1 is as follows. Figure 6For example, the zero-crossing detection unit 50 collects the mains signal and outputs a corresponding zero-crossing detection signal, i.e., a voltage value. When the voltage of the zero-crossing detection signal is lower than 5.7V, it is determined that the mains signal has crossed zero. The control unit 60 compares the voltage of the zero-crossing detection signal with the preset voltage 5.7V through the comparator 61 to determine the zero-crossing point, and counts the zero-crossing points through the counter 62 after the electromagnetic heating starts, so as to output a high-low switching level signal, i.e., an enable signal V2. For example, in the initial state, the counter 62 outputs a high-level enable signal V2. When the control unit 60 receives the first zero-crossing point after the start heating instruction, it is considered that the electromagnetic heating has started, and the control counter 62 starts counting. When the second zero point is detected, i.e., a complete heating envelope, the low-level enable signal V2 is triggered to output, thereby controlling the clamping unit 40 to stop working. It is understandable that the start time of the above-mentioned counter 62 can be set according to actual conditions and is not limited here.

[0061] Further integration Figure 7 and Figure 8 As shown, in one embodiment of the present invention, the clamping unit 40 includes: a clamping control sub-circuit 41, configured to generate a clamping control signal V0 based on the driving control signal VB and the enable signal V2 output by the control unit 60; a clamping sub-circuit 42, configured to clamp the driving voltage of the power switch tube 20 based on the clamping control signal V0 to provide the clamped driving voltage VOUT to the driving unit 30.

[0062] Specifically, during the electromagnetic heating process, the drive control signal VB output by the control unit 60 is a pulse signal. Before and after the first zero-crossing point after electromagnetic heating, the control unit 60 outputs different enable signals V2 to control the operating state of the clamping unit 40. The operating state of the clamping unit 40 is described below using the example of the case where the enable signal V2 output by the control unit 60 is high before the first zero-crossing point after electromagnetic heating, and the case where the enable signal V2 output by the control unit 60 is low after the first zero-crossing point after electromagnetic heating.

[0063] At the start of electromagnetic heating, the clamping control sub-circuit 41 generates a clamping control signal V0 based on the drive control signal VB and the low-level enable signal V2, thereby controlling the clamping sub-circuit 42, causing the clamping sub-circuit 42 to step down and clamp the pre-clamping drive voltage VCC and output the post-clamping drive voltage VOUT to drive the power switch 20. When the first zero-crossing point after electromagnetic heating arrives, the enable signal V2 switches to a low level, and the clamping control sub-circuit 41 no longer outputs the clamping control signal V0, causing the clamping sub-circuit 42 to stop clamping and directly drive the power switch 20 using the pre-clamping drive voltage VCC.

[0064] It is understood that the clamping sub-circuit 42 is used to reduce the pre-clamping driving voltage VCC to achieve low-voltage driving of the power switch 20 at the start of electromagnetic heating, thereby reducing operating current and noise. The pre-clamping driving voltage VCC can be provided by the power supply unit 70, which is not limited here.

[0065] In one embodiment of the present invention, the clamp control subcircuit 41 includes: a first transistor Q1, the base of the first transistor Q1 is suitable for receiving the enable signal V2 through the first resistor R1, and the emitter of the first transistor Q1 is connected to the reference ground; a second transistor Q2, the base of the second transistor Q2 is suitable for receiving the drive control signal VB through the second resistor R2, the emitter of the second transistor Q2 is connected to the collector of the first transistor Q1, and the collector of the second transistor Q2 is suitable for outputting the clamp control signal V0.

[0066] Specifically, before the first zero-crossing point after electromagnetic heating arrives, a high-level enable signal V2 is given to the base of the first transistor Q1, and the first transistor Q1 is turned on. At the same time, the base of the second transistor Q2 follows the drive control signal VB output by the control unit 60 to be turned on, and the collector of the second transistor Q2 outputs a low-level clamping control signal V0 to control the clamping sub-circuit 42 to perform clamping operation.

[0067] After the first zero-crossing point after electromagnetic heating arrives, the low-level enable signal V2 is given to the base of the first transistor Q1, and the first transistor Q1 is turned off. Although the base of the second transistor Q2 can still be turned on by following the drive control signal VB output by the control unit 60, the collector of the second transistor Q2 does not provide the low-level clamping control signal V0, and the clamping sub-circuit 42 stops the clamping operation.

[0068] In this embodiment, the enable signal V2 and the drive control signal VB are received by the first transistor Q1 and the second transistor Q2 connected in series, respectively. When the enable signal V2 and the drive control signal VB are both at a high level, the first transistor Q1 and the second transistor Q2 connected in series are turned on and grounded, thereby outputting a low-level clamping control signal V0 to drive the clamping sub-circuit 42 to perform the clamping operation.

[0069] In one embodiment of the present invention, the clamp control subcircuit 41 includes: an AND gate U1, wherein a first input terminal of the AND gate U1 is adapted to receive an enable signal V2, and a second input terminal of the AND gate U1 is adapted to receive a drive control signal VB; a third transistor Q3, wherein a base of the third transistor Q3 is connected to an output terminal of the AND gate U1, an emitter of the third transistor Q3 is connected to a reference ground, and a collector of the third transistor Q3 is adapted to output a clamp control signal V0.

[0070] Specifically, before the first zero-crossing point after electromagnetic heating arrives, the AND gate U1 generates a high-level signal based on the high-level enable signal V2 and the high-level drive control signal VB to control the third transistor Q3 to turn on, and the collector of the third transistor Q3 outputs a low-level clamping control signal V0 to control the clamping sub-circuit 42 to perform clamping operation.

[0071] After the first zero-crossing point after electromagnetic heating arrives, the AND gate U1 always outputs a low-level signal based on the low-level enable signal V2, then the third transistor Q3 is cut off, and the collector of the third transistor Q3 no longer provides the low-level clamping control signal V0, then the clamping sub-circuit 42 stops clamping.

[0072] This embodiment performs a logical AND operation on the enable signal V2 and the drive control signal VB through the AND gate U1. Only when the enable signal V2 and the drive control signal VB are both at a high level does the third transistor Q3 turn on to output a low-level clamp control signal V0, thereby driving the clamp sub-circuit 42 to perform the clamping operation.

[0073] In one embodiment of the present invention, the clamping sub-circuit 42 includes: a first voltage-stabilizing diode D1, wherein the anode of the first voltage-stabilizing diode D1 is adapted to receive the clamping control signal V0; a fourth transistor Q4, wherein the base of the fourth transistor Q4 is connected to the cathode of the first voltage-stabilizing diode D1, the collector of the fourth transistor Q4 is adapted to receive the driving voltage of the power switch tube 20, and the emitter of the fourth transistor Q4 is adapted to output the clamped driving voltage VOUT; and a third resistor R3, wherein the third resistor R3 is connected between the base and collector of the fourth transistor Q4.

[0074] Specifically, before the first zero-crossing point after electromagnetic heating arrives, the clamping control subcircuit 41 outputs a low-level clamping control signal V0, the fourth transistor Q4 is cut off, and the driving voltage VCC before clamping is clamped through the first voltage regulator D1 to output the driving voltage VOUT after clamping, thereby realizing low-voltage drive of the power switch tube 20.

[0075] After the first zero-crossing point after electromagnetic heating arrives, the clamping control sub-circuit 41 no longer provides the low-level clamping control signal V0, and the fourth transistor Q4 is turned on. The driving voltage VCC before clamping is output through the turned-on fourth transistor Q4, so as to realize the driving voltage VCC before clamping driving the power switch tube 20.

[0076] by Figure 7 For example, the pre-clamping driving voltage VCC is 18V, and the post-clamping driving voltage VOUT is 8-11V. Before the first zero-crossing point after electromagnetic heating, the control unit 60 outputs a high-level enable signal V2 to the base of the first transistor Q1. Since the first transistor Q1 is turned on, and the base of the second transistor Q2 is turned on in response to the drive control signal VB output by the control unit 60, the drive voltage Vg of the power switch 20 is clamped to 8-11V by the first voltage regulator D1, achieving a clamped output. After the first zero-crossing point after electromagnetic heating, the control unit 60 outputs a low-level enable signal V2. At this point, the first transistor Q1 is turned off, preventing the second transistor Q2 from clamping the first voltage regulator D1. The third resistor R3 provides bias current, turning the fourth transistor Q4 on. Therefore, the pre-clamping driving voltage VCC output by the fourth transistor Q4 is 18V, maintaining the drive voltage Vg of the power switch 20 at 18V. Therefore, this embodiment realizes low-voltage switching of the power switch tube 20, thereby achieving the effect of reducing starting current and noise.

[0077] In one embodiment of the present invention, the driving unit 30 includes: a fifth transistor Q5, the base of the fifth transistor Q5 is suitable for receiving the driving control signal VB through the fourth resistor R4, the emitter of the fifth transistor Q5 is connected to the reference ground, and the collector of the fifth transistor Q5 is suitable for receiving the clamped driving voltage VOUT through the fifth resistor R5; a sixth transistor Q6, the base of the sixth transistor Q6 is suitable for being connected to the collector of the fifth transistor Q5 through the sixth resistor R6, the emitter of the sixth transistor Q6 is connected to the reference ground, and the collector of the sixth transistor Q6 is suitable for being connected to the collector of the fifth transistor Q5 through the sixth resistor R6. The base of the seventh transistor Q7 is connected to the collector of the sixth transistor Q6, and the collector of the seventh transistor Q7 is suitable for receiving the clamped driving voltage VOUT through the eighth resistor R8; the eighth transistor Q8 has a base connected to the base of the seventh transistor Q7, the collector of the eighth transistor Q8 is connected to the reference ground, and the emitter of the eighth transistor Q8 is connected to the emitter of the seventh transistor Q7, serving as the output end of the driving unit 30.

[0078] Specifically, when the drive control signal VB is at a high level, the fifth transistor Q5 is turned on, the sixth transistor Q6 is turned off, and the base of the seventh switch tube Q7 and the base of the eighth transistor Q8 are pulled up to a high level under the action of the seventh resistor Q7, then the seventh switch tube Q7 is turned on, the eighth transistor Q8 is turned off, the gate of the power switch tube 20 is at a high level, and the power switch tube 20 is turned on; when the drive control signal VB is at a low level, the fifth transistor Q5 is turned off, the base of the sixth transistor Q6 is pulled up to a high level under the action of the fifth resistor R5, then the sixth transistor Q6 is turned on, the base of the seventh switch tube Q7 and the base of the eighth transistor Q8 are grounded through the turned-on sixth transistor Q6, then the seventh switch tube Q7 is turned off, the eighth transistor Q8 is turned on, the gate of the power switch tube 20 is at a low level, and the power switch tube 20 is turned off.

[0079] In addition, the output end of the driving unit 30 can also be connected to the gate of the power switch tube 20 through the ninth resistor R9 to achieve current limiting through the ninth resistor R9. The gate of the power switch tube 20 can also be grounded through the second voltage regulator tube D2 and the tenth resistor R10 respectively, which is not limited here.

[0080] As a specific embodiment of the present application, the power supply unit 70 is used to provide a driving voltage VCC before clamping. The driving voltage VCC before clamping is 18V, which can make the power switch tube 20 work in the amplification area. The clamping unit 40 and the driving unit 30 are as follows. Figure 7 As shown, the clamping unit 40 is used to clamp the driving voltage VCC before clamping to 8-11V, that is, the driving voltage VOUT after clamping, so that the power switch tube 20 can work in the saturation region. The zero-crossing detection circuit is as shown in FIG. Figure 6 shown.

[0081] The AC mains signal is input via the live and neutral wires L and N and rectified into a DC output by the rectifier bridge 10. After receiving the heating start command, the control unit 60 generates a corresponding drive control signal VB and, before the first zero-crossing point after electromagnetic heating, outputs a high-level enable signal V2. At this point, the first transistor Q1 is turned on by the high-level enable signal V2. Simultaneously, when the drive control signal VB is high, the second transistor Q2 is turned on, and the pre-clamped drive voltage VCC is clamped to 8-11V by the first voltage regulator D1. Simultaneously, driven by the high-level drive control signal VB, the seventh transistor Q7 is turned on. The clamped drive voltage VOUT (8-11V) is output to the gate of the power switch 20 via the turned-on seventh transistor Q7, achieving low-voltage drive for the power switch 20, allowing it to operate in the saturation region. This effectively reduces the current peak during electromagnetic heating startup, noise, and grid voltage drop.

[0082] The control unit 60 controls the counter 62 to start counting after receiving the first zero-crossing point of the heating start instruction, and when the next zero-crossing point arrives, it determines that the first zero-crossing point after electromagnetic heating has arrived, counts by one and outputs a low-level enable signal V2. At this time, the first transistor Q1 is cut off under the action of the low-level enable signal V2, and the first voltage regulator D1 cannot be clamped through the second transistor Q2. At the same time, the third resistor R3 provides a bias current, and the fourth transistor Q4 is turned on. Therefore, the drive voltage VCC (18V) before clamping is output through the fourth transistor Q4. When the drive control signal VB is at a high level, the seventh transistor Q7 is turned on, and the pre-clamped drive voltage VCC (18V) is output to the gate of the power switch tube 20, thereby maintaining the gate voltage of the power switch tube 20, that is, the drive voltage Vg of the power switch tube 20, at 18V, thereby achieving high-voltage drive of the power switch tube 20, so that the power switch tube 20 switches from the saturation region to the amplification region, so that the saturation voltage drop of the power switch tube 20 is minimized, the loss under long-term full-load operation is small, and the temperature rise is low, thereby ensuring the normal operation of the electromagnetic heating equipment and the stability of the power grid.

[0083] This embodiment designs a drive clamp so that the power switch tube 20 operates in the saturation region when the heating is turned on, which can effectively reduce the current peak when the electromagnetic heating is started, reduce noise and grid voltage drop. At the same time, by detecting the zero-crossing point of the input voltage and when the zero-crossing count reaches the target value, that is, when the first zero-crossing point after electromagnetic heating is determined to have arrived, the power switch tube 20 is switched to the amplification region to operate, which can ensure the normal operation of the electromagnetic heating equipment and the stability of the grid. In this embodiment, the starting current is effectively reduced by 80%, from the initial 140A (such as Figure 3 As shown in the figure, it drops to about 30A. Figure 9 shown.

[0084] In summary, according to an embodiment of the present invention, the electromagnetic heating control circuit drives the power switch tube to turn on or off via a driving unit, clamps the driving voltage of the power switch tube via a clamping unit, detects the zero crossing point of the input power supply via a zero-crossing detection unit to output a zero-crossing detection signal, and controls the clamping unit to perform a clamping operation in response to a heating start instruction, so that the driving unit drives the power switch tube based on the clamped driving voltage. Upon determining, based on the zero-crossing detection signal, that the first zero crossing point after electromagnetic heating has arrived, the control unit controls the clamping unit to stop clamping, so that the driving unit drives the power switch tube based on the pre-clamping driving voltage, wherein the pre-clamping driving voltage is greater than the post-clamping driving voltage. Thus, when electromagnetic heating is started, the circuit clamps the driving voltage via the clamping unit, so that the power switch tube is driven by the lower clamped driving voltage, thereby achieving low-voltage driving of the power switch tube and effectively reducing startup current and noise. Furthermore, upon the arrival of the first zero crossing point after electromagnetic heating, the clamping of the driving voltage is stopped, ensuring normal electromagnetic heating operation.

[0085] Corresponding to the above embodiment, the present invention also proposes an electromagnetic heating device.

[0086] like Figure 10 As shown, the electromagnetic heating device 200 of the embodiment of the present invention includes the above-mentioned electromagnetic heating control circuit 100. The electromagnetic heating device 200 is an electrical appliance that converts electrical energy into thermal energy using the principle of electromagnetic induction, such as an induction cooker.

[0087] According to the electromagnetic heating device of an embodiment of the present invention, based on the above-mentioned electromagnetic heating control circuit, low-voltage driving of the power switch tube can be achieved when electromagnetic heating is started, effectively reducing the starting current and noise, and stopping the clamping of the driving voltage when the first zero crossing point after electromagnetic heating arrives, thereby ensuring the normal operation of the electromagnetic heating device and the stability of the power grid.

[0088] Corresponding to the above embodiment, the present invention further proposes a control method for electromagnetic heating equipment.

[0089] like Figure 10 As shown, in one embodiment of the present invention, the electromagnetic heating device 200 includes the above-mentioned electromagnetic heating control circuit 100.

[0090] like Figure 11 As shown, the control method of the electromagnetic heating device according to the embodiment of the present invention may include:

[0091] S1, in response to a heating start instruction, controlling the clamping unit to perform a clamping operation, so that the driving unit drives the power switch tube based on the clamped driving voltage;

[0092] S2, detecting the zero-crossing point of the input power supply to obtain a zero-crossing detection signal, and when it is determined based on the zero-crossing detection signal that the first zero-crossing point after electromagnetic heating has arrived, controlling the clamping unit to stop the clamping operation, so that the driving unit drives the power switch tube based on the driving voltage before clamping, wherein the driving voltage before clamping is greater than the driving voltage after clamping.

[0093] In one embodiment of the present invention, controlling the clamping unit to perform the clamping operation includes: simultaneously outputting a driving control signal and an enable signal to the clamping unit, so that the clamping unit performs the clamping operation.

[0094] As a specific embodiment of this application, Figure 12 As shown, the control method of the electromagnetic heating device may include the following steps:

[0095] S101, receiving a heating start instruction.

[0096] S102 , controlling the clamping unit to start a clamping operation, so as to clamp the driving voltage to 8-11V to drive the power switch tube.

[0097] S103, determining whether the first zero-crossing point after electromagnetic heating has arrived. If so, executing step S104; if not, executing step S103.

[0098] S104: Control the clamping unit to stop the clamping operation and drive the power switch tube with a driving voltage of 18V until the electromagnetic heating ends.

[0099] According to an embodiment of the present invention, a control method for electromagnetic heating equipment includes, first, in response to a heating start instruction, controlling a clamping unit to perform a clamping operation so that a driving unit drives a power switch tube based on a clamped driving voltage, detecting a zero-crossing point of an input power supply, and obtaining a zero-crossing detection signal. Furthermore, upon determining, based on the zero-crossing detection signal, that the first zero-crossing point after electromagnetic heating has arrived, controlling the clamping unit to stop the clamping operation so that the driving unit drives the power switch tube based on a pre-clamping driving voltage, wherein the pre-clamping driving voltage is greater than the post-clamping driving voltage. Thus, when electromagnetic heating is started, the method clamps the driving voltage via the clamping unit so that the power switch tube is driven by a lower clamped driving voltage, thereby achieving low-voltage driving of the power switch tube and effectively reducing startup current and noise. Furthermore, upon the arrival of the first zero-crossing point after electromagnetic heating, the clamping of the driving voltage is stopped, thereby ensuring the normal operation of the electromagnetic heating equipment and the stability of the power grid.

[0100] Corresponding to the above embodiment, the present invention further proposes a computer-readable storage medium.

[0101] The computer-readable storage medium of the embodiment of the present invention stores a computer program, which implements the control method of the electromagnetic heating device when executed by a processor.

[0102] According to the computer-readable storage medium of an embodiment of the present invention, when the computer program stored thereon is executed by a processor, the control method of the above-mentioned electromagnetic heating equipment is implemented. Based on the control method of the electromagnetic heating equipment, low-voltage driving of the power switch tube can be achieved when electromagnetic heating is started, effectively reducing the starting current and noise, and stopping the clamping of the driving voltage when the first zero crossing point after electromagnetic heating arrives, thereby ensuring the normal operation of the electromagnetic heating equipment and the stability of the power grid.

[0103] Corresponding to the above embodiment, the present invention also proposes an electromagnetic heating device.

[0104] like Figure 13 As shown, the electromagnetic heating device 200 of the embodiment of the present invention includes: a memory 210, a processor 220 and a computer program stored in the memory 210 and executable on the processor 220. When the processor 220 executes the computer program, the control method of the electromagnetic heating device described above is implemented.

[0105] According to the electromagnetic heating device of an embodiment of the present invention, when the processor executes the computer program, the control method of the electromagnetic heating device described above is implemented. Based on the control method of the electromagnetic heating device, low-voltage driving of the power switch tube can be achieved when electromagnetic heating is started, effectively reducing the starting current and noise, and stopping the clamping of the driving voltage when the first zero crossing point after electromagnetic heating arrives, thereby ensuring the normal operation of the electromagnetic heating device and the stability of the power grid.

[0106] It should be noted that the logic and / or steps represented in the flowcharts or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing the logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (e.g., a computer-based system, a system including a processor, or other system that can fetch and execute instructions from an instruction execution system, apparatus, or device). For purposes of this specification, a "computer-readable medium" can be any device that can contain, store, communicate, propagate, or transport a program for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (non-exhaustive list) of computer-readable media include the following: an electrical connection with one or more wires (electronic device), a portable computer disk cartridge (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and programmable read-only memory (EPROM or flash memory), fiber optic devices, and portable compact disc read-only memory (CDROM). Furthermore, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or processing it in another suitable manner if necessary, and then storing it in a computer memory.

[0107] It should be understood that various parts of the present invention can be implemented using hardware, software, firmware, or a combination thereof. In the above-described embodiments, multiple steps or methods can be implemented using software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented using hardware, as in another embodiment, any one of the following technologies known in the art or a combination thereof can be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application-specific integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0108] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0109] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0110] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0111] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. An electromagnetic heating control circuit, characterized in that: include: Power switch tube; A driving unit, configured to drive the power switch tube to be turned on or off; a clamping unit, configured to clamp the driving voltage of the power switch tube; a zero-crossing detection unit, configured to detect a zero-crossing point of an input power source to output a zero-crossing detection signal; The control unit is configured to control the clamping unit to perform a clamping operation in response to a heating start instruction, so that the driving unit drives the power switch tube based on the driving voltage after clamping, and control the clamping unit to stop the clamping operation when it is determined based on the zero-crossing detection signal that the first zero-crossing point after electromagnetic heating has arrived, so that the driving unit drives the power switch tube based on the driving voltage before clamping, wherein the driving voltage before clamping is greater than the driving voltage after clamping.

2. The electromagnetic heating control circuit according to claim 1, characterized in that: The control unit is further configured to simultaneously output a driving control signal and an enable signal to the clamping unit, so that the clamping unit performs a clamping operation.

3. The electromagnetic heating control circuit according to claim 1 or 2, characterized in that: The clamping unit comprises: a clamp control subcircuit configured to generate a clamp control signal based on the drive control signal and the enable signal output by the control unit; The clamping sub-circuit is configured to clamp the driving voltage of the power switch tube based on the clamping control signal to provide the clamped driving voltage to the driving unit.

4. The electromagnetic heating control circuit according to claim 3, characterized in that: The clamp control subcircuit includes: a first transistor, wherein a base of the first transistor is adapted to be connected to the enable signal via a first resistor, and an emitter of the first transistor is connected to a reference ground; A second transistor, wherein the base of the second transistor is adapted to be connected to the driving control signal via a second resistor, the emitter of the second transistor is connected to the collector of the first transistor, and the collector of the second transistor is adapted to output the clamping control signal.

5. The electromagnetic heating control circuit according to claim 3, characterized in that: The clamp control subcircuit includes: An AND gate, wherein a first input terminal of the AND gate is adapted to receive the enable signal, and a second input terminal of the AND gate is adapted to receive the drive control signal; A third triode, wherein the base of the third triode is connected to the output end of the AND gate, the emitter of the third triode is connected to the reference ground, and the collector of the third triode is suitable for outputting the clamping control signal.

6. The electromagnetic heating control circuit according to claim 3, characterized in that: The clamping sub-circuit comprises: a first voltage-stabilizing tube, wherein an anode of the first voltage-stabilizing tube is adapted to receive the clamping control signal; a fourth triode, wherein the base of the fourth triode is connected to the cathode of the first voltage-stabilizing tube, the collector of the fourth triode is adapted to be connected to the driving voltage of the power switching tube, and the emitter of the fourth triode is adapted to output the clamped driving voltage; A third resistor is connected between the base and the collector of the fourth transistor.

7. The electromagnetic heating control circuit according to claim 6, characterized in that: The driving unit includes: a fifth transistor, wherein a base of the fifth transistor is adapted to be connected to the drive control signal via a fourth resistor, an emitter of the fifth transistor is connected to a reference ground, and a collector of the fifth transistor is adapted to be connected to the clamped drive voltage via a fifth resistor; a sixth triode, wherein the base of the sixth triode is adapted to be connected to the collector of the fifth triode via a sixth resistor, the emitter of the sixth triode is connected to a reference ground, and the collector of the sixth triode is adapted to be connected to the clamped driving voltage via a seventh resistor; a seventh triode, wherein the base of the seventh triode is connected to the collector of the sixth triode, and the collector of the seventh triode is adapted to be connected to the clamped driving voltage via an eighth resistor; An eighth transistor, wherein the base of the eighth transistor is connected to the base of the seventh transistor, the collector of the eighth transistor is connected to the reference ground, and the emitter of the eighth transistor is connected to the emitter of the seventh transistor to serve as the output end of the driving unit.

8. An electromagnetic heating device, characterized in that: The electromagnetic heating control circuit comprises the electromagnetic heating control circuit according to any one of claims 1 to 7.

9. A control method for electromagnetic heating equipment, characterized in that: The electromagnetic heating device comprises an electromagnetic heating control circuit according to any one of claims 1 to 7, and the method comprises: In response to a heating start instruction, controlling the clamping unit to perform a clamping operation, so that the driving unit drives the power switch tube based on the clamped driving voltage; The zero-crossing point of the input power supply is detected to obtain a zero-crossing detection signal, and when it is determined based on the zero-crossing detection signal that the first zero-crossing point after electromagnetic heating has arrived, the clamping unit is controlled to stop the clamping operation, so that the driving unit drives the power switch tube based on the driving voltage before clamping, wherein the driving voltage before clamping is greater than the driving voltage after clamping.

10. The method according to claim 9, characterized in that Controlling the clamping unit to perform a clamping operation includes: The driving control signal and the enabling signal are simultaneously output to the clamping unit so that the clamping unit performs a clamping operation.

11. A computer-readable storage medium, characterized in that A computer program is stored thereon, and when the computer program is executed by a processor, the control method of the electromagnetic heating device according to claim 9 or 10 is implemented.

12. An electromagnetic heating device, characterized in that: include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the control method for the electromagnetic heating device according to claim 9 or 10 is implemented.

Images