Integrated electromagnetic stove control circuit with built-in IGBT direct drive module

Abstract

The utility model relates to the technical field of electromagnetic oven, disclose an integrated electromagnetic oven control circuit of built -in IGBT direct drive module, include: MCU main control circuit, burn write mouth, IGBT power tube, IGBT temperature detection circuit, pot bottom temperature detection circuit, voltage detection circuit, switching power supply circuit, 5V LDO conversion circuit, through the integration of drive circuit to MCU inside, directly reduced the external component quantity, such as the external drive chip and its peripheral circuit are saved.This not only reduces the material purchasing cost and the wiring complexity and area of PCB board, reduces the potential fault point, thereby promotes the long -term operation reliability of complete machine. MCU built -in drive shortens the transmission path of PWM drive signal, effectively reduces the influence of external space electromagnetic interference to control signal, and adopts multistage RC filter in voltage detection circuit, purifies sampling signal, strengthens the immunity of system to all kinds of interference, ensures the timeliness and accuracy of power regulation and all kinds of protection.

Description

Technical Field

[0001] This utility model relates to the field of induction cooker technology, specifically to an integrated induction cooker control circuit with a built-in IGBT direct drive module. Background Technology

[0002] An induction cooker is a modern kitchen appliance that uses the principle of electromagnetic induction to heat food. It generates a high-frequency alternating current (typically 20-40kHz) through an electronic circuit board, which flows through a coil beneath a high-strength, heat-resistant ceramic plate, thus creating an alternating magnetic field. When the magnetic field lines pass through the bottom of the cookware, countless powerful eddy currents are generated, causing the cookware itself to heat up rapidly, thereby heating the food inside.

[0003] A search revealed that patent application number CN202223134142.6 discloses a mainboard for a dual-head induction cooker, comprising a left MCU and a right MCU. The left MCU is connected to a left programming port, a left IGBT drive circuit, a left IGBT sensor detection circuit, and a left pot bottom sensor detection circuit. A switching power supply, a surge protection circuit, and a communication interface are connected in parallel between the left and right MCUs. The right MCU is connected to a right programming port, a right IGBT drive circuit, a right IGBT sensor detection circuit, and a right pot bottom sensor detection circuit. Through the cooperation of the switching power supply, the left and right MCUs, the communication interface, and the left and right IGBT drive circuits, the heating functions of the left and right boilers can be controlled. Assembly requires only one mainboard, simplifying the assembly structure. Through the cooperation of the left and right MCUs and the surge protection circuit, when there is a momentary high voltage in the mains voltage, the left and right MCUs will issue a command to shut down the power output, protecting the circuit and improving safety.

[0004] Traditional induction cooker motherboards require additional driver chips and their peripheral circuits, increasing the complexity of the motherboard layout and the number of components. Discrete driver chips and additional passive components increase material and production costs. More components and connection points mean a higher failure rate. Signal transmission between the external driver chip and the MCU is also more susceptible to interference. Therefore, we need to propose an integrated induction cooker control circuit with a built-in IGBT direct drive module. Utility Model Content

[0005] The purpose of this invention is to provide an integrated induction cooker control circuit with a built-in IGBT direct drive module. The MCU main control circuit integrates the drive circuit and directly outputs PWM signals to drive the IGBT, eliminating the need for external discrete drive chips and significantly simplifying the motherboard circuit structure. Through optimized circuit design, the stability and anti-interference capability of each module are ensured, thereby solving the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: an integrated induction cooker control circuit with a built-in IGBT direct drive module, comprising:

[0007] An MCU main control circuit that integrates a core processing unit, memory, and drive circuitry;

[0008] It serves as the programming and debugging interface for the MCU main control circuit, and writes the firmware program that controls all the logic of the induction cooker into the programming port in the internal memory of the MCU main control circuit.

[0009] IGBT power transistors that are controlled by PWM signals from the MCU main control circuit and switched on and off at high speed;

[0010] An IGBT temperature detection circuit for real-time monitoring of IGBT power transistor temperature;

[0011] A pot bottom temperature detection circuit that detects the temperature of the bottom of the pot to achieve temperature control and pot-free protection;

[0012] A voltage detection circuit for real-time monitoring of household AC power supply voltage;

[0013] A switching power supply circuit that provides the required operating voltage to the components on the main board of the induction cooker;

[0014] A 5V-LDO conversion circuit that converts the 18V voltage generated by the switching power supply circuit into a stable 5V voltage;

[0015] The programming port, IGBT power transistor, IGBT temperature detection circuit, pot bottom temperature detection circuit, voltage detection circuit, switching power supply circuit, and 5V-LDO conversion circuit are all electrically connected to the MCU main control circuit, and the switching power supply circuit is electrically connected to the 5V-LDO conversion circuit.

[0016] Preferably, the MCU main control circuit includes a main control chip U2. Pin 1 of the main control chip U2 is connected to a capacitor C18 and a capacitor EC6 connected in parallel. Pins 2 and 4 of the main control chip U2 are connected in parallel to a capacitor C36 and a resistor R60. Pin 6 of the main control chip U2 is connected to a series resistor R78, a resistor R39, a resistor R4, and a series resistor R79 and a resistor R56. Pin 9 of the main control chip U2 is connected to a resistor R46 and a capacitor C24 and a resistor R6 connected in parallel. Pin 12 of the main control chip U2 is connected to a capacitor C17 and a resistor R6. Pin 20 of the main control chip U2 is connected to a capacitor C16 and a capacitor EC5 connected in parallel.

[0017] Preferably, the programming port includes a connector CN3, pin 1 of the connector CN3 is grounded, pin 2 of the connector CN3 is connected to pin 1 of the main control chip U2, pin 3 of the connector CN3 is connected to pin 5 of the main control chip U2, and pin 4 of the connector CN3 is connected to pin 7 of the main control chip U2.

[0018] Preferably, the IGBT temperature detection circuit includes a resistor R47, a jumper JR3, and a jumper JR4 connected in parallel. One end of the resistor R47 is connected to pin 1 of the main control chip U2. One end of the jumper JR3 is connected to a grounded thermistor RT1. One end of the jumper JR4 is connected in series with a resistor R54 and a capacitor C20. The terminals of the resistor R54 and the capacitor C20 are connected to pin 8 of the main control chip U2.

[0019] Preferably, the pot bottom temperature detection circuit includes a connector CN5, and pins 1 and 2 of the connector CN5 are connected to a resistor R53, a capacitor C19 and a resistor R66 to form a closed loop. The terminals of the resistor R53 and the capacitor C19 are connected to pin 3 of the main control chip U2.

[0020] Preferably, the IGBT power transistor includes transistor IGBT1. A resistor R50, a jumper JR1, and a resistor R69 are connected between the gate of transistor IGBT1 and pin 19 of the main control chip U2. A Zener diode ZD1 and a resistor R41 are connected in parallel between the gate and the source of transistor IGBT1. A capacitor C2 is connected between the source and the drain of transistor IGBT1. A resonant capacitor C7 and a differential mode inductor L1 are connected in series on the drain of transistor IGBT1.

[0021] A series of resistors R29, R28, R27, R26, R25, R24, R58, R38, capacitors C27, C28, C30, R64, R23, R22, R21, R20, and R19 are connected between the drain of the IGBT1 and one end of the differential mode inductor L1. The terminals of resistors R58 and R38, and the terminals of capacitors C27 and C28 are connected to pin 15 of the main control chip U2. The terminals of resistors R64 and R23, and the terminals of capacitors C28 and C30 are connected to pin 14 of the main control chip U2.

[0022] Preferably, the voltage detection circuit includes a rectifier bridge DB1. A diode D2 is connected to pin 1 of the rectifier bridge DB1, and a diode D1 is connected to pin 2 of the rectifier bridge DB1. A closed-loop resistor R30, resistor R31, resistor R33, resistor R67, resistor R40, resistor R35, resistor R34, and resistor R32 are connected to the terminals of diodes D1 and D2. A capacitor C4 is connected in parallel with resistor R34. Capacitors C23 and C21 are connected in parallel with the terminals of resistors R33 and R67. Capacitors C31 and C32 are connected in parallel with the terminals of resistors R35 and R40.

[0023] Preferably, the switching power supply circuit includes an AC / DC conversion chip U1, connectors CN1 and CN2 connected to the AC / DC conversion chip U1, and a transformer T1. Pin 1 of the AC / DC conversion chip U1 is connected to pin 4 of the transformer T1. A diode D4 and a Zener diode ZD4 are connected between pin 3 of the AC / DC conversion chip U1 and pin 1 of the transformer T1. Pin 1 of the transformer T1 is also connected to capacitors EC3 and C34, resistors R75 and R76 in parallel, as well as diodes D7 and D8 in parallel. A diode D3 and a capacitor EC4 are connected between pins 5 and 7 of the transformer T1.

[0024] Preferably, the 5V-LDO conversion circuit includes a voltage regulator chip U4 and a voltage regulator chip U5. A capacitor EC9 and a capacitor C15 are connected in parallel between pins 1 and 2 of the voltage regulator chip U4. A jumper J15 is also connected to pin 1 of the voltage regulator chip U4. A capacitor EC10 and a capacitor C14 are connected in parallel between pins 1 and 2 of the voltage regulator chip U5. A jumper J14 is also connected to pin 1 of the voltage regulator chip U5. Jumpers J14 and J15 are connected together to a resistor R74 and a Zener diode ZD5, which are connected in series. The terminals of jumpers J14 and J15 are connected to the terminals of diode D3 and capacitor EC4.

[0025] Compared with the prior art, the beneficial effects of this utility model are:

[0026] 1. This utility model integrates the drive circuit into the MCU, directly reducing the number of external components, such as eliminating the need for an external drive chip and its peripheral circuitry. This not only reduces material procurement costs and the complexity and area of ​​PCB wiring, but also reduces potential failure points, thereby improving the long-term operational reliability of the entire device.

[0027] 2. The built-in driver of this utility model shortens the transmission path of the PWM drive signal, effectively reducing the impact of external electromagnetic interference on the control signal, making the switching control of IGBT more precise and reliable. In addition, the voltage detection circuit adopts multi-stage RC filtering to purify the sampling signal, enhance the system's immunity to various interferences, and ensure the timeliness and accuracy of power regulation and various protections.

[0028] 3. This utility model drives the IGBT to work by amplifying the push-pull drive. It is a built-in driver of the MCU. The signal from the MCU can directly drive the IGBT without the need for a push-pull circuit. This facilitates production, reduces the number of external components, and lowers costs. Attached Figure Description

[0029] Figure 1 This is a system block diagram of the present invention;

[0030] Figure 2 This is a circuit diagram of the MCU main control circuit of this utility model;

[0031] Figure 3 This is a circuit diagram of the programming port of this utility model;

[0032] Figure 4 This is a circuit diagram of the IGBT temperature detection circuit of this utility model;

[0033] Figure 5 This is a circuit diagram of the pot bottom temperature detection circuit of this utility model;

[0034] Figure 6 The circuit diagram of the IGBT power transistor of this utility model is shown below.

[0035] Figure 7 This is a circuit diagram of the voltage detection circuit of this utility model;

[0036] Figure 8 This is a circuit diagram of the switching power supply circuit of this utility model;

[0037] Figure 9 This is the circuit diagram of the 5V-LDO conversion circuit of this utility model. Detailed Implementation

[0038] The technical solutions of the present utility model 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 utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0039] Please see Figure 1-9This utility model provides a technical solution: an integrated induction cooker control circuit with a built-in IGBT direct drive module, comprising:

[0040] An MCU main control circuit that integrates a core processing unit, memory, and drive circuitry;

[0041] The MCU main control circuit includes a main control chip U2. Pin 1 of the main control chip U2 is connected to a capacitor C18 and a capacitor EC6 connected in parallel. Pins 2 and 4 of the main control chip U2 are connected in parallel with a capacitor C36 and a resistor R60. Pin 6 of the main control chip U2 is connected to a series resistor R78, a resistor R39, and a resistor R4, as well as a series resistor R79 and a resistor R56. Pin 9 of the main control chip U2 is connected to a resistor R46, a capacitor C24, and a resistor R6 connected in parallel. Pin 12 of the main control chip U2 is connected to a capacitor C17 and a resistor R6. Pin 20 of the main control chip U2 is connected to a capacitor C16 and a capacitor EC5 connected in parallel.

[0042] The main control chip U2 is used to receive 18V and 5V voltages to provide working power. The main control chip U2 generates PWM signals to drive IGBT power transistors and control heating power. It also reads analog signals such as temperature and voltage through the PB0 or ​​AN0 pins of the main control chip U2. When executing user commands, it realizes various cooking modes and safety protection.

[0043] Capacitors EC5 and EC6 are used for low-frequency filtering to smooth the power supply voltage and suppress power supply ripple. Capacitors C17 and C18 are used for high-frequency decoupling to absorb high-frequency noise on the power line and provide a clean power supply for the main control chip U2.

[0044] The voltage divider circuit (resistors R39, R78, R79, etc.) converts the changing resistance value of the external sensor into a changing voltage signal, which is then sent to the ADC pin of the main control chip U2. Pin VREF is the reference voltage source for the internal ADC of the main control chip U2.

[0045] It serves as the programming and debugging interface for the MCU main control circuit, and writes the firmware program that controls all the logic of the induction cooker into the programming port in the internal memory of the MCU main control circuit.

[0046] The programming port includes a connector CN3, pin 1 of the connector CN3 is grounded, pin 2 of the connector CN3 is connected to pin 1 of the main control chip U2, pin 3 of the connector CN3 is connected to pin 5 of the main control chip U2, and pin 4 of the connector CN3 is connected to pin 7 of the main control chip U2.

[0047] Pin 2 of connector CN3 provides a 5V DC voltage to the outside, pin 3 of connector CN3 is connected to the data signal line, and pin 4 of connector CN3 is connected to the data clock signal line for synchronous data transmission.

[0048] IGBT power transistors that are controlled by PWM signals from the MCU main control circuit and switched on and off at high speed;

[0049] The IGBT power transistor includes transistor IGBT1. A resistor R50, a jumper JR1, and a resistor R69 are connected between the gate of transistor IGBT1 and pin 19 of the main control chip U2. A Zener diode ZD1 and a resistor R41 are connected in parallel between the gate and the source of transistor IGBT1. A capacitor C2 is connected between the source and the drain of transistor IGBT1. A resonant capacitor C7 and a differential mode inductor L1 are connected in series on the drain of transistor IGBT1.

[0050] A series of resistors R29, R28, R27, R26, R25, R24, R58, R38, capacitors C27, C28, C30, R64, R23, R22, R21, R20, and R19 are connected between the drain of the IGBT1 and one end of the differential mode inductor L1. The terminals of resistors R58 and R38, and the terminals of capacitors C27 and C28 are connected to pin 15 of the main control chip U2. The terminals of resistors R64 and R23, and the terminals of capacitors C28 and C30 are connected to pin 14 of the main control chip U2.

[0051] Resistors R50 and R69 limit the gate charging current of IGBT1 to prevent excessive inrush current; their resistance values ​​affect the switching speed of IGBT1. Zener diode ZD1 acts as a gate clamping protection, clamping the maximum gate voltage of IGBT1 to 18V to prevent damage to the IGBT1 gate due to excessive drive voltage.

[0052] Resistor R41 is a pull-down resistor, which ensures that when transistor IGBT1 has no output, the gate of transistor IGBT1 is reliably pulled low and is in the off state.

[0053] Constantan wire is a piece of alloy resistance wire with extremely low and precise resistance. According to Ohm's law, when a large current flows through it, a weak voltage difference is generated across its two ends. This weak voltage signal is sent to the subsequent operational amplifier for amplification and finally to the MCU main control circuit. The main control chip U2 monitors this signal, calculates the output power in real time, and immediately shuts down the drive to protect the IGBT1 transistor when the current is too high.

[0054] An IGBT temperature detection circuit for real-time monitoring of IGBT power transistor temperature;

[0055] The IGBT temperature detection circuit includes a resistor R47, a jumper JR3, and a jumper JR4 connected in parallel. One end of the resistor R47 is connected to pin 1 of the main control chip U2. One end of the jumper JR3 is connected to a grounded thermistor RT1. One end of the jumper JR4 is connected in series with a resistor R54 and a capacitor C20. The terminals of the resistor R54 and the capacitor C20 are connected to pin 8 of the main control chip U2.

[0056] A pot bottom temperature detection circuit that detects the temperature of the bottom of the pot to achieve temperature control and pot-free protection;

[0057] The pot bottom temperature detection circuit includes a connector CN5. Pins 1 and 2 of the connector CN5 are connected to a resistor R53, a capacitor C19, and a resistor R66 to form a closed loop. The terminals of the resistor R53 and the capacitor C19 are connected to pin 3 of the main control chip U2.

[0058] An external NTC thermistor is also connected to the terminals of resistor R53 and capacitor C19. Its resistance decreases as the temperature rises. The NTC thermistor is installed below the microcrystalline ceramic panel to sense the temperature change at the bottom of the cookware. Pin 1 of connector CN5 is connected to the AD-NTC-L signal line for reading the voltage, and pin 3 of connector CN5 is connected to 5VCC-L to provide a reference voltage for the external NTC thermistor.

[0059] A voltage detection circuit for real-time monitoring of household AC power supply voltage;

[0060] The voltage detection circuit includes a rectifier bridge DB1. A diode D2 is connected to pin 1 of the rectifier bridge DB1, and a diode D1 is connected to pin 2 of the rectifier bridge DB1. Closed-loop resistors R30, R31, R33, R67, R40, R35, R34, and R32 are connected to the terminals of diodes D1 and D2. A capacitor C4 is connected in parallel with resistor R34. Capacitors C23 and C21 are connected in parallel with the terminals of resistors R33 and R67. Capacitors C31 and C32 are connected in parallel with the terminals of resistors R35 and R40.

[0061] A capacitor C1 is connected to pin 1 of the rectifier bridge DB1. The capacitor C1 is used to suppress differential mode interference. Diodes D1 and D2, together with two other diodes inside the rectifier bridge DB1, form a complete bridge rectifier circuit. By utilizing some components of the bridge rectifier, the cost can be optimized.

[0062] Multiple resistors (R30-R35) are connected in series to form a voltage divider, which distributes the power consumption of the high voltage box and obtains a low voltage signal V_Surge that is reduced proportionally.

[0063] Capacitors C23 and C21 are used to filter out high-frequency noise in the sampled signal, while capacitors C31 and C32 filter out high-frequency noise.

[0064] A switching power supply circuit that provides the required operating voltage to the components on the main board of the induction cooker;

[0065] The switching power supply circuit includes an AC / DC conversion chip U1, connectors CN1 and CN2 connected to the AC / DC conversion chip U1, and a transformer T1. Pin 1 of the AC / DC conversion chip U1 is connected to pin 4 of the transformer T1. A diode D4 and a Zener diode ZD4 are connected between pin 3 of the AC / DC conversion chip U1 and pin 1 of the transformer T1. Pin 1 of the transformer T1 is also connected to capacitors EC3 and C34, resistors R75 and R76 in parallel, as well as diodes D7 and D8 in parallel. A diode D3 and a capacitor EC4 are connected between pins 5 and 7 of the transformer T1.

[0066] Connectors CN1 and CN2 are used to introduce alternating current. Diodes D9 and D10 form a half-wave rectifier circuit to rectify the AC input into pulsating direct current. Capacitor EC1 is used to smooth the rectified direct current.

[0067] The AC / DC converter chip U1 is a packaged chip integrating a PWM controller and a MOSFET. Internally, it contains an oscillator, drive circuit, high-voltage switch, and various protection circuits. Transformer T1: When the high-voltage switch inside the AC / DC converter chip U1 is turned on, electrical energy is stored in the primary winding in the form of a magnetic field. When the high-voltage switch is turned off, the magnetic field dissipates, inducing a voltage in the secondary winding, which is then rectified and output.

[0068] Resistor R1 limits inrush current, capacitor C33 absorbs voltage spikes caused by leakage inductance in transformer T1, protecting the high-voltage switching transistor inside AC / DC converter chip U1 from reverse voltage spikes. Diode D3 rectifies the secondary AC to DC, capacitor EC2 smooths the rectified voltage, and capacitor EC3 provides 18V DC after filtering. Zener diode ZD4 provides overvoltage protection; when the output voltage exceeds 18V, Zener diode ZD4 breaks down and conducts, clamping the voltage and protecting the subsequent circuitry.

[0069] A 5V-LDO conversion circuit that converts the 18V voltage generated by the switching power supply circuit into a stable 5V voltage;

[0070] The 5V-LDO conversion circuit includes voltage regulator chip U4 and voltage regulator chip U5. A capacitor EC9 and a capacitor C15 are connected in parallel between pins 1 and 2 of voltage regulator chip U4. A jumper J15 is also connected to pin 1 of voltage regulator chip U4. A capacitor EC10 and a capacitor C14 are connected in parallel between pins 1 and 2 of voltage regulator chip U5. A jumper J14 is also connected to pin 1 of voltage regulator chip U5. Jumpers J14 and J15 are connected together to a resistor R74 and a Zener diode ZD5, which are connected in series. The terminals of jumpers J14 and J15 are connected to the terminals of diode D3 and capacitor EC4.

[0071] The voltage regulator chip U4 stabilizes the input voltage down to 5V output. Capacitor C15 is a high-frequency decoupling capacitor used to filter out high-frequency noise on the input power line and prevent the voltage regulator chip U4 from self-oscillating. Capacitor EC9 is an electrolytic capacitor used for low-frequency filtering, smoothing the output voltage, providing the energy required when the load current changes instantaneously, and enhancing the load-carrying capacity.

[0072] The programming port, IGBT power transistor, IGBT temperature detection circuit, pot bottom temperature detection circuit, voltage detection circuit, switching power supply circuit, and 5V-LDO conversion circuit are all electrically connected to the MCU main control circuit, and the switching power supply circuit is electrically connected to the 5V-LDO conversion circuit.

[0073] After AC power is input, the switching power supply circuit starts working, generating 18V voltage. The 5V-LDO conversion circuit provides precise power to the MCU main control circuit, enabling the MCU main control circuit to start running the program. The MCU main control circuit monitors the mains voltage through the voltage detection circuit and the cooktop temperature through the IGBT temperature detection circuit, waiting for user instructions. The user places the pot on the induction cooker and selects a function. The MCU main control circuit confirms the presence of a pot through the pot bottom temperature detection circuit. Based on the set power and real-time voltage, the MCU main control circuit calculates a suitable PWM signal and then amplifies the signal through the built-in drive circuit to drive the IGBT power transistor to switch at high speed, causing the heating coil to generate a magnetic field and heat the pot. During use, the MCU main control circuit continuously monitors the IGBT temperature (to prevent overheating and burnout), the pot bottom temperature (to prevent dry burning and achieve temperature control), and the mains voltage (to prevent overvoltage / undervoltage damage). If any abnormality is detected, the MCU main control circuit immediately adjusts or cuts off the PWM output to stop heating.

[0074] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An integrated electromagnetic stove control circuit with built-in IGBT direct drive module, characterized in that, include: The MCU main control circuit integrates the core processing unit, memory, and drive circuit; It serves as the programming and debugging interface for the MCU main control circuit, and writes the firmware program that controls all the logic of the induction cooker into the programming port in the internal memory of the MCU main control circuit. IGBT power transistors that are controlled by PWM signals from the MCU main control circuit and switched on and off at high speed; An IGBT temperature detection circuit for real-time monitoring of IGBT power transistor temperature; A pot bottom temperature detection circuit that detects the temperature of the bottom of the pot to achieve temperature control and pot-free protection; A voltage detection circuit for real-time monitoring of household AC power supply voltage; A switching power supply circuit that provides the required operating voltage to the components on the main board of the induction cooker; A 5V-LDO conversion circuit that converts the 18V voltage generated by the switching power supply circuit into a stable 5V voltage; The programming port, IGBT power transistor, IGBT temperature detection circuit, pot bottom temperature detection circuit, voltage detection circuit, switching power supply circuit, and 5V-LDO conversion circuit are all electrically connected to the MCU main control circuit, and the switching power supply circuit is electrically connected to the 5V-LDO conversion circuit.

2. The integrated electromagnetic oven control circuit of claim 1, wherein: The MCU main control circuit includes a main control chip U2. Pin 1 of the main control chip U2 is connected to a capacitor C18 and a capacitor EC6 connected in parallel. Pins 2 and 4 of the main control chip U2 are connected in parallel with a capacitor C36 and a resistor R60. Pin 6 of the main control chip U2 is connected to a series resistor R78, a resistor R39, and a resistor R4, as well as a series resistor R79 and a resistor R56. Pin 9 of the main control chip U2 is connected to a resistor R46, a capacitor C24, and a resistor R6 connected in parallel. Pin 12 of the main control chip U2 is connected to a capacitor C17 and a resistor R6. Pin 20 of the main control chip U2 is connected to a capacitor C16 and a capacitor EC5 connected in parallel.

3. The integrated induction cooker control circuit with a built-in IGBT direct drive module according to claim 2, characterized in that: The programming port includes a connector CN3, pin 1 of the connector CN3 is grounded, pin 2 of the connector CN3 is connected to pin 1 of the main control chip U2, pin 3 of the connector CN3 is connected to pin 5 of the main control chip U2, and pin 4 of the connector CN3 is connected to pin 7 of the main control chip U2.

4. The integrated induction cooker control circuit with a built-in IGBT direct drive module according to claim 3, characterized in that: The IGBT temperature detection circuit includes a resistor R47, a jumper JR3, and a jumper JR4 connected in parallel. One end of the resistor R47 is connected to pin 1 of the main control chip U2. One end of the jumper JR3 is connected to a grounded thermistor RT1. One end of the jumper JR4 is connected in series with a resistor R54 and a capacitor C20. The terminals of the resistor R54 and the capacitor C20 are connected to pin 8 of the main control chip U2.

5. The integrated electromagnetic stove control circuit of claim 4, wherein: The pot bottom temperature detection circuit includes a connector CN5. Pins 1 and 2 of the connector CN5 are connected to a resistor R53, a capacitor C19, and a resistor R66 to form a closed loop. The terminals of the resistor R53 and the capacitor C19 are connected to pin 3 of the main control chip U2.

6. The integrated electromagnetic oven control circuit of claim 5, wherein: The IGBT power transistor includes transistor IGBT1. A resistor R50, a jumper JR1, and a resistor R69 are connected between the gate of transistor IGBT1 and pin 19 of the main control chip U2. A Zener diode ZD1 and a resistor R41 are connected in parallel between the gate and the source of transistor IGBT1. A capacitor C2 is connected between the source and the drain of transistor IGBT1. A resonant capacitor C7 and a differential mode inductor L1 are connected in series on the drain of transistor IGBT1. A series of resistors R29, R28, R27, R26, R25, R24, R58, R38, capacitors C27, C28, C30, R64, R23, R22, R21, R20, and R19 are connected between the drain of the IGBT1 and one end of the differential mode inductor L1. The terminals of resistors R58 and R38, and the terminals of capacitors C27 and C28 are connected to pin 15 of the main control chip U2. The terminals of resistors R64 and R23, and the terminals of capacitors C28 and C30 are connected to pin 14 of the main control chip U2.

7. The integrated electromagnetic stove control circuit of claim 6, wherein: The voltage detection circuit includes a rectifier bridge DB1. A diode D2 is connected to pin 1 of the rectifier bridge DB1, and a diode D1 is connected to pin 2 of the rectifier bridge DB1. A closed-loop resistor R30, resistor R31, resistor R33, resistor R67, resistor R40, resistor R35, resistor R34, and resistor R32 are connected to the terminals of diodes D1 and D2. A capacitor C4 is connected in parallel with resistor R34. Capacitors C23 and C21 are connected in parallel with the terminals of resistors R33 and R67. Capacitors C31 and C32 are connected in parallel with the terminals of resistors R35 and R40.

8. The integrated electromagnetic oven control circuit with built-in IGBT direct drive module according to claim 7, characterized in that: The switching power supply circuit includes an AC / DC conversion chip U1, connectors CN1 and CN2 connected to the AC / DC conversion chip U1, and a transformer T1. Pin 1 of the AC / DC conversion chip U1 is connected to pin 4 of the transformer T1. A diode D4 and a Zener diode ZD4 are connected between pin 3 of the AC / DC conversion chip U1 and pin 1 of the transformer T1. Pin 1 of the transformer T1 is also connected to capacitors EC3 and C34, resistors R75 and R76 in parallel, as well as diodes D7 and D8 in parallel. A diode D3 and a capacitor EC4 are connected between pins 5 and 7 of the transformer T1.

9. An integrated induction cooker control circuit with a built-in IGBT direct drive module according to claim 8, characterized in that: The 5V-LDO conversion circuit includes voltage regulator chip U4 and voltage regulator chip U5. A capacitor EC9 and a capacitor C15 are connected in parallel between pins 1 and 2 of voltage regulator chip U4. A jumper J15 is also connected to pin 1 of voltage regulator chip U4. A capacitor EC10 and a capacitor C14 are connected in parallel between pins 1 and 2 of voltage regulator chip U5. A jumper J14 is also connected to pin 1 of voltage regulator chip U5. Jumpers J14 and J15 are connected together to a resistor R74 and a Zener diode ZD5, which are connected in series. The terminals of jumpers J14 and J15 are connected to the terminals of diode D3 and capacitor EC4.

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