Control circuit of air fryer

Abstract

The utility model discloses a control circuit of an air fryer, which comprises a heat dissipation circuit, an indicating lamp circuit, a heating circuit, a low-pressure control circuit, a temperature sensing circuit, a buzzer circuit, an interface circuit, a display screen circuit, an LED lamp circuit, a main control circuit and a power distribution circuit, and the heat dissipation circuit comprises a heat dissipation fan FAN1, a transistor TR1 and a resistor R7. The control circuit comprises a temperature sensing circuit, a heating circuit and a heat dissipation circuit, the temperature sensing circuit comprises a transistor TR2, an indicating lamp LAMP and a resistor R14, the indicating lamp circuit comprises a transistor TR2, an indicating lamp LAMP and a resistor R14, and the heating circuit comprises a resistor R20, a capacitor C4 and a diode D8. The temperature sensing circuit senses the processing temperature in the air fryer in real time, when high-temperature errors occur, the cooling fan on the cooling circuit is turned on to cool the air fryer, the phenomenon that products are burnt is avoided, and the processing efficiency of the air fryer is improved.

Description

Technical Field

[0001] This utility model relates to the field of air fryer technology, specifically to a control circuit for an air fryer. Background Technology

[0002] Air fryers can help you make crispy fried chicken and fragrant fries without using a drop of oil, saving time, effort, and electricity. The biggest advantage of air fryers is "oil-free cooking." Traditional frying requires a lot of cooking oil, which is not only high in calories but also easily produces harmful substances. Air fryers, through hot air circulation technology, can make crispy foods with little or no oil, such as fried chicken, chicken wings, and fries. They taste crispy on the outside and tender on the inside, but the fat content is much lower, making them especially suitable for people who pursue a healthy diet. Many people find cooking troublesome, but air fryers are very easy to operate. Just put the food in, set the time and temperature, and it will automatically heat and flip the food. You don't need to watch it at all. For example, frying chicken wings only takes 20 minutes, half the time of traditional frying, and you don't need to keep an eye on the pot. It's worry-free and convenient. Air fryers use control circuits to control the opening and closing of the air fryer.

[0003] However, traditional air fryers have the following drawbacks:

[0004] Traditional air fryers use a single control circuit to process products. This can lead to large temperature errors during the heating process, causing the products to burn and reducing the processing efficiency of the air fryer. Utility Model Content

[0005] The purpose of this invention is to provide a control circuit for an air fryer, in order to solve the problem mentioned in the background art that the traditional air fryer control circuit only processes the product, and that the temperature error is prone to occur during the heating process of the air fryer, resulting in the product burning and reducing the processing efficiency of the air fryer.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a control circuit for an air fryer, comprising a heat dissipation circuit, an indicator light circuit, a heating circuit, a low-pressure control circuit, a temperature sensing circuit, a buzzer circuit, an interface circuit, a display screen circuit, an LED light circuit, a main control circuit, and a power distribution circuit. The heat dissipation circuit includes a cooling fan FAN1, a transistor TR1, and a resistor R7. The indicator light circuit includes a transistor TR2, an indicator light LAMP, and a resistor R14. The heating circuit includes a resistor R20, a capacitor C4, a diode D8, a diode D7, a surface-mount capacitor EC4, a resistor R18, a resistor R19, a resistor R16, a transistor Q3, and a transistor... The components include transistor Q2, diode D6, socket J2, relay RY1, and heating element HEAT1. The low-pressure control circuit includes control chip IC1, inductor L1, surface mount capacitors EC1 and EC2, diodes D2 and D1, resistors R2 and R5, capacitor CX1, zinc oxide nonlinear resistor ZNR1, fuse F1, resistors R12 and R13, diode D5 and R15, transistor Q1, resistor R8 and R11, zero-adjustment potentiometer RW1, resistors R1, R3, and R4, capacitors C1 and C2, inductor L2, diodes D3 and D4, surface mount capacitor EC3, and resistor R6. The temperature sensor... The circuit includes resistors R10 and R9 and integrated circuit P1. The buzzer circuit includes capacitor C3 and buzzer BUZ1. The interface circuit includes interface CN1. The display screen circuit includes SMG. The LED circuit includes interfaces COM1, COM2, COM3, and COM4, ​​LED1, LED2, LED3, LED4, LED8, LED9, LED10, LED11, LED12, LED13, LED14, and LEDs. The LEDs are LED15, LED16, LED17, LED18, LED19, LED20, LED21, LED22, LED23, LED24, LED25, LED26, LED27, and LED28. The main control circuit includes capacitors C1 and C6, surface mount capacitor EC1, inductor L1, and integrated circuit U1. The power distribution circuit includes control chip IC2, resistors R20, R8, and R7, and capacitor C2.

[0007] Preferably, pin 2 of transistor TR1 is connected to one end of cooling fan FAN1, pin 3 of transistor TR1 is connected to one end of resistor R7, pin 2 of transistor TR2 is connected to one end of indicator light LAMP, and pin 3 of transistor TR2 is connected to one end of resistor R14.

[0008] Preferably, pin 1 of transistor Q2 is connected to one end of resistor R16, pin 3 of transistor Q2 is connected to pin 3 of transistor Q3, pin 1 of transistor Q3 is connected to one end of resistor R19, the other ends of resistor R16 and resistor R19 are respectively connected to one end of resistor R18, one end of surface-mount capacitor EC4, and one end of diode D7, the other end of diode D7 is respectively connected to one end of diode D8 and one end of capacitor C4, the other end of capacitor C4 is connected to one end of resistor R20, pin 3 of transistor Q2 is connected to one end of socket J2, the other end of socket J2 is respectively connected to one end of diode D6 and pin 2 of relay RY1, the other end of diode D6 is connected to pin 1 of relay RY1, pin 3 of relay RY1 is connected to one end of heating element HEAT1, and pin 2 of transistor Q3, the other end of resistor R18, the other end of surface-mount capacitor EC4, and the other end of diode D8 are all grounded.

[0009] Preferably, pins 5, 6, 7, and 8 of the control chip IC1 are connected to one end of inductor L1 and one end of surface-mount capacitor EC2, respectively. The other end of inductor L1 is connected to one end of diode D2 and one end of surface-mount capacitor EC1, respectively. The other end of diode D2 is connected to one end of diode D1. The other end of diode D1 is connected to one end of zero-adjustment potentiometer RW1. The other end of zero-adjustment potentiometer RW1 is connected to one end of resistor R12, one end of resistor R2, one end of capacitor CX1, and one end of zinc oxide nonlinear resistor ZNR1, respectively. The other end of resistor R2 is connected to one end of resistor R5. The other ends of resistor R5, capacitor CX1, and zinc oxide nonlinear resistor ZNR1 are all connected to one end of fuse F1. The other end of resistor R12 is connected to one end of resistor R13, and the other end of resistor R13 is connected to... One end of diode D5, one end of resistor R15, and one end of transistor Q1 are connected. The surface of transistor Q1 is connected to one end of resistor R8 and one end of resistor R11, respectively. Pin 3 of control chip IC1 is connected to one end of resistor R1 and one end of resistor R3, respectively. The other end of resistor R1 is connected to one end of capacitor C1 and one end of capacitor C2, respectively. Pin 4 of control chip IC1 is connected to one end of resistor R4. Pin 2 of control chip IC1 is connected to the other ends of resistor R4, resistor R3, capacitor C1, capacitor C2, inductor L2, and diode D3, respectively. The other end of inductor L2 is connected to one end of diode D4, one end of surface-mount capacitor EC3, and one end of resistor R6, respectively. The other ends of diode D5, resistor R15, transistor Q1, diode D3, surface-mount capacitor EC3, and resistor R6 are all grounded.

[0010] Preferably, pins 2 of the integrated circuit P1 are connected to one end of resistor R10 and one end of resistor R9, pin 1 of the integrated circuit P1 is grounded, one end of the buzzer BUZ1 is connected to one end of capacitor C3, and the other end of the buzzer BUZ1 is grounded.

[0011] Preferably, one end of interface COM3 is connected to one end of LED22, one end of LED23, one end of LED24, one end of LED25, one end of LED26, one end of LED27, and one end of LED28, respectively; one end of interface COM2 is connected to one end of LED15, one end of LED16, one end of LED17, one end of LED18, one end of LED19, one end of LED20, and one end of LED21, respectively; one end of interface COM1 is connected to one end of LED8, one end of LED9, one end of LED10, one end of LED11, one end of LED12, one end of LED13, and one end of LED14, respectively; and one end of interface COM4 is connected to one end of LED1, one end of LED3, one end of LED2, and one end of LED4, respectively.

[0012] Preferably, pin 7 of the integrated circuit U1 is connected to one end of inductor L1 and one end of capacitor C1, the other end of inductor L1 is connected to one end of surface mount capacitor EC1 and one end of capacitor C6, and the other ends of surface mount capacitor EC1, capacitor C6, capacitor C1 and pin 3 of integrated circuit U1 are all grounded.

[0013] Preferably, pin 2 of the control chip IC2 is connected to one end of resistor R20, pin 3 of the control chip IC2 is connected to one end of resistor R8, pin 4 of the control chip IC2 is connected to one end of resistor R7, and one end of capacitor C2, pin 28 of control chip IC2, pin 25 of control chip IC2, and pin 22 of control chip IC2 are all grounded.

[0014] Compared with the prior art, the beneficial effects of this utility model are: by setting a temperature sensing circuit, a heating circuit and a heat dissipation circuit, the heating circuit processes the products in the air fryer, the temperature sensing circuit senses the processing temperature in the air fryer in real time, and when a high temperature error occurs, the cooling fan on the heat dissipation circuit turns on to dissipate heat from the air fryer, thus avoiding the phenomenon of product scorching and improving the processing efficiency of the air fryer. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the architecture of this utility model;

[0016] Figure 2 This is a circuit diagram of the heat dissipation circuit of this utility model;

[0017] Figure 3 This is a circuit diagram of the indicator light circuit of this utility model;

[0018] Figure 4 This is a circuit diagram of the heating circuit of this utility model;

[0019] Figure 5 This is a circuit diagram of the low-pressure control circuit of this utility model;

[0020] Figure 6 This is a circuit diagram of the temperature sensing circuit of this utility model;

[0021] Figure 7 This is the circuit diagram of the buzzer circuit of this utility model;

[0022] Figure 8 This is a circuit diagram of the interface circuit of this utility model;

[0023] Figure 9 This is a circuit diagram of the display screen circuit of this utility model;

[0024] Figure 10 This is the circuit diagram of the LED lamp circuit of this utility model;

[0025] Figure 11 This is a circuit diagram of the main control circuit of this utility model;

[0026] Figure 12 This is a circuit diagram of the power distribution circuit of this utility model. Detailed Implementation

[0027] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0028] Please see Figure 1-12This utility model provides a control circuit for an air fryer, including a heat dissipation circuit, an indicator light circuit, a heating circuit, a low-pressure control circuit, a temperature sensing circuit, a buzzer circuit, an interface circuit, a display screen circuit, an LED light circuit, a main control circuit, and a power distribution circuit. The heat dissipation circuit includes a cooling fan FAN1, a transistor TR1, and a resistor R7. The indicator light circuit includes a transistor TR2, an indicator light LAMP, and a resistor R14. The heating circuit includes a resistor R20, a capacitor C4, a diode D8, a diode D7, a surface-mount capacitor EC4, resistors R18, R19, and R16, a transistor Q3, a transistor Q2, and a diode D6. The components include socket J2, relay RY1, and heating element HEAT1. The low-pressure control circuit includes control chip IC1, inductor L1, surface mount capacitors EC1 and EC2, diodes D2 and D1, resistors R2 and R5, capacitor CX1, zinc oxide nonlinear resistor ZNR1, fuse F1, resistors R12 and R13, diode D5 and R15, transistor Q1, resistors R8 and R11, zero-adjustment potentiometer RW1, resistors R1, R3, and R4, capacitors C1 and C2, inductor L2, diodes D3 and D4, surface mount capacitor EC3, and resistor R6. The temperature sensing circuit includes... The circuit includes resistors R10 and R9, integrated circuit P1, a buzzer circuit including capacitor C3 and buzzer BUZ1, an interface circuit with interface CN1, a display circuit with SMG, and an LED circuit including interfaces COM1, COM2, COM3, and COM4, ​​and LEDs LED1, LED2, LED3, LED4, LED8, LED9, LED10, LED11, LED12, LED13, LED14, and LED LE. LED15, LED16, LED17, LED18, LED19, LED20, LED21, LED22, LED23, LED24, LED25, LED26, LED27, and LED28; the main control circuit includes capacitors C1 and C6, surface mount capacitor EC1, inductor L1, and integrated circuit U1; the power distribution circuit includes control chip IC2, resistors R20, R8, and R7, and capacitor C2.

[0029] Pin 2 of transistor TR1 is connected to one end of cooling fan FAN1, pin 3 of transistor TR1 is connected to one end of resistor R7, pin 2 of transistor TR2 is connected to one end of indicator light LAMP, and pin 3 of transistor TR2 is connected to one end of resistor R14.

[0030] One pin of transistor Q2 is connected to one end of resistor R16. One pin of transistor Q2 is connected to one pin of transistor Q3. One pin of transistor Q3 is connected to one end of resistor R19. The other ends of resistors R16 and R19 are connected to one end of resistor R18, one end of surface-mount capacitor EC4, and one end of diode D7, respectively. The other end of diode D7 is connected to one end of diode D8 and one end of capacitor C4, respectively. The other end of capacitor C4 is connected to one end of resistor R20. One pin of transistor Q2 is connected to one end of socket J2. The other end of socket J2 is connected to one end of diode D6 and one pin of relay RY1, respectively. The other end of diode D6 is connected to one pin of relay RY1. One pin of relay RY1 is connected to one end of heating element HEAT1. One pin of transistor Q3, the other end of resistor R18, the other end of surface-mount capacitor EC4, and the other end of diode D8 are all grounded.

[0031] Pins 5, 6, 7, and 8 of control chip IC1 are connected to one end of inductor L1 and one end of surface-mount capacitor EC2, respectively. The other end of inductor L1 is connected to one end of diode D2 and one end of surface-mount capacitor EC1, respectively. The other end of diode D2 is connected to one end of diode D1. The other end of diode D1 is connected to one end of zero-adjustment potentiometer RW1. The other end of zero-adjustment potentiometer RW1 is connected to one end of resistor R12, one end of resistor R2, one end of capacitor CX1, and one end of zinc oxide nonlinear resistor ZNR1, respectively. The other end of resistor R2 is connected to one end of resistor R5. The other ends of resistor R5, capacitor CX1, and zinc oxide nonlinear resistor ZNR1 are all connected to one end of fuse F1. The other end of resistor R12 is connected to one end of resistor R13. The other end of resistor R13 is connected to diode D2 and one end of surface-mount capacitor EC2 ... One end of resistor R5, one end of resistor R15, and one end of transistor Q1 are connected. The surface of transistor Q1 is connected to one end of resistor R8 and one end of resistor R11. Pin 3 of control chip IC1 is connected to one end of resistor R1 and one end of resistor R3. The other end of resistor R1 is connected to one end of capacitor C1 and one end of capacitor C2. Pin 4 of control chip IC1 is connected to one end of resistor R4. Pin 2 of control chip IC1 is connected to the other ends of resistor R4, resistor R3, capacitor C1, capacitor C2, inductor L2, and diode D3. The other end of inductor L2 is connected to one end of diode D4, one end of surface-mount capacitor EC3, and one end of resistor R6. The other ends of diode D5, resistor R15, transistor Q1, diode D3, surface-mount capacitor EC3, and resistor R6 are all grounded.

[0032] Pins 2 of integrated circuit P1 are connected to one end of resistor R10 and one end of resistor R9, respectively. Pin 1 of integrated circuit P1 is grounded. One end of buzzer BUZ1 is connected to one end of capacitor C3, and the other end of buzzer BUZ1 is grounded.

[0033] The advantages of interface COM3 are that it is connected to one end of LED22, LED23, LED24, LED25, LED26, LED27, and LED28 respectively. One end of interface COM2 is connected to one end of LED15, LED16, LED17, LED18, LED19, LED20, and LED21 respectively. One end of interface COM1 is connected to one end of LED8, LED9, LED10, LED11, LED12, LED13, and LED14 respectively. One end of interface COM4 is connected to one end of LED1, LED3, LED2, and LED4 respectively.

[0034] Pin 7 of integrated circuit U1 is connected to one end of inductor L1 and one end of capacitor C1, respectively. The other end of inductor L1 is connected to one end of surface mount capacitor EC1 and one end of capacitor C6, respectively. The other ends of surface mount capacitor EC1, capacitor C6, capacitor C1 and pin 3 of integrated circuit U1 are all grounded.

[0035] Pin 2 of control chip IC2 is connected to one end of resistor R20, pin 3 of control chip IC2 is connected to one end of resistor R8, pin 4 of control chip IC2 is connected to one end of resistor R7, and one end of capacitor C2, pin 28 of control chip IC2, pin 25 of control chip IC2, and pin 22 of control chip IC2 are all grounded.

[0036] In this embodiment, the heat dissipation circuit, through the coordinated operation of the fan and heating element, achieves hot air circulation, ensuring safe operation of the equipment and improving cooking efficiency. The indicator light circuit displays the working status, temperature setting, and timer reminders, typically achieved through indicator lights and a display screen. The heating circuit rapidly heats the air using a light wave heating tube or heating wire, while the built-in fan circulates the hot air around the food, forming a high-speed circulating heat flow. The low-pressure control circuit controls the on / off state of the control circuit to start / stop the equipment and provide protection. The temperature sensing circuit monitors the internal temperature of the air fryer in real time using an NTC temperature sensor, and adjusts the heating power in conjunction with the control circuit to ensure precise control of the cooking temperature. The buzzer circuit provides sound signals or alarms. The interface circuit enables power input, signal transmission, and equipment control functions. The display screen circuit displays the operating status of the air fryer. The power distribution circuit provides stable and reliable power support for the core components such as the motor and heating element within the equipment, ensuring normal operation of the equipment.

[0037] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A control circuit for an air fryer, comprising a heat dissipation circuit, an indicator light circuit, a heating circuit, a low-pressure control circuit, a temperature sensing circuit, a buzzer circuit, an interface circuit, a display screen circuit, an LED light circuit, a main control circuit, and a power distribution circuit, characterized in that: The heat dissipation circuit includes a cooling fan FAN1, a transistor TR1, and a resistor R7. The indicator light circuit includes a transistor TR2, an indicator light LAMP, and a resistor R14. The heating circuit includes a resistor R20, a capacitor C4, diodes D8 and D7, a surface-mount capacitor EC4, resistors R18, R19, and R16, transistors Q3 and Q2, a diode D6, a socket J2, a relay RY1, and a heating element HEAT1. The low-pressure control circuit includes a control chip IC1, an inductor L1, surface-mount capacitors EC1 and EC2, and a diode D2. The circuit includes diode D1, resistors R2 and R5, capacitor CX1, zinc oxide nonlinear resistor ZNR1, fuse F1, resistors R12 and R13, diode D5, resistor R15, transistor Q1, resistor R8, resistor R11, zero-adjustment potentiometer RW1, resistors R1, R3, and R4, capacitors C1 and C2, inductor L2, diodes D3 and D4, surface-mount capacitor EC3, and resistor R6. The temperature sensing circuit includes resistors R10 and R9 and integrated circuit P1. The buzzer circuit includes capacitor C3 and buzzer BUZ1. The interface circuit contains... The system includes an interface CN1, an SMG within the display circuit, and an LED circuit comprising interfaces COM1, COM2, COM3, and COM4, ​​and LEDs LED1, LED2, LED3, LED4, LED8, LED9, LED10, LED11, LED12, LED13, LED14, LED15, LED16, LED17, LED18, LED19, LED20, LED21, LED22, LED23, LED24, LED25, LED26, LED27, and LED28. The main control circuit includes capacitors C1 and C6, a surface-mount capacitor EC1, an inductor L1, and an integrated circuit U1. The power distribution circuit includes a control chip IC2, resistors R20, R8, and R7, and a capacitor C2.

2. The control circuit for an air fryer according to claim 1, characterized in that: The transistor TR1 has two pins connected to one end of the cooling fan FAN1, and three pins connected to one end of the resistor R7. The transistor TR2 has two pins connected to one end of the indicator light LAMP, and three pins connected to one end of the resistor R14.

3. The control circuit for an air fryer according to claim 1, characterized in that: One pin of transistor Q2 is connected to one end of resistor R16. One pin of transistor Q2 is connected to one pin of transistor Q3. One pin of transistor Q3 is connected to one end of resistor R19. The other ends of resistors R16 and R19 are connected to one end of resistor R18, one end of surface-mount capacitor EC4, and one end of diode D7, respectively. The other end of diode D7 is connected to one end of diode D8 and one end of capacitor C4, respectively. The other end of capacitor C4 is connected to one end of resistor R20. One pin of transistor Q2 is connected to one end of socket J2. The other end of socket J2 is connected to one end of diode D6 and one pin of relay RY1, respectively. The other end of diode D6 is connected to one pin of relay RY1. One pin of relay RY1 is connected to one end of heating element HEAT1. One pin of transistor Q3, the other end of resistor R18, the other end of surface-mount capacitor EC4, and the other end of diode D8 are all grounded.

4. The control circuit for an air fryer according to claim 1, characterized in that: Pins 5, 6, 7, and 8 of the control chip IC1 are respectively connected to one end of inductor L1 and one end of surface-mount capacitor EC2. The other end of inductor L1 is connected to one end of diode D2 and one end of surface-mount capacitor EC1. The other end of diode D2 is connected to one end of diode D1. The other end of diode D1 is connected to one end of zero-adjustment potentiometer RW1. The other end of zero-adjustment potentiometer RW1 is connected to one end of resistor R12, one end of resistor R2, one end of capacitor CX1, and one end of zinc oxide nonlinear resistor ZNR1. The other end of resistor R2 is connected to one end of resistor R5. The other ends of resistor R5, capacitor CX1, and zinc oxide nonlinear resistor ZNR1 are all connected to one end of fuse F1. The other end of resistor R12 is connected to one end of resistor R13. The other end of resistor R13 is connected to one end of diode... One end of transistor D5, one end of resistor R15, and one end of transistor Q1 are connected. The surface of transistor Q1 is connected to one end of resistor R8 and one end of resistor R11, respectively. Pin 3 of control chip IC1 is connected to one end of resistor R1 and one end of resistor R3, respectively. The other end of resistor R1 is connected to one end of capacitor C1 and one end of capacitor C2, respectively. Pin 4 of control chip IC1 is connected to one end of resistor R4. Pin 2 of control chip IC1 is connected to the other ends of resistor R4, resistor R3, capacitor C1, capacitor C2, inductor L2, and diode D3, respectively. The other end of inductor L2 is connected to one end of diode D4, one end of surface-mount capacitor EC3, and one end of resistor R6, respectively. The other ends of diode D5, resistor R15, transistor Q1, diode D3, surface-mount capacitor EC3, and resistor R6 are all grounded.

5. The control circuit for an air fryer according to claim 1, characterized in that: The two pins of the integrated circuit P1 are connected to one end of resistor R10 and one end of resistor R9, respectively. The one pin of the integrated circuit P1 is grounded. One end of the buzzer BUZ1 is connected to one end of capacitor C3, and the other end of the buzzer BUZ1 is grounded.

6. The control circuit for an air fryer according to claim 1, characterized in that: The advantages of interface COM3 are that it is connected to one end of LED22, LED23, LED24, LED25, LED26, LED27, and LED28 respectively. One end of interface COM2 is connected to one end of LED15, LED16, LED17, LED18, LED19, LED20, and LED21 respectively. One end of interface COM1 is connected to one end of LED8, LED9, LED10, LED11, LED12, LED13, and LED14 respectively. One end of interface COM4 is connected to one end of LED1, LED3, LED2, and LED4 respectively.

7. The control circuit for an air fryer according to claim 1, characterized in that: Pin 7 of the integrated circuit U1 is connected to one end of inductor L1 and one end of capacitor C1, respectively. The other end of inductor L1 is connected to one end of surface mount capacitor EC1 and one end of capacitor C6, respectively. The other ends of surface mount capacitor EC1, capacitor C6, capacitor C1 and pin 3 of integrated circuit U1 are all grounded.

8. The control circuit for an air fryer according to claim 1, characterized in that: Pin 2 of the control chip IC2 is connected to one end of resistor R20, pin 3 of the control chip IC2 is connected to one end of resistor R8, pin 4 of the control chip IC2 is connected to one end of resistor R7, and one end of capacitor C2, pin 28 of control chip IC2, pin 25 of control chip IC2, and pin 22 of control chip IC2 are all grounded.

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