Self-adaptive air conditioner circuit board

Abstract

The utility model relates to the technical field of air conditioner circuit boards, and discloses a self-adaptive air conditioner circuit board, which comprises a main control circuit; a power supply circuit; the sensor circuit comprises a three-in-one digital environment detection sensor; a motor driving circuit; a communication circuit; a power supply voltage rectification circuit; a zero cross detection circuit; the driving circuit is added between the indoor unit and the outdoor unit of the air conditioner, communication signals between the indoor unit and the outdoor unit are enhanced, external interference is resisted, and the N-line current loop communication circuit is adopted, so that the cost of signal transmission between the indoor unit and the outdoor unit can be greatly reduced; a three-in-one digital environment detection sensor is adopted, the temperature, humidity and air pressure of the indoor environment can be measured, after detected data are transmitted to a main control circuit, the main control circuit adjusts the working state of a compressor through a zero cross detection circuit and a motor driving circuit, and adjustment of the indoor temperature and humidity is achieved; therefore, the deviation between the indoor environment state and the target set by the user is within the allowable range, and the user feels more comfortable.

Description

Technical Field

[0001] The utility model relates to the technical field of air-conditioning circuit boards, in particular to a self-adaptive air-conditioning circuit board. Background Art

[0002] The air conditioning circuit board is a vital component in the air conditioning system. It is responsible for controlling various functions of the air conditioner, such as cooling, heating, wind speed adjustment, etc. The air conditioning circuit board receives signals from the remote control or control panel to control the working status of the air conditioner's compressor, fan, four-way valve and other components, thereby switching the air conditioning cooling, heating, air supply and other modes. The circuit board also has multiple protection functions such as overload protection, overheating protection, and undervoltage protection to ensure that the air conditioner can automatically shut down in abnormal situations to avoid damage.

[0003] After searching, the patent with application number CN202222005492.6 discloses a main control circuit board for a leakage-proof wall-mounted air conditioner, including a circuit board body, an external port is fixedly installed on the top of the circuit board body, a drying frame is arranged on one side of the external port, and the bottom of the drying frame is fixedly installed on the top of the circuit board body. The polypropylene film layer in the circuit board body has a strong moisture-proof effect, and the epoxy resin layer has a strong insulation protection and leakage-proof function. The desiccant box in the drying frame is an alkaline desiccant such as soda lime and quicklime, which absorbs moisture at noon, and the desiccant box can be replaced by rotating the adjusting knob to drive the threaded rod to be pulled out of the drying frame. The external wire is inserted into the external port, and the external wire is placed in the rectangular frame. The rectangular frame is rotated along the hinge seat, and the telescopic block is pulled out by the toggle plate at the same time. The telescopic block drives the limit buckle at the bottom to be clamped and fixed with the baffle at the top of the slot, and the supporting spring pulls the telescopic block to shrink.

[0004] The distance between the indoor and outdoor units of the current air-conditioning circuit board is far, and the external environment has a great interference on the signal transmission, resulting in the weakening of the communication signal between the two; and the current air-conditioning is not convenient for controlling the compressor to make corresponding adjustments according to the indoor environment, resulting in a large deviation between the air-conditioning outlet temperature and the user-set temperature, reducing the user experience. Therefore, we need to propose an adaptive air-conditioning circuit board. Utility Model Content

[0005] The purpose of the utility model is to provide an adaptive air-conditioning circuit board. Through the design of a communication circuit, a driving circuit is added between the indoor and outdoor units of the air-conditioning, the communication signal between the indoor and outdoor units is enhanced, and external interference is resisted. The N-line current loop communication circuit is adopted, which can greatly reduce the cost of signal transmission between the indoor and outdoor units; through the design of a sensor circuit, a three-in-one digital environment detection sensor is adopted to measure the temperature, humidity and air pressure of the indoor environment. After the detected data is transmitted to the main control circuit, the main control circuit adjusts the working state of the compressor through the zero-crossing detection circuit and the motor drive circuit to achieve the adjustment of the indoor temperature and humidity, so that the deviation between the indoor environment state and the user-set target is within the allowable range, making the user more comfortable, so as to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above purpose, the utility model provides the following technical solution: an adaptive air conditioning circuit board, comprising:

[0007] Main control circuit;

[0008] A power circuit that provides stable power to the circuit board;

[0009] A sensor circuit for monitoring the operating status of the air conditioner and environmental parameters, the sensor circuit includes a three-in-one digital environmental detection sensor;

[0010] A motor driving circuit for driving the fan;

[0011] A communication circuit for realizing communication between the indoor and outdoor units of the air conditioner;

[0012] A power supply voltage rectification circuit to prevent power supply short circuit;

[0013] A zero-crossing detection circuit for regulating the motor speed;

[0014] The power supply circuit, sensor circuit, motor drive circuit, communication circuit, power supply voltage rectification circuit, and zero-crossing detection circuit are all connected to the main control circuit, the zero-crossing detection circuit is electrically connected to the motor drive circuit, and the power supply circuit is electrically connected to the power supply voltage rectification circuit.

[0015] Preferably, the power supply circuit includes a varistor MOV1 connected to the L line and the N line, a transformer T1, and a rectifier bridge AB1, the varistor MOV1 is connected between pins 1 and 5 of the transformer T1, pin 6 of the transformer T1 is connected to pin 3 of the rectifier bridge AB1, pin 7 of the transformer T1 is connected to pin 1 of the rectifier bridge AB1, and pin 1 of the rectifier bridge AB1 is connected with a diode DV1, a diode DV3, a capacitor C1, and a capacitor C2 arranged in parallel.

[0016] Preferably, the sensor circuit includes a chip U44, a chip IC2, a terminal block J1, a MOS tube IC6, and a MOS tube IC7. A resistor R6 is connected between the G pole and the D pole of the MOS tube IC6, a resistor R4 is connected to the S pole of the MOS tube IC6, and the S pole of the MOS tube IC6 is connected to the 3rd pin of the terminal block J1, and the D pole of the MOS tube IC6 is connected to the 3rd pin of the chip IC2.

[0017] A resistor R5 is connected between the G pole and the D pole of the MOS tube IC7, a resistor R3 is connected to the S pole of the MOS tube IC7, the S pole of the MOS tube IC7 is connected to the 2nd pin of the terminal block J1, and the D pole of the MOS tube IC7 is connected to the 4th pin of the chip IC2.

[0018] Preferably, the motor driving circuit comprises a chip U3, a chip U4, a MOS transistor Q1, a MOS transistor Q2, a MOS transistor Q3, and a MOS transistor Q4, and a motor B1 is connected between pin 6 of the chip U3 and pin 6 of the chip U4;

[0019] Pin 3 of the MOS tube Q1 is connected to pin 2 of the MOS tube Q2, a resistor R9 is connected between pin 7 of the chip U3 and pin 1 of the MOS tube Q1, and a resistor R10 is connected between pin 5 of the chip U3 and pin 1 of the MOS tube Q2;

[0020] Pin 3 of the MOS tube Q3 is connected to pin 2 of the MOS tube Q4 , a resistor R11 is connected between pin 7 of the chip U4 and pin 1 of the MOS tube Q3 , and a resistor R12 is connected between pin 5 of the chip U4 and pin 1 of the MOS tube Q4 .

[0021] Preferably, the communication circuit includes an optocoupler IC9, an optocoupler IC10, a transistor Q9, and a terminal block CN16, wherein the 3rd pin of the optocoupler IC9 is connected to the 4th pin of the optocoupler IC10, a resistor R57 and a diode D21 are connected between the 4th pin of the optocoupler IC9 and the 1st pin of the terminal block CN16, and the 3rd pin of the optocoupler IC10 is respectively connected to a resistor R59 and a resistor R60 connected in series to the L line and a diode D22, a resistor R58 connected in parallel to the N line, a diode ZN1, a capacitor C30, and a capacitor E12;

[0022] Pin 2 of the optocoupler IC10 is connected to the collector of the transistor Q9 , a resistor R73 is connected between the base and emitter of the transistor Q9 , and a resistor R55 is connected to the base of the transistor Q9 .

[0023] Preferably, the power supply voltage rectification circuit includes a transformer T2, a terminal block CN1 and a terminal block CN2 connected at both ends of the transformer T2, and a chip IC1, wherein pin 1 of the terminal block CN1 is connected to the N line, and pin 2 of the terminal block CN1 is connected to a thermistor PTC1 connected to the L line, and between pins 1 and 3 of the terminal block CN2 are respectively connected a diode D17 and a diode D27 arranged in series and connected to pin 1 of the chip IC1, and a diode D37 and a diode D47 arranged in series and connected to pin 2 of the chip IC1, and between pins 1 and 2 of the chip IC1 are capacitors C11 and E11 connected in parallel.

[0024] Preferably, the zero-crossing detection circuit includes a transistor Q8, a capacitor C21, a resistor R41, and a resistor R39 arranged in parallel are connected between the base and the emitter of the transistor Q8, and a resistor R40 is connected between the resistor R41 and the resistor R39, and a diode D19 and a diode D20 are connected in parallel to the connection terminals of the resistor R39 and the resistor R40, a capacitor C222 is connected between the collector and the emitter of the transistor Q8, and a resistor R42 connected to 5V is connected to the collector of the transistor Q8.

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

[0026] 1. The utility model increases the driving circuit between the indoor and outdoor units of the air conditioner through the design of the communication circuit, strengthens the communication signal between the indoor and outdoor units, and resists external interference. The N-line current loop communication circuit is adopted, which can greatly reduce the cost of signal transmission between the indoor and outdoor units;

[0027] 2. The utility model adopts a three-in-one digital environment detection sensor through the design of the sensor circuit, which can measure the temperature, humidity and air pressure of the indoor environment. After the detected data is transmitted to the main control circuit, the main control circuit adjusts the working state of the compressor through the zero-crossing detection circuit and the motor drive circuit to achieve the adjustment of indoor temperature and humidity, so that the deviation between the indoor environment state and the user-set target is within the allowable range, making the user more comfortable. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A circuit diagram of the power supply circuit of the utility model;

[0029] Figure 2 A circuit diagram of the sensor circuit of the utility model;

[0030] Figure 3 The circuit diagram of the motor drive circuit of the utility model;

[0031] Figure 4 A circuit diagram of the communication circuit of the utility model;

[0032] Figure 5 It is a circuit diagram of the power supply voltage rectification circuit of the utility model;

[0033] Figure 6 It is a circuit diagram of the zero-crossing detection circuit of the utility model;

[0034] Figure 7 This is a circuit block diagram of the utility model. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0036] See also Figure 1-7 The utility model provides a technical solution: an adaptive air conditioning circuit board, comprising:

[0037] Main control circuit: The main control circuit receives and processes various operating instructions, such as power on / off, mode selection, temperature adjustment, etc., and automatically adjusts the working state of the air conditioner according to environmental parameters. The main control circuit includes:

[0038] Microprocessor (CPU): the core device of air conditioning control, completing detection and control functions;

[0039] Signal driving circuit: amplifies the CPU control signal to drive related functional circuits, such as compressors, fans, etc.

[0040] Remote control and display circuit: receives remote control signals and displays the working status of the air conditioner.

[0041] A power supply circuit that provides stable electrical energy to the circuit board; the power supply circuit includes functions such as voltage conversion and current stabilization to ensure that other circuits can work normally, and is used to convert the mains power into a DC voltage suitable for the circuit board to work.

[0042] The sensor circuit monitors the operating status of the air conditioner and environmental parameters. The sensor circuit includes a three-in-one digital environmental detection sensor; and transmits the measured information to the main control circuit.

[0043] The motor drive circuit drives the fan to rotate; it provides corresponding current and voltage according to the instructions of the main control circuit.

[0044] A communication circuit that enables communication between the indoor and outdoor units of the air conditioner so that the working state of the air conditioner can be automatically adjusted according to the needs of the entire system;

[0045] A power supply voltage rectification circuit to prevent power supply short circuit;

[0046] A zero-crossing detection circuit for regulating the motor speed;

[0047] It also includes protection circuits that monitor the working status of various circuits and actuators. Once an abnormality is detected (such as over-temperature, over-current, under-voltage, etc.), the protection mechanism will be triggered to avoid equipment damage and danger. The protection circuit includes but is not limited to over-temperature protectors, fuses, current detection circuits, etc.

[0048] Although the protection circuit itself does not directly participate in the adaptive regulation process, it provides necessary protection for adaptive regulation by monitoring and preventing circuit failures, overloads, etc. When an abnormal situation occurs in the system, the protection circuit will quickly cut off the relevant circuit or reduce the power output to prevent equipment damage and safety accidents.

[0049] The power supply circuit, sensor circuit, motor drive circuit, communication circuit, power supply voltage rectification circuit, and zero-crossing detection circuit are all connected to the main control circuit, the zero-crossing detection circuit is electrically connected to the motor drive circuit, and the power supply circuit is electrically connected to the power supply voltage rectification circuit.

[0050] The power supply circuit includes a varistor MOV1 connected to the L line and the N line, a transformer T1, and a rectifier bridge AB1. The varistor MOV1 is connected between pins 1 and 5 of the transformer T1, pin 6 of the transformer T1 is connected to pin 3 of the rectifier bridge AB1, pin 7 of the transformer T1 is connected to pin 1 of the rectifier bridge AB1, and pin 1 of the rectifier bridge AB1 is connected with a diode DV1, a diode DV3, a capacitor C1, and a capacitor C2 arranged in parallel.

[0051] A diode D2 is connected to the pin 10 of the transformer T1 , and a diode DV2 , a capacitor C3 , and a capacitor C4 which are arranged in parallel are connected between the pin 9 of the transformer T1 and one end of the diode D2 .

[0052] The sensor circuit includes a chip U44, a chip IC2, a terminal block J1, a MOS tube IC6, and a MOS tube IC7. A resistor R6 is connected between the G pole and the D pole of the MOS tube IC6, a resistor R4 is connected to the S pole of the MOS tube IC6, and the S pole of the MOS tube IC6 is connected to the 3rd pin of the terminal block J1, and the D pole of the MOS tube IC6 is connected to the 3rd pin of the chip IC2;

[0053] A resistor R5 is connected between the G pole and the D pole of the MOS tube IC7, a resistor R3 is connected to the S pole of the MOS tube IC7, the S pole of the MOS tube IC7 is connected to the 2nd pin of the terminal block J1, and the D pole of the MOS tube IC7 is connected to the 4th pin of the chip IC2.

[0054] The G pole of MOS tube IC6 and the G pole of MOS tube IC7 are both connected to pin 5 of chip U44, one end of resistor R4 and one end of resistor R3 are both connected to pin 1 of chip U44, capacitors C20 and C30 arranged in parallel are connected to pin 5 of chip U44, capacitor C10 is connected to pins 1 and 2 of chip U44; capacitor C40 connected to the ground is connected to the connection terminals of pins 6 and 8 of chip IC2, and switch S1 connected to the ground is connected to pin 5 of chip IC2.

[0055] The motor driving circuit includes a chip U3, a chip U4, a MOS tube Q1, a MOS tube Q2, a MOS tube Q3, and a MOS tube Q4. A motor B1 is connected between the 6th pin of the chip U3 and the 6th pin of the chip U4.

[0056] Pin 3 of the MOS tube Q1 is connected to pin 2 of the MOS tube Q2, a resistor R9 is connected between pin 7 of the chip U3 and pin 1 of the MOS tube Q1, and a resistor R10 is connected between pin 5 of the chip U3 and pin 1 of the MOS tube Q2;

[0057] Pin 3 of the MOS tube Q3 is connected to pin 2 of the MOS tube Q4 , a resistor R11 is connected between pin 7 of the chip U4 and pin 1 of the MOS tube Q3 , and a resistor R12 is connected between pin 5 of the chip U4 and pin 1 of the MOS tube Q4 .

[0058] A diode D28 is connected between pin 1 and pin 8 of chip U3, a capacitor C5 is connected between pin 6 and pin 8 of chip U3, and a capacitor C6 is connected between pin 3 and pin 4 of chip U3;

[0059] A diode D3 is connected between pin 1 and pin 8 of the chip U4, a capacitor C7 is connected between pin 6 and pin 8 of the chip U4, and a capacitor C8 is connected between pin 3 and pin 4 of the chip U4.

[0060] The communication circuit includes an optocoupler IC9, an optocoupler IC10, a transistor Q9, and a terminal block CN16. Pin 3 of the optocoupler IC9 is connected to pin 4 of the optocoupler IC10. A resistor R57 and a diode D21 are connected between pin 4 of the optocoupler IC9 and pin 1 of the terminal block CN16. Pin 3 of the optocoupler IC10 is respectively connected to a resistor R59 and a resistor R60 connected in series to the L line, and a diode D22, a resistor R58 connected in parallel to the N line, a diode ZN1, a capacitor C30, and a capacitor E12.

[0061] Pin 2 of the optocoupler IC10 is connected to the collector of the transistor Q9 , a resistor R73 is connected between the base and emitter of the transistor Q9 , and a resistor R55 is connected to the base of the transistor Q9 .

[0062] Pin 2 of the optocoupler IC9 is connected to a capacitor C25, a resistor R53, and a capacitor C26 which are arranged in parallel, and a resistor R52 is connected between the resistor R53 and the capacitor C26.

[0063] The power supply voltage rectification circuit includes a transformer T2, a terminal block CN1 and a terminal block CN2 connected at both ends of the transformer T2, and a chip IC1, wherein pin 1 of the terminal block CN1 is connected to the N line, and pin 2 of the terminal block CN1 is connected to the thermistor PTC1 connected to the L line, and between pins 1 and 3 of the terminal block CN2 are respectively connected a diode D17 and a diode D27 arranged in series and connected to pin 1 of the chip IC1, and a diode D37 and a diode D47 arranged in series and connected to pin 2 of the chip IC1, capacitors C11 and E11 are connected in parallel between pins 1 and 2 of the chip IC1, and capacitors E2 and C2 are connected in parallel between pins 2 and 3 of the chip IC1.

[0064] Diode D17, diode D27, diode D37 and diode D47 are rectifier diodes, model 1N4007, reverse withstand voltage value is 1000V, forward safety current is 1A, capacitor E11 and capacitor E2 are electrolytic capacitors, located at the back end of the power supply voltage rectification circuit, mainly play the role of filtering and voltage stabilization, the main parameters are rated voltage and capacitance, the voltage of the electrolytic capacitor must be designed with a derating, generally derating 50-70%.

[0065] Capacitors C11 and C2 block direct current and pass alternating current, and their main function is to filter out high-frequency interference signals and improve the cleanliness of the power supply.

[0066] Thermistor PTC1, whose internal resistance increases when the temperature rises, is used at the input end of the transformer to prevent the main control board power supply from being short-circuited or the input end power supply of transformer T2 from being wrong and burning transformer T2.

[0067] The zero-crossing detection circuit includes a transistor Q8, a capacitor C21, a resistor R41, and a resistor R39 arranged in parallel are connected between the base and the emitter of the transistor Q8, and a resistor R40 is connected between the resistor R41 and the resistor R39, and a diode D19 and a diode D20 are connected in parallel to the connection terminals of the resistor R39 and the resistor R40, a capacitor C222 is connected between the collector and the emitter of the transistor Q8, and a resistor R42 connected to 5V is connected to the collector of the transistor Q8.

[0068] One end of the diode D19 and one end of the diode D20 are connected to the secondary output end of the transformer T2 respectively. After half-wave rectification by the diode D19 and the diode D20 and switching control by the transistor Q8, a square wave is output at the ZERO end for judging the conduction angle of the motor drive and for adjusting the motor speed.

[0069] Resistors R39, R40 and R41 limit the current of transistor Q8 to reduce noise. Resistor R42 limits the collector current of transistor Q8 to prevent transistor Q8 from burning out due to excessive collector current.

[0070] Capacitor C21 and capacitor C222 block direct current and pass alternating current, and their main function is to filter out high-frequency interference signals and improve signal cleanliness.

[0071] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An adaptive air conditioning circuit board, characterized in that: include: Main control circuit; A power circuit that provides stable power to the circuit board; A sensor circuit for monitoring the operating status of the air conditioner and environmental parameters, the sensor circuit includes a three-in-one digital environmental detection sensor; A motor driving circuit for driving the fan; A communication circuit for realizing communication between the indoor and outdoor units of the air conditioner; A power supply voltage rectification circuit to prevent power supply short circuit; A zero-crossing detection circuit for regulating the motor speed; The power supply circuit, sensor circuit, motor drive circuit, communication circuit, power supply voltage rectification circuit, and zero-crossing detection circuit are all connected to the main control circuit, the zero-crossing detection circuit is electrically connected to the motor drive circuit, and the power supply circuit is electrically connected to the power supply voltage rectification circuit.

2. The adaptive air conditioning circuit board according to claim 1, characterized in that: The power supply circuit includes a varistor MOV1 connected to the L line and the N line, a transformer T1, and a rectifier bridge AB1. The varistor MOV1 is connected between pins 1 and 5 of the transformer T1, pin 6 of the transformer T1 is connected to pin 3 of the rectifier bridge AB1, pin 7 of the transformer T1 is connected to pin 1 of the rectifier bridge AB1, and pin 1 of the rectifier bridge AB1 is connected with a diode DV1, a diode DV3, a capacitor C1, and a capacitor C2 arranged in parallel.

3. The adaptive air conditioning circuit board according to claim 1, characterized in that: The sensor circuit includes a chip U44, a chip IC2, a terminal block J1, a MOS tube IC6, and a MOS tube IC7. A resistor R6 is connected between the G pole and the D pole of the MOS tube IC6, a resistor R4 is connected to the S pole of the MOS tube IC6, and the S pole of the MOS tube IC6 is connected to the 3rd pin of the terminal block J1, and the D pole of the MOS tube IC6 is connected to the 3rd pin of the chip IC2; A resistor R5 is connected between the G pole and the D pole of the MOS tube IC7, a resistor R3 is connected to the S pole of the MOS tube IC7, the S pole of the MOS tube IC7 is connected to the 2nd pin of the terminal block J1, and the D pole of the MOS tube IC7 is connected to the 4th pin of the chip IC2.

4. The adaptive air conditioning circuit board according to claim 1, characterized in that: The motor drive circuit includes a chip U3, a chip U4, a MOS tube Q1, a MOS tube Q2, a MOS tube Q3, and a MOS tube Q4. A motor B1 is connected between pin 6 of the chip U3 and pin 6 of the chip U4. Pin 3 of the MOS tube Q1 is connected to pin 2 of the MOS tube Q2, a resistor R9 is connected between pin 7 of the chip U3 and pin 1 of the MOS tube Q1, and a resistor R10 is connected between pin 5 of the chip U3 and pin 1 of the MOS tube Q2; Pin 3 of the MOS tube Q3 is connected to pin 2 of the MOS tube Q4 , a resistor R11 is connected between pin 7 of the chip U4 and pin 1 of the MOS tube Q3 , and a resistor R12 is connected between pin 5 of the chip U4 and pin 1 of the MOS tube Q4 .

5. The adaptive air conditioning circuit board according to claim 1, characterized in that: The communication circuit includes an optocoupler IC9, an optocoupler IC10, a transistor Q9, and a terminal block CN16. Pin 3 of the optocoupler IC9 is connected to pin 4 of the optocoupler IC10. A resistor R57 and a diode D21 are connected between pin 4 of the optocoupler IC9 and pin 1 of the terminal block CN16. Pin 3 of the optocoupler IC10 is respectively connected to a resistor R59 and a resistor R60 connected in series to the L line, and a diode D22, a resistor R58 connected in parallel to the N line, a diode ZN1, a capacitor C30, and a capacitor E12. Pin 2 of the optocoupler IC10 is connected to the collector of the transistor Q9 , a resistor R73 is connected between the base and emitter of the transistor Q9 , and a resistor R55 is connected to the base of the transistor Q9 .

6. The adaptive air conditioning circuit board according to claim 1, characterized in that: The power supply voltage rectification circuit includes a transformer T2, a terminal block CN1 and a terminal block CN2 connected at both ends of the transformer T2, and a chip IC1, wherein pin 1 of the terminal block CN1 is connected to the N line, and pin 2 of the terminal block CN1 is connected to a thermistor PTC1 connected to the L line, and between pins 1 and 3 of the terminal block CN2 are respectively connected a diode D17 and a diode D27 arranged in series and connected to pin 1 of the chip IC1, and a diode D37 and a diode D47 arranged in series and connected to pin 2 of the chip IC1, and between pins 1 and 2 of the chip IC1 are capacitors C11 and E11 connected in parallel.

7. The adaptive air conditioning circuit board according to claim 1, characterized in that: The zero-crossing detection circuit includes a transistor Q8, a capacitor C21, a resistor R41, and a resistor R39 arranged in parallel are connected between the base and the emitter of the transistor Q8, and a resistor R40 is connected between the resistor R41 and the resistor R39, and a diode D19 and a diode D20 are connected in parallel to the connection terminals of the resistor R39 and the resistor R40, a capacitor C222 is connected between the collector and the emitter of the transistor Q8, and a resistor R42 connected to 5V is connected to the collector of the transistor Q8.

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