Air conditioner after-sale detection system

Abstract

The invention relates to an after-sales detection system for an air conditioner. The after-sales detection system comprises a detection circuit, an isolation communication circuit, a non-isolation communication circuit, a current loop isolation communication circuit, an MCU circuit, a DC power supply circuit, a buzzer alarm circuit and a red light alarm circuit. The air conditioner after-sales detection system is composed of the above circuits, can detect the indoor unit board and parts in the air conditioner at the same time, has multiple detection items and strong expansibility, is convenient for after-sales maintenance personnel to quickly find air conditioner fault reasons, improves the air conditioner after-sales maintenance efficiency, and saves the air conditioner after-sales maintenance cost.

Description

Technical Field

[0001] The invention belongs to the technical field of air conditioner detection, and in particular relates to an air conditioner after-sales detection system. Background Art

[0002] Air conditioning, or air conditioner, refers to equipment that uses artificial means to adjust and control parameters such as temperature, humidity, and flow rate of the ambient air in a building or structure. Air conditioning has improved people's living standards and reduced the harm brought to people by the hot summer, allowing people to live in a suitable temperature. As our pace of life accelerates, we are increasingly dependent on the use of air conditioning. Regardless of spring, summer, autumn or winter, air conditioning has become an indispensable item in our lives. However, as the frequency of air conditioning use increases, the probability of air conditioning failure will increase.

[0003] However, the existing air conditioning inspection system has the following shortcomings: 1. It can only inspect the quality of the indoor and outdoor circuit boards at the same time, but cannot inspect the quality of the indoor circuit boards and components at the same time; 2. There are fewer inspection items and the scalability is not strong. In addition, the existing air conditioning inspection system is generally in the production line inspection and pre-sales inspection stage, rather than the after-sales inspection stage.

[0004] Therefore, the present invention provides an air conditioner after-sales detection system to solve the above technical problems. Summary of the invention

[0005] In view of the above problems, the object of the present invention is to provide an air conditioner after-sales inspection system, which has many inspection items, strong expandability, and high air conditioner after-sales maintenance efficiency.

[0006] The present invention provides an air conditioner after-sales detection system, comprising:

[0007] Detection circuit: used to detect whether the internal panels and components in the air conditioner are faulty;

[0008] Isolation communication circuit; used to isolate the detection circuit from the external human-machine interaction interface communication;

[0009] Non-isolated communication circuit: used to realize communication between the detection circuit and the tested internal board and tested components in the air conditioner;

[0010] Current loop isolation communication circuit: used to realize communication between the detection circuit and the internal board under test in the air conditioner;

[0011] MCU circuit: it is connected to the detection circuit, the isolated communication circuit, the non-isolated communication circuit and the current loop isolated communication circuit at the same time, and is used to send the fault data of the tested internal machine board and / or the tested components in the air conditioner to the external human-machine interaction interface for display;

[0012] A buzzer alarm circuit connected to the MCU circuit; when the detection circuit detects that the internal board and / or the tested component of the air conditioner is faulty, the MCU circuit controls the buzzer alarm circuit to emit a buzzer sound to remind after-sales maintenance personnel to perform repairs or replacements;

[0013] A red light alarm circuit connected to the MCU circuit; when the detection circuit detects that the internal board and / or the tested component in the air conditioner is faulty, the MCU circuit controls the red light alarm circuit to emit red light to remind after-sales maintenance personnel to repair or replace;

[0014] DC power supply circuit: it provides isolated power supply and non-isolated power supply to power the detection circuit, the isolated communication circuit, the non-isolated communication circuit, the current loop isolated communication circuit, the MCU circuit, the buzzer alarm circuit and the red light alarm circuit.

[0015] Preferably, the DC power supply circuit includes an isolated power supply circuit and a non-isolated power supply circuit; the isolated power supply circuit includes a first isolation circuit for providing a 12V isolated power supply, a second isolation circuit for providing a 5V isolated power supply and a chip U6 having 1-8 pins, the first isolation circuit includes an electrolytic capacitor E5 and a capacitor C56, the positive terminal of the electrolytic capacitor E5 is simultaneously connected to the first end of the capacitor C56 and the 2nd pin of the chip U6, and the negative terminal of the electrolytic capacitor E5 is simultaneously connected to the ground terminal, the second end of the capacitor C56 and the 1st pin of the chip U6; the second isolation circuit includes an electrolytic capacitor E6 and a capacitor C59, the positive terminal of the electrolytic capacitor E6 is simultaneously connected to the first end of the capacitor C59 and the 6th pin of the chip U6, and the negative terminal of the electrolytic capacitor E6 is simultaneously connected to the ground terminal, the second end of the capacitor C59 and the 7th pin of the chip U6;

[0016] The non-isolated power supply circuit includes a first non-isolated circuit for providing a 12V non-isolated power supply, a second non-isolated circuit for providing a 5V non-isolated power supply, and a chip U4 having 1-3 pins. The first non-isolated circuit includes a capacitor C51 and a capacitor C49. The first end of the capacitor C51 is simultaneously connected to the first end of the capacitor C49 and pin 1 of the chip U4, and the second end of the capacitor C51 is simultaneously connected to the second end of the capacitor C49, pin 2 of the chip U4, and the ground terminal; the second non-isolated circuit includes a capacitor C50, a capacitor C52, and a resistor R99. The first end of the capacitor C50 is simultaneously connected to the first end of the capacitor C52, the first end of the resistor R99, and pin 3 of the chip U4, and the second end of the capacitor C50 is simultaneously connected to the second end of the capacitor C52, the second end of the resistor R99, pin 2 of the chip U4, and the ground terminal.

[0017] Preferably, the MCU circuit includes a control chip with 1-64 pins, a first capacitor component and a second capacitor component, the first end of the first capacitor component is connected to pin 12 of the control chip, the second end of the first capacitor component is connected to the ground terminal, and the first end of the second capacitor component is simultaneously connected to pin 15 of the control chip and the 5V non-isolated power supply; wherein, the first capacitor component includes capacitor C105 and capacitor C104 arranged in parallel, and the second capacitor component includes capacitor C53 and electrolytic capacitor E3 arranged in parallel.

[0018] Preferably, the isolated communication circuit includes a first isolated communication circuit, a second isolated communication circuit and a communication terminal XS17 with a 1-4 interface; the first communication circuit includes a resistor R118, a resistor R121, a transistor Q3, a resistor R110, a first isolated high-speed communication optocoupler IC19 with a 1-6 interface, a capacitor C57, a resistor R114 and a resistor R119, the first end of the resistor R118 is connected to the 60 pin of the control chip, the second end of the resistor R118 is simultaneously connected to the first end of the resistor R121 and the base of the transistor Q3, and the second end of the resistor R121 is simultaneously connected to the emitter of the transistor Q3 and the ground terminal. , the collector of the transistor Q3 is connected to the 3 interface of the first isolated high-speed communication optocoupler IC19, the 1 interface of the first isolated high-speed communication optocoupler IC19 is connected to the first end of the resistor R110, the second end of the resistor R110 is connected to the 5V non-isolated power supply, the first end of the capacitor C57 is simultaneously connected to the 4-5 interface of the first isolated high-speed communication optocoupler IC19, the first end of the resistor R114, the first end of the resistor R119 and the ground terminal, the second end of the capacitor C57 is simultaneously connected to the second end of the resistor R114 and the 5V isolated power supply, and the resistor R119 is connected to the 3 interface of the communication terminal XS17;

[0019] The second communication circuit includes a capacitor C62, a resistor R130, a resistor R126, a capacitor C60, a second isolated high-speed communication optocoupler IC20 with a 1-6 interface, a resistor R124, a transistor Q4, a resistor R127 and a resistor R125, wherein a first end of the capacitor C62 is simultaneously connected to pin 59 of the control chip and a first end of the resistor R130, a second end of the capacitor C62 is simultaneously connected to a first end of the capacitor C60, a ground end and an interface 4 of the second isolated high-speed communication optocoupler IC20, a second end of the resistor R130 is simultaneously connected to a first end of the resistor R126, a second end of the capacitor C60 and an interface 5 of the second isolated high-speed communication optocoupler IC20, a second end of the resistor R126 is simultaneously connected to the 5V non-isolated power supply, the capacitor C60 The second end of is connected to the 6 interface of the second isolated high-speed communication optocoupler IC20, the 1 interface of the second isolated high-speed communication optocoupler IC20 is connected to the first end of the resistor R124, the second end of the resistor R124 is connected to the 5V isolated power supply, the 3 interface of the second isolated high-speed communication optocoupler IC20 is connected to the collector of the transistor Q4, the emitter of the transistor Q4 is simultaneously connected to the first end of the resistor R127 and the ground end, the base of the transistor Q4 is simultaneously connected to the second end of the resistor R127 and the first end of the resistor R125, the second end of the resistor R125 is connected to the 2 interface of the communication terminal XS17; the 4 interface of the communication terminal XS17 is connected to the ground end, and the 1 interface of the communication terminal XS17 is connected to the 5V isolated power supply.

[0020] Preferably, the non-isolated communication circuit includes a first non-isolated communication circuit and a second non-isolated communication circuit, the first non-isolated communication circuit includes a capacitor C47, a resistor R86, a resistor R92, a resistor R98, a resistor R90, a resistor R95, a resistor R100, a resistor R85, a resistor R101, a chip U5 with a 1-8 interface, a resistor R93, a resistor R96, a capacitor C48, an electrolytic capacitor E2, and a communication terminal XS10 with a 1-5 interface, and the first end of the capacitor C47 is simultaneously connected to the 7-pin of the control chip, the The first end of the resistor R86 is connected to the first end of the resistor R90, the second end of the capacitor C47 is connected to the ground, the second end of the resistor R86 is connected to the first end of the resistor R92, the first end of the resistor R98 and the 5V non-isolated power supply, the second end of the resistor R90 is connected to the first end of the resistor R85 and the 1 interface of the chip U5, the second end of the resistor R85 is connected to the 7 interface of the chip U5 and the first end of the resistor R93, the second end of the resistor R93 is connected to the capacitor C48 The first end of the capacitor C48 is connected to the negative end of the electrolytic capacitor E2, the 3-4 interface of the communication terminal XS10, the 5 interface of the chip U5 and the ground terminal. The second end of the capacitor C48 is connected to the 8 interface of the chip U5, the 5V non-isolated power supply, the positive end of the electrolytic capacitor E2 and the 2 interface of the communication terminal XS10. The second end of the resistor R92 is connected to the 9 pin of the control chip and the first end of the resistor R95. The second end of the resistor R95 is connected to the 2-3 interface of the chip U5. The second end of R98 is simultaneously connected to the 8th pin of the control chip and the first end of the resistor R100, the second end of the resistor R100 is simultaneously connected to the 4th interface of the chip U5 and the first end of the resistor R101, the second end of the resistor R101 is simultaneously connected to the 6th interface of the chip U5 and the first end of the resistor R96, the second end of the resistor R96 is simultaneously connected to the 5th interface of the communication terminal XS10 and the second end of the resistor R93, and the 1st interface of the communication terminal XS10 is connected to the 12V non-isolated power supply;

[0021] The second non-isolated communication circuit includes a communication terminal XS14 with a 1-4 interface, a resistor R104, a resistor R105, a resistor R107, a resistor R109, a capacitor C54, a diode DZ8 and a diode DZ7, wherein a first end of the resistor R107 is connected to pin 23 of the control chip, a second end of the resistor R107 is simultaneously connected to a first end of the resistor R105, a negative terminal of the diode DZ7, a first end of the capacitor C54 and a 2 interface of the communication terminal XS14, and a second end of the resistor R105 is simultaneously connected to pin 23 of the diode DZ7. The first end of the resistor R104, the 4 interface of the communication terminal XS14 and the 5V non-isolated power supply are connected, the positive end of the diode DZ7 is connected to the positive end of the diode DZ8 and the ground terminal, the second end of the capacitor C54 is connected to the ground terminal, the first end of the resistor R109 is connected to the 22 pin of the control chip, the second end of the resistor R109 is simultaneously connected to the negative end of the diode DZ8, the second end of the resistor R104 and the 1 interface of the communication terminal XS14, and the 3 interface of the communication terminal XS14 is connected to the ground terminal.

[0022] Preferably, the current loop isolation circuit includes a P1 terminal for receiving a zero line high voltage signal, a P2 terminal for receiving a low voltage signal, a resistor R61, a resistor R65, a capacitor C43, a diode D7, a thermistor PTC1, a diode D5, a resistor R63, a resistor R66, a diode D6, a capacitor C41, an optical coupler U1, an optical coupler U2, a resistor R64, a resistor R62, a resistor R67, a resistor R68, a resistor R70, a resistor R69, a capacitor C42 and a transistor Q2, and the P1 terminal is simultaneously connected to the first end of the resistor R61, the negative end of the diode D5, and the first end of the resistor R63. , the first end of the capacitor C41 is connected to the first end of the optical coupler U1, the second end of the resistor R61 is connected to the first end of the resistor R65, the second end of the resistor R65 is connected to the first end of the capacitor C43, the second end of the capacitor C43 is connected to the P2 end and the negative end of the diode D7, the positive end of the diode D7 is connected to the first end of the thermistor PTC1, the second end of the thermistor PTC1 is connected to the positive end of the diode D6, the first end of the resistor R66, the positive end of the diode D6 and the first end of the optical coupler U2, the The second end of the resistor R66 is simultaneously connected to the second end of the resistor R63, the negative terminal of the diode D6, the second end of the capacitor C41, the second end of the optocoupler U1, and the second end of the optocoupler U2. The third end of the optocoupler U1 is connected to the 5V non-isolated power supply. The fourth end of the optocoupler U1 is simultaneously connected to the first end of the resistor R64 and the first end of the resistor R62. The second end of the resistor R64 is connected to the ground terminal. The second end of the resistor R62 is simultaneously connected to the first end of the capacitor C42 and the 54th pin of the control chip. The second end of the capacitor C42 is connected to the ground terminal. The third end of the optical coupler U2 is connected to the first end of the resistor R68 and the first end of the resistor R67 at the same time, the second end of the resistor R67 is connected to the 5V non-isolated power supply, the second end of the resistor R68 is connected to the fourth end of the optical coupler U2 and the collector of the transistor Q2 at the same time, the emitter of the transistor Q2 is grounded, the base of the transistor Q2 is connected to the first end of the resistor R70, the second end of the resistor R70 is connected to the 55 pin of the control chip and the first end of the resistor R69 at the same time, and the second end of the resistor R69 is connected to the 5V non-isolated power supply.

[0023] Preferably, the detection circuit includes an AC internal fan detection circuit for detecting whether an AC fan in the air conditioner fails, a DC internal fan detection circuit for detecting whether a DC fan in the air conditioner fails, and a stepper motor detection circuit for detecting whether a stepper motor in the air conditioner fails.

[0024] Preferably, the AC internal fan detection circuit includes a first detection circuit and a speed feedback circuit, wherein the first detection circuit includes a detection terminal XS6 with a 1-3 interface, a resistor R42, a diode D3, a capacitor C31, a resistor R46, a diode D4, an optocoupler IC13, a resistor R48, a resistor R45 and a capacitor C32, a first end of the resistor R42 is connected to the 3 interface of the detection terminal XS6, a second end of the resistor R42 is connected to the positive end of the diode D3, a negative end of the diode D3 is simultaneously connected to the first end of the capacitor C31, the first end of the resistor R46, the negative end of the diode D4 and the first end of the optocoupler IC13, a second end of the capacitor C31, a second end of the resistor R46, the positive end of the diode D4 and The second end of the optocoupler IC13 is simultaneously connected to the 1 interface of the detection terminal XS6, the third end of the optocoupler IC13 is connected to the 5V non-isolated power supply, the fourth end of the optocoupler IC13 is simultaneously connected to the first end of the resistor R45 and the first end of the resistor R48, the second end of the resistor R45 is simultaneously connected to the first end of the capacitor C32 and the 51 pin of the control chip, and the second end of the resistor R48 is simultaneously connected to the second end of the capacitor C32 and the ground terminal; the speed feedback circuit includes a detection terminal CN1 with a 1-3 interface, the 1 interface of the detection terminal CN1 is connected to the ground terminal, the 2 interface of the detection terminal CN1 is connected to the 48 pin of the control chip, and the 3 interface of the detection terminal CN1 is connected to the 12V non-isolated power supply.

[0025] Preferably, the DC internal fan detection circuit includes a detection terminal XS1 with a 1-6 interface, a resistor R160, a resistor R161, a resistor R162, a resistor R164, an optical coupler U12, an optical coupler U13, an optical coupler U14, a resistor R12, a resistor R16, a diode D1, a capacitor C9, a resistor R163, a resistor R17, a capacitor C11, a diode D2, a resistor R23, a resistor R28, a resistor R32 and a transistor Q1, and the 1 interface of the detection terminal XS1 is connected to the first end of the resistor R160, the second end of the resistor R160 is connected to the first end of the optical coupler U12, and the second end of the optical coupler U12 is connected to the 5V non-isolated circuit The third end of the optical coupler U12 is connected to the first end of the resistor R16 and the first end of the resistor R12 at the same time, the second end of the resistor R16 is connected to the ground terminal and the first end of the capacitor C9 at the same time, the second end of the resistor R12 is connected to the positive terminal of the diode D1, the second end of the capacitor C9 and the 53 pin of the control chip at the same time, the negative terminal of the diode D1 is connected to the 5V non-isolated power supply, the 3 interface of the detection terminal XS1 is connected to the first end of the resistor R161, the first end of the resistor R162 and the first end of the resistor R164 at the same time, the second end of the resistor R161 is connected to the positive terminal of the optical coupler U12, the second end of the resistor R161 is connected to the positive terminal of the diode D1, the second end of the capacitor C9 and the 53 pin of the control chip at the same time, the negative terminal of the diode D1 is connected to the 5V non-isolated power supply, the 3 interface of the detection terminal XS1 is connected to the first end of the resistor R161, the first end of the resistor R162 and the first end of the resistor R164 at the same time, the second end of the resistor R161 is connected to the positive terminal of the optical coupler U12 The fourth end of the optical coupler U13 is connected to the second end of the resistor R162, the second end of the resistor R164 is connected to the fourth end of the optical coupler U14, the 5 interface of the detection terminal XS1 is connected to the first end of the optical coupler U13, the 6 interface of the detection terminal XS1 is connected to the first end of the optical coupler U14, the second end of the optical coupler U13 is simultaneously connected to the second end of the optical coupler U12 and the second end of the optical coupler U14, the third end of the optical coupler U13 is simultaneously connected to the first end of the resistor R17 and the first end of the resistor R163, the second end of the resistor R17 is simultaneously connected to the first end of the capacitor C11 and the first end of the diode The positive terminal of the transistor D2 is connected to the 56th pin of the control chip, the second end of the resistor R163 is connected to the second end of the capacitor C11 and the ground terminal at the same time, the negative terminal of the diode D2 is connected to the 5V non-isolated power supply, the third end of the optocoupler U14 is connected to the first end of the resistor R23, the second end of the resistor R23 is connected to the collector of the transistor Q1, the base of the transistor Q1 is connected to the first end of the resistor R28 and the first end of the resistor R32 at the same time, the emitter of the transistor Q1 is connected to the second end of the resistor R32 and the ground terminal at the same time, and the second end of the resistor R28 is connected to the 52nd pin of the control chip.

[0026] Preferably, the stepper motor detection circuit includes capacitor C5, resistor R9, resistor R15, optocoupler IC4, resistor R4, capacitor C4, detection terminal XS5 with 1-5 interface, capacitor C14, optocoupler IC8, resistor R21, resistor R27, resistor R31, capacitor C18, capacitor C26, optocoupler IC12, resistor R36, capacitor C22, resistor R41, resistor R47, capacitor C30, capacitor C36, optocoupler IC17, resistor R52, resistor R57, resistor R60 and capacitor C40, the first end of the capacitor C5 and the first end of the resistor R9 are simultaneously connected to pin 27 of the control chip, the second end of the capacitor C5 is connected to the ground terminal, and the second end of the resistor R9 is connected to the ground terminal. At the same time, it is connected to the first end of the resistor R15 and the first end of the optocoupler IC4, the second end of the resistor R15 is connected to the ground, the second end of the optocoupler IC4 is connected to the first end of the capacitor C4 and the 5V non-isolated power supply, the second end of the capacitor C4 is connected to the ground, the third end of the optocoupler IC4 is connected to the first end of the resistor R4, the second end of the resistor R4 is connected to the 12V non-isolated power supply, the fourth end of the optocoupler IC4 is connected to the 5 interface of the detection terminal XS5, the first end of the capacitor C18 and the first end of the resistor R27 are connected to the 26 pin of the control chip, the second end of the capacitor C18 is connected to the ground, and the second end of the resistor R27 is simultaneously connected to The first end of the optocoupler IC8 is connected to the first end of the resistor R31, the second end of the resistor R31 is connected to the ground, the second end of the optocoupler IC8 is connected to the first end of the capacitor C14 and the 5V non-isolated power supply at the same time, the second end of the capacitor C14 is connected to the ground, the third end of the optocoupler IC8 is connected to the first end of the resistor R21, the second end of the resistor R21 is connected to the 12V non-isolated power supply, the fourth end of the optocoupler IC8 is connected to the 4 interface of the detection terminal XS5, the first end of the capacitor C30 and the first end of the resistor R41 are connected to the 25 pin of the control chip at the same time, the second end of the capacitor C30 is connected to the ground, and the The second end is connected to the first end of the resistor R47 and the first end of the optocoupler IC12 at the same time, the second end of the resistor R47 is connected to the ground, the second end of the optocoupler IC12 is connected to the first end of the capacitor C26 and the 5V non-isolated power supply at the same time, the second end of the capacitor C26 is connected to the ground, the third end of the optocoupler IC12 is connected to the first end of the resistor R36, the second end of the resistor R36 is connected to the 12V non-isolated power supply, the fourth end of the optocoupler IC12 is connected to the 3 interface of the detection terminal XS5, the first end of the capacitor C40 and the first end of the resistor R257 are connected to the 24 pin of the control chip, and the second end of the capacitor C40 is connected to the ground.The second end of the resistor R57 is connected to the first end of the resistor R60 and the first end of the optocoupler IC17, the second end of the resistor R60 is connected to the ground, the second end of the optocoupler IC17 is connected to the first end of the capacitor C36 and the 5V non-isolated power supply, the second end of the capacitor C36 is connected to the ground, the third end of the optocoupler IC17 is connected to the first end of the resistor R52, the second end of the resistor R52 is connected to the 12V non-isolated power supply, the fourth end of the optocoupler IC17 is connected to the 2 interface of the detection terminal XS5, the 1 interface of the detection terminal XS5 is connected to the 12V non-isolated power supply and the first end of the capacitor 22, and the second end of the capacitor 22 is connected to the ground. ,

[0027] Preferably, the buzzer alarm circuit includes a resistor R280, a resistor R290, a transistor Q10, a resistor R270, a diode D20 and a buzzer BUZ1, the first end of the resistor R280 is connected to the control chip, the second end of the resistor R280 is simultaneously connected to the base of the transistor Q10 and the first end of the resistor R290, the second end of the resistor R290 is simultaneously connected to the ground terminal and the emitter of the transistor Q10, the collector of the transistor Q10 is simultaneously connected to the first end of the resistor R270, the positive end of the diode D20 and the first end of the buzzer BUZ1, and the second end of the resistor R270 is simultaneously connected to the negative end of the diode D20, the second end of the buzzer BUZ1 and the 5V non-isolated power supply.

[0028] Preferably, the red light alarm circuit includes a connection terminal CN2 with a 1-4 interface, a resistor R137 and an alarm indicator light LED1, the 4 interface of the connection terminal CN2 is connected to the first end of the resistor R137, the second end of the resistor R137 is connected to the positive end of the alarm indicator light LED1, and the negative end of the alarm indicator light LED1 is simultaneously connected to the 3 interface of the connection terminal CN2 and the ground end.

[0029] Compared with the related art, the present invention provides an air conditioner after-sales detection system, including a detection circuit for detecting whether the internal machine board and parts in the air conditioner are faulty, an isolated communication circuit for realizing the isolation of the detection circuit from the communication with the external human-machine interaction interface, a non-isolated communication circuit for realizing the communication between the detection circuit and the tested internal machine board and the tested parts in the air conditioner, a current loop isolated communication circuit for realizing the communication between the detection circuit and the tested internal machine board in the air conditioner, an MCU circuit connected to the detection circuit, the isolated communication circuit, the non-isolated communication circuit and the current loop isolated communication circuit at the same time, and a buzzer alarm circuit and a red light alarm circuit connected to the MCU circuit at the same time; wherein the MCU circuit is used to send the fault data of the tested internal machine board and / or the tested parts in the air conditioner to the external human-machine interaction interface for display. The above-mentioned structure can detect the internal machine board and parts in the air conditioner at the same time, and there are many detection items and strong scalability, which is convenient for after-sales maintenance personnel to quickly find the cause of the air conditioner failure, which not only improves the efficiency of air conditioner after-sales maintenance, but also saves the cost of air conditioner after-sales maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a structural schematic diagram of an air conditioner after-sales detection system of the present invention;

[0031] Figure 2 Schematic diagram of the circuit structure of the MCU circuit in the present invention;

[0032] Figure 3 It is a schematic diagram of the circuit structure of the isolated communication circuit in the present invention;

[0033] Figure 4 Schematic diagram of the circuit structure of the non-isolated communication circuit in the present invention;

[0034] Figure 5 It is a circuit structure schematic diagram of the current loop isolation communication circuit in the present invention;

[0035] Figure 6 Schematic diagram of the circuit structure of the DC power supply circuit in the present invention;

[0036] Figure 7 It is a circuit structure schematic diagram of the AC internal fan detection circuit in the present invention;

[0037] Figure 8 It is a circuit structure schematic diagram of the DC internal fan detection circuit in the present invention;

[0038] Fig. 9 Schematic diagram of the circuit structure of the stepping motor detection circuit in the present invention;

[0039] Fig.10 Schematic diagram of the circuit structure of the buzzer alarm circuit in the present invention;

[0040] Fig.11 It is a circuit structure schematic diagram of the red light alarm circuit in the present invention. DETAILED DESCRIPTION

[0041] The present invention provides an air conditioner after-sales detection system, aiming to solve the problems that the existing air conditioner detection system cannot detect the internal machine board and parts in the air conditioner at the same time, has few detection items and poor expansibility.

[0042] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] Please see attached Figure 1-11 As shown, the present invention provides an air conditioner after-sales detection system, which includes:

[0044] Detection circuit 1: used to detect whether the internal board and components in the air conditioner are faulty;

[0045] Isolation communication circuit 2; used to realize the communication isolation between the detection circuit 1 and the external human-machine interaction interface;

[0046] Non-isolated communication circuit 3: used to realize communication between the detection circuit 1 and the tested internal board and tested components in the air conditioner;

[0047] Current loop isolation communication circuit 4: used to realize communication between the detection circuit 1 and the internal board under test in the air conditioner;

[0048] MCU circuit 5: it is connected to the detection circuit 1, the isolated communication circuit 2, the non-isolated communication circuit 3 and the current loop isolated communication circuit 4 at the same time, and is used to send the fault data of the tested internal machine board and / or the tested components in the air conditioner to the external human-machine interaction interface for display;

[0049] A buzzer alarm circuit 6 is connected to the MCU circuit 5; when the detection circuit 1 detects that the internal board and / or the tested component of the air conditioner is faulty, the MCU circuit 5 controls the buzzer alarm circuit 6 to emit a buzzer sound to remind after-sales maintenance personnel to perform repairs or replacements;

[0050] The red light alarm circuit 7 is connected to the MCU circuit 5; when the detection circuit 1 detects that the internal board and / or the tested components in the air conditioner are faulty, the MCU circuit 5 controls the red light alarm circuit 7 to emit red light to remind after-sales maintenance personnel to perform repairs or replacements.

[0051] DC power supply circuit 8: it provides isolated power supply and non-isolated power supply to power the detection circuit 1, the isolated communication circuit 2, the non-isolated communication circuit 3, the current loop isolated communication circuit 4, the MCU circuit 5, the buzzer alarm circuit 6 and the red light alarm circuit 7.

[0052] Specifically, the DC power supply circuit 8 includes an isolated power supply circuit 81 and a non-isolated power supply circuit 82; the isolated power supply circuit 81 includes a first isolation circuit 811 for providing a 12V isolated power supply, a second isolation circuit 812 for providing a 5V isolated power supply, and a chip U6 having 1-8 pins, the first isolation circuit 811 includes an electrolytic capacitor E5 and a capacitor C56, the positive terminal of the electrolytic capacitor E5 is simultaneously connected to the first end of the capacitor C56 and the 2nd pin of the chip U6, and the negative terminal of the electrolytic capacitor E5 is simultaneously connected to the ground terminal, the second end of the capacitor C56 and the 1st pin of the chip U6; the second isolation circuit 812 includes an electrolytic capacitor E6 and a capacitor C59, the positive terminal of the electrolytic capacitor E6 is simultaneously connected to the first end of the capacitor C59 and the 6th pin of the chip U6, and the negative terminal of the electrolytic capacitor E6 is simultaneously connected to the ground terminal, the second end of the capacitor C59 and the 7th pin of the chip U6 The non-isolated power supply circuit 82 includes a first non-isolated circuit 821 for providing a 12V non-isolated power supply, a second non-isolated circuit 822 for providing a 5V non-isolated power supply, and a chip U4 having 1-3 pins, wherein the first non-isolated circuit 821 includes a capacitor C51 and a capacitor C49, wherein a first end of the capacitor C51 is simultaneously connected to a first end of the capacitor C49 and pin 1 of the chip U4, and a second end of the capacitor C51 is simultaneously connected to a second end of the capacitor C49, pin 2 of the chip U4, and a ground terminal; the second non-isolated circuit 822 includes a capacitor C50, a capacitor C52, and a resistor R99, wherein a first end of the capacitor C50 is simultaneously connected to a first end of the capacitor C52, a first end of the resistor R99, and pin 3 of the chip U4, and a second end of the capacitor C50 is simultaneously connected to a second end of the capacitor C52, a second end of the resistor R99, pin 2 of the chip U4, and a ground terminal.

[0053] The above-mentioned DC power supply circuit 8 is set up to supply power to the detection circuit 1, the isolated communication circuit 2, the non-isolated communication circuit 3, the current loop isolated communication circuit 4, the MCU circuit 5, the buzzer alarm circuit 6 and the red light alarm circuit 7. Due to the existence of the isolated communication circuit 2, the 12V power supply and the 5V power supply are isolated. The first non-isolated circuit 821 provides a 5V non-isolated power supply, and the second isolated circuit 812 provides a 5V isolated power supply. Then, components such as capacitor C50, capacitor C52, electrolytic capacitor E6, capacitor C59, etc. are used for DC power supply filtering to enhance the anti-interference ability of the 5V power supply.

[0054] In this embodiment, the MCU circuit 5 includes a control chip 51 with 1-64 pins, a first capacitor component 52 and a second capacitor component 53, wherein the first end of the first capacitor component 52 is connected to pin 51 of the control chip, the second end of the first capacitor component 52 is connected to the ground terminal, and the first end of the second capacitor component 53 is simultaneously connected to pin 15 of the control chip 51 and the 5V non-isolated power supply; wherein the first capacitor component 51 includes capacitors C105 and C104 arranged in parallel, and the second capacitor component 53 includes capacitors C53 and electrolytic capacitors E3 arranged in parallel.

[0055] Furthermore, the isolated communication circuit 2 includes a first isolated communication circuit 21, a second isolated communication circuit 22 and a communication terminal XS17 with a 1-4 interface; the first communication circuit 21 includes a resistor R118, a resistor R121, a transistor Q3, a resistor R110, a first isolated high-speed communication optocoupler IC19 with a 1-6 interface, a capacitor C57, a resistor R114 and a resistor R119, the first end of the resistor R118 is connected to the 60 pin of the control chip 51, the second end of the resistor R118 is simultaneously connected to the first end of the resistor R121 and the base of the transistor Q3, the second end of the resistor R121 is simultaneously connected to the emitter and the ground terminal of the transistor Q3, and the transistor The collector of the tube Q3 is connected to the 3 interface of the first isolated high-speed communication optocoupler IC19, the 1 interface of the first isolated high-speed communication optocoupler IC19 is connected to the first end of the resistor R110, the second end of the resistor R110 is connected to the 5V non-isolated power supply, the first end of the capacitor C57 is simultaneously connected to the 4-5 interface of the first isolated high-speed communication optocoupler IC19, the first end of the resistor R114, the first end of the resistor R119 and the ground terminal, the second end of the capacitor C57 is simultaneously connected to the second end of the resistor R114 and the 5V isolated power supply, and the resistor R119 is connected to the 3 interface of the communication terminal XS17; the second communication circuit 22 includes a capacitor C62, a capacitor C64, a capacitor C65, a capacitor C66, a capacitor C67, a capacitor C68, a capacitor C69, a capacitor C70, a capacitor C80, a capacitor C90, a capacitor C100, a capacitor C111, a capacitor C112, a capacitor C113, a capacitor C114, a capacitor C115, a capacitor C116, a capacitor C117, a capacitor C118, a capacitor C119, a capacitor C119, a capacitor C119, a capacitor C11 Resistor R130, resistor R126, capacitor C60, a second isolated high-speed communication optical coupler IC20 with a 1-6 interface, resistor R124, transistor Q4, resistor R127 and resistor R125, the first end of the capacitor C62 is simultaneously connected to the 59 pin of the control chip 51 and the first end of the resistor R130, the second end of the capacitor C62 is simultaneously connected to the first end of the capacitor C60, the ground end and the 4 interface of the second isolated high-speed communication optical coupler IC20, the second end of the resistor R130 is simultaneously connected to the first end of the resistor R126, the second end of the capacitor C60 and the 5 interface of the second isolated high-speed communication optical coupler IC20, the second end of the resistor R126 is simultaneously connected to the The 5V non-isolated power supply, the second end of the capacitor C60 are connected to the 6 interface of the second isolated high-speed communication optocoupler IC20, the 1 interface of the second isolated high-speed communication optocoupler IC20 is connected to the first end of the resistor R124, the second end of the resistor R124 is connected to the 5V isolated power supply, the 3 interface of the second isolated high-speed communication optocoupler IC20 is connected to the collector of the transistor Q4, the emitter of the transistor Q4 is simultaneously connected to the first end and the ground end of the resistor R127, the base of the transistor Q4 is simultaneously connected to the second end of the resistor R127 and the first end of the resistor R125, and the second end of the resistor R125 is connected to the 2 interface of the communication terminal XS17;The 4 interface of the communication terminal XS17 is connected to the ground terminal, and the 1 interface of the communication terminal XS17 is connected to the 5V isolated power supply. ;

[0056] The above-mentioned setting of the isolated communication circuit 2, the first isolated high-speed communication optocoupler IC19 and the second isolated high-speed communication optocoupler IC20 can perform 10M bit / s high-speed communication, ensuring the rapid transmission of a large amount of data. The external human-machine interaction interface is accessible to human hands and needs to be isolated from strong and weak electricity, so the isolated communication circuit 2 is designed, wherein the capacitor C60, the capacitor C57 and the capacitor C62 are used for communication signal filtering. The setting of this circuit ensures the safety of operation by after-sales maintenance personnel.

[0057] In this embodiment, the non-isolated communication circuit 3 includes a first non-isolated communication circuit 31 and a second non-isolated communication circuit 32, wherein the first non-isolated communication circuit 31 includes a capacitor C47, a resistor R86, a resistor R92, a resistor R98, a resistor R90, a resistor R95, a resistor R100, a resistor R85, a resistor R101, a chip U5 with a 1-8 interface, a resistor R93, a resistor R96, a capacitor C48, an electrolytic capacitor E2, and a communication terminal XS10 with a 1-5 interface, and the first end of the capacitor C47 is simultaneously connected to the control chip 51 The 7 pin of the chip U5, the first end of the resistor R86 and the first end of the resistor R90 are connected, the second end of the capacitor C47 is connected to the ground terminal, the second end of the resistor R86 is connected to the first end of the resistor R92, the first end of the resistor R98 and the 5V non-isolated power supply, the second end of the resistor R90 is connected to the first end of the resistor R85 and the 1 interface of the chip U5, the second end of the resistor R85 is connected to the 7 interface of the chip U5 and the first end of the resistor R93, and the second end of the resistor R93 is connected to the The first end of the capacitor C48, the negative end of the electrolytic capacitor E2, the 3-4 interface of the communication terminal XS10, the 5 interface of the chip U5 and the ground terminal are connected, the second end of the capacitor C48 is simultaneously connected to the 8 interface of the chip U5, the 5V non-isolated power supply, the positive end of the electrolytic capacitor E2 and the 2 interface of the communication terminal XS10, the second end of the resistor R92 is simultaneously connected to the 9 pin of the control chip and the first end of the resistor R95, the second end of the resistor R95 is connected to the 2-3 interface of the chip U5, and the resistor R95 is connected to the 2-3 interface of the chip U5. The second end of the resistor R98 is connected to the 8-pin of the control chip 51 and the first end of the resistor R100 at the same time, the second end of the resistor R100 is connected to the 4-port of the chip U5 and the first end of the resistor R101 at the same time, the second end of the resistor R101 is connected to the 6-port of the chip U5 and the first end of the resistor R96 at the same time, the second end of the resistor R96 is connected to the 5-port of the communication terminal XS10 and the second end of the resistor R93 at the same time, and the 1-port of the communication terminal XS10 is connected to the 12V non-isolated power supply;The second non-isolated communication circuit 32 includes a communication terminal XS14 with a 1-4 interface, a resistor R104, a resistor R105, a resistor R107, a resistor R109, a capacitor C54, a diode DZ8 and a diode DZ7, wherein the first end of the resistor R107 is connected to the 23 pin of the control chip 51, the second end of the resistor R107 is simultaneously connected to the first end of the resistor R105, the negative terminal of the diode DZ7, the first end of the capacitor C54 and the 2 interface of the communication terminal XS14, and the second end of the resistor R105 is simultaneously connected to the The first end of the resistor R104, the 4 interface of the communication terminal XS14 and the 5V non-isolated power supply are connected, the positive end of the diode DZ7 is connected to the positive end of the diode DZ8 and the ground end, the second end of the capacitor C54 is connected to the ground end, the first end of the resistor R109 is connected to the 22 pin of the control chip 51, the second end of the resistor R109 is simultaneously connected to the negative end of the diode DZ8, the second end of the resistor R104 and the 1 interface of the communication terminal XS14, and the 3 interface of the communication terminal XS14 is connected to the ground end. ;

[0058] The above-mentioned non-isolated communication circuit 3 is set up to realize the communication between the detection circuit 1 and the tested internal machine board and the tested parts in the air conditioner. Before power is turned on, human hands do not touch the electronic components, so there is no need for isolation design, which saves costs; the first non-isolated communication circuit 31 is a 485 communication circuit, in which the U5 chip is a 485 communication chip; the second non-isolated communication circuit 32 is a serial communication circuit; the electrolytic capacitor E2, the capacitor C47, the capacitor C48 and the capacitor C54 are used for communication signal filtering, and the resistor R107, the resistor R109, the diode DZ7 and the diode DZ8 are used to protect the control chip 51 in the MCU circuit to prevent current shock and static electricity from damaging the control chip 51.

[0059] Furthermore, the current loop isolation circuit 4 includes a P1 terminal for receiving a neutral line high voltage signal, a P2 terminal for receiving a low voltage signal, a resistor R61, a resistor R65, a capacitor C43, a diode D7, a thermistor PTC1, a diode D5, a resistor R63, a resistor R66, a diode D6, a capacitor C41, an optical coupler U1, an optical coupler U2, a resistor R64, a resistor R62, a resistor R67, a resistor R68, a resistor R70, a resistor R69, a capacitor C42 and a transistor Q2, and the P1 terminal is simultaneously connected to the first end of the resistor R61, the negative end of the diode D5, and the first end of the resistor R63. The first end of the capacitor C41 is connected to the first end of the optocoupler U1, the second end of the resistor R61 is connected to the first end of the resistor R65, the second end of the resistor R65 is connected to the first end of the capacitor C43, the second end of the capacitor C43 is connected to the P2 end and the negative end of the diode D7, the positive end of the diode D7 is connected to the first end of the thermistor PTC1, the second end of the thermistor PTC1 is connected to the positive end of the diode D6, the first end of the resistor R66, the positive end of the diode D6 and the first end of the optocoupler U2, the The second end of the resistor R66 is simultaneously connected to the second end of the resistor R63, the negative terminal of the diode D6, the second end of the capacitor C41, the second end of the optocoupler U1, and the second end of the optocoupler U2. The third end of the optocoupler U1 is connected to the 5V non-isolated power supply. The fourth end of the optocoupler U1 is simultaneously connected to the first end of the resistor R64 and the first end of the resistor R62. The second end of the resistor R64 is connected to the ground. The second end of the resistor R62 is simultaneously connected to the first end of the capacitor C42 and the 54th pin of the control chip 51. The second end of the capacitor C42 is connected to the ground. The first end of the optical coupler U2 is connected to the first end of the resistor R68 and the first end of the resistor R67 at the same time, the second end of the resistor R67 is connected to the 5V non-isolated power supply, the second end of the resistor R68 is connected to the fourth end of the optical coupler U2 and the collector of the transistor Q2 at the same time, the emitter of the transistor Q2 is grounded, the base of the transistor Q2 is connected to the first end of the resistor R70, the second end of the resistor R70 is connected to the 55 pin of the control chip and the first end of the resistor R69 at the same time, and the second end of the resistor R69 is connected to the 5V non-isolated power supply.

[0060] The above-mentioned current loop isolation circuit 4 is set up to realize the communication between the detection circuit and the tested internal machine board in the air conditioner, wherein components such as resistor R63, resistor R6, diode D5, diode D6, diode D7, thermistor PTC1, etc. convert the sinusoidal AC signal on the neutral line into a level, and then transmit it to the control chip 51 through components such as optocoupler U1, optocoupler U2, transistor Q2, etc.

[0061] In this embodiment, the detection circuit 1 includes an AC internal fan detection circuit 11 for detecting whether an AC fan in the air conditioner is faulty, a DC internal fan detection circuit 12 for detecting whether a DC fan in the air conditioner is faulty, and a stepper motor detection circuit 13 for detecting whether a stepper motor in the air conditioner is faulty.

[0062] Wherein: the AC internal fan detection circuit 11 includes a first detection circuit 111 and a speed feedback circuit 112, wherein the first detection circuit includes a detection terminal XS6 with a 1-3 interface, a resistor R42, a diode D3, a capacitor C31, a resistor R46, a diode D4, an optocoupler IC13, a resistor R48, a resistor R45 and a capacitor C32, the first end of the resistor R42 is connected to the 3 interface of the detection terminal XS6, the second end of the resistor R42 is connected to the positive terminal of the diode D3, the negative terminal of the diode D3 is simultaneously connected to the first end of the capacitor C31, the first end of the resistor R46, the negative terminal of the diode D4 and the first end of the optocoupler IC13, the second end of the capacitor C31, the second end of the resistor R46, the positive terminal of the diode D4 The first end and the second end of the optocoupler IC13 are simultaneously connected to the 1 interface of the detection terminal XS6, the third end of the optocoupler IC13 is connected to the 5V non-isolated power supply, the fourth end of the optocoupler IC13 is simultaneously connected to the first end of the resistor R45 and the first end of the resistor R48, the second end of the resistor R45 is simultaneously connected to the first end of the capacitor C32 and the 51 pin of the control chip 51, and the second end of the resistor R48 is simultaneously connected to the second end of the capacitor C32 and the ground terminal; the speed feedback circuit includes a detection terminal CN1 with a 1-3 interface, the 1 interface of the detection terminal CN1 is connected to the ground terminal, the 2 interface of the detection terminal CN1 is connected to the 48 pin of the control chip 51, and the 3 interface of the detection terminal CN1 is connected to the 12V non-isolated power supply.

[0063] In the above structure, the AC internal fan detection circuit 11 is used to detect the quality of the AC fan in the aftermarket air conditioner. When the AC fan is connected to the 220V power supply, if the AC fan is not faulty, it will output a normal signal to the control chip 51 after passing through the resistor R42, the resistor R46, the diode D3, the diode D4 and the optocoupler IC13 and other components; when the AC fan is connected to the 220V power supply, if the AC fan has failed, it will output an abnormal signal to the control chip 51 after passing through the resistor R42, the resistor R46, the diode D3, the diode D4 and the optocoupler IC13, so as to determine whether the AC fan has failed and whether it can continue to be used.

[0064] The DC internal fan detection circuit 12 includes a detection terminal XS1 with a 1-6 interface, a resistor R160, a resistor R161, a resistor R162, a resistor R164, an optical coupler U12, an optical coupler U13, an optical coupler U14, a resistor R12, a resistor R16, a diode D1, a capacitor C9, a resistor R163, a resistor R17, a capacitor C11, a diode D2, a resistor R23, a resistor R28, a resistor R32 and a transistor Q1, wherein the 1 interface of the detection terminal XS1 is connected to the first end of the resistor R160, the second end of the resistor R160 is connected to the first end of the optical coupler U12, and the second end of the optical coupler U12 is connected to the 5V non-isolated power supply , the third end of the optical coupler U12 is simultaneously connected to the first end of the resistor R16 and the first end of the resistor R12, the second end of the resistor R16 is simultaneously connected to the ground terminal and the first end of the capacitor C9, the second end of the resistor R12 is simultaneously connected to the positive terminal of the diode D1, the second end of the capacitor C9 and the 53 pin of the control chip 51, the negative terminal of the diode D1 is connected to the 5V non-isolated power supply, the 3 interface of the detection terminal XS1 is simultaneously connected to the first end of the resistor R161, the first end of the resistor R162 and the first end of the resistor R164, the second end of the resistor R161 is simultaneously connected to the fourth end of the optical coupler U12 The first end of the optical coupler U12 is connected to the second end of the optical coupler U14, the second end of the resistor R162 is connected to the fourth end of the optical coupler U13, the second end of the resistor R164 is connected to the fourth end of the optical coupler U14, the 5th interface of the detection terminal XS1 is connected to the first end of the optical coupler U13, the 6th interface of the detection terminal XS1 is connected to the first end of the optical coupler U14, the second end of the optical coupler U13 is simultaneously connected to the second end of the optical coupler U12 and the second end of the optical coupler U14, the third end of the optical coupler U13 is simultaneously connected to the first end of the resistor R17 and the first end of the resistor R163, the second end of the resistor R17 is simultaneously connected to the first end of the capacitor C11 and the diode D2 The positive terminal of the transistor Q1 is connected to the 56th pin of the control chip 51, the second end of the resistor R163 is connected to the second end of the capacitor C11 and the ground terminal at the same time, the negative terminal of the diode D2 is connected to the 5V non-isolated power supply, the third end of the optocoupler U14 is connected to the first end of the resistor R23, the second end of the resistor R23 is connected to the collector of the transistor Q1, the base of the transistor Q1 is connected to the first end of the resistor R28 and the first end of the resistor R32 at the same time, the emitter of the transistor Q1 is connected to the second end of the resistor R32 and the ground terminal at the same time, and the second end of the resistor R28 is connected to the 52nd pin of the control chip 51;

[0065] In the above structure, the DC internal fan detection circuit 12 is used to detect the quality of the DC fan in the after-sales air conditioner. When the DC fan is connected to the power supply, if the DC fan is not faulty, it will output a normal signal to the control chip 51 after passing through components such as resistor R160, resistor R161, resistor R162, resistor R164, optocoupler U12, optocoupler U13 and optocoupler U14. When the DC fan is connected to the power supply, if the DC fan has failed, it will output an abnormal signal to the control chip 51 after passing through components such as resistor R160, resistor R161, resistor R162, resistor R164, optocoupler U12, optocoupler U13 and optocoupler U14, so as to determine whether the DC fan is faulty and whether it can continue to be used.

[0066] The stepper motor detection circuit 13 includes a capacitor C5, a resistor R9, a resistor R15, an optical coupler IC4, a resistor R4, a capacitor C4, a detection terminal XS5 with a 1-5 interface, a capacitor C14, an optical coupler IC8, a resistor R21, a resistor R27, a resistor R31, a capacitor C18, a capacitor C26, an optical coupler IC12, a resistor R36, a capacitor C22, a resistor R41, a resistor R47, a capacitor C30, a capacitor C36, an optical coupler IC17, a resistor R52, a resistor R57, a resistor R60 and a capacitor C40. The first end of the capacitor C5 and the first end of the resistor R9 are simultaneously connected to the 27 pin of the control chip 51, the second end of the capacitor C5 is connected to the ground terminal, and the second end of the resistor R9 is simultaneously connected to the ground terminal. The first end of the resistor R15 is connected to the first end of the optical coupler IC4, the second end of the resistor R15 is connected to the ground, the second end of the optical coupler IC4 is connected to the first end of the capacitor C4 and the 5V non-isolated power supply, the second end of the capacitor C4 is connected to the ground, the third end of the optical coupler IC4 is connected to the first end of the resistor R4, the second end of the resistor R4 is connected to the 12V non-isolated power supply, the fourth end of the optical coupler IC4 is connected to the 5 interface of the detection terminal XS5, the first end of the capacitor C18 and the first end of the resistor R27 are connected to the 26 pin of the control chip 51, the second end of the capacitor C18 is connected to the ground, and the second end of the resistor R27 is connected to the detection terminal XS5 at the same time. The first end of the optocoupler IC8 is connected to the first end of the resistor R31, the second end of the resistor R31 is connected to the ground, the second end of the optocoupler IC8 is connected to the first end of the capacitor C14 and the 5V non-isolated power supply at the same time, the second end of the capacitor C14 is connected to the ground, the third end of the optocoupler IC8 is connected to the first end of the resistor R21, the second end of the resistor R21 is connected to the 12V non-isolated power supply, the fourth end of the optocoupler IC8 is connected to the 4 interface of the detection terminal XS5, the first end of the capacitor C30 and the first end of the resistor R41 are connected to the 25 pin of the control chip 51 at the same time, the second end of the capacitor C30 is connected to the ground, the first end of the resistor R41 is connected to the 25 pin of the control chip 51 at the same time, the second end of the capacitor C30 is connected to the ground, and the third end of the resistor R41 is connected to the first end of the resistor R21. The two ends are simultaneously connected to the first end of the resistor R47 and the first end of the optocoupler IC12, the second end of the resistor R47 is connected to the ground, the second end of the optocoupler IC12 is simultaneously connected to the first end of the capacitor C26 and the 5V non-isolated power supply, the second end of the capacitor C26 is connected to the ground, the third end of the optocoupler IC12 is connected to the first end of the resistor R36, the second end of the resistor R36 is connected to the 12V non-isolated power supply, the fourth end of the optocoupler IC12 is connected to the 3 interface of the detection terminal XS5, the first end of the capacitor C40 and the first end of the resistor R257 are connected to the 24 pin of the control chip 51, and the second end of the capacitor C40 is connected to the ground.The second end of the resistor R57 is connected to the first end of the resistor R60 and the first end of the optocoupler IC17, the second end of the resistor R60 is connected to the ground, the second end of the optocoupler IC17 is connected to the first end of the capacitor C36 and the 5V non-isolated power supply, the second end of the capacitor C36 is connected to the ground, the third end of the optocoupler IC17 is connected to the first end of the resistor R52, the second end of the resistor R52 is connected to the 12V non-isolated power supply, the fourth end of the optocoupler IC17 is connected to the 2 interface of the detection terminal XS5, the 1 interface of the detection terminal XS5 is connected to the 12V non-isolated power supply and the first end of the capacitor 22, and the second end of the capacitor 22 is connected to the ground. ,

[0067] In the above structure, the stepper motor detection circuit 13 is used to detect the quality of the stepper motor in the aftermarket air conditioner. When the stepper motor is powered on, if the stepper motor is not faulty, a normal signal will be output to the control chip 51 after passing through the resistor R9, the resistor R27, the resistor R41, the resistor R57, the optical coupler IC4, the optical coupler IC8, the optical coupler IC12 and the optical coupler IC17 and other components. When the stepper motor is powered on, if the stepper motor has failed, an abnormal signal will be output to the control chip 51 after passing through the resistor R9, the resistor R27, the resistor R41, the resistor R57, the optical coupler IC4, the optical coupler IC8, the optical coupler IC12 and the optical coupler IC17 and other components, so as to determine whether the stepper motor has failed and whether it can continue to be used.

[0068] It is worth mentioning that the buzzer alarm circuit 6 includes a resistor R280, a resistor R290, a transistor Q10, a resistor R270, a diode D20 and a buzzer BUZ1. The first end of the resistor R280 is connected to the control chip, the second end of the resistor R280 is connected to the base of the transistor Q10 and the first end of the resistor R290 at the same time, the second end of the resistor R290 is connected to the ground terminal and the emitter of the transistor Q10 at the same time, the collector of the transistor Q10 is connected to the first end of the resistor R270, the positive end of the diode D20 and the first end of the buzzer BUZ1 at the same time, and the second end of the resistor R270 is connected to the negative end of the diode D20, the second end of the buzzer BUZ1 and the 5V non-isolated power supply at the same time. With this structural setting, the control chip 51 can directly control the buzzer BUZ1. When it is detected that the internal board and components under test are faulty or damaged, the control chip 51 can control the buzzer BZ1 to emit a buzzing sound to remind after-sales maintenance personnel that the air conditioner is in a faulty state and needs to be repaired or replaced.

[0069] In this embodiment, the red light alarm circuit 7 includes a connection terminal CN2 with a 1-4 interface, a resistor R137 and an alarm indicator LED1. The 4 interface of the connection terminal CN2 is connected to the first end of the resistor R137, the second end of the resistor R137 is connected to the positive end of the alarm indicator LED1, and the negative end of the alarm indicator LED1 is simultaneously connected to the 3 interface of the connection terminal CN2 and the ground terminal. With this structural setting, the control chip 51 can directly control the on and off of the alarm indicator LED1. When it is detected that the internal board and components under test are faulty or damaged, it reminds the after-sales maintenance personnel that the air conditioner is in a faulty state and needs to be repaired or replaced. The LED light can also be used to indicate different working modes, giving after-sales maintenance personnel a more intuitive operating experience.

[0070] In addition, it should be noted that the air conditioner after-sales inspection system provided by the present invention can be made into a small size and is easy to carry. It can be used for special inspection and analysis at after-sales service outlets, and can also be used for on-site repairs by after-sales maintenance personnel, which is convenient, fast, and saves time and effort.

[0071] Compared with the related art, the present invention provides an air conditioner after-sales detection system, including a detection circuit for detecting whether the internal machine board and parts in the air conditioner are faulty, an isolated communication circuit for realizing the isolation of the detection circuit from the communication with the external human-machine interaction interface, a non-isolated communication circuit for realizing the communication between the detection circuit and the tested internal machine board and the tested parts in the air conditioner, a current loop isolated communication circuit for realizing the communication between the detection circuit and the tested internal machine board in the air conditioner, an MCU circuit connected to the detection circuit, the isolated communication circuit, the non-isolated communication circuit and the current loop isolated communication circuit at the same time, and a buzzer alarm circuit and a red light alarm circuit connected to the MCU circuit at the same time; wherein the MCU circuit is used to send the fault data of the tested internal machine board and / or the tested parts in the air conditioner to the external human-machine interaction interface for display. The above-mentioned structure can detect the internal machine board and parts in the air conditioner at the same time, and there are many detection items and strong scalability, which is convenient for after-sales maintenance personnel to quickly find the cause of the air conditioner failure, which not only improves the efficiency of air conditioner after-sales maintenance, but also saves the cost of air conditioner after-sales maintenance.

[0072] It should be noted that the above-described embodiments should be understood as illustrative rather than limiting the scope of protection of the present invention, and the scope of protection of the present invention shall be subject to the claims. For those skilled in the art, some non-essential improvements and adjustments made to the present invention still fall within the scope of protection of the present invention without departing from the essence and scope of the present invention.

Claims

1. An air conditioner after-sales detection system, characterized in that: The air conditioner after-sales detection system comprises: Detection circuit: used to detect whether the internal panels and components in the air conditioner are faulty; Isolation communication circuit; used to isolate the detection circuit from the external human-machine interaction interface communication; Non-isolated communication circuit: used to realize communication between the detection circuit and the tested internal board and tested components in the air conditioner; Current loop isolation communication circuit: used to realize communication between the detection circuit and the internal board under test in the air conditioner; MCU circuit: it is connected to the detection circuit, the isolated communication circuit, the non-isolated communication circuit and the current loop isolated communication circuit at the same time, and is used to send the fault data of the tested internal machine board and / or the tested components in the air conditioner to the external human-machine interaction interface for display; A buzzer alarm circuit connected to the MCU circuit; when the detection circuit detects that the internal board and / or the tested component of the air conditioner is faulty, the MCU circuit controls the buzzer alarm circuit to emit a buzzer sound to remind after-sales maintenance personnel to perform repairs or replacements; A red light alarm circuit connected to the MCU circuit; when the detection circuit detects that the internal board and / or the tested component in the air conditioner is faulty, the MCU circuit controls the red light alarm circuit to emit red light to remind after-sales maintenance personnel to repair or replace; DC power supply circuit: it provides isolated power supply and non-isolated power supply to power the detection circuit, the isolated communication circuit, the non-isolated communication circuit, the current loop isolated communication circuit, the MCU circuit, the buzzer alarm circuit and the red light alarm circuit.

2. An air conditioner after-sales detection system according to claim 1, characterized in that: The DC power supply circuit includes an isolated power supply circuit and a non-isolated power supply circuit; the isolated power supply circuit includes a first isolation circuit for providing a 12V isolated power supply, a second isolation circuit for providing a 5V isolated power supply and a chip U6 with 1-8 pins, the first isolation circuit includes an electrolytic capacitor E5 and a capacitor C56, the positive terminal of the electrolytic capacitor E5 is simultaneously connected to the first end of the capacitor C56 and the 2nd pin of the chip U6, and the negative terminal of the electrolytic capacitor E5 is simultaneously connected to the ground terminal, the second end of the capacitor C56 and the 1st pin of the chip U6; the second isolation circuit includes an electrolytic capacitor E6 and a capacitor C59, the positive terminal of the electrolytic capacitor E6 is simultaneously connected to the first end of the capacitor C59 and the 6th pin of the chip U6, and the negative terminal of the electrolytic capacitor E6 is simultaneously connected to the ground terminal, the second end of the capacitor C59 and the 7th pin of the chip U6; The non-isolated power supply circuit includes a first non-isolated circuit for providing a 12V non-isolated power supply, a second non-isolated circuit for providing a 5V non-isolated power supply, and a chip U4 having 1-3 pins. The first non-isolated circuit includes a capacitor C51 and a capacitor C49. The first end of the capacitor C51 is simultaneously connected to the first end of the capacitor C49 and pin 1 of the chip U4, and the second end of the capacitor C51 is simultaneously connected to the second end of the capacitor C49, pin 2 of the chip U4, and the ground terminal; the second non-isolated circuit includes a capacitor C50, a capacitor C52, and a resistor R99. The first end of the capacitor C50 is simultaneously connected to the first end of the capacitor C52, the first end of the resistor R99, and pin 3 of the chip U4, and the second end of the capacitor C50 is simultaneously connected to the second end of the capacitor C52, the second end of the resistor R99, pin 2 of the chip U4, and the ground terminal.

3. An air conditioner after-sales detection system according to claim 2, characterized in that: The MCU circuit includes a control chip with 1-64 pins, a first capacitor component and a second capacitor component, wherein the first end of the first capacitor component is connected to pin 12 of the control chip, the second end of the first capacitor component is connected to the ground terminal, and the first end of the second capacitor component is simultaneously connected to pin 15 of the control chip and the 5V non-isolated power supply; wherein the first capacitor component includes capacitor C105 and capacitor C104 arranged in parallel, and the second capacitor component includes capacitor C53 and electrolytic capacitor E3 arranged in parallel.

4. The air conditioner after-sales detection system according to claim 3, characterized in that: The isolated communication circuit includes a first isolated communication circuit, a second isolated communication circuit and a communication terminal XS17 with a 1-4 interface; the first communication circuit includes a resistor R118, a resistor R121, a transistor Q3, a resistor R110, a first isolated high-speed communication optocoupler IC19 with a 1-6 interface, a capacitor C57, a resistor R114 and a resistor R119, the first end of the resistor R118 is connected to the 60 pin of the control chip, the second end of the resistor R118 is simultaneously connected to the first end of the resistor R121 and the base of the transistor Q3, the second end of the resistor R121 is simultaneously connected to the emitter of the transistor Q3 and the ground terminal, The collector of the transistor Q3 is connected to the 3 interface of the first isolated high-speed communication optocoupler IC19, the 1 interface of the first isolated high-speed communication optocoupler IC19 is connected to the first end of the resistor R110, the second end of the resistor R110 is connected to the 5V non-isolated power supply, the first end of the capacitor C57 is simultaneously connected to the 4-5 interface of the first isolated high-speed communication optocoupler IC19, the first end of the resistor R114, the first end of the resistor R119 and the ground terminal, the second end of the capacitor C57 is simultaneously connected to the second end of the resistor R114 and the 5V isolated power supply, and the resistor R119 is connected to the 3 interface of the communication terminal XS17; The second communication circuit includes a capacitor C62, a resistor R130, a resistor R126, a capacitor C60, a second isolated high-speed communication optocoupler IC20 with a 1-6 interface, a resistor R124, a transistor Q4, a resistor R127 and a resistor R125, wherein a first end of the capacitor C62 is simultaneously connected to pin 59 of the control chip and a first end of the resistor R130, a second end of the capacitor C62 is simultaneously connected to a first end of the capacitor C60, a ground end and an interface 4 of the second isolated high-speed communication optocoupler IC20, a second end of the resistor R130 is simultaneously connected to a first end of the resistor R126, a second end of the capacitor C60 and an interface 5 of the second isolated high-speed communication optocoupler IC20, a second end of the resistor R126 is simultaneously connected to the 5V non-isolated power supply, the capacitor C60 The second end of is connected to the 6 interface of the second isolated high-speed communication optocoupler IC20, the 1 interface of the second isolated high-speed communication optocoupler IC20 is connected to the first end of the resistor R124, the second end of the resistor R124 is connected to the 5V isolated power supply, the 3 interface of the second isolated high-speed communication optocoupler IC20 is connected to the collector of the transistor Q4, the emitter of the transistor Q4 is simultaneously connected to the first end of the resistor R127 and the ground end, the base of the transistor Q4 is simultaneously connected to the second end of the resistor R127 and the first end of the resistor R125, the second end of the resistor R125 is connected to the 2 interface of the communication terminal XS17; the 4 interface of the communication terminal XS17 is connected to the ground end, and the 1 interface of the communication terminal XS17 is connected to the 5V isolated power supply.

5. The air conditioner after-sales detection system according to claim 3, characterized in that: The non-isolated communication circuit includes a first non-isolated communication circuit and a second non-isolated communication circuit, wherein the first non-isolated communication circuit includes a capacitor C47, a resistor R86, a resistor R92, a resistor R98, a resistor R90, a resistor R95, a resistor R100, a resistor R85, a resistor R101, a chip U5 with a 1-8 interface, a resistor R93, a resistor R96, a capacitor C48, an electrolytic capacitor E2, and a communication terminal XS10 with a 1-5 interface, wherein the first end of the capacitor C47 is simultaneously connected to the 7th pin of the control chip, the resistor R8 6 is connected to the first end of the resistor R90, the second end of the capacitor C47 is connected to the ground, the second end of the resistor R86 is simultaneously connected to the first end of the resistor R92, the first end of the resistor R98 and the 5V non-isolated power supply, the second end of the resistor R90 is simultaneously connected to the first end of the resistor R85 and the 1 interface of the chip U5, the second end of the resistor R85 is connected to the 7 interface of the chip U5 and the first end of the resistor R93, the second end of the resistor R93 is simultaneously connected to the first end of the capacitor C48 One end, the negative end of the electrolytic capacitor E2, the 3-4 interface of the communication terminal XS10, the 5 interface of the chip U5 and the ground terminal are connected, the second end of the capacitor C48 is simultaneously connected to the 8 interface of the chip U5, the 5V non-isolated power supply, the positive end of the electrolytic capacitor E2 and the 2 interface of the communication terminal XS10, the second end of the resistor R92 is simultaneously connected to the 9 pin of the control chip and the first end of the resistor R95, the second end of the resistor R95 is connected to the 2-3 interface of the chip U5, the resistor R The second end of 98 is simultaneously connected to the 8th pin of the control chip and the first end of the resistor R100, the second end of the resistor R100 is simultaneously connected to the 4th interface of the chip U5 and the first end of the resistor R101, the second end of the resistor R101 is simultaneously connected to the 6th interface of the chip U5 and the first end of the resistor R96, the second end of the resistor R96 is simultaneously connected to the 5th interface of the communication terminal XS10 and the second end of the resistor R93, and the 1st interface of the communication terminal XS10 is connected to the 12V non-isolated power supply; The second non-isolated communication circuit includes a communication terminal XS14 with a 1-4 interface, a resistor R104, a resistor R105, a resistor R107, a resistor R109, a capacitor C54, a diode DZ8 and a diode DZ7, wherein a first end of the resistor R107 is connected to pin 23 of the control chip, a second end of the resistor R107 is simultaneously connected to a first end of the resistor R105, a negative terminal of the diode DZ7, a first end of the capacitor C54 and a 2 interface of the communication terminal XS14, and a second end of the resistor R105 is simultaneously connected to pin 23 of the diode DZ7. The first end of the resistor R104, the 4 interface of the communication terminal XS14 and the 5V non-isolated power supply are connected, the positive end of the diode DZ7 is connected to the positive end of the diode DZ8 and the ground terminal, the second end of the capacitor C54 is connected to the ground terminal, the first end of the resistor R109 is connected to the 22 pin of the control chip, the second end of the resistor R109 is simultaneously connected to the negative end of the diode DZ8, the second end of the resistor R104 and the 1 interface of the communication terminal XS14, and the 3 interface of the communication terminal XS14 is connected to the ground terminal.

6. The air conditioner after-sales detection system according to claim 3, characterized in that: The current loop isolation circuit includes a P1 terminal for receiving a neutral line high voltage signal, a P2 terminal for receiving a low voltage signal, a resistor R61, a resistor R65, a capacitor C43, a diode D7, a thermistor PTC1, a diode D5, a resistor R63, a resistor R66, a diode D6, a capacitor C41, an optical coupler U1, an optical coupler U2, a resistor R64, a resistor R62, a resistor R67, a resistor R68, a resistor R70, a resistor R69, a capacitor C42 and a transistor Q2, wherein the P1 terminal is simultaneously connected to the first end of the resistor R61, the negative end of the diode D5, the first end of the resistor R63, the The first end of the capacitor C41 is connected to the first end of the optical coupler U1, the second end of the resistor R61 is connected to the first end of the resistor R65, the second end of the resistor R65 is connected to the first end of the capacitor C43, the second end of the capacitor C43 is connected to the P2 end and the negative end of the diode D7, the positive end of the diode D7 is connected to the first end of the thermistor PTC1, the second end of the thermistor PTC1 is connected to the positive end of the diode D6, the first end of the resistor R66, the positive end of the diode D6 and the first end of the optical coupler U2, the resistor The second end of R66 is simultaneously connected to the second end of the resistor R63, the cathode end of the diode D6, the second end of the capacitor C41, the second end of the optocoupler U1 and the second end of the optocoupler U2. The third end of the optocoupler U1 is connected to the 5V non-isolated power supply. The fourth end of the optocoupler U1 is simultaneously connected to the first end of the resistor R64 and the first end of the resistor R62. The second end of the resistor R64 is connected to the ground. The second end of the resistor R62 is simultaneously connected to the first end of the capacitor C42 and the 54th pin of the control chip. The second end of the capacitor C42 is connected to the ground. The third end of the optical coupler U2 is connected to the first end of the resistor R68 and the first end of the resistor R67 at the same time, the second end of the resistor R67 is connected to the 5V non-isolated power supply, the second end of the resistor R68 is connected to the fourth end of the optical coupler U2 and the collector of the transistor Q2 at the same time, the emitter of the transistor Q2 is grounded, the base of the transistor Q2 is connected to the first end of the resistor R70, the second end of the resistor R70 is connected to the 55 pin of the control chip and the first end of the resistor R69 at the same time, and the second end of the resistor R69 is connected to the 5V non-isolated power supply.

7. The air conditioner after-sales detection system according to claim 3, characterized in that: The detection circuit includes an AC internal fan detection circuit for detecting whether an AC fan in an air conditioner fails, a DC internal fan detection circuit for detecting whether a DC fan in an air conditioner fails, and a stepper motor detection circuit for detecting whether a stepper motor in an air conditioner fails.

8. An air conditioner after-sales detection system according to claim 7, characterized in that: The AC internal fan detection circuit includes a first detection circuit and a speed feedback circuit, wherein the first detection circuit includes a detection terminal XS6 with a 1-3 interface, a resistor R42, a diode D3, a capacitor C31, a resistor R46, a diode D4, an optocoupler IC13, a resistor R48, a resistor R45 and a capacitor C32, the first end of the resistor R42 is connected to the 3 interface of the detection terminal XS6, the second end of the resistor R42 is connected to the positive terminal of the diode D3, the negative terminal of the diode D3 is simultaneously connected to the first end of the capacitor C31, the first end of the resistor R46, the negative terminal of the diode D4 and the first end of the optocoupler IC13, the second end of the capacitor C31, the second end of the resistor R46, the positive terminal of the diode D4 and the The second end of the optocoupler IC13 is simultaneously connected to the 1 interface of the detection terminal XS6, the third end of the optocoupler IC13 is connected to the 5V non-isolated power supply, the fourth end of the optocoupler IC13 is simultaneously connected to the first end of the resistor R45 and the first end of the resistor R48, the second end of the resistor R45 is simultaneously connected to the first end of the capacitor C32 and the 51 pin of the control chip, and the second end of the resistor R48 is simultaneously connected to the second end of the capacitor C32 and the ground terminal; the speed feedback circuit includes a detection terminal CN1 with a 1-3 interface, the 1 interface of the detection terminal CN1 is connected to the ground terminal, the 2 interface of the detection terminal CN1 is connected to the 48 pin of the control chip, and the 3 interface of the detection terminal CN1 is connected to the 12V non-isolated power supply.

9. The air conditioner after-sales detection system according to claim 7, characterized in that: The DC internal fan detection circuit includes a detection terminal XS1 with a 1-6 interface, a resistor R160, a resistor R161, a resistor R162, a resistor R164, an optical coupler U12, an optical coupler U13, an optical coupler U14, a resistor R12, a resistor R16, a diode D1, a capacitor C9, a resistor R163, a resistor R17, a capacitor C11, a diode D2, a resistor R23, a resistor R28, a resistor R32 and a transistor Q1, wherein the 1 interface of the detection terminal XS1 is connected to the first end of the resistor R160, the second end of the resistor R160 is connected to the first end of the optical coupler U12, and the second end of the optical coupler U12 is connected to the 5V non-isolated power supply , the third end of the optical coupler U12 is simultaneously connected to the first end of the resistor R16 and the first end of the resistor R12, the second end of the resistor R16 is simultaneously connected to the ground terminal and the first end of the capacitor C9, the second end of the resistor R12 is simultaneously connected to the positive terminal of the diode D1, the second end of the capacitor C9 and the 53 pin of the control chip, the negative terminal of the diode D1 is connected to the 5V non-isolated power supply, the 3 interface of the detection terminal XS1 is simultaneously connected to the first end of the resistor R161, the first end of the resistor R162 and the first end of the resistor R164, the second end of the resistor R161 is simultaneously connected to the fourth end of the optical coupler U12 The first end of the optical coupler U12 is connected to the second end of the optical coupler U14, the second end of the resistor R162 is connected to the fourth end of the optical coupler U13, the second end of the resistor R164 is connected to the fourth end of the optical coupler U14, the 5th interface of the detection terminal XS1 is connected to the first end of the optical coupler U13, the 6th interface of the detection terminal XS1 is connected to the first end of the optical coupler U14, the second end of the optical coupler U13 is simultaneously connected to the second end of the optical coupler U12 and the second end of the optical coupler U14, the third end of the optical coupler U13 is simultaneously connected to the first end of the resistor R17 and the first end of the resistor R163, the second end of the resistor R17 is simultaneously connected to the first end of the capacitor C11 and the diode The positive terminal of D2 is connected to pin 56 of the control chip, the second end of the resistor R163 is connected to the second end of the capacitor C11 and the ground terminal at the same time, the negative terminal of the diode D2 is connected to the 5V non-isolated power supply, the third end of the optocoupler U14 is connected to the first end of the resistor R23, the second end of the resistor R23 is connected to the collector of the transistor Q1, the base of the transistor Q1 is connected to the first end of the resistor R28 and the first end of the resistor R32 at the same time, the emitter of the transistor Q1 is connected to the second end of the resistor R32 and the ground terminal at the same time, and the second end of the resistor R28 is connected to pin 52 of the control chip.

10. The air conditioner after-sales detection system according to claim 7, characterized in that: The stepper motor detection circuit includes a capacitor C5, a resistor R9, a resistor R15, an optocoupler IC4, a resistor R4, a capacitor C4, a detection terminal XS5 with a 1-5 interface, a capacitor C14, an optocoupler IC8, a resistor R21, a resistor R27, a resistor R31, a capacitor C18, a capacitor C26, an optocoupler IC12, a resistor R36, a capacitor C22, a resistor R41, a resistor R47, a capacitor C30, a capacitor C36, an optocoupler IC17, a resistor R52, a resistor R57, a resistor R60 and a capacitor C40, a first end of the capacitor C5 and a first end of the resistor R9 are simultaneously connected to pin 27 of the control chip, a second end of the capacitor C5 is connected to the ground terminal, and a second end of the resistor R9 is simultaneously connected to the ground terminal. The first end of the resistor R15 is connected to the first end of the optocoupler IC4, the second end of the resistor R15 is connected to the ground, the second end of the optocoupler IC4 is connected to the first end of the capacitor C4 and the 5V non-isolated power supply, the second end of the capacitor C4 is connected to the ground, the third end of the optocoupler IC4 is connected to the first end of the resistor R4, the second end of the resistor R4 is connected to the 12V non-isolated power supply, the fourth end of the optocoupler IC4 is connected to the 5 interface of the detection terminal XS5, the first end of the capacitor C18 and the first end of the resistor R27 are connected to the 26 pin of the control chip, the second end of the capacitor C18 is connected to the ground, and the second end of the resistor R27 is connected to the 12V non-isolated power supply at the same time. The first end of the optocoupler IC8 is connected to the first end of the resistor R31, the second end of the resistor R31 is connected to the ground, the second end of the optocoupler IC8 is simultaneously connected to the first end of the capacitor C14 and the 5V non-isolated power supply, the second end of the capacitor C14 is connected to the ground, the third end of the optocoupler IC8 is connected to the first end of the resistor R21, the second end of the resistor R21 is connected to the 12V non-isolated power supply, the fourth end of the optocoupler IC8 is connected to the 4 interface of the detection terminal XS5, the first end of the capacitor C30 and the first end of the resistor R41 are simultaneously connected to the 25 pin of the control chip, the second end of the capacitor C30 is connected to the ground, and the first end of the resistor R41 is connected to the 25 pin of the control chip. The two ends are simultaneously connected to the first end of the resistor R47 and the first end of the optocoupler IC12, the second end of the resistor R47 is connected to the ground, the second end of the optocoupler IC12 is simultaneously connected to the first end of the capacitor C26 and the 5V non-isolated power supply, the second end of the capacitor C26 is connected to the ground, the third end of the optocoupler IC12 is connected to the first end of the resistor R36, the second end of the resistor R36 is connected to the 12V non-isolated power supply, the fourth end of the optocoupler IC12 is connected to the 3 interface of the detection terminal XS5, the first end of the capacitor C40 and the first end of the resistor R257 are connected to the 24 pin of the control chip, and the second end of the capacitor C40 is connected to the ground.The second end of the resistor R57 is connected to the first end of the resistor R60 and the first end of the optocoupler IC17, the second end of the resistor R60 is connected to the ground, the second end of the optocoupler IC17 is connected to the first end of the capacitor C36 and the 5V non-isolated power supply, the second end of the capacitor C36 is connected to the ground, the third end of the optocoupler IC17 is connected to the first end of the resistor R52, the second end of the resistor R52 is connected to the 12V non-isolated power supply, the fourth end of the optocoupler IC17 is connected to the 2 interface of the detection terminal XS5, the 1 interface of the detection terminal XS5 is connected to the 12V non-isolated power supply and the first end of the capacitor 22, and the second end of the capacitor 22 is connected to the ground. , 11. The air conditioner after-sales detection system according to claim 1, characterized in that: The buzzer alarm circuit includes a resistor R280, a resistor R290, a transistor Q10, a resistor R270, a diode D20 and a buzzer BUZ1. The first end of the resistor R280 is connected to the control chip, the second end of the resistor R280 is simultaneously connected to the base of the transistor Q10 and the first end of the resistor R290, the second end of the resistor R290 is simultaneously connected to the ground terminal and the emitter of the transistor Q10, the collector of the transistor Q10 is simultaneously connected to the first end of the resistor R270, the positive end of the diode D20 and the first end of the buzzer BUZ1, and the second end of the resistor R270 is simultaneously connected to the negative end of the diode D20, the second end of the buzzer BUZ1 and the 5V non-isolated power supply.

12. The air conditioner after-sales detection system according to claim 1, characterized in that: The red light alarm circuit includes a connection terminal CN2 with a 1-4 interface, a resistor R137 and an alarm indicator light LED1. The 4 interface of the connection terminal CN2 is connected to the first end of the resistor R137, the second end of the resistor R137 is connected to the positive end of the alarm indicator light LED1, and the negative end of the alarm indicator light LED1 is simultaneously connected to the 3 interface of the connection terminal CN2 and the ground end.

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