A kind of air conditioner, air conditioner internal and external unit communication circuit and its fault detection method

Abstract

The invention discloses an air conditioner, an air conditioner internal and external unit communication circuit and a fault detection method thereof, wherein the air conditioner internal and external unit communication circuit includes a first communication module, a second communication module, a detection module, a control module, a power supply module and a communication line; The power supply module includes a first power supply and a second power supply connected in parallel, and the communication line includes a first communication path and a second communication path connected in parallel; the detection module is used to detect the loop current of the communication loop, and output the loop current to Control module; the control module is used to control the disconnection of the first power supply and the conduction of the second power supply when the communication loop fails and the loop current is determined to be less than the preset current; the control module is also used for disconnecting the first power supply and switching on the second power supply. After the second power supply is turned on, when it is determined that the loop current is less than the preset threshold, the first communication path is controlled to be disconnected and the second communication path is turned on, thereby ensuring that the communication line can be automatically switched when the connection line of the internal and external units fails, saving maintenance costs.

Description

technical field [0001] The invention relates to the technical field of air-conditioning equipment, in particular to an air-conditioner, a communication circuit for internal and external units of the air-conditioner and a fault detection method thereof. Background technique [0002] At present, the communication between indoor and outdoor units of household inverter air conditioners mostly adopts the zero-fire wire communication method. The zero-fire wire communication circuit is composed of common components such as resistors, capacitors, diodes, transistors, and optocouplers. It does not require additional chips and has low hardware costs. Therefore, it is widely used in household inverter air conditioners. field. [0003] like figure 1 As shown, the zero live wire communication is a current loop communication method, and the on and off of the optocoupler in the circuit is determined by the loop current value. The magnitude of this current is greatly affected by the resis...

AI Technical Summary

Problems solved by technology

[0005] The invention provides an air conditioner, an air conditioner internal and external unit communication circuit and a fault detection method thereof, which can effectively solve the problem that the internal and external unit communication faults affecting the normal operation of the air conditioner caused by the failure of the internal and external unit connection lines

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