Air conditioner, air conditioner indoor and outdoor unit communication circuit and fault detection method thereof

Abstract

The invention discloses an air conditioner, an air conditioner indoor and outdoor unit communication circuit and a fault detection method thereof. The air conditioner indoor and outdoor unit communication circuit comprises a first communication module, a second communication module, a detection module, a control module, a power supply module and a communication line, wherein the power supply module comprises a first power supply and a second power supply which are connected in parallel; the communication line comprises a first communication path and a second communication path which are connected in parallel; the detection module is used for detecting the loop current of a communication loop and outputting the loop current to the control module; the control module is used for controlling the first power supply to be disconnected and the second power supply to be connected when the communication fault of the communication loop occurs and the loop current is determined to be less than the preset current; and the control module is also used for controlling the first communication path to be disconnected and the second communication path to be connected when the loop current is determined to be less than the preset threshold after the first power supply is disconnected and the second power supply is connected so that the communication line can be automatically switched when the indoor and outdoor unit connecting line fails and the maintenance cost can be saved.

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] Such as 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 re...

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