Highly-integrated defrosting circuit of air conditioner

Abstract

The invention provides a highly-integrated defrosting circuit of an air conditioner. The highly-integrated defrosting circuit comprises three defrosting module circuits including an outdoor plate defrosting circuit, an outdoor pipe defrosting circuit and a current defrosting circuit, wherein the outdoor plate defrosting circuit conditionally enters an outdoor plate for defrosting after an outdoor plate defrosting device is judged to be closed; the outdoor pipe defrosting circuit conditionally enters an outdoor pipe for defrosting through detecting the temperature of the outdoor pipe; the current defrosting circuit conditionally enters an intelligent current defrosting mode through collecting the temperature of an indoor pipe and the operating current value of a pressing machine; and the three defrosting module circuits are connected to a same pin of an MCU (micro control unit), and the pin is provided with an I / O (input / output) port and has an A / D (analog to digital) conversion multiplexing function. By adopting the scheme, the highly-integrated defrosting circuit has the most obvious advantage that the air conditioner compatible with multiple defrosting schemes adopts an electric control PCB (printed circuit board) to be compatible with the three defrosting hardware circuits which share the pin of the MCU, so that I / O ports of the MCU are saved; and the defrosting schemes can be selected by only changing a hardware jumper wire, and the corresponding defrosting circuit is accessed into an electric control system, so that the electric control board is designed to be simple and is convenient to produce.

Description

technical field [0001] The invention relates to the technical field of air conditioners, in particular to a highly integrated defrosting circuit of an air conditioner. Background technique [0002] When the air conditioner is in the heating operation state in winter, the low-temperature and low-pressure liquid refrigerant absorbs the surrounding heat in the outdoor unit. When the outdoor ambient temperature is too low (usually lower than 7 degrees), the evaporation temperature of the heat exchanger is below 0 degrees, and the water in the air After the steam is condensed, it attaches to the condenser of the air conditioner, condenses into frost, and covers the outer surface of the heat exchanger. As the running time increases, the thickness of the frosting will increase, which will lead to a decrease in the heat transfer capacity of the system heat exchanger, reduce the heating effect of the system, increase energy consumption, and cause system blockage in severe cases. In ...

AI Technical Summary

Problems solved by technology

Different defrosting schemes have different software and hardware designs, resulting in more types of electronic control, which is not conducive to production management

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