Fault detection method and fault protective circuit for air-conditioning auxiliary electric heater

Abstract

The invention discloses a fault detection method and a fault protective circuit for an air-conditioning auxiliary electric heater. The heating temperature of the air-conditioning auxiliary electric heater is detected by means of a thermal protector, and during the time of exceeding a preset temperature, the air-conditioning auxiliary electric heater is controlled to be powered off and to stop operating. Current detection for an alternating current power supply return circuit of the air-conditioning auxiliary electric heater is achieved through a current detection circuit, if current is zero, alternating current power supply of the air-conditioning auxiliary electric heater is firstly cut off, after a preset time is prolonged, the air-conditioning auxiliary electric heater is again powered on, the current detection for the alternating current power supply return circuit is achieved another time, and if the current is still zero, the air-conditioning auxiliary electric heater is judged to break down. According to the fault detection method and the fault protective circuit for the air-conditioning auxiliary electric heater, on the premise that requirements of an air conditioner for overheating protection for an electric heater are met, accurate detection for electric heater fault is achieved, the probability of serious quality problems caused by abnormity of the electric heater and protective components is reduced, and overall safe performance of air-conditioning products is improved.

Description

technical field [0001] The invention belongs to the technical field of air-conditioning and refrigeration engineering, and in particular relates to a method and circuit structure design for realizing fault detection and protection of an auxiliary electric heater in an air-conditioning product. Background technique [0002] With the continuous development of refrigeration technology, air-conditioning products have gradually developed from a single refrigeration function in the past to today's comprehensive electrical equipment integrating refrigeration, heating, dehumidification, air purification and other functions. In order to improve the heating effect in winter, existing air-conditioning products mainly add an auxiliary electric heater to the indoor unit of the air conditioner, and use the heat generated by the auxiliary electric heater to meet the heating demand of users. The role of auxiliary electric heaters in air conditioners is becoming more and more important, espe...

AI Technical Summary

Problems solved by technology

However, this traditional control method cannot realize the detection of the fault of the auxiliary electric heater of the air conditioner itself. detection methods, which also pose a certain degree of threat to the safe operation of air-conditioning products, which may cause serious quality problems

Images