Compressor out-of-step prevention circuit, control method and air conditioner

Abstract

The invention discloses a compressor out-of-step prevention circuit, a control method and an air conditioner. The out-of-step prevention circuit includes: an AC input voltage detection module for detecting the peak value of the AC input voltage of an air-conditioning unit; A compressor frequency calculation module for adaptively adjusting the upper limit frequency of the compressor according to the peak value of the AC input voltage; used to perform the frequency reduction on the compressor faster than the normal frequency reduction speed according to the upper limit frequency determined by the compressor frequency calculation module A compressor control module for frequency adjustment; and an anti-fluctuation control module for starting the compressor into an anti-out-of-step mode according to a preset peak voltage fluctuation range threshold of the AC input voltage. By adopting the invention, the out-of-step problem of the compressor caused by the sharp fluctuation of the grid voltage can be effectively avoided.

Description

technical field [0001] The invention relates to compressor technology, in particular to a compressor out-of-step prevention circuit, a control method and an air conditioner. Background technique [0002] With the improvement of people's living standards and the enhancement of energy-saving and emission-reduction awareness, inverter air conditioners are becoming more and more popular. However, the compressor of the inverter air conditioner often causes out-of-step phenomena due to accidents. How to avoid the out-of-step phenomenon of the compressor is an important issue to be solved urgently. [0003] The invention patent with the publication number CN 107883553 B provides a frequency reduction control method and device for an inverter compressor. It firstly controls the variable frequency compressor to reduce the frequency at the first preset speed, when the frequency of the variable frequency compressor drops to the preset stop frequency, compares the magnitude of the phas...

AI Technical Summary

Problems solved by technology

This control method only detects the current of the compressor and executes the corresponding frequency reduction strategy to prevent the compressor from running out of control, but it does not take into account the problem that the sharp fluctuation of the grid input voltage will still cause the compressor to run out of control

[0004] The invention application with the publication number CN 111102178 A provides a compressor frequency control method by comparing the operating power of the compressor with the preset frequency reduction power. It also does not consider the influence of the voltage on the compressor, which cannot guarantee When the voltage drops sharply, the compressor will still lose step, resulting in a problem that the reliability of the air conditioner is reduced

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