Air conditioner and shutdown control method and device for compressor of air conditioner

Abstract

The invention discloses an air conditioner and a shutdown control method and device for a compressor of the air conditioner. The method includes the steps that when stop signals of the compressor are received, upper-arm power switch tubes of all bridge arm bodies in a three-phase arm are controlled to be turned off, and lower-arm power switch tubes of all the bridge arm bodies are controlled to be turned on or turned off at the same time through PWM signals or the lower-arm power switch tubes of all the bridge arm bodies are controlled to be turned off, and the upper-arm power switch tubes of all the bridge arm bodies are controlled to be turned on or turned off at the same time through the PWM signals to control a three-phase winding of the compressor to be subjected to a short circuit; the peak value of a three-phase current of the compressor is obtained; the duty ratio of the PWM signals is adjusted according to the peak value of the three-phase current and the limiting threshold value of a phase current of the compressor to adjust a braking current generated when the three-phase winding is subjected to the short circuit; braking torque is generated according to the braking current to control a rotor of the compressor to be braked, and the compressor stops operating accordingly. By means of the method, rapid braking and fixing of the compressor can be achieved, stress of a distributing tube in the air conditioner can be reduced, and the service life of the distributing tube in the air conditioner is prolonged.

Description

technical field [0001] The invention relates to the technical field of air conditioners, in particular to a method for controlling the shutdown of a compressor in an air conditioner, a device for controlling the shutdown of a compressor in an air conditioner, and an air conditioner. Background technique [0002] In the inverter air conditioner, since the rotor speed of the compressor cannot be detected directly, the compressor can only be controlled by a control method without a speed sensor. However, this method cannot achieve closed-loop control at low speeds. Therefore, the shutdown process of the inverter air conditioner generally uses the compressor to stop directly or directly stop after reducing the frequency to low-frequency operation, and cannot directly reduce the frequency to run to zero speed. [0003] For example, during the shutdown process of the air conditioner, when the stop signal of the compressor is received, the drive signal of the control compressor st...

AI Technical Summary

Problems solved by technology

However, due to the effect of the refrigerant pressure, the compressor may oscillate and attenuate and stop, which will cause piping vibration and affect the stress of the piping.

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