Compressor power-off demagnetization protection method and device, household electric appliance, and storage medium

Abstract

Embodiments of the present invention provide a compressor power-off demagnetization protection method, device, household appliance and storage medium, which belong to the technical field of household appliance control. The compressor power-off demagnetization protection method includes: detecting the phase current of the compressor; calculating the variation of the phase current of the compressor within a set time interval according to the detected phase current of the compressor; Comparing the variation of the phase current of the compressor with a set value, determining the operating condition of the compressor according to the comparison result; and controlling the input power of the compressor when it is determined that the compressor is in an abnormal state The pulse width modulation PWM circuit stops working. The power-off demagnetization protection method for the compressor prevents the demagnetization phenomenon of the compressor, reduces the failure rate of equipment, and improves the reliability of equipment operation.

Description

technical field [0001] The invention relates to the technical field of household appliance control, in particular to a compressor power-off demagnetization protection method, device, household appliance and storage medium. Background technique [0002] At present, frequency conversion air conditioners have become the mainstream of the market, and immediately, household appliances such as frequency conversion washing machines and frequency conversion refrigerators that protect frequency conversion compressors also emerged as the times require. As a key component, the frequency conversion compressor has various control schemes. One of the variable frequency compressor control schemes is based on the sine wave control of the motor control engine. In actual use and debugging, it is found that if the three-phase AC input power supply VAC is suddenly disconnected during the operation of the motor, a large current overcurrent will occur. Chong phenomenon, Figure 5 That is to say,...

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Problems solved by technology

[0004] In the prior art, there is a method of cutting off the input power to avoid demagnetization by detecting that the phase current of the compressor exceeds the set value. This method can provide over-current protection for the compressor, but the above-mentioned current still exists at the moment of cutting off the power. The phenomenon of overshoot, that is, there is still a risk of compressor demagnetization, and it cannot effectively improve the phenomenon of compressor demagnetization caused by disconnection of power supply or other overshoot currents

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