Compressor protection method

Abstract

The invention relates to the field of refrigeration appliance compressor protection, in particular to a compressor protection method. The method realizes accurate protection of a compressor and greatly reduces the risk of misjudgment. According to the technical scheme, the method comprises the steps that the compressor power frequency and the power voltage are detected and judged before the compressor is started, the compressor shell temperature is detected and judged after conditions are met, the compressor is started if the conditions are met, the current and the voltage when the compressor is started are collected, equivalent impedance when the compressor is stalled is calculated, after the compressor is started, the voltage, the current and the compressor shell temperature in a normal operation process of the compressor are collected in real time, real-time equivalent impedance of the compressor is calculated according to the voltage and the current, collected in real time, in the normal operation process of the compressor, the equivalent impedance in operation is monitored in real time, and if the equivalent impedance in operation is reduced at the speed larger than the threshold value and the difference value between the equivalent impedance in operation and the equivalent impedance in stalling is smaller than the threshold value difference value, a corresponding switch of the compressor is switched off. The method is suitable for compressor protection.

Description

technical field [0001] The invention relates to the field of compressor protection for refrigeration appliances, in particular to a compressor protection method. Background technique [0002] The traditional fixed-frequency refrigerator compressor uses a current starter or a PTC starter as a starting device, and a thermal protector as a protection device provides protection for the compressor; however, due to limitations of its own characteristics, traditional mechanical starters and protectors have Disadvantages such as high parameter dispersion, poor compatibility, and high operating power consumption. [0003] Prior art, such as CN112228327A disclosed "a kind of electronic starter controller intelligent control system and method", on the basis of original starting device, use protection switch (as relay) to replace thermal protector, start switch (as relay) ) replaces the weight or PTC, and identifies the protection status by sampling the current, voltage, and shell temp...

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