Harmonic current suppression method for refrigerator, frequency conversion plate and refrigerator refrigeration system

Abstract

The embodiment of the present invention discloses a method for suppressing the harmonic current of a refrigerator, a frequency conversion plate and a refrigerator refrigerating system, the method comprises: receiving a compressor target frequency transmitted by a main control board of the refrigerator and sending a starting command to the compressor if the target frequency of the compressor is greater than 0; calculating the power of the compressor according to the output voltage and the output current of the frequency conversion plate after the compressor is started; starting a power factor correction circuit if the power of the compressor is greater than or equal to a threshold; according to the input current phase and the voltage phase of the frequency conversion plate, adjusting the input current of the frequency conversion plate according to the power factor correction circuit, so that for the frequency conversion plate, the input current phase matches with the input voltage phaseand the harmonic current is suppressed. By adding the PFC circuit in the frequency conversion plate the modification cost is lower. The PFC circuit is started when the power of the compressor is greater than or equal to the threshold, the input current of the frequency conversion plate is adjusted, the input current phase matches with the input voltage phase, thereby suppressing the harmonic current, reducing standby power and improving the energy efficiency of the whole machine.

Description

technical field [0001] The invention relates to the technical field of refrigeration control, in particular to a method for suppressing harmonic current of a refrigerator, a frequency conversion board and a refrigerator refrigeration system. Background technique [0002] Recently, European countries have raised the EMI (Electromagnetic Interference, Electromagnetic Interference) harmonic current standards for household appliances such as refrigerators, requiring them to pass the CLASS D standard. It is expected that corresponding requirements will be made in China in the near future. Therefore, a PFC (Power Factor Correction, power factor correction) function must be added to the inverter refrigerator to meet the required harmonic current limit. [0003] The frequency conversion board of the existing frequency conversion refrigerator only has the frequency conversion control function, which cannot meet the requirements of international and domestic EMI standards. Directly ad...

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Problems solved by technology

[0003] The frequency conversion board of the existing frequency conversion refrigerator only has the frequency conversion control function, which cannot meet the requirements of international and domestic EMI standards. Directly adding harmonic suppression inductors or dedicated PFC control boards will cause mismatch problems in the coordinated control of multiple components. , resulting in high standby power, reduced energy efficiency of the whole machine, and increased rectification costs

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