Method and device for acquiring direct current busbar voltage given value of air conditioner system

Abstract

The invention discloses a method for acquiring a direct current busbar voltage given value of an air conditioner system and a device for acquiring the direct current busbar voltage value of the air conditioner system. The acquiring method comprises the following steps: acquiring a motor parameter of a compressor, a running current and a running frequency of the compressor in the air conditioner system; calculating a weak magnetic critical voltage based on the motor parameter, the running current and the running frequency, and acquiring a standby voltage given value based on the weak magnetic critical voltage; detecting an input voltage of the compressor, and acquiring an input voltage peak value based on the input voltage; and limiting the amplitude of the standby voltage given value based on the input voltage peak value, a preset lowest busbar voltage given value and a preset highest busbar voltage given value, so as to acquire the direct current busbar voltage given value. The acquiring method allows the direct current busbar voltage given value to meet the running requirements of the compressor, the hardware voltage-resistance requirements, and the lowest working voltage requirements of a switch power supply inside the air conditioner system at the same time, and allows a PFC circuit to have only the voltage boosting function.

Description

technical field [0001] The present invention relates to the technical field of air-conditioning systems, in particular to a method for obtaining a given DC bus voltage of an air-conditioning system and a device for obtaining a given DC bus voltage of an air-conditioning system. Background technique [0002] Usually, in household air conditioners and other similar systems, the single-phase AC power from the power grid passes through an uncontrollable full-bridge rectifier circuit and a PFC (Power Factor Correction, power factor correction) circuit to output DC power for large-capacity electrolytic capacitors and loads such as air-conditioning systems. Internal switching power supply and compressor etc. provide electric energy. Typically, the Boost PFC circuit can not only achieve a higher power factor, but also boost and output a stable DC voltage, thereby providing a stable DC power supply to the load. [0003] The setting of the DC bus voltage must be reasonable to meet th...

AI Technical Summary

Problems solved by technology

In addition, the Boost PFC circuit only has a boost function, so that the given DC bus voltage cannot be lower than the peak value of the input voltage

Therefore, the combined effect of multiple factors makes the DC bus voltage setting complicated

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