Air conditioner, and control method and control device of air conditioner

Abstract

The invention discloses an air conditioner, and a control method and a control device of the air conditioner. The method comprises the following steps: an input voltage effective value and an input current effective value of the air conditioner are acquired; whether the air conditioner is in a power supply voltage dropping state is judged according to the input voltage effective value; if the air conditioner is in a power supply voltage dropping state, then whether the input current effective value is greater than a first current threshold is judged; and if the input current effective value is greater than the first current threshold, target running frequency of a compressor is reduced, and the running frequency of the compressor is controlled to reach reduced target running frequency at a first frequency reduction rate so as to allow the air conditioner to enter a rapid frequency reduction mode, wherein the first frequency reduction rate is greater than a normal frequency reduction rate of the compressor. Thus, when power supply voltage drops, the compressor is controlled to be subjected to rapid frequency reduction to allow a system to continue to operate, and a situation that the user experience is affected due to outage caused by the fact that overcurrent protection is triggered by too high input current resulting from voltage drop is prevented effectively.

Description

technical field [0001] The invention relates to the technical field of air conditioners, in particular to an air conditioner control method, an air conditioner control device and an air conditioner. Background technique [0002] In household air conditioners, refrigerators and other similar systems, the single-phase AC power from the power grid is generally rectified by a non-full bridge, and then boosted by a PFC (Power Factor Correction, power factor correction) circuit to output DC power for large Capacitance electrolytic capacitors and loads (such as system internal switching power supply, compressors and fans, etc.) supply power. Among them, the compressor is the main load, and the output power of the compressor accounts for more than 90% of the total input power at the rated output. [0003] Generally, Boost PFC circuits are used in air-conditioning systems, which can not only achieve a higher power factor, but also boost and output a stable DC bus voltage, thereby pr...

AI Technical Summary

Problems solved by technology

[0004] However, in rural areas, urban villages, heavy industrial areas and other areas with poor power grids, the grid voltage often fluctuates. When the input grid voltage drops,

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