Overcurrent protection device, PFC circuit, air conditioner and overcurrent protection method thereof

Abstract

The invention discloses an overcurrent protection device, a PFC circuit, an air conditioner and an overcurrent protection method thereof. The device comprises a detection circuit (102) and a cutoff circuit (104). The detection circuit (102) is used for detecting whether an overcurrent phenomenon occurs in a to-be-protected PFC circuit or not and sending a set triggering signal to the cutoff circuit (104) if the overcurrent phenomenon occurs in the PFC circuit. The cutoff circuit (104) is used for receiving the triggering signal and cutting off power of a drive signal of the PFC circuit based on the triggering signal, thereby interrupting load operation of the PFC circuit. According to the scheme provided by the invention, the problem that in the prior art, the PFC circuit overcurrent protection timeliness is low due to the fact that a program needs certain time to carry out processing and comparison computing on sample signals in a PFC circuit overcurrent protection software control process is solved, so an effect of improving the PFC circuit overcurrent protection timeliness is achieved.

Description

technical field [0001] The invention belongs to the technical field of PFC overcurrent protection, and in particular relates to an overcurrent protection device, a PFC circuit, an air conditioner and an overcurrent protection method thereof, in particular to an air conditioner PFC hardware protection circuit, a PFC circuit with the hardware protection circuit, and a PFC circuit with the hardware protection circuit. The air conditioner of the PFC circuit, and the overcurrent protection method of the air conditioner. Background technique [0002] In recent years, frequency conversion air conditioners and other frequency conversion high-power machines have adopted PFC (that is, power factor correction) circuits to improve power conversion efficiency. In order to protect compressors and other downstream loads or power devices from overcurrent damage, usually the control of PFC overcurrent protection is controlled by software. The working principle is: sampling the loop current o...

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Problems solved by technology

[0003] The object of the present invention is to, aim at above-mentioned defect, provide a kind of overcurrent protection device, PFC circuit, air conditioner and overcurrent protection method thereof, to solve the software control of PFC circuit overcurrent protection in the prior art, due to the program to sampling signal It takes a certain amount of time to process and compare calculations, so when the delay time is long, the PFC circuit will be over-current and burned, resulting in poor timeliness of the PFC circuit over-current protection, to achieve the effect of improving the timeliness of the PFC circuit over-current protection

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