Single-period power factor correction circuit

Abstract

The invention provides a single-period power factor correction circuit, which comprises a switch direct current voltage boosting circuit (10) and a sampling comparison circuit (20), wherein the sampling comparison circuit (20) is used for forming pulse width modulation signals and regulating the power factor of the input power of the switch direct current voltage boosting circuit (10), the switch direct current voltage boosting circuit (10) also comprises an inductor (L) and a rectifying circuit (12), a first alternating current input end of the switch direct current voltage boosting circuit (10) is formed at a first end of the inductor (L), the rectifying circuit (12) comprises a first alternating current end, a second alternating current end, a first direct current end and a second direct current end, the first alternating current end is connected with a second end of the inductor (L), a second alternating current input end of a power circuit is formed by the second alternating current end, a first node (A) is formed at the first direct current end, and the second direct current end is connected to a first input end of the sampling comparison circuit (20). The inductor is moved to the alternating current side of the rectifying circuit, and the input current is buffered and stabilized, so the service life of a single-period power factor corrector (PFC) is relatively prolonged.

Description

technical field [0001] The invention relates to a device for eliminating or compensating reactive power, in particular to a single-cycle power factor correction circuit. Background technique [0002] In order to reduce the input harmonic current and realize the synchronization of current and voltage, a power factor correction (PFC, PowerFactor Correction) circuit is required. However, the traditional power factor correction circuit technology is complicated, the design steps are cumbersome, many components are required, the volume is large and the cost is high, so it is often a compromise between performance and cost when designing. On the other hand, for the traditional topological active PFC circuit, a large peak current will be generated when the input AC voltage changes suddenly, which will adversely affect the rectifier bridge. [0003] In recent years, the emerging single-cycle PFC circuit can simplify the traditional PFC control circuit, avoid the use of complex anal...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a single-cycle power factor correction circuit to solve the problem in the prior art that the peak current will cause the single-cycle power factor correction circuit to reduce the reliability of power devices

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