Single-phase power factor correction circuit

Abstract

The invention provides a single-phase power factor correction circuit. The single-phase power factor correction circuit comprises a power circuit, a detection circuit and a control circuit, wherein the power circuit is a boost single-phase AC-DC circuit, the detection circuit is used for amplifying a weak current signal and then sending the weak current signal to the control circuit by phase shift-free filtering and rectification, and the control circuit is a single-phase power factor correction simulation controller. Under a high-power output condition, the single-phase power factor correctorworks in a high switching frequency and has same effect of a low-switching frequency single-phase power factor corrector, and the boost inductance quantity and the inductance volume are also reduced;and meanwhile, the weak current signal is amplified by an operational amplifier in the detection circuit, the resistance value of a detection resistor can be reduced, the power consumption is reduced, and heat generation is reduced.

Description

technical field [0001] The invention relates to a single-phase power factor correction technology, in particular to a high-power output power factor corrector technology, and in particular to a circuit for realizing power factor correction by reducing a current detection resistance at a high switching frequency. Background technique [0002] In the single-phase power grid, with the rapid development of power electronic technology, more and more power electronic equipment is put into use in the power grid, especially the switching power supply circuit and AC-DC-AC frequency conversion circuit using rectifier bridge and electrolytic capacitor as the front-end circuit The widespread use of the system has caused serious harmonic current pollution to the power grid. Active power factor correction technology has become an important technology to solve harmonic current pollution, especially the APFC circuit (Active Power Factor Correction, active power factor correction) composed o...

AI Technical Summary

Problems solved by technology

[0004] At present, the design of single-phase power factor correction circuits with high switching frequency, low sensitivity and low resistance is generally cumbersome, and shunt resistors usually generate greater power consumption and generate more heat, which cannot meet the needs of practical applications.

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