Single-phase half-bridge voltage-multiplying rectification PFC (power factor correction) circuit

Abstract

The invention discloses a single-phase half-bridge voltage-multiplying rectification PFC (power factor correction) circuit which comprises a power circuit, a detection circuit and a control circuit, wherein voltage and current signals of the power circuit are connected with the control circuit through the detection circuit; the power circuit comprises a booster circuit and a rectification circuit; two output ends of the booster circuit are connected with the midpoints of two bridge arms of the rectification circuit; an output end of the rectification circuit is used for outputting a direct current voltage; the detection circuit is used for detecting power voltage zero passage, inductive current and output voltage signals of the power circuit; and an input end of the control circuit is connected with an output end of the detection circuit, an output end of the control circuit is connected with a gate pole of a power switch of the power circuit. The single-phase half-bridge voltage-multiplying rectification PFC circuit can output stable direct voltage and generate a unit input power factor at the same time, can realize flexible voltage regulation capacity, can obtain linear input impedance, can obtain higher output voltage under lower input voltage and can reduce power consumption and voltage-withstand grade of power devices. The single-phase half-bridge voltage-multiplying rectification PFC circuit has the advantages of strong university, simple structure and low cost.

Description

technical field [0001] The invention relates to an AC-DC converter in the technical field of power electronics, in particular to a single-phase half-bridge voltage doubler rectifier PFC circuit capable of output voltage doubler. Background technique [0002] With the development of power electronic technology, more and more power electronic devices are connected to the power grid for operation, and the problem of harmonic current in the power grid is becoming more and more serious. A large number of studies on the principle of harmonic current generation and its suppression have promoted the rapid development of power factor correction (PFC) technology. Among them, the single-phase active PFC technology is gradually mature, but the traditional single-phase PFC technology is suitable for higher input voltage, otherwise it will cause the volume of the boost inductor and the loss of the power device. Under this background, the present invention proposes a The single-phase half...

AI Technical Summary

Problems solved by technology

[0005] To sum up, when a low single-phase AC voltage is input, the traditional single-phase rectifier circuit has high requirements on power devices and high cost, and cannot be applied to the application occasions of low AC voltage input-high voltage DC output, and the traditional power factor control The circuit has a large limitation

Images