Power factor correction converter based on magnetic coupling lossless buffer circuit

Abstract

The invention relates to a power factor correction converter based on a magnetic coupling lossless buffer circuit, comprising a rectifier bridge and a boosted circuit, wherein the boosted circuit comprises a boosted inductor with an auxiliary coupling winding and a buffer network; one end of the boosted inductor is connected with a rectifier bridge common cathode, the other end of the boosted inductor is connected with one end of the coupling winding, and the other end of the coupling winding is connected with a first diode anode; a main switch and a buffer inductor are connected among the boosted inductor, a coupling winding contact and a rectifier bridge common anode, and the buffer inductor and a main switch contact are connected with a second diode anode; a buffer capacitor and a third diode are connected among the coupling winding, a first diode contact and the rectifier bridge common anode, and the buffer capacitor and a third diode cathode contact are connected with a fourth diode anode. The invention can suppress the reverse recovery of the diodes, reduce the switching loss and improve the conversion efficiency; the auxiliary coupling winding is used for resetting the electric current of the buffer inductor; and the buffer capacitor is used for absorbing the energy reversely recovered by the diodes and transmitting the energy into an output capacitor, therefore, the lossless buffering is realized.

Description

technical field [0001] The invention relates to a power factor correction converter, especially a power factor correction converter with a lossless snubber circuit which can reduce diode reverse recovery loss. Background technique [0002] Current single-phase power factor correction converters such as figure 1 As shown, it includes a bridge rectifier circuit DB composed of four diodes, an inductor L, a main power switch S, a diode D and an output capacitor CO. One end of the inductor L is connected to the common cathode end of the rectifier circuit, and the other end is connected to the diode D The anode terminal of the diode D is connected to the anode terminal, the main power switch S is connected between the junction of the inductor L and the diode D and the common anode terminal of the rectifier circuit, the output capacitor CO is connected between the cathode terminal of the diode D and the common anode terminal of the rectifier circuit, and the load RO And connected ...

AI Technical Summary

Problems solved by technology

figure 1 The single-phase power factor correction converter shown is applied to the pre-stage pre-regulated power supply of universal input voltage to realize power factor correction. When the converter works in the inductor current continuous mode, the main power switch works in the hard switching state , the diode has a serious reverse recovery problem when it is turned on, which causes a large turn-on loss of the power switch, limits the increase of the operating frequency, and reduces the conversion efficiency of the circuit

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