A new ZCS quasi-resonant unity power factor rectifier with reduced conduction losses

Abstract

This paper presents a novel single-phase unity power factor rectifier, which features current-sense frequency control and zero-current switching with no auxiliary switches. The reduced conduction losses are achieved by the employment of a single converter, instead of the typical configuration composed of a front end rectifier followed by a boost converter. Experimental results of a 250 W converter with 127 V/sub rms/ input voltage and 200 V/sub DC/ output voltage are presented. Theoretical analysis, a design example, simulation results and the control circuitry are also presented in the paper. The zero-current-switching makes this topology very attractive to high power IGBT applications.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>