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

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_rms input voltage and 200 V_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