Zero-voltage and zero-current switching phase-shifted full-bridge converter with reduced output filter requirement

Abstract

In this paper, a novel zero-voltage and zero-current switching (ZVZCS) phase-shifted full-bridge (PSFB) converter is proposed to improve the efficiency of traditional PSFB converter. The proposed converter consists of two half-bridge inverters in the primary side and two center-tap rectifiers with one shared output filter in the secondary side. This structure allows the proposed converter to achieve a wide range of ZCS for lagging-leg switches and ZVS for leading-leg switches. The primary energy can be continuously transferred to the secondary side, which is helpful to reduce output filter requirement. The operational principle and design considerations are explained and analyzed in detail. A laboratory prototype with 320-385-V input 50-V/20-A output is built to verify the superior features of the proposed converter.