Abstract
This article proposes a novel zero-voltage switching (ZVS) dc–dc converter to improve the performances of the traditional phase-shifted full-bridge converter. In the primary side, two half-bridge converters (HBCs), leading-HBC, and lagging-HBC are placed in parallel and are driven in a phase-shifted control. The secondary side is a current doubler rectifier (CDR) circuit consisting of four rectified diodes and two output filter inductors. With this structure, the proposed converter can achieve wide ZVS range, minimized circulating current, and low-current ripple of output filter. Furthermore, the current stress of lagging-HBC is lower than that of leading-HBC; different current-rated switches can be employed for the two HBCs, which is a benefit to optimize the ZVS conditions and cost. In this article, the operational principle and performances of the proposed converter are analyzed in depth. Finally, experimental results from a prototype (320–400 V input, 110 V/10 A output) are presented to validate the theoretical analysis.
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