Novel current stress reduction technique for boost integrated half-bridge DC/DC converter with voltage doubler type rectifier

Abstract

A current stress reduction technique for a boost integrated half-bridge (BIHB) DC/DC converter with voltage doubler type rectifier is proposed for digital car audio amplifier application. In the proposed circuit, two external capacitors are added parallel to the rectifier diodes in the secondary side of the transformer to shape the primary and the secondary current like rectangular waveforms in every switching instance. The experimental results of a 200 W industrial sample show that the peak primary current decreases about by 10 A. Thus, the proposed technique shows improved high efficiency.