A modified asymmetrical pulse-width-modulated resonant DC/DC converter topology

A modified asymmetrical pulse-width-modulated resonant DC/DC converter employing an auxiliary circuit is proposed in this paper. The auxiliary circuit consists of a network of two capacitors and an inductor. The aim of this network is to produce zero-voltage-switching (ZVS) over a wide input voltage range, while reducing the voltage and current stress across the resonant inductor. A detailed analysis is presented and performance curves are given. Experimental results for a 35 W, 5 V converter show an efficiency of about 81% at a constant operating frequency of 500 kHz.