Analysis of a zero voltage transition boost converter using a soft switching auxiliary circuit with reduced conduction losses

Abstract

This paper presents a zero-voltage-transition (ZVT) boost converter using a soft switching auxiliary circuit. The improvement over existing topologies lies in the structure and position of the auxiliary circuit capacitors and the subsequent reduction in the main switch resonant current. This converter has the following features: (1) soft switching of the main switch and boost diode under all operating conditions; (2) reduced auxiliary circuit losses due to soft switching of the auxiliary switch; (3) feedforward of a part of the auxiliary circuit energy to the output. The operation of this converter is analyzed and characteristic curves are presented, which help in the design process. Experimental results from a 250 W, 127 Volt input laboratory prototype switching at 100 kHz are shown which verify the advantages of this topology.