DESIGN AND ANALYSIS OF H-SOFT-SWITCHED CONVERTERS

An H-soft-switched cell is proposed to obtain soft switching in single -switch nonisolated DC-to-DC converters. The proposed cell provides co nstant-frequency loss-less switching. It may be regarded as a soft swi tch with a similar control circuit to that used in conventional PWM co nverters. Based on an equal area concept, a unified method for steady- state analysis is also proposed. The concept of equivalent effective d uty is introduced to simplify the design of the converters. Experiment al results of an H-soft-switched boost converter are presented to veri fy the proposed topologies and the analytical methods.