A novel buck converter with soft-switching transition

A novel soft-switched pulsewidth-modulation (PWM) buck converter is proposed in this paper, aimed at combining the desirable features of both the conventional PWM and resonant converters. In this proposed scheme, an auxiliary circuit is added to the conventional buck converter and used to achieve soft-switching for both the main switch and the freewheeling diode while not incurring any additional losses due to the auxiliary circuit itself. The operation of the converter is explained and analysed, and design guidelines are presented. To validate the feasibility of the proposed converter, a 100kHz, 180W prototype is implemented and tested.