The research of PWM DC-DC converter based on TMS320F28335

Abstract

Transformer original edges circulation of traditional phase-shifted full bridge ZVS PWM converter caused larger loss of conduction and reduced the system efficiency. In this paper a phase-shifted full bridge hybrid ZVZCS PWM converter is proposed to overcome these weakness. The realization of leading-leg is based on the non-mutation theory of capacitor voltages. And the realization of zero current (ZCS) switching of lagging-leg benefits from the saturated inductance which makes the original edge current reset to zero during transformer original edge voltage cross zero and clamp in zero current. This paper presents the operational principle and implementation process of the proposed coverter. Finally, the experiment results verify the feasibility of the proposed method. © Springer-Verlag Berlin Heidelberg 2011.