Design of a soft-switched phase-shift full bridge converter

In this paper, consideration and research of a soft switching phase shift full bridge dc/dc circuit with a leakage inductor is presented. By adding a primary-side energy storage inductor, the main switches in the convertor can get to soft switching condition. And when the convertor operates in the Peak-Current Mode Control (PCMC) and Continuous Conduction Mode (CCM) with the duty cycle of larger than 0.5, the system is not stable. Then a method of slope compensation is presented. And small-signal circuit model of PSFB DC/DC convertor is analysed in this paper.