A novel transformer winding for phase shift full bridge converter

Abstract

A phase-shift full-bridge (PSFB) converter with additional resonant inductor and clamping diodes is attractive topology in high power applications. The additional resonant inductor is used for improving zero voltage switching (ZVS) range and clamping voltage oscillation of the secondary rectifiers. However, since the high input voltage with small duty ratio is applied to the additional resonant inductor, it has very fast flux swing As a result, high eddy current loss and excess eddy current loss are occurred on magnetic core. To overcome this drawback, a new separated resonant inductor winding (SRW) is proposed. It can implement the additional resonant inductor and transformer using only one magnetic. Therefore, it can reduce the size, cost and core loss due to the additional resonant inductor. The experimental results shows that the proposed winding method can achieve high efficiency and high power density in a 1200 W (12 V,100 A) prototype converter.