High-efficiency standby forward converter integrated with DC/DC Phase-Shift Full Bridge converter for server power supply system

Abstract

This paper presents high-efficiency standby forward converter integrated with the DC/DC Phase-Shift Full Bridge (PSFB) converter. By sharing one leg of DC/DC PSFB converter, the proposed converter features low voltage stress, no snubber and zero-voltage switching (ZVS) over the entire load range. Thus, the proposed converter has high-efficiency, especially under half load condition. Furthermore, by using forward-type transformer instead of flyback-type transformer in the same proposed structure, the proposed standby forward converter has low freewheeling current and higher efficiency. Experimental results of 700W prototype for server power supply system will be shown to demonstrate the feasibility of the proposed converter.