Abstract

An optimized phase-shifted full-bridge converter for wide input voltage range

Author(s): Shi Jianfei, Wang Dongxin, Gao Xuesong

Zero-voltage phase-shifted full-bridge converters (PSFB ZVS) have been widely used in the high frequency, high power applications with these characteristics of zero-voltage switching (ZVS) by Phase shifting based on the fixed frequency. Howeverï¼Ã‚ÂŒthe load and input voltage range for full power transistors realizing ZVS are limited. So this paper proposes a solution with adding a coupled inductor on the primary side of transformerï¼Ã‚ÂŒ as well as adopting active clamping topology on the secondary side. The auxiliary circuit can achieve adaptive energy storage by the processorï¼Ã‚ÂŒmake the input voltage range and load range of ZVS of all switching tubes greater, reduce the circulation and conduction losses, minimize the duty cycle of secondary loss problems.