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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. However,the 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 transformer, as well as adopting active clamping topology on the secondary side. The auxiliary circuit can achieve adaptive energy storage by the processor,make 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.

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