A new soft-switched PFC boost rectifier with integrated flyback converter for stand-by power

摘要

The paper presents a magnetic integration approach that reduces the number of magnetic components in a power supply by integrating the some magnetic components in two conversion stages. Specifically, in the proposed approach, a single transformer is used to implement the continuous-conduction-mode boost PFC converter and the DC-DC flyback converter. The integrated boost and flyback converters offer soft switching of all semiconductor switches including a controlled di/dt turn-off rate of the boost rectifier. The performance of the proposed approach was evaluated on a 150-kHz, 450-W, universal-line range boost PFC converter with 12-V/2.2-A integrated stand-by flyback converter.