A Novel soft switching flyback converter with synchronous rectification

This paper proposed a novel control scheme for soft switching flyback converter with synchronous rectification. By only adjusting the driver signal of the primary and secondary synchronous switches with the proposed control scheme, ZVS could be realized both at low and high input within 90 V-265 V AC at any load line. Stead-state operation waveforms and equivalent circuits has been presented in detail, and both the analysis and the experimental results show that with the proposed control scheme, The ZVS of the primary switch could be easily achieved, and consequently a high efficiency.