A zero voltage switching flyback converter topology

A zero voltage switching flyback power converter topology employing an auxiliary circuit is presented in this paper. The proposed power converter has lossless switching (whatever the line and load conditions), few components and can be operated either in voltage or current mode control. A detailed analysis of the circuit is presented and the design procedure is illustrated. A 50 W 200 kHz prototype zero voltage switching flyback power converter is built which shows an efficiency improvement of approximately 7% as compared to a conventional hard switching flyback power converter.