A new sepic-flyback converter

In this paper, a new sepic-flyback converter has been proposed, which is suitable for buck-boost topology. The proposed converter is superposition of sepic converter mode and flyback converter mode. Not only sepic mode output but also flyback mode output can be fully regulated by constant frequency PWM control. Merging sepic and flyback topology can share the transformer and power MOSFET. A new converter has outstanding advantages over the conventional dc-dc converters with respect to high efficiency, high power density, and component utilization. The operation principle of the proposed converter is described and verified by simulation and experimental result. Also this paper presents novel circuit and simulation result of new active sepic-flyback converter.