This paper presents a novel asymmetrical half bridge flyback converter with synchronous rectifier. To achieve a higher efficiency and a lower switching stresses than a conventional topology, the proposed APWM flyback converter can achieve ZVS operation of the power switches, and ZCS operation on output rectifier using MOSFET switch. In addition, its simple configuration enables the cost to be reduced with the smallest number of components. In this paper, analytical approach and proposed design guide are also described. A 12V/20A prototype has been implemented to verify the proposed topology and theoretical operation under full load condition.I.

No abstract