A simple and efficient synchronous rectifier for forward DC-DC converters

A simple and efficient MOSFET synchronous rectification circuit suitable for forward DC-DC power converters is proposed. The main feature of this circuit is the addition of a capacitor in parallel with the drain source of the MOSFET used as a rectifying device. This capacitor extends the conduction period of the MOSFET used as a freewheeling device. As a result, a 92% efficiency at 5 V for 10 A output is achieved.<<ETX>>

[1]  T. Yachi,et al.  A high-efficiency 30 W board mounted power supply module , 1991, [Proceedings] Thirteenth International Telecommunications Energy Conference - INTELEC 91.

[2]  J. Blanc.  Practical application of MOSFET synchronous rectifiers , 1991, [Proceedings] Thirteenth International Telecommunications Energy Conference - INTELEC 91.

[3]  F.C. Lee,et al.  A MOSFET resonant synchronous rectifier for high-frequency DC/DC converters , 1990, 21st Annual IEEE Conference on Power Electronics Specialists.

[4]  H. Yoshida,et al.  Power MOSFET for Switching Regulator , 1982, INTELEC '82 - International Telecommunications Energy Conference.

[5]  N. Murakami,et al.  Analysis of a resonant reset condition for a single-ended forward converter , 1988, PESC '88 Record., 19th Annual IEEE Power Electronics Specialists Conference.