Analysis and design of active clamp forward DC/DC converter with asymmetric two transformers

Conventional active clamp forward converter has narrow ZVS range of main switch. Although utilizing high magnetizing current can realize wide ZVS range, it increases the conduction loss. To solve this problem, an active clamp forward converter with asymmetric two transformers is proposed. The proposed converter has wide ZVS range without severe conduction loss by magnetizing current. It results in the proposed converter can achieve high frequency switching operation and high power conversion efficiency. The validity of the proposed converter is verified with 300W prototype converter.

[1]  Byungcho Choi,et al.  Analysis and design of a forward-flyback converter employing two transformers , 2001, 2001 IEEE 32nd Annual Power Electronics Specialists Conference (IEEE Cat. No.01CH37230).

[2]  Gun-Woo Moon,et al.  Analysis and design of phase shift full bridge converter with series-connected two transformers , 2002 .

[3]  Gun-Woo Moon,et al.  A new standby structure using multi-output full-bridge converter integrating flyback converter , 2011, 8th International Conference on Power Electronics - ECCE Asia.

[4]  Fred C. Lee,et al.  Development of a DC distributed power system , 1994, Proceedings of 1994 IEEE Applied Power Electronics Conference and Exposition - ASPEC'94.

[5]  Milan M. Jovanovic,et al.  Present and future of distributed power systems , 1992, [Proceedings] APEC '92 Seventh Annual Applied Power Electronics Conference and Exposition.

[6]  Peng Xu,et al.  Topologies and design considerations for distributed power system applications , 2001, Proc. IEEE.

[7]  F.C. Lee,et al.  Design Challenges For Distributed Power Systems , 2006, 2006 CES/IEEE 5th International Power Electronics and Motion Control Conference.

[8]  F.C. Lee,et al.  Power architecture design with improved system efficiency, EMI and power density , 2008, 2008 IEEE Power Electronics Specialists Conference.

[9]  F. Lee,et al.  Design considerations of transformer DC bias of forward converter with active-clamp reset , 1999, APEC '99. Fourteenth Annual Applied Power Electronics Conference and Exposition. 1999 Conference Proceedings (Cat. No.99CH36285).

[10]  S. Ahmed,et al.  Feed-forward frequency compensator for APWM HB flyback converter , 2011, 8th International Conference on Power Electronics - ECCE Asia.