A Zero-Voltage-Switching Quasi-Resonant Flyback and Forward Composite DC-DC Converter

Yukihiro OHTA  Chika WATANABE  Kenzo WATANABE  

IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E85-A   No.6   pp.1209-1213
Publication Date: 2002/06/01
Online ISSN: 
Print ISSN: 0916-8508
Type of Manuscript: Special Section PAPER (Special Section on Papers Selected from 2001 International Technical Conference on Circuits/Systems, Computers and Communications (ITC-CSCC 2001))
DC-DC converter,  flyback,  forward,  ZVS,  

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A DC-DC converter using two transformers is proposed. One transformer delivers the energy to a load when a switch is on and the other transfers the flyback energy to a load when a switch is off. The primary windings of the two transformers function as choke inductance alternately, and thus the output voltage control by means of the duty ratio and the zero-voltage-switching are possible without an additional inductor. The breadboarded prototypes of the single output and the two outputs have confirmed the principles of operation and demonstrated the high conversion efficiency.