IEICE Electronics Express
Online ISSN : 1349-2543
ISSN-L : 1349-2543
Improved soft switching dual switch forward converter
Jinbin Zhao
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2007 Volume 4 Issue 11 Pages 363-368


An improved soft switching dual-switch forward converter topology is proposed in this paper. Compared with conventional dual-switch forward converter, the proposed converter employs an auxiliary switch and a clamp capacitor to instead of two reset diodes. Therefore, its duty cycle can exceed 0.5 to achieve wide range input voltage, also soft switching can be achieved for all switches. Especially, voltage stress across main switches can be clamped at 1/2Vin, voltage stress across auxiliary switch can be clamped at Vin. In addition, due to clamp capacitor series with the transformer, duty ratio can be extended with equation Vo = {Vin(1-D)D}/N. Thus, as a kind of better cost-effective approach, it is very attractive for high input, wide range and high efficiency application.

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© 2007 by The Institute of Electronics, Information and Communication Engineers
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