Implementation of Soft Switching Forward Converter with Self-Driven Synchronous Rectification

Majid DELSHAD  Nasrin ASADI MADISEH  Bahador FANI  Mahmood AZARI  

IEICE TRANSACTIONS on Electronics   Vol.E98-C   No.10   pp.963-970
Publication Date: 2015/10/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E98.C.963
Type of Manuscript: PAPER
Category: Electronic Circuits
forward converter,  soft switching,  self driven synchronous rectifier,  zero-current switching (ZCS),  zero-voltage switching (ZVS),  

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In this paper, a new single soft switched forward converter with a self driven synchronous rectification (SDSR) is introduced. In the proposed converter, a soft switching condition (ZCS turn on and ZVS turn off) is provided for the switch, by an auxiliary circuit without any extra switch. In additional, this auxiliary circuit does not impose high voltage or current stresses on the converter. Since the proposed converter uses SDSR to reduce conductive loss of output rectifier, the rectifier switches are switched under soft switching condition. So, the conductive and switching losses on the converter reduce considerably. Also, implementing control circuit of this converter is very simple, due to the self-driven method employed in driving synchronous rectification and the converter is controlled by pulse width modulation (PWM). The experimental results of the proposed converter are presented to confirm the theoretical analysis.