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High-Frequency High-Efficiency CLL Resonant Converters With Synchronous Rectifiers

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4 Author(s)
Daocheng Huang ; Virginia Polytech. Inst. & State Univ., Blacksburg, VA, USA ; Dianbo Fu ; Lee, F.C. ; Pengju Kong

This paper proposes a CLL resonant dc-dc converter as an option for offline applications. This topology can achieve zero-voltage switching from zero load to a full load and zero-current switching for output rectifiers and makes the implementation of a secondary rectifier easy. This paper also presents a novel methodology for designing CLL resonant converters based on efficiency and holdup time requirements. An optimal transformer structure is proposed, which uses a current-type synchronous rectifier (SR) drive scheme. An 800-kHz 250-W CLL resonant converter prototype is built to verify the proposed circuit, design method, transformer structure, and SR drive scheme.

Published in:

Industrial Electronics, IEEE Transactions on  (Volume:58 ,  Issue: 8 )

Date of Publication:

Aug. 2011

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