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Analysis, Design, and Implementation of a Parallel ZVS Converter

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3 Author(s)
Bor-Ren Lin ; Nat. Yunlin Univ. of Sci. & Technol., Yunlin ; Chien-Lan Huang ; Jin-Fa Wan

A soft-switching converter is presented in this paper to achieve a zero-voltage-switching (ZVS) turn on for all switches. Two half-bridge converters with asymmetric pulsewidth-modulation scheme are connected in parallel to control the output voltage at the desired value and achieve load-current sharing. Based on the output capacitance of power switches and the resonant inductance, including the external inductance and the transformer leakage inductance, the resonance can be achieved at the transition interval of power switches. Therefore, the ZVS turn on of power switches can be realized. The peak voltage of the power switches is limited to input dc voltage. The center-tapped rectifier is adopted at the transformer secondary side to achieve a full-wave rectification. Operation principles, steady-state analysis, and design equations of the proposed converter are discussed in detail. Finally, experimental results based on a 240-W prototype are provided to verify the performance and the feasibility of the proposed converter.

Published in:

Industrial Electronics, IEEE Transactions on  (Volume:55 ,  Issue: 4 )

Date of Publication:

April 2008

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