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An Active-Clamp Push–Pull Converter for Battery Sourcing Applications

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5 Author(s)
Tsai-Fu Wu ; Dept. of Electr. Eng., Nat. Chung Cheng Univ., Chung Cheng ; Hung, J.-C. ; Tsai, J.-T. ; Tsai, C.-T.
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This paper presents an active-clamp push-pull converter for battery sourcing applications. A pair of auxiliary switches, resonant inductors, and clamping capacitors is added to the primary side of the transformer to clamp voltage spike and recycle the energy trapped in the leakage inductors. In the proposed active-clamp push-pull converter, since both main and auxiliary switches can be turned on with zero-voltage switching, switching loss can be reduced and conversion efficiency therefore can be improved significantly. Furthermore, the proposed converter can eliminate potential flux-imbalance problems existing in the conventional push-pull converter. In this paper, a 1 kW active-clamp push-pull converter was implemented, from which experimental results have shown that efficiency improvement and surge suppression can be achieved effectively. It is relatively feasible for applications to battery sourcing converters.

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Industry Applications, IEEE Transactions on  (Volume:44 ,  Issue: 1 )