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Energies 2017, 10(7), 871; doi:10.3390/en10070871

A High-Power DC-DC Converter Topology for Battery Charging Applications

Department of Electric Engineering, Myongji Unversity, Yongin-Si 449-728, Korea
Author to whom correspondence should be addressed.
Academic Editor: Hugo Morais
Received: 9 March 2017 / Revised: 26 June 2017 / Accepted: 27 June 2017 / Published: 28 June 2017
(This article belongs to the Section Electrical Power and Energy System)


A DC-DC converter that can be applied for battery chargers with the power-capacity of over 7-kW for electric vehicles (EVs) is presented in this paper. Due to a new architecture, the proposed converter achieves a reduction of conduction losses at the primary side by as much as 50% and has many benefits such as much smaller circulating current, less duty-cycle loss, and lower secondary-voltage stress. In addition, its power handing capacity can be upsized easily with the use of two full-bridge inverters and two transformers. Besides, all the switches in the converter achieve zero-voltage switching (ZVS) during whole battery charging process, and the size of output filter can be significantly reduced. The circuit configuration, operation, and relevant analysis are presented, followed by the experiment on a prototype realized with a 7-kW charger. The experimental results validate the theoretical analysis and show the effectiveness of the proposed converter as battery charger. View Full-Text
Keywords: full-bridge converter; electric vehicle; hybrid electric vehicle; battery charger; zero-voltage-switching full-bridge converter; electric vehicle; hybrid electric vehicle; battery charger; zero-voltage-switching

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Lee, I.-O.; Lee, J.-Y. A High-Power DC-DC Converter Topology for Battery Charging Applications. Energies 2017, 10, 871.

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