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Energies 2016, 9(7), 492; doi:10.3390/en9070492

Hybrid Modulation of Bidirectional Three-Phase Dual-Active-Bridge DC Converters for Electric Vehicles

Department of Electric Engineering, National Sun Yat-sen University, Kaohsiung 80424, Taiwan
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Author to whom correspondence should be addressed.
Academic Editors: Frede Blaabjerg and Dirk Söffker
Received: 9 March 2016 / Revised: 17 May 2016 / Accepted: 23 June 2016 / Published: 27 June 2016
(This article belongs to the Special Issue Power Management for Hybrids and Vehicle Drivetrains)
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Abstract

Bidirectional power converters for electric vehicles (EVs) have received much attention recently, due to either grid-supporting requirements or emergent power supplies. This paper proposes a hybrid modulation of the three-phase dual-active bridge (3ΦDAB) converter for EV charging systems. The designed hybrid modulation allows the converter to switch its modulation between phase-shifted and trapezoidal modes to increase the conversion efficiency, even under light-load conditions. The mode transition is realized in a real-time manner according to the charging or discharging current. The operation principle of the converter is analyzed in different modes and thus design considerations of the modulation are derived. A lab-scaled prototype circuit with a 48V/20Ah LiFePO4 battery is established to validate the feasibility and effectiveness. View Full-Text
Keywords: DAB; LiFePO4 battery; EV charger DAB; LiFePO4 battery; EV charger
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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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Wang, Y.-C.; Ni, F.-M.; Lee, T.-L. Hybrid Modulation of Bidirectional Three-Phase Dual-Active-Bridge DC Converters for Electric Vehicles. Energies 2016, 9, 492.

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