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

Yen-Ching Wang, Fu-Ming Ni and Tzung-Lin Lee
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Yen-Ching Wang: Department of Electric Engineering, National Sun Yat-sen University, Kaohsiung 80424, Taiwan
Fu-Ming Ni: Department of Electric Engineering, National Sun Yat-sen University, Kaohsiung 80424, Taiwan
Tzung-Lin Lee: Department of Electric Engineering, National Sun Yat-sen University, Kaohsiung 80424, Taiwan

Energies, 2016, vol. 9, issue 7, 1-13

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 (3?DAB) 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 LiFePO 4 battery is established to validate the feasibility and effectiveness.

Keywords: DAB; LiFePO 4 battery; EV charger (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2016
References: View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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