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

Energies

Yen-Ching Wang¹  Tzung-Lin Lee¹  Fu-Ming Ni¹ 

[1] Department of Electric Engineering, National Sun Yat-sen University, Kaohsiung 80424, Taiwan;

关键词: DAB;    LiFePO4 battery;    EV charger;   

DOI  :  10.3390/en9070492

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown