Abstract

It is promising to achieve zero vehicular emissions by electricity-driven vehicles, and impressive development has been reported. Nevertheless, driving range anxiety is a long-standing issue that hinders the further public acceptance of electric vehicles (EVs). The issue is mainly caused by the driving range per full charge and long charging time, which can be addressed by increasing the charging power of EV batteries, leading to ultra-rapid DC chargers and high-voltage EV batteries. This paper is aimed to investigate the EV charging time with an ultra-rapid DC charger and 800-V battery. A two-stage charging system is first developed, including an active front-end AC-DC converter, three-phase dual active-bridge (3p-DAB), and associated controllers. The operation principles of 3p-DAB are derived with details. Then, the charging system is realized on a real-time simulator, and impacts of the charging current setting are investigated on the EV battery voltage, charging current, and charging power. Based on real-time simulation results, recharging times with different charging current settings are analyzed and compared with details. Finally, the paper is concluded with findings on the relationship between charging current, battery SoC, and total charging time.

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