Mobile QR Code QR CODE : The Korean Institute of Power Electronics
Title Development of 50kW High Efficiency Fast Charger with Wide Charging Voltage Range
Authors Jun-Sung Park ; Min-Jae Kim ; Heon-Soo Jeong ; Joo-Ha Kim ; Se-Wan Choi
DOI 10.6113/TKPE/2016.21.3.267
Page pp.267-274
ISSN 1229-2214
Keywords Fast charger; T-type three-level inverter; Three-level dc-dc converter; Hybrid switching method
Abstract In this study, a fast charger for electric vehicle with wide charging voltage range is proposed. To achieve high efficiency, three-level topologies are employed for the AC-DC and DC-DC converters. Given that the output range of the DC-DC converter in fast chargers is quite wide, the circulating current of conventional three-level converter will increase under low voltage condition. The proposed hybrid switching method mitigates this issue. When a coupled inductor is used on the output side, the circulating current is further reduced, and the switches S2, S3, S6, and S7 achieve turning-off under the ZCS condition. Experimental results from a 50 kW prototype are provided to validate the proposed charger, and a rated efficiency of 95.9% is obtained.