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http://dx.doi.org/10.6113/TKPE.2016.21.3.267

Development of 50kW High Efficiency Fast Charger with Wide Charging Voltage Range  

Park, Jun-Sung (Korea Automotive Technology Institute)
Kim, Min-Jae (Dept. of New Energy Eng., Seoul Nat'l Univ. of Science and Technology)
Jeong, Heon-Soo (ADT)
Kim, Joo-Ha (VCTech)
Choi, Se-Wan (Dept. of Electrical & Information Eng., Seoul Nat'l Univ. of Science and Technology)
Publication Information
The Transactions of the Korean Institute of Power Electronics / v.21, no.3, 2016 , pp. 267-274 More about this Journal
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 $S_2$, $S_3$, $S_6$, and $S_7$ 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.
Keywords
Fast charger; T-type three-level inverter; Three-level dc-dc converter; Hybrid switching method;
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