| Title |
Development of 50kW High Efficiency Modular Fast Charger for Both EV and NEV |
| Authors |
Min-Jae Kim ; Yeon-Woo Kim ; Yos Prabowo ; Se-Wan Choi |
| DOI |
10.6113/TKPE/2016.21.5.373 |
| Keywords |
Fast charger; Modular; Vienna rectifier; Three-level dc-dc converter; High efficiency |
| Abstract |
In this paper, a 50-kW high-efficiency modular fast charger for both electric vehicle (EV) and neighborhood electric vehicle (NEV) is proposed. The proposed fast charger consists of five 10-kW modules to achieve fault tolerance, ease of thermal management, and reduce component stress. Three-level topologies for both AC?DC and DC?DC converters are employed to use 600V MOSFET, resulting in ease of component selection and increase in switching frequency. The proposed three-level DC?DC converter with coupled inductor and its hybrid switching method can reduce the circulating current under wide output voltage range. A 50-kW prototype of the proposed fast charger was developed and tested to verify the validity of the proposed concept. Experimental results show that the proposed fast charger achieves a rated efficiency of 95.2% and a THD of less than 3%. |