The Transactions of the Korean Institute of Power Electronics (전력전자학회논문지)

The Korean Institute of Power Electronics (전력전자학회)
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A New DC-DC Converter Topology For High-Efficiency Electric Vehicle Rapid Chargers

전기전동차 급속충전기 고효율화를 위한 새로운 DC-DC 컨버터 토폴로지

  • Kim, Jin-Hak (Dept. of Electrical Engineering, Myongji University) ;
  • Lee, Woo-Seok (Dept. of Electrical Engineering, Myongji University) ;
  • Choi, Seung-Won (Dept. of Electrical Engineering, Myongji University) ;
  • Lee, Jun-Young (Dept. of Electrical Engineering, Myongji University) ;
  • Lee, Il-Oun (Dept. of Electrical Engineering, Myongji University)
  • Received : 2018.01.31
  • Accepted : 2018.02.28
  • Published : 2018.06.20
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Abstract

LLC resonant converters or phase-shift full-bridge converters have been widely used as DC - DC converters for rapid charging of electric vehicles (EVs). However, these converters present critical disadvantages, including a large circulating current, which can hinder efficiency and miniaturization in EV battery charger applications. In this paper, a new DC - DC converter topology is proposed for EV rapid chargers. The proposed converter can operate at high frequency despite a high rated power capacity of over 20kW, and the problem of circulating current can be minimized during the entire battery charging time. Owing to these advantages, the proposed converter can achieve a high conversion efficiency of over 97% for EV rapid charger applications. The performance of the proposed converter is verified with 20kW prototypes in this study.

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References

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