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

The Korean Institute of Power Electronics (전력전자학회)
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Design and Parallel Operation of 30 kW SiC MOSFET-Based High Frequency Switching LLC Converter With a Wide Voltage Range for EV Fast Charger

전기자동차 급속충전기용 넓은 전압 범위를 갖는 30kW급 SiC MOSFET 기반 고속 스위칭 LLC 컨버터 설계 및 병렬 운전

  • Received : 2022.01.11
  • Accepted : 2022.01.26
  • Published : 2022.04.20
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Abstract

The electrification trend of mobility increases every year due to the development of power semiconductor and battery technology. Accordingly, the development and distribution of fast chargers for electric vehicles (EVs) are in demand. In this study, we propose a design and implementation method of an LLC converter for fast chargers. Two 15 kW LLC converters are configured in parallel to have 30 kW rated output power, and the control algorithm and driving sequence are designed accordingly and verified. In addition, the improved power conversion efficiency is confirmed through zero-voltage switching (ZVS) of the LLC converter and reduction of turn-off loss through snubber capacitors. The implemented 30 kW LLC converters show a wide output voltage range of 200-950 V. Experiments applying various load conditions verify the converter performance.

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Acknowledgement

본 연구는 대진대학교 신임교수 연구정착금으로 지원되는 연구비에 의하여 수행한 과제입니다.

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