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

The Korean Institute of Power Electronics (전력전자학회)
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A Study on Full Bridge and Half Bridge Mode Transition Method of LLC Resonant Converter for Wide Input and Output Voltage Condition

넓은 입출력 전압을 위한 LLC 공진형 컨버터의 풀 브리지-하프 브리지 모드 변환 기법 연구

  • Choe, Min-Yeong (Jeju Division, Sustainable Technology and Wellness R&D Group, Korea Institute of Industrial Technology) ;
  • Baek, Seung-Woo (Dept. of Electronic Engineering, Korea Nat'l Univ. of Transportation) ;
  • Kim, Hag-Wone (Dept. of Electronic Engineering, Korea Nat'l Univ. of Transportation) ;
  • Cho, Kwan-Yuhl (Dept. of Electronic Engineering, Korea Nat'l Univ. of Transportation) ;
  • Kang, Jeong-Won (Dept. of Transportation System Enginnering, Korea National University of Transportation)
  • Received : 2021.12.31
  • Accepted : 2022.01.24
  • Published : 2022.08.20
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Abstract

This paper presents a mode transition method that applies frequency compensation technique of an LLC resonant converter for stable mode transition. LLC resonant converters used in various applications require high efficiency and high power density. However, because of circuit property, a wider voltage gain range equates to a greater circuit loss, so maintaining high efficiency at all voltage gain ranges is difficult. In this case, full bridge-half bridge mode transition method can be used, which maintains high efficiency even in a wide voltage gain range. However, this method causes damage to the circuit through overcurrent by the mode transition. This study analyzes the cause of the problem and proposes a mode transition method that applies frequency compensation technique to solve the problem. The proposed method verifies the stable transition through simulation analysis and experimental results.

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Acknowledgement

본 연구는 2021년 정부(교육부)의 재원으로 한국연구재단의 기초연구사업의 지원을 받아 수행되었음. (NRF-2021R1I1A303830111) 본 연구는 국토교통부/국토교통과학기술진흥원의 지원으로 수행되었음. (No.22QPWO-C158106-03)

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