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

The Korean Institute of Power Electronics (전력전자학회)
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Mathematical Analysis of LLC Series Resonant Converter with Current Doubler Rectifier using Coupled Inductor

Coupled Inductor를 활용한 배전류 정류 회로를 적용한 LLC 직렬 공진 컨버터의 수식화 해석

  • Shin, Jung-Yoon (Dept. of Control & Instrumentation Engineering, Korea Nat'l Univ of Transportation) ;
  • Hwang, Soon-Sang (Power Research Lab. DongAh Elecomm) ;
  • Yoon, Byung-Chul (Power Research Lab. DongAh Elecomm) ;
  • Kim, Hag-Wone (Dept. of Control & Instrumentation Engineering, Korea Nat'l Univ of Transportation) ;
  • Cho, Kwan-Yuhl (Dept. of Control & Instrumentation Engineering, Korea Nat'l Univ of Transportation)
  • Received : 2014.03.10
  • Accepted : 2014.08.28
  • Published : 2014.10.20
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Abstract

This study proposes an LLC series resonant converter with a current doubler using a coupled inductor as a rectification circuit for the secondary side. The current doubler circuit is generally used for a high-voltage input and low-voltage output circuit to obtain high efficiency with small transformer turn ratio. However, an inductive circuit is not generally used in the secondary side of an LLC series resonant converter. If inductive components exist on the secondary side, the resonant characteristics are changed through the secondary inductive circuit. Mathematical analysis shows that the secondary-side current doubler with coupled inductor is not affected by the resonant characteristic of the primary LLC if leakage inductance occurs in the coupled inductor. Results of the analysis are proven by simulation; an experiment is also conducted for the proposed circuit.

Keywords

Acknowledgement

Supported by : 한국연구재단

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