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

The Korean Institute of Power Electronics (전력전자학회)
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An Improved ZVS Active Clamp Forward Converter

개선된 영전압 스위칭 액티브 클램프 포워드 컨버터

  • 최선호 (동아일렉콤㈜) ;
  • 이현관 (전주대 대학원 전기전자공학과) ;
  • 김은수 (전주대 전기전자정보통신공학부)
  • Published : 2005.06.01
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Abstract

We propose an improved active forward converter by adding a non-dissipative snubber circuit to the secondary of the conventional active clamp forward converter in this paper. The snubber circuit is composed of a tapped inductor, a snubber capacitor, and two diodes. Comparing with the conventional one, the proposed one makes it possible ZVS to operate in a smaller magnetizing current condition. The operational principles and the equivalent mode analysis of an improved active forward converter are mentioned in this paper. In conclusion, we constructed the prototype of the modified active forward converter with 300W output capacity and verified higher efficiency compared to the conventional one.

본 논문에서는 액티브 클램프 포워드컨버터 2차 측에 탭-인덕터와 스너버 커페시터, 두 개의 다이오드로 구성된 무손실 스너버를 적용한 개선된 액티브클램프 포워드컨버터를 제안하였고, 종래의 컨버터와 비교하여 제안된 컨버터가 보다 적은 자화전류조건에서도 영전압 스위칭(ZVS)이 가능함을 보였다. 제안된 컨버터의 동작원리 및 모드를 분석하였고, 300W출력용량의 컨버터 시제품을 제작 실험하여 제안된 컨버터의 효율특성이 개선됨을 보였다.

Keywords

References

  1. Q. Li, F. C. Lee: 'Design Consideration of the Active-Clamp Forward Converter with Current Mode Control during Large-Signal Transient', Applied Power Electronics Conference '2000, pp. 966-972
  2. Q. Li, F. C. Lee, and M. M Jovanovic, 'Design Consideration of Transformer DC Bias of Forward Converter with Active-Clamp Reset', IEEE APEC, pp.553-559, 1999
  3. D. H. Park, H. j. Kim, and Y. S. Sun, 'A Development of the off-line Active Clamp ZVS Forward Converter for Telecommunication Applications', IEEE Intelec 1997, pp. 271-276
  4. G.C. Hua, W.A. Tabise, C.S. Leu, N. Dai, R. Watson, F.C. Lee: 'Development of a DC Distributed Power System', Applied Power Electronics Conference '94, pp. 763-769
  5. S. Hamada, M. Michihira, M. Nakaoka, 'Using A Tapped Inductor for Reducing Conduction Losses in a Soft Switching PWM DC-DC converter', EPE, 1993, pp. 130-134
  6. E.S Kim, B.Y Byun, Y.H Kim, Y.G Hong, 'A Three Level ZVZCS Phase-Shifted DC/DC Converter Using A Tapped Inductor And A Snubber Capacitor', APEC 2001. 3, pp. 980-985
  7. 최선호, 박진영, 김은수, '300W 평면변압기적용 포워드 컨버터', 전력전자학회논문지 제9권 6호, pp.560-567, 2004. 12