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

The Korean Institute of Power Electronics (전력전자학회)
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Three-Phase ZVS DC-DC Converter with Low Transformer Turn Ratio for High Step-up and High Power Applications

낮은 변압기 턴비를 갖는 고승압.대전력용 3상 ZVS DC-DC컨버터

  • 김준근 (카코 뉴에너지(주) 선행기술연구소) ;
  • 박찬수 (서울과학기술대 제어계측공학과) ;
  • 최세완 (서울과학기술대 제어계측공학과) ;
  • 박가우 ((주)지필로스 기술연구소)
  • Received : 2010.12.14
  • Accepted : 2011.03.04
  • Published : 2011.06.20
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Abstract

The proposed converter has easy device selection for high step-up and high power applications since boost half bridge and voltage doubler cells are connected, respectively, in parallel and series in order to increase output power and voltage. Especially, optimized design of high frequency transformers is possible owing to reduced turn ratio and eliminated dc offset, and distributed power through three cores is beneficial to low profile and thermal distribution. The proposed converter does not necessitate start-up circuit and additional clamp circuit due to the use of whole duty range between 0 and 1 and is suitable for applications with wide input voltage range. Also, high efficiency can be achieved since ZVS turn on of switches are achieved in wide duty cycle range and ZCS turn on and off of diodes are achieved. The proposed converter was validated through 5 kW prototype.

제안하는 컨버터는 부스트 하프브리지-전압 더블러를 각각 병렬-직렬로 연결하여 출력전력 및 출력전압을 증대시키므로 고승압 대전력 응용에서 소자의 선정이 용이하다. 특히 고주파변압기 턴 비를 작게 할 수 있고 DC 오프셋이 제거되어 최적의 변압기 설계가 가능하며, 3개의 코아로 전력이 분배되어 Low Profile 및 열 분산에 유리하다. 제안하는 컨버터는 전 영역(0 ∼ 1)의 듀티 사용으로 스타트업 및 추가의 클램프회로가 필요 없으며 입력전압 변동이 큰 응용에 적합하다. 또한 넓은 듀티영역에서 스위치의 ZVS 턴온과 다이오드의 ZCS 턴온 턴오프가 성취되므로 고효율을 달성할 수 있다. 제안하는 컨버터를 5 kW급 시작품으로 검증하였다.

Keywords

References

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