• Title/Summary/Keyword: Buck-boost isolated converter

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A Bidirectional Three-phase Push-pull Zero-Voltage Switching DC-DC Converter (양방향 3상 푸쉬풀 ZVS DC-DC 컨버터)

  • Kwon, Min-Ho;Han, Kook-In;Park, Jung-Sung;Choi, Se-Wan
    • The Transactions of the Korean Institute of Power Electronics
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    • v.18 no.4
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    • pp.403-411
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    • 2013
  • This paper proposes an isolated bidirectional three-phase push-pull dc-dc converter for high power application such as eco-friendly vehicles, renewable energy systems, energy storage systems, and solid-state transformers. The proposed converter achieves ZVS turn-on of all switches and volume of passive components is small by an effect of three-phase interleaving. The proposed converter has identical switching pattern for both boost and buck mode, and therefore can provide seamless characteristic at the mode transition. A 3kW prototype of the proposed converter has been built and tested to verify the validity of the proposed operation.

Boost converters including PV system with Differential power processor applying Isolated type buck converter (절연형 벅 컨버터가 적용된 승압형 태양광 피드백 차동전력조절기)

  • Lee, Chun-Gu;Park, Joung-Hu
    • Proceedings of the KIPE Conference
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    • 2016.07a
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    • pp.347-348
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    • 2016
  • 본 논문에서는 차동전력조절기회로가 적용된 승압형 태양광 차지펌프 플라이백 전하 균등화 회로를 사용하여 연속 모드로 동작하는 전하 균등화 방법을 제안한다. 이 컨버터는 차동전력조절기회로의 입력부에 커패시터가 병렬로 연결되어 있어서 포워드 컨버터가 아닌 벅 컨버터로 동작을 한다. 이로 인하여 기존 포워드 컨버터가 갖고 있는 동작 한계점을 극복할 수 있다. 즉 차동전력조절기회로의 듀티 비가 부스트 회로의 듀티 비 보다 작을 필요가 없다. 또한 실제 현장에 적용할 때 문제가 되는 긴 라인으로 인한 기생 인덕턴스 발생 시 차동전력조절기회로의 스위치에 큰 스파이크가 발생 할 수 있는데 이를 커패시터가 흡수하는 장정을 갖는다.

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Isolated bidirectional DC-DC Converter for low voltage battery charger (저전압 배터리 충전용 절연형 양방향 DC-DC 컨버터)

  • Jeong, Dong-Keun;Ryu, Myung-Hyo;Baek, Joo-Won;Kim, Hee-Je
    • Proceedings of the KIPE Conference
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    • 2013.07a
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    • pp.198-199
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    • 2013
  • 본 논문은 군용 UPS 시스템에서 Dual Active Bridge(DAB) 컨버터를 이용한 절연형 양방향 배터리 충전기를 제안한다. 일반적인 군용 UPS 시스템은 AC-DC 정류기, DC-AC 인버터, 양방향 DC-DC 컨버터, 배터리 충전기, 배터리로 구성되며, 여러 부하상태들에 대한 지속적인 전력공급을 위하여 안정적인 에너지 저장 시스템이 요구된다. 다양한 양방향 DC-DC 컨버터들 중, DAB 컨버터는 buck, boost 동작이 가능한 고효율 절연형 양방향 컨버터이다. 본 논문에서는 6kW(입력 380Vdc, 출력 32/21Vdc) DAB 컨버터에 대한 토폴로지 분석하고, 파라미터 및 제어 알고리즘 설계를 제안하고 시제품을 통해 이를 검증하였다.

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A Study on OBC Integrated 1.5kW LDC Converter for Electric Vehicle. (전기자동차용 OBC 일체형 1.5kW급 LDC 컨버터에 대한 연구)

  • Kim, Hyung-Sik;Jeon, Joon-Hyeok;Kim, Hee-Jun;Ahn, Joon-Seon
    • The Journal of Korea Institute of Information, Electronics, and Communication Technology
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    • v.12 no.4
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    • pp.456-465
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    • 2019
  • PHEV(Plug in Hybrid Electric Vehicle) and BEV(Battery Electric Vehicle) equip high voltage batteries to drive motor and vehicle electric system. Those vehicle require OBC(On-Board Charger) for charging batteries and LDC(Low DC/DC Converter) for converting from high voltage to low voltage. Since the charger and the converter actually separate each other in electrical vehicles, there is a margin to reduce the vehicle weight and area of installation by integration two systems. This paper studies a 1.5kW LDC converter that can be integrated into an OBC using an isolated current-fed converter by simplifying the design of LDC transformers. The proposed LDC can control the final output voltage of the LDC by using a fixed arbitrary output voltage of the bidirectional buck-boost converter, so that Compared to the existing OBC-LDC integrated system, it has the advantage of simplifying the transformer design considering the battery voltage range, converter duty ratio and OBC output turn ratio. Prototype of the proposed LDC was made to confirm normal operation at 200V ~ 400V input voltage and maximum efficiency of 91.885% was achieved at rated load condition. In addition, the OBC-LDC integrated system achieved a volume of about 6.51L and reduced the space by 15.6% compared to the existing independent system.