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DC-DC Boost Converter의 스위칭 손실 저감을 위한 Passive Snubber 연구 원문보기

  • 저자

    최형진

  • 학위수여기관

    포항공과대학교 일반대학원

  • 학위구분

    국내박사

  • 학과

    전자전기공학과

  • 지도교수

    강봉구

  • 발행년도

    2014

  • 총페이지

    72 p.

  • 키워드

  • 언어

    eng

  • 원문 URL

    http://www.riss.kr/link?id=T13533393&outLink=K  

  • 초록

    This thesis presents a passive snubber for MOSFET and IGBT in a dc-dc boost converter. The snubber consists of one inductor, two capacitors, and two diodes. It improves the power-conversion efficiency significantly by providing zero-current turn-on and zero-voltage turn-off conditions for a switch, without increasing the voltage stress of a switch. When the snubber was adapted to the conventional dc-dc boost converter and tested at an output power of 300 W and a switching frequency of 180 kHz, the current noise level of input current decreased by ~ 30 dB at a frequency range of 2.5 MHz – 48 MHz, and the power-conversion efficiency increased by ~ 7.5 % for both MOSFET and IGBT switches. Also, the temperature of switch was stabilized at ~ 60 °C, while the IGBT failed in the conventional boost converter. These experimental results show that the proposed snubber is useful for solving the reliability problem of boost converters.


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