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

Title
DC-DC Boost Converter의 스위칭 손실 저감을 위한 Passive Snubber 연구
Authors
최형진
Date Issued
2014
Publisher
포항공과대학교
Abstract
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.
URI
http://postech.dcollection.net/jsp/common/DcLoOrgPer.jsp?sItemId=000001736864
http://oasis.postech.ac.kr/handle/2014.oak/2266
Article Type
Thesis
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