Characterization of a 6.5kV IGBT for medium-voltage high-power resonant DC-DC converter

Medium-voltage (MV) high-power converters are usually realized using high-voltage semiconductors (3.3kV, 4.5kV or 6.5kV) operated with low-switching frequencies in the range of several hundred Hz and under hard-switching conditions. However, for medium-voltage high-power DC-DC converters employing transformer for galvanic isolation, it is attractive to increase switching frequency in order to reduce the transformer size. Therefore, it is usually required to consider the use of some sort of soft-switching method. Recently, DC-DC LLC resonant converters are gaining momentum, but are usually considered for low-voltage applications utilizing unipolar devices (MOSFETS). In this paper, switching properties of a medium-voltage bipolar semiconductor (6.5kV IGBT) are analyzed for a high-power LLC resonant converter. Experimental results are presented to illustrate the characteristic operating conditions, highlighting interactions between semiconductors and circuit properties, which both must be simultaneously considered, in order to achieve best utilization of a high-voltage semiconductor operating at higher switching frequencies.

Published in:
2013 Twenty-Eighth Annual IEEE Applied Power Electronics Conference and Exposition (APEC), 1438-1444
Presented at:
2013 IEEE Applied Power Electronics Conference and Exposition - APEC 2013, Long Beach, CA, USA, 17-21 03 2013

Note: The status of this file is: EPFL only

 Record created 2014-04-10, last modified 2018-09-13

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