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The Strathprints institutional repository is a digital archive of University of Strathclyde research outputs.

Strathprints serves world leading Open Access research by the University of Strathclyde, including research by the Strathclyde Institute of Pharmacy and Biomedical Sciences (SIPBS), where research centres such as the Industrial Biotechnology Innovation Centre (IBioIC), the Cancer Research UK Formulation Unit, SeaBioTech and the Centre for Biophotonics are based.

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Active snubber energy recovery circuit for series-connected IGBTs

Lim, T. C. and Williams, B. W. and Finney, S. J. (2011) Active snubber energy recovery circuit for series-connected IGBTs. IEEE Transactions on Power Electronics, 26 (7). pp. 1879-1889. ISSN 0885-8993

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Abstract

This paper presents a novel active snubber recovery circuit for series-connected insulated gate bipolar transistors (IGBTs). The proposed technique allows turnon and turnoff switching of the series IGBTs to be controlled and balanced through conventional snubber effects, but the configuration includes active circuitry to recover into the dc supply, the stored snubber energy. Detailed waveform analysis and associated mathematical equations are presented, supported by PSpice simulations. The proposed technique is practically demonstrated, at a scaled power level, on a single IGBT to illustrate the control concept and on three series-connected IGBTs to demonstrate dynamic voltage sharing.