Active Snubber Circuit for High Power Inverter Leg

Tonny Wederberg Rasmussen, Morten Holst Johansen

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review


Abstract— High power converters in the conventional 6 pulse configuration with 6 switching elements IGBTs (Insulated Gate Bipolar Transistor) are pushed to the limit of power. Especially the switching loss is high. This reduces the switching frequency due to cooling problems. Passive snubber circuits have been introduced to reduce the loss even though some of the loss is removed from the IGBT to the snubber resistance. This paper takes also the next step to introduce the active Undeland snubber which in principle is lossless. The paper describes this solution together with some simulations indicating that the switching loss is reduced. Comparison between hard switched, passive and active snubber is done.
Original languageEnglish
Title of host publicationNordic Wind Energy Conference 2009 : Future Energy
Publication date2009
Publication statusPublished - 2009
EventNordic Wind Energy Conference 2009 : Future Energy -
Duration: 1 Jan 2009 → …
Conference number: 5


ConferenceNordic Wind Energy Conference 2009 : Future Energy
Period01/01/2009 → …


  • switching loss
  • IGBT
  • snubber circuits

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