Active clamping on series connected free-wheel diodes through active voltage control

T.C. Lim, S.J. Finney, B.W. Williams, P. Palmer

Research output: Contribution to conferencePaper

4 Citations (Scopus)


This paper presents an active voltage control technique, for series connected freewheel diodes in bridge legs, which suppresses the oscillation due to diode snap recovery, and clamps the overshoot sustained during reverse recovery. The need to utilise passive snubbers with this active voltage control technique to overcome the shortcoming of the active clamping, is analysed. This technique allows active balancing of the reverse voltage sharing among series connected free-wheel diodes. Experimental results are presented for the suppression of the oscillation seen by the free-wheeling diodes and the active clamping of the overshoot voltage with and without passive snubbers.
Original languageEnglish
Number of pages6
Publication statusPublished - 2004
EventIEEE 35th Annual Power Electronics Specialists Conference, 2004 - Aachen, Germany
Duration: 20 Jun 2004 → …


ConferenceIEEE 35th Annual Power Electronics Specialists Conference, 2004
Period20/06/04 → …


  • oscillations
  • voltage control
  • power semiconductor diodes
  • snubbers

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