Self-precharge in single-leg flying capacitor converters

Steven Thielemans, Alex Ruderman, Jan Melkebeek

Research output: Chapter in Book/Report/Conference proceedingConference contribution

12 Citations (Scopus)


Flying Capacitor (FC) multilevel pulse width modulated (PWM) converters are an attractive choice due to the natural voltage balance property. During start-up of the converter, care has to be taken that the power switches are not exposed to voltage overstress due to uncharged capacitors. A flying capacitor self-precharge technique is proposed which, by making use of natural balancing and a DC-bus rate control, makes the capacitors balance with a zero average load current. The DC-bus rate control depends on the capacitor voltage balance dynamics. The regular PWM natural balancing technique gives good results for even-level single-leg converter self-precharge, for odd-level converters a special switching pattern is necessary.

Original languageEnglish
Title of host publicationIECON Proceedings (Industrial Electronics Conference)
Number of pages6
Publication statusPublished - 2009
Externally publishedYes
Event35th Annual Conference of the IEEE Industrial Electronics Society, IECON 2009 - Porto, Portugal
Duration: Nov 3 2009Nov 5 2009


Other35th Annual Conference of the IEEE Industrial Electronics Society, IECON 2009

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Electrical and Electronic Engineering

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