Series connection of snubberless IGBTs for 6.6 kV transformerless converters

Naotaka Okada, Masahiro Takasaki, Jim Narushima, Ryohei Miyagawa, Shuji Katoh

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


We developed a 6.6-kV 1-MVA transformerless converter making use of a snubberless insulated gate bipolar transistor (IGBT) 8-series connection using an Active-Gate-Control. The Active-Gate-Control can balance the collector voltage of IGBTs connected in series enabling the IGBT series connection. It allows the converter to output a high enough AC voltage to directly connect to 6.6-kV distribution lines. Therefore, the converter does not need a step-up and step-down transformer, and is extremely small and compact.

Original languageEnglish
Pages (from-to)874-879+2
JournalIEEJ Transactions on Industry Applications
Issue number7
Publication statusPublished - 2008


  • Active-gate-control
  • Series connection
  • Snubberless
  • Transformerless


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