Analysis of CIC NPT IGBT's turn-off operations for high switching current level

Stéphane Lefebvre, Francis Miserey

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)


For a high switching current level during IGBT's turn-off process, the simultaneous presence of high current density and high voltage can lead to avalanche generation. A one-dimensional (1-D) analytical model describing the voltage reapplication phase is presented for snubberless turn-off operations with CIC NPT IGBT's. Without avalanche generation, voltage rate of rise dVAK/dt at turn-off remains constant. Avalanche generation is investigated on the basis of experimental measurements in combination with numerical simulations. The avalanche mechanism generates electrons in the space charge region delaying the sweeping-out process and increasing the turn-off losses. The avalanche generation can be avoided when the gate drive is slowed even though turn-off losses increase.

Original languageEnglish
Pages (from-to)1042-1049
Number of pages8
JournalIEEE Transactions on Electron Devices
Issue number5
Publication statusPublished - 1 Jan 1999
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

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