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Improving GTO thyristor reliability by use of linear MOSFET amplifiers and controlled avalanching in gate drive circuits

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2 Author(s)
Johnson, C.M. ; Cambridge Univ., UK ; Palmer, P.R.

The controlled linear amplifier described has been shown to provide safe and reliable gate turn-off waveforms which may be easily adapted to the circuit conditions. The low impedance coaxial gate connections enhance the performance of the circuit and allow a greater degree of control than is possible using standard wired arrangements. For large GTOs, where the turn-off current may be in excess of 3000 A, both the coaxial connections and a controlled turn-off circuit are desirable for reliable operation. Device reliability and uniform turn-off over the whole silicon area can be ensured by use of gains lower than those typically specified in manufacturers data sheets. With turn-off gains of less than one, true snubberless performance is possible with no risk to the device

Published in:

Power Electronics and Variable-Speed Drives, 1991., Fourth International Conference on

Date of Conference:

17-19 Jul 1990