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Date: 03/15/00 at 9:39 AM
Posted by: John Dunn - Consultant
E-mail: ambertec@ieee.org

In Reply to: Series Connection of IGBTs, MosFet posted by Holger Cecchin on 03/15/00 at 2:04 AM:

Hi, Holger.

Putting multiple devices in series for high voltage switching is one tricky business indeed! The upper switch(es) would have to have their drive signals floating on a switched common-mode high voltage signal and yet not be corrupted by that. Also, all of the turn-off dV/dT's would have to be balanced by snubber networks to keep from transiently exceeding the voltage standoff capability of one or another of the stacked devices.

Given these difficulties, I would strongly suggest that you get in touch with vendors of the proposed devices, such as International Rectifier let's say, and see what they would advise!

Good luck.

John Dunn - President
Ambertec, Inc.
ambertec@ieee.org

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