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Subject: Re: Series Connection of IGBTS,MosFet

Date: 03/15/00 at 3:20 PM
Posted by: John Dunn - Consultant
E-mail: ambertec@ieee.org
Message Posted:

In Reply to: Series Connection of IGBTS,MosFet posted by Holger Cecchin on 03/15/00 at 2:02 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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