In Reply to: Re: Series Connection of IGBTS,MosFet posted by John Dunn - Consultant on 03/15/00 at 3:20 PM:
I strongly suggest that his original concern about getting them to act synchronously will still haunt him after he overcomes the issues you raised. Turning them on might not be so bad, but turning them off could be a very interesting process!
: 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.