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DRSSTC IGBT fault currents
- To: tesla@xxxxxxxxxx
- Subject: DRSSTC IGBT fault currents
- From: "Tesla list" <tesla@xxxxxxxxxx>
- Date: Sat, 04 Dec 2004 15:02:50 -0700
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- Resent-date: Sat, 4 Dec 2004 15:02:10 -0700 (MST)
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Original poster: Terry Fritz <teslalist@xxxxxxxxxxxxxxxxxxxxxxx>
Hi All,
Although there is a ton of guess work here, I tried to model the situation
in an DRSSTC where on of the IGBTs shorts:
http://hot-streamer.com/temp/DRSSTC-04-IGBTfault.gif
At 140mS, I short the top one. 1mS later the bottom one shorts:
http://hot-streamer.com/temp/DRSSTC-04-IGBTfault-out.gif
Initial current spike is 5700 amps and the power to the "remaining" IGBT
hits 1.2 MegaWatts! In the next millisecond it dissipates about 100 joules
with a ~2000 amp square wave.
Not sure if it means much, but it does give a hint at what happens when an
IGBT fails.
Cheers,
Terry