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IGBT Brick hits 1200A

To: tesla-at-pupman-dot-com
Subject: IGBT Brick hits 1200A
From: "Tesla list" <tesla-at-pupman-dot-com>
Date: Mon, 12 May 2003 07:57:02 -0600
Resent-Date: Mon, 12 May 2003 07:58:10 -0600
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Original poster: "Stephen Conner by way of Terry Fritz <teslalist-at-qwest-dot-net>" <steve-at-scopeboy-dot-com>

I hooked up a test circuit for the bricks using a 10" single turn coil and 
three 0.94uF MO caps in parallel. I charged the MO caps to 600V and then 
turned the IGBT on briefly. These are the waveforms I got:

http://www.scopeboy-dot-com/tesla/oltc2/bricktestwfm.jpg

The current is about 1200A peak, that is still within the manufacturers 
ratings :( Once I get a higher voltage supply I can get it up to about 
2000A. You can see that the losses are quite high but much of this is 
probably due to the dodgy oven caps and the 0.025 ohm current shunt. Also 
check out the massive ringing due to recovery of the flywheel diode.

Here are a couple of pics of the test rig:

http://www.scopeboy-dot-com/tesla/oltc2/bricktestsetup.jpg
http://www.scopeboy-dot-com/tesla/oltc2/bricktestcloseup.jpg

Steve C.

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