RE: IGBT Brick hits 1200A

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Mccauley, Daniel H by way of Terry Fritz <teslalist-at-qwest-dot-net>" <daniel.h.mccauley-at-lmco-dot-com>


Pretty cool set-up.  I'll definitely have to add an OLTC to my collection
once I finish some of the work I'm doing now.
Let us know how it turns out in action!

The Captain


 > 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.
 >
 >
 >