RE: IGBT Brick hits 1200A

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

Original poster: "Stephen Conner by way of Terry Fritz <teslalist-at-qwest-dot-net>" <steve-at-scopeboy-dot-com>

At 18:57 17/05/03 -0600, you wrote:
>Original poster: "Greg Leyh by way of Terry Fritz <teslalist-at-qwest-dot-net>" 
><lod-at-pacbell-dot-net>

snip


>The ringing appears to be caused by the fact that the IGBT
>is trying to turn off during the haversine when the IGBT elements
>are conducting current.  I would think that turning the IGBT off
>about 2uS earlier [during the diode haversine] would accomplish
>smoother commutation.

As far as I can tell, it _is_ being turned off during the diode conduction 
period. The ringing is just the diode recovery transient.

I'll recheck that, but I think if I _had_ been turning it off while the 
IGBT was passing current, with no snubber, I would have blown something.

Steve C.