OLTC- Fast IGBT Brick driver

["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>

Dear list (especially Terry Fritz)

I just breadboarded my new driver circuit for the IGBT bricks. It 
oscillated pretty bad at first but I soon beat some sense into it. Here is 
the schematic (including the driver and the 555 timer based pulse generator 
that I used)

http://www.scopeboy-dot-com/tesla/oltc2/brickdriver.gif

And here is a scope trace proving that it does indeed turn on/off in 0.5us 
;) The ringing is not caused by the driver circuit itself, but the gate 
capacitance resonating with the stray inductance of the wires that go from 
the driver to the brick :(

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

Finally here's a picture of the breadboard

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

Steve C.