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Dan's ISSTCII help
- To: tesla@xxxxxxxxxx
- Subject: Dan's ISSTCII help
- From: "Tesla list" <tesla@xxxxxxxxxx>
- Date: Fri, 28 Jan 2005 22:15:03 -0700
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Original poster: Skip Greiner <sgreiner@xxxxxxxxx>
After many fits and starts I finally fired up the ISSTCII.
I sequence the startup as follows: Turn on the pulse generator which is a
remote box, Turn on the power to the driver board, lastly slowly increase
the AC voltage to the IGBT power supply. Everything seemed to be going
well. I had the IGBT DC bus voltage at about 100 volts and was varying the
pulse width and prf controls about 10% up from minimum. The arcs at this
point were well over 12" and the controls were functioning normally. After
about a minute the arcs began to decrease in intensity and I immediately
shut down the high voltage. Nevertheless the 37321 drivers fried. Right now
it does not appear that the IGBTs fried but a full investigation can not be
done until tomorrow. There are still normal drive pulses through to the
37321 sockets.
The +5, -15 and +15 supplies are all nominal. Drive pulses to the IGBTs
were about 30v. I do not have a terminating resistor at present in the base
feedback circuit.
My question to anyone with experience with Dan's unit...Has anyone
experienced this failure at such a low voltage on the IGBTs and if so did
you figure out what happened?
Thanks for any and all comments
Skip Greiner