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Re: Terry's DRSSTC - Odd IGBT damage??
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- Subject: Re: Terry's DRSSTC - Odd IGBT damage??
- From: "Tesla list" <tesla@xxxxxxxxxx>
- Date: Thu, 03 Feb 2005 11:38:38 -0700
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Original poster: stork <stork@xxxxxxxxxxxxxxxxxxx>
Terry,
Your probably right about the reverse diodes. Check a good IGBT and see
what voltage the reverse diode conducts then check to see if your driver
reverse diode conducts at the same voltage or is shorted or open. Do it
with DC and also at operating frequency.
I am thinking the anti-parallel diodes have gone away. Strange since one
would think the IGBTs themselves would get beat up from tiny dead times
and fast switching rather than the separate diodes....
So I am going to switch out the set of IGBTs and see if it all returns to
normal. If so, I will have the die checked to find what blew up.
stork