Re: Terry's DRSSTC - Odd IGBT damage??

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: Terry Fritz <teslalist@xxxxxxxxxxxxxxxxxxxxxxx>

Well this is funny ;-))

Here are the old IGBTs:

http://hot-streamer.com/temp/DRSSTColdIGBTs.gif

I replaced them and here is how it looks now:

http://hot-streamer.com/temp/DRSSTCnewIGBTs.gif

Hahahhaaa!!  ZERO difference!!!  I spent all night cutting out four 
perfectly good IGBTs...

Ok, It's cool!!  Best not to have damaged the IGBTs in "any" case :-))  Now 
I don't have to cut into them...

I also replaced the IGBT drive boards with the newer version that fixes the 
voltage clearance problem.  That had no effect either other than making the 
board much safer.  There was a possibility the TLP250s got damaged, but I 
tried new ones last night...

So I figure it might be the "mode thing" tending to keep the output voltage 
high during turn off or I pushed the wrong button on the scope or 
something.  Whatever...  The importance of it just went WAY DOWN on my list 
of worries ;-))

So, Not much at all to ponder now ;-))

Cheers,
	
	Terry