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Registered Member #1107
Joined: Thu Nov 08 2007, 10:09PM
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Posts: 792
AND IT WORKS!!!!! After days of trouble shooting and many discussions with Steve Ward (thanks steve) i finally got first light. There are still a number of things that need to be fixed because it is running very "unhappy" right now. I don't know how but i managed to blow the 10 amp fuse on my variac with just 30v across the buss. The igbt's also get decently hot at a low input voltage but at least, it is a start.
Banned on 3/17/2009. Registered Member #487
Joined: Sun Jul 09 2006, 01:22AM
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Posts: 617
I just noticed something about your coil you might want to consider changing. Your gdt's are located kinda far from your IGBT's and the secondary leads on them look too long to me. I have had problems with this in the past. I found it better to make the primaries of your GDT's the longer part and your secondaries shorter. You should put the cores right up on your bridge. Make both lengths as short as possible. It's bad to have either one two long but longer secondaries create more problems.
Registered Member #1107
Joined: Thu Nov 08 2007, 10:09PM
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Posts: 792
OK thanks. once i get it working well, i will mess around with gdt placement and such. Right now i think the problem is the diodes in parallell with the gate resistor are not working probably and not adding inough dead time and there is some cross conduction going on and that is why it is drawing so much current.
Banned on 3/17/2009. Registered Member #487
Joined: Sun Jul 09 2006, 01:22AM
Location:
Posts: 617
Hm, your GDT's should provide some dead time as well. Ive tried 1 ohm all the way to 10 ohms gate resistors with no problem. The diode resistor combo doesn't seem to really matter much when you're using GDT's. You should try scoping two IGBT's and see if its really cross conducting.
Registered Member #1107
Joined: Thu Nov 08 2007, 10:09PM
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Posts: 792
It works! Well this time, after making some changes i got it working very well. with 70% input voltage i got 24" and a little more tuning should get me even more. Here is a vid
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my 1st drsstc now complete.
