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Registered Member #105
Joined: Thu Feb 09 2006, 08:54PM
Location:
Posts: 408
Did you say you were running it on a function generator? It could be that the frequency is just a little bit off, which will cause some nasty problems.
Registered Member #151
Joined: Sun Feb 12 2006, 02:53PM
Location: Poland
Posts: 153
EastVoltResearch wrote ...
Try adding some TVS across your MOSFETs. Also, do your MOSFETs have internal diodes in them?
Yes, they do. I have fast recovery diodes in parallel with mosfets too. And also places for schottky diodes (in series with mosfets) on PCB, but unfortunately i don't have these diodes now. And I'm ashamed to ask: what is TVS?
wrote ... More primary turns?
I have 12 turns now. I guess that if it works fine @ 150V with cool mosfets this is not the problem (?)
wrote ... Did you say you were running it on a function generator? It could be that the frequency is just a little bit off, which will cause some nasty problems.
Indeed i am. I've tried an antenna feedback, just like in Steve Ward's Mini SSTC, but it doesn't work. I'm using MOS version of inverters (the 15V ones) instead of TTL version, does it matter?
Registered Member #139
Joined: Sat Feb 11 2006, 11:01AM
Location: Perth, Western Australia
Posts: 358
I would agree that it's the fact that you are essentially running it from a function generator. Try running it as a self resonant system, I think you'll fix the problem.
EDIT:
Have you connected it up to a light bulb to make sure you have the bridge set up correctly?
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[fullbridge] mosfets dying, why???
