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Registered Member #1951
Joined: Sun Feb 01 2009, 01:59PM
Location:
Posts: 105
hi, I have build steve's mini sstc and i worked fine till now. it's a mosfet killing machine. i don't know what i'm doing wrong. it run's for a few seconds then die's. also I hear sound coming from the primary. but i can't find any coal or burn marks. made a vid about the problem.
Registered Member #618
Joined: Sat Mar 31 2007, 04:15AM
Location: Us-Great Lakes
Posts: 628
Check your waveform out of the GDT, and check your DC blocking caps. You're getting shoot through and it's frying your fets, by turning them both on at teh same time, I'm pretty sure everyone including myself has had this issue, with Steves design, its not a bad design its just very sensitive.
Registered Member #1403
Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968
I understand from your video that you power this coil up instantly at full power?
If this is the case, it might just be that your secondary/topload setup is not suitable for full voltage, I have tried this before where I changed the topload to a smaller topload, thus raising the Fres, higher stress on the FETs which blew up.
I recommend lowering the Fres and use a variac to power your coil at reduced voltage, raising the voltage slowly gives you a better chance of finding and correcting problems before it goes boom...
Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
R v.d. Tuuk wrote ...
Mads Barnkob wrote ...
Where are your heatsinks on the FETs?
in the cover of the box, uh never needed it in interrupter mode.
so, i am gonna try a bigger top load, and gonna scope the gdt output.
how am i gonna scope the output, when the coil is running or just the output from the interrupter?
ow and sadly i don't have a variac
Let me get this straight, you admit your mosfets are just hanging like that without any heatsink on them, and you wonder why they blow up after few seconds of CW operation?
Registered Member #1951
Joined: Sun Feb 01 2009, 01:59PM
Location:
Posts: 105
Marko wrote ...
R v.d. Tuuk wrote ...
Mads Barnkob wrote ...
Where are your heatsinks on the FETs?
in the cover of the box, uh never needed it in interrupter mode.
so, i am gonna try a bigger top load, and gonna scope the gdt output.
how am i gonna scope the output, when the coil is running or just the output from the interrupter?
ow and sadly i don't have a variac
Let me get this straight, you admit your mosfets are just hanging like that without any heatsink on them, and you wonder why they blow up after few seconds of CW operation?
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sstc trouble. (killing mosfet's and more)
