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Registered Member #7267
Joined: Tue Oct 16 2012, 12:16AM
Location: Detroit, Michigan
Posts: 407
Bushman wrote ...
Discovered a 10uF cap next to the regulator was installed backwards and would slowly leak causing a short.
Similar to the problem I am having now, it's confusing why the GDT would have this impact. What happens if the GDT primary is connected but the secondaries are left open? Does it still overheat?
Thanks, i will have a look at my caps and double check that. If i connect the GDT but leave the secondaries unconnected from the bridge, I don't get any problems.
Registered Member #6038
Joined: Mon Aug 06 2012, 11:31AM
Location: Salado, TX
Posts: 248
ok - so that sounds very much like the problem I am having. Problem seems to be on the H-bridge board, but the symptoms are on the resonant driver board. I have been playing with the signal generator to drive the GDT so I can see what's happening without cooking components. Will post results when I am done.
Registered Member #7267
Joined: Tue Oct 16 2012, 12:16AM
Location: Detroit, Michigan
Posts: 407
Bushman wrote ...
ok - so that sounds very much like the problem I am having. Problem seems to be on the H-bridge board, but the symptoms are on the resonant driver board. I have been playing with the signal generator to drive the GDT so I can see what's happening without cooking components. Will post results when I am done.
Well its definitely not any of my caps, they are all oriented correctly. I too messed around with the signals used to drive the GDT, tried all sorts of amplitude and duty cycle, nothing made a difference though.. I've got my eye on the GDT though, I will be rewinding it tonight to see if it makes a difference. The layout for the bridge is so simple I honestly cant see where a problem would be unless one or more of the fresh diodes I installed just so happen to be bad... I appreciate you keeping me posted on your results, I hope I will also have good news tmoro
Registered Member #6038
Joined: Mon Aug 06 2012, 11:31AM
Location: Salado, TX
Posts: 248
Likewise - interesting discussion. Learning a lot. I will be rewinding the GDT tonight as well. Lets keep fingers crossed. I just ordered two SOT-227 IGBTs to try and keep as close to the original design as possible.
Registered Member #7267
Joined: Tue Oct 16 2012, 12:16AM
Location: Detroit, Michigan
Posts: 407
The sot227 are a must, expensive but a must. I dont see it plausible to run the 247's for your minibrute type setup, they will just overheat, die, and hate you for it.
Registered Member #7267
Joined: Tue Oct 16 2012, 12:16AM
Location: Detroit, Michigan
Posts: 407
Kizmo wrote ...
I have seen problem like this before. It was caused by a design flaw in the driver. When interrupter line turns high, the driver should output drive pulse to the gate drive in order to get the primary oscillations going. Do you see this pulse at your gates?
With my old ugly controller I could see this and was not a problem. But now with the new etched PCB, I am no longer seeing this with both scope probes attached to the gate drive output and gate return, with only the interrupter on. All I'm seeing is +15v on one side and 0 on the other which is normal if the interrupter is not on. I'll have to backtrack to the FO in and see where I'm losing the signal. Question is would this be contributing to the overload of the 15V regulator when the GDT is connected..
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Primary oscillation
