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Registered Member #2919
Joined: Fri Jun 11 2010, 06:30PM
Location: Cambridge, MA
Posts: 652
E.TexasTesla wrote ...
Need some advise on this board. After two pairs of IRG4PC50UDs im pulling my hair out.
coil specs :
3 x 8 secondary 28 gauge wire 2 x 10 inch torid 5 turns primary wound over secondary with insulation Steve Wards universal driver
I get weak sparks for about 3 seconds with duty cycle on driver set to lowest rep. Then both igbts blow.
The last time around it blew a trace off the board. (Easternvoltage, I found a fuse of sorts LOL)
My gate signals look good at both igbts. I beleive it was around 2-3 vac.
Do you think I had a primary insulation fault? I think I will add some TVS to this circuit.
You're running possibly detuned with way too high of a resonant frequency there, plus the IRG4PC50UD has quite a bit more turn-off delay than the FGH60N60SMD. What bus voltage were you running? Also, if your gate signals were 3VAC then something is wrong. I would highly advise duplicating the specs in the first post, unless you're explicitly trying to do development work to push the design's limits.
Unrelated to this particular issue, here's a rough draft of a troubleshooting guide: Note that it's for an unreleased interrupter, but the general idea should be the same. It may or may not be perfect, but will probably be of some help. Your feedback is appreciated
Also, for you guys out there who have boards: (1) Thin wire is a must when constructing the secondary. (2) Proper shielding on the interrupter is also a must (or a really long fiber cable, at least a couple meters long) (3) Use fast IGBT's. (4) Use a variac while testing if you have one. If you don't have a variac, make sure that the GDT is phased properly; no amount of fuses can save your board if the bridge shoots through with 400V on the bus.
Registered Member #2524
Joined: Wed Dec 09 2009, 06:29AM
Location: Johns Island, South Carolina
Posts: 23
My boards arrived today. They look really nice and of excellent quality. I've been following the thread and have learned quite a bit of do's and dont's which should make assembly easier.
Registered Member #1643
Joined: Mon Aug 18 2008, 06:10PM
Location:
Posts: 1039
I love your diver man, but the MMC, shes cooking for me! 250A primary current, 120VAC input...after playing Canon the single MMC cap was 150F, my primary was 125F.
But -- I'm not complaining yet! My coil was NOT tuned. Stupid running a coil like this not tuned but hey, It's my parts! But works damn good :)
First power test after rebuild -- NOT IN TUNE -- French Can Can midi
Secodn power test after rebuild -- NOT IN TUNE -- Canon midi
Your caps are only 6ARMS and well .. Not enough for this kind of use :)
Registered Member #2919
Joined: Fri Jun 11 2010, 06:30PM
Location: Cambridge, MA
Posts: 652
technology man wrote ...
Could you ask me witch schematic/circuit programm did you use ?
Eagle
Killa-X wrote ...
I love your diver man, but the MMC, shes cooking for me! 250A primary current, 120VAC input...after playing Canon the single MMC cap was 150F, my primary was 125F.
But -- I'm not complaining yet! My coil was NOT tuned. Stupid running a coil like this not tuned but hey, It's my parts! But works damn good :)
First power test after rebuild -- NOT IN TUNE -- French Can Can midi
Secodn power test after rebuild -- NOT IN TUNE -- Canon midi
Your caps are only 6ARMS and well .. Not enough for this kind of use :)
What pulse widths are you running? I've never had problems with MMC heating running (fairly short) pulse widths. If your resonant frequency is low, you might be ringing the capacitor voltage high enough to break down the dielectric (Vpk = Ipk/(2pi*f*C))
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oneTesla - a small single-board DRSSTC
