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Registered Member #639
Joined: Wed Apr 11 2007, 09:09PM
Location: The Netherlands, Herkenbosch
Posts: 512
Did you measure the output voltage of the doubler whilst the coil was running. Looking at the coils output I'd say it was sagging under load. Awesome coil. Hope you'll keep throwing bigger and bigger arcs without blowing anything up
Registered Member #1143
Joined: Sun Nov 25 2007, 04:55PM
Location: Vilnius, Lithuania
Posts: 721
Ok, i don't know why but my bridge just blow away. so i get new parts for bridge, it will look like Finn bridge, just more caps, and SS driver for IGBT
Registered Member #1143
Joined: Sun Nov 25 2007, 04:55PM
Location: Vilnius, Lithuania
Posts: 721
Dalus wrote ...
Shame your last bridge blew.
it was running 300us and 500Bps, 3-Phase, coil was literally arcing ( like Jacob's Ladder ) to ground, and sparks even at day was very bright. Investigation was unsuccessful, because i have one jammed power Fet in IGBT driver, also powers supply channel for this driver is not working now, noticeable high current pass marks to power supply between both low sides IGBT. (it look like explosion force some how let +HV flow to IGBT driver's) And it was two explosions, one small, and after second big one in right side IGBT
Registered Member #1643
Joined: Mon Aug 18 2008, 06:10PM
Location:
Posts: 1039
Nice to see an inside of an IGBT module! Looks like you put a bit of power into it... Project looks like it's coming along good, nice work =D. Any set-goal to have it finished..?
Registered Member #2481
Joined: Mon Nov 23 2009, 03:07PM
Location: ITALY
Posts: 134
Linas wrote ...
it was running 300us and 500Bps, 3-Phase, coil was literally arcing ( like Jacob's Ladder ) to ground, and sparks even at day was very bright.
Well, 300us ON and 500 BPS means a duty-cylcle of 15% which is really high! Probably you had a failure due to the excessive rms current in the primary circuit. You should avoid such high BPS...
Registered Member #1143
Joined: Sun Nov 25 2007, 04:55PM
Location: Vilnius, Lithuania
Posts: 721
Here is new bus bars layout Yellow is bottom layer ( directly on IGBT output ) Red is supply with at least 1.5cm spacer ( very very fat spacer, 324mm^2 ) On top we see 20uF 800V high current snubber, and will be smaller 2uF 1000V below . And at right side 800V 4700uF Rifa capacitor ( but two in series , and two in parallel , so it's 1500J) now just need somehow get M8 brass bolts
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Large DRSSTC [update]
