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4hv.org :: Forums :: Electromagnetic Projectile Accelerators
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Should I re-buss my cap bank?

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FastMHz
Sat Mar 10 2012, 04:28PM Print
FastMHz Registered Member #179 Joined: Thu Feb 16 2006, 02:08AM
Location: Hagerstown, Maryland - Close to Prime Outlets
Posts: 287
Hello all my high voltage peeps!! With Spring coming, I'd like to *finally* resume experiments with my discharge system.

Right now, my bank is wired as a bunch of parallel strings in series, like this:
24kj Bussed

Should I instead re-buss them so that they are a bunch of series strings in parallel?

I'm wondering based on what I've seen in battery packs. Some are wired one way and some the other, though most I've seen are series of paralleled cells. I'm trying to determine what would result in less cap reversing during discharge.

Cheers!!
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Saz43
Sun Mar 11 2012, 12:57AM
Saz43 Registered Member #1525 Joined: Mon Jun 09 2008, 12:16AM
Location: America
Posts: 294
Wow what a capacitor bank!!! And good to see you posting again! The coilgun you made years ago was a huge inspiration for my last project.

My opinion on the capacitor bank: I say leave it how it is, I'd rather see more time and effort put into using it to blow stuff up, rather than re-bussing it.
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m4ge123
Sun Mar 11 2012, 01:13AM
m4ge123 Registered Member #4118 Joined: Mon Oct 03 2011, 04:50PM
Location: MD
Posts: 140
I would say leave it as it is. If you put series strings in parallel it would be more likely for some caps to get overvolted due to different capacitances. The way you have it now, each mini-bank has a much closer tolerance to the nominal value because any differences mostly cancel out. This keeps the voltages on each mini-bank close to each other.
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Killa-X
Sun Mar 11 2012, 02:19AM
Killa-X Registered Member #1643 Joined: Mon Aug 18 2008, 06:10PM
Location:
Posts: 1039
Reminds me of mine, but mines only 48 caps...I did series parallel, so i could charge to about 3KV for a little extra kick. I think what you have is plenty fine, and it seems to work great for you, and blew up a lot of things :)
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FastMHz
Sun Mar 11 2012, 03:18PM
FastMHz Registered Member #179 Joined: Thu Feb 16 2006, 02:08AM
Location: Hagerstown, Maryland - Close to Prime Outlets
Posts: 287
I shall not re-wire my cap bank then smile

I will be working on a charger upgrade, however.
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teravolt
Thu Mar 15 2012, 01:46PM
teravolt Registered Member #195 Joined: Fri Feb 17 2006, 08:27PM
Location: Berkeley, ca.
Posts: 1111
just remember that if one cap shorts all that energy will dump into it likely exploding. be carefull
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FastMHz
Thu Mar 15 2012, 05:02PM
FastMHz Registered Member #179 Joined: Thu Feb 16 2006, 02:08AM
Location: Hagerstown, Maryland - Close to Prime Outlets
Posts: 287
Already happened! It launched itself with such force that it blew through the 1/8" lexan sheet I keep over the bank.
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Gomez
Wed May 08 2013, 10:56PM
Gomez Registered Member #2328 Joined: Tue Sept 01 2009, 03:44AM
Location: Denver, Colorado, USA, Sol-3
Posts: 7
What is your buss material?!? I-squared-R is gonna eat your lunch unless you're including big PFL inductors.
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