Author Topic: What capacitor configuration to explode foil?  (Read 194 times)

Offline FPS

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What capacitor configuration to explode foil?
« on: May 07, 2024, 03:51:32 PM »
If one had a choice of one 10000uF capacitor or ten 1000uF capacitors connected with 3mm copper bus bar (rectified 220v AC -> 300v 450J) to explode an aluminium foil strip which one would be the best? How significant a difference would this make?

One 10000uF capacitor is obviously way more convenient and I'm feeling the urge to test both, but that is expensive.


Offline Mads Barnkob

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Re: What capacitor configuration to explode foil?
« Reply #1 on: May 17, 2024, 07:14:35 PM »
More capacitors in parallel will give you a lower overall ESR, so higher short circuit currents.

More capacitors in series will give you a higher voltage, which is more efficient in breaking down insulations and wear on spark gaps gets lower with higher voltage.

A 10000 uF capacitor is most likely physically longer and not made for pulse discharge, but for staple voltage smoothing. So from its application is much worse than 10 smaller caps.
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Offline klugesmith

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Re: What capacitor configuration to explode foil?
« Reply #2 on: May 17, 2024, 11:49:33 PM »
The more you reduce external R and L, to maximize the pulse current,
the more you are abusing the capacitors (whether 1000 or 10000 uF).
I bet there is no electrolytic capacitor whose datasheet says it can tolerate the short-circuit current of a crowbar across the terminals.

Offline MRMILSTAR

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Re: What capacitor configuration to explode foil?
« Reply #3 on: May 18, 2024, 05:44:41 AM »
A crowbar is even hard on energy discharge capacitors. During my initial incarnation of the 6-Maxwell capacitor bank for my large SGTC, I experienced 2 or 3 flash-overs between capacitors. The 3rd one cracked the case of one of my Maxwells allowing the oil to leak out even though it was rated for a maximum of 25,000 amps. I then re-designed the layout and the capacitor bank has been operating trouble-free for the last 5 years.
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Re: What capacitor configuration to explode foil?
« Reply #3 on: May 18, 2024, 05:44:41 AM »

 


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