| Electronics > Beginners |
| which type of capacitor for pulsed discharge |
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| Psi:
You could make a nice capacitor array with lots of Cornell Dubilier - 942C 2.5UF 600VDC high pulse rated caps in parallel. http://www.cde.com/resources/catalogs/942C.pdf But that would probably be a bit overkill for your requirements :) They're 628 volts per microsecond dV/dt :D and a pack of 200 caps to get 500uF 600V would allow ~40 million amp discharge current. |
| LaserTazerPhaser:
Id buy this https://www.ebay.com/itm/282977692008/ but its way too large for the application and will destroy the load from overheat or even melting. The issue with massive ganging is the cost at which point I would rather buy a dc link cap from a reputable retailer. I only need ~5 of these https://www.ebay.com/itm/6003058083 but its likely loaded with undocumented features - infact its documents are likely nowhere to be found also takes up quite a lot of area. |
| Marco:
--- Quote from: LaserTazerPhaser on April 03, 2019, 07:05:04 am ---Are there any electrolytics 360v-500v 540uf-1000uf which can fully charge & discharge @ ~0.714Hz? --- End quote --- Meaningless question, the power dissipated in the capacitor is load dependent ... i^2*r and all. Lets round off well over 200Amp to mean a 0.5 Ohm load ... that's in the same region as a cheap electrolytic in that range, so you'd be burning around 50 Watt, which would make it explode. |
| StillTrying:
Photo Flash capacitors ? |
| LaserTazerPhaser:
--- Quote from: Marco on April 03, 2019, 01:52:32 pm --- --- Quote from: LaserTazerPhaser on April 03, 2019, 07:05:04 am ---Are there any electrolytics 360v-500v 540uf-1000uf which can fully charge & discharge @ ~0.714Hz? --- End quote --- Meaningless question, the power dissipated in the capacitor is load dependent ... i^2*r and all. Lets round off well over 200Amp to mean a 0.5 Ohm load ... that's in the same region as a cheap electrolytic in that range, so you'd be burning around 50 Watt, which would make it explode. --- End quote --- A few simulations showed massive capacitor power dissipation at 100khz of ripple (1.8a peak) with only ~800mA of rms current. There are many capacitors which can handle much more than 800mA of ripple but 90W of dissipation per charge and @ 0.74hz seems too much. Maybe electrolytics are fine for this but even photoflash capacitors aren't made to flash any more than 0.5Hz and for a given duration beyond which they will degrade. |
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