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Registered Member #540
Joined: Mon Feb 19 2007, 07:49PM
Location: MIT
Posts: 969
With an inverter or line voltage doubled with a light bulb in series to limit the current. With both setups you would probably want to have a volt meter on the cap so that you can see how much voltage there is and when to disconnect it so that you don't over charge anything.
Look at the next thread down called "Boost Converter 4.5VDC-330VDC"
actually i want that charged cap for my coil gun, if so, please tell me that can i charge the same cap with 4.5VDC-330VDC while i have 400VDC cap?does it make the difference or not?if yes give the scematic please
Registered Member #540
Joined: Mon Feb 19 2007, 07:49PM
Location: MIT
Posts: 969
400V is the max voltage you can apply to the cap (it can be overrated but I don't suggest it) so 300V or 330V is fine. Make sure you have a diode that is in reverse parallel with the cap so that you don't kill it due to reverse voltage from the coil. With 400V compared to 330V with the same cap, you get more energy out of a single cap.
Registered Member #1262
Joined: Fri Jan 25 2008, 05:22AM
Location: Maryland, USA
Posts: 451
Charging the cap to 330V will give it 370J of energy, while charging it to 400V will give it 544J. You will lose some power at the lower voltage, seeing as the energy is equal to half the voltage squared times capacitance. I'd still say to go for 330V, however you do lose power. If 330V isnt enough kick you can always make a higher voltage charger to obtain more energy.
Registered Member #90
Joined: Thu Feb 09 2006, 02:44PM
Location: Seattle, Washington
Posts: 301
One simple way to charge a coilgun is a transformer connected to the ac mains followed by a diode rectifier. It has the advantage of being an extremely fast charging method.
Barry I used to have a handle on life, but it broke off
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how to charge the 6800MFD/ 400VDC Cap?
