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Registered Member #1107
Joined: Thu Nov 08 2007, 10:09PM
Location:
Posts: 792
i recalculated using a lcr simulator and decided to go with 920uf at 1.6kv will give me 1.5kj of energy. also Has anyone successfully done a can crusher with lytics? I was thinking the pulse is just not fast enough but not sure. I tried it with my 3kJ lytic bank, ~6800uF, I think maybe up to 1-1.5kJ, and got nothing. Alternatively, my 120uF energy discharge cap charged at 1KJ put a serious hurtin on a can. IDK, maybe I just had a poor coil, I didnt play with the lytic can crushing much. with a high uf low voltage the caps discharge much slower like 1.5s and with a lower uf higher voltage i can get the caps to discharge at around 65ms and that is what you need to crush a can or blow up a apple or whatever you plan to do with it.
Registered Member #1083
Joined: Mon Oct 29 2007, 06:16PM
Location: Upland, California
Posts: 256
I've discovered that low voltage and high capacitance is poor for can crushing. High voltage and low capacitance has higher rise time because there is not as much charge to discharge (coulombs), but equal energy (joules). You would get good results with 'lytics if you placed them all in series and got a relatively low capacitance but high voltage.
Registered Member #690
Joined: Tue May 08 2007, 03:47AM
Location: New Jersey, USA
Posts: 616
Its ALL about the discharge time. A very good inverter grade lytic can discharge in around a millisecond. By contrast, your average HV pulse capacitor can discharge in 30uS. The difference there is huge.
Plus, if you do try to discharge lytics faster than they can handle, they may not take the abuse very well (use your imagination). Even the big pulse caps can self-destruct if you discharge them too fast or ring them too much.
Registered Member #1208
Joined: Thu Jan 03 2008, 05:30PM
Location: Chesterland, OH
Posts: 154
andyman, that isn't practical, because ESR adds up quick... ~30mO each needs only 3 caps to reach a whopping tenth of an ohm... parallel caps cut down on that, but low voltage isn't practical, so most people combine the 2. Ex, I just got 12 caps for an induction launcher. i made 4 banks of 3 caps in parallel, and put the 4 banks in series. this gives me ESR and ESL of 125% the ESR and ESL of a single cap... at 4x the voltage, and 75% the capacitance...
for the 3rd time i stress NOT using silicon switching... It's just too slow...
Registered Member #1107
Joined: Thu Nov 08 2007, 10:09PM
Location:
Posts: 792
today i went to the local electronics store and they had a 4uf 5kv discharge cap for $15 so i grabbed it and with an lcr meter i can generate a charge up to 25ka so i am going 2 play with that probably tomorrow and see what i can do with it.
Registered Member #1208
Joined: Thu Jan 03 2008, 05:30PM
Location: Chesterland, OH
Posts: 154
even then, it's only ~50 joules. assume 5% efficiency, that gives you 2.5 joules mechanical. i hate to say it, but no effect is likely... and what local electronics store was that?
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power calculations
