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Registered Member #1430
Joined: Sun Apr 06 2008, 11:12AM
Location: Ã…rhus, Denmark
Posts: 102
hey everyone. i just found 6 capacitors(450V(500surge) 4700uf) in my drawer and thought i would use them for a coilgun. now, my question is: is it possible to put thyristors together in "banks" for triggering my coilgun? if yes, will 10 of These 12A 800V be able to handle just one of my capacitors?
also, i have never used thyristors or SCR's before, how i i wire them up?
BTW: by putting them together i mean all cathodes together, all anodes together and all gates togeter
Registered Member #690
Joined: Tue May 08 2007, 03:47AM
Location: New Jersey, USA
Posts: 616
I've heard a lot of knowledgeable people say paralleling SCRs doesn't work, because they have slightly different turn-on times and the first one to turn on will take all the current. However, I have paralleled 2 successfully and had them work fine. Not sure what 10 would do.
Also, these SCRs are pretty small. You can get 40A rated ones in the same package if you look. I really don't know if they will work for one of your caps, but all I can say is if it were me I wouldn't try it.
Registered Member #1062
Joined: Tue Oct 16 2007, 02:01AM
Location:
Posts: 1529
those will burn. Parralleling thyristors does work, but to a limit. If you have 2 10kA surge SCR's, and parrallel them, you cant use them at 20kA. They all share current, but one gets more then the other.
Registered Member #1774
Joined: Wed Oct 22 2008, 02:51AM
Location:
Posts: 135
Depends on your coil, ten of those can only handle around 1200amps peak so if you charge to 400v and have a 550uH coil then it will have a 1169Amp pulse for about 5mS. So technically yes. Nice Capacitors btw
Registered Member #1497
Joined: Thu May 22 2008, 05:24AM
Location: Toronto, Ontario, Canada
Posts: 801
Just as an aside note, putting SCR's into series also doesn't work (to increase the voltage) - because of different turn on times, eventually enough turn on that the voltage between anode and cathode exceed the breakdown voltage of the remaining SCR's, and the whole thing avalanches in one big waste of money.
Registered Member #1430
Joined: Sun Apr 06 2008, 11:12AM
Location: Ã…rhus, Denmark
Posts: 102
oh well, i guess i wont be using those thyristors then )
do you have any ideas on how to do the switching? i have a homemade relay i have been using for photoflash capacitors but mechanical switching wastes a lot of power right?
Registered Member #1262
Joined: Fri Jan 25 2008, 05:22AM
Location: Maryland, USA
Posts: 451
Mechanical switching isn't the most efficient in the world, but it is doable. If you spring load the contacts, you can get the switch closed during the current rise, before peak, and the losses wont be that bad. I'm using mechanical switching on my new 300V 12,000uF carbine style gun (of couse I've only fired it 180J so far... but with good results).
These SCRs are rated for 400A 10ms spike 600V. You can parallel a few and they should work.
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Thyrister bank good enough?
)
