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I have a stud type SCR which looks exactly like this. The bank is for a multistage optically triggered coil gun, so each coil (there are 30 is triggered by a break beam IR circuit.
basically how do I connect the SCR? What connects where? There two small leads I assume are connected to the output of the break beam circuit but then what part of the SCR connects to the coil and what part connects to a rail on the cap bank? I assume I need to close the circuit with a heavy duty cable from the other end of the coil back to the cap bank?
I have a stud type SCR which looks exactly like this. The bank is for a multistage optically triggered coil gun, so each coil (there are 30 is triggered by a break beam IR circuit.
basically how do I connect the SCR? What connects where? There two small leads I assume are connected to the output of the break beam circuit but then what part of the SCR connects to the coil and what part connects to a rail on the cap bank? I assume I need to close the circuit with a heavy duty cable from the other end of the coil back to the cap bank?
loos up the datasheet for your SCR, and it will tell you - and did I read that you have 30 coils, or is that just me? as for the break beams and coil triggering, you have to have a separate capacitor bank and SCR for each coil, calculated to make sure the previous coil turns off right before the next one turns on, unless you replace the SCr with an IGBT in which case you can have one capacitor bank, and adjust the coil timings much easier and more reliably, but IGBTs are more expensive than an SCR
if you haven't worked with coil guns or SCRs, and since you're asking how to hook up an SCR I'm assuming your new to it, start with a small single stage design and understand how SCRs and banks work. Remember, an SCR cannot be turned off once it is turned on unless the power is removed from it, so once it turns on your entire bank will want to go through it. This can be a problem with multistage designs, so make each SCR have a small individual bank instead
Registered Member #902
Joined: Sun Jul 15 2007, 08:17PM
Location: North Texas
Posts: 1040
Those connection schematics are right, but to add in a photointerrupter you need to do the following:
instead of using a switch and resistor for the SCR base for the second and third coils, attach it via a resistor to a small constant voltage, an have the photointerrupter connected to the base of a basic NPN transistor which has the collector in front of the resistor and the drain going strait To ground.
Thi is what happens. Hen the beam is unbroken by the projectile, the transisotr is on and preventig the current from flowing through the SCR assuming the value of the resistor is high enough and the SCR is not extremely sensitive. Jen the beam is broken, the transistor that is shorting the SCR base o ground turns off and let's the cureet flow to the SCR base and the SCR turns on. You might consider a delay circuit of some kind to make coil tigger timing easier, though you don't want too big of a bank because then the first coil will not run off before the second coil turns on
-Jimmy
p.s: excuse any typing errors, I'm mobile at the moment
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Connection for Breakbeam Triggered SCR with Capacitor Bank?
