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4hv.org :: Forums :: Sale and Trade
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Wanted; A Large SCR

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Inducktion
Mon Oct 31 2011, 11:35PM Print
Inducktion Registered Member #3637 Joined: Fri Jan 21 2011, 11:07PM
Location: Buffalo, NY
Posts: 1068
 		I need a large SCR... Stud, puck, module, anything. (tis for a coilgun)

PM me, or email me at **link**

We'll see how it goes from there. :)
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Matt Edwards
Wed Nov 02 2011, 11:51PM
Matt Edwards Registered Member #2838 Joined: Fri Apr 30 2010, 07:55PM
Location: tehachapi, CA
Posts: 333
 		Specs required?
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Inducktion
Thu Nov 03 2011, 12:12AM
Inducktion Registered Member #3637 Joined: Fri Jan 21 2011, 11:07PM
Location: Buffalo, NY
Posts: 1068
 		Needs to be able to handle +600 volts, around say, 2kA pulse.
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Matt Edwards
Thu Nov 03 2011, 03:52PM
Matt Edwards Registered Member #2838 Joined: Fri Apr 30 2010, 07:55PM
Location: tehachapi, CA
Posts: 333
 		Believe the best I have is maybe 100A 1600V
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klugesmith
Thu Nov 03 2011, 05:11PM
klugesmith Registered Member #2099 Joined: Wed Apr 29 2009, 12:22AM
Location: Los Altos, California
Posts: 1716
Oidium45 wrote ...
Believe the best I have is maybe 100A 1600V
That might do the trick for Inducktion,
even in a conservative design, if its datasheet can be found.

Look for a single-pulse current rating, and its measurement condition (pulse width and shape).
Within limits, the current can go higher if the time is reduced by the square of the current factor.
Some SCR data sheets give an I^2.T rating, in A^2.s, which applies to the time integral of I^2.
(occasionally, but I think wrongly, called the action integral).

Note that the force in an inductive disk launcher,
or a reluctance coilgun without magnetic saturation, is proportional to I^2.
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Inducktion
Fri Nov 04 2011, 01:01AM
Inducktion Registered Member #3637 Joined: Fri Jan 21 2011, 11:07PM
Location: Buffalo, NY
Posts: 1068
 		I do agree, that sounds like it would work!
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Matt Edwards
Fri Nov 04 2011, 04:28PM
Matt Edwards Registered Member #2838 Joined: Fri Apr 30 2010, 07:55PM
Location: tehachapi, CA
Posts: 333
 		I'll try to remember to look this weekend and send you some part numbers of what I have available. I'm not too familiar with QCW. Does it specifically need to be an SCR?
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Inducktion
Fri Nov 04 2011, 04:29PM
Inducktion Registered Member #3637 Joined: Fri Jan 21 2011, 11:07PM
Location: Buffalo, NY
Posts: 1068
Oidium45 wrote ...

I'll try to remember to look this weekend and send you some part numbers of what I have available. I'm not too familiar with QCW. Does it specifically need to be an SCR?

An SCR is the best and most affordable option as a semiconductor switch in a coilgun. A really beefy IGBT would work too, but it would be considerably more expensive.
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Matt Edwards
Fri Nov 04 2011, 05:34PM
Matt Edwards Registered Member #2838 Joined: Fri Apr 30 2010, 07:55PM
Location: tehachapi, CA
Posts: 333
 		Haha, I was varying between a few posts. Forgot this was for a coil gun. I don't suppose a triac would do the job?
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Inducktion
Fri Nov 04 2011, 07:04PM
Inducktion Registered Member #3637 Joined: Fri Jan 21 2011, 11:07PM
Location: Buffalo, NY
Posts: 1068
Oidium45 wrote ...

Haha, I was varying between a few posts. Forgot this was for a coil gun. I don't suppose a triac would do the job?


If the triac can handle the current values I stated above, then yes!

Edit;

So, I made my coil, and according to Barry's simulations, I should be getting a roughly 2kA pulse out of my coilgun, for a little under 8 mS.
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