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Forums
4hv.org :: Forums :: Electromagnetic Projectile Accelerators
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1 stage CG, thyristor, I need repeated fire? (circuit help)

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Steve Conner
Tue Oct 08 2013, 01:28PM
Steve Conner Registered Member #30 Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
Zzzwhat... Quit squabbling, young whipper-snappers.

If you want to do energy recovery, the best circuit I know of is the diagonal half-bridge with two IGBTs and two diodes.

You can use as big a capacitor as you like because you can end the pulse before it discharges completely, by turning the IGBTs off. This means you could use a huge capacitor and store enough energy for several shots. It can be polarised because the voltage never reverses.

The unused magnetic energy in the coil gets returned to the capacitor via the diodes, so you can use it for the next shot.
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PlayNice
Wed Oct 09 2013, 07:41AM
PlayNice Registered Member #8032 Joined: Tue Nov 13 2012, 01:22AM
Location: Chicagoland USA
Posts: 33
Ok that really sounds good as I already have all the parts to build it. Steve are you talking about something like this then?:

Coilgunsw
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Steve Conner
Wed Oct 09 2013, 09:18AM
Steve Conner Registered Member #30 Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
Yep. The only difficulty is that you need floating gate drive for M1.
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