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Forums
4hv.org :: Forums :: Electromagnetic Projectile Accelerators
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cap charging safty advice

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ben5017
Fri Sept 23 2011, 05:21PM Print
ben5017 Registered Member #3315 Joined: Thu Oct 14 2010, 04:23PM
Location:
Posts: 156
I jus ordered the second cap charger at Link2 . i am going to use it to charge x10 1000mfd 450v for 1 kj cap bank. my question is simple what are some recomended safty features to protect me and the electronics from death.
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Adam Munich
Sat Sept 24 2011, 04:00AM
Adam Munich Registered Member #2893 Joined: Tue Jun 01 2010, 09:25PM
Location: Cali-forn. i. a.
Posts: 2242
Basically;

Don't ground the cap bank.
Don't touch both the red and the black wires at the same time.
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haxor5354
Sun Sept 25 2011, 01:13AM
haxor5354 Registered Member #2063 Joined: Sat Apr 04 2009, 03:16PM
Location: Toronto
Posts: 352
just make sure its next to impossible to touch the cap terminals by accident. (i.e putting your caps in a plastic container with lid and drill holes for wiring)
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vk2fro
Sun Sept 25 2011, 11:00PM
vk2fro Registered Member #3930 Joined: Sun Jun 05 2011, 07:27PM
Location: Sydney, Australia
Posts: 33
and put a suitable bleed resistor across them, that will suck the cap down to 0v after a short period (a minute or 2) as a saftey measure.
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ben5017
Mon Sept 26 2011, 06:07PM
ben5017 Registered Member #3315 Joined: Thu Oct 14 2010, 04:23PM
Location:
Posts: 156
ok good call on the bleed resistor. would you have any idea how to size them?. How about features for protecting the electronics system from self destruction. fuses, diodes ect??
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Adam Munich
Mon Sept 26 2011, 06:22PM
Adam Munich Registered Member #2893 Joined: Tue Jun 01 2010, 09:25PM
Location: Cali-forn. i. a.
Posts: 2242
Well how big is your capacitor?

RC == Time constant, after 5 time constants the capacitor is discharged.

1kOhm, 10,000uF == 1,000 * 0.01 == 10s * 5 = 50 seconds to discharge.
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