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4hv.org :: Forums :: Electromagnetic Projectile Accelerators
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help need to calculate the out put current of a capacitor

Author Post
rajheman
Wed Sep 14 2016, 11:52PM Print View
Registered Member #54872
Joined: Fri Apr 17 2015, 06:33AM
Location:
Posts: 24
please tell me how to calculate the out put current of a capacitor as mentioned in this picture af power labs railguns power supply



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hen918
Thu Sep 15 2016, 09:06AM
Registered Member #11591
Joined: Wed Mar 20 2013, 08:20PM
Location: Alfreton, UK
Posts: 407
The easiest way is to use Barry's coilgun simulator:
It does require you to use an older browser and enable unsigned java to run in your system settings
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Blackcurrant
Thu Sep 15 2016, 03:08PM
Registered Member #2989
Joined: Sun Jul 11 2010, 12:01AM
Location: UK
Posts: 73
Cap Bank= 3088uF ESR14.7mOhhm ESL1uH @3200V
so for max power out the load must be about 14.7mOhm = about 100kA
I would use a spice program to see the current discharge curve. ie SIMetrix
there's 4 strings of 8 caps so 100/4=25kA
I would think this would be very cruel to the caps though

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klugesmith
Thu Sep 15 2016, 10:55PM
Registered Member #2099
Joined: Wed Apr 29 2009, 12:22AM
Location: Los Altos, California
Posts: 1491
Took a while to get Barry's coilgun simulator working here, for the first time in a few years. Sam's numbers don't add up, which is not surprising. (He's a gifted young man, but was a lot younger in 2003).

An ESL value of 1 uH would be very significant. Here's a simulated discharge limited only by cap-bank ESR and ESL -- it takes much longer than 62 us.

The peak power to the load in that case is exactly zero, because there's no voltage drop in the ideal discharge switch.

Following Blackcurrant's suggestion, I added another 14.7 mΩ in series to represent a "real impedance" matched load.


Now half of the stored energy goes to the load, and half is dissipated inside the cap bank. For the load to get a bigger share of the energy, it needs to have a higher resistance and the transfer needs to take more time.
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rajheman
Tue Sep 20 2016, 04:09PM
Registered Member #54872
Joined: Fri Apr 17 2015, 06:33AM
Location:
Posts: 24
Thanks every one for giving me your valuable suggestions.
dear sir hen918 i was unable to run Barry's coilgun simulator in my laptop which has internet explorer 8 with java version 8 updated 101.
can u plz suggest me how to run the simulator
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Barry
Mon Nov 21 2016, 04:59AM
Registered Member #90
Joined: Thu Feb 09 2006, 02:44PM
Location: Seattle, Washington
Posts: 298
Did you ever get the RLC simulation page working?
It can still run in Windows 10 but the the environment gets more difficult to set up every year.
~ Barry ~
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