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Registered Member #135
Joined: Sat Feb 11 2006, 12:06AM
Location: Anywhere is fine
Posts: 1735
DC requires you use a large high voltage rated choke, like 2 - 10 H rated to handle 30-50KVDC. This is to limit the surge current of the DC supply trying to charge up the high voltage capacitor.
Most of us do not have a choke like this lying around(they're huge), and rectification is an extra step, so AC is easier to deal with.
Plus, you are firing your AC system once the capacitors have reached a peak voltage, there are two peaks per cycle, so essentially you are firing once the caps are fully charged just like a DC system, so what would be the point of over-complicating what you are already doing?
Registered Member #1403
Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968
The DC resonant charging coil might be a more complex (and heavier) construction, but the sound of a high break rate coil like that is scary in a whole other way than a regular SGTC :)
Registered Member #1521
Joined: Thu Jun 05 2008, 10:46AM
Location: Hungary
Posts: 128
Depends on the power input. I planned a 3 phase spark gap TC, and it could be used only as a DC coil with a charging choke. The charging choke is pretty complex since the extremely high peak voltage and the high saturation effect of the DC and the high inductance. For 1 phase, I prefer AC, and likely with synchronous spark gap.
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Tesla coil... AC or DC input?
