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4hv.org :: Forums :: Tesla Coils
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Tesla coil... AC or DC input?

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Slava
Sun Nov 08 2015, 09:59PM
Slava Registered Member #518 Joined: Tue Feb 13 2007, 05:20AM
Location: New York
Posts: 168
A lot of schematics that I looked at are based on AC HV output from a transformer. Can you use a HV DC input? Will it be the same? Better? Worse?
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nzoomed
Sun Nov 08 2015, 11:52PM
nzoomed Registered Member #54503 Joined: Sun Feb 22 2015, 10:35PM
Location: New Zealand
Posts: 288
Slava wrote ...

A lot of schematics that I looked at are based on AC HV output from a transformer. Can you use a HV DC input? Will it be the same? Better? Worse?
AC is better, but i expect you need to rectify AC anyway if you plan to use a high voltage DC supply.

Some people do it, but expect losses and you will need more capacitors.
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Hazmatt_(The Underdog)
Mon Nov 09 2015, 04:00AM
Hazmatt_(The Underdog) 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?


MK
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nzoomed
Mon Nov 09 2015, 06:10AM
nzoomed Registered Member #54503 Joined: Sun Feb 22 2015, 10:35PM
Location: New Zealand
Posts: 288
Yes i agree with Hazmatt.

With my first post i had a DRSSTC on the brain, so ignore that. For a SGTC, go AC all the way!
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Mads Barnkob
Mon Nov 09 2015, 08:02AM
Mads Barnkob 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 :)

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omegalabs
Mon Nov 09 2015, 09:09PM
omegalabs 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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