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Registered Member #989
Joined: Sat Sept 08 2007, 02:15AM
Location: São Paulo, Brazil
Posts: 476
After a few runs of my DRSSTC, I was thinking about
What defines the Output voltage?
With SSTC work, I noticed that only coupling/#turns changes the voltage, but not the secondary turns or height (With same driver system and bridge I tryed two secondaries, one with 30cm and other with 60cm, with both 4'' winded with 30AWG wire, no noticeable difference on output)
But on a DRSSTC? With same bridge and driver, if I low the fres (By putting my 60cm secondary instead the 30cm one) and adapt the Primary LC, I will gain voltage on output?
Registered Member #56
Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445
They behaive exactly as do SSTCs, but your assumption that output voltage of a sstc is independent of turns/height it wrong. Even if they behaved the same electrically the different in resonant frequiency and this impedance of the spark would change the output voltage.
I know that Terry Fritz was working on modeling a lot of this with his SISG project, might want to look into that (there were posts on this forum with a ton of info)
Registered Member #540
Joined: Mon Feb 19 2007, 07:49PM
Location: MIT
Posts: 969
The farther the winding are away from the pri coil, the less coupling. The upper windings would get very little coupling so they would act just like a resistive, capacitive, inductive load on the output. Is this right?
Registered Member #1739
Joined: Fri Oct 03 2008, 10:05AM
Location: Moscow, Russia
Posts: 261
No. The idea is - the bottom part of the coil, where the coupling is high, acts as a transformer and takes not much part in resonant effects, while the top part acts as a resonator. Any coil can be taken as a base-fed one, where, if the coupling is, say, 0.35, the lower 35% of the secondary is a pure transformer and higher 65% is a resonator. So in a non-DR SSTC you need a higher coupling as you want a high enough voltage feeding the resonator as the primary voltage is nearly equal to the mains one. In DRSSTC the primary current is rising as well as primary voltage does, so such a high coupling would only lead to an arcover.
Registered Member #160
Joined: Mon Feb 13 2006, 02:07AM
Location: Melbourne, Australia
Posts: 938
Mestre Racerxdl wrote ...
I tryed two secondaries, one with 30cm and other with 60cm, with both 4'' winded with 30AWG wire
Do you mean 30mm and 60mm? I'd say that the difference is the magnetic field that is created. In a SSTC, the amps is limited to the amount the mains can supply, whereas in a DRSSTC the capacitor is able to store and dump a greater amount of current into the primary, therefore creating a larger magnetic field.
Registered Member #989
Joined: Sat Sept 08 2007, 02:15AM
Location: São Paulo, Brazil
Posts: 476
No, I mean 30cm and 60cm, its secondary height. One have about 1000 turns and other about 2000 turns. On my coils working here, I have 3,5cm of the secondary coil with the primary coil (1,5cm distance between then), total 7 turns.
When I changed the secondary, it doesnt make any difference, only if I lower the primary turns (on SSTC) it makes a LOT difference (higher current drawn from mains, and higher voltage output). On DRSSTC I dont know, I didnt tryed. But with the 30cm secondary, and 7 turns primary at perfect ressonance (50nF cap) (measured) I get some what 45-60cm sparks with 4A drawn from mains. Will I get better sparks with the 60cm secondary? (The Ressoant cap will be 150nF instead 50nF)
Registered Member #160
Joined: Mon Feb 13 2006, 02:07AM
Location: Melbourne, Australia
Posts: 938
Sorry, I thought you meant both 4" tall. I still think it has a lot to do with the current supplied, therefore a larger cap (given it can be charged from a suitable source) will provide more current to the primary coil and therefore a stronger magnetic field, transferring the energy more efficiently.
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DRSSTC -> Output voltage
