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Registered Member #229
Joined: Tue Feb 21 2006, 07:33PM
Location: Romania
Posts: 506
How many RF cycles are needed to fully develop the spark output from a tesla coil? This applyes to all kinds of tesla coil (SGTC, SSTC, VTTC) or are there some differencies? I am interested especially for a VTTC. I remember that this was discussed somewhere in the forum, but can not locate the thread. Because a GMI90 stays ON under 3 microsec, I have to figure what would be the resonant frequency of the secondary.
Registered Member #2040
Joined: Fri Mar 20 2009, 10:13PM
Location: Fairfax VA
Posts: 180
I think it would in part depend on how many cycles it takes for the primary current to build up. For my DRSSTC I don't see any improvement when increasing RF cycles past 8. I remember reading about someone else that had the same results, but I can't remember who.
By contrast Mr McConner's first DRSSTC took many cycles to build up it's primary current. Check the scope traces here:
The maximum possible current that could pass through a series resonant circuit for a given voltage depends on the ESR. The rate at which the current builds is proportional to the maximum possible current. So if we have two circuits with different ESRs, and our target current is less than the maximum current for each, then the circuit with the lower ESR will reach our target current first.
Also keep in mind that the current in the primary tends to build in a logarithmic or SQRT(X) shaped curve, so there is diminishing returns for every additional RF cycle. I would think the actual equation is something like the charging of a capacitor, maybe:
InstantaneousCurrent = MaxCurrent * (1 - (1 / e^ct)) where c is some constant and t is time
There is also some other stuff going on with the actual arcs but I won't claim to know much about that, something to do with RF propogation I think.
Registered Member #2566
Joined: Wed Dec 23 2009, 05:52PM
Location:
Posts: 147
vasil wrote ...
How many RF cycles are needed to fully develop the spark output from a tesla coil? This applyes to all kinds of tesla coil (SGTC, SSTC, VTTC) or are there some differencies? I am interested especially for a VTTC. I remember that this was discussed somewhere in the forum, but can not locate the thread. Because a GMI90 stays ON under 3 microsec, I have to figure what would be the resonant frequency of the secondary.
For SGTCs I dunno. But for VTTC HUNDREDS of RF cycles are needed to fully develop spark lenght. How many cycles,depends on the operating frequency and max output voltage. And for max spark lenght dependence on frequency and voltage for CW coils and VTTCs see graph here:
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RF cycles vs spark
