Re: [TCML] magnifier to classic coil progression

["Antonio Carlos M. de Queiroz" <acmdq@xxxxxxxxxx>]

futuret@xxxxxxx wrote:
> Regarding coupling in the system, the following should
> be noted.? Often it is said that a magnifier uses tight
> coupling.? This is not entirely accurate because although
> the primary to secondary coupling is tight in a magnifier,
> the overall coupling of the system is similar to that of
> a classic coil.? The presence of the extra coil actually
> reduces the overall coupling of the system.? This effect
> has been mathematically described by Antonio DeQueroz
> on this list.? There is probably more information about this
> at his website:
>
> http://www.coe.ufrj.br/~acmq/tesla/magnifier.html
>
> Antonio also discusses other aspects of magnifier
> behavior at his website including ways in which the
> energy can be fully trapped in the extra coil.? For this
> to be realized, a faster quenching gap is needed.? It's
> likely that mechanical rotary gaps are not up to the task.
> The newer solid state DRSSTC type coils may be
> better able to benefit from magnifier topology because
> of their electronic quenching.? It remains to be seen
> if the instabilities of spark loading and spark growth
> will interfere with the attainment of?theoretical benefits.
>
> This is just an overview.? There are other magnifier
> issues which I didn't adress above.? 
There is a continuous range of possible divisions between
the secondary and tertiary coils only if you don't care about
the energy trapped in the secondary capacitance.
If the system is designed to transfer this energy to the
output, there is only a set of discrete solutions, as pointed
out in my site. For systems that transfer the energy
in several cycles, the trapped energy is not really important.
For systems designed for fast energy conversion, using just one
or two cycles, the trapped energy is significant.
Actually, this kind of magnifier design (that I just
reformulated and extended, not invented), was studied just
with this purpose.
Try the program mrn6 to see the possibilities, available at:
http://www.coe.ufrj.br/~acmq/programs

Magnifiers intended to produce sparks are more practical if
the mode is chosen as n, n+1, n+x, where x>>2, even. This
reduces the size of the required secondary capacitance, until
it can be just a distributed capacitance at the connection
between secondary and tertiary coils. The effect of this is
to cause a high-frequency oscillation to appear at the top
of the secondary coil. Would this have some influence on the
behavior of the coil? I don't know.

A "triple resonance solid-state Tesla coil", TRSSTC, where a
magnifier structure is driven by a switching driver, looks
quite problematic, if a design with no trapped energy in the
secondary coil is tried.
There is no solution with perfect energy transfer that keeps
the voltage and current in the driver in phase, as easily happens
in a DRSSTC, and even with the designs that realize the transfer,
many cycles are required for it.

Antonio Carlos M. de Queiroz


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