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Re: Colorado Springs scheme
--- Tesla List <tesla-at-pupman-dot-com> wrote:
> Original Poster: "Antonio Carlos M. de Queiroz"
> <acmq-at-compuland-dot-com.br>
>
> Boris Petkovic wrote:
>
> > Has anybody tryed experimenting Tesla's scheme 4
> for primary circuit -
> > "Colorado Springs notes",date 2.july
> > 1899. -scheme 4?
> > I'm curious about it since lows of transients of
> lumped circuits
> > doesn't support formulae and great parts of text
> at all, but Tesla's
> > words of "little current through the spark gap and
> big through LpCp
> > circuit" are very important (smaller losess in
> prim.circuit,more
> > succesfull quenching).If that assumption (while
> rotary employed)is just
> > partialy correct in praxis -I think it is worth of
> checking out.
>
> That circuit is a case of "triple resonance",
> similar to a magnifier.
> Note that the circuit can be drawn in this way, with
> the gap closed:
>
> k12
> +---L1---+---+ +---+
> | | | | |
> C1 Cp Lp Ls Cs
> | | | | |
> +--------+---+ +---+
>
> This is a magnifier model drawn backwards. The
> energy oscillates
> periodically between C1 and Cs, starting from C1
> instead of from
> Cs in the magnifier, using the "descending" parts of
> the beats
> instead of the "ascending" parts. The formulas for
> the
> triple resonance optimum design apply directly (and
> Tesla's equation
> II is not correct for optimum design).
>
> Example, if you want to simulate:
> Mode 345, base frequency: 100 kHz
> Energy transfer in 5 us, in 4 semicycles of 400 kHz
> Voltage gain: sqrt(C1/Cs)=31.6
> Cs=10 pF
> C1=10 nF
> Cp 81.27 nF (!)
> Ls 18.05 mH
> Lp 2.216 uH
> L1 15.83 uH
> K12 0.3504
>
> With most of the primary capacitance in Cp, the
> current through
> the gap is really small compared to the current
> through Lp.
> The main price is more capacitance at the primary
> circuit.
>
> See the formulas at:
> http://www.coe.ufrj.br/~acmq/magnifier.html
>
> Antonio Carlos M. de Queiroz
>
Thanks Antonio!
You hit the right wire.I'm familiar with magn. waveforms and when saw
yours"This is magn.modell drawn backwards" I knew where erorr had
been.Equation 2 - incorrect..That distracted me from right looking upon
the scheme.Your answer is excellent one.Thanks once again.
Regards,
Boris
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