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Re: [TCML] Re:Re:(TCML) Is a TC reversible?

Why would the receiving coil need a spark gap?

Old-fashioned Tesla coils use spark gaps simply because they were the best
"switching" device for the application (mainly, *driving* a resonator) back
in the day.

Modern Tesla coils and wireless energy transfer devices reply on
significantly more efficient inverters (DC to AC converters) built out of
transistors acting as switches to excite the primary. A rectifier performs
the opposite operation (AC to DC conversion), and is what you would want to
use in order to extract energy out of a receiving assembly. Needless to
say, it would both be difficult and inefficient to get some sort of "biased
spark gap" rectifier to switch and then quench at RF (we have a hard enough
time quenching at 120Hz!), and pretty easy to find some fast diodes that
could do the job.

Hope that helps!

On Sun, May 26, 2013 at 10:06 AM, <vatercox@xxxxxxx> wrote:

>  Dear List,
> A propos of previous questions:-
> If a couple of TCs  of same resonant frequency (A and B) with the  TC
>  (A)'s primary gap "biased" (with HV ac or dc) to breakdown (i.e. sparking)
> and TC (B)'s primary gap biased (as before)  to just under breakdown (i.e.
> non-sparking) were moved into proximity with one another, could A act as a
> transmitter and B as a receiver, with energy from coming from the primary
> circuit of A reappearing on the low frequency ac or dc side of B via Bs'
> primary gap -which is biased to above breakdown (sparking) upon reception
> of impulses from A?
> I say this because as I see it, when the RF voltage swings negative and
> positive, the sum of the voltages across the gap could theoretically go
> above and below the breakdown threshold of the gap, triggering sparking
> -and energy transfer- on say, positive half cycles but not negative, or
> vice versa. Is this a  realistic possibility?
>  Or is a spark gap too unpredictable for this application -and If that is
> so, are there any other kinds of "simple" two-terminal device that could
> replace it  to better effect?
> Jolyon Vater Cox
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