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Re: Pri to Sec capacitive coupling
Open questions to anyone:
I understand inductive coupling as magnetically induce emf, but I am not
familiar
with capacitive coupling. Is this just the effect of charge difference (and
therefore voltage) between primary and secondary? How significant is this
if both
circutis are grounded? Is it correct to suppose that it is a DC voltage
during gap
firing or will it vary with the resonant frequency? What is the magnitude
relative
to the actual potential across the primary? . . . relative to the induced
voltage
in the secondary?
Bryan Kuafman
Tesla List wrote:
> Original Poster: Terry Fritz <twf-at-verinet-dot-com>
>
> Hi All,
>
> I measure the capacitance from my primary coil to my secondary
coil at
> 55pF. That seems high to me but I don't think I am doing anything wrong.
> Of course, all external connections are removed for the measurement.
>
> This brings up the effects that mutual CAPACITIVE coupling may
have in
> Tesla coil operation. We all always talk of inductive coupling but never
> of capacitive coupling.
>
> In my system (center grounded tap neon), the primary coil is
floating in
> such a way that as the starting turns on the primary are going negative,
> the outer turns or going positive. Perhaps this cancels the effects that
> such capacitive coupling would have. However, if one were to ground one
> end of the primary I would thing this would start to significantly affect
> coupling?
>
> Just a thought...
>
> Terry