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Re: TC Output Voltage
Ed,
thank you for posting on this. I think there is one thing that
could be pointed out.....
> Re:
> "A friend of mine who is an RF engineer has examined some
> structures and come to the conclusion that a low Zo is required in
> the secondary. That is, a low L/C ratio in the helix itself. That runs
> completely counter to what we actually do in these machines (Lo
> Zprim, Hi Zsec) with Zsec dragged down by a lumped topload."
> I don't think it is necessarily counter at all. Consider
> the work with large toroidal upper terminals. For a given frequency
> these require lower inductance, hence decreasing the L/C ratio
> of the secondary and thus the surge impedance. With lower surge
> impedance LOADED Q and hence kQ is higher, making it easier to
> couple and pump a given amount of power into the shunt loss
> resistance represented by the discharge we are trying to achieve.
> I think a similar effect occurs with the "magnifier"
> configuration. "When I get time" (if ever) want to calculate
> some "T" equivalent circuits for our double-tuned (conventional)
> coils and play with some of the parameters. Think that might
> be a convenient and practical arrangement eliminating the primary
> as a device which has to be close to the secondary and hence
> subject to "strikes". I further think the difference between a
> magnifier and such a T is very small.
We are not tied to any particular frequency in designing a coil and
I see no reason to use a low inductance in the helix if that is so.
Certainly I agree the surge impedance can be arbitrarily lowered
by the topload and I think that is where it should be lowered. I would
think that under discharge conditions the ESR of the structure is what
counts? Your idea of examining equivalent networks is an interesting
one and could perhaps lead to some quite different physical
configurations. I like it! Definitely one to be explored IMO.
Regards,
Malcolm