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Re: Hybrid Coil (was Coil Efficiency)
From: Greg Leyh[SMTP:lod-at-pacbell-dot-net]
Sent: Friday, August 01, 1997 4:04 PM
To: Tesla List
Subject: Re: Hybrid Coil (was Coil Efficiency)
Tesla List wrote:
> > If in PSPICE an appropriate capacitor (7.5 nF for my coil) is connected
> > across the lower 1/12 of the secondary on a standard coil, then the
> > operation of the coil is almost identical to that of a magnifier, according
> > to PSPICE. This is because the K values between the primary and the lower
> > 1/12 of a secondary of a typical coil are around 0.4, whereas coupling to
> > the upper 1/12 may be less than 0.01. The point where the 7.5nF cap is
> > connected defines exactly where the 'tap' is along the secondary.
> >
> > I propose calling this arrangement a 'hybrid coil', as it is not a pure 2 coil
> > system (due to the secondary tap) nor a 3 coil magnifier (finite coupling exists
> > between the primary and 'free resonator').
> >
> > -GL
>
> How did you determine the value of the capacitor? (guess - Xc gives a
> resonant condition at natural Fr for the 1/12 portion of the line?).
> I've got to try this.
>
> Malcolm
Good guess! Yes, that was my starting point, then I played a lazy game
of hi/lo in PSPICE, until the output voltage was optimized. Since the
pentium takes only a few seconds to do the simulation, this was far faster
(and probably more accurate) than me thinking about all of the various
coupling effects on the cap value.
-GL