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Re: Reflections in Power Transfer
Subject: Re: Reflections in Power Transfer
Date: Wed, 14 May 1997 08:24:59 +1200
From: "Malcolm Watts" <MALCOLM-at-directorate.wnp.ac.nz>
Organization: Wellington Polytechnic, NZ
To: tesla-at-pupman-dot-com
Hi Greg,
> From: Greg Leyh <lod-at-pacbell-dot-net>
> To: Tesla List <tesla-at-pupman-dot-com>
> References:
> 1
>
>
> Malcolm Watts wrote:
>
> > I was pondering the fact that we never see the secondary
> > ringdown in just a cycle or less when loaded by spark. That means
> > that no matter what the V/I ratio in the spark, it never equals Zo of
> > the secondary.
> > Turns out the answer is blindingly obvious: We know that a spark
> > is a non-linear resistance. Matching to Zo requires an ordinary
> > resistance. Therefore, a proper match never occurs, regardless of the
> > V/I content of the spark (which changes wrt time anyway).
>
>
> True, it does change wrt time, but wouldn't the streamer start out at
> a high Z, with Z decreasing as power is pumped into it, until the point
> of maximum power xfer is reached? Beyond that point, the spark power
> would start decreasing, until its Z rose back towards the point of
> max pwr xfer.
>
> -GL
I agree with what you say regarding streamer Z. But considering that
the current is changing continuously, so is the terminating impedance
and it must be changing sinusoidally I think. Is there some way then
we can minimize loaded VSWR and get the energy out in one cycle?
I guess the point of my bit was to understand why the thing still
rings and I'm sure the mismatch is the element at work.
Any other thoughts welcomed,
Malcolm