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Re: Top-load altering Q-factor of secondary cct
- To: tesla@xxxxxxxxxx
- Subject: Re: Top-load altering Q-factor of secondary cct
- From: "Tesla list" <tesla@xxxxxxxxxx>
- Date: Mon, 24 Oct 2005 17:08:56 -0600
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- Delivered-to: tesla@pupman.com
- Old-return-path: <vardin@twfpowerelectronics.com>
- Resent-date: Mon, 24 Oct 2005 17:10:08 -0600 (MDT)
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Original poster: "Malcolm Watts" <m.j.watts@xxxxxxxxxxxx>
On 23 Oct 2005, at 18:49, Tesla list wrote:
> Original poster: Gav D <gdingley@xxxxxxxxx>
>
> Hi all,
> I read in a book written by Richard Hull that increasing the top-load
> will increase Q-factor of a TC secondary. I assume there is a limit to
> this set by Q= 1/R sqrt(L/C). Has anyone either experienced this
> and/or know of any theory for why this happens?
>
> Thanks,
>
> Gavin
I mentioned this effect a few weeks ago. Going from no topload to a
certain amount of topload (depending of course on the secondary
design :( increases the current flowing in the top turns of the coil
which adds to the effective inductance. Beyond a certain point, the
L/C ratio starts degrading the Q again. It happens in practice - I've
measured it many times.
Malcolm