Re: [TCML] Permanent Magnet GDT(?)

[Michael Twieg <mdt24@xxxxxxxx>]

Having a permanent magnet core wouldn't cause any difference on the output
of the transformer.  It simply biases the core material with a large initial
flux.  The AC component of the flux swing would not change, and that
determines the output.  Using a magnetic core would just be likely to
saturate the core sooner.  Also it would probably buzz quite a bit.

-Mike

On Mon, May 30, 2011 at 3:48 PM, Christopher Karr <chriskarr4@xxxxxxxxxxx>wrote:

>
> Good day, Everyone,
>
> I've been pondering this topic for some time, now, and I've been wondering
> if it were reasonable to use a ferrite permanent magnet (in toroidal shape)
> as a core for a GDT.
>
> My thinking is based on the fact that transformer action is based on
> changing magnetic flux, so if the primary of such a GDT were driven in a
> single-ended configuration with the magnetizing current opposing the natural
> flux of the magnet, during the 'dead time' of the signal, a full
> flux-reversal would be made, naturally, by the magnetic material. This would
> - in my mind - give rise to an extremely simple push-pull gate signal.
>
> The only problem I see, prior to receiving your answers, is the complete
> lack of control over one half of the waveform, since it would be determined
> solely by the properties of the magnetic material.
>
> Feel free to make corrections, or even tell me I'm *way* off-base. If I
> knew for sure, I wouldn't be asking. *wink*
>
> Thank you for your time,
>
> Best wishes,
>
>  - Christopher
>
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