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Re: Auto Tuning A TC
Hi Steven,
> Original Poster: Steven Ivy <adder_black_the-at-yahoo-dot-com>
>
> In the best of all worlds a TC ought to just come up tuned perfectly
> the first time. Well I think such a dandy situation is quite possible.
> I think that at least one variable and indeed the tuning of all
> adjustable parameters on a TC could be made automatic by the use of
> closed loop servo control systems. The first and most obvious
> parameter for adjustment automation would be the rotation rate of an
> async-RSG by senseing the output voltage or current of the secondary.
> My idea for a voltage sense element is a long daisy chain of high ohm
> resistors soldered together and then potted in wax or plastic inside a
> long plastic tube. This should allow you to sense the voltage output
> of a TC by direct sampling at the output terminal. After you have
> sampled the output you would rectify and filter the output and then
> condition that signal to where it could be used to either slow or
> speed the RSG. As the TC output voltage goes up while the RSG speeds
> up the control voltage will tell the RSG to go faster and faster until
> the RSG is spinning too fast and the TC output voltage will again
> begin to drop at this point the sampled voltage will feedback through
> the control system and in turn control the RSG to slow down. With the
> right time constants and safety considerations the system should auto
> stablize to the optimal output voltage for a given system. I guess
> that many of you may have seen this sort of thing done before but I
> was wondering if any of our more experienced coilers are now using
> such a systems on their coils and if so what impressions do you have
> of these sort of feedback systems? Obviously this same sort of system
> could be used to adjust gap widths and primary inductance or coupling.
> Just use your imagination.
>
> I figured that this sort of system would be pretty common place but I
> haven't read of anyone using this approach for a TC and I was just
> curious why not.
Possibly because output voltage drops as spark current increases.
?
Malcolm