Re: OLTC update - A problem!

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "jimmy hynes by way of Terry Fritz <twftesla-at-qwest-dot-net>" <chunkyboy86-at-yahoo-dot-com>


with perfect tuning all the energy should go to the secondary, no matter what
the impedance is. you shouldnt get smaller streamers with the same input power
and less loss in the gap. if you run the coil without the secondary the energy
could go back into charging up the caps, or into the voltage suppression for
the igbts. you could make a circuit that would only quench the gap when the
reverse recovery diodes are conducting, that way you dont lose any energy. 

 Tesla list 
>
> wrote: 
> Original poster: "Terry Fritz" 
>
> Hi Jimmy,
>
> It is really weird, I can take the secondary off and run the coil. The 
> energies are much the same, but without a secondary, where in the world 
> does the power go?!
>
> I guess I should run the coil at full power to "find out", but I think the 
> answer would be "unpleasant" :-)) My guess is that the IGBTs will absorb 
> the power if nothing else does. In a conventional coil that is run without 
> a secondary in place, the spark gap gets much brighter, hotter, and louder. 
> I suspect that is still true in the case of the IGBT gap, but the results 
> are "badder". If a very low loss primary system "has" to dissipate 500 
> watts of power, my guess is that the IGBTs will step forward and take it.
>
> there is still much to ponder in all this...
>
> Cheers,
>
> Terry
>
>
>
>
>
> >At 07:55 PM 8/28/2! 002 -0700, you wrote: 
> > 
> > 
> > 
> >impedance of the secondary shouldn't have any effect on the output 
> >efficiency. the impedance would have an effect on the amount of power for a 
> >given voltage, but in this case the voltage driving it rises with the 
> >impedance. for a fixed k, the voltage driving the secondary because it sees 
> >more turns. besides where would the power go? with a ss spark gap you should
> >be able to do better. i cant see how impedance would matter, but i could be 
> >wrong. 
> >
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> JImmy
>