Re: RSG and NST --> ARSG vs. SRSG

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

Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>" <FutureT-at-aol-dot-com>

In a message dated 7/21/02 9:54:34 PM Eastern Daylight Time, tesla-at-pupman-dot-com
writes:


>
> Hi John, all
>
>        You bring up some good points there, althought some are hard to see in
>
> my head... But as far as efficieny goes, has anyone tried , or someone 
> explain the 
> efficiency comparison?  
>        
>        Also, I thought that since the capacitor would be discharged at a spot
>
> other than the ~ peak, it would not be fully charged. 



Jonathon,

What I said in my email is that it will charge fully for it's position
on the sine wave.  So if it fires at a low position on the sine wave,
then it will have a lower voltage on the cap.  So the cap is fully
charged for this situation.  It really depends on how you define
"fully charged".  But having a fully charged cap is not that 
important anyway, because if the break rate is higher, then
you get the power throughput that way, via break rate.  The
bang size of each cap discharge will be lower, but there will
be more of them in a given time period.  I've found this to
be less efficient than firing at the peaks, but others have
found different results, so I guess there's some controversy
there.

My confusion may be 

>
> becuase I dont' know how many cycles it generally takes for a standard (2-3 
> X) LTR cap to be charged... If it is only one half cycle (the other half does
>
> nothing, correct? Because it is opposite polarity to the cap.), 




Both polarities are used.  The cap charges in a half
cycle, then the gap fires.  Then it charges to the opposite polarity and
the gap fires again, and so on.

then I see no 

>
> reason for an Asynch gap. But If it is more than cycle (which I think it is,)
>
> I can see where you are coming from. But how could the voltage go extra high?



The voltage can only go very high in a resonant condition with a matched
value cap.  LTR avoids the highest voltages.  This is why I mentioned
in my other email that some of the talk of NST destruction from 
async gaps may be just talk from the old days of matched value
cap use, and the use of chokes, etc.  There is another factor though,
if the gap fires at certain points, higher currents may be pulled
though the NST and overheat it.  This can occur with sync rotaries
if they're not phased correctly, maybe it can happen to some 
degree under certain conditions with async gaps.  I mentioned
various reasons for using the async gap in my other email.

Cheers,
John

>
> Just like freezing or heating something, how could it go beyond the source's 
> power (in this case the NST, MOT, or PIG's voltage). unless the cap adds 
> voltage back into the circuit or something...
>        
>        I'm not trying to debate which one is better, A or S. I'm just a bit 
> confused.
>        
>        I wonder if someone out there who understands this could animate it 
> somehow...Flash, animated GIF???
>
> Thanks for all your help everyone,
>
> ---------------------------------------
> Jonathon Reinhart