Re: SRSG break rate

["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 6/21/01 10:00:27 AM Eastern Daylight Time, 
tesla-at-pupman-dot-com writes:

> Original poster: "Steve White by way of Terry Fritz <twftesla-at-qwest-dot-net>" <
> slwhite-at-zeus.ia-dot-net>

Steve,

There are two peaks in a full sine wave.  One positive peak and one
negative peak.  100 or 120 bps operation takes advantage of these
peaks.  But the main benefit of 100 or 120 bps is not this, but 
rather the way that the sparks grow in the air over successive
bangs.  For a given amount of energy in the caps over time, 120
seems to be more efficient at producing long sparks from the work
I've done.  I found about a 20% benefit from using 120 bps over 240 bps.

  http://hometown.aol-dot-com/futuret/page3.html        (click on theory)

Cheers,
John 

>  
>  I have been following the posts on SRSG break rates. Some people seem to 
> think
>  100 BPS (50 HZ) or 120 BPS (60 HZ) is best. It seems to me that 200 BPS 
(50 
> HZ)
>  or 240 BPS (60 HZ) would be optimum. Here is why I think this. If you 
> examine a
>  single cycle of sine wave, there are 4 positions of maximum charging for a
>  capacitor. During the first 1/4 cycle (starting at 0 degrees), the cap 
would
>  reach its peak charge at about the 90 degree point of the sine wave. At 
this
>  point the cap should be discharged. Continuing to charge the cap past 90
>  degrees without discharge would not charge the cap any further because the
>  voltage is now decreasing towards 0 at the 180 degree point. After 
> discharging
>  at the 90 degree point, the charge cycle can begin again at the peak 
voltage
>  and continue charging until the 180 degree point is reached. At this 
point, 
> the
>  cap should again be discharged because after the 180 degree point, the 
> voltage
>  will go negative and the cap will not reach any higher charge. 2 more 
> discharge
>  points can be identified for the negative voltage at the 270 and 360 degree
>  positions. This reasoning assumes that the transformer can supply 
sufficient
>  current to fully charge the cap in 1/4 cycle. If not, then higher break 
> rates
>  may be better.