Re: Suggestion on Power Supply?

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

Original poster: "Terry Fritz" <teslalist-at-qwest-dot-net>

Hi Jeremy,

At 11:03 PM 5/3/2003 -0700, you wrote:
>..........
> >
> > 1/2 x 30e-9 x 21000^2 = 6.615 Joules for each
> > firing.  Just divide to find
> > the number of firing per second needed to get 4040
> > watts
> >
> > 4040 / 6.615 = 610 BPS
>
>Okay, I think you've lost me ... how does
>
>P / J = B / S ?
>
>Given that a 'break' contains many variables
>such as gap resistance, "on" time etc... that
>certainly affect the rate and quanitiy of
>energy moved.

Power = Joules/bang x BPS   thus   Power / Joules/bang = BPS



> > However.........  This would
> > be an asynchronous
> > gap.  It will fire over the average of the voltage
> > not just at the
> > peaks.  Therefor you need to fire at twice that BPS
> > to get the power you
> > need or 1220 BPS
>
>I didn't start at John Freau's formula and work
>backwards to obtain the mechanics. Ultimately
>I'm not too concered with streamer length as I am
>with the overall synergy of the entire system.
>(Although, long streamers aren't bad at all!)
>
>I calculated 270mA would be required to charge the
>.03uF capacitor up to 21,000V every
>8.3333 ms.

15000 x 0.270 = 4050 watts

If you have a sync gap firing at 8.333mS (120BPS) then each bang could be:

4050 / 120 = 33.75 joules

33.75 joules, 21000 volts....

J = 1/2 x C x V^2  So  33.75 = 1/2 x C x 21000^2    C = 153nF.

>I would then set my SRSG to fire at
>every 8.3333ms, that is, 120BPS -- 90 degrees out
>of phase with the 60Hz AC peaks. In order to
>accomplish this rate of charging for the capacitor,
>a 5KVA pole pig is the closest that will do.
>(14400V * .270 = 3.8KVA ) How then, if it takes
>8.3333ms to charge the capacitor fully, would it be
>possible to do more than 120BPS and still get the
>full 21,000V out of the capacitor? (without
>upping the supply amperage...)

A smaller cap could charge much faster allowing a higher BPS rate.  The 
trick would be to still keep the system synchronous.  There are suggested 
timings of 240 BPS and 480 BPS too.  Jeff P. sent this chart in awhile back:

http://hot-streamer-dot-com/TeslaCoils/Misc/kVA_SRSG_Timing_Chart.gif


>I would think that the smaller cap/610BPS
>combo would lead to many purple short streamers
>dancing all around the toroid. High voltage
>because the smaller caps charge up real
>fast, but not much amperage in each discharge
>enough to penetrate any significant length of air.
>But plenty of them!

Not sure about that...


>Now a larger cap/120BPS, not as many streamers
>as the above...but when they do show up, look out...
>long white hot arcs.
>
>All of this is assuming a proper toroid of the same
>size in each case. (not too big, not too small...)
>
>Their power both is equal to 4000 watts, one trades
>streamer length for streamer quantity, and the other
>vice versa... which one do you think John's formula is
>based on?

I think John's formula is based on 120 BPS but it seems to work well for 
most disruptive coils.

Cheers,

         Terry