Re: SPDT SRSG

• To: tesla-at-pupman-dot-com
• Subject: Re: SPDT SRSG
• From: "Jim Lux" <jimlux-at-jpl.nasa.gov> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
• Date: Sun, 02 Jan 2000 10:20:41 -0700
• Approved: twftesla-at-uswest-dot-net
• Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

> First I'll go on with the thought.  The gap losses are proportional to
current
> squared.

I would expect more proportional to current.  The gap is a constant voltage
drop of a few tens (or a hundred) volts ("cathode drop") plus a nonlinear
resistive component that goes down as the current goes up (and the arc gets
bigger).  In any case, modeling it as a resistor is probably NOT the best
way to deal with it.


  The NST charging current squared is 0.060^2 = 0.0036.  The primary
> circuit current is probably around 10 amps RMS so 10^2 = 100.  Thus, the
loss
> in the "firing gap" is 100/0.0036 = 27777 times higher than the
"charging"
> gap.  The charging current gap resistance may be higher (and probably is)
than
> the firing current so the loss is higher but it should not matter...

> 
> Now that problem...  The NST can only supply say 60mA  Thus it will not
charge
> the cap in the time only a brief point presentation would give.  The NST
needs
> the full "non-firing" cycle time (about 98% of the cycle) to recharge the
cap. 

However, for Steve's suggestion of using it with a pole transformer?  Or
some sort of resonant charging scheme with the gap serving instead of the
diode?

> 

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