Re: chokes

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

Original poster: "Luc by way of Terry Fritz <twftesla-at-qwest-dot-net>" <ludev-at-videotron.ca>

Hi Ed,

Tx for the input, yes the result need to be taken as they are
simulation and it is impossible for a computer to considered all
the parameter especially with chaotic simulation.

Cheers,

Luc Benard 


Tesla list wrote:
> 
> Original poster: "Ed Phillips by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<evp-at-pacbell-dot-net>
> 
> Tesla list wrote:
> >
> > Original poster: "Luc by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> <ludev-at-videotron.ca>
> >
> > Hi Ed,
> >
> > When I do a tesla coil simulation in electronic workbench, for
> > gap I used a voltage dependent switch in Seri with a small
> > resistor, I set the "on" voltage at 10 kv and the "off" at 200 v
> > but it's a poor simulation of a gap were the resistance vary with
> > the current and these variation are not instantaneous because
> > it's take time to ionized the gas in the gap and for the gap to
> > recovering. What do you used?
> >
> > Cheers,
> >
> > Luc Benard
> 
>         I'm doing essentially the same thing, with two voltage-controlled
> switches in parallel, with one reversed to handle negative voltages.  I
> connect the "coils" to the capacitor side of the series resistor.  The
> transformer is simulated by a resistor and capacitor in series with the
> voltage source.  Resistor value is same as measured on real NST with an
> ohmmeter, and inductance is inductance is that required to get a
> reactance of the rated open-circuit voltage divided by the rated
> short-circuit current.  Not good enough for working the full problem,
> but I think it is pretty good for just simulating capacitor charging and
> discharging.  When I set it up with approximate transformer parameters I
> observe the same sort of behavior I get when I run my coil from a
> variac.  By adjusting the input voltage it is possible to go from one
> spark per several cycles of the AC input to many sparks per cycle, with
> some voltages giving stable firing and some appearing chaotic with no
> steady state pattern.
> 
>         One difficulty I get is that the simulation can give a
steady-state DC
> component of the output voltage and that, of course, is impossible.
> Doesn't seem to invalidate the results - guess computers can be fooled
> into believing anything!
> 
> Ed