Re: Spark Gap Sustaining Current (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

---------- Forwarded message ----------
Date: Fri, 05 Oct 2007 11:56:33 -0500
From: Crispy <crispy@xxxxxxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: Re: Spark Gap Sustaining Current (fwd)

Yep, that's it.  Thanks.

On Fri, 2007-10-05 at 08:53 -0600, Tesla list wrote:
> ---------- Forwarded message ----------
> Date: Fri, 05 Oct 2007 09:19:01 -0500
> From: Bert Hickman <bert.hickman@xxxxxxxxxx>
> To: Tesla list <tesla@xxxxxxxxxx>
> Subject: Re: Spark Gap Sustaining Current (fwd)
> 
> Tesla list wrote:
> > ---------- Forwarded message ----------
> > Date: Thu, 04 Oct 2007 19:00:20 -0500
> > From: Crispy <crispy@xxxxxxxxxxx>
> > To: Tesla list <tesla@xxxxxxxxxx>
> > Subject: Re: Spark Gap Sustaining Current (fwd)
> > 
> > No, it's not really like that schematic.  I'm horribly at ascii art
> > schematics, and I can't draw in computer paint programs, but a much
> > better description of the simplified circuit is below.
> > First of all, the ARSG is not as you have depicted it.  This ARSG would
> > have 3 poles, instead of two.  There would be a central contact which
> > would alternate between two other stationary electrodes as it rotated.
> > Electrically, this behavior is similar to a SPDT switch that is being
> > switched back and forth very quickly.  In the below circuit description,
> > I will refer to the central pole as "central pole" and the poles between
> > which it alternates as "auxiliary poles".
> > 
> > 
> > - The transformer (12/30 NST) is connected to the 120VAC wall current.
> > - The output of the transformer is rectified by a hv bridge rectifier.
> > - The ~400nF capacitor that you have labeled Cs in your diagram is
> > connected across the outputs of the bridge rectifier.
> > - There is a series circuit from here composing the charging circuit.
> > It connects the + terminal of Cs -> Static Gap -> De-Qing diode -> one
> > auxiliary pole of the special ARSG -> (alternating via the rotary
> > contact) central pole of the special ARSG -> Tank Capacitor -> Charging
> > inductor -> - terminal of Cs
> > -  The primary coil is connected from the other auxiliary terminal of
> > the ARSG to the junction between the tank capacitor and the charging
> > inductor.
> > 
> > The function of this special ARSG is to physically interrupt the
> > charging circuit from the tank circuit when the tank circuit is
> > resonating.  This prevents all of the loss and problems associated with
> > shorting out the power supply while the tank circuit resonates.
> 
> I think I have it. Use a non-proportional font to see properly. The ARSG 
> alternates between position A - open - position B - open, etc...
> 
>              Static   |\ |
>    + ----o----o  o----| >|-----o     o---------
>          |    Gap     |/ |      \              |
>          |             DQ     A  \    B        O
>    HV  + |                        o            O  Lp
> DC In -----                      |            O
>        ----- Cs                   |     | |    |       Lc
>          | 0.44uF                  -----| |----o-----OOOOOOO---
>          |                              | |          =======   |
>          |                               Cp                    |
>          |                                                     |
>    - ----o-----------------------------------------------------
> 
> Is this the circuit you're discussing?
> 
> > The function of the static gap is different from that of a normal static
> > gap.  The gap in this instance should not be considered as a voltage
> > controlled switch.  The gap's increased propensity to fire a second time
> > immediately after a first firing must be considered.  The gap functions
> > to pulse power from Cs into the rest of the charging circuit, providing
> > much higher power during several subsequent iterations of the ARSG than
> > is drawn RMS from the wall.  The special ARSG does NOT fire during the
> > majority of its iterations (during these iterations Cs is charging).
> 
> Bert