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RE: I'm going to need help with a 34kV power supply



Original poster: "Wall Richard Wayne by way of Terry Fritz <twftesla-at-qwest-dot-net>" <rwall-at-ix-dot-netcom-dot-com>

Joe,
 
One of the nice things about these DC power supplies is that you do not have to
link them to the 60 Hz line frequency or one of it's harmonics.  You can shape
the DC pulse and frequency with your driver circuit.  By using the appropriate
RC time constants and charging currents you can precisely charge the cap and
its firing through a single static gap.  An infinite number of dwell times and
frequencies are available.  All made available through the driving circuit. 
You should be able also to control the charging voltage.  Maybe a good idea to
start out with ~ 20 kV.
 
RWW
>
> ----- Original Message ----- 
> From: <mailto:tesla-at-pupman-dot-com>Tesla list 
> To: <mailto:tesla-at-pupman-dot-com>tesla-at-pupman-dot-com
> Sent: 11/2/01 1:51:08 PM 
> Subject: I'm going to need help with a 34kV power supply
>
> Original poster: "by way of Terry Fritz
> <<mailto:twftesla-at-qwest-dot-net>twftesla-at-qwest-dot-net>"
> <<mailto:jduva-at-baytechnologies-dot-net>jduva-at-baytechnologies-dot-net>
>  
> Greetings, all!  :)
>    A while back, I got my hands on a 34kV 120ma pulsed DC power supply from
> a laser assembly.  To date, I've only ever used it in a jacob's ladder and
> it was able to span a 7" gap pretty easily.
>    That said, I'm now itching to use that pretty gold box to power a larger
> tesla coil.  I realize that the extremely high voltage from this power
> supply is going to cause some major design problems with the primary
> circuit.  I have enough pulse caps to hold off 140kV and give me 7.5nf.  The
> caps will obviously have to be immersed in oil, the connections and wiring
> between all of the components will all have to be heavily insulated and
> probably coated with an insulator to keep corona losses down, but I'm not
> sure about the construction of the primary coil.  I'll most likely use 3/8"
> copper tubing, but how far apart should the turns be spaced?.
>    The spark gap is another problem.  I'd like to use an async rotary with a
> good bit of radial velocity (3450rpm, instead of 1725rpm), but what would be
> good to use for the stationary electrodes so that they won't glow with
> corona and ionize the air around the gap excessively?  Would a nice fan take
> care of that, or should something like a small doorknob be used?
>    If I go with a static gap, I worry about corona losses at the edges of
> the copper pipes, if copper pipes are the best choice for this gap.
>    How do you feel about a triggered gap?  The trigger electrode would have
> to be powered with a significant amount of voltage, given that that tank
> circuit will be powered with a 34kV power supply.
>    Any advice on how to properly design and build such a high-voltage beast
> would be greatly appreciated.  I won't mind comments about safety, either,
> as I don't want to miss any issues on safety just because I hadn't
> remembered them at the time.
>  
> Thanks,
> Joe Duva
>  
>  
>  

 
--- Richard Wayne Wall
--- <mailto:rwall-at-ix-dot-netcom-dot-com>rwall-at-ix-dot-netcom-dot-com