Re: DC Resonance Charging Advice Sought

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

Original poster: "robert & june heidlebaugh by way of Terry Fritz <teslalist-at-qwest-dot-net>" <rheidlebaugh-at-desertgate-dot-com>

Dave. I have used DC to power my TC and other projects. I have added a RF
choke in series with my DC supply to disconect the power at the time of
firing. I use a 1" x 6" air core coil of 16 ga wire as a minimum. I have had
a lot of coments saying this is not enough, but it works for me with my
15/30 NST and rectifier as a source.
    Robert  H
-- 


 > From: "Tesla list" <tesla-at-pupman-dot-com>
 > Date: Mon, 11 Aug 2003 21:38:48 -0600
 > To: tesla-at-pupman-dot-com
 > Subject: Re: DC Resonance Charging Advice Sought
 > Resent-From: tesla-at-pupman-dot-com
 > Resent-Date: Mon, 11 Aug 2003 21:40:27 -0600
 >
 > Original poster: "S & J Young by way of Terry Fritz <teslalist-at-qwest-dot-net>"
 > <youngs-at-konnections-dot-net>
 >
 > Dave,
 >
 > I will comment on the need for PFCs.  I found they did not help at all with
 > my DC supply.  The reason I believe is because the filtering capacitance
 > gets reflected back as a much higher value across the primary, and so PFC is
 > already in place.
 >
 > By the way, the 7 uF smoothing capacitor is highly dangerous and much more
 > than you need.  The smoothing cap need only be about ten times your tank
 > capacitance.
 > --Steve Y.
 > ----- Original Message -----
 > From: "Tesla list" <tesla-at-pupman-dot-com>
 > To: <tesla-at-pupman-dot-com>
 > Sent: Monday, August 11, 2003 12:12 AM
 > Subject: DC Resonance Charging Advice Sought
 >
 >
 >> Original poster: "Dave Kyle by way of Terry Fritz <teslalist-at-qwest-dot-net>"
 > <dave-at-kyleusa-dot-com>
 >>
 >> Several months ago after being inspired by Steve Conner's very impressive
 > DC
 >> coil http://www.scopeboy-dot-com/tesla/index.html I started my own DC coil
 >> project. I was drawn to the very elegant power control permitted by DC
 >> resonance charging. Richie Burnett's site offers an excellent explanation
 >> and provided the designs rules that I have followed
 >> http://www.richieburnett.co.uk/dcreschg.html#resonant. Of course for the
 >> ultimate expression of DC resonance charging one only needs to look at
 > Greg
 >> Leyh's incredible Electrum http://www.lod-dot-org/index.html.
 >>
 >> I have now completed and tested to 8KVDC (without load) the DC power
 > supply
 >> which can be seen here:
 >> http://home.austin.rr-dot-com/dkyle/images/temp/dc_tesla_ps.jpg. For scale the
 >> base disk is two feet across. You will note the very large black power
 >> transformer, full wave rectifier and de-Qing circuit, smoothing capacitors
 >> with safety bleeders and grey charging inductor.
 >>
 >> Specifications are as follows:
 >> 4.700KVAC 775VA transformer (6.65KVDC rectified)
 >> 7uf -at- 10KVDC of smoothing capacitors
 >> 20Henry -at- 15KVDC inductor
 >>
 >> Under construction:
 >> ..02uf -at- 20KVDC cap
 >> 0 to 500bps RSG
 >> 4 inch x 25 inch secondary with 1400 turns of #26 gauge wire
 >> 6x24 inch toroid
 >> 15 turn primary (tuned at 11 turns)
 >>
 >> Advice needed on the following:
 >>
 >> 1.) I have yet to resolve the system grounding. Is it advisable to ground
 >> the center point of the main transformer for safety (like an NST)? Or
 > would
 >> it be better to simply ground the negative side of the DC power supply? Or
 >> let it all float and just ground the secondary?
 >>
 >> 2.) I am assuming this transformer is not shunted (current limited) but
 >> short of dismantling it how can I tell? DC resonance charging is self
 >> current limiting so that will not be an issue but I would like pull
 > current
 >> slightly higher than the transformer's rating.
 >>
 >> 3.) Assuming the transformer is not shunted would there be any benefit to
 >> adding PFC caps?
 >>
 >> 4.) I have noticed in some of the very few DC coils documented on the net
 >> that a clamp diode and air inductor are sometimes added to the charging
 >> circuit presumably to protect the supply and caps from over voltage and
 >> transients. Can anyone comment on the need for this?
 >>
 >> Dave
 >>
 >> =========================================
 >> Dave Kyle
 >> Austin, TX USA
 >> Email: dave-at-kyleusa-dot-com
 >>
 >>
 >>
 >
 >