Re: [TCML] Primary Capacitors

[Phillip Slawinski <pslawinski@xxxxxxxxx>]

DC,

Unless you go out of your way to add extra inductance to your MMC, it will
not be significant compared to the inductance of the primary, and will not
limit peak currents in a meaningful way.  Rather, it will contribute a small
amount of decoupled inductance.  It's not likely that ESR would limit peak
currents either, since charging voltages in a SGTC are usually tens of
thousands of volts, meaning you'd need tens of ohms of resistance to limit
peak discharge current.

-Phillip Slawinski


On Wed, Apr 14, 2010 at 00:08, DC Cox <resonance@xxxxxxxxxxxx> wrote:

> I never said it was not possible ---- but certainly not a good engineering
> approach when much better solutions are available.
>
> yes, it can be done, however, the small leads and many connections present
> significantly higher inductance (hence lower peak currents achieveable).
>
> Our caps and Maxwell caps are widely used to overcome this problem.
>
> Dr. Resonance
>
>
>
>
> On Tue, Apr 13, 2010 at 2:58 PM, <mddeming@xxxxxxx> wrote:
>
> >
> > Hi Tom,
> >
> > It is POSSIBLE to make a multi-KVA pig-powered coil MMC. For what may be
> > the largest MMC ever built, check out
> >
> >
> http://www.thegeekgroup.org/projects/high-voltage-projects/multiple-miniature-capacitor-array/array-assembly/
> >
> > I will not attest to the practicality of it (for other than brgging
> > rights), just the possibility of doing it.
> >
> > Matt D
> > In the interest of full disclosure:
> > 1) I do not sell, broker, or have any financial interest in the sale of
> any
> > type of Capacitors.
> > 2) I am a member of the Geek Group.
> >
> >
> >
> >
> > -----Original Message-----
> > From: Thomas Schmit <Thomas.Schmit@xxxxxxx>
> > To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
> > Sent: Tue, Apr 13, 2010 12:55 pm
> > Subject: RE: [TCML] Primary Capacitors
> >
> >
> > Thanks! Glad to hear this now and not after ordering a bunch of little
> caps
> > ;-)
> > ooks like I'm back to shopping around.
> >
> > ut of curiosity, wouldn't the peak current of a string of caps be
> > multiplied by
> > he number of strings in parallel? So you could get to the 3500 amp by
> > having
> > oughly 8 strings in parallel? Of course, you still have all the
> connections
> > to
> > orry about.
> >
> > om
> > ________________________________
> > From: tesla-bounces@xxxxxxxxxx on behalf of DC Cox
> > ent: Tue 4/13/2010 11:04 AM
> > o: Tesla Coil Mailing List
> > ubject: Re: [TCML] Primary Capacitance Calculations - "Black Boxes"
> >
> > Using MMCs with a pole xmfr will present problems.  Too many lead
> > onnections lead to high relative inductance thus limiting peak currents
> in
> > he discharge cycle.  Also, MMCs are not designed to handle the large peak
> > urrents.
> > Best to use a hi-Q factor energy discharge cap rated to do the job ----
> > inimal internal connections that are accomplished with the extended foil
> > esign connections.  Typical is a wide foil area with very low inductance
> > onnections which permit high peak currents.
> > A typical pole xmfr powered coil, operating with a .06 uF 80 kV energy
> > ischarge capacitor will see peak currents of 3,500 Amps (or more) in the
> > ischarge cycle.  Typically these pulses occur at around 400 pulses per
> > econd for best coil performance which again would be a serious strain for
> > n MMC which is rated at 432 Amps peak (max).
> > Dr. Resonance
> > _______________________________________________
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> >
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> >
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