Re: [TCML] Primary Capacitors

[DC Cox <resonance@xxxxxxxxxxxx>]

I stock 60 nF and 100 nF (0.1 uF) 80 kV high-Q energy discharge caps ---
used on all of our large coils.

Contact me off-list for a datasheet.

Dr. Resonance





On Tue, Apr 13, 2010 at 9:55 AM, Thomas Schmit <Thomas.Schmit@xxxxxxx>wrote:

> Thanks! Glad to hear this now and not after ordering a bunch of little caps
> ;-) Looks like I'm back to shopping around.
>
> Out of curiosity, wouldn't the peak current of a string of caps be
> multiplied by the number of strings in parallel? So you could get to the
> 3500 amp by having roughly 8 strings in parallel? Of course, you still have
> all the connections to worry about.
>
> Tom
>
> ________________________________
>
> From: tesla-bounces@xxxxxxxxxx on behalf of DC Cox
> Sent: Tue 4/13/2010 11:04 AM
> To: Tesla Coil Mailing List
> Subject: Re: [TCML] Primary Capacitance Calculations - "Black Boxes"
>
>
>
> Using MMCs with a pole xmfr will present problems.  Too many lead
> connections lead to high relative inductance thus limiting peak currents in
> the discharge cycle.  Also, MMCs are not designed to handle the large peak
> currents.
>
> Best to use a hi-Q factor energy discharge cap rated to do the job ----
> minimal internal connections that are accomplished with the extended foil
> design connections.  Typical is a wide foil area with very low inductance
> connections which permit high peak currents.
>
> A typical pole xmfr powered coil, operating with a .06 uF 80 kV energy
> discharge capacitor will see peak currents of 3,500 Amps (or more) in the
> discharge cycle.  Typically these pulses occur at around 400 pulses per
> second for best coil performance which again would be a serious strain for
> an MMC which is rated at 432 Amps peak (max).
>
> Dr. Resonance
>
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