Re: MMC bleed resistors

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

Original poster: "Robert Jones" <alwynj48-at-earthlink-dot-net> 

Hi,
----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Friday, March 12, 2004 8:32 PM
Subject: Re: MMC bleed resistors


 > Original poster: "Virtualgod" <mike.marcum-at-zoomtown-dot-com>
 >
 > Even if they don't blow up like mine did (10kv 2500 pF each, big ones),
 > they're gonna get hot and waste power compared to pp plastic dielectric.
 > Also, the pulses will erode the "plates", some aluminum/silver compound
 > that's only a few microns thick, unless it's some tiny coil running with
low
 > pulse current (might work with a 4/20 nst with a high primary L, but I
would
 > expect no more than 4-5" with ceramic caps). They make nice multiplier or
 > filter caps though.
 >

Yes its easy to imagine a small coil has a lower peak current per cap.
Actually the peak current in a cap of an MMC  is proportional to charge
voltage on that cap and frequency of the primary.  So in general because
small coils have a higher frequency than big ones a small coil will have a
high peak current.  For the same reason doubling the number of strings does
not reduce the peak current in any of the caps.  The peak current can only
be reduced by reducing the charge voltage and or frequency.

Bob
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