Re: Residual charge left on caps

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

Original poster: "Crow Leader" <tesla-at-lists.symmetric-dot-net> 

Film caps are still pretty much symmetrical in construction. Do any of the
cap modeling people do take into account hysteresis? A "discharged" can can
still maintain a charge.

I never got a good reason as to why I shouldn't use my utility company power
factor cap as a filter for DC use other than without grading resistors, it's
not a good idea because of voltage imbalances between the sections
(according to the manufacturer). I plan to see pretty high ripple, so I'm
not too worried.



KEN

----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Thursday, January 15, 2004 12:33 PM
Subject: Re: Residual charge left on caps


 > Original poster: "June Heidlebaugh" <rheidlebaugh-at-desertgate-dot-com>
 >
 > When the shape of two conductors is different rectification may occur. A
 > sharp point tends to emit electrons and a half sphere tends to collect
 > electrons so a cup and point together forms a high voltage low current
 > rectifier. I use this method to rectify the output of a TC.     Robert   H
 >
 > ----- Original Message -----
 > From: "Tesla list" <tesla-at-pupman-dot-com>
 > To: <tesla-at-pupman-dot-com>
 > Sent: Wednesday, January 14, 2004 7:54 AM
 > Subject: Re: Residual charge left on caps
 >
 >
 >  > Original poster: "Gerry Reynolds" <gerryreynolds-at-earthlink-dot-net>
 >  >
 >  > Hi Gary,
 >  >
 >  > In practice, we experience the effect with a gazzion cycles.  I wonder
if
 >  > more simulation cycles need to be done before seeing an accumulation.
 > Also,
 >  > could you explain coronal rectification?  Does it have something to do
 > with
 >  > the dialectric tensor?
 >  >
 >  > Gerry R
 >  > Ft Collins, CO
 >  >
 >  >
 >  >
 >  >  > Original poster: "Lau, Gary" <gary.lau-at-hp-dot-com>
 >  >  >
 >  >  > A while back I performed some MicroSim simulations to try to see
what
 >  > could
 >  >  > be causing such a thing to occur.  I did include unequal leakage
 >  >  > resistances as well as unequal capacitances, but I was unable to get
 > any
 >  >  > cumulative charge to build over multiple mains cycles.  It's got to
be
 >  >  > something non-linear, like coronal rectification.
 >  >  >
 >  >  > Gary Lau
 >  >  > MA, USA
 >  >
 >  >
 >
 >
 >