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From: "Phil Allison"
Subject: Re: PSU ripple current
X-Newsreader: Microsoft Outlook Express 5.50.4522.1200
Date: Wed, 15 Jan 2003 13:50:42 +1100
NNTP-Posting-Date: Wed, 15 Jan 2003 13:39:59 EST
Organization: Telstra BigPond Internet Services (http://www.bigpond.com)
"Mike Monett" wrote in message
> John Woodgate wrote:
> > I read in sci.electronics.design that Phil Allison
> > wrote (in ) about 'PSU
> > ripple current', on Tue, 14 Jan 2003:
> > >BTW If the ripple voltage were a really a symmetrical triangle wave
> > >by differentiation the ripple current in the cap *must* be a square
> > >value equal to the DC load current.
> > >
> > > The normal ripple wave is a sawtooth with steep rise and
> > >fall and this differentiates to a pluse wave with a mark space ratio of
> > >about 3:1. The average of this wave must be zero for the cap to stay
> > >the same voltage so the charge current must be 3 times the
scharge - ie
> > >+3 amps for 2.5mS followed by - 1 amp for 7.5mS.
> > >
> > > This would have an rms value of 1.73 amps.
> > He keeps doing this: super stuff. But WHY can't he refuse to get
> > involved in flame wars?
> > Regards, John Woodgate
> A three decimal place answer based on an estimate may not be an example
> of good engineering practise.
** Another autistic dickhead just popped up.
> What I fail to see is why this is even a discussion.
** Did you even look ?? The OP might just give a clue.
Toss this in SPICE and you have all the answers to any question, and
everyone get the same
** Dangerous notion - similar to fascism. Computer geeks frighten me.
Move on to the next problem. That is good engineering practise.
** You are no engineer - unless you put "software" in front of the word.
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