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From: Mike Monett
X-Mailer: Mozilla 2.02 (Win16; I)
Subject: Re: PSU ripple current
Date: Tue, 14 Jan 2003 21:03:04 -0500
NNTP-Posting-Date: Tue, 14 Jan 2003 21:02:30 EST
Organization: Bell Sympatico
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 then
> >by differentiation the ripple current in the cap *must* be a square wave of
> >value equal to the DC load current.
> > The normal ripple wave is a sawtooth with steep rise and slower
> >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 at
> >the same voltage so the charge current must be 3 times the discharge - 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.
What I fail to see is why this is even a discussion. Toss this in SPICE
and you have all the answers to any question, and everyone get the same
answer. Move on to the next problem. That is good engineering practise.
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