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From: John Woodgate
Subject: Re: How to make/solder a circuit fast?
Date: Tue, 24 Sep 2002 21:38:21 +0100
Organization: JMWA Electronics Consultancy
Reply-To: John Woodgate
NNTP-Posting-Date: Tue, 24 Sep 2002 21:58:27 +0000 (UTC)
X-Newsreader: Turnpike (32) Version 4.01 <5Z8C9wtxbnpWyFnyfFzqmVF739>
I read in sci.electronics.design that The little lost angel wrote (in <firstname.lastname@example.org
t.sg>) about 'How to make/solder a circuit fast?', on Tue, 24 Sep 2002:
>When I was reading up on Power Factor Correction, one of the things
>that came up was that capacitors can be used to provide PFC. Since PFC
>was explained with things doing with inductance and what not, I
>thought maybe the capacitors would buffer against inductance?
'Buffer' is the wrong word. In power-factor correction, an inductive
load draws a current that is lagging the voltage. This current can be
resolved into an in-phase current and one that lags the voltage by 90
degrees. A capacitor across the load draws a current that *leads* the
voltage. This current can be resolved into an in-phase current (very
small; due only to losses) and one that leads the voltage by 90 degrees.
With the right value capacitor, these currents at 90 degrees phase can
be made equal and opposite, thus adding to zero. The in-phase currents
remain, giving a power factor of 1.
Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk
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