Talk:Power-factor correction

Article should be Power factor correction as per capitalization rules. - Omegatron 14:59, August 15, 2005 (UTC)

PFC exists outside the world of computer power supplies. Needs expansion. - Omegatron 14:59, August 15, 2005 (UTC)

"It is an indicative tell-tale sign of a passively PFC'd computer power supply, that the AC input voltage (110V / 230V) needs to be set manually."


 * As opposed to what? Removed for now. - Omegatron 14:56, August 15, 2005 (UTC)

" This form of correction is considered fairly rudimentary these days, and it can only reach the maximum power factor efficiency of about 75%."


 * Not sure where that came from. power factor can be made exactly 1 with the right values, no?  Removed for now.  If this is a common myth in computer supplies, we should debunk it. - Omegatron 16:08, August 15, 2005 (UTC)


 * Probably related to switching power supplies, like triac wave chopper things. - Omegatron 16:37, August 15, 2005 (UTC)

"Computer power supplies with A-PFC theoretically accept all ranges of AC input voltages, m"


 * Huh?? What does PFC have to do with AC input voltages?  Unless I'm missing something (always possible), this article is confusing PFC with compatibility with international power supplies (120 V vs 230 V), and apparently there are computer PSUs that automatically detect the power line voltage and adjust their step-down transformer accordingly?  These ideas aren't connected at all, are they? - Omegatron 16:16, August 15, 2005 (UTC)


 * They are connected in that if you do active PFC, there is typically a boost-mode preregulator that makes the DC rail. It often turns out to be easy to tolerate a wide input voltage there. If you don't do active PFC, then the traditional thing to do is to replace the preregulator with a circuit that is configurable (via the voltage range switch) to be either a full-wave rectifier (at 220), or a voltage doubler (at 110).66.30.201.209 00:11, 5 February 2006 (UTC)

Page Rewrite
THe subject matter needs rewriting to improve flow, understanability and accuracy. I will have a go if no one objects.Light current 16:25, 15 August 2005 (UTC)

Aha! Here is a link that this information was probably taken from:

''The preferable type of PFC is Active Power Factor Correction (Active PFC) since it provides more efficient power frequency. Because Active PFC uses a circuit to correct power factor, Active PFC is able to generate a theoretical power factor of over 95%. Active Power Factor Correction also markedly diminishes total harmonics, automatically corrects for AC input voltage, and is capable of a full range of input voltage. Since Active PFC is the more complex method of Power Factor Correction, it is more expensive to produce an Active PFC power supply.''

Has to do with switch-mode power supplies instead of the standard sine waves and reactances. Still, the "automatically corrects for AC input voltage" is not power factor correction, which probably confused someone. - Omegatron 16:34, August 15, 2005 (UTC)
 * As there are two areas wher PFC takes place: ie the electricity supply companies and the users, I suggest that we keep the split as I arranged it so that the article could be split later.(if requd) Obviously, it nees a shrt defn at the top that I have not got round to writing yet. So could we put it back under the 2 headings please?? Light current 17:33, 16 August 2005 (UTC)


 * Sure. Put the general description there first and then start a heading for the power company stuff. - Omegatron 23:25, August 16, 2005 (UTC)

TOC
Is there a reason for having the TOC right sided? I find it distracting and awkward, personally. —Preceding unsigned comment added by 59.96.12.182 (talk) 05:23, 1 March 2008 (UTC)