questions. are todays switching-mode PSU still contributes line noise (and distortion/harmonics) to the main line at hte house? o suppressed na to from the psu itself.
should we also de-rate UPS to get better/optimal operation based on this load? i would assume UPSs are rated for "inductive" characteristic of switched mode supplies. the reason i asked, because we've always got busted UPS. perhaps due to overloading (?) or line frequency shifts from power generator (because we have some electricians that compensates voltage drop by speeding up the rpm of the genset). are the line frequecny shifts affects both UPS and switched-mode suppliies? thanks. --edel On 7/31/07, Orlando Andico <[EMAIL PROTECTED]> wrote: > Add up the total power the PSU can generate, using P = IV > > Determine I (current) on each voltage rail (V), it's printed on the PSU. > > e.g. 30A @ 3.3V = 99W > 15A @ 5V = 75W > > etc. and add them all up. This is the PSU's total power output. The > PSU will also have a plaque at the back which gives its power > consumption, something like 220V, 2A. This comes out to 440 > Volt-Amperes (which is different from Watts). You can assume a 0.707 > conversion from V-A to Watts. Then divide the total output power, by > the power consumed ( Volt-Amperes * 0.707 ) to get the efficiency. > > That said, switch-mode power supply technology is a mature, stable > science. So you won't see any glaring differences from one power > supply to the next. The differentiator would be in things like build > quality, the use of high-quality inductors, etc. But on paper they > will all look the same. > > > On 7/31/07, [C]hicken [G] od <[EMAIL PROTECTED]> wrote: > > With all this talk about PSU efficiency, how does one determine or measure > > the efficiency of a PSU. I'm scouting the market for a new box, myself. > _________________________________________________ > Philippine Linux Users' Group (PLUG) Mailing List > [email protected] (#PLUG @ irc.free.net.ph) > Read the Guidelines: http://linux.org.ph/lists > Searchable Archives: http://archives.free.net.ph > _________________________________________________ Philippine Linux Users' Group (PLUG) Mailing List [email protected] (#PLUG @ irc.free.net.ph) Read the Guidelines: http://linux.org.ph/lists Searchable Archives: http://archives.free.net.ph
