Physical questions

Robert G. Brown rgb at
Mon Jan 13 13:38:28 PST 2003

On Mon, 13 Jan 2003, Paul English wrote:

> Aah - good thing someone knows what they are doing. :-) I'll stick with 
> the idea of individual power supplies then I guess, and one big UPS. 

Individual power-factor-correcting power supplies, if you can find them.
The problem Greg alluded to (browning out due to high current on the
supply lines themselves) can affect the AC lines as well for switching
power supplies, leading to harmonic distortion and possibly unhappy
systems when you're running a circuit full of systems close to line
capacity.  PFC supplies spread out the current draw so it more closely
matches the voltage cycle.  They save energy, too.


Robert G. Brown	             
Duke University Dept. of Physics, Box 90305
Durham, N.C. 27708-0305
Phone: 1-919-660-2567  Fax: 919-660-2525     email:rgb at

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