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Pastimes : Dream Machine ( Build your own PC ) -- Ignore unavailable to you. Want to Upgrade?

To: PMS Witch who wrote (10056)	1/28/2000 5:39:00 PM
From: Dan Duchardt	Read Replies (1) \| Respond to of 14778

PW, I knew it would be dangerous to post my little lesson :) Going from general principles to design considerations would be even more dangerous for me. I are not a en-gin-eer. What you are talking about really is making an adjustment to the internal impedance of the UPS; the UPS cannot change the impedance of any external load. I expect, but don't know for sure, the UPS designers would attempt to match their device for the best performance with the most likely loads they will encounter. It probably would not be cost effective to make it adaptable. Still, it's entirely possible that they have some protection circuitry in place to keep the thing from blowing up if you connect something it is not designed for, like a short. Dan

To: PMS Witch who wrote (10056)	1/30/2000 8:52:00 PM
From: Howard R. Hansen	Read Replies (2) \| Respond to of 14778

Can a UPS introduce a 'variable capacitance' into the load to correct the power factor when loads become overly inductive? One would think this could extend the time the UPS could deliver. I don't know how you could correct the power factor to extend the run time. But in one respect batteries and capacitors are similar. They both store energy. You could use a bigger capacitor to extend the run time or a bigger battery. As batteries have a much higher watt/$ energy storage ratio than capacitors designers naturally use bigger batteries to extend the run time.