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So about PFC.........

That was specific to why it is important to you when using a UPS. Basics about PFC can be found here:

http://www.dansdata.com/gz028.htm


Should you get a PFC PSU....in the US it is not mandatory like Europe but definately advisable when using a UPS.
 
Most "modified-sine" UPSes are actually happier driving a non-PFC supply than a PFC one. I won't go into the ugly details :D And "line interactive UPSes" don't necessarily put out true sine anyway.

In any case, there's no need to choose PFC over non-PFC. Just pick the power supply that fits your needs/budget ignoring that option.
 
gee said:
Most "modified-sine" UPSes are actually happier driving a non-PFC supply than a PFC one. I won't go into the ugly details :D And "line interactive UPSes" don't necessarily put out true sine anyway.
Click to expand...

Well yes with ferroresonant UPS units there can be an issue. I doubt the OP though has one though.
 
zyonuf79 said:
I read the following thread:

http://www.hardforum.com/showthread.php?p=1029405723#post1029405723

but I still do not really get the importance of PFC. I will be connecting my computer to a line interactive UPS which outputs a pure sine wave at all times. Do I need to go out of my way to get a PSU with Active PFC?
Click to expand...

A line interactive UPS does not output a pure sine wave at all times. An online (double conversion) would be what that is. Regardless, don't worry about getting a PSU with PFC.
 
If my memory serves me right...

What the power factor tells you is if your current is leading/lagging the voltage. With a purely resisive load, the current would follow the voltage perfectly. But introduce inductance or capacitance, and the graphs that kind of overlay each other stary shifting, kind of like California relative to the rest of the United States (slipping motion).

When this occurs, you end up drawing more power, but not utilize all of it. Therefore, PFC power supplies should be more efficient than non-PFC, which I think is why they made this mandatory over in Europe.

Someone correct me if I'm wrong here, but I believe that is the jist of it.
 
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