Input Characteristics of PSUs?

[Schuttwegraeumer]

All of the modern PSU have a PFC, mostly a active one.
But how good are the PFCs in the PSUs really?
I dont have the equipment to check this but THW should have such equipment.

How good are the built in PFC in the PSU really?
Does a good PF mean that the cosinus phi is near 1 or is the reactive power not a problem in private homes?

 

[dirtmountain]

http://www.jonnyguru.com/modules.php?name=NDLinks
http://www.hardwaresecrets.com/article/181

2 good links

 

[Schuttwegraeumer]

Thank you, very interesting links.

But no comparison between modern PSU.
Are all of the as good as a Ohm Resistor?
In the EU all PSU from 75W up must have a PFC but whats with smaller PSU?
Of typicall cellphone charger or other small PSUs in the pile of elektric stuff?

Are there tests of PSUs to compare the power factor or graphics of the "sinus" shape of the current?