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PSU's Power Factor?
- Thread starter attack
- Start date
Here I go off on something that I'm not completely sure about...If I'm completely wrong, for the love of all that's sacred, please correct me.
From what i get here
http://members.tripod.com/~masterslic/FAQ-2/22.html
and my other thread here
http://forum.oc-forums.com/vb/showthread.php?threadid=251061
it seems to me that you would be incredibly lucky to have a power factor of unity. I believe that the efficiency rating found on newegg for many of their power supplies would be ok to use. With a semi-randomly chosen 350W Fortron power supply, we see
http://www.newegg.com/app/ViewProdu...-104-966&catalog=58&manufactory=BROWSE&depa=1
that the efficiency is a minimum of 65%, typically 70% under full load (which is probably what most people here are at. If you're not... fold for team 32!
) I want to just convert this to a power factor of 0.65-0.7, but that's probably not right.
The primary reason for my stating that the power supplies are not a power factor of unity is the fact that there are power factor correction power supplies. If there was nothing to correct, such things would probably not exist.
I would be interested to see some readings off of some of the forum member's rigs using a wattmeter, ammeter/voltmeter and the math in the first link. I'll try to take some measurements this weekend.
Another link on comparison of power supply efficiency:
http://www6.tomshardware.com/howto/20030609/power_supplies-02.html
What bothers me is the fact that the 450W Fortron with active PFC has the same efficiency as the non-PFC 350W psu. Is this just because power supplies lose efficiency as they become larger?
yes, i like giving links
From what i get here
http://members.tripod.com/~masterslic/FAQ-2/22.html
and my other thread here
http://forum.oc-forums.com/vb/showthread.php?threadid=251061
it seems to me that you would be incredibly lucky to have a power factor of unity. I believe that the efficiency rating found on newegg for many of their power supplies would be ok to use. With a semi-randomly chosen 350W Fortron power supply, we see
http://www.newegg.com/app/ViewProdu...-104-966&catalog=58&manufactory=BROWSE&depa=1
that the efficiency is a minimum of 65%, typically 70% under full load (which is probably what most people here are at. If you're not... fold for team 32!
) I want to just convert this to a power factor of 0.65-0.7, but that's probably not right.The primary reason for my stating that the power supplies are not a power factor of unity is the fact that there are power factor correction power supplies. If there was nothing to correct, such things would probably not exist.
I would be interested to see some readings off of some of the forum member's rigs using a wattmeter, ammeter/voltmeter and the math in the first link. I'll try to take some measurements this weekend.
Another link on comparison of power supply efficiency:
http://www6.tomshardware.com/howto/20030609/power_supplies-02.html
What bothers me is the fact that the 450W Fortron with active PFC has the same efficiency as the non-PFC 350W psu. Is this just because power supplies lose efficiency as they become larger?
yes, i like giving links
