Power Supply PFC, does it matter? - Techist - Tech Forum

Go Back   Techist - Tech Forum > Computer Hardware > New Systems | Building and Buying
Click Here to Login
Closed Thread
 
Thread Tools Display Modes
 
Old 07-11-2007, 01:18 AM   #1 (permalink)
Ultra Techie
 
Join Date: Dec 2004
Posts: 616
Send a message via AIM to OnlyCurious Send a message via Yahoo to OnlyCurious
Exclamation Power Supply PFC, does it matter?

The Xclio 550w has Efficiency: 85% with Active PFC. But the Xclio 500w doesn't have the active PFC. I read about it on the web, something to do with unecessary power being used or something. So does that mean the one without the PFC will use more watts or something?
__________________

__________________
Use my advice at your own risk.

My rig:
CoolerMaster Centurion 5
SamSung 20" LCD
Intel E6750 @ 2.66Ghz
Gigabyte p35-ds3r
Patriot Extreme 2gb 4-4-4-12
Sapphire X1950XT 256mb
Samsung 500gb @ 7200
PSU Xclio GreatPower 550W
Samsung DVD Burner
Logitec X-230 2.1
OnlyCurious is offline  
Old 07-11-2007, 02:47 AM   #2 (permalink)
Ultra Techie
 
Join Date: Dec 2004
Posts: 616
Send a message via AIM to OnlyCurious Send a message via Yahoo to OnlyCurious
Default Re: Power Supply PFC, does it matter?

hm... I guess nobody knows about this.
__________________

__________________
Use my advice at your own risk.

My rig:
CoolerMaster Centurion 5
SamSung 20" LCD
Intel E6750 @ 2.66Ghz
Gigabyte p35-ds3r
Patriot Extreme 2gb 4-4-4-12
Sapphire X1950XT 256mb
Samsung 500gb @ 7200
PSU Xclio GreatPower 550W
Samsung DVD Burner
Logitec X-230 2.1
OnlyCurious is offline  
Old 07-11-2007, 09:00 AM   #3 (permalink)
Mod Emeritus
 
b1gapl's Avatar
 
Join Date: Nov 2004
Location: USA
Posts: 13,044
Default Re: Power Supply PFC, does it matter?

PFC stands for Power Factor Correction, and it's a counteracting technique, used to control the load being drawn out, in order to create a power factor of 1. The closer to a power factor of 1, the better it is.

There are mainly two types. One is Active PFC, the other is passive. Active PFC is better, because it controls the amount of power being drawn out, to produce the correct power factor. Whereas Passive PFC, tries to correct the amount of power, being drawn out. It is not as effective as Active PFC....

I tried my best to explain it, but heres the source where I got my info.
__________________


3770K | ASUS STRIX GTX 1080 | DDR3-1600 16GB | CORSAIR 650D | CORSAIR HX 850W | CORSAIR H100 | SOUND BLASTER Z | ASROCK EXTREME4 GEN3

b1gapl is offline  
Old 07-11-2007, 09:15 AM   #4 (permalink)
Master Techie
 
baron5's Avatar
 
Join Date: Feb 2007
Location: Australia
Posts: 2,984
Default Re: Power Supply PFC, does it matter?

whoa thats kinda hard to understand might have too look at ur source over there
__________________
<<<Please give me Rep if I have helped you<<<

I7 930 @ 4GHz : Noctua D-14
Gigabyte X58A-UD7 : Asus GTX 480
G.Skill Trident 1600MHz 6-8-7-18 : Samsung F3 1TB
OCZ Vertex 2 50GB : Silverstone RV02 Case
Silverstone Strider Plus 1Kw : Sony DRU-870s Optical
Samsung P2350 Monito
r

baron5 is offline  
Old 07-11-2007, 03:04 PM   #5 (permalink)
Ultra Techie
 
Join Date: Dec 2004
Posts: 616
Send a message via AIM to OnlyCurious Send a message via Yahoo to OnlyCurious
Default Re: Power Supply PFC, does it matter?

would you guys recommend a PSU with pfc?
__________________
Use my advice at your own risk.

My rig:
CoolerMaster Centurion 5
SamSung 20" LCD
Intel E6750 @ 2.66Ghz
Gigabyte p35-ds3r
Patriot Extreme 2gb 4-4-4-12
Sapphire X1950XT 256mb
Samsung 500gb @ 7200
PSU Xclio GreatPower 550W
Samsung DVD Burner
Logitec X-230 2.1
OnlyCurious is offline  
Old 07-11-2007, 03:08 PM   #6 (permalink)
Renowned Budgeting Master
 
Join Date: Nov 2006
Location: Uniontown, PA
Posts: 4,153
Send a message via AIM to Sora
Default Re: Power Supply PFC, does it matter?

It's nice to have but honestly not really needed either. I don't have it in mine and that didn't stop me from getting my PSU.
__________________
E6300 w/ Arctic Freezer Pro 7 @ 3.6ghz 1.4Vcore
Antec 900 Case
EVGA 750i FTW Mobo
4x1GB of G.skill DDR2-800
2 8800GT in SLI
22" Samsung Syncmaster
1 250GB WD and 1 Seagate 7200.10 in RAID 0
Corsair 520HX 3DMark06 Score: 13900
Sora is offline  
Old 07-11-2007, 03:39 PM   #7 (permalink)
Ultra Techie
 
Join Date: Dec 2004
Posts: 616
Send a message via AIM to OnlyCurious Send a message via Yahoo to OnlyCurious
Default Re: Power Supply PFC, does it matter?

Sorry, I guess I don't understand how the PFC's work...
I actually read a couple of those articles on PFC's but I don't understand the ADVANTAGES of them over a PSU that doesn't have it. Could someone list the advantages of PFC's?
__________________
Use my advice at your own risk.

My rig:
CoolerMaster Centurion 5
SamSung 20" LCD
Intel E6750 @ 2.66Ghz
Gigabyte p35-ds3r
Patriot Extreme 2gb 4-4-4-12
Sapphire X1950XT 256mb
Samsung 500gb @ 7200
PSU Xclio GreatPower 550W
Samsung DVD Burner
Logitec X-230 2.1
OnlyCurious is offline  
Old 07-11-2007, 07:29 PM   #8 (permalink)
MetalHead Techie
 
Join Date: Jun 2007
Location: Minnesota
Posts: 2,912
Default Re: Power Supply PFC, does it matter?

I believe mine has it, i got it because it didnt cost that much more and ppl said it would help
i know for sure that better overall efficiancy is one adv
i also found these if you can understand it...i cant
Quote:
Originally Posted by powerelectronics.com/
Active power factor correction (PFC) techniques have evolved significantly over the past decade and a half in terms of knowledge base, component availability, design optimization and cost reduction. However, a large portion of the ATX power supplies required to meet the IEC 1000-3-2 requirements still use a passive PFC approach.

Despite the bulk and “clunkiness” of the passive inductor required, economic rationalizations are available for this choice. However, in the broader context of system optimization and end-customer preferences, these rationalizations may soon lose validity. End-user requirements for higher functionality and higher power levels are accompanied by the need for more compact solutions. In the active PFC realm, these demands are easier to satisfy than with the passive approaches.

A key issue to consider when choosing a harmonic reduction circuit is its impact on the rest of the system. We can quantify this effect by examining a 250-W ATX example. Fig. 2 shows the representative circuits for the active and passive approaches. The passive PFC solution requires a range switch and a voltage doubler to keep the bulk voltage relatively constant. The differences between the two approaches are quantified in Table 1.

One of the most significant benefits of the active PFC is realized in the design of the downstream SMPS converter. The minimum input voltage for the SMPS stage is increased (as shown in Table 1, 300 V versus 200 V for 250 W) for the same holdup time and for much smaller capacitor values.

With the narrower input voltage range, the SMPS design has a flexibility that can be exploited for lower system cost, better efficiency or both. For example, the rms current in the SMPS stage power MOSFET and the transformer is reduced by 33&#37; (from 2.05 A to 1.36 A) with the inclusion of PFC stage, which leads to a 56% reduction in conduction losses in these elements if the same RDS(on) and wire gauge are used. Alternatively, lower-cost MOSFETs may be used to achieve the same conduction loss.

Another area where the active PFC solution helps is in meeting the holdup time (or line dropout) requirements — usually one line cycle at full load and low line. The active PFC boost naturally provides great holdup performance without requiring a large capacitance value since the energy is stored in boost output capacitor at a much higher voltage (~ 400 V).

Any non-PFC or passive-PFC solution stores the energy at the peak of the line voltage, which is about 140 V for low line (100 V). With the voltage doubler, this voltage becomes twice that value. The impact of this is reflected in the size of the holdup capacitor shown in Table 1. Remember that the values shown in Table 1 are for different minimum voltages. If the same minimum voltage were used, the difference in capacitance value would be much more pronounced.
__________________
Proc Intel 2500k
Video XFX 6950 1Gb
Display 22'' Monitor Chemei 5ms RT, 800:1 CR
Mobo Biostar Z68A+
Mem 4 gb PNY DDR3 1600
Case afk
Sound Logitech z-5300e 5.1 + Razer Orca's + Creative Soundblaster Audigy SE
PSU Corsair 520hx
OS Windows 7 64-bit
Cooling Corsair H60 Liquid Cooling
HDD Hitachi 1Tb
Invisible is offline  
Old 07-11-2007, 08:57 PM   #9 (permalink)
Ultra Techie
 
Join Date: Dec 2004
Posts: 616
Send a message via AIM to OnlyCurious Send a message via Yahoo to OnlyCurious
Default Re: Power Supply PFC, does it matter?

I don't really know either... LOL. Sounds like there is a "lag" when voltage goes in and out of the circuits and PFC takes care of it??? LOL, just a guess.
__________________
Use my advice at your own risk.

My rig:
CoolerMaster Centurion 5
SamSung 20" LCD
Intel E6750 @ 2.66Ghz
Gigabyte p35-ds3r
Patriot Extreme 2gb 4-4-4-12
Sapphire X1950XT 256mb
Samsung 500gb @ 7200
PSU Xclio GreatPower 550W
Samsung DVD Burner
Logitec X-230 2.1
OnlyCurious is offline  
Old 07-11-2007, 08:59 PM   #10 (permalink)
gone
 
Join Date: Jan 2007
Posts: 2,051
Send a message via AIM to Gabb
Default Re: Power Supply PFC, does it matter?

PSUs with active PFCs arent that much more expensive, just dish out the 20 extra dollars. You never want to go cheap on the PSU
__________________

Gabb is offline  
Closed Thread

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
POST Troubleshooting Guide SYL\X/3K Hardware Repairs and Troubleshooting 7 03-07-2009 11:24 AM
Installed new power supply PC still not turning on helix2301 Hardware Repairs and Troubleshooting 6 06-30-2007 01:43 PM
Power Supply Brinson Overclocking and Modding 4 06-13-2007 09:12 AM
7 VSB from power supply?? GregJ Hardware Repairs and Troubleshooting 1 05-14-2007 11:36 AM
Can I use ATX Power supply without -5 volt out jar99 Monitors, Printers and Peripherals 2 05-12-2007 02:28 AM



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 08:16 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.