It is currently Mon Dec 10, 2018 7:25 pm

All times are UTC - 8 hours

Post new topic Reply to topic  [ 1 post ] 
Author Message
 Post subject: External power bricks and efficiency standards
PostPosted: Tue Jul 24, 2012 9:47 am 

Joined: Thu Oct 06, 2005 4:36 am
Posts: 7155
Location: Monterey Bay, CA
A couple of recent posts on people looking for power bricks caused me to wander the web looking for the appropriate efficiency standards in the US. From what I could glean:

Energy Star 5.2 for computers is the current version (effective July 2009). Energy Star 6 specs are under review, but, there aren't any improvements to the internal PSU or external power supply efficiencies. As an aside, the current internal PSU specs are equivalent to 80+ bronze.

The version 2.0 external power supply spec can be found here and has been in place since Nov 2008.

Here's the formula for external AC-AC and AC-DC bricks, if you don't want to wander the pdf.

Output power Efficiency
1W or less (0.48 * Power out) + 0.14
>1W to 49W (0.0626 * Ln(Power out)) + 0.622 or better
>49W 87% or better

1W -> 62%
10W -> 76.6%
20W -> 81%
30W -> 83.5%
40W -> 85.3%
49W+ 87%

I've also seen a reference to the California Energy Code Level 5 and 87% efficiency at load...but don't have the heart/patience to find/slog thru the documents.

So, that's the baseline for finding a brick that doesn't have crappy effiiciency. Seems like the fortron, etc bricks are already at 87-90%.

In the EU, there is Commision Regulation 278/2009 that was implemented in April 2011 to meet the same Level V spec.

I did come across this little tutorial on wall plug adapters from CUI on Digi-Key's website.

1080p Gaming build: i5-4670K, Mugen 4, Asrock Z97 Anniversary, MSI GTX 760 2GB Gaming, 8GB 1866 RAM, Samsung 860 Evo 500GB, Crucial MX100 256GB, WD Red 2TB, Samsung DVD burner, Fractal Define R4, Antec True Quiet 140 (2 front + rear) case fans, Seasonic SSR-550FX. 35W idle, 45-55W video streaming, 170-200W WoW, 318W stress test (Prime95 + Furmark)

Support SPCR through these links: Amazon and Newegg

Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 1 post ] 

All times are UTC - 8 hours

Who is online

Users browsing this forum: No registered users and 6 guests

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group