Electronics > Projects, Designs, and Technical Stuff
switching-PSUs: why can't you usually exceed the 50% of declared power?
wraper:
--- Quote from: Mechatrommer on May 25, 2020, 02:04:11 pm ---
--- Quote from: wraper on May 25, 2020, 01:51:28 pm ---Not true for most and particularly any decent power supply. 12V rail is often rated close to the total power rating.
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says who?
--- Quote from: wraper on May 25, 2020, 01:51:28 pm ---..Other rails have lower ratings but if you count power ratings of separate rails, usually you would come up with something like 700-750W for 600W PSU. Thus separate rail power ratings overlap within total power rating. But total output power of all rails of course should not exceed total power rating. If you see x+y+z = 600W for 600W PSU, that's a dead giveaway you are looking at piece of crap.
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and again, says who? most likely its just "your" definition of a "crap". its like saying whoever says 1+1+1=3 is a crap math, 1+1+1 should be 4 or 5.
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Says GOOGLE ATX PSU label. Find PSUs where rail power ratings added together equal to total power rating, then note on what kind PSUs you can see that. Based on that you don't need to be genius to guess that power rating is inflated.
0db:
--- Quote from: engrguy42 on May 25, 2020, 10:30:46 am ---So you bought 15 power supplies, ran them thru some tests including overloading them, performing tests on units you admit you don't understand, as well as the ATX specification which you don't understand (and apparently weren't aware of), and when they fail/blow up you return 11 of them?
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You love doing antagonism, don't you?
Sorry, I am not interested.
0db:
--- Quote from: tunk on May 25, 2020, 02:11:18 pm ---I also wondered about that, so I checked these two PSUs:
Cooler Master 400W (MPX-4001-ACABW-EU) where the specs adds up to 542W.
Corsair CV450 450W (CP-9020209-EU) where the specs adds up to 617W.
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Interesting. I haven't tested them yet, and these two are in the "cheap" range :D
Did you also test the ripple and the voltage range?
0db:
I have just bought a power meter, it's not professional, but I hope to measure the "Power Factor Correction" (PFC) somehow.
Learning alot new things :D
tunk:
I haven't tested them, I just looked up the specs and added it up.
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