All power supplies, as required by Intel specs and other
standards, must already have such line conditioning. However,
many power supply manufacturers have discovered higher profits
by dumping supplies into North America missing many essential
functions. The naive computer assembler buys only on price.
Therefore selling inferior supplies are quite profitable. You
will even find them sold in CompUSA.
Any supply that does not include a long list of
specifications is typically in that defective list. Some
specs that all supplies must meet:
Specification compliance: ATX 2.03 & ATX12V v1.1
Acoustics noise 25.8dBA typical at 70w, 30cm
Short circuit protection on all outputs
Over voltage protection
Over power protection
100% hi-pot test
100% burn in, high temperature cycled on/off
PFC harmonics compliance: EN61000-3-2 + A1 + A2
EMI/RFI compliance: CE, CISPR22 & FCC part 15 class B
Safety compliance: VDE, TUV, D, N, S, Fi, UL, C-UL & CB
Hold up time, full load: 16ms. typical
Efficiency; 100-120VAC and full range: >65%
Dielectric withstand, input to frame/ground: 1800VAC, 1sec.
Dielectric withstand, input to output: 1800VAC, 1sec.
Ripple/noise: 1%
MTBF, full load @ 25°C amb.: >100k hrs
That will eliminate so many power supplies from your
acceptable list. However you will discover that to provide
such functions, the power supply typically costs on the order
of $80. If the supply is selling for $40, then you know why
those specifications cannot be located.
Furthermore so many supplies that don't provide specs also
don't provide the wattage they claim. Therefore you see so
many people recommending 400+ watt supplies because their
experience was th 300 watt supply was too small. In reality,
the 300 watt supply was not providing 300 watts. But they did
not seek specifications first. Instead they only bought on
price - and got the supply they paid for.
Start the search with a demand for specifications. Make
sure the above list is also 'claimed' by that supply.
