Mailinglist Archive: opensuse (3031 mails)

[Tom Patton <thpnalb@xxxxxxxxxxxxx>]

On Thu, 2008-02-07 at 10:13 +0100, Per Jessen wrote:
> Randall R Schulz wrote:
>
> > Offhand, I don't know how the efficiency of today's power supplies
> > varies with the percentage of their rated output they're producing. In
> > other words, does a higher-capacity PSU consume more mains power for a
> > given level of consumption on its output side? If so, you wouldn't
> > want to have such a large PSU, since that would be wasteful.
>
> I haven't looked at switchmode technology for quite some time, but I
> would expect a fairly fixed efficiency in the 80-90% range, quite
> probably more.  There will be a minimum consumption required in order
> to achieve optimal operation, but otherwise I think the output power
> will be e.g. 80% of the input power, and the rest is turned into heat. 
or to say it another way...(at 80% efficiency) a 150 watt supply or a
500 watt supply should either one pull the same current from the mains,
if they alternately supply the same 80 watt load (ie MB)...approximately
100 watts from the mains in each example.  It would NOT be wasteful to
the environment...(but maybe to your wallet).

Tom in NM


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