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11-Feb-13
RDR-91 12 V, 1 A, Universal Input Supply
9.2 Active Mode CEC Measurement Data
In the state of California, after July 1, 2006, all single-output EPS adapters – including
those sold with the products they power – must meet the California Energy Commission
(CEC) requirement for minimum active-mode efficiency and no-load input power
consumption. Minimum active-mode efficiency is defined as the average efficiency at 25,
50, 75 and 100% of rated output power printed on the nameplate of the supply:
Nameplate Output (P O )
<1W
? 1 W to ? 49 W
> 49 W
Minimum Efficiency in Active Mode of Operation
0.49 ? P O
0.09 ? ln (P O ) + 0.49 [ln = natural log]
0.84 W
For adapters that are single input voltage only, the measurements are to be made at the
nominal rated input voltage (115 VAC or 230 VAC). For universal input adapters, the
measurements are to be made at both nominal input voltages (115 VAC and 230 VAC).
To comply with the standard, the average of the four efficiency measurements must be
greater than or equal to the efficiency specified by the standard.
Percent of Full
Efficiency (%)
Load
25
50
75
100
Average
Required CEC
115 VAC
75
78.5
78.8
78
77.6
230 VAC
74.5
78.8
78.5
79.1
77.7
minimum
average
71.3
efficiency (%)
From these results it is apparent that the efficiency of this design easily exceeds the
required 71.3 %. More states within the USA, and many other countries around the world
are adopting similar energy efficiency standards (based on the original Energy Star
standard). For the latest, up-to-date information on energy efficiency regulations, please
visit the PI Green Room, at:
http://www.powerint.com/greenroom/regulations.htm
Power Integrations
Page 17 of 35
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www.powerint.com
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