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 |  | | | | A.
Active Mode
To be eligible for ENERGY STAR qualification, an external power supply model must meet or exceed a minimum average efficiency for Active Mode, which varies based on the model’s nameplate output power. Tables 1 and 2, below, outline the equations for determining minimum average efficiency, where Pno stands for nameplate output power and Ln refers to the natural logarithm. Table 1 addresses all standard EPSs, while Table 2 gives separate equations for a subset of low voltage EPSs that meet the appropriate definition in Section 1.D. All efficiency values shall be expressed in decimal form and rounded to the hundredths place.
Table 1: Energy-Efficiency Criteria for Ac-Ac and Ac-Dc External Power Supplies in Active Mode: Standard Models
Nameplate Output Power (Pno)
Minimum Average Efficiency in Active Mode (expressed as a decimal) 2
0 to ≤ 1 watt
≥ 0.480 * Pno + 0.140
> 1 to ≤ 49 watts
≥ [0.0626 * Ln (Pno)] + 0.622
> 49 watts
≥ 0.870
Table 2: Energy-Efficiency Criteria for Ac-Ac and Ac-Dc External Power Supplies in Active Mode: Low Voltage Models
Nameplate Output Power (Pno)
Minimum Average Efficiency in Active Mode (expressed as a decimal) 2
0 to ≤ 1 watt
≥ 0.497 * Pno + 0.067
> 1 to ≤ 49 watts
≥ [0.0750 * Ln (Pno)] + 0.561
> 49 watts
≥ 0.860 |
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