Energy Independence and Security Act of 2007 (EISA)
Phihong Power Supplies that are Compliant
Scope
Class A External Power Supply – A devices that is (I) designed to convert line voltage AC input into a lower voltage AC or DC output; (II) is able to convert to only 1
AC or DC voltage at a time; (III) is sold with, or intended to be used with a separate end-use product that constitutes the primary load; (IV) is contained in a separate physical enclosure from the
end-use product; (V) is connected to the end-use product via a removable or hard-wired male/female electrical connection, cable, cord, or other wiring; and (VI) has nameplate output power that is less
than or equal to 250 watts.
Limits
A class A external power supply manufactured on or after the later of July 1, 2008, or that
date of enactment of this paragraph, shall meet the following standards:
Standards for Class A External Power Supplies
Effective July 1, 2008
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Nameplate Output
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Minimum Efficiency in Active Mode
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<1 Watt
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0.5 * Nameplate Output
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Greater than or = to 1 and Less than or = to 51 Watts
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0.09 * Ln(Nameplate Output) + 0.5
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> 51 Watts
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0.85
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Maximum Energy Consumption in No-Load Mode
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Any output
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0.5 Watts
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Where Ln (Nameplate Output) = Natural Logarithm of the nameplate output expressed in Watts.
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Marking Requirements
The nameplate of class A external power supplies shall be clearly and permanently marked (e.g., imprint,
label, etc.) with the appropriate Roman numeral (I – VI) that corresponds to specific minimum Active and
No-Load efficiency levels. The appropriate Roman numeral shall be determined by: 1) comparing the
unit’s Active and No-Load test data with the performance requirements at each level of the Roman numeral scale; and 2) choosing the highest Roman numeral where the power supply meets the Active
and No-Load requirements.
The mark shall comply with the following:
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