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Regulations:

Energy Star Definitions

1) Definitions: EPA has prepared detailed definitions of single voltage external ac-ac and ac-dc power supplies and other related terms as relevant to ENERGY STAR.

A. External Power Supply (EPS): For the purposes of this specification, an external power supply:
a) is designed to convert line voltage ac input into lower voltage ac or dc output;
b) is able to convert to only one output voltage at a time;
c) is sold with, or intended to be used with, a separate end-use product that constitutes the primary load;
d) is contained in a separate physical enclosure1 from the end-use product;
e) is connected to the end-use product via a removable or hard-wired male/female electrical connection, cable, cord or other wiring;
f) does not have batteries or battery packs that physically attach directly (including those that are removable) to the power supply unit;
g) does not have a battery chemistry or type selector switch AND an indicator light or state of charge meter (e.g., a product with a type selector switch AND a state of charge meter is excluded from this specification; a product with only an indicator light is still covered by this specification); and
h) has nameplate output power less than or equal to 250 watts.
B. Ac-Ac External Power Supply: An external ac-ac power supply is an EPS designed to convert line voltage ac input into lower voltage ac output.
C. Ac-Dc External Power Supply: An external ac-dc power supply is an EPS designed to convert line voltage ac input into lower voltage dc output.
D. Low Voltage External Power Supply: For the purposes of this specification, a low voltage model is an EPS with a nameplate output voltage of less than 6 volts and a nameplate output current greater than or equal to 550 milliamps.
F. Active Mode: The condition in which the input of a power supply is connected to line voltage ac and the output is connected to an ac or a dc load drawing a fraction of the power supply’s nameplate power output greater than zero.
G. No-Load Mode: The condition in which the input of a power supply is connected to an ac source consistent with the power supply’s nameplate ac voltage, but the output is not connected to a product or any other load.
H. Power Factor (True): The true power factor is the ratio of the active, or real, power (P) consumed in watts to the apparent power (S), drawn in volt-amperes (VA.

PF= P/S

This definition of power factor includes the effect of both distortion and displacement.

Energy Star EPS Version 1.1 (Effective January 1, 2005)

Energy_Star

Mark

Description

Performance Requirements

Nameplate Power Output (Pno)

No-Load Power

Nameplate Power Output (Pno)

Average Active Efficiency

III

Energy Star Tier 1 standard January 1, 2005 (voluntary)

0 to < 10W

10 to 250W

≤0.5W

≤0.75W

0 to 1W

> 1 to 49W

> 49 to 250W

≥0.49 x Pno

≥0.09 x Ln(Pno) + 0.49

≥0.84

Where Pno is the Nameplate Output Power of the unit under test. Ln refers to the natural logarithm.

Energy Star EPS Version 2.0 (Effective November 1, 2008)

*(April 1, 2009 for Imaging Equipment qualified under Version 1.1 Tier 2)

**(July 1, 2009 for Computers qualified under Version 5.0 specifications)

Computers qualified under the Version 5.0 specifications (effective July 2009) and Imaging Equipment qualified under the Version 1.1 Tier 2 specifications (effective April 2009) will need to meet the EPS Version 2.0 requirements, regardless of the EPS’s date of manufacture. Hence, qualifying models with an EPS must include an EPS that meets the EPS Version 2.0 requirements, even if the EPS manufacture date is prior to July 2009 or April 2009, respectively.

A. Active Mode

Energy-Efficiency Criteria for Ac-Ac and Ac-Dc External Power Supplies in Active Mode: Standard Models

Table 1: Energy-Efficiency Criteria for Active Mode

Nameplate Power Output (Pno)

Minimum Average Efficiency in Active Mode (expressed as a decimal)

0 to ≤ 1 watt

> 1 to ≤ 49 watts

> 49 watts

≥ 0.49 ° Pno + 0.067

≥ [0.0750 * Ln (Pno)] + 0.561

“Pno” is the Nameplate Output Power of the unit under test. “Ln” refers to the natural logarithm. The algebraic order of operations requires that the natural logarithm calculation be performed first and then multiplied by 0.0750, with the resulting output added to 0.561. (b) An efficiency of 0.87 or 0.86 in decimal form corresponds to the more familiar value of 87% or 86% when expressed as a percentage.

B. Power Factor Correction

In addition to the Active Mode efficiency requirements, power supplies with greater than or equal to 100 watts input power must have a true power factor of 0.9 or greater at 100% of rated load when tested at 115 volts @ 60Hz.

C. No-Load Mode

The third element of the ENERGY STAR specification is the No-Load power requirement, which specifies the maximum ac power that may be used by a qualifying ac-ac external power supply or ac-dc external power supply in the No-Load condition. Maximum power consumption levels for No-Load Mode are below provided.

Energy Consumption Criteria for No-Load

Nameplate Power Output (Pno)

Maximum Power in No-Load

AC-AC EPS

AC-DC EPS

0 to < 50 watts

≥ 50 to ≤ 250 watts

≤ 0.5 watts

≤ 0.5 watts

≤ 0.3 watts

≤ 0.5 watts


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