EFFICIENCY STANDARDS

for external power supplies


Efficiency Standards
Efficiency standards icon

Focusing on Efficiency

The global regulatory environment surrounding the legislation of external power supply efficiency and no-load power draw has rapidly evolved over the past decade since the California Energy Commission (CEC) implemented the first mandatory standard in 2004. With the publication of a new set of requirements by the United States Department of Energy (DOE) that took effect on February 10, 2016, the landscape has changed again as regulators try to further reduce the amount of energy consumed by external power adapters. To help our customers stay on top of these continuously evolving global regulations, we have set out to push the energy efficiency initiative across our entire power portfolio. By continually monitoring the latest energy efficiency regulations, we ensure that not only our products, but our customers’ products are in compliance in each region where they are sold.

Level VI Products

Level VI Products

Browse CUI's portfolio of Level VI external ac-dc power supplies.
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Highlights

  • Level VI efficiency
  • No load power consumption < 0.075 W
  • Universal input voltage range
  • Full suite of safety approvals
  • Custom versions available

A Brief History

The infograph below traces the path from the CEC’s 2004 regulation up to the new Level VI standards that took effect in February 2016.


Efficiency Timeline

The above timeline demonstrates just how dynamic the regulatory environment has been over the past several years. As different countries and regions enact stricter requirements and move from voluntary to mandatory programs, it has become vital that OEMs continually track the most recent developments to ensure compliance and avoid costly delays or fines. While many countries are establishing voluntary programs harmonized to the international efficiency marking protocol system first established by Energy Star, the following countries and regions now have regulations in place mandating that all external power supplies shipped across their borders meet the specified efficiency level:


LEVEL COUNTRY
VI United States
IV Canada
V European Union

The international efficiency marking protocol defines two performance criteria; no-load power consumption and energy efficiency. The table below summarizes the performance thresholds for each efficiency level as they were established over time:


LEVEL NO-LOAD POWER REQUIREMENT AVERAGE EFFICIENCY REQUIREMENT
I used if you do not meet any of the criteria
II no criteria was ever established
III ≤10 Watts: ≤0.5W of No Load Power
10~250 Watts: ≤0.75W No Load Power
≤1 Watt: ≥ Power x 0.49
1~51 Watts: ≥[0.09 x Ln(Power)] + 0.49
49~250 Watts: ≥84%
IV 0~250 Watts: ≤0.5W No Load Power ≤1 Watt: ≥ Power x 0.50
1~51 Watts: ≥[0.09 x Ln(Power)] + 0.5
51~250 Watts: ≥85%
V Standard Voltage Ac-Dc Models (>6Vout)
0~49 Watts: ≤0.3W No Load Power
50~250 Watts: ≤0.5W No Load Power
≤1 Watt: ≥ 0.48 x Power + 0.140
1~49 Watts: ≥[0.0626 x Ln(Power)] + 0.622
50~250 Watts: ≥87%
Low Voltage Ac-Dc Models (<6Vout)
0~49 Watts: ≤0.3W No Load Power
50~250 Watts: ≤0.5W No Load Power
≤1 Watt: ≥ 0.497 x Power + 0.067
1~49 Watts: ≥[0.0750 x Ln(Power)] + 0.561
50~250 Watts: ≥86%
The term "power" means the power designated on the label of the power supply.

Complying with Level VI

In addition to tightened regulations for existing adapters, Level VI expands the range of products that fall under the standard. Regulated products now include:

  • Multiple-voltage external power supplies
  • Products with power levels > 250 watts

The new performance thresholds are summarized in the table below:

Single-Voltage External Ac-Dc Power Supply, Basic-Voltage
Nameplate Output Power (Pout) Minimum Average Efficiency in Active Mode
(expressed as a decimal)
Maximum Power in No-Load Mode [W]
Pout ≤ 1 W ≥ 0.5 x Pout + 0.16 ≤ 0.100
1 W < Pout ≤ 49 W ≥ 0.071 x ln(Pout) - 0.0014 x Pout + 0.67 ≤ 0.100
49 W < Pout ≤ 250 W ≥ 0.880 ≤ 0.210
Pout > 250 W ≥ 0.875 ≤ 0.500

Single-Voltage External Ac-Dc Power Supply, Low-Voltage
Nameplate Output Power (Pout) Minimum Average Efficiency in Active Mode
(expressed as a decimal)
Maximum Power in No-Load Mode [W]
Pout ≤ 1 W ≥ 0.517 x Pout + 0.087 ≤ 0.100
1 W < Pout ≤ 49 W ≥ 0.0834 x ln(Pout) - 0.0014 x Pout + 0.609 ≤ 0.100
49 W < Pout ≤ 250 W ≥ 0.870 ≤ 0.210
Pout > 250 W ≥ 0.875 ≤ 0.500

Single-Voltage External Ac-Ac Power Supply, Basic-Voltage
Nameplate Output Power (Pout) Minimum Average Efficiency in Active Mode
(expressed as a decimal)
Maximum Power in No-Load Mode [W]
Pout ≤ 1 W ≥ 0.5 x Pout + 0.16 ≤ 0.210
1 W < Pout ≤ 49 W ≥ 0.071 x ln(Pout) - 0.0014 x Pout + 0.67 ≤ 0.210
49 W < Pout ≤ 250 W ≥ 0.880 ≤ 0.210
Pout > 250 W ≥ 0.875 ≤ 0.500

Single-Voltage External Ac-Ac Power Supply, Low-Voltage
Nameplate Output Power (Pout) Minimum Average Efficiency in Active Mode
(expressed as a decimal)
Maximum Power in No-Load Mode [W]
Pout ≤ 1 W ≥ 0.517 x Pout + 0.087 ≤ 0.210
1 W < Pout ≤ 49 W ≥ 0.0834 x ln(Pout) - 0.0014 x Pout + 0.609 ≤ 0.210
49 W < Pout ≤ 250 W ≥ 0.870 ≤ 0.210
Pout > 250 W ≥ 0.875 ≤ 0.500

Multiple-Voltage External Power Supply
Nameplate Output Power (Pout) Minimum Average Efficiency in Active Mode
(expressed as a decimal)
Maximum Power in No-Load Mode [W]
Pout ≤ 1 W ≥ 0.497 x Pout + 0.067 ≤ 0.300
1 W < Pout ≤ 49 W ≥ 0.075 x ln(Pout) + 0.561 ≤ 0.300
Pout > 49 W ≥ 0.860 ≤ 0.300

Exemptions


The Level VI mandate defines exemptions for EPS products. The direct operation EPS standards do not apply if:

It is a device that requires Federal Food and Drug Administration listing and approval as a medical device in accordance with section 360c of title 21;
OR
A direct operation, ac-dc external power supply with nameplate output voltage less than 3 volts and nameplate output current greater than or equal to 1,000 milliamps that charges the battery of a product that is fully or primarily motor-operated.

External Ac-Dc Power Supplies

CUI is committed to implementing the latest energy saving technologies into our external power supplies to address increasing market demands and to comply with all current and future regulations. Beginning in late 2014, CUI began introducing a comprehensive Level VI compliant adapter portfolio to keep our customers one step ahead of the rapidly evolving power landscape.

pdf icon Read the Efficiency Standards for External Power Supplies Application Note.


Wall Plug-in Style

Wall Plug-In Style

Compact, efficient wall plug ac-dc power supplies ranging from 5 W to 36 W with features that include interchangeable AC input blades for maximum flexibility.

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Multi-Blade Style

Multi-Blade Style

Designed to provide a global solution in one package, interchangeable AC blades for North America, Europe, Australia, and the UK.

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Desktop Style

Desktop Style

ITE and medical desktop ac-dc power supplies from 12 W to 250 W with a range of worldwide safety approvals.

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