ENERGY STAR EPS Version 2.0 Specification
Version 2.0 of ENERGY STAR’s External Power Supply efficiency specification has been finalized and will take effect on November 1, 2008. Notable changes in the version 2.0 of the specification include:
- Increased active mode energy efficiency minimum requirements
- Reduced no-load power max limits
- Power factor correction requirement added for power supplies with an input power ≥ 100 watts
- Separate no-load requirements for AC-DC and AC-AC
The test methodology is unchanged, and compliance is voluntary The following tables show active mode energy efficiency and no-load power consumption specifications in the final draft.
EPS Active Mode Efficiency: Standard Models
| Nameplate Output Power (Pno) | Minimum Average Efficiency in Active Mode (expressed as a decimal, rounded to hundreths) |
|---|---|
| 0 to ≤ 1 watt | ≥ 0.480 * Pno+ 0.140 |
| > 1 watt to ≤ 49 watts | ≥ [0.0626 * Ln (Pno)] + 0.622 |
| > 49 watts | ≥ 0.870 |
EPS Active Mode Efficiency: Low Voltage* Models
| Nameplate Output Power (Pno) | Minimum Average Efficiency in Active Mode (expressed as a decimal, rounded to hundreths) |
|---|---|
| 0 to ≤ 1 watt | ≥ 0.497 * Pno+ 0.067 |
| > 1 watt to ≤ 49 watts | ≥ [0.0750 * Ln (Pno)] + 0.561 |
| > 49 watts | ≥ 0.860 |
* 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
No-load Energy Consumption
| Nameplate Output Power (Pno) | Maximum Power for No-load | ||
|---|---|---|---|
| AC-AC EPS | AC-DC EPS | ||
| 0 to < 50 watts | ≤ 0.5 watts | ≤ 0.3 watts | |
| ≥ 50 to ≤ 250 watts | ≤ 0.5 watts | ≤ 0.5 watts | |
Conforming Design Ideas from Power Integrations
The following table shows Power Integrations Design Ideas that meet the spec.
| Document | Device Used | Power Output (W) | Efficiency (4 Points Average) * | CEC 2008 † | ENERGY STAR 2.0 ‡ |
|---|---|---|---|---|---|
| DI-113 | TNY274PN | 5 | 71.5% | 59.9% | 68% |
| DI-115 | TNY376PN | 7.5 / 13 Pk | 77.7% | 68.1% | 75% |
| DI-143 | TOP258MN | 20 / 80 Pk | 85% | 77% | 81% |
| DI-144 | TOP258PN | 50 / 70 Pk | 89.9% | 84% | 87% |
* The actual measurement of the average efficiency of the design idea at the 4 test points of load: 25%, 50%, 75% and 100%, as called for by CEC and ENERGY STAR specs
† The California Energy Commission standard that will become effective in July, 2008
‡ Minimum average efficiency called for by EPS V. 2.0 spec
