Here’s an update on some recent activity in energy efficiency programs for external power supplies (EPSs) and a chart summarizing the specs.
Last month, the European Commission’s Ecodesign Directive tightened its Lot 7 EPS standard from the initial Tier 1 efficiency levels to Tier 2. Notable changes include the reduction of no-load power consumption for EPSs < 50 W, from 0.5 W to 0.3 W, with active mode requirements tightening up for all power level ranges.
Speaking of no-load, the newly revised Chinese Mobile Phone Standard (YD/T 1591-2009) has also toughened up its no-load requirement for USB power level EPSs to ≤ 0.15 W.
And finally, the U.S. Department of Energy (DoE) is on the verge of releasing its proposed final draft of the expansion of its EPS efficiency standard (part of EISA 2007). I wrote about its early development in a previous blog (see: When One Door Closes, Another One Opens). When finalized and published, the DoE’s mandatory standard will be the first to cover multi-output and higher power (> 250 W) EPSs. It’s also expected that the current EISA2007 EPS efficiency levels for single output power supplies <250 W will harmonize with the Ecodesign Tier 2.
The following table summarizes the requirements of the Chinese Mobile Phone, the EC Ecodesign, and the proposed EISA 2007 standards.
| EC Ecodesign Version 2 (2011)China (YD/T 1591-20091) | EISA 2007 (DoE) | ||
|---|---|---|---|
| Standard Voltage PS2 | Low Voltage PS2 | ||
| Nameplate OutputPower (Pno) | Minimum Average Efficiency, Active Mode |
Minimum Average Efficiency, Active Mode |
Minimum Average Efficiency, Active Mode |
| ≤ 1 watt | ≥ 0.480 * Pno + 0.140 | ≥ 0.497 * Pno + 0.067 | 0.5* Pno |
| > 1 to ≤ 49 watts | ≥ [0.0626 * Ln (Pno)] + 0.622 | ≥ [0.0750 * Ln (Pno)] + 0.561 |
|
| > 1 to ≤ 51 watts | ≥ [0.0626 * Ln (Pno)] + 0.622(Ecodesign only) | ≥ [0.09 * Ln (Pno)] + 0.5 | |
| > 49 watts | ≥ 0.870 | ≥ 0.860 | |
| > 51 watts | ≥ 0.870(Ecodesign only) | ≥ 0.850 | |
| No-Load Power3,4,5 | No-Load Power4,5 | No-Load Power | |
| < 50 watts | 0.3 watts / 0.15 watts | 0.3 watts / 0.15 watts | 0.5 watts |
| ≥ 50 to ≤ 250 watts | 0.5 watts | 0.5 watts | 0.5 watts |
Notes:
1. YD/T standard covers only EPS with USB output of 5 V, 500 mA to 1500 MA
2. Standard voltage power supply excludes low-voltage power supplies which are defined as < 6 volts and ≥ 550 mA
3. AC-AC is ≤ 0.5 W for all power levels
4. The YD/T no-load spec for mobile handheld battery-powered apps = < 0.15 W
5. For Ecodesign, power levels are ≤ 51 watts and > 51 watts
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