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2007 Energy Independence and Security Act – EISA The Energy Independence and Security Act of 2007 was passed in December of 2007 and addresses minimum efficiency standards and standby levels for Class A external power supplies that are 250 watts and under. This law stipulates that external power supplies manufactured on July 1, 2008 and beyond meet certain minimum efficiency and standby criteria as defined below. Minimum Efficiency Criteria
Active mode is defined as when a power supply’s input is connected to line voltage AC and its output is connected to a DC or AC load drawing a portion of the product’s power output. Depending on the power rating for the power supply, it must meet the minimum efficiency criteria outlined below. Energy-Efficiency Criteria for Active Mode:| output power on adapter label | | minimum average efficiency percentage | | 0 to ≤ less than 1 watt | | ≥ 0.50 * output power on adapter label | | > 1 to ≤ 51 watts | | ≥ [0.09 * Ln (output power on adapter label )] + 0.50 | | > 51 watts | | ≥ 0.85 |
The power supply must also meet a requirement for when its input is connected to a line voltage AC but its output is not connected to a load. Depending on the power output of the supply, it must keep its energy consumption below the following values.
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