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Federal Register / Vol. 86, No. 209 / Tuesday, November 2, 2021 / Proposed Rules loading conditions for single-voltage external power supplies with multiple output busses.
For additional explanation provided for guidance only, please refer to section 6.1.1
of the California Energy Commissions Generalized Test Protocol for Calculating the Energy Efficiency of Internal Ac-Dc Power Supplies Revision 6.7, March 2014.
A Consider a power supply with N output busses, each with the same nameplate output voltages V1, , VN, corresponding output current ratings I1, , IN, and a nameplate output power P. Calculate the derating factor D by dividing the power supply maximum output power P by the sum of the maximum output powers of the individual output busses, equal to the product of port nameplate output voltage and current IiVi, as follows:

B If D 1, then loading every port to its nameplate output current does not exceed the overall maximum output power for the power supply. In this case, load each output bus to the percentages of its nameplate output current listed in Table 1 of this section. However, if D <1, it is an indication that loading each port to its nameplate output current will exceed the overall maximum output power for the power supply. In this case, and at each loading condition, load each output bus to the appropriate percentage of its nameplate output current as listed in Table 1, multiplied by the derating factor D.
v Test switch-selectable single-voltage external power supplies twiceonce at the highest nameplate output voltage and once at the lowest.
vi Efficiency calculation. Calculate and record efficiency at each loading point by dividing the UUTs measured active output
power at a given loading condition by the active AC input power measured at that loading condition.
A Calculate and record average efficiency of the UUT as the arithmetic mean of the efficiency values calculated at Loading Conditions 1, 2, 3, and 4 in Table 1 of this section.
B If, when tested, a UUT cannot sustain output current at one or more of the loading conditions as specified in Table 1, the average active-mode efficiency is calculated as the average of the loading conditions for which it can sustain output.
C If the UUT can only sustain one output current at any of the output busses, test it at the loading condition that allows for the maximum output power on that bus i.e., the highest output current possible at the highest output voltage on that bus.
vii Power consumption calculation. The power consumption of Loading Condition 5
no-load is equal to the active AC input power W at that loading condition.
viii Off-Mode Measurement. If the UUT
incorporates manual on-off switches, place the UUT in off-mode, and measure and record its power consumption at Loading Condition 5 in Table 1 of this section. The measurement of the off-mode energy consumption must conform to the requirements specified in section 5a1 of this appendix, except that all manual on-off switches must be placed in the off position for the off-mode measurement. The UUT is considered stable if, over 5 minutes with samples taken at least once every second, the AC input power does not drift from the maximum value observed by more than 1%
or 50 milliwatts, whichever is greater.
Measure the off-mode power consumption of a switch-selectable single-voltage external power supply twiceonce at the highest nameplate output voltage and once at the lowest.

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b Multiple-Voltage External Power Supply.
1 Standby-Mode and Active-Mode Measurement.
i Place in the on position any built-in switch in the UUT controlling power flow to the AC input, and note the existence of such a switch in the final test report.
ii Operate the UUT at 100% of nameplate output current for at least 30 minutes immediately prior to conducting efficiency measurements. After this warm-up period, monitor AC input power for a period of 5
minutes to assess the stability of the UUT. If the power level does not drift by more than 1% from the maximum value observed, the UUT is considered stable. If the UUT is stable, record the measurements obtained at the end of this 5-minute period. Measure subsequent loading conditions under the same 5-minute stability parameters. Note that only one warm-up period of 30 minutes is required for each UUT at the beginning of the test procedure. If the AC input power is not stable over a 5-minute period, follow the guidelines established by section 5.3.3 of IEC
62301 for measuring average power or accumulated energy over time for both input and output.
iii Test the UUT at the nameplate output voltages at the loading conditions listed in Table 2 of this section, derated per the proportional allocation method presented in section 5b1iv of this appendix. Active or passive loads used for efficiency testing of the UUT must maintain the required current loading set point for each output voltage within an accuracy of 0.5%. Conduct efficiency measurements in sequence from Loading Condition 1 to Loading Condition 4
as indicated in Table 2 of this section. For Loading Condition 5, place the UUT in noload mode, disconnect any additional signal connections to the UUT, and measure input power.

TABLE 2LOADING CONDITIONS FOR UNIT UNDER TEST
Condition Condition Condition Condition Condition
1 2
3 4
5

The 2% allowance pertains to nameplate output current, not the calculated current value. For example, a UUT at Loading Condition 3 may be tested in a range from 48% to 52% of the derated output current.
A If testing of additional, optional loading conditions is desired, conduct that testing in accordance with this test procedure and subsequent to completing the sequence described in section 5b1iii of this appendix.
B Where the external power supply lists both an instantaneous and continuous output current, test the external power supply at the continuous condition only.
C If an external power supply cannot sustain output at one or more of the Loading Conditions 14 as specified in Table 2 of this section, test the external power supply only
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100% of Derated Nameplate Output Current 2%.
75% of Derated Nameplate Output Current 2%.
50% of Derated Nameplate Output Current 2%.
25% of Derated Nameplate Output Current 2%.
0%.

at the loading conditions for which it can sustain output.
iv Use the following proportional allocation method to provide consistent loading conditions for multiple-voltage external power supplies. For additional explanation provided for guidance only, please refer to section 6.1.1 of the California Energy Commissions Proposed Test Protocol for Calculating the Energy Efficiency of Internal Ac-Dc Power Supplies Revision 6.7, March 2014.
A Consider a power supply with N output busses, and nameplate output voltages V1, , VN, corresponding output current ratings I1, , IN, and a maximum output power P as specified on the manufacturers label on the power supply housing, or, if absent from the housing, as specified in the documentation provided with the unit by the
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manufacturer. Calculate the derating factor D
by dividing the power supply maximum output power P by the sum of the maximum output powers of the individual output busses, equal to the product of bus nameplate output voltage and current IiVi, as follows:

B If D 1, then loading every bus to its nameplate output current does not exceed the overall maximum output power for the power supply. In this case, load each output bus to the percentages of its nameplate output current listed in Table 2 of this section. However, if D <1, it is an indication that loading each bus to its nameplate output current will exceed the overall maximum
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