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Federal Register / Vol. 86, No. 209 / Tuesday, November 2, 2021 / Proposed Rules
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TABLE IIIIEXAMPLE OUTPUT CORD ELECTRICAL SPECIFICATIONS
Cord length feet
DC output current at 100% loading condition amps 01234I>5

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These example electrical specifications are based on common electrical specifications of output cords that DOE has observed in the market.
If DOE were to prescribe electrical specifications for output cords, DOE
seeks input from industry on what those electrical specifications should be, and/
or whether there exists an industry standard that contains specifications for electrical cables, which DOE could incorporate by reference.

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D. USBPD EPSs With Additional Optional Voltages and Currents and Programmable Power Supplies In the December 2019 NOPR, DOE
proposed to adopt a test procedure for USBPD EPSs also called adaptive EPSs that was prescribed in several granted test procedure waivers i.e., case Nos. EPS001, EPS002, EPS003, EPS
004, 2017014, 2018005, and 2018
010 11. 84 FR 67106, 6711167113
December 6, 2019. An adaptive EPS is one with an output bus 12 that can alter its output voltage based on an established digital communication protocol with the end-use application without any user-generated action. As described in the December 2019 NOPR, in granting the test procedure waivers for certain basic models of adaptive EPSs, DOE determined that, while such EPSs are very much in scope of the existing test procedure, continuing to apply the current set of instructions in appendix Y to them would yield results that would be unrepresentative of the active-mode efficiency of those products. 84 FR 67106, 67112
December 6, 2019. In granting the test procedure waivers, DOE concluded that when using a USBPD EPS to charge an end-use product at the lowest voltage level of 5 volts, the product would rarely draw more than 2 amps of current i.e., a power draw of more than 10W.
See 83 FR 11738, 11739 December 6, 11 See
also Case No. 2019005.
12 An output bus is defined as any of the outputs of the power supply to which loads can be connected and from which power can be drawn, as opposed to signal connections used for communication. Section 2 of appendix Z.

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2019. Nonetheless, for a USBPD EPS
with a nameplate output current of 3
amps, the current DOE test procedure requires that the EPSs efficiency be measured at a current of 3 amps at the lowest voltage condition of 5 volts i.e., a power draw of 15W. As a result, the efficiency of that EPS, when evaluated at that higher power draw 15W v. 10W, would result in a measurement that is unrepresentative of the actual energy consumption characteristics of the USBPD EPS being tested. See Id.
USBPD EPSs covered by the referenced waivers must be tested such that when testing at the lowest achievable output voltage i.e., 5 volts, the output current shall be 2 amps corresponding to an output power of 10W at the 100% loading condition.
The 75%, 50%, and 25% loading conditions are scaled accordingly under this alternate procedure i.e., 1.5 amps, 1 amp, and 0.5 amps, respectively.
When tested in this manner, the resulting power draws are 10W, 7.5W, 5W, and 2.5W; this result is in contrast to the existing test procedure at appendix Z, which requires power draws of 15W, 11.25W, 7.5W, and 3.75W at the 100%, 75%, 50%, and 25% loading conditions, respectively.
See 83 FR 11738, 1173911740 March 16, 2018. As a result, in the December 2019 NOPR, DOE proposed to amend appendix Z to adopt the alternate test procedure applicable to the adaptive EPSs covered by the test procedure waivers. 84 FR 67106, 67113 December 6, 2019.
In response to the proposed definition of USBPD EPS, ITI stated that the limitation in current and voltage via the phrase the voltages and currents must not exceed should be removed to avoid excluding USBPD EPSs with additional optional additional voltages and currents.13 ITI, No. 13 at p. 3
13 The IEC 6268012 specification describes the architecture, protocols, power supply behavior, connectors, and cabling necessary for managing power delivery over a USB. In addition to those voltage and current requirements specified in the previously proposed definition of a USBPD EPS, stakeholders commented that IEC 6268012 also
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According to ITI, the additional optional voltages and currents ensure that temperatures can be optimized inside laptop computers. Id. Moreover, ITI
commented that the proposed definition of a USBPD EPS does not include PPSs, which is defined in IEC 626801
2. Id. ITI stated that PPSs are able to output a minimum voltage of 3.3 volts, in contrast to the minimum voltage of 5
volts as specified in the proposed definition of a USBPD EPS, such that equating the 2A loading condition with 10W i.e., 2 amps at 5 volts creates a conflict when used with a PPS. Id.
Accordingly, ITI recommended that DOE replace reference to 10W with reference to 2A at the lowest nameplate output voltage. Id.
The alternate test procedure prescribed in the waivers references IEC
6268012:2017 and specified the voltage and current requirements contained therein. See 84 FR 59365
November 4, 2019; 83 FR 60830
November 27, 2018; 83 FR 50905
October 10, 2018; 83 FR 25448 June 1, 2018; and 83 FR 11738 March 16, 2018. The definition for USBPD EPSs proposed in the December 2019 NOPR
used the specific voltage and current requirements from IEC 6268012:2017
as referenced in the waiver petitions i.e., requiring USBPD EPSs to be rated at 3 amps at an output voltage of 5 volts, and: at no more than 3 amps at 9 volts;
at 3 amps at 15 volts, and; at 5 amps at 20 volts and required that only USB
PD EPSs meeting the proposed definition would be subject to the proposed test procedure. 84 FR 67106, 67113 December 6, 2019. PPSs were not specified in IEC 6268012 until a revised version, IEC 6268012:2018, published on April 12, 2018.
DOE expects USBPD EPSs with optional voltages and currents and PPSs to become more common in the market in the future as more end-use applications incorporate USBPD for charging purposes. Moreover, because PPSs employ the same communication technology as USBPD EPSs, DOE
specifies additional optional voltage and current limits for USBPD EPSs that should be included.

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