FCC Record, Volume 34, No. 14, Pages 11031 to 11845, November 25 - December 6, 2019 Page: 11,753
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receiving units located at a distance from the transfer unit, as this type of equipment may not meet the
above proposed definition for "local" operation? We invite comments and input on these issues.
141. Locally operated wireless power transfer system. Part 18 allows the use of potentially
unlimited power if a device operates within a designated Industrial, Scientific and Medical (ISM)
frequency band,380 so long as the device operates "locally."38' Because the rules do not define what would
constitute "local" usage, measurement and compliance challenges arise in assessing wireless power
transfer devices that provide charging of receiving units located at a distance from the wireless power
transfer transmitting unit. We seek comment on whether the term "local" should be defined in terms of
distance between the transmitting and receiving units. If we define "local" based on this distance, what is
the maximum distance between the transmitting and receiving units that should be considered as "local"
operation?
142. We note that CISPR382 is considering a definition for the primary device of a wireless
power transfer system that states that the term "local" is used differently in the context of wireless power
transfer from other ISM devices: "for the case of WPT systems that operate inductively, 'local"' may
imply that the separation distance between the primary (TU) and secondary (RU) WPT devices should not
be greater than 50 centimeters (cm)."383 Based on CISPR's proposal, should we use 50 cm as the
maximum distance for wireless power transfer devices that operate "locally" (excluding wireless power
transfer at-a-distance devices, as discussed below) under Part 18?
143. Wireless power transfer at-a-distance. We seek comment on a suitable definition and
operating parameters for wireless power transfer devices that provide charging of receiving units located
at a distance from the power transfer unit (i.e., 50 cm or greater), with future developments intended at
distances suitable for room-size operation, and while the RU is in motion.384 This would cover wireless
380 There are eleven (11) designated ISM frequency bands with specific bandwidths. See 47 CFR 18.301.
381 47 CFR 18.107 requires ISM equipment "to generate and use locally RF energy." The Commission's rules as
well as other international standards do not quantify a specific distance for the term "local." The reason to limit RF
energy to "local use" in Part 18 is to prevent high-power RF energy reaching outside the immediate vicinity of the
RF generator source, which is allowed to operate at unlimited power to perform "work" (non-communication
functions) within the designated ISM frequency bands. See 47 CFR 18.305(a). Microwave ovens are probably the
best-known example of ISM consumer equipment in that they generate RF energy and use that energy locally to heat
food within the shielded oven structure. We note that CISPR has been actively involved in this area, see, e.g.,
CIS/B/710/CD (Aug. 2018), in which a "local" distance for WPT device should not be greater than 50 centimeters
(-20 inches). A proposal is also being considered by CISPR for WPT at-a-distance devices, proposing distances up
to 10 meters (30 feet) between the transmitting and the receiving units. In addition, so-called "wireless power
transmission" has been under consideration in ITU-R since the 1997 initiation of their ongoing Communication
Study Group 1, ITU-R 210 3/1, http://www.itint/pub/R-DUE-SGl.2 10.
382 CISPR (Comite International Sp6cial des Perturbations Radiodlectriques in French, International Special
Committee on Radio Interference in English) is a standards setting body that is part of the International
Electrotechnical Commission (IEC), which established international standards to control electromagnetic
interference in electrical and electronic devices.
383 See CIS/B/710/CD, Committee Draft, "Amendment 3 Fragment 1 to CISPR 11 Ed. 6: Industrial, scientific and
medical equipment - Radio-frequency disturbance characteristics - Limits and methods of measurement -
Requirements for air-gap wireless power transfer (WPT)," (August 2018); ); CIS/B/717/CC, "Compilation of
Comments on CIS/B/710/CD," (October 2018).
384 See e.g., Office of Engineering and Technology Seeks Comment on Auspion USA, Inc. Request for Waiver of
ISM "Local Use" Requirement in Parts 2 and 18 for a 24 GHz Wireless Power Transfer Device Over Distance, DA
19-211 (OET Mar. 26, 2019). GuRu (formerly Auspion) requests to operate a wireless charging system using the
24 GHz ISM band to charge receiving devices located at distances greater than 3 feet (1 meter) from the charging
unit. GuRu is effectively requesting the Commission to waive the "local" definition to allow ISM devices that
"...employ phased arrays [antennas] to focus the energy within a small volume of space at a defined location within
(continued....)11753
FCC 19-126
Federal Communications Commission
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United States. Federal Communications Commission. FCC Record, Volume 34, No. 14, Pages 11031 to 11845, November 25 - December 6, 2019, book, December 2019; Washington D.C.. (https://digital.library.unt.edu/ark:/67531/metadc1637223/m1/731/: accessed July 18, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.