The 21st Meeting of the APT Wireless Group (AWG-21) / AWG-21/INP-08
3 – 7 April 2017, Bangkok, Thailand /
24March 2017
Apple South Asia Pte Ltd
Proposal for the Development of a DRAFT apt recommendation on frequency range for non-beam wpt for mobile devices
Introduction
APT Recommendation on frequency ranges for non-beam WPT technologies for mobile devices is being developed by APT.
AWG has completed a report on wireless power transmission ( WPT) with below frequency ranges inNon-ISM bands.
19 kHz – 21 kHz
42 kHz- 48 kHz:
52 kHz – 58 kHz
59 kHz - 61 kHz:
79 kHz - 90 kHz
110 kHz -205 kHz:
425 kHz - 524 kHz
Frequency bands and key parameters for different applications are summarized in Table 5.1 of report APT/AWG/REP-62(Rev.1).
Table 5.1 Frequency ranges under study, key parameters, incumbent systems on WPT systems for mobile/portable devices and home/office equipment
Tightly Coupled (Inductive; low power) / Loosely Coupled(Resonant) / Tightly Coupled
(Inductive; high power) / Capacitive Coupling
Application types / Mobile/ portable devices, tablets, note-PCs (e.g., WPC/Qi) / Mobile devices, tablets, note-PCs (e.g.,A4WP[20]) / Home appliances, office equipment (incl. higher power applications) / Mobile devices, Tablets, note-PCs
Technology Principle / Magnetic induction / High resonance / Magnetic induction / Electric field induction
Names of countries considering / Commercially available in Japan, Korea / Japan, Korea / Japan / Japan
Frequency Ranges under considerations / Japan:
110kHz–205kHz.
Korea:
100kHz–205kHz / Japan, Korea :
6.765 MHz -6.795 MHz / Japan:
20.05 kHz - 38 kHz,
42 kHz - 58 kHz,
62 kHz – 100 kHz / Japan: 425 kHz-524 kHz
Power Range under considerations / Japan:
Several W – up to 100W
Korea:
Unlimited in-band emission limit / Japan:
Several W – 1.5kW / Japan:
Up to 100 W
Advantage / Global harmonized spectrum
Higher power transfer efficiency / - Global spectrum availability possible
- Flexibility for placement and distance of receiving end
- Transmitter can supply power for several receivers within a wide range contemporary. / - Increased power
- Flexibility for placement and distance of receiving end
- Transmitter can supply power for several receivers within a wide range contemporary. / High efficiency (70-85%)
-No heat generation at the electrode
- Low emission level
- horizontal position freedom
Application Areas / Mobile devices, portable devices, CE,
Industrial Fields, Specific Areas / Mobile devices, tablets, note-PCs, home appliances (low power) / Home appliance (high power), office equipment / Portable devices,tablets, note-PCs,home and office equipment
Related Alliances / international standards / Wireless Power Consortium (WPC)[13] / A4WP [20]
Concerned incumbents for spectrum sharing / China: Needs a special approval from the administration
.
ISM incumbents
Japan:
mobile/fixed radio systems
Korea:
ISM band / Japan:
Standard clock radios (40 kHz, 60 kHz)
Railway radio systems (10kHz – 250 kHz)
Coexistence has not been demonstrated for some incumbent cases (as of March 2015). / Japan:
AM Broadcast (526.5kHz - 1606.5 kHz), Maritime/NAVTEX (405kHz -526.5 kHz),and
Amateur radio (472kHz - 479 kHz).
Proposals
We recommend toidentify205 – 500 KHz as needing further study for worldwide harmonization of WPT frequencies.
And we also propose APT to submit the new frequency range to ITU-R WP1A and WP1B for WPT recommendation.
Related Document
[1]Report ITU-R SM2303-1 “Wireless power transmission using technologies other than radio frequency beam”
[2]APT-AWG-REP-62Rev.1_APT_Report_on_WPT: “APT Report on Wireless Power Transmission ( WPT)”
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