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WIRELESS POWER TRANSFER Selecting the right inductor for wireless power transfer
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2 22.01.2018 | Only for WE customers | Wireless Power FED
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WIRELESS POWER Standards
Closely coupled
• Wireless Power Consortium (Qi)
− Power transfer using resonant tank at very low
frequency over short distances.
− Resonant tank at 100 – 205 kHz.
− 2009 “Low Power” 5W
− 2015 “Medium Power” 15W
− 2016/17 resonant upgrade
Loosely coupled (and closely coupled)
• AirFuel Alliance
− Power transfer based on resonant tank at very
high frequency over longer distances (40mm).
− Ability to charge multiple devices at same time.
− Resonant tank at 300kHz and 6.78MHz. (ISM
Band)
− Capability up to *30W systems.
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3 22.01.2018 | Only for WE customers | Wireless Power FED
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Wireless Power Transmitter and Receiver
Pictures: Samsung website, Würth Elektronik
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4 22.01.2018 | Only for WE customers | Wireless Power FED
© All rights reserved by Würth Elektronik, also in the event of industrial property rights. All rights of disposal such as copying and redistribution rights with us. www.we-online.com
Coil Types - Freedom of Positioning
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5 22.01.2018 | Only for WE customers | Wireless Power FED
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Improvement using ferromagnetic shielding
Without shielding
With shielding
Tx_Rx with shielding
Page 6
6 22.01.2018 | Only for WE customers | Wireless Power FED
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Magnetic Field Simulation
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7 22.01.2018 | Only for WE customers | Wireless Power FED
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EMI Measurement at Receiver Side
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8 22.01.2018 | Only for WE customers | Wireless Power FED
© All rights reserved by Würth Elektronik, also in the event of industrial property rights. All rights of disposal such as copying and redistribution rights with us. www.we-online.com
Small Rx coils and standard Tx coils
The new Rx coils for wearables need the small Tx coils!
760308101214 with 19mm diameter is the largest working with all Tx
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9 22.01.2018 | Only for WE customers | Wireless Power FED
© All rights reserved by Würth Elektronik, also in the event of industrial property rights. All rights of disposal such as copying and redistribution rights with us. www.we-online.com
Transmitter Coils
Receiver Coils
WE Wireless Power Coils -
http://katalog.we-online.de/en/pbs/browse/Power_Magnetics/Wireless_Power_Transmission
http://www.we-online.de/web/de/electronic_components/produkte_pb/demoboards/wireless_power/wireless_power_1.php
Page 10
10 22.01.2018 | Only for WE customers | Wireless Power FED
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Page 11
11 22.01.2018 | Only for WE customers | Wireless Power FED
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Qi Medium Power 15W Demo Kit ROHM/Würth Elektronik
Page 12
12 22.01.2018 | Only for WE customers | Wireless Power FED
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Buy only Qi devices in the future