期刊
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
卷 65, 期 4, 页码 1077-1086出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TMTT.2017.2673820
关键词
Airfuel alliance (AFA); loosely coupled resonant system; magnetic resonance; metal body wireless charging
资金
- Qualcomm WiPower team
Conventional tightly coupled inductive charging has been popular in the mobile device market for years. However, tightly coupled solutions have been unable to efficiently charge a metal encased device due to substantial heat generation. In this paper, we demonstrate that loosely coupled inductive charging technology is a viable solution to charge a metal encased device. Ample power can be delivered through the metal case with negligible case heating. Our prototype is built by machining a lump of aluminum which is attached to a commercial smart phone. Resonator coupling efficiency is measured to be 90% with a certified AirFuel Alliance transmitter. Measured power to a load is 8.2 W, which is suitable for mobile devices.
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