| 摘要 |
PROBLEM TO BE SOLVED: To provide systems and methods of wireless power transmission for adjusting operating characteristics of antennas so as to adapt to different circumstances and optimize power transfer characteristics.SOLUTION: A transmitting device or receiving device for use in a wireless transfer system may be equipment or a household appliance. A transmitting device 200 includes a transmit antenna to wirelessly transfer power to a receive antenna by generating a near field radiation within a coupling-mode region. An amplifier 210 applies an RF signal to the transmit antenna. A presence detector (load sensing circuit 216) detects the presence of a receiver device within the coupling-mode region. A controller adjusts a power output of the amplifier in response to the presence of a receiver device. The presence detector may also detect human presence. The power output may be adjusted at or below a regulatory level when the presence signal indicates human presence, and above the regulatory level when the presence signal indicates human absence.SELECTED DRAWING: Figure 11 |
