REVERSE LINK SIGNALING VIA RECEIVE ANTENNA IMPEDANCE MODULATION

摘要

Exemplary embodiments are directed to wireless power transfer including generating an electromagnetic field at a resonant frequency of a transmit antenna to create a coupling-mode region within a near-field of the transmit antenna. A receive antenna placed within the coupling-mode region resonates at or near the resonant frequency. The receive antenna extracts energy from a coupling between the two antennas. Signaling from the receive antenna to the transmit antenna is performed by generating a first power consumption state for the receive antenna to signal a first receive signal state and generating a second power consumption state for the receive antenna to signal a second receive signal state. Signaling from the transmit antenna to the receive antenna is performed by enabling the resonant frequency on the transmit antenna to signal a first transmit signal state and disabling the resonant frequency on the transmit antenna to signal a second transmit signal state.

主权项

1. A wireless power transmitter, comprising:
a transmit antenna configured to generate a magnetic field for coupling charging power in a near-field of the magnetic field to a receive antenna to charge a load of a receiver device electrically coupled to the receive antenna; an amplifier configured to receive a power signal from a power supply, the amplifier configured to apply a first signal to the transmit antenna; and a load sensing circuit operably coupled to the amplifier and configured to detect a change in the power signal supplied to the amplifier,
wherein the load sensing circuit is configured to generate a receive signal responsive to the change in the power signal, andwherein the receive signal is indicative of a data communication from the receiver device communicated via the magnetic field.