IMPEDANCE CHANGE DETECTION IN WIRELESS POWER TRANSMISSION
摘要
Exemplary embodiments are directed to wireless power transfer. Energy from a transmit antenna is coupled to internal signals on a transmitter. An impedance measurement circuit generates an impedance indication signal for indicating an impedance difference between the coupled internal signals by comparing them. A controller samples the impedance indication signal and determines digital signaling values responsive to changes in the impedance indication signal. The impedance measurement circuit measures one or more of magnitude difference of the internal signals, phase difference of the internal signals, and changes in power consumed by an amplifier coupled between the RF signal and the transmit antenna. A transmitter generates the electromagnetic field with a transmit antenna responsive to a Radio Frequency (RF) signal to create a coupling-mode region within a near field of the transmit antenna.
申请公布号
EP2389730(A1)
申请公布日期
2011.11.30
申请号
EP20100701435
申请日期
2010.01.22
申请人
QUALCOMM INCORPORATED
发明人
VON NOVAK, WILLIAM, H.;TONCICH, STANLEY, S.;RIMINI, ROBERTO;LEE, KEVIN, D.