Patent ID: 9252846
Filing Date: 2016-02-02
CPC Classification: H02J,H04B

Claim Text:
1. An apparatus for detecting an object within a power delivery region of a wireless power transmitter configured to transfer power to a device having a wireless power receiver, the apparatus comprising: a driver configured to generate a driving signal to drive a circuit to output a wireless power field; a sensor configured to sense an amount of power drawn by the driver to generate a sensing signal; a communication unit configured to receive, from the wireless power receiver, a signal indicative of a change in power received by the wireless power receiver, the signal including information regarding a direction of change in current, a direction of change in voltage, and a magnitude of the change in power received by the wireless power receiver; and a controller configured to monitor a change in a power drawn by the driver based on the sensing signal and identify the type of object based at least in part on a comparison of the direction of change in current, the direction of change in voltage, and the magnitude of the change in power received by the wireless power receiver and the monitored change in power drawn, the controller further configured to compare the change in power drawn to a first threshold and the received signal to a second threshold.