Systems and methods for detecting and protecting a wireless power communication device in a wireless power system

摘要

Embodiments are directed to detecting and limiting power transfer to communication device, such as NFC and RFID cards. A method may include detecting one or more communication devices positioned within a wireless power transfer region of a wireless power transmitter. The method may further include limiting an amount of power transmitted by a transmitter in response to the detection.

主权项

1. A method of detecting a communication device within a wireless power transfer region of a wireless power transmitter configured to transfer power to a device, the method comprising:
generating a wireless power transfer field at a power level; transmitting a first signal at a first frequency and a second signal at a second frequency; and detecting a third signal at a third frequency, the third frequency corresponding to an intermodulation product of the first frequency and the second frequency; and reducing the power level of the wireless power transfer field in response to the detection of the third signal.