Systems and methods for detecting and protecting a wireless power communication device in a wireless power system
AssigneeQUALCOMM Incorporated
InventorWilliam Anthony Drennen
Life of this patent
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Abstract
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.
Claims20
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.
An apparatus comprising:
- a wireless power transmitter configured to generate a wireless power transfer field at a power level;
- a detection signal transmitter configured to transmit a first signal at a first frequency and a second signal at a second frequency;
- a tone receiver configured to detect a third signal at a third frequency, the third frequency corresponding to an intermodulation product of the first frequency and the second frequency;
- and
- a controller configured to reduce the power level of the wireless power transfer field in response to the detection of the third signal.
An apparatus for detecting a communication device within a wireless power transfer region, the apparatus comprising:
- means for generating a wireless power transfer field at a power level;
- means for transmitting a first signal at a first frequency and a second signal at a second frequency;
- means for 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
- means for reducing the power level of the wireless power transfer field in response to the detection of the third signal.
A computer program product for processing data for a program configured to detect a communication device within a wireless power transfer region of a wireless power transmitter configured to transfer power to a device via a wireless power transfer field, the computer program product comprising:
- a non-transitory computer-readable medium having stored thereon code for causing processing circuitry to:
- transmit a first signal at a first frequency and a second signal at a second frequency;
- detect a third signal at a third frequency, the third frequency corresponding to an intermodulation product of the first frequency and the second frequency;
- and
- reduce a power level of the wireless power transfer field in response to the detection of the third signal.
Dependencies are inferred from the claim text.