SYSTEMS AND METHODS FOR DETECTING AND PROTECTING A WIRELESS POWER COMMUNICATION DEVICE IN A WIRELESS POWER SYSTEM
First Claim
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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;
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.
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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.
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Citations
20 Claims
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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:
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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; 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An apparatus comprising:
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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. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. An apparatus for detecting a communication device within a wireless power transfer region, the apparatus comprising:
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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. - View Dependent Claims (17, 18)
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19. 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:
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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. - View Dependent Claims (20)
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Specification