Wireless charging system with object detection
First Claim
1. A wireless power transmitting device with a charging surface, comprising:
- a coil;
measurement circuitry coupled to the coil;
wireless power transmitting circuitry coupled to the coil and configured to transmit wireless power signals to a wireless power receiving device with the coil; and
control circuitry configured to control transmission of the wireless power signals, wherein the control circuitry is configured to operate in;
a first mode in which the control circuitry uses the wireless power transmitting circuitry and the coil to transmit the wireless power signals to the wireless power receiving device without transmitting wireless power to a radio-frequency identification device detected with the measurement circuitry that overlaps a portion of the charging surface that is non-overlapping with the coil; and
a second mode in which the control circuitry forgoes using the wireless power transmitting circuitry to transmit the wireless power signals to the wireless power receiving device upon detecting with the measurement circuitry that the radio-frequency identification device is overlapped by the wireless power receiving device.
1 Assignment
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Accused Products
Abstract
A wireless power transmitting device transmits wireless power signals to a wireless power receiving device using an output circuit that includes a wireless power transmitting coil. Measurement circuitry is coupled to the output circuit to help determine whether the wireless power receiving device is present and ready to accept transmission of wireless power. The measurement circuitry includes a measurement circuit that is coupled to the output circuit and that measures signals while oscillator circuitry supplies the output circuit with signals at a probe frequency. The measurement circuitry also includes a measurement circuit that is coupled to the output circuit and that measures signals while the oscillator circuitry sweeps signals applied to the output circuit between a first frequency and a second frequency to detect sensitive devices such as radio-frequency identification devices. Impulse response circuitry in the measurement circuitry is used to make inductance and Q factor measurements.
15 Citations
20 Claims
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1. A wireless power transmitting device with a charging surface, comprising:
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a coil; measurement circuitry coupled to the coil; wireless power transmitting circuitry coupled to the coil and configured to transmit wireless power signals to a wireless power receiving device with the coil; and control circuitry configured to control transmission of the wireless power signals, wherein the control circuitry is configured to operate in; a first mode in which the control circuitry uses the wireless power transmitting circuitry and the coil to transmit the wireless power signals to the wireless power receiving device without transmitting wireless power to a radio-frequency identification device detected with the measurement circuitry that overlaps a portion of the charging surface that is non-overlapping with the coil; and a second mode in which the control circuitry forgoes using the wireless power transmitting circuitry to transmit the wireless power signals to the wireless power receiving device upon detecting with the measurement circuitry that the radio-frequency identification device is overlapped by the wireless power receiving device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of using a wireless power transmitting device having wireless power transmitting circuitry that transmits wireless power signals to a wireless power receiving device using a coil, comprising:
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operating the wireless power transmitting device in a first mode in which the wireless power transmitting device uses the coil to transmit the wireless power signals to the wireless power receiving device without transmitting wireless power to a radio-frequency identification device that overlaps a portion of the wireless power transmitting device non-overlapping with the coil; and operating the wireless power transmitting device in a second mode in which the wireless power transmitting device forgoes transmitting the wireless power signals to the wireless power receiving device upon detecting that the radio-frequency identification device is overlapped by the wireless power receiving device. - View Dependent Claims (14, 15, 16, 17)
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18. A non-transitory computer readable storage medium, comprising instructions for:
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transmitting wireless power signals to a wireless power receiving device with wireless power transmitting circuitry coupled to a coil; operating control circuitry in a first mode in which the control circuitry uses the wireless power transmitting circuitry and the coil to transmit the wireless power signals to the wireless power receiving device without transmitting wireless power to a radio-frequency identification device that overlaps a portion of the wireless power transmitting circuitry that is laterally separated from the coil; and operating the control circuitry in a second mode in which the control circuitry forgoes using the wireless power transmitting circuitry to transmit the wireless power signals to the wireless power receiving device upon detecting that the radio-frequency identification device is overlapped by the wireless power receiving device. - View Dependent Claims (19, 20)
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Specification