Energy receiver, detection method, power transmission system, detection device, and energy transmitter
First Claim
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1. An energy receiver comprising:
- power receiving circuitry including a receiver coil configured to wirelessly receive power transmitted from a power transmitter;
detection circuitry directly connected to the power receiving circuitry, the detection circuitry comprising a Q factor detection circuit; and
test signal generation circuitry directly connected to the power receiving circuitry;
wherein,the detection circuitry is configured to determine a plurality of quality factor values for the power receiving circuit using the Q factor detection circuit and the test signal generation circuitry and then compare the determined plurality of quality factor values with a threshold quality factor value to detect presence of a foreign object, wherein when the foreign object is detected power receiving circuitry is configured to stop receiving power transmitted;
a power storage section configured to supply power to the Q factor detection circuit during detection of the foreign object; and
a communications unit in communication with the detection circuitry.
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Abstract
An energy receiver includes: a power receiver coil configured to wirelessly receive power transmitted from a power transmitter; a detection section configured to detect a foreign object; and a power storage section configured to supply power to the detection section during detection of the foreign object.
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Citations
22 Claims
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1. An energy receiver comprising:
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power receiving circuitry including a receiver coil configured to wirelessly receive power transmitted from a power transmitter; detection circuitry directly connected to the power receiving circuitry, the detection circuitry comprising a Q factor detection circuit; and test signal generation circuitry directly connected to the power receiving circuitry; wherein, the detection circuitry is configured to determine a plurality of quality factor values for the power receiving circuit using the Q factor detection circuit and the test signal generation circuitry and then compare the determined plurality of quality factor values with a threshold quality factor value to detect presence of a foreign object, wherein when the foreign object is detected power receiving circuitry is configured to stop receiving power transmitted; a power storage section configured to supply power to the Q factor detection circuit during detection of the foreign object; and a communications unit in communication with the detection circuitry. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A detection method comprising:
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charging a power storage device using power wirelessly received by a power receiver circuit including a power receiver coil; communicating with a wireless power transmitter to cause power transmitter to not transmit power, and then provide power stored by the power storage device to a detection circuit directly connected the power receiver; and detecting whether a foreign object is within a range of the power receiver coil by generating by a test signal generation circuit directly connected to the power receiver one or more test signals having different frequencies and determining various quality factor values for the power receiver circuit using Q factor detection circuitry within the detection circuit and the one or more test signals having different frequencies, and then comparing the determined quality factor values to a threshold quality factor value; and stopping power reception of the power receiver when the foreign object is detected. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A power transmission system comprising a power transmitter configured to wirelessly transmit power to a power receiver, wherein:
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the power transmitter includes (i) a power transmission coil to wirelessly transmit power to the power receiver, (ii) an AC signal power supply connected to the power transmission coil, (iii) a power transmitter communications section, and (iv) a power transmitter control section to control the supply of the AC signal to the power transmission coil in response to a signal transmitted from the power receiver and received via the power transmitter communications section, and the power receiver includes (i) power receiving circuitry including a receiver coil configured to wirelessly receive power transmitted from a power transmitter, (ii) detection circuitry comprising Q factor detection circuitry directly connected to the power receiving circuitry, (iii) test signal generation circuitry directly connected to power receiving circuitry, (iv) detection circuitry configured to determine a plurality of quality factor values for the power receiving circuitry using the Q factor detection circuitry and the test signal generation circuitry and then compare the determined plurality of quality factor values with a threshold quality factor value to detect presence of a foreign object, wherein when the foreign object is detected the power receiving circuitry is configured to stop receiving power transmitted, (v) a power storage section configured to supply power to the detection circuitry during detection of the foreign object, and (vi) a power receiver communications unit in communication with the detection circuitry. - View Dependent Claims (14, 15, 16, 17)
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18. A detection device comprising:
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power receiving circuitry including a power receiver coil configured to wirelessly receive power transmitted from a power transmitter; detection circuitry comprising Q factor detection circuitry directly connected to the power receiving circuitry; test signal generation circuitry capable of generating test signals at different frequencies; detection circuitry configured to determine a plurality of quality factor values for the power receiving section using the Q factor detection circuitry and test signals having different frequencies and to compare the determined quality factor values with a threshold quality factor value to detect presence of a foreign object, wherein when the foreign object is detected the power receiving circuitry is configured to stop receiving power transmitted; and a communications unit connected to the detection circuitry. - View Dependent Claims (19, 20, 21, 22)
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Specification