Wireless power apparatus and methods
First Claim
Patent Images
1. A method of transferring power, comprising:
- transmitting power from a transmitter to a receiver, wherein the transmitter comprisesa coupling loop driven by a source, anda resonating circuit magnetically coupled to the coupling loop, and spaced apart from the coupling loop, the resonating circuit comprisingan inductive loop antenna, anda capacitor electrically coupled to the inductive loop antenna, the inductive loop antenna spaced apart from the coupling loop, the coupling loop configured to inductively excite the resonating circuit, and the coupling loop further configured to provide matching between the source and the resonating circuit based at least in part on the spacing between the coupling loop and the resonating circuit, the resonating circuit configured to generate a magnetic field based on being excited by the coupling loop to transmit power sufficient to charge or power a load of the receiver;
receiving signaling information from the receiver, the signaling information indicating a level of received power as determined by the receiver;
comparing the level of the received power to a level of the transmitted power; and
tuning the resonant frequency of the transmitter based at least in part on the comparison of the level of the received power to the level of the transmitted power.
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Abstract
Wireless energy transfer system. Antennas are maintained at resonance with High Q. Techniques of maintaining the high-Q resonance matching are disclosed.
300 Citations
49 Claims
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1. A method of transferring power, comprising:
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transmitting power from a transmitter to a receiver, wherein the transmitter comprises a coupling loop driven by a source, and a resonating circuit magnetically coupled to the coupling loop, and spaced apart from the coupling loop, the resonating circuit comprising an inductive loop antenna, and a capacitor electrically coupled to the inductive loop antenna, the inductive loop antenna spaced apart from the coupling loop, the coupling loop configured to inductively excite the resonating circuit, and the coupling loop further configured to provide matching between the source and the resonating circuit based at least in part on the spacing between the coupling loop and the resonating circuit, the resonating circuit configured to generate a magnetic field based on being excited by the coupling loop to transmit power sufficient to charge or power a load of the receiver; receiving signaling information from the receiver, the signaling information indicating a level of received power as determined by the receiver; comparing the level of the received power to a level of the transmitted power; and tuning the resonant frequency of the transmitter based at least in part on the comparison of the level of the received power to the level of the transmitted power. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 30)
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15. A wireless power transmitter, comprising:
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a coupling loop driven by a source; a resonating circuit magnetically coupled to the coupling loop, and spaced apart from the coupling loop, the resonating circuit comprising an inductive loop antenna and a capacitor electrically coupled to the inductive loop antenna, the inductive loop antenna spaced apart from the coupling loop, the coupling loop configured to inductively excite the resonating circuit, and the coupling loop further configured to provide matching between the source and the resonating circuit based at least in part on the spacing between the coupling loop and the resonating circuit, the resonating circuit configured to generate a magnetic field based on being excited by the coupling loop to transmit power sufficient to charge or power a load of a receiver; a receiving signaling information circuit configured to receive signaling information from the receiver, the signaling information indicating a level of received power as determined by the receiver, and the receiving signaling information circuit further configured to compare the level of the received power to a level of the transmitted power; and a tuning circuit configured to tune the resonant frequency of the inductive loop antenna based at least in part on the comparison of the level of the received power to the level of the transmitted power. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 31)
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27. A system for transferring power, the system comprising:
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means for transmitting power to a receiver, wherein the transmitting means comprises a coupling loop driven by a source; and a resonating circuit magnetically coupled to the coupling loop and spaced apart from the coupling loop, the resonating circuit comprising an inductive loop antenna; and a capacitor electrically coupled to the inductive loop antenna, the inductive loop antenna spaced apart from the coupling loop, the coupling loop configured to inductively excite the resonating circuit and the coupling loop further configured to provide matching between the source and the resonating circuit based at least in part on the spacing between the coupling loop and the resonating circuit, the resonating circuit configured to generate a magnetic field based on being excited by the coupling loop to transmit power sufficient to charge or power a load of the receiver; means for receiving signaling information from the receiver, the signaling information indicating a level of received power as determined by the receiver; means for comparing the level of the received power to a level of the transmitted power; and means for tuning the resonant frequency of the transmitting means based at least in part on the comparison of the level of the received power to the level of the transmitted power.
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28. A system for transferring power, the system comprising:
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a power transmitter configured to transmit power to a receiving antenna of a receiver, wherein the power transmitter comprises a coupling loop driven by a source, and a resonating circuit magnetically coupled to the coupling loop, and spaced apart from the coupling loop, the resonating circuit and comprising an inductive loop antenna and a capacitor electrically coupled to the inductive loop antenna, the inductive loop antenna spaced apart from the coupling loop, the coupling loop configured to inductively excite the resonating circuit and the coupling loop further configured to provide matching between the source and the resonating circuit based at least in part on the spacing between the coupling loop and the resonating circuit, the resonating circuit configured to generate a magnetic field based on being excited by the coupling loop to transmit power sufficient to charge or power a load of the receiver; a signaling information receiver configured to receive signaling information from the receiver, the signaling information indicating a level of received power as determined by the receiver, and the signaling information receiver further configured to compare the level of the received power to a level of the transmitted power; and a controller configured to tune the resonant frequency of the power transmitter based at least in part on the comparison of the level of the received power to the level of the transmitted power.
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29. A wireless power transmitter, comprising:
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means for transmitting power to a receiver, wherein the transmitting means comprises a coupling loop driven by a source; and a resonating circuit magnetically coupled to the coupling loop, and spaced apart from the coupling loop, the resonating circuit comprising an inductive loop antenna and a capacitor electrically coupled to the inductive loop antenna, the inductive loop antenna spaced apart from the coupling loop, the coupling loop configured to inductively excite the resonating circuit and the coupling loop further configured to provide matching between the source and the resonating circuit based at least in part on the spacing between the coupling loop and the resonating circuit, the resonating circuit configured to generate a magnetic field based on being excited by the coupling loop to transmit power sufficient to charge or power a load of the receiver; a receiving signaling information circuit configured to receive signaling information from the receiver, the signaling information indicating a level of received power as determined by the receiver, and the receiving signaling information circuit further configured to compare the level of the received power to a level of the transmitted power; and a tuning circuit configured to tune the resonant frequency of the inductive loop antenna based at least in part on the comparison of the level of the received power to the level of the transmitted power.
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32. A wireless power transmitter, comprising:
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a coupling loop driven by a source; a resonating circuit magnetically coupled to the coupling loop, and spaced apart from the coupling loop, the resonating circuit comprising an inductive loop antenna; and a capacitor electrically coupled to the inductive loop antenna, the coupling loop configured to inductively excite the resonating circuit and the coupling loop further configured to provide matching between the source and the resonating circuit based at least in part on the spacing between the coupling loop and the resonating circuit, the resonating circuit configured to generate a magnetic field based on being excited by the coupling loop to transmit power sufficient to charge or power a load of a receiver. - View Dependent Claims (33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49)
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Specification