Ferrite antennas for wireless power transfer
First Claim
1. A method of receiving power via a wireless field with a ferrite antenna, the ferrite antenna including a ferrite rod, a first coil, and a second coil physically unconnected to the first coil, the method comprising:
- receiving power via the wireless field with the first coil;
transferring the received power through the ferrite rod;
moving a position of at least one of the first coil and the second coil with respect to the ferrite rod so as to tune the ferrite antenna;
receiving, at the second coil, the transferred power; and
powering a device using the power received at the second coil.
2 Assignments
0 Petitions
Accused Products
Abstract
This disclosure provides systems, methods and apparatus for wireless power transfer using resonant ferrite antennas to transmit and receive power. Ferrite structures concentrate magnetic flux lines into the structure, thereby creating a magnetic path and field with less interference and eddy current losses than in device electronics, thereby improving the efficiency of magnetic power distribution. The disclosure describes tuning the resonance frequency by mechanically adjusting the position of the coil on the rod. The ferrite rod antennas described herein may be used to transfer power to handheld communication devices.
25 Citations
29 Claims
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1. A method of receiving power via a wireless field with a ferrite antenna, the ferrite antenna including a ferrite rod, a first coil, and a second coil physically unconnected to the first coil, the method comprising:
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receiving power via the wireless field with the first coil; transferring the received power through the ferrite rod; moving a position of at least one of the first coil and the second coil with respect to the ferrite rod so as to tune the ferrite antenna; receiving, at the second coil, the transferred power; and powering a device using the power received at the second coil. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A device for wireless power transfer, comprising:
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a housing; a ferrite antenna, supported by said housing, said ferrite antenna comprising a ferrite rod, a first coil connected to a capacitor, and a second coil physically unconnected to said first coil, a position of at least one of said first coil and said second coil being adjustable with respect to said ferrite rod; and a circuit coupled to said second coil and configured to receive power from said second coil, and configured to transfer said received power to a device within said housing. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A device for wireless power transfer, comprising:
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means for receiving power via a wireless field, the means for receiving power electrically coupled to a ferrite rod; means for adjusting power reception, the means for adjusting power reception comprising means for moving a position of at least the means for receiving, the position of at least the means for receiving being adjustable with respect to the ferrite rod; and means for transferring the received power to an electronic device, the means for transferring the received power being electrically coupled to the ferrite rod and physically unconnected to the means for receiving power via the wireless field. - View Dependent Claims (18, 19, 20, 21)
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22. A device for wireless power transfer, comprising:
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a housing; a ferrite antenna, supported by said housing, said ferrite antenna comprising a first coil and a second coil, said first coil being connected to a capacitor, and a position of at least one of said first coil and said second coil being adjustable with respect to said ferrite antenna; a tuning circuit coupled to said first coil and said second coil, said first coil connected to said second coil through said tuning circuit; and a receiving circuit coupled to said second coil and configured to receive power from said second coil, and to transfer said received power to a device within said housing. - View Dependent Claims (23, 24, 25)
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26. A method of receiving power via a wireless field with a ferrite antenna, the ferrite antenna including a ferrite rod, a first coil, a second coil, and a tuning circuit coupled to the first coil and the second coil, the method comprising:
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receiving power via the wireless field with the first coil; transferring the received power through the ferrite rod; receiving, at the second coil, the transferred power; powering a device using the power received at the second coil; and tuning the ferrite antenna based on a power received by the device. - View Dependent Claims (27)
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28. A device including a ferrite antenna, the device comprising:
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means for receiving power via a wireless field, the means for receiving power electrically coupled to a ferrite rod; means for transferring the received power to an electronic device, the means for transferring the received power being electrically coupled to the ferrite rod; and means for tuning the ferrite antenna based on power received by the electronic device. - View Dependent Claims (29)
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Specification