Tunable wireless power device
First Claim
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1. A device for providing wireless power, comprising:
- a transmit antenna configured to wirelessly transmit power via a magnetic field at a level sufficient to power or charge a chargeable device;
a metallic structure spaced at a non-zero distance and physically isolated from the transmit antenna, and configured to;
induce eddy currents to detune the transmit antenna, the eddy currents creating a magnetic field that opposes a change in the magnetic field generated by the transmit antenna, andshield the transmit antenna from another metallic structure to reduce eddy currents generated in the other metallic structure;
a magnetic material positioned between the transmit antenna and the metallic structure; and
a circuit configured to tune the transmit antenna in the presence of the metallic structure, the transmit antenna, the metallic structure, the magnetic material and the circuit integrated together.
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Abstract
Exemplary embodiments are directed to wireless power devices. A device may include a transmit antenna and a metallic structure spaced from and configured for detuning the transmit antenna. The device may further include a circuit for tuning the transmit antenna.
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Citations
18 Claims
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1. A device for providing wireless power, comprising:
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a transmit antenna configured to wirelessly transmit power via a magnetic field at a level sufficient to power or charge a chargeable device; a metallic structure spaced at a non-zero distance and physically isolated from the transmit antenna, and configured to; induce eddy currents to detune the transmit antenna, the eddy currents creating a magnetic field that opposes a change in the magnetic field generated by the transmit antenna, and shield the transmit antenna from another metallic structure to reduce eddy currents generated in the other metallic structure; a magnetic material positioned between the transmit antenna and the metallic structure; and a circuit configured to tune the transmit antenna in the presence of the metallic structure, the transmit antenna, the metallic structure, the magnetic material and the circuit integrated together. - View Dependent Claims (2, 3, 4, 5, 6, 7, 18)
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8. A method for providing wireless power, comprising:
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inducing eddy currents in a metallic structure within a wireless power device to detune a transmit antenna, the eddy currents creating a magnetic field that opposes a change in the magnetic field generated by the transmit antenna, an area of the metallic structure substantially equal to or greater than an area of the transmit antenna, the transmit antenna spaced at a non-zero distance and physically isolated from the metallic structure; shielding the transmit antenna via the metallic structure from another metallic structure to reduce eddy currents generated in the other metallic structure; and tuning the transmit antenna in the presence of the magnetic field and in the presence of a magnetic material proximate the metallic structure. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. A device for providing wireless power, comprising:
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means for generating a first magnetic field at a level sufficient to power or charge a chargeable device; means for inducing eddy currents, the eddy currents creating a second magnetic field that opposes a change of the first magnetic field; means for detuning the generating means, the detuning means shielding the generating means from another means for detuning the generating means to reduce eddy currents generated in the other detuning means, the detuning means being spaced a non-zero distance and physically isolated from the generating means; and means for tuning the generating means in the presence of a magnetic material proximate the detuning means. - View Dependent Claims (17)
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Specification