SYSTEMS AND METHODS FOR ADJUSTING MAGNETIC FIELD DISTRIBUTION USING FERROMAGNETIC MATERIAL
First Claim
1. A device for wireless power transfer, comprising:
- a substantially planar transmit antenna configured to generate a magnetic field;
a pad having a charging surface, at least a portion of the transmit antenna being disposed in the pad; and
a ferromagnetic material having a shape and a position relative to the transmit antenna, at least one of the shape or position of the ferromagnetic material, or combination thereof, selected to modify a distribution of the magnetic field at the charging surface.
2 Assignments
0 Petitions
Accused Products
Abstract
A uniform magnetic field may provide better performance in wireless power transmitters due to smaller impedance variations in an output of a power amplifier of a wireless power transmitter and also allow for wireless power transmitter pads to be thinner. One aspect of the disclosure provides a device for wireless power transfer. The device comprises a substantially planar transmit antenna that is configured to generate a magnetic field. The device also comprises a pad having a charging surface. At least a portion of the transmit antenna is disposed in the pad. The device also comprises a ferromagnetic material having a shape and a position relative to the transmit antenna. At least one of the shape or position of the ferromagnetic material, or a combination thereof, is selected to modify a distribution of the magnetic field at the charging surface.
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Citations
30 Claims
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1. A device for wireless power transfer, comprising:
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a substantially planar transmit antenna configured to generate a magnetic field; a pad having a charging surface, at least a portion of the transmit antenna being disposed in the pad; and a ferromagnetic material having a shape and a position relative to the transmit antenna, at least one of the shape or position of the ferromagnetic material, or combination thereof, selected to modify a distribution of the magnetic field at the charging surface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method for wireless power transfer, comprising:
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generating a magnetic field at a substantially planar transmit antenna, at least a portion of the transmit antenna disposed in a pad; and modifying a distribution of the magnetic field at a charging surface of the pad using ferromagnetic material having a shape and positioned relative to the transmit antenna. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21)
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22. A device for wireless power transfer, comprising:
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means for generating a magnetic field, at least a portion of the magnetic field generating means disposed in a pad; and means for modifying a distribution of the magnetic field at a charging surface of the pad, the magnetic field distribution modifying means having a shape and positioned relative to the magnetic field generating means. - View Dependent Claims (23, 24)
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25. An apparatus for wirelessly transferring charging power to one or more receiver devices, the apparatus comprising:
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a coil configured to generate a magnetic field for wirelessly transferring the charging power to the one or more receiver devices, the coil having a shape defining a first plane; a housing configured to house the coil, the housing having a surface configured to allow positioning the one or more receiver devices thereon, the surface defining a second plane substantially parallel to the first plane of the coil; and a ferromagnetic material positioned between the coil and the surface. - View Dependent Claims (26, 27, 28, 29, 30)
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Specification