Wireless power transmission
First Claim
1. A power transmitting unit, comprising:
- a transmit coil configured to generate a magnetic field to wirelessly power a device within an active wireless charging area;
a power source to transmit an alternating electrical current (A/C) to an input terminal of the transmit coil;
a plurality of reactive elements placed in series with the transmit coil, wherein the plurality of reactive elements attach to the transmit coil at least a quarter of a turn from the input terminal; and
a controller to modify a reactance value of the reactive elements to adjust a current distribution of the transmit coil in response to detecting a characteristic of a power receiving unit, wherein the characteristic of the power receiving unit comprises a metal backing and modifying the reactance value comprises opening or closing a number of the reactive elements proximate a center of the transmit coil to adjust the current distribution, the controller to further establish a wireless communication with the power receiving unit, the wireless communication comprising data indicating a size of the device to be wirelessly powered and a wireless charging capability of the device.
2 Assignments
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Accused Products
Abstract
Techniques for modifying the electrical current distribution of transmit coil of a wireless power transmitting unit are described. An example power transmitting unit includes a transmit coil configured to generate a magnetic field to wirelessly power a device within an active wireless charging area. The power transmitting unit can also include a power source to transmit an alternating electrical current to an input terminal of the transmit coil and a plurality of reactive elements placed in series with the transmit coil. In some examples, the plurality of reactive elements attach to the transmit coil at least a quarter of a turn from the input terminal. The power transmitting unit can also include a controller to modify a reactance value of the reactive elements to adjust a current distribution of the transmit coil in response to detecting a characteristic of a power receiving unit.
13 Citations
21 Claims
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1. A power transmitting unit, comprising:
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a transmit coil configured to generate a magnetic field to wirelessly power a device within an active wireless charging area; a power source to transmit an alternating electrical current (A/C) to an input terminal of the transmit coil; a plurality of reactive elements placed in series with the transmit coil, wherein the plurality of reactive elements attach to the transmit coil at least a quarter of a turn from the input terminal; and a controller to modify a reactance value of the reactive elements to adjust a current distribution of the transmit coil in response to detecting a characteristic of a power receiving unit, wherein the characteristic of the power receiving unit comprises a metal backing and modifying the reactance value comprises opening or closing a number of the reactive elements proximate a center of the transmit coil to adjust the current distribution, the controller to further establish a wireless communication with the power receiving unit, the wireless communication comprising data indicating a size of the device to be wirelessly powered and a wireless charging capability of the device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of manufacturing a power transmitting unit, comprising:
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forming a transmit coil configured to generate a magnetic field to wirelessly power a device within an active wireless charging area; conductively coupling a power source to transmit an alternating electrical current to an input terminal of the transmit coil; conductively coupling a plurality of reactive elements placed in series with the transmit coil, wherein the plurality of reactive elements attach to the transmit coil at least a quarter of a turn from the input terminal; and conductively coupling a controller to the transmit coil to modify a reactance value of the reactive elements to adjust a current distribution of the transmit coil in response to detecting a characteristic of a power receiving unit, wherein the characteristic of the power receiving unit comprises a metal backing and modifying the reactance value comprises opening or closing a number of the reactive elements proximate a center of the transmit coil to adjust the current distribution, the controller to further establish a wireless communication with the power receiving unit, the wireless communication comprising data indicating a size of the device to be wirelessly powered and a wireless charging capability of the device. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A wireless charger, comprising:
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a transmit coil configured to generate a magnetic field to wirelessly power a device within an active wireless charging area; a power source to transmit an alternating electrical current to an input terminal of the transmit coil; a plurality of reactive elements placed in series with the transmit coil, wherein the plurality of reactive elements attach to the transmit coil at least a quarter of a turn from the input terminal; and a controller to modify a reactance value of the plurality of reactive elements to adjust a current distribution of the transmit coil in response to detecting a characteristic of a power receiving unit with a metal backing, the characteristic comprising a size of the power receiving unit, or a coupling distance between the power transmitting unit and the power receiving unit, wherein modifying the reactance value comprises opening or closing a number of the reactive elements proximate a center of the transmit coil to adjust the current distribution, the controller to further establish a wireless communication with the power receiving unit, the wireless communication comprising data indicating a size of the device to be wirelessly powered and a wireless charging capability of the device. - View Dependent Claims (18, 19, 20, 21)
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Specification