Shield for a wireless power transmitter
First Claim
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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 generating circuitry to deliver a current to the transmit coil to generate the magnetic field at an operating frequency; and
a patch array disposed in parallel with the transmit coil to reduce a strength of the magnetic field at frequencies outside of the operating frequency during operation of the power transmitting unit;
wherein the patch array comprises an array of conductive patches coupled to a ground plane disposed in parallel with the array of conductive patches;
wherein the array of conductive patches are separated from the ground plane by an insulating material and conductively coupled to the ground plane by a via through the insulating material; and
wherein the array of conductive patches comprise an outer patch separated from the via by a gap, wherein the outer patch is conductively coupled to the via through an LC circuit.
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Abstract
Techniques for focusing an energy radiated by 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 also includes a power generating circuitry to deliver a current to the transmit coil to generate the magnetic field. The power transmitting unit also includes a patch array disposed in parallel with the transmit coil to reduce a strength of the magnetic field at frequencies outside of the operating frequency during operation of the power transmitting unit.
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Citations
15 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 generating circuitry to deliver a current to the transmit coil to generate the magnetic field at an operating frequency; and a patch array disposed in parallel with the transmit coil to reduce a strength of the magnetic field at frequencies outside of the operating frequency during operation of the power transmitting unit; wherein the patch array comprises an array of conductive patches coupled to a ground plane disposed in parallel with the array of conductive patches; wherein the array of conductive patches are separated from the ground plane by an insulating material and conductively coupled to the ground plane by a via through the insulating material; and wherein the array of conductive patches comprise an outer patch separated from the via by a gap, wherein the outer patch is conductively coupled to the via through an LC circuit. - View Dependent Claims (2, 3, 4, 5)
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6. A method of manufacturing a power transmitting unit, the method 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 generating circuitry to the transmit coil, the power generating circuitry to deliver a current to the transmit coil to generate the magnetic field at an operating frequency; and disposing a patch array in parallel with the transmit coil to reduce a strength of the magnetic field at frequencies outside of the operating frequency during operation of the power transmitting unit; wherein the patch array comprises an array of conductive patches coupled to a ground plane disposed in parallel with the array of conductive patches; wherein the patch array comprises an array of conductive patches coupled to a ground plane disposed in parallel with the array of conductive patches; and wherein the array of conductive patches are separated from the ground plane by an insulating material and conductively coupled to the ground plane by a via through the insulating material. - View Dependent Claims (7, 8, 9, 10)
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11. 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 generating circuitry to deliver a current to the transmit coil to generate the magnetic field at an operating frequency; and a patch array disposed in parallel with the transmit coil to reduce a strength of the magnetic field at frequencies outside of the operating frequency during operation of the wireless charger; wherein the patch array comprises an array of conductive patches coupled to a ground plane disposed in parallel with the array of conductive patches; wherein the array of conductive patches are separated from the ground plane by an insulating material and conductively coupled to the ground plane by a via through the insulating material; and wherein the array of conductive patches comprise an outer patch separated from the via by a gap, wherein the outer patch is conductively coupled to the via through an LC circuit. - View Dependent Claims (12, 13, 14, 15)
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Specification