Electronic devices with wireless charging antenna arrays
First Claim
1. A wireless charging mat for transmitting wireless power to an electronic device while the electronic device is placed on the wireless charging mat, the wireless charging mat comprising:
- a plurality of antennas that includes a selected transmit antenna configured to transmit wireless charging signals to the electronic device and that includes a set of antennas that surrounds the selected transmit antenna;
wireless charging circuitry operatively coupled to the plurality of antennas; and
control circuitry coupled to the wireless charging circuitry, wherein the control circuitry is configured to control the wireless charging circuitry to transmit the wireless charging signals over the selected transmit antenna and wherein the control circuitry is configured to control the set of antennas to form a guard ring structure for the selected transmit antenna.
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Accused Products
Abstract
An electronic device may transfer power wirelessly to an external device. The electronic device may include a housing having a cavity. A cover layer may be formed over the cavity. An array of antennas may be formed within the cavity. Antennas in the array may transfer wireless charging signals to the external device through the cover layer to charge the external device while the external device is in contact with the cover layer. Impedance detection circuitry may gather impedance matching information from each antenna in the array. Control circuitry may select an antenna having a best impedance match with the external device for transmitting the wireless charging signals. One or more antennas in the array may form a block filter for the selected antenna. Multiple near-field coupled antennas in the array may be selected for transmitting the charging signals to focus the charging signals on the external device.
29 Citations
19 Claims
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1. A wireless charging mat for transmitting wireless power to an electronic device while the electronic device is placed on the wireless charging mat, the wireless charging mat comprising:
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a plurality of antennas that includes a selected transmit antenna configured to transmit wireless charging signals to the electronic device and that includes a set of antennas that surrounds the selected transmit antenna; wireless charging circuitry operatively coupled to the plurality of antennas; and control circuitry coupled to the wireless charging circuitry, wherein the control circuitry is configured to control the wireless charging circuitry to transmit the wireless charging signals over the selected transmit antenna and wherein the control circuitry is configured to control the set of antennas to form a guard ring structure for the selected transmit antenna. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An electronic device configured to wirelessly transfer power to an external device, the electronic device comprising:
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a housing; wireless power transfer circuitry in the housing; a cavity formed in the housing; a cover layer positioned over the cavity; a plurality of antennas within the cavity, wherein at least one antenna in the plurality of antennas is configured to transmit wireless charging signals at a transmit frequency from the wireless power transfer circuitry to the external device through the cover layer while the external device is on the cover layer, the transmit frequency being greater than 1 GHz, wherein the plurality of antennas in the cavity comprises an array of patch antennas; and control circuitry coupled to the wireless power transfer circuitry, wherein the control circuitry is configured to; select a patch antenna in the array to transmit the wireless charging signals to the external device, and disable a ring of patch antennas around the selected patch antenna in the array to form a guard ring structure for the selected patch antenna, wherein the guard ring structure is configured to block at least some of the wireless charging signals at the transmit frequency. - View Dependent Claims (13, 14)
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15. An electronic device configured to provide wireless power to an external device that is placed on the electronic device, the electronic device comprising:
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wireless power transfer circuitry that is configured to generate wireless charging signals; a plurality of antennas operatively coupled to the wireless power transfer circuitry; and control circuitry coupled to the wireless power transfer circuitry, wherein the control circuitry is configured to control the wireless power transfer circuitry to transmit the wireless charging signals over a selected antenna of the plurality of antennas, wherein the control circuitry is configured to control a set of antennas in the plurality of antennas that is adjacent to the selected antenna to form a filter, and wherein the filter is configured to block at least some of the transmitted wireless charging signals from being transmitted past the set of antennas. - View Dependent Claims (16, 17, 18, 19)
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Specification