# US 2020/0403449 A1 · Uniform wireless charging device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2020/0403449 A1 - Document ID: US20200403449A1 - Status: Published application - Kind: A1 - Application number: 16/890,389 - Filed: 2020-06-02 - Published: 2020-12-24 - Earliest claimed: 2015-12-22 - Assignees: Intel Corporation - Applicants: Intel Corporation - Inventors: Essam Elkhouly; Songnan Yang; Zhen Yao - Web page: https://patentgrep.com/patent/US20200403449A1 ## CPC - H01F 38/14: Inductive couplings - H02J 50/12: of the resonant type - H02J 50/70: involving the reduction of electric, magnetic or electromagnetic leakage fields - H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES - H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY ## Abstract In a wireless charging device that includes a resonator having coil windings, a magnetic field can be generated by the resonator. The wireless charging device can include a feed point connected to an inner winding of the coil windings of the resonator. The resonator can inductively couple with a power receiving unit such that the an outer winding of the coil windings limit Eddy current generation in one or more conductive surfaces positioned adjacent to the power receiving unit. The feed point can be selectively connected to the inner winding of the coil in a first mode of operation and the outer winding of the coil in a second mode of operation. The inner winding can have a larger current than the outer winding. ## Claims ### Claim at position 1 1-22. (canceled) ### Claim 23 A wireless charging device, comprising: a resonator having coil windings that include an inner winding having an inner coupling and an outer winding having an outer coupling, wherein the wireless charging device is configured to be selectively operable in: a first mode of operation in which the inner coupling is connectable to a power source to power to the resonator; and a second mode of operation in which the outer coupling is connectable to the power source to power the resonator. ### Claim 24 (depends on 23) The wireless charging device of claim 23, wherein: in the first mode of operation, the outer coupling is electrically closed; and in the second mode of operation, the inner coupling is electrically closed. ### Claim 25 (depends on 24) The wireless charging device of claim 24, wherein the resonator further comprises an inline capacitor, the outer coupling being electrically closed via the inline capacitor in the first mode of operation and the inner coupling being electrically closed via the inline capacitor in the second mode of operation. ### Claim 26 (depends on 23) The wireless charging device of claim 23, further comprising a controller that is configured to control the wireless charging device to selectively operate in the first and second modes of operation. ### Claim 27 (depends on 23) The wireless charging device of claim 23, wherein the wireless charging device is configured to receive a control signal that controls the wireless charging device to selectively operate in the first and second modes of operation. ### Claim 28 (depends on 23) The wireless charging device of claim 23, further comprising one or more tuning capacitors connected in series between the power source and the coil windings. ### Claim 29 (depends on 23) The wireless charging device of claim 23, wherein the inner winding is an innermost winding of the coil windings and the outer winding is an outermost winding of the coil windings. ### Claim 30 (depends on 23) The wireless charging device of claim 23, wherein the outer winding of the coil windings has a higher impedance than the inner winding. ### Claim 31 (depends on 23) The wireless charging device of claim 23, wherein the coil windings are substantially concentrically arranged. ### Claim 32 (depends on 23) The wireless charging device of claim 23, wherein the resonator is configured to generate a larger current in the inner winding of the coil windings than the outer winding of the coil. ### Claim 33 (depends on 32) The wireless charging device of claim 32, wherein the resonator is configured to generate the larger current in the inner winding of the coil windings than the outer winding of the coil in the presence of one or more conductive surfaces positioned adjacent to the wireless charging device. ### Claim 34 (depends on 23) The wireless charging device of claim 23, wherein the outer winding is configured to limit Eddy current generation in one or more conductive surfaces positioned adjacent to the wireless charging device. ### Claim 35 A wireless charging device, comprising: a resonator including coil windings that include an inner winding having an inner coupling and an outer winding having an outer coupling, the resonator configured to generate a magnetic field; and a selectively configured feed connectable to: (a) the inner coupling and (b) the outer coupling, the feed being configured to connect to a power source to power the resonator, wherein: in a first mode of operation, the inner coupling are configured to connect to the feed to connect the inner coupling to the power source; and in a second mode of operation, the outer coupling are configured to connect to the feed to the power source. ### Claim 36 (depends on 35) The wireless charging device of claim 35, wherein: in the first mode of operation, the outer coupling is electrically closed; and in the second mode of operation, the inner coupling is electrically closed. ### Claim 37 (depends on 36) The wireless charging device of claim 36, wherein the resonator further comprises an inline capacitor, the outer coupling being electrically closed via the inline capacitor in the first mode of operation and the inner coupling being electrically closed via the inline capacitor in the second mode of operation. ### Claim 38 (depends on 35) The wireless charging device of claim 35, wherein, in a third mode of operation, the inner coupling and the outer coupling are configured to connect to the power source. ### Claim 39 (depends on 35) The wireless charging device of claim 35, wherein the feed is selectively connected based on one or more characteristics of the wireless charging device or an associated power receiving unit. ### Claim 40 (depends on 39) The wireless charging device of claim 39, wherein the one or more characteristics comprise: the current of the resonator, a voltage induced in the power receiving unit, and/or a mutual impedance between the wireless charging device and the power receiving unit. ### Claim 41 (depends on 35) The wireless charging device of claim 35, wherein the feed is selectively connected based on a control signal received by the wireless charging device. ### Claim 42 (depends on 35) The wireless charging device of claim 35, further comprising one or more tuning capacitors connected in series between the power source and the coil windings.