# US 11,444,494 B2 · Systems, devices and methods for electrical and/or electronic interconnection > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,444,494 B2 - Document ID: US11444494B2 - Status: Granted - Kind: B2 - Application number: 16/704,563 - Filed: 2019-12-05 - Published: 2020-04-09 - Granted: 2022-09-13 - Earliest claimed: 2017-06-08 - Assignees: Fossil Group, Inc. - Applicants: Fossil Group, Inc. - Inventors: Brad Piercey - Web page: https://patentgrep.com/patent/US11444494B2 ## CPC - H02J 50/12: of the resonant type - H02J 50/10: using inductive coupling - H02J 50/80: involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices - H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY ## Abstract A wireless charging system includes an electrical and/or electronic interconnect as first connector. The transmitter electronics are included in the first connector. The first connector is electrically connected to a second connector via a cable. The second connector includes a transmitter coil. The first connector, cable, and the second connector are form the transmitter portion of the wireless charging system. Information from a receiver is obtained by the first connector which demodulates and processes the information and based on the request from the receiver changes the impedance and switching frequency of a tank circuit of the transmitter coil. Efficiency of the wireless charging system is optimized while reducing the form factor. ## Claims ### Claim 1 A device, comprising: a first connector including a Universal Serial Bus (USB) plug integrally formed with a first housing that houses a controller circuit, a field-effect transistor, and a wave filter, wherein the controller circuit is configured to send signals to the field-effect transistor and to receive filtered signals from the wave filter; and a second connector communicably coupled to the first connector via a cable, the second connector including a second housing that houses a tank circuit including a first transformer coil, the controller circuit configured to vary at least one of a switching frequency and impedance of the tank circuit, the first transformer coil configured to magnetically couple to a second transformer coil of a user device based on the at least one of the switching frequency and the impedance, wherein the first transformer coil is configured to power the user device based on the magnetic coupling. ### Claim 2 (depends on 1) The device of claim 1, wherein the controller circuit is further configured to receive a packet of data, the packet of data representing a request to vary power of transmission between the first transformer coil and the second transformer coil of the user device, the first circuit configured to vary at least one of the switching frequency and the impedance based on the packet of data. ### Claim 3 (depends on 2) The device of claim 2, wherein the controller circuit is further configured to digitally demodulate the packet of data and, in response to demodulating the packet of data, to vary the switching frequency based on the request. ### Claim 4 (depends on 1) The device of claim 1, wherein the second connector is configured for removably coupling to the user device. ### Claim 5 (depends on 1) The device of claim 1, wherein the controller circuit, the field-effect transistor, and the wave filter are mounted on a Printed Circuit Board (PCB) via Surface Mount Technology (SMT), the PCB being attached to and extending from the USB plug. ### Claim 6 (depends on 1) The device of claim 1, wherein the magnetic coupling between the first transformer coil and the second transformer coil powers the user device. ### Claim 7 (depends on 1) The device of claim 1, wherein the first connector includes a visual indicator to represent a charging state of the user device. ### Claim 8 (depends on 7) The device of claim 7, wherein the visual indicator includes a light pipe. ### Claim 9 A wireless charging system, comprising: a user device; and a device, comprising: a first connector including a Universal Serial Bus (USB) plug integrally formed with a first housing that houses a controller circuit, a field-effect transistor, and a wave filter, wherein the controller circuit is configured to send signals to the field-effect transistor and to receive filtered signals from the wave filter; and a second connector communicably coupled to the first connector via a cable, the second connector including a second housing that houses a tank circuit including a first transformer coil, the controller circuit configured to vary at least one of a switching frequency and impedance of the tank circuit, the first transformer coil configured to magnetically couple to a second transformer coil of the user device based on the at least one of the switching frequency and the impedance, wherein the first transformer coil is configured to power the user device based on the magnetic coupling. ### Claim 10 (depends on 9) The wireless charging system of claim 9, including: a transmitter portion configured to transform electric power from a power supply to alternating current within the first transformer coil; and a receiver portion configured to convert alternating current within the second transformer coil to direct current to charge the user device. ### Claim 11 (depends on 10) The wireless charging system of claim 10, wherein the transmitter portion includes the device, and the receiver portion includes the user device. ### Claim 12 A method, comprising: varying, via a controller circuit, at least one of switching frequency and impedance of a tank circuit, the controller circuit integrally formed with a first connector including a Universal Serial Bus (USB) plug and being disposed in a first housing that houses a field-effect transistor, and a wave filter, wherein the controller circuit is configured to send signals to the field-effect transistor and to receive filtered signals from the wave filter, the first connector being communicably coupled to a second connector via a cable, the second connector including the tank circuit including a first transformer coil; magnetically coupling the first transformer coil and a second transformer coil of a user device based on the at least one of the switching frequency and the impedance; and powering, the user device, based on the magnetic coupling between the first transformer coil and the second transformer coil. ### Claim 13 (depends on 12) The method of claim 12, further comprising: obtaining, at the controller circuit, a packet of data representing a request to vary power of transmission between the first transformer coil and the second transformer coil of the user device, the varying the at least one of the switching frequency and the impedance being based on the request. ### Claim 14 (depends on 13) The method of claim 13, further comprising: demodulating, at the controller circuit, the packet of data; and varying, at the controller circuit, power of transmission between the first transformer coil and the second transformer coil of the user device based on the request. ### Claim 15 (depends on 14) The method of claim 14, wherein varying the at least one the switching frequency and the impedance of the tank circuit includes: in response to demodulating the packet of data, decreasing the impedance of the tank circuit; and lowering the switching frequency based on the impedance, wherein the packet of data represents a request to increase the power. ### Claim 16 (depends on 14) The method of claim 14, wherein varying the at least one the switching frequency and the impedance of the tank circuit includes: in response to demodulating the packet of data, increasing the impedance of the tank circuit; and increasing the switching frequency based on the impedance, wherein the packet of data represents a request to decrease the power. ### Claim 17 (depends on 12) The method of claim 12, wherein the second connector is configured for removably coupling to the user device. ### Claim 18 (depends on 12) The method of claim 12, wherein the user device includes the second transformer coil. ### Claim 19 (depends on 12) The method of claim 12, wherein the first connector includes a visual indicator, the method further comprising: providing a first visual indication of incomplete charge of the user device via the visual indicator while charging the user device; and providing a second visual indication of fully-charged user device via the visual indicator when the user device is fully-charged. ### Claim 20 (depends on 12) The method of claim 12, wherein the second connector has a diameter of 26 mm and a thickness of 4.5 mm. ### Claim 21 (depends on 12) The method of claim 12, wherein the first transmitter coil includes 20 strands of 0.1 mm diameter Litz wire.