# US 2019/0379232 A1 · Wireless charging system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0379232 A1 - Document ID: US20190379232A1 - Status: Published application - Kind: A1 - Application number: 16/462,955 - Filed: 2017-11-22 - Published: 2019-12-12 - Earliest claimed: 2016-11-22 - Assignees: Cambridge Consultants Limited; Rostislav LEMDIASOV; Arun VENKATASUBRAMANIAN - Inventors: Rostislav LEMDIASOV; Arun VENKATASUBRAMANIAN - Web page: https://patentgrep.com/patent/US20190379232A1 ## CPC - H02J 50/12: of the resonant type - A61N 1/3787: {from an external energy source} - H02J 50/402: {the two or more transmitting or the two or more receiving devices being integrated in the same unit, e.g. power mats with several coils or antennas with several sub-antennas} - H02J 50/90: involving detection or optimisation of position, e.g. alignment - H04B 5/26: using coils - H04B 5/79: for data transfer in combination with power transfer - H02J 50/60: responsive to the presence of foreign objects, e.g. detection of living beings - H02J 2105/46: Medical devices, medical implants or life supporting devices - H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY - A61N: ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY (measurement of bioelectric currents A61B; surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body A61B18/00; anaesthetic apparatus in general A61M; incandescent lamps H01K; infrared radiators for heating H05B) - H04B: TRANSMISSION ## Abstract A wearable device for wirelessly charging a chargeable device, the wearable device comprising: means for generating a magnetic field for wirelessly charging the chargeable device, wherein the magnetic field generating means comprises at least two transmit coils, each configured to generate a respective component of the magnetic field; and means for shaping the magnetic field, in dependence on at least one of a location, orientation and shape of the chargeable device, by configuring the respective magnetic field component generated by each transmit coil, whereby to optimize the magnetic field for charging the chargeable device. ## Claims ### Claim 1 A wearable device for wirelessly charging a chargeable device, the wearable device comprising: means for generating a magnetic field for wirelessly charging the chargeable device, wherein the magnetic field generating means comprises at least two transmit coils, each configured to generate a respective component of the magnetic field; and means for shaping the magnetic field, in dependence on at least one of a location, orientation and shape of the chargeable device, by configuring the respective magnetic field component generated by each transmit coil, whereby to optimize the magnetic field for charging the chargeable device. ### Claim 2 (depends on 1) A wearable device according to claim 1, wherein the at least two transmit coils are mechanically coupled for movement relative to one another whereby to provide the wearable device with flexibility when worn by a user. ### Claim 3 (depends on 1) A wearable device according to claim 1, wherein adjacent transmit coils of the at least two transmit coils are each mechanically coupled to one another, for movement into a plurality of different respective positions relative to one another, to select a position in which, during operation, the adjacent transmit coils are magnetically decoupled from one another, or magnetic coupling (or mutual inductance) between the adjacent coils is minimized. ### Claim 4 (depends on 1) A wearable device according to claim 1, wherein adjacent transmit coils of the at least two transmit coils are mechanically coupled to one another with a coupling configured for rotational movement of at least one of the adjacent coils about an axis and for translational movement of at least one of the adjacent coils relative to the other coil. ### Claim 5 (depends on 4) A wearable device according to claim 4, wherein said coupling is configured for controlling an overlap between the adjacent transmit coils, at a given angle, whereby to reduce or minimize magnetic coupling (or mutual inductance) between the adjacent coils. ### Claim 6 (depends on 1) A wearable device according to claim 1, wherein the magnetic field shaping means comprises means for controlling a phase difference between respective voltage signals applied to each of the at least two transmit coils. ### Claim 7 (depends on 1) A wearable device according to claim 1, wherein the magnetic field shaping means is configured to control a voltage signal applied to each of the at least two transmit coils based on at least one impedance determined for that transmit coil. ### Claim 8 (depends on 7) A wearable device according to claim 7, wherein the at least one impedance determined for a given transmit coil comprises a respective impedance determined as each other of the at least two transmit coils is energized independently. ### Claim 9 (depends on 8) A wearable device according to claim 8, wherein the respective impedance determined as each other of the at least two transmit coils is energized independently is determined based on a mutual inductance between the given transmit coil and the transmit coil that is being energized independently. ### Claim 10 (depends on 1) A wearable device according to claim 1, wherein the wearable device is configured to be worn around the body of a user. ### Claim 11 (depends on 1) A wearable device according to claim 1, wherein the wearable device is configured as a belt, skirt, shirt or jacket. ### Claim 12 (depends on 1) A wearable device according to claim 1, wherein the magnetic field shaping means is operable to configure the respective magnetic field component generated by each coil to shape the magnetic field generated by the generating means whereby to optimize the magnetic field for charging a chargeable device that is implanted in a body of a user. ### Claim 13 (depends on 1) A wearable device according to claim 1, wherein the magnetic field shaping means is operable to configure the respective magnetic field component generated by each coil to shape the magnetic field generated by the generating means whereby to optimize the magnetic field for charging a chargeable device that is not implanted in a body of a user (e.g. a device that is worn on a body of a user). ### Claim 14 (depends on 1) A wearable device according to claim 1, wherein the magnetic field shaping means is operable to configure the respective magnetic field component generated by each coil to shape the magnetic field generated by the generating means away from an object other than the chargeable device. ### Claim 15 (depends on 14) A wearable device according to claim 14, wherein the object other than the chargeable device is capable of magnetically coupling with one or more of the at least two transmit coils. ### Claim 16 A device for wirelessly charging a chargeable device the wearable device comprising: means for generating a magnetic field for wirelessly charging the chargeable device, wherein the magnetic field generating means comprises at least two transmit coils, each configured to generate a respective component of the magnetic field; and wherein adjacent transmit coils of the at least two transmit coils are each mechanically coupled to one another, for movement into a plurality of different respective positions relative to one another, to select a position in which, during operation, the adjacent transmit coils are magnetically decoupled from one another, or magnetic coupling between the adjacent coils is minimized. ### Claim 17 A method for calibrating an apparatus for charging a chargeable device, the apparatus comprising at least two transmit coils, the method comprising: (i) supplying current to energize a given transmit coil of the at least two transmit coils and determining an impedance of each other of the at least two transmit coils while current is supplied to the given transmit coil; (ii) repeating step (i) using each of the at least two transmit coils, in turn, as the given transmit coil; (iii) determining a voltage signal to be applied to each of the at least two transmit coils, based on the impedances determined in steps (i) and (ii); (iv) applying the voltage signals determined in step (iii) to the corresponding transmit coils. ### Claim 18 (depends on 17) A method according to claim 17, wherein determining a voltage signal in step (iii) comprises at least one of: determining a phase difference to be applied between respective voltage signals applied to each transmit coil; and determining a respective voltage amplitude of the voltage signals to be applied at each transmit coil. ### Claim 19 (depends on 17) A computer program product for calibrating an apparatus for charging a chargeable device, the apparatus comprising at least two transmit coils, the computer program product comprising instructions for causing a computer-programmable device to perform a method according to claim 17.