# US 2024/0204582 A1 · Automatically-aligning magnetic field system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2024/0204582 A1 - Document ID: US20240204582A1 - Status: Published application - Kind: A1 - Application number: 18/593,602 - Filed: 2024-03-01 - Published: 2024-06-20 - Earliest claimed: 2020-11-04 - Assignees: Alfred E. Mann Foundation for Scientific Research - Applicants: The Alfred E. Mann Foundation for Scientific Research - Inventors: Brian R. Dearden; Justin Cheng-Tsu Loo - Web page: https://patentgrep.com/patent/US20240204582A1 ## CPC - H02J 50/70: involving the reduction of electric, magnetic or electromagnetic leakage fields - H02J 50/90: involving detection or optimisation of position, e.g. alignment - A61N 1/3787: {from an external energy source} - H01F 38/14: Inductive couplings - H02J 50/005: {Mechanical details of housing or structure aiming to accommodate the power transfer means, e.g. mechanical integration of coils, antennas or transducers into emitting or receiving devices} - H02J 50/10: using inductive coupling - 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 50/80: 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 - 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) - H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES ## Abstract A wireless power transfer device includes a first transmitting coil oriented along a first axis; a second transmitting coil on the first transmitting coil and oriented along a second axis different from the first axis; a nonmagnetic material magnetically decoupling the first transmitting coil from the second transmitting coil in an area of overlap between the first and second transmitting coils; and a driver configured to separately provide first and second currents to the first and second transmitting coils, respectively, to generate a magnetic field. ## Claims ### Claim 1 A wireless power transfer device comprising: a first transmitting coil oriented along a first axis; a second transmitting coil on the first transmitting coil and oriented along a second axis different from the first axis; a nonmagnetic material magnetically decoupling the first transmitting coil from the second transmitting coil in an area of overlap between the first and second transmitting coils; and a driver configured to separately provide first and second currents to the first and second transmitting coils, respectively, to generate a magnetic field. ### Claim 2 (depends on 1) The wireless power transfer device of claim 1, wherein the wireless power transfer device comprises a controller configured to separately control respective amplitudes of the first and second currents provided by the driver. ### Claim 3 (depends on 2) The wireless power transfer device of claim 2, wherein the driver comprises first and second drivers respectively coupled to the first and second transmitting coils, wherein the wireless power transfer device comprises first and second power modulation electronics respectively configured to receive first and second bus voltages and to respectively provide power to the first and second drivers, wherein the controller is configured to separately control the first and second bus voltages. ### Claim 4 (depends on 2) The wireless power transfer device of claim 2, wherein the controller is configured to control a phase difference between the first and second currents provided by the driver. ### Claim 5 (depends on 2) The wireless power transfer device of claim 2, wherein the wireless power transfer device comprises a receiver configured to receive a wireless signal, and wherein the controller is configured to separately control the respective amplitudes of the first and second currents based on information of the wireless signal. ### Claim 6 (depends on 1) The wireless power transfer device of claim 1, wherein the first transmitting coil comprises a first rod and a first wire wrapped around the first rod, the first rod comprising a magnetic material, and wherein the second transmitting coil comprises a second rod and a second wire wrapped around the second rod, the second rod comprising a magnetic material. ### Claim 7 (depends on 6) The wireless power transfer device of claim 6, wherein the first rod comprises a first main rod extending along the first axis and a first flange protruding from an end of the first main rod along a direction perpendicular to both the first and second axes and toward the second transmitting coil, and wherein the second rod comprises a second main rod extending along the second axis and a second flange protruding from an end of the second main rod along a direction perpendicular to both the first and second axes and toward the first transmitting coil. ### Claim 8 (depends on 6) The wireless power transfer device of claim 6, wherein the first rod is recessed at the area of overlap and in a side facing the second transmitting coil, and wherein the second rod is recessed at the area of overlap and in a side facing the first transmitting coil. ### Claim 9 (depends on 1) The wireless power transfer device of claim 1, wherein the nonmagnetic material is a solid nonmagnetic material. ### Claim 10 (depends on 1) A wireless power transfer system, comprising: the wireless power transfer system of claim 1; and an electronic device comprising a receiver coil. ### Claim 11 (depends on 10) The wireless power transfer system of claim 10, wherein the electronic device is an implantable medical device. ### Claim 12 (depends on 10) The wireless power transfer system of claim 10, wherein the electronic device further comprises: a detector configured to detect information about power received in the receiver coil; and a transmitter configured to transmit the information to the wireless power transfer device. ### Claim 13 A method of transmitting power to an electronic device, the method comprising: generating a magnetic field by separately driving, with AC current provided by a driver: a first transmitting coil of a wireless power transfer device oriented along a first axis, and a second transmitting coil of the wireless power transfer device on the first transmitting coil and oriented along a second axis different from the first axis, a nonmagnetic material magnetically decoupling the second transmitting coil from the first transmitting coil being in an area of overlap between the first and second transmitting coils. ### Claim 14 (depends on 13) The method of claim 13, comprising separately controlling, by a controller of the wireless power transfer device, respective amplitudes of first and second currents provided by the driver to the first and second transmitting coils. ### Claim 15 (depends on 14) The method of claim 14, comprising receiving, by a receiver of the wireless power transfer device, a wireless signal, wherein the controller separately controls the respective amplitudes of the first and second currents based on information of the wireless signal. ### Claim 16 (depends on 13) The method of claim 13, comprising: driving, by the driver and during a first time period, the first and second transmitting coils in phase; and driving, by the driver and during a second time period, the first and second transmitting coils 180 degrees out of phase. ### Claim 17 (depends on 13) The method of claim 13, wherein the electronic device is an implantable medical device. ### Claim 18 (depends on 13) The method of claim 13, comprising: generating an initial magnetic field and rotating a direction of the initial magnetic field at a receiver coil of the electronic device by: driving, with a first current, the first transmitting coil over a range of amplitudes of the first current, and driving, with a second current, the second transmitting coil over a range of amplitudes of the second current; and determining a combination of a first amplitude of the first current and a second amplitude of the second current that aligns the direction of the initial magnetic field at the receiver coil. ### Claim 19 (depends on 18) The method of claim 18, wherein the determining of the combination comprises: detecting a range of currents generated in the receiver coil during the rotating; and determining that the first amplitude and the second amplitude correspond to a maximum current in the detected range of currents, and wherein the generating of the magnetic field comprises, after the determining of the combination: driving the first transmitting coil with current having the first amplitude; and driving the second transmitting coil with current having the second amplitude. ### Claim 20 A wireless power transfer device, comprising: a first transmitting coil oriented along a first axis; a second transmitting coil above the first transmitting coil, overlapping the first transmitting coil, oriented along a second axis crossing the first axis, and magnetically decoupled from the first transmitting coil; a driver configured to separately provide first and second currents to the first and second transmitting coils, respectively, to generate a magnetic field.