US 11,990,772 B2
Automatically-aligning magnetic field system
Brian R. Dearden, Pasadena, CA (US); and Justin Cheng-Tsu Loo, San Marino, CA (US)
Assigned to THE ALFRED E. MANN FOUNDATION FOR SCIENTIFIC RESEARCH, Valencia, CA (US)
Filed by The Alfred E. Mann Foundation for Scientific Research, Valencia, CA (US)
Filed on Nov. 2, 2021, as Appl. No. 17/517,518.
Claims priority of provisional application 63/109,476, filed on Nov. 4, 2020.
Prior Publication US 2022/0140664 A1, May 5, 2022
Int. Cl. H02J 50/90 (2016.01); A61N 1/378 (2006.01); H01F 38/14 (2006.01); H02J 50/00 (2016.01); H02J 50/10 (2016.01); H02J 50/40 (2016.01); H02J 50/80 (2016.01)
CPC H02J 50/90 (2016.02) [A61N 1/3787 (2013.01); H01F 38/14 (2013.01); H02J 50/005 (2020.01); H02J 50/10 (2016.02); H02J 50/402 (2020.01); H02J 50/80 (2016.02)] 24 Claims
OG exemplary drawing
 
1. A wireless power transfer system comprising a wireless power transfer device, the 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 cons; and
a driver configured to provide a first current to the first transmitting coil and a second current to the second transmitting coil to generate a magnetic field,
wherein the driver is configured to differentially drive the first and second transmitting coils, by independently controlling amplitudes of the first and second currents, to control a direction of the magnetic field,
wherein the first transmitting coil comprises a first rod and a first wire wound around the first rod,
wherein the second transmitting coil comprises a second rod and a second wire wound around the second rod,
wherein the first wire comprises a first sub-con at one end of the first rod and a second sub-coil at another end of the first rod and s aced a art from the first sub-coil, and
wherein the second wire comprises a third sub-coil at one end of the second rod and a fourth sub-con at another end of the second rod and spaced apart from the third sub-coil.