US 11,912,143 B2
Wireless power transfer
Afshin Partovi, Palo Alto, CA (US)
Assigned to Mojo Mobility Inc., Palo Alto, CA (US)
Filed by Mojo Mobility Inc., Palo Alto, CA (US)
Filed on Apr. 14, 2021, as Appl. No. 17/230,830.
Application 17/230,830 is a continuation of application No. 16/165,771, filed on Oct. 19, 2018, granted, now 11,005,285.
Application 16/165,771 is a continuation in part of application No. 13/829,346, filed on Mar. 14, 2013, granted, now 10,115,520.
Application 13/829,346 is a continuation in part of application No. 13/352,096, filed on Jan. 17, 2012, granted, now 9,178,369, issued on Nov. 3, 2015.
Prior Publication US 2021/0320532 A1, Oct. 14, 2021
Int. Cl. H02J 7/00 (2006.01); B60L 53/12 (2019.01); H02J 50/12 (2016.01); H02J 50/70 (2016.01); H01F 27/28 (2006.01); H02J 50/90 (2016.01); H04W 4/80 (2018.01); H04B 5/00 (2006.01); H01F 38/14 (2006.01); H01F 27/36 (2006.01); H02J 50/23 (2016.01)
CPC B60L 53/12 (2019.02) [H01F 27/288 (2013.01); H01F 27/2823 (2013.01); H01F 27/36 (2013.01); H01F 27/361 (2020.08); H01F 27/363 (2020.08); H01F 27/366 (2020.08); H01F 38/14 (2013.01); H02J 7/0013 (2013.01); H02J 7/0044 (2013.01); H02J 50/12 (2016.02); H02J 50/70 (2016.02); H02J 50/90 (2016.02); H04B 5/0031 (2013.01); H04B 5/0037 (2013.01); H04B 5/0087 (2013.01); H04W 4/80 (2018.02); H02J 50/23 (2016.02)] 19 Claims
OG exemplary drawing
 
1. A system for wireless charging comprising:
a charger including a charger coil comprising a copper material and having a substantially planar surface, a thin magnetic planar layer located under the charger coil, and a charger drive circuit including resonant capacitors to supply an alternating current to the charger coil;
a receiver unit including a receiver coil coupled to a receiver electronics including one or more resonant capacitors, a rectifier circuit, and smoothing capacitors wherein the receiver unit is coupled to a mobile device for providing power or charging the mobile device;
wherein the receiver coil is a solenoid comprising a ferrite core with a relative magnetic permeability exceeding 1, and with copper Litz wire wrapped around the ferrite core along a winding axis to form a wound wire section and with the ferrite core extending beyond the wound wire section along the winding axis and terminating in a first end and a second end with the distance between the first end and the second end defining the length of the solenoid; and
with the first end and the second end each having a smaller dimension in either axis of the end that is smaller than the length of the solenoid; and
wherein the charger coil is patterned in a spiral or similar shape defining a charger coil area wherein the charger coil area is larger than an area of the first end and an area of the second end; and
when the charger coil is driven by the charger drive circuit with the alternating current, an inductive magnetic field in a direction substantially perpendicular to the planar surface of the charger coil, at the surface of the charger coil at a center of the charger coil area is generated; and
wherein when the receiver coil is placed above and near the surface of the charger coil in a charging position, the magnetic flux from the charger coil is guided through the ferrite core of the receiver coil and returns to close a magnetic loop through the charger magnetic planar layer to transfer power to the receiver unit.