Patent ID: 11912143
Assignee: MOJO MOBILITY, INC.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC B  H  Y | IPC B  H

Claim 0:
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.