Magnetic coupler for wireless power transfer

A magnetic coupler, comprising:

• a transmitter for emitting a magnetic field, comprising:
• a first plate made of a magnetic material;
• a first primary coil and a second primary coil arranged on a surface of the first plate, wherein the first primary coil and the second primary coil are disposed within a periphery of the surface, and wherein a first portion of the first primary coil overlaps a first portion of the second primary coil;
• and
• a third primary coil, wherein a portion of the third primary coil overlaps with at least one of a second portion of the first primary coil or a second portion of the second primary coil, and wherein the third primary coil is disposed within the periphery of the surface of the plate;
• wherein the plate, the first primary coil, the second primary coil, and the third primary coil are round;
• a center of the first primary coil, a center of the second primary coil, and a center of the third primary coil are located on a circle centered at a center of the plate;
• the center of the first primary coil, the center of the second primary coil, and the center of the third primary coil are spaced apart from each other on the circle by equal angles;
• and
• the first primary coil, the second coil, and the third primary coil are configured to generate magnetic flux in the same direction;
• and
• a receiver for receiving the magnetic field, comprising:
• a second plate made of the magnetic material;
• and
• a first secondary coil arranged on a surface of the second plate, wherein the first secondary coil is disposed within a periphery of the surface of the second plate, and wherein the magnetic field is between the surface of the first plate and the surface of the second plate.

A magnetic coupler, comprising:

• a transmitter for emitting a magnetic field, comprising:
• a first plate made of a magnetic material;
• primary coils arranged on a surface of the first plate, wherein the primary coils are disposed within a periphery of the surface of the first plate, wherein each of the primary coils overlaps at least one portion of each of the other primary coils, and wherein each of the primary coils is arranged at a different height with respect to the first plate;
• and
• wherein the plate and the primary coils are round;
• a center of each of the primary coils is located on a circle centered at a center of the plate;
• the center of each of the primary coils is spaced apart from the centers of a preceding primary coil and a succeeding primary coil on the circle by equal angles;
• and
• the primary coils are configured to generate magnetic flux in the same direction;
• and
• a receiver for receiving the magnetic field, comprising:
• a second plate made of the magnetic material;
• and
• a secondary coil arranged on a surface of the second plate, wherein the secondary coil is disposed within a periphery of the surface of the second plate, and wherein the magnetic field is between the surface of the first plate and the surface of the second plate.