Wireless power transmission apparatus
A wireless power transmission apparatus can include a coil unit including a first layer including a first wireless power transmission coil having an asymmetric shape, and a second layer including a second wireless power transmission coil having an asymmetric shape, the first and second wireless power transmission coils being connected in parallel and partially overlapping with each other; and first and second terminals configured to simultaneously apply current to the first and second wireless power transmission coils connected in parallel, in which the first wireless power transmission coil and the second wireless power transmission coil have line symmetry with respect to an imaginary line extending between the first and second terminals and between the first and second layers.
1. A wireless power transmission apparatus comprising:
a coil unit including:
a first layer including a first wireless power transmission coil having an asymmetric shape, and
a second layer including a second wireless power transmission coil having an asymmetric shape, the first and second wireless power transmission coils being connected in parallel and partially overlapping with each other; and
first and second terminals configured to simultaneously apply current to the first and second wireless power transmission coils connected in parallel,
wherein the first wireless power transmission coil and the second wireless power transmission coil have line symmetry with respect to an imaginary line extending between the first and second terminals and between the first and second layers,
wherein the first wireless power transmission coil includes a first rounded inner coil part and a second rounded inner coil part disposed on opposite sides of the imaginary line, the second rounded inner coil part of the first wireless power transmission coil being smaller than the first rounded inner coil part of the first wireless power transmission coil,
wherein the second wireless power transmission coil includes a first rounded inner coil part and a second rounded inner coil part disposed on opposite sides of the imaginary line, the second rounded inner coil part of the second wireless power transmission coil being smaller than the first rounded inner coil part of the second wireless power transmission coil, and
wherein the first rounded inner coil part of the first wireless power transmission coil and the first rounded inner coil part of the second wireless power transmission coil are disposed on opposite sides of the imaginary line, or the second rounded inner coil part of the first wireless power transmission coil and the second rounded inner coil part of the second wireless power transmission coil are disposed on opposite sides of the imaginary line.
2. The wireless power transmission apparatus according to claim 1 , wherein the first wireless power transmission coil and the second wireless power transmission coil have different shapes.
3. The wireless power transmission apparatus according to claim 2 , wherein the imaginary line defining the line symmetry between the first and second wireless power transmission coils is located equidistant between the first and second layers.
4. The wireless power transmission apparatus according to claim 2 , wherein the imaginary line defining the line symmetry between the first and second wireless power transmission coils is located equidistant between the first and second terminals.
5. The wireless power transmission apparatus according to claim 2 , wherein the imaginary line defining the line symmetry between the first and second wireless power transmission coils is located equidistant between a center point of the first wireless power transmission coil and a center point of the second wireless power transmission coil.
6. The wireless power transmission apparatus according to claim 1 , wherein the first and second terminals have line symmetry with respect to the imaginary line.
7. The wireless power transmission apparatus according to claim 1 , wherein each of the first and second wireless power transmission coils have multiple bends.
8. The wireless power transmission apparatus according to claim 1 , wherein each of the first and second wireless power transmission coils includes at least one 90 degree bend.
9. The wireless power transmission apparatus according to claim 1 , wherein the first and second wireless power transmission coils are configured to provide a magnetic field.
10. The wireless power transmission apparatus according to claim 9 , wherein the magnetic field is substantially uniform in an area over the coil unit.
11. The wireless power transmission apparatus according to claim 1 , wherein the first wireless power transmission coil includes at least one 90 degree bend between the first rounded inner coil part of the first wireless power transmission coil and the second rounded inner coil part of the first wireless power transmission coil.
12. The wireless power transmission apparatus according to claim 1 , wherein the second wireless power transmission coil includes at least one 90 degree bend between the first rounded inner coil part of the second wireless power transmission coil and the second rounded inner coil part of the second wireless power transmission coil.
13. The wireless power transmission apparatus according to claim 1 , wherein the first wireless power transmission coil includes a diagonal segment relative to the imaginary line, the diagonal segment being disposed between the first rounded inner coil part of the first wireless power transmission coil and the second rounded inner coil part of the first wireless power transmission coil.
14. The wireless power transmission apparatus according to claim 1 , wherein the second wireless power transmission coil includes a diagonal segment relative to the imaginary line, the diagonal segment being disposed between the first rounded inner coil part of the second wireless power transmission coil and the second rounded inner coil part of the second wireless power transmission coil.