Wireless charging apparatus
A wireless charging apparatus is disclosed. The wireless charging apparatus includes a plurality of coil arrays disposed so as to partially overlap each other, and a shielding member disposed at one side of each of the coil arrays to block a leaked magnetic field. The coil arrays include a first coil array including a plurality of transmission coils disposed adjacent to each other, a second coil array including a smaller number of transmission coils than the first coil array and disposed under the first coil array, and a third coil array including the same number of transmission coils as the second coil array and disposed on the first coil array. As a result, it is possible to simultaneously charge a plurality of devices requiring different amounts of power.
1. A wireless charging apparatus comprising:
a plurality of coil arrays; and
a shielding member disposed adjacent to the coil arrays to block a leaked magnetic field,
wherein the coil arrays comprise:
a first coil array comprising a plurality of transmission coils disposed adjacent to each other;
a second coil array comprising a smaller number of transmission coils than the first coil array, the second coil array being disposed under the first coil array; and
a third coil array disposed on the first coil array,
wherein the second coil array comprises a first auxiliary transmission coil and a second auxiliary transmission coil disposed so as to be in contact with each other.
2. The wireless charging apparatus according to claim 1 , wherein the first coil array comprises a first main transmission coil to a ninth main transmission coil disposed adjacent to each other.
3. The wireless charging apparatus according to claim 2 , wherein the first to ninth main transmission coils are disposed in a form of a matrix having three rows and three columns.
4. The wireless charging apparatus according to claim 1 , wherein the shielding member comprises a recess formed therein, the recess extending in an upward-downward direction, and
wherein the first auxiliary transmission coil and the second auxiliary transmission coil are seated in the recess.
5. The wireless charging apparatus according to claim 1 , wherein the first auxiliary transmission coil and the second auxiliary transmission coil are disposed so as to be symmetric to each other with respect to a vertical center line of the shielding member.
6. The wireless charging apparatus according to claim 5 , wherein the third coil array comprises a third auxiliary transmission coil and a fourth auxiliary transmission coil disposed so as to be in contact with each other.
7. The wireless charging apparatus according to claim 6 , wherein the third auxiliary transmission coil and the fourth auxiliary transmission coil are disposed so as to be symmetric to each other with respect to a horizontal center line of the shielding member.
8. The wireless charging apparatus according to claim 1 , wherein each of the transmission coils included in each of the coil arrays is wound in a quadrangular shape.
9. The wireless charging apparatus according to claim 1 , further comprising:
a wireless power driver; and
a controller configured to control the wireless power driver to simultaneously transmit wireless power through the coil arrays.
10. The wireless charging apparatus according to claim 1 , further comprising:
a sensing unit configured to determine whether overheating of the wireless charging apparatus has occurred.
11. The wireless charging apparatus according to claim 10 , wherein the sensing unit measures a temperature of the shielding member to provide a measurement result to the controller.
12. The wireless charging apparatus according to claim 1 , wherein the first to third coil arrays are disposed to partially overlap in a central region of the first coil array.
13. The wireless charging apparatus according to claim 12 , wherein the wireless charging apparatus comprises:
a first power transmission region configured to transmit power of a first power intensity in the center region; and
a second power transmission region configured to transmit power of a second power intensity in a region adjacent to the central region, the second power intensity being less than the first power intensity.
14. The wireless charging apparatus according to claim 13 , wherein the wireless charging apparatus is configured to charge a first device in the first power transmission region, and to charge a second device in the second power transmission region.
15. The wireless charging apparatus according to claim 14 , wherein the wireless charge apparatus has a mode in which the first and second devices are simultaneously charged in the first and second power transmission regions respectively.
16. The wireless charging apparatus according to claim 1 , wherein the third coil array comprises a same number of transmission coils as the second coil array.
17. The wireless charging apparatus according to claim 1 , wherein the first, second and third coil arrays are disposed on the shielding member.
18. The wireless charging apparatus according to claim 1 , wherein the second or third coil array is aligned with a middle row or column of transmission coils in the first coil array.
19. The wireless charging apparatus according to claim 1 , wherein the third coil array is aligned with a middle column of transmission coils in the first coil array, and
wherein the second coil array is aligned with a middle row of transmission coils in the first coil array.