WIRELESS POWER TRANSMITTER
The present invention relates to a wireless power transmission technique and, more specifically, to a wireless power transmitter capable of improving the efficiency of wireless power transmission to improve the performance thereof. A wireless power transmitter according to an embodiment of the present invention comprises: a first transmission coil which includes a first area spaced apart from an interface surface at a first distance, and a second area spaced apart from the interface surface at a second distance; and a second transmission coil which overlaps the second area, wherein the first distance may be less than the second distance.
1 . A wireless power transmitter comprising:
a first transmission coil comprising a first region spaced a first distance from an interface surface and a second region spaced a second distance from the interface surface; and
a second transmission coil overlapping the second region,
wherein the first distance is less than the second distance.
2 . The wireless power transmitter according to claim 1 , wherein the first transmission coil has a shape bent toward the interface surface.
3 . The wireless power transmitter according to claim 1 , wherein an average distance between the first transmission coil and the interface surface decreases as a ratio of a horizontal length of the first region to a total horizontal length of the first transmission coil increases.
4 . The wireless power transmitter according to claim 1 , wherein an average distance between the first transmission coil and the interface surface decreases as a ratio of an area of the first region to a total area of the first transmission coil increases.
5 . The wireless power transmitter according to claim 1 , wherein a difference between the first distance and the second distance is a thickness of the first transmission coil.
6 . The wireless power transmitter according to claim 1 , further comprising:
a third transmission coil having a structure symmetrical to the first transmission coil.
7 . A wireless power transmitter comprising:
a first transmission coil comprising a first region spaced a first distance from an interface surface and a second region spaced a second distance from the interface surface; and
a second transmission coil overlapping the first region in a horizontal direction,
wherein the first distance is less than the second distance.
8 . The wireless power transmitter according to claim 7 , wherein the first transmission coil has a shape bent toward the interface surface.
9 . The wireless power transmitter according to claim 7 , wherein an average distance between the first transmission coil and the interface surface decreases as a ratio of a horizontal length of the first region to a total horizontal length of the first transmission coil increases.
10 . The wireless power transmitter according to claim 7 , wherein an average distance between the first transmission coil and the interface surface decreases as a ratio of an area of the first region to a total area of the first transmission coil increases.
11 . The wireless power transmitter according to claim 7 , wherein a difference between the first distance and the second distance is a thickness of the first transmission coil.
12 . The wireless power transmitter according to claim 7 , further comprising:
a third transmission coil having a structure symmetrical to the first transmission coil.