Wireless charging transmitter and wireless charging system using the same
A wireless power transmitter is electromagnetically coupleable to a receiving coil of a wireless power receiver to provide power wirelessly and includes a substantially planar transmitting core. A transmitting coil has a plurality of windings and is disposed on a surface of the transmitting core. The transmitting core may extend beyond the transmitting coil in a planar direction.
1. A wireless power transmitter electromagnetically coupleable to a receiving coil of a wireless power receiver to provide power wirelessly, the wireless power transmitter comprising:
a transmitting core configured to be substantially planar; and
a transmitting coil comprising a plurality of windings and configured to be disposed on a surface of the transmitting core,
wherein the transmitting core is configured to extend beyond the transmitting coil in a planar direction by a length, wherein the length is less than a distance perpendicular from a virtual magnetic average line of the transmitting coil to a center point of the receiving coil.
2. The wireless power transmitter of claim 1 , wherein the transmitting core is selectively sized according to at least one of a distance, an angle, or a magnetic distance between the transmitting coil and the receiving coil in response to the receiving coil being positioned above the transmitting coil at a predetermined angle with the transmitting coil.
3. The wireless power transmitter of claim 1 , wherein the transmitting core comprises:
a body portion corresponding to a size of the transmitting coil and having the transmitting coil fixed to the body portion; and
an extension portion formed to extend from the body portion by a predetermined length equal to the length.
4. The wireless power transmitter of claim 3 , wherein the predetermined length of the extension portion is established according to a shortest distance from the transmitting coil to the receiving coil.
5. The wireless power transmitter of claim 3 , wherein the transmitting coil is wound in a plurality of layers, and
the predetermined length of the extension portion is shorter than a distance from half of an overall height of the transmitting coil to a center point of the receiving coil in a direction perpendicular with respect to the transmitting coil.
6. The wireless power transmitter of claim 3 , wherein the extension portion extends so that a distance from a virtual magnetic average line of the transmitting coil to a center point of the receiving coil in a direction perpendicular with respect to the virtual magnetic average line is substantially the same as a length from a center of a width of the transmitting coil to an end of the extension portion.
7. The wireless power transmitter of claim 1 , wherein the transmitting core is formed so that a distance from a virtual magnetic average line of the transmitting coil to a center point of the receiving coil in a direction perpendicular with respect to the virtual magnetic average line substantially corresponds to a radial length from a center of the transmitting coil to an end of the transmitting core.
8. The wireless power transmitter of claim 1 , wherein the transmitting coil is wound in a plurality of layers, and
the transmitting core is formed so that a length from a center of the transmitting coil to an end of the transmitting core is shorter than a distance from a virtual magnetic average line of the transmitting coil to a center point of the receiving coil in a direction perpendicular with respect to the virtual magnetic average line.
9. The wireless power transmitter of claim 1 , wherein the transmitting core is formed so that a length from a center of the transmitting coil to an end of the transmitting core is shorter than a distance from a virtual magnetic average line of the transmitting coil to a center point of the receiving coil in a direction perpendicular with respect to the virtual magnetic average line.
10. The wireless power transmitter of claim 1 , wherein the transmitting core is formed so that an angle formed by a center point of the receiving coil and an extended line of a virtual magnetic average line of the transmitting coil is less than 45°.
11. The wireless power transmitter of claim 1 , further comprising a housing comprising the transmitting coil and the transmitting core,
wherein the housing further comprises a marking portion indicating a mounting position of a portable apparatus comprising the wireless power receiver.
12. The wireless power transmitter of claim 11 , wherein the marking portion is marked so that the receiving coil is positioned above the transmitting coil.
13. The wireless power transmitter of claim 1 , wherein the transmitting core is plate shaped and the transmitting coil is affixed to an upper surface of the transmitting core.
14. A wireless power transmitter electromagnetically coupleable to a receiving coil of a wireless power receiver to provide power wirelessly, the wireless power transmitter comprising:
a transmitting core configured to be substantially planar; and
a transmitting coil comprising a plurality of windings and being disposed on a surface of the transmitting core,
wherein the transmitting core configured to extend beyond the transmitting coil in a planar direction,
wherein the transmitting core comprises:
a body portion corresponding to a size of the transmitting coil and having the transmitting coil fixed to the body portion; and
an extension portion formed to extend from the body portion by a predetermined length, and
wherein the predetermined length of the extension portion is shorter than a distance from a virtual magnetic average line of the transmitting coil to a center point of the receiving coil in a direction perpendicular with respect to the virtual magnetic average line.
15. A wireless charging system comprising:
a wireless power transmitter comprising a transmitting coil and a transmitting core on which the transmitting coil is disposed; and
a wireless power receiver comprising a receiving coil configured to form a predetermined nonzero angle with respect to the transmitting coil,
wherein the transmitting core is selectively sized according to at least one of the angle, a distance, or a magnetic distance between the receiving coil and the transmitting coil, and
wherein the transmitting core is configured to extend beyond the transmitting coil in a planar direction so that a distance perpendicular from a virtual magnetic average line of the transmitting coil to a center point of the receiving coil is substantially the same as a length from a center of a width of the transmitting coil to an end of the transmitting core.
16. The wireless charging system of claim 15 , wherein the transmitting core comprises:
a body portion corresponding to a size of the transmitting coil and having the transmitting coil fixed to the body portion; and
an extension portion formed to extend from the body portion by a predetermined length.
17. The wireless charging system of claim 16 , wherein the predetermined length of the extension portion is established according to a distance from the transmitting coil to the receiving coil.
18. The wireless charging system of claim 16 , wherein the extension portion extends so that a distance from a virtual magnetic average line of the transmitting coil to a center point of the receiving coil in a direction perpendicular with respect to the virtual magnetic average line is substantially the same as a length from a center of the transmitting coil to an end of the extension portion.
19. The wireless charging system of claim 15 , wherein the transmitting core is formed so that a distance from a virtual magnetic average line of the transmitting coil to a center point of the receiving coil in a direction perpendicular with respect to the virtual magnetic average line corresponds to a length from a center of the transmitting coil to an end of the transmitting core.
20. The wireless charging system of claim 15 , wherein the transmitting coil is wound in a plurality of layers, and
the transmitting core is formed so that a length from a center of the transmitting coil to an end of the transmitting core is shorter than a distance from a virtual magnetic average line of the transmitting coil to a center point of the receiving coil in a direction perpendicular with respect to the virtual magnetic average line.
21. The wireless charging system of claim 15 , wherein the transmitting core is formed so that a length from a center of the transmitting coil to an end of the transmitting core is shorter than a distance from a virtual magnetic average line of the transmitting coil to a center point of the receiving coil in a direction perpendicular with respect to the virtual magnetic average line.
22. The wireless charging system of claim 15 , wherein the transmitting core is formed so that an angle formed by a center point of the receiving coil and an extended line of a virtual magnetic average line of the transmitting coil is less than 45°.
23. The wireless charging system of claim 15 , wherein the transmitting coil and receiving coil are disposed substantially transverse one to another.