Core assembly for wireless power communication, power supplying device for wireless power communication having the same, and method for manufacturing the same

1. A core assembly for wireless power communication comprising:

a plate shaped core comprising concave parts disposed in a main surface thereof and made of a magnetic material; and

a plurality of winding type coils received in the concave parts and partially overlapping each other,

wherein the concave parts comprise:

a first concave part formed at a first depth; and

a second concave part formed to be in communication with the first concave part and having a second depth shallower than the first depth,

wherein the first concave part receives a first coil and the second concave part receives a second coil.

2. The core assembly for wireless power communication of claim 1 , wherein the concave parts have a contour in the shape of a closed curve, and

the first and second concave parts are recessed in a form in which two small closed curves inscribed in the contour of the concave parts partially overlap each other.

3. The core assembly for wireless power communication of claim 2 , wherein portions at which the small closed curves partially overlap each other are recessed at the first depth.

4. The core assembly for wireless power communication of claim 2 , wherein the closed curve of the contour of the concave parts has an oval shape.

5. The core assembly for wireless power communication of claim 1 , wherein the concave parts comprise a bottom and a sidewall, and

the concave parts are recessed at a size allowing an outer circumference entirely formed by the plurality of coils overlapping each other to contact the sidewall.

6. The core assembly for wireless power communication of claim 1 , wherein at least one of the coils is wound in an oval shape.

7. The core assembly for wireless power communication of claim 6 , wherein at least one of the plurality of coils is wound so as to have the same size as at least one other of the plurality of coils.

8. The core assembly for wireless power communication of claim 1 , wherein the core comprises at least one support protruding therefrom and inserted into a hollow part of the coil.

9. The core assembly for wireless power communication of claim 8 , wherein at least one section of a cross section of the support has a curved shape so as to fit a portion of an inner circumferential surface of the hollow part of the coil.

10. The core assembly for wireless power communication of claim 9 , wherein the core comprises a plurality of first through-holes through which both ends of each of the coils penetrate,

the core assembly further comprising a circuit board connected to both ends of each of each of the coils and configured to control application of a power to the coils, the circuit board comprising a plurality of second through-holes corresponding to the plurality of first through-holes.

11. The core assembly for wireless power communication of claim 10 , wherein the plurality of first through-holes comprise at least one pair of through-holes symmetrical to each other with respect to the center of the core.

12. The core assembly for wireless power communication of claim 10 , wherein a surface of the circuit board, opposite to another surface thereof facing the core, comprises a plurality of connection parts which are connected to both ends of each of the coils, the number of connection parts corresponding to the number of ends.

13. The core assembly for wireless power communication of claim 1 , wherein the concave parts comprise grooves, formed in a lower surface of the concave parts, in a direction in which the coils are wound, the grooves configured to receive portions of the coils contacting the lower surface of the concave parts.

14. A power supplying device for wireless power communication comprising:

the core assembly for wireless power communication of claim 1 , further comprising a circuit board connected to both ends of each of the coils and configured to control application of a power to the coils, and a charging power supplying circuit disposed on the circuit board; and

a housing which encloses the core assembly.

15. The power supplying device for wireless power communication of claim 14 , wherein the circuit board comprises a charging power supplying circuit.

16. The power supplying device for wireless power communication of claim 15 , wherein the charging power supplying circuit comprises:

a driving circuit configured to drive the operation of the coils;

a rectifier configured to convert an AC power to a DC power and supply the DC power to the driving circuit;

a wireless receiving module configured to receive signals from a power receiving device; and

a controller configured to change or maintain a driving mode of the driving circuit based on the signal received by the wireless receiving module.

17. The core assembly for wireless power communication of claim 1 , wherein the magnetic material of the plate shaped core comprises a mixture of manganese and zinc.

18. The core assembly for wireless power communication of claim 1 , further comprising a circuit board connected to both ends of each of the coils and configured to control application of a power to the coils.

19. The core assembly for wireless power communication of claim 1 , wherein one or more of the coils is wound in the shape of an ellipse or circle.