Wireless power transmission system, wireless power transmission apparatus and wireless power receiving apparatus therefor

1. A wireless power communication system, comprising:

a power transmission apparatus including a charging power supply circuit, a primary coil, and a primary core, wherein the primary core receives the primary coil and the charging power supply circuit is configured to supply a current to the primary coil; and

a power receiving apparatus including a battery unit, a secondary coil, and a secondary core having a width wider than a width of the primary core, wherein the secondary core receives the secondary coil which outputs a current generated by a magnetic field to charge the battery unit, wherein the magnetic field is induced by the primary coil to the secondary coil, wherein:

the primary core includes a primary middle protruding portion where the primary coil is wound, and primary edge protruding portions disposed at both sides of the primary middle protruding portion,

the secondary core includes a secondary middle protruding portion where the secondary coil is wound, and secondary edge protruding portions disposed at both sides of the secondary middle protruding portion, wherein the secondary edge protruding portions of the secondary core are formed to be protruded such that the secondary edge protruding portions surround parts of the primary edge protruding portions of the primary core, and

the width of the primary core is a distance between the outer lines of the primary edge protruding portions and the width of the secondary core is a distance between the outer lines of the secondary edge protruding portions.

2. The system according to claim 1 , wherein the primary middle protruding portion and the secondary middle protruding portions are disposed to be on a single straight line.

3. The system according to claim 2 , wherein two adjacent surfaces of the secondary edge protruding portion are disposed to face two adjacent surfaces of the primary edge protruding portion, respectively.

4. The system according to claim 2 , further comprising:

a primary housing receiving the primary core,

wherein the primary housing includes a protruded portion corresponding to the primary edge protruding portion.

5. The system according to claim 2 , further comprising:

a secondary housing receiving the secondary core,

wherein the secondary housing includes a recessed portion, into which the primary edge protruding portion is inserted.

6. The system according to claim 1 , wherein the secondary coil is configured to output a current transformed by a turns ratio of the primary coil and the secondary coil.

7. The system according to claim 1 , further comprising:

a driving mechanism for driving any one of the primary and secondary cores to move the one toward the other.

8. The system according to claim 7 , further comprising:

a sensor for sensing whether any one of the primary and secondary cores approaches to the other,

wherein the driving mechanism is driven based on a sensing result of the sensor.

9. A wireless power transmission apparatus, comprising:

a primary coil where a magnetic field is induced by an applied current such that an output current of a secondary coil is induced;

a primary core having a width narrower than a width of a secondary core where the secondary coil is wound, wherein the primary coil is wound to the primary core and the winding axis of the primary core, around which the primary coil is wound, is in line with the winding axis of the secondary core, around which the secondary coil is wound; and

a charging power supply circuit configured to supply the applied current to the primary coil, wherein:

the primary core includes a primary middle protruding portion where the primary coil is wound, and primary edge protruding portions disposed at both sides of the primary middle protruding portion,

the secondary core includes a secondary middle protruding portion where the secondary coil is wound, and secondary edge protruding portions disposed at both sides of the secondary middle protruding portion, wherein the secondary edge protruding portions of the secondary core are formed to be protruded such that the secondary edge protruding portions surround parts of the primary edge protruding portions of the primary core, and

the width of the primary core is a distance between the outer lines of the primary edge protruding portions and the width of the secondary core is a distance between the outer lines of the secondary edge protruding portions.

10. The wireless power transmission apparatus according to claim 9 , wherein the edge protruding portion of the primary core is much protruded than the middle protruding portion of the primary core.

11. The wireless power transmission apparatus according to claim 9 , further comprising:

a driving mechanism for driving the primary core such that the primary core moves toward the secondary core.

12. The wireless power transmission apparatus according to claim 11 , further comprising:

a sensor for sensing whether the secondary core is approached to the primary core,

wherein the driving mechanism is driven based on a sensing result of the sensor.

13. A wireless power receiving apparatus, comprising:

a secondary coil formed to output a current by a magnetic field induced by a current, which is applied to a primary coil;

a secondary core having a width wider than a width of a primary core where the primary coil is wound, wherein the secondary coil is wound to the secondary core and the winding axis of the secondary core, around which the secondary coil is wound, is in line with the winding axis of the secondary core, around which the primary coil is wound; and

a battery unit configured to be charged with the current output by the secondary coil, wherein:

the primary core includes a primary middle protruding portion where the primary coil is wound, and primary edge protruding portions disposed at both sides of the primary middle protruding portion,

the secondary core includes a secondary middle protruding portion where the secondary coil is wound, and secondary edge protruding portions disposed at both sides of the secondary middle protruding portion, wherein the secondary edge protruding portions of the secondary core are formed to be protruded such that the secondary edge protruding portions surround parts of the primary edge protruding portions of the primary core, and

the width of the primary core is a distance between the outer lines of the primary edge protruding portions and the width of the secondary core is a distance between the outer lines of the secondary edge protruding portions.

14. The wireless power receiving apparatus according to claim 13 , wherein the edge protruding portion of the secondary core is less protruded than the middle protruding portion of the secondary core.