Wireless power transmission device and wireless power transmission system
Provided are a wireless power transmission device and a wireless power transmission system. The wireless power transmission device, according to one embodiment of the present invention, may comprise: a dipole coil comprising a core, and a conducting wire wound at the center part of the core; a power unit for supplying a current to the conducting wire; and a canceling coil for canceling a magnetic field radiated from a lateral surface of the dipole coil.
1. A wireless power transmission device, comprising:
a dipole coil comprising a core, and a conducting wire wound at the center part of the core;
a power unit for supplying a current to the conducting wire; and
a canceling coil for canceling a magnetic field radiated from a lateral surface of the dipole coil.
2. The wireless power transmission device as claimed in claim 1 , wherein the canceling coil comprises:
a first canceling coil which is disposed in a left area of the dipole coil; and
a second canceling coil which is disposed in a right area of the dipole coil.
3. The wireless power transmission device as claimed in claim 2 , wherein each of the first canceling coil and the second canceling coil has a shape that a rectangular closed line is bent twice in parallel.
4. The wireless power transmission device as claimed in claim 3 , wherein the first canceling coil includes a front surface of a ‘ 9 ’ shape with reference to the dipole coil, and an upper surface of a ‘[’ with reference to the dipole coil, and
wherein the second canceling coil includes a front surface of a ‘[’ shape with reference to the dipole coil, and an upper surface of a ‘]’ with reference to the dipole coil.
5. The wireless power transmission device as claimed in claim 2 , wherein a portion of a left side of the dipole coil is disposed inside the first canceling coil, and
wherein a portion of a right side of the dipole coil is disposed inside the second canceling coil.
6. The wireless power transmission device as claimed in claim 2 , wherein the canceling coil further comprises:
a plurality of third canceling coils of a rectangular closed line form which is disposed in parallel with a lateral surface of the dipole coil, between the first canceling coil and the second canceling coil.
7. The wireless power transmission device as claimed in claim 1 , wherein the canceling coil comprises:
a first canceling coil which is disposed in a front side area of the dipole coil; and
a second canceling coil which is disposed in a rear side area of the dipole coil,
wherein the first and second canceling coils have a dipole coil shape.
8. The wireless power transmission device as claimed in claim 7 , wherein each of the first canceling coil and the second canceling coil has any one shape from among a single integral-type dipole coil and a plurality of distribution-type dipole coils.
9. The wireless power transmission device as claimed in claim 1 , wherein the canceling coil is configured to:
generate an induced electromotive force by a magnetic field radiated from the dipole coil; and
radiate a canceling magnetic field to cancel a magnetic field radiated from the dipole coil based on the generated induced electromotive force.
10. The wireless power transmission device as claimed in claim 1 , further comprising:
a canceling power unit for supplying, to the canceling coil, a current to control the canceling coil to radiate a canceling magnetic field canceling a magnetic field radiated from the dipole coil.
11. The wireless power transmission device as claimed in claim 10 , wherein the canceling power unit is configured to supply, to the canceling coil, a current with a phase difference of 180 degrees from a current supplied from the power unit.
12. The wireless power transmission device as claimed in claim 1 , wherein the canceling coil has an impedance of an inductive load.
13. The wireless power transmission device as claimed in claim 1 , further comprising:
a metal plate which is disposed at a lower part or lateral surface of the dipole coil and cancels a magnetic field radiated from the lower part or lateral surface of the dipole coil.
14. The wireless power transmission device as claimed in claim 7 , further comprising:
a metal plate for canceling a magnetic field radiated from an upper part of the first canceling coil and the second canceling coil.
15. A wireless power transmission system, comprising:
a wireless power reception device; and
a wireless power transmission device, including:
a first dipole coil including a first core, and a first conducting wire wound at the center part of the first core; and
a canceling coil for canceling a magnetic field radiated from a direction other than a direction in which the wireless power reception device is disposed,
wherein the wireless power reception device includes a second coil for generating a current when a magnetic field radiated from the wireless power transmission device is applied.