Wireless power device having a first coil and a second coil
The invention relates to a wireless power device including a coil to wirelessly transmit or receive power. The coil has a meander pattern. And the quality factor can be increased by reducing the resistance component through the structure of the coil having the meander pattern. Also, the power transmission efficiency can be significantly improved by concentrating the intensity of the magnetic field on a predetermined part through the structure of the coil having the meander pattern.
1. A wireless power device comprising:
a first coil including a first sub-coil and a second sub-coil connected with the first sub-coil in parallel; and
a second coil connected with the first coil in parallel and including a first sub-coil and a second sub-coil connected with the first sub-coil in parallel,
wherein the first sub-coil of the first coil is connected with the first sub-coil of the second coil in parallel,
wherein the second sub-coil of the first coil is connected with the second sub-coil of the second coil in parallel,
wherein the first sub-coil of the second coil surrounds and is spaced apart from the first sub-coil of the first coil by a predetermined distance, and the second sub-coil of the second coil surrounds and is spaced apart from the second sub-coil of the first coil by the predetermined distance,
wherein the first sub-coil of the second coil and the first sub-coil of the first coil are arranged to be horizontally symmetrical with respect to the second sub-coil of the second coil and the second sub-coil of the first coil, and
wherein each coil has a meander pattern.
2. The wireless power device of claim 1 , wherein the first and second sub-coils of the first coil have a closed-loop structure.
3. The wireless power device of claim 1 , wherein the first and second sub-coils of the second coil have a closed-loop structure.
4. The wireless power device of claim 1 , wherein the second coil surrounds the first coil.
5. The wireless power device of claim 1 , wherein a curvature radius of the second coil is greater than a curvature radius of the first coil.
6. The wireless power device of claim 1 , wherein the first coil has a spacing equal to a spacing of the second coil.
7. The wireless power device of claim 1 , further comprising a capacitor connected with each of the coils to adjust a resonance frequency.