ANTENNA FOR WIRELESS POWER TRANSMISSION

• US 20180174746A1
• Filed: 12/19/2017
• Published: 06/21/2018
• Est. Priority Date: 12/20/2016
• Status: Active Grant

• Current Assignee: Amotech Co., Ltd.
• Original Assignee: Amotech Co., Ltd.
• Inventors: RYU, Kyung Hyun, BAEK, Hyung Il, SEOK, Wong Jin, JO, Yong Gil
• Granted Patent: US 10,504,648 B2
• Time in Patent Office: Days
• CPC Class Codes: H01F 27/28 Coils; Windings; Conductive connections
• CPC Class Codes: H01F 27/38 Auxiliary core members; Auxiliary coils or windings
• CPC Class Codes: H01F 38/14 Inductive couplings for wireless supply or distribution of electric power using inductive coupling H02J50/10
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H04B 5/0037 for power transfer
• CPC Class Codes: H04B 5/79 for data transfer in combination with power transfer

Abstract

An antenna for wireless power transmission. A first coil portion includes a first outer coil portion and a first inner coil portion. A second coil portion includes a second outer coil portion and a second inner coil portion. The first coil portion and the second coil portion are disposed to overlap and intersect each other at one or more points. In a state in which the first coil portion and the second coil portion are overlapped, bends of the first coil portion and the second coil portion overlap and intersect each other. All of the bends of the first outer coil portion are located above the bends of the second outer coil portion or all of the bends of the second outer coil portion are located above the bends of the first outer coil portion. Uniform charging efficiency is obtained across entire areas.

Claims

1. An antenna for wireless power transmission comprising:

a first coil portion comprising a first outer coil portion and a first inner coil portion; and

a second coil portion comprising a second outer coil portion and a second inner coil portion, wherein the first coil portion and the second coil portion overlap and intersect each other at one or more points,

wherein, bends of the first coil portion and the second coil portion overlap and intersect each other, all of the bends of the first outer coil portion are located above the bends of the second outer coil portion or all of the bends of the second outer coil portion are located above the bends of the first outer coil portion.

2. The antenna of claim 1, wherein each of the first inner coil portion and the second inner coil portion comprises an inner bend, and

wherein the inner bend of the first inner coil portion is located above the inner bend of the second inner coil portion or the inner bend of the second inner coil portion is located above the inner bend of the first inner coil portion.

3. The antenna of claim 1, wherein the first coil portion further comprises a first end portion of the first coil portion connected to the first outer coil portion and a second end portion of the first coil portion connected to the first inner coil portion,

the second coil portion further comprises a first end portion of the second coil portion connected to the second outer coil portion and a second end portion of the second coil portion connected to the second inner coil portion,

a coil connecting the second end portion of the first coil portion and the first inner coil portion is disposed to pass below the first outer coil portion and above the second outer coil portion, and

a coil connecting the second end portion of the second coil portion and the second inner coil portion is disposed to pass above coils of the first outer coil portion and the second outer coil portion.

4. The antenna of claim 1, wherein each of the first outer coil portion and the second outer coil portion have a spiral structure comprised of concentric double rectangles having different sizes.

5. The antenna of claim 4, wherein the vertices of the rectangles of the spiral structure are curved.

6. The antenna of claim 1, wherein a spacing of coils of the first outer coil portion and the second outer coil portion is 1.5 to 2.5 times a cross-sectional diameter of the coils.

7. The antenna of claim 1, wherein, a spacing of coils of the first inner coil portion and the second inner coil portion is 9 to 11 times a cross-sectional diameter of the coils.

8. The antenna of claim 1, wherein, a spacing between a coil located outermost of the first inner coil portion and the second inner coil portion and a coil located innermost of the first outer coil portion and the second outer coil portion is 9 to 11 times a cross-sectional diameter of the coils.

9. The antenna of claim 1, wherein, a ratio of a length to a width of a coil located on an outermost portion is 60% to 70%.

10. The antenna of claim 1, wherein a spacing of coils of the first outer coil portion and the second outer coil portion corresponds to a cross-sectional diameter of the coils.

11. An antenna for wireless power transmission comprising:

a first coil portion comprising a first outer coil portion and a first inner coil portion; and

a second coil portion comprising a second outer coil portion and a second inner coil portion, wherein the first coil portion and the second coil portion overlap and intersect each other at one or more points,

wherein, a spacing of coils of the first outer coil portion and the second outer coil portion corresponds to a cross-sectional diameter of the coils.