Wireless charging apparatus for preventing magnetic field cancellation between adjacent coils

Patent metadata

Field	Value
Publication number	US-2021066970-A1
Application number	US-202016797483-A
Country	US
Kind code	A1
Filing date	Feb 21, 2020
Priority date	Sep 3, 2019
Publication date	Mar 4, 2021
Grant date	—

Abstract

Disclosed herein is a wireless charging apparatus for preventing cancelation of magnetic fields generated between a plurality of adjacent transmission coils by placing a repeater on the plurality of transmission coils, the wireless charging apparatus including a plurality of transmission coils spaced the same distance apart from a reference point, and a repeater placed on the plurality of transmission coils to be overlapped with each of the plurality of transmission coils with respect to the reference point that is a center, wherein a coupling coefficient between each of the plurality of transmission coils and the repeater is higher than a coupling coefficient between the plurality of transmission coils.

First claim

What is claimed is:

1 . A wireless charging apparatus, comprising:
a plurality of transmission coils disposed adjacent to each other; and a repeater placed on the plurality of transmission coils to be overlapped with each of the plurality of transmission coils, wherein a coupling coefficient between one of the plurality of transmission coils and the repeater is higher than a coupling coefficient between two of the plurality of transmission coils.

2 . The wireless charging apparatus of claim 1 , wherein the plurality of transmission coils are spaced at a same distance apart from a reference point of the wireless charging apparatus.

3 . The wireless charging apparatus of claim 2 , wherein the reference point is a center of the repeater.

4 . The wireless charging apparatus of claim 1 , further comprising:
a flat-plate core on which the plurality of transmission coils are placed.

5 . The wireless charging apparatus of claim 1 , wherein the plurality of transmission coils are spaced a same distance apart from each other, or the plurality of transmission coils are stacked.

6 . The wireless charging apparatus of claim 1 , wherein the plurality of transmission coils comprise:
a first transmission coil; a second transmission coil placed at an upper portion of the first transmission coil, and overlapping a part of the first transmission coil; a third transmission coil placed at an upper portion of the second transmission coil, and overlapping a part of the first and second transmission coils respectively; and a fourth transmission coil placed at an upper portion of the third transmission coil, and overlapping a part of the first to third transmission coils respectively.

7 . The wireless charging apparatus of claim 1 , wherein a coupling coefficient between each of the plurality of transmission coils and the repeater is higher than the coupling coefficient between the two of the plurality of transmission coils.

8 . The wireless charging apparatus of claim 1 , wherein each of the plurality of transmission coils has a rectangle shape, and
wherein the plurality of transmission coils comprise:
a first transmission coil;
a second transmission coil placed in contact with one side of the first transmission coil;
a third transmission coil placed in contact with another side of the first transmission coil; and
a fourth transmission coil placed in contact with one side of the second transmission coil and one side of the third transmission coil.

9 . The wireless charging apparatus of claim 1 , wherein the plurality of transmission coils disposed adjacent to each other to form a first ring having a first radius,
the repeater has a ring shape having a second radius, the first radius and the second radius have a same center point, and the first radius is larger than the second radius.

10 . The wireless charging apparatus of claim 1 , wherein a central angle of each of the plurality of transmission coils is the same

11 . The wireless charging apparatus of claim 10 , wherein a total of the central angle of each of the plurality of transmission coils is 360 degrees.

12 . The wireless charging apparatus of claim 1 , wherein each of the plurality of transmission coils has a sector shape encircled by two sides and an arc connecting ends of the two sides, and
wherein the plurality of transmission coils comprise: a first transmission coil with a central angle of approximately 120 degrees; a second transmission coil placed in contact with one side of the first transmission coil with a central angle of approximately 120 degrees; and a third transmission coil placed in contact with another side of the first transmission coil with a central angle of approximately 120 degrees.

13 . The wireless charging apparatus of claim 1 , wherein an area encircled by an outer edge of the repeater is placed inside an area formed by the plurality of transmission coils.

14 . The wireless charging apparatus of claim 1 , wherein an area encircled by an inner edge of the repeater overlaps an area encircled by an inner edge of each of the plurality of transmission coils.

15 . The wireless charging apparatus of claim 1 , wherein a width of an area in which the repeater and a first one of the plurality of transmission coils are overlapped is the same as a width of an area in which the repeater and a second one of the plurality of transmission coils are overlapped.

16 . The wireless charging apparatus of claim 1 , wherein the wireless charging apparatus further comprises a controller that supplies electric currents to the plurality of transmission coils to guide the electric currents to a reception coil in a battery device, and when detecting the reception coil, the controller supplies electric currents to all of the plurality of transmission coils.

17 . The wireless charging apparatus of claim 16 , wherein the controller supplies electric currents to any one transmission coil among the plurality of transmission coils, transmits a request signal to the battery device, and detects the reception coil based on whether to receive a response signal to the request signal.

18 . The wireless charging apparatus of claim 16 , wherein a coupling coefficient between the reception coil and the repeater is higher than a coupling coefficient between the reception coil and each of the plurality of transmission coils.

19 . A wireless charging apparatus, comprising:
a plurality of transmission coils disposed adjacent to each other to form a configuration; and a repeater disposed to cover the plurality of transmission coils, wherein the repeater contacts the plurality of transmission coils, and wherein a width of the formed configuration of the plurality of transmission coils is greater than a width of the repeater.

20 . The wireless charging apparatus of claim 19 , wherein each of the plurality of transmission coils has a sector shape, a square shape, or a rectangle shape.

Assignees

• Lg Electronics Inc

Inventors

• Choi Hyengcheul
• Lee Seong Hun
• Kwak Bongsik
• Kwak Hyung Geol

Classifications

• H02J50/005

  Mechanical details of housing or structure aiming to accommodate the power transfer means, e.g. mechanical integration of coils, antennas or transducers into emitting or receiving devices · CPC title

• H02J50/502 Primary

  the energy repeater being integrated together with the emitter or the receiver · CPC title

• H02J50/90

  involving detection or optimisation of position, e.g. alignment · CPC title

• H02J50/10

  using inductive coupling · CPC title

• H02J50/50 Primary

  using additional energy repeaters between transmitting devices and receiving devices · CPC title