Wireless power transmitter

• US 9,300,366 B2
• Filed: 10/12/2012
• Issued: 03/29/2016
• Est. Priority Date: 10/14/2011
• Status: Active Grant

• Current Assignee: Nera Innovations Limited (Atlantic IP Services Limited)
• Original Assignee: LG Innotek Company Limited (LG Corporation)
• Inventors: Jung, Woo Kil, Lee, Jung Oh
• Primary Examiner(s): Barnie, Rexford
• Assistant Examiner(s): DHILLON, JAGDEEP S
• Application Number:
  US13/650,802
• Publication Number:
  US 20130093255A1
• Time in Patent Office: 1,264 Days
• Field of Search: 307/104, 307/9.1, 307/10.1, 307/82, 307/66, 307/64, 307/80, 320/108, 320/107, 320/109, 320/106, 604/20, 604/19, 604/22, 336/220, 336/222
• US Class Current: 1/1
• 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: H02J 50/402 the two or more transmitting or the two or more receiving devices being integrated in the same unit, e.g. power mats with several coils or antennas with several sub-antennas
• CPC Class Codes: H02J 7/00 Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
• CPC Class Codes: H04B 5/00 Near-field transmission systems, e.g. inductive or capacitive transmission systems
• CPC Class Codes: H04B 5/24 Inductive coupling
• CPC Class Codes: H04B 5/79 for data transfer in combination with power transfer

Abstract

A wireless power transmitter according to an embodiment includes a coil and a capacitor which resonate with a wireless power receiver. The coil includes a plurality of cell groups and a core which connects the cell groups with each other. Each of the cell groups includes a plurality of cells. Each of the cells is configured such that magnetic field generated by currents flowing through the cells are formed in a same direction. Each of the cell groups is adjacent to at least one cell group. Each of the cell groups and the core are configured as one conductive wire.

Claims

1. A wireless power transmitter comprising:

a coil and a capacitor which resonate with a wireless power receiver,

wherein the coil includes a plurality of cell groups and a core which connects the cell groups with each other,

wherein each of the cell groups includes a plurality of cells,

wherein each of the cells is configured such that a magnetic field generated by currents flowing through the cells of a cell group is formed in a same direction,

wherein each of the cell groups is adjacent to at least one cell group,

wherein each of the cell groups and the core are configured as one conductive wire,

wherein a direction of a magnetic field formed by a first cell group of the cell groups is different from a direction of a magnetic field formed by a second cell group of the cell groups, and wherein the first and second cell groups are adjacent to each other and connected to each other through the core.

2. The wireless power transmitter of claim 1, wherein the magnetic field formed by the first cell group is directed to an inside of the first cell group, and the magnetic field formed by the second cell group is directed to an outside of the second cell group.

3. The wireless power transmitter of claim 1, wherein the magnetic field generated from the first cell group changes the direction of the magnetic field generated from the second cell group.

4. The wireless power transmitter of claim 1, wherein the cells of the first cell group and the cells of the second group are alternately wound in a clockwise direction and a counterclockwise direction.

5. The wireless power transmitter of claim 4, wherein the cells of the first cell group and the cells of the second group are alternately wound and stacked in the clockwise direction and the counterclockwise direction.

6. The wireless power transmitter of claim 1, wherein the directions of the magnetic field are based on the right-hand screw rule of Ampere.

7. The wireless power transmitter of claim 1, wherein distances between the cells of each cell group are equal to each other.

8. The wireless power transmitter of claim 1, wherein the cells of each cell group and the cells of an adjacent cell group are vertically connected with each other through the core.

9. The wireless power transmitter of claim 1, wherein planes formed by the cells of each cell group are parallel with each other.

10. The wireless power transmitter of claim 8, wherein planes formed by the cells of each cell group have one of a rectangular shape and a triangular shape.

11. The wireless power transmitter of claim 1, wherein the cell groups are formed on a printed circuit board.

12. The wireless power transmitter of claim 1, wherein the cells are formed by the conductive wire wound at least one time.

13. The wireless power transmitter of claim 1, wherein the conductive wire includes copper.