WIRELESS POWER TRANSFER DEVICE AND WIRELESS CHARGING SYSTEM HAVING SAME

• US 20160118179A1
• Filed: 01/24/2014
• Published: 04/28/2016
• Est. Priority Date: 02/04/2013
• Status: Abandoned Application

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: PARK, Jinmoo, JUNG, Kihyun, LEE, Jihyun, LEE, Hyunbeom, LEE, Jaesung
• Application Number:
  US14/764,874
• Publication Number:
  US 20160118179A1
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H01F 27/2871 Pancake coils
• CPC Class Codes: H01F 27/36 Electric or magnetic shields or screens movable for varying inductance H01F21/10
• 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 50/005 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 Class Codes: H02J 50/10 using inductive coupling
• CPC Class Codes: H02J 7/00034 Charger exchanging data with an electronic device, i.e. telephone, whose internal battery is under charge
• CPC Class Codes: H02J 7/00045 Authentication, i.e. circuits for checking compatibility between one component, e.g. a battery or a battery charger, and another component, e.g. a power source
• CPC Class Codes: H02J 7/00304 Overcurrent protection
• CPC Class Codes: H02J 7/00308 Overvoltage protection

Abstract

According to an embodiment of the present invention, a wireless power transmitter comprises a base station configured to supply power to a portable electronic device, a coil formed in a manner of winding a wire and configured to convert a current into a magnetic flux, and a shielding unit configured to shield the base station from a magnetic field generated in the coil, wherein the coil has a triangular shape and is formed into a single layer.

Claims

1. A wireless power transmitter for charging a portable electronic device, the transmitter comprising:

a base station configured to supply power to the portable electronic device;

a coil formed in a manner of winding a wire, and configured to convert a current into a magnetic flux; and

a shielding unit configured to shield the base station from a magnetic field generated in the coil,

wherein the coil is formed into a single layer in a shape of a triangle.

2. The wireless power transmitter of claim 1, wherein the shielding unit overlaps the coil, and at least part thereof exceeds an outer diameter of the Coil.

3. The wireless power transmitter of claim 2, wherein the shielding unit extends from the outer diameter of the coil by at least 2.5 mm, and is arranged below the coil by the maximum distance of 1.0 mm.

4. The wireless power transmitter of claim 2, wherein the shielding unit has a thickness of at least 0.7 mm.

5. The wireless power transmitter of claim 2, further comprising a body tiltably connected to the base station,

wherein the shielding unit is located between a case of the base station and the coil.

6. The wireless power transmitter of claim 1, wherein a distance from the coil to one surface (interface surface) of the base station is 3.0±

0.5 mm.

7. The wireless power transmitter of claim 1, wherein full bridge and half-bridge inverter topologies as well as capacitance are used to operate the coil.

8. The wireless power transmitter of claim 7, wherein self-inductances of the coil and the shielding unit within driving frequency ranges related to the full-bridge and half-bridge inverter topologies are 7.8±

10% μ

H.

9. The wireless power transmitter of claim 1, wherein the single layer is formed in a manner that a wire is wound along sides of an isosceles triangle on the same plane.

10. The wireless power transmitter of claim 9, wherein the isosceles triangle has a height longer than a base line thereof.

11. The wireless power transmitter of claim 10, wherein the coil has an outer height of 68±

0.5 mm, an outer width of 59±

0.5 mm, an inner height of 44±

0.5 mm, and an inner width of 35±

0.5 mm.

12. The wireless power transmitter of claim 9, wherein the coil has a thickness of 1.5±

0.5 mm.

13. The wireless power transmitter of claim 9, wherein the wire is wound eight (8) times in the single layer.

14. The wireless power transmitter of claim 9, wherein the coil is formed of a 16 WAG litz wire of 180 strands of a diameter of 0.8 mm or corresponding numerals.

15. A portable electronic device charged by a wireless power transmitter,

wherein a receiving coil unit of the portable electronic device comprises a coil formed in a manner of winding a wire, and configured to convert a current into a magnetic flux, and

wherein the coil has a rectangular shape and is formed into a single layer, the coil receiving the magnetic flux from a coil of the wireless power transmitter, wherein the coil of the wireless power transmitter is formed into a single layer in a shape of a triangle.

16. A wireless charging system comprising:

a wireless power transmitter configured to transfer power in a wireless manner; and

a portable electronic device configured to receive power in a wireless manner from the wireless power transmitter,

wherein the wireless power transmitter comprises;

a base station configured to supply power to the portable electronic device;

a coil formed in a manner of winding a wire and configured to convert a current into magnetic flux; and

a shielding unit configured to shield the base station from a magnetic field generated in the coil,

wherein the coil is formed into a single layer in a shape of a triangle.