WIRELESS POWER TRANSFER METHOD, WIRELESS POWER TRANSMITTER AND WIRELESS CHARGING SYSTEM

• US 20140361739A1
• Filed: 06/10/2014
• Published: 12/11/2014
• Est. Priority Date: 06/11/2013
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: SEO, Jeongkyo, LEE, Seonghun, KWAK, Bongsik
• Granted Patent: US 9,843,196 B2
• Time in Patent Office: Days
• US Class Current: 320/108
• 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 50/70 involving the reduction of electric, magnetic or electromagnetic leakage fields
• CPC Class Codes: H02J 50/80 involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
• CPC Class Codes: H02J 50/90 involving detection or optimisation of position, e.g. alignment
• 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
• CPC Class Codes: H04B 5/24 Inductive coupling
• CPC Class Codes: H04B 5/263 Multiple coils at either side
• CPC Class Codes: H04B 5/266 One coil at each side, e.g. with primary and secondary coils
• CPC Class Codes: H04B 5/79 for data transfer in combination with power transfer

Abstract

The present disclosure relates to a wireless power transmitter, a wireless power receiver and a wireless charging system in a wireless power transfer field. A wireless power transmitter disclosed herein includes a first coil configured to transfer a wireless power signal to a wireless power receiver, a second coil having a wire wound to transfer power to the wireless power receiver in a wireless manner, and a controller configured to control operations of the first and second coils, wherein the first coil is provided with a wire wound along an edge of a shape of the second coil.

Claims

1. A wireless power receiver comprising:

a first coil configured to transmit and receive a wireless power signal to and from a wireless power transmitter;

a second coil having a wire wound to receive power from the wireless power transmitter in a wireless manner; and

a controller configured to control the transmission and reception of the wireless power signal and the reception of the wireless power,

wherein the first coil and the second coil are disposed neighboring to each other.

2. The receiver of claim 1, wherein the first coil is provided with a wire wound along an edge of a shape of the second coil.

3. The receiver of claim 2, wherein the wire of the first coil is wound along one of an inner edge or an outer edge of the second coil.

4. The receiver of claim 3, wherein the wire of the first coil is surrounded by the inner edge of the second coil or surrounds the outer edge of the second coil.

5. The receiver of claim 3, wherein the shape of the first coil corresponds to the shape of the second coil.

6. The receiver of claim 1, wherein the wire of the second coil is formed on a single layer, and the wire of the first coil is disposed on the single layer.

7. The receiver of claim 6, wherein the second coil is provided with a wire which is turned 20 times on the single layer, and has a thickness of 1.15 mm±

0.3.

8. The receiver of claim 7, wherein the first coil and the second coil are configured to receive the wireless power signal and the wireless power, respectively, through a transmitting coil provided at the wireless power transmitter, and

wherein the transmitting coil has an inner diameter of 72 mm (±

10%), and an outer diameter of 120 mm.

9. The receiver of claim 1, wherein the second coil has an inner diameter of 52 mm (±

10%), and an outer diameter of 100 mm.

10. The receiver of claim 1, further comprising a shielding member configured to overlap the first and second coils, and

wherein the shielding member has a shape of a rectangular plate of 105 mm long sides, and a thickness of at least 2.5 mm.

11. The receiver of claim 1, wherein the number of turns of the wire of the first coil is smaller than the number of turns of the wire of the second coil.

12. The receiver of claim 1, wherein a low voltage induced in the first coil is lower than a medium voltage induced in the second coil.

13. The receiver of claim 1, wherein the wireless power signal received through the first coil is a wireless power signal of low power, and

wherein the wireless power received through the second coil corresponds to medium power.

14. A wireless charging system comprising a wireless power transmitter and a wireless power receiver,

wherein the wireless power receiver comprises:

a first coil configured to transmit and receive a wireless power signal to and from a single coil of the wireless power transmitter; and

a second coil having a wire that is wound to receive power from the single coil of the wireless power transmitter in a wireless manner, wherein the wire has a shape corresponding to a shape of the first coil.

15. The system of claim 14, wherein the wireless power transmitter comprises a single transmitting coil.

16. The system of claim 14, wherein the wire of the first coil is wound along one of an inner edge or an outer edge of the second coil.

17. The system of claim 16, wherein the wire of the first coil is surrounded by the inner edge of the second coil, or surrounds the outer edge of the second coil.

18. The system of claim 16, wherein the shape of the first coil corresponds to the shape of the second coil.

19. The system of claim 14, wherein the wire of the second coil is formed on a single layer, and the wire of the first coil is disposed on the single layer.

20. The system of claim 19, wherein the second coil is provided with a wire that is turned 20 times on the single layer and has a thickness of 1.15 mm±

0.3.

21. The system of claim 14, wherein the wireless power transmitter comprises:

a first transmitting coil configured to transfer a wireless power signal to the wireless power receiver;

a second transmitting coil having a wire wound to transfer power to the wireless power receiver in a wireless manner; and

a controller configured to control operations of the first and second transmitting coils,

wherein the first transmitting coil is provided with a wire wound along an edge of a shape of the second transmitting coil.

22. The system of claim 21, wherein the second transmitting coil has an inner diameter of 72 mm (±

10%) and an outer diameter of 120 mm.

23. The system of claim 21, further comprising a shielding member configured to overlap the first and second transmitting coils, and

wherein the shielding member has a shape of a rectangular plate of 125 mm long sides, and a thickness of at least 2.5 mm.