WIRELESS POWER RELAY DEVICE AND WIRELESS POWER TRANSMISSION SYSTEM

• US 20170054329A1
• Filed: 05/02/2014
• Published: 02/23/2017
• Est. Priority Date: 05/02/2014
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: LS Cable And System Limited (LS Cable)
• Inventors: PARK, Un-Kyu, YOU, Sung-Han, KIM, Young-Sun
• Granted Patent: US 10,158,252 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/20 using microwaves or radio frequency waves
• CPC Class Codes: H02J 50/50 using additional energy repeaters between transmitting devices and receiving devices

Abstract

The present invention is mainly directed to providing a wireless power relay device and a wireless power transmission device, which are capable of arranging a relay coil having higher transmission efficiency in a transmission-efficiency reducing section having lower transmission efficiency than those of a plurality of relay coils, thereby preventing power transmission efficiency from sharply decreasing in the transmission-efficiency reducing section.

Claims

1. A wireless power relay device which relays a magnetic field generated by a wireless power transmission device, the wireless power relay device comprising a plurality of relay coils configured to capture and relay the magnetic field,

wherein, when a transmission-efficiency reducing section occurs, at least one relay coil included in the transmission-efficiency reducing section among the plurality of relay coils relays the magnetic field to be out of phase with the magnetic field relayed by the other coils, wherein in the transmission-efficiency reducing section, transmission efficiency of a first relay coil spaced from the wireless power transmission device among the plurality of relay coils is lower than that of a second relay coil adjacent to the first relay coil and farther from the wireless power transmission device than the first relay coil.

2. The wireless power relay device of claim 1, wherein the at least one relay coil is arranged close to the other relay coils.

3. The wireless power relay device of claim 1, wherein the at least one relay coil has a larger coupling coefficient than coupling coefficients of the other relay coils.

4. The wireless power relay device of claim 3, wherein the at least one relay coil comprises a plurality of coils.

5. The wireless power relay device of claim 4, wherein the at least one relay coil comprises a plurality of coils having different internal diameters,

wherein, among the plurality of coils having different internal diameters, an inner coil having a smaller internal diameter is included in an outer coil having a larger internal diameter.

6. The wireless power relay device of claim 2, wherein, when the plurality of relay coils are arranged in a line with respect to the wireless power transmission device, the transmission-efficiency reducing section is a section in which a relay coil next to a relay coil farthest from the wireless power transmission device is located, and

the at least one relay coil is located in the transmission-efficiency reducing section.

7. The wireless power relay device of claim 6, wherein the at least one relay coil has a larger coupling coefficient than coupling coefficients of the other relay coils.

8. The wireless power relay device of claim 7, wherein the at least one relay coil comprises a plurality of coils.

9. The wireless power relay device of claim 8, wherein the at least one relay coil comprises a plurality of coils having different internal diameters,

wherein, among the plurality of coils having different internal diameters, an inner coil having a smaller internal diameter is included in an outer coil having a larger internal diameter.

10. The wireless power relay device of claim 2, wherein, when the plurality of relay coils are arranged on a plane, the transmission-efficiency reducing section is a section in which a relay coil spaced by an odd number of hops from a relay coil next to the wireless power transmission device is located, and

the at least one relay coil is located in the transmission-efficiency reducing section.

11. The wireless power relay device of claim 10, wherein the at least one relay coil has a larger coupling coefficient than coupling coefficients of the other relay coils.

12. The wireless power relay device of claim 11, wherein the at least one relay coil comprises a plurality of coils.

13. The wireless power relay device of claim 12, wherein the at least one relay coil comprises a plurality of coils having different internal diameters,

wherein, among the plurality of coils having different internal diameters, an inner coil having a smaller internal diameter is included in an outer coil having a larger internal diameter.

14. A wireless power transmission system comprising:

a wireless power transmission device configured to transmit power through a magnetic field; and

a wireless power relay device including a plurality of relay coils configured to capture and relay the magnetic field,

wherein, when a transmission-efficiency reducing section occurs, at least one relay coil included in the transmission-efficiency reducing section among the plurality of relay coils relays the magnetic field to be out of phase with the magnetic field relayed by the other coils, wherein in the transmission-efficiency reducing section, transmission efficiency of a first relay coil spaced from the wireless power transmission device among the plurality of relay coils is lower than that of a second relay coil adjacent to the first relay coil and farther from the wireless power transmission device than the first relay coil.

15. The wireless power transmission system of claim 14, wherein the at least one relay coil is arranged close to the other relay coils.

16. The wireless power transmission system of claim 15, wherein the at least one relay coil has a larger coupling coefficient than coupling coefficients of the other relay coils.

17. The wireless power transmission system of claim 16, wherein the at least one relay coil comprises a plurality of coils.

18. The wireless power transmission system of claim 17, wherein the at least one relay coil comprises a plurality of coils having different internal diameters,

wherein, among the plurality of coils having different internal diameters, an inner coil having a smaller internal diameter is included in an outer coil having a larger internal diameter.

19. The wireless power transmission system of claim 15, wherein, when the plurality of relay coils are arranged in a line with respect to the wireless power transmission device, the transmission-efficiency reducing section is a section in which a relay coil next to a relay coil farthest from the wireless power transmission device is located, and

the at least one relay coil is located in the transmission-efficiency reducing section.

20. The wireless power transmission system of claim 19, wherein the at least one relay coil has a larger coupling coefficient than coupling coefficients of the other relay coils.

21. The wireless power transmission system of claim 20, wherein the at least one relay coil comprises a plurality of coils.

22. The wireless power transmission system of claim 21, wherein the at least one relay coil comprises a plurality of coils having different internal diameters,

wherein, among the plurality of coils having different internal diameters, an inner coil having a smaller internal diameter is included in an outer coil having a larger internal diameter.

23. The wireless power transmission system of claim 15, wherein, when the plurality of relay coils are arranged on a plane, the transmission-efficiency reducing section is a section in which a relay coil spaced by an odd number of hops from a relay coil next to the wireless power transmission device is located, and

the at least one relay coil is located in the transmission-efficiency reducing section.

24. The wireless power transmission system of claim 23, wherein the at least one relay coil has a larger coupling coefficient than coupling coefficients of the other relay coils.

25. The wireless power transmission system of claim 24, wherein the at least one relay coil comprises a plurality of coils.

26. The wireless power transmission system of claim 25, wherein the at least one relay coil comprises a plurality of coils having different internal diameters,

wherein, among the plurality of coils having different internal diameters, an inner coil having a smaller internal diameter is included in an outer coil having a larger internal diameter.