WIRELESS POWER RELAY DEVICE AND WIRELESS POWER TRANSMISSION SYSTEM

• US 20170054330A1
• 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: YOU, Sung-Han, KIM, Young-Sun, PARK, Un-Kyu
• Granted Patent: US 10,158,253 B2
• Time in Patent Office: Days
• 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 50/20 using microwaves or radio frequency waves
• CPC Class Codes: H02J 50/50 using additional energy repeaters between transmitting devices and receiving devices
• CPC Class Codes: H02J 7/00308 Overvoltage protection

Abstract

The present invention is mainly directed to providing a wireless power relay device and a wireless power transmission system, which are capable of reinforcing a relay coil in which a high voltage is induced among a plurality of relay coils, thereby preventing the relay coil from being damaged due to the induction of the high voltage.

Claims

1. A wireless power relay device comprising a plurality of relay coils configured to relay power transmission by capturing a magnetic field,

wherein power is transmitted through the magnetic field to a predetermined point among points at which the plurality of relay coils are arranged,

wherein a relay coil at the predetermined point has a larger impedance value than impedance values of the other relay coils.

2. The wireless power relay device of claim 1, wherein, when location or a number of load resistors which are adjacent to the relay coil at the predetermined point and transmit the power is changed, a higher voltage is induced in the relay coil at the predetermined point than the other relay coils.

3. The wireless power relay device of claim 1, wherein, when the plurality of relay coils are arranged in a line, a higher voltage is induced in the relay coil at the predetermined point than the other relay coils.

4. The wireless power relay device of claim 1, wherein the relay coil at the predetermined point has a smaller resistance value than resistance values of the other relay coils.

5. The wireless power relay device of claim 4, wherein a number of turns of the relay coil at the predetermined point is less than numbers of turns of the other relay coils.

6. The wireless power relay device of claim 1, wherein the relay coil at the predetermined point has a greater mutual inductance value than mutual inductance values the other relay coils.

7. The wireless power relay device of claim 6, wherein the relay coil at the predetermined point has a greater coupling coefficient K than coupling coefficients of the other relay coils.

8. The wireless power relay device of claim 7, wherein a distance between the relay coil at the predetermined point and a least one among relay coils neighboring the relay coil is less than distances between the other relay coils.

9. A wireless power relay device comprising a plurality of relay coils configured to relay power transmission by capturing a magnetic field,

wherein power is transmitted to a predetermined point through the magnetic field among points at which the relay coils are arranged,

wherein a relay coil in which a voltage which is greater than or equal to a withstanding voltage allowable in a capacitor thereof is induced among relay coils which are in a path in which the magnetic field is transmitted to the predetermined point has a higher impedance value than impedance values of the other relay coils which are in the path in which the magnetic field is transmitted to the predetermined point.

10. The wireless power relay device of claim 9, wherein, when location or a number of load resistors which are adjacent to the relay coil at the predetermined point and transmit power is changed, a higher voltage is induced in the relay coil at the predetermined point than the other relay coils.

11. The wireless power relay device of claim 9, wherein, when the plurality of relay coils are arranged in a line, a higher voltage is induced in the relay coil at the predetermined point than the other relay coils.

12. The wireless power relay device of claim 9, wherein the relay coil at the predetermined point has a lower resistance value than resistance values of the other relay coils.

13. The wireless power relay device of claim 12, wherein a number of turns of the relay coil at the predetermined point is than numbers of turns of the other relay coils.

14. The wireless power relay device of claim 9, wherein the relay coil at the predetermined point has a greater mutual inductance value than mutual inductance values of the other relay coils.

15. The wireless power relay device of claim 14, wherein the relay coil at the predetermined point has a greater coupling coefficient K than coupling coefficients of the other relay coils.

16. The wireless power relay device of claim 15, wherein a distance between the relay coil at the predetermined point and at least one among relay coils neighboring the relay coil is less than distances between the other relay coils.

17. A wireless power transmission system comprising:

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

a plurality of relay coils configured to capture and relay the magnetic field,

wherein the wireless power transmission system transmits power to a predetermined point through the magnetic field among points at which the plurality of relay coils are arranged,

wherein a relay coil in which a voltage which is greater than or equal to a withstanding voltage allowable in a capacitor thereof is induced among relay coils which are in a path in which the magnetic field is transmitted to the predetermined point has a higher impedance value than impedance values of the other relay coils which are in the path in which the magnetic field is transmitted to the predetermined point.

18. The wireless power transmission system of claim 17, wherein, when location or a number of load resistors which are adjacent to the relay coil at the predetermined point and transmit the power is changed, a higher voltage is induced in the relay coil at the predetermined point than the other relay coils.

19. The wireless power transmission system of claim 17, wherein, when the plurality of relay coils are arranged in a line, a higher voltage is induced in the relay coil at the predetermined point than the other relay coils.

20. The wireless power transmission system of claim 17, wherein the relay coil at the predetermined point has a lower resistance value than resistance values of the other relay coils.

21. The wireless power transmission system of claim 20, wherein a number of turns of the relay coil at the predetermined point is less than numbers of turns of the other relay coils.

22. The wireless power transmission system of claim 17, wherein the relay coil at the predetermined point has a larger mutual inductance value than mutual inductance values of the other relay coils.

23. The wireless power transmission system of claim 22, wherein the relay coil at the predetermined point has a larger coupling coefficient K than coupling coefficients of the other relay coils.

24. The wireless power transmission system of claim 23, wherein a distance between the relay coil at the predetermined point and at least one among relay coils neighboring the relay coil is less than distances between the other relay coils.