WIRELESS POWER TRANSMISSION SYSTEM AND RESONATOR FOR THE SYSTEM

• US 20120217820A1
• Filed: 07/06/2010
• Published: 08/30/2012
• Est. Priority Date: 07/06/2009
• Status: Abandoned Application

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Hong, Young Tack, Lee, Jung Hae, Kwon, Sang Wook, Park, Eun Seok, Park, Jae Hyun, Park, Byung Chul
• Application Number:
  US13/381,961
• Publication Number:
  US 20120217820A1
• Time in Patent Office: Days
• US Class Current: 307/104
• CPC Class Codes: H01P 7/08 Strip line resonators
• CPC Class Codes: H01Q 7/005 with variable reactance for tuning the antenna

Abstract

Provided is a wireless power resonator. The wireless power resonator may include a transmission line and a capacitor, may form a loop structure, and may further include a matcher to determine an impedance of the wireless power resonator.

Claims

1. A wireless power resonator, comprising:

a transmission line comprising a first signal conducting portion, a second signal conducting portion, and a ground conducting portion corresponding to the first signal conducting portion and the second signal conducting portion;

a first conductor that electrically connects the first signal conducting portion and the ground conducting portion;

a second conductor that electrically connects the second signal conducting portion and the ground conducting portion; and

at least one capacitor inserted between the first signal conducting portion and the second signal conducting portion in series with respect to a current flowing through the first signal conducting portion and the second signal conducting portion.

2. The wireless power resonator of claim 1, wherein the transmission line, the first conductor, and the second conductor form a loop structure.

3. The wireless power resonator of claim 1, wherein the transmission line, the first conductor, and the second conductor form a loop structure provided in a rectangular shape.

4. The wireless power resonator of claim 3, further comprising:

a matcher, disposed inside a loop formed by the transmission line, the first conductor, and the second conductor, to determine an impedance of the wireless power resonator.

5. The wireless power resonator of claim 4, wherein the matcher is provided in a rectangular shape.

6. The wireless power resonator of claim 4, wherein the matcher changes a physical size of the matcher so as to adjust the impedance of the wireless power resonator based on a control signal provided by a controller.

7. The wireless power resonator of claim 4, wherein the controller generates the control signal based on a state of an opposite resonator that receives power from the wireless power resonator or transmits power to the wireless power resonator.

8. The wireless power resonator of claim 4, wherein the controller generates the control signal based on at least one of a distance between the wireless power resonator and a wireless power resonator of a wireless power receiver, a reflection coefficient of a wave transmitted from the wireless power resonator to the wireless power resonator of the wireless power receiver, a power transmission gain between the wireless power resonator and the wireless power resonator of the wireless power receiver, and a coupling efficiency between the wireless power resonator and the wireless power resonator of the wireless power receiver.

9. The wireless power resonator of claim 4, wherein:

the matcher is a conductor for impedance matching, which is located at a predetermined distance away from the ground conducting portion; and

the impedance of the wireless power resonator is adjusted based on a distance between the ground conducting portion and the conductor for the impedance matching.

10. The wireless power resonator of claim 4, wherein the matcher comprises at least one active element that adjusts the impedance of the wireless power resonator based on a control signal provided by a controller.

11. The wireless power resonator of claim 1, wherein the at least one capacitor, corresponding to a lumped element, is inserted between the first signal conducting portion and the second signal conducting portion.

12. The wireless power resonator of claim 1, wherein the at least one capacitor, corresponding to a distributed element, has a zigzagged structure.

13. The wireless power resonator of claim 1, wherein a capacitance of the at least one capacitor is determined based on at least one of criteria including a criterion for enabling the wireless power resonator to have a characteristic of a metamaterial, a criterion for enabling the wireless power resonator to have a negative magnetic permeability in a target frequency, and a criterion for enabling the wireless power resonator to have a zeroth-order resonance characteristic in the target frequency.

14. The wireless power resonator of claim 1, wherein a surface of the first signal conducting portion or a surface of the second signal conducting portion includes a plurality of conductor lines in parallel, and one end of each conductor line is shorted.

15. The wireless power resonator of claim 1, wherein the first signal conducting portion and the ground conducting portion are seamlessly connected to each other, and the second signal conducting portion and the ground conducting portion are seamlessly connected to each other.

16. The wireless power resonator of claim 1, wherein an internal portion of at least one of the first signal conducting portion, the second signal conducting portion, and the ground conducting portion is empty.

17. The wireless power resonator of claim 1, further comprising:

a magnetic core that penetrates the first signal conducting portion, the second signal conducting portion, and the ground conducting portion.

18. The wireless power resonator of claim 1, wherein, when the wireless power resonator comprises at least two transmission lines, the at least two transmission lines are connected in series, in parallel, or in a spiral, and at least one capacitor is inserted between a first signal conductor and a second signal conductor included in each transmission line.

19. A wireless power transmitter, comprising:

a pre-processor to generate a frequency and a current for wireless power transmission using energy supplied from a power supplier; and

a wireless power resonator to wirelessly transmit power using the current at the generated frequency,

wherein the wireless power resonator comprises;

a transmission line comprising a first signal conducting portion, a second signal conducting portion, and a ground conducting portion corresponding to the first signal conducting portion and the second signal conducting portion;

a first conductor to electrically connect the first signal conducting portion and the ground conducting portion;

a second conductor to electrically connect the second signal conducting portion and the ground conducting portion; and

at least one capacitor inserted between the first signal conducting portion and the second signal conducting portion in series with respect to a current flowing through the first signal conducting portion and the second signal conducting portion.

20. The wireless power transmitter of claim 19, wherein the transmission line, the first conductor, and the second conductor form a loop structure.

21. The wireless power transmitter of claim 19, further comprising:

a matcher, disposed inside a loop formed by the transmission line, the first conductor, and the second conductor, to determine an impedance of the wireless power resonator.

22. The wireless power transmitter of claim 19, wherein the pre-processor comprises:

an alternating current-direct current (AC/DC) converter to convert AC energy supplied from a power supplier into DC energy; and

a frequency generator to generate a current having a frequency based on the DC energy.

23. The wireless power transmitter of claim 19, further comprising:

a controller to generate a control signal based on at least one of a distance between the wireless power resonator and a wireless power resonator of a wireless power receiver, a reflection coefficient of a wave transmitted from the wireless power resonator to the wireless power resonator of the wireless power receiver, a power transmission gain between the wireless power resonator and the wireless power resonator of the wireless power receiver, and a coupling efficiency between the wireless power resonator and the wireless power resonator of the wireless power receiver.

24. The wireless power transmitter of claim 19, further comprising:

a detector to detect at least one of a distance between the wireless power resonator and a wireless power resonator of a wireless power receiver, a reflection coefficient of a wave transmitted from the wireless power resonator to the wireless power resonator of the wireless power receiver, a power transmission gain between the wireless power resonator and the wireless power resonator of the wireless power receiver, and a coupling efficiency between the wireless power resonator and the wireless power resonator of the wireless power receiver.

25. The wireless power transmitter of claim 23, wherein the controller adjusts a frequency based on at least one of the distance between the wireless power resonator and the wireless power resonator of the wireless power receiver, the reflection coefficient of the wave transmitted from the wireless power resonator to the wireless power resonator of the wireless power receiver, the power transmission gain between the wireless power resonator and the wireless power resonator of the wireless power receiver, and the coupling efficiency between the wireless power resonator and the wireless power resonator of the wireless power receiver.

26. A wireless power receiver, comprising:

a wireless power resonator to receive power wirelessly; and

a rectifier to convert the received power into direct current (DC) energy,

wherein the wireless power resonator comprises;

a transmission line comprising a first conducting signal portion, a second signal conducting portion, and a ground conducting portion corresponding to the first signal conducting portion and the second signal conducting portion;

a first conductor to electrically connect the first signal conducting portion and the ground conducting portion;

a second conductor to electrically connect the second signal conducting portion and the ground conducting portion; and

at least one capacitor inserted between the first signal conducting portion and the second signal conducting portion in series with respect to a current flowing through the first signal conducting portion and the second signal conducting portion.

27. The wireless power receiver of claim 26, wherein the transmission line, the first conductor, and the second conductor form a loop structure.

28. The wireless power receiver of claim 26, further comprising:

a matcher, disposed inside a loop formed by the transmission line, the first conductor, and the second conductor, to determine an impedance of the wireless power resonator.

29. The wireless power receiver of claim 26, further comprising:

a controller to generate a control signal based on at least one of a distance between the wireless power resonator and a wireless power resonator of a wireless power transmitter, a reflection coefficient of a wave transmitted from the wireless power resonator of the wireless power transmitter to the wireless power resonator, a power transmission gain between the wireless power resonator and the wireless power resonator of the wireless power transmitter, and a coupling efficiency between the wireless power resonator and the wireless power resonator of the wireless power transmitter.

30. A wireless power transmitting method, the method comprising:

generating a frequency and a current for wireless power transmission using energy supplied from a power supplier; and

providing the frequency and the current to a wireless power resonator,

wherein the wireless power resonator comprises;

a transmission line comprising a first signal conducting portion, a second signal conducting portion, and a ground conducting portion corresponding to the first signal conducting portion and the second signal conducting portion;

a first conductor to electrically connect the first signal conducting portion and the ground conducting portion;

a second conductor to electrically connect the second signal conducting portion and the ground conducting portion; and

at least one capacitor inserted between the first signal conducting portion and the second signal conducting portion in series with respect to a current flowing through first signal conducting portion and the second signal conducting portion.

31. The method of claim 30, wherein the transmission line, the first conductor, and the second conductor form a loop structure.

32. The method of claim 30, wherein the wireless power resonator further includes a matcher, disposed inside a loop formed by the first conductor and the second conductor, to determine an impedance of the wireless power resonator.

33. A wireless power receiving method, the method comprising:

receiving power wirelessly, using a wireless power resonator;

converting the received power into direct current (DC) energy using a rectifier; and

providing the DC energy to a target device,

wherein the wireless power resonator comprises;

a transmission line comprising a first signal conducting portion, a second signal conducting portion, and a ground conducting portion corresponding to the first signal conducting portion and the second signal conducting portion;

a first conductor to electrically connect the first signal conducting portion and the ground conducting portion;

a second conductor to electrically connect the second signal conducting portion and the ground conducting portion; and

at least one capacitor inserted between the first signal conducting portion and the second signal conducting portion in series with respect to a current flowing through the first signal conducting portion and the second signal conducting portion.

34. The method of claim 33, wherein the transmission line, the first conductor, and the second conductor form a loop structure.

35. The method of claim 33, wherein the wireless power resonator further comprises a matcher, disposed inside a loop formed by the transmission line, the first conductor, and the second conductor, to determine an impedance of the wireless power resonator.

36. The method of claim 33, further comprising:

storing the DC energy in a power storage unit.

37. The method of claim 33, further comprising:

utilizing the DC energy as power for the target device.

38. A wireless power transmission/reception system, the system comprising:

a wireless power transmitter; and

a wireless power receiver,

wherein;

the wireless power transmitter comprises;

a pre-processor to generate a frequency and a current for wireless power transmission using energy supplied from a power supplier; and

a wireless power transmission resonator to transmit power wirelessly to the wireless power receiver using the current at the frequency,

the wireless power receiver comprises;

a wireless power reception resonator to receive power wirelessly from the wireless power transmitter; and

a rectifier to convert the received power into DC energy, and

at least one of the wireless power transmission resonator and the wireless power reception resonator comprises;

a transmission line comprising a first signal conducting portion, a second signal conducting portion, and a ground conducting portion corresponding to the first signal conducting portion and the second signal conducting portion;

a first conductor to electrically connect the first signal conducting portion and the ground conducting portion;

a second conductor to electrically connect the second signal conducting portion and the ground conducting portion; and

at least one capacitor inserted between the first signal conducting portion and the second signal conducting portion in series with respect to a current flowing through the first signal conducting portion and the second signal conducting portion.

39. The system of claim 38, wherein the at least one of the wireless power transmission resonator and the wireless power reception resonator further comprises a matcher, disposed inside a loop formed by the transmission line, the first conductor, and the second conductor, to determine an impedance of the wireless power resonator.