Wireless power transmission system, resonator in wireless power transmission system, and resonator design method for optimum power division

• US 9,643,504 B2
• Filed: 09/13/2012
• Issued: 05/09/2017
• Est. Priority Date: 11/08/2011
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Ryu, Young Ho, Park, Eun Seok, Kwon, Sang Wook, Kim, Ki Young, Kim, Nam Yun, Kim, Dong Zo, Park, Yun Kwon, Song, Keum Su, Yoon, Chang Wook, Choi, Jin Sung
• Primary Examiner(s): Tran, Thienvu
• Assistant Examiner(s): Stables, David M
• Application Number:
  US13/614,098
• Publication Number:
  US 20130113296A1
• Time in Patent Office: 1,699 Days
• Field of Search: 307104
• CPC Class Codes: B60L 53/12 Inductive energy transfer
• CPC Class Codes: G06F 30/36 Circuit design at the analogue level
• CPC Class Codes: H02J 50/12 of the resonant type
• 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 7/00304 Overcurrent protection
• CPC Class Codes: H02J 7/00308 Overvoltage protection
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/7072 Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
• CPC Class Codes: Y02T 90/12 Electric charging stations
• CPC Class Codes: Y02T 90/14 Plug-in electric vehicles
• CPC Class Codes: Y02T 90/16 Information or communication technologies improving the operation of electric vehicles

Abstract

A wireless power transmission system, a resonator in the wireless power transmission system, and a resonator design method for optimum power division are provided. A power receiver of the wireless power transmission system, includes a resonator configured to receive a power from a power transmitter. The power receiver further includes a power supply configured to supply the received power to a load. A figure of merit (FOM) of the resonator corresponds to a power dividing ratio of the power transmitter.

Claims

1. A power receiver of a wireless power transmission system, the power receiver comprising:

a resonator configured to wirelessly receive a power from a power transmitter; and

a power supply configured to supply the received power to a load,

wherein a figure of merit (FOM) of the resonator is determined based on a reference FOM of a source resonator of the power transmitter, and a constant set in advance, and

wherein the constant comprises a value within an error margin set in advance.

2. The power receiver of claim 1, wherein the constant is defined by the following equation:

3. The power receiver of claim 1, wherein the reference FOM is defined by the following equation:

U_ref=k_ref√

{square root over (Q₀Q_ref)},

where U_ref denotes the reference FOM, k_ref denotes a coupling coefficient of a reference device, Q₀ denotes a quality factor of the source resonator, and Q_ref denotes a quality factor of the reference device.

4. The power receiver of claim 1, wherein the error margin satisfies the following condition:

0.95×

DC≦

R_design≦

1.05×

DC,

where R_design denotes the error margin, and DC denotes the design constant.

5. The power receiver of claim 1, wherein the FOM of the resonator is defined by the following equation:

6. The power receiver of claim 5, wherein:

the reference FOM U_ref is defined by the following equation

U_ref=k_ref√

{square root over (Q₀Q_ref)},

where k_ref denotes a coupling coefficient of the reference device, Q₀ denotes a quality factor of the source resonator, and Q_ref denotes a quality factor of the reference device; and

the amount required by the reference device is 1 Watt.

7. The power receiver of claim 1, wherein:

a power dividing ratio comprises a ratio of an amount of power required by the load to an amount of power required by a reference device, the power dividing ratio corresponding to the FOM; and

the reference device and the power receiver receive the power at the same time.

8. The power receiver of claim 1, wherein:

the FOM of the resonator is determined based on a ratio of an amount of power required by the load to an amount of power required by a reference device.

9. The power receiver of claim 8, wherein:

the amount of the power required by the load comprises a value in a range of 85% to 115% of a dissipation power of the load.

10. A method of designing a resonator configured to receive a power from a power transmitter, the method comprising:

receiving information on an amount of power required by a load connected to the resonator;

determining a figure of merit (FOM) of the resonator based on the received information and a power dividing ratio of the power transmitter; and

determining a design parameter of the resonator based on the FOM of the resonator,

wherein the FOM of the resonator is determined using a reference FOM of a source resonator of the power transmitter and a constant set in advance, and

wherein the constant comprises a value within an error marlin set in advance.

11. The method of claim 10, wherein:

the design parameter comprises a size of the resonator, or a thickness of a conductor included in the resonator, or a width of the conductor, or a loss of the conductor, or a resistance of the conductor, or an inductance value of the resonator, or any combination thereof.

12. The method of claim 10, wherein:

a power dividing ratio comprises a ratio of the amount of the power required by the load to an amount of power required by a reference device, the power dividing ratio corresponding to the FOM; and

the reference device and the resonator receive the power at the same time.

13. The method of claim 10, wherein the FOM of the resonator is defined by the following equation:

14. The method of claim 13, wherein:

the reference FOM U_ref is defined by the following equation

U_ref=k_ref√

{square root over (Q₀Q_ref)},

where k_ref denotes a coupling coefficient of the reference device, Q₀ denotes a quality factor of the source resonator, and Q_ref denotes a quality factor of the reference device; and

the amount of the power required by the reference device is 1 Watt.

15. The method of claim 10, wherein the constant is defined by the following equation:

16. The method of claim 10, wherein the error margin satisfies the following condition:

0.95×

DC≦

R_design≦

1.05×

DC,

where R_design denotes the error margin, and DC denotes the constant.

17. The method of claim 10, wherein:

the FOM of the resonator is determined based on a ratio of the amount of the power required by the load to an amount of power required by a reference device.

18. The method of claim 17, wherein:

the amount of the power required by the load comprises a value in a range of 85% to 115% of a dissipation power of the load.

19. An apparatus configured to determine a design parameter of a resonator configured to receive a power from a power transmitter, the apparatus comprising:

an input unit configured to receive information on an amount of power required by a load connected to the resonator;

a figure-of-merit (FOM) determining unit configured to determine a FOM of the resonator based on the received information and a power dividing ratio of the power transmitter; and

a design parameter determining unit configured to determine a design parameter of the resonator based on the FOM of the resonator,

wherein the FOM of the resonator is determined using a reference FOM of a source resonator of the power transmitter, and a constant set in advance, and

wherein the constant comprises a value within an error margin set in advance.