APPARATUS AND METHOD FOR RESONANCE IN WIRELESS POWER TRANSMISSION SYSTEM

• US 20140183967A1
• Filed: 12/27/2013
• Published: 07/03/2014
• Est. Priority Date: 12/27/2012
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: RYU, Young Ho, KWON, Sang Wook, KIM, Ki Young, KIM, Nam Yun, KIM, Dong Zo, PARK, Yun Kwon, SONG, Keum Su, AHN, Chi Hyung, YOON, Chang Wook, CHOI, Jin Sung
• Granted Patent: US 10,290,418 B2
• Time in Patent Office: Days
• US Class Current: 307/104
• CPC Class Codes: B60L 53/126 Methods for pairing a vehicle and a charging station, e.g. establishing a one-to-one relation between a wireless power transmitter and a wireless power receiver
• 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 2310/48 for electric vehicles [EV] or hybrid vehicles [HEV]
• 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: 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

Abstract

A resonant apparatus in a wireless power transmission system, includes a main resonant unit configured to form magnetic resonant coupling between the resonant apparatus and a resonator. The resonant apparatus further includes a field guiding resonant unit configured to focus a magnetic field on an internal portion of the main resonant unit, and a field additive resonant unit configured to adjust a magnitude of a magnetic field formed between the main resonant unit and the field guiding resonant unit.

Claims

1. A resonant apparatus in a wireless power transmission system, the resonant apparatus comprising:

a main resonant unit configured to form magnetic resonant coupling between the resonant apparatus and a resonator;

a field guiding resonant unit configured to focus a magnetic field on an internal portion of the main resonant unit; and

a field additive resonant unit configured to adjust a magnitude of a magnetic field formed between the main resonant unit and the field guiding resonant unit.

2. The resonant apparatus of claim 1, wherein:

the field guiding resonant unit is disposed in the internal portion of the main resonant unit; and

the field additive resonant unit is disposed between the main resonant unit and the field guiding resonant unit.

3. The resonant apparatus of claim 1, wherein a resonant frequency of the field guiding resonant unit is controlled by a controller.

4. The resonant apparatus of claim 1, wherein a resonant frequency of the field guiding resonant unit is greater than or equal to an operating frequency of the resonant apparatus.

5. The resonant apparatus of claim 1, wherein:

the field additive resonant unit comprises sub-resonant units; and

each of the sub-resonant units is turned ON and OFF by a controller.

6. The resonant apparatus of claim 5, wherein the controller is configured to:

detect a misalignment between the main resonant unit and the resonator; and

control an entirety or a portion of the sub-resonant units to be turned ON or OFF, based on the misalignment.

7. The resonant apparatus of claim 6, wherein the controller is configured to:

detect a portion of the resonant apparatus that needs an enhancement of a magnetic field based on the misalignment; and

control a switch of a sub-resonant unit disposed in the portion, among the sub-resonant units, to be turned OFF.

8. The resonant apparatus of claim 6, wherein the controller is configured to:

detect a portion of the resonant apparatus that needs a cancellation of a magnetic field based on the misalignment; and

control a switch of a sub-resonant unit disposed in the portion, among the sub-resonant units, to be turned ON.

9. The resonant apparatus of claim 5, wherein each of the sub-resonant units comprises a capacitor and a switch connected in parallel to the capacitor.

10. The resonant apparatus of claim 5, wherein the controller is configured to:

receive state information from a wireless power receiver; and

determine an amount of power to be transmitted by the resonant apparatus, and whether each of the sub-resonant units is to be turned ON or OFF, based on the state information.

11. The resonant apparatus of claim 10, wherein the state information comprises information of an amount of current or power received by the wireless power receiver through the magnetic resonant coupling.

12. The resonant apparatus of claim 1, wherein each of the main resonant unit and the field guiding resonant unit comprises a circular loop or a rectangular loop.

13. The resonant apparatus of claim 1, wherein the field additive resonant unit comprises circular loop conductors connected to the main resonant unit.

14. The resonant apparatus of claim 1, wherein:

the field guiding resonant unit and the field additive resonant unit comprises a loop in which ends of the field guiding resonant unit are connected to ends of the field additive resonant unit; and

a width of the field guiding resonant unit is narrower than a width of the field additive resonant unit.

15. A method of controlling a resonance in a wireless power transmission system, the method comprising:

forming magnetic resonant coupling between a resonant apparatus and a resonator;

detecting a misalignment between the resonant apparatus and the resonator; and

controlling an entirety or a portion of sub-resonant units of the resonant apparatus to be turned ON or OFF, based on the misalignment.

16. The method of claim 15, wherein the controlling comprises:

receiving information of an amount of current or power received by a wireless power receiver through the magnetic resonant coupling, periodically; and

determining an amount of power to be transmitted by the resonant apparatus, and whether each of the sub-resonant units is to be turned ON or OFF, based on the information.

17. The method of claim 15, wherein the controlling comprises:

detecting a portion of the resonant apparatus that needs an enhancement of a magnetic field based on the misalignment; and

controlling a switch of a sub-resonant unit disposed in the portion, among the sub-resonant units, to be turned OFF.

18. The method of claim 15, wherein the controlling comprises:

detecting a portion of the resonant apparatus that needs a cancellation of a magnetic field based on the misalignment; and

controlling a switch of a sub-resonant unit disposed in the portion, among the sub-resonant units, to be turned ON.

19. A controller comprising:

a processor configured to

detect a misalignment between a resonant apparatus and a resonator, and

control each of sub-resonant units of the resonant apparatus to be turned ON and OFF based on the misalignment.

20. The controller of claim 19, wherein the resonant apparatus comprises:

a main resonant unit configured to form magnetic resonant coupling between the resonant apparatus and the resonator;

a field guiding resonant unit configured to focus a magnetic field on an internal portion of the main resonant unit; and

the sub-resonant units configured to adjust a magnetic field formed between the main resonant unit and the field guiding resonant unit.