Apparatus and method for resonance in wireless power transmission system

• US 10,290,418 B2
• Filed: 12/27/2013
• Issued: 05/14/2019
• 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
• Primary Examiner(s): Amrany, Adi
• Application Number:
  US14/142,571
• Publication Number:
  US 20140183967A1
• Time in Patent Office: 1,964 Days
• Field of Search: 307104
• 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 resonator configured to form magnetic resonant coupling between the resonant apparatus and a target resonator of a wireless power receiver;

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

a field additive resonant unit configured to adjust a magnitude of a magnetic field formed between the main resonator and the field guiding resonant unit, and comprising a plurality of sub-resonant units; and

a controller is configured to;

receive state information from the wireless power receiver,

detect a reflected wave of a charging power and misalignment between the main resonator and the target resonator based on the detected reflected wave, and

control two or more of the plurality of sub-resonant units to be turned ON or OFF, based on the detected misalignment and/or the received state information, wherein the controller turns ON one or more sub-resonant units, among the sub-resonant units, disposed in a portion in which the resonant apparatus overlaps the target resonator, and turn OFF a remained of the sub-resonant units,

wherein the state information includes efficiency information of power transmission and the efficiency information is calculated based on a ratio of an amount of received power to an amount of transmitted power.

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 each of the sub-resonant units comprises a capacitor and a switch connected in parallel to the capacitor.

6. 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.

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

8. 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.