Wireless power transmission system, and method of controlling resonance impedance and resonance frequency of wireless power transmission system

• US 9,496,718 B2
• Filed: 05/04/2012
• Issued: 11/15/2016
• Est. Priority Date: 05/11/2011
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Kim, Nam Yun, Kwon, Sang Wook, Park, Yun Kwon, Yoon, Chang Wook
• Primary Examiner(s): Fureman, Jared
• Assistant Examiner(s): Pham, Duc M
• Application Number:
  US13/463,860
• Publication Number:
  US 20120286582A1
• Time in Patent Office: 1,656 Days
• Field of Search: 307/104
• US Class Current: 1/1
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/50 using additional energy repeaters between transmitting devices and receiving devices
• 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: H02J 7/00 Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
• CPC Class Codes: H02J 7/00034 Charger exchanging data with an electronic device, i.e. telephone, whose internal battery is under charge

Abstract

A wireless power transmission system, and a method for controlling a resonance impedance and a resonance frequency of the wireless power transmission system are provided. According to one aspect, a wireless power transmitter may include: a power generator configured to generate tracking power using a resonance frequency, the tracking power being used for a resonance frequency tracking; a source resonator configured to transmit the tracking power to a target resonator; a mismatching detector configured to detect a mismatching between the target resonator and the source resonator; and a controller configured to adjust the resonance frequency, or an impedance of a repeater resonator when the mismatching is detected, the repeater resonator being used to perform an impedance matching between the target resonator and the source resonator.

Claims

1. A wireless power transmitter comprising:

a power generator configured to generate a first power for a resonance impedance tracking or a resonance frequency tracking, and a second power for charging target devices;

a source resonator configured to transmit the first power to a target resonator;

a communication unit configured to receive, from a wireless power receiver, information on an amount of a received power according to transmission of the first power; and

a controller configured to detect a mismatching between the target resonator and the source resonator, based on an amount of the first power, and the received information, and to adjust a resonance frequency, or an impedance of a repeater resonator when the mismatching is detected, the repeater resonator being used to perform an impedance matching between the target resonator and the source resonator, and

wherein the source resonator is further configured to transmit the second power to the target resonator based on the adjusted resonance frequency, or the adjusted impedance of the repeater resonator.

2. The wireless power transmitter of claim 1, wherein, when a ratio of the amount of the first power and the amount of the received power is less than a predetermined reference value, the controller determines that the mismatching is detected.

9. The wireless power transmitter of claim 1, further comprising:

the repeater resonator positioned between the source resonator and the target resonator.

10. The wireless power transmitter of claim 9, wherein the repeater resonator increases a range of the magnetic coupling formed between the source resonator and the target resonator.

11. The wireless poer transmitter of claim 9, wherein the repeater resonator performs the impedance matching between the target resonator and the source resonator.

12. The wireless power transmitter of claim 9, wherein the repeater resonator in installed inside or outside the wireless power transmitler.

13. The wireless power transmitter of claim 9, wherein the repeater resonator comprises an impedance adjusting unit for the impedance matching between the target resonator and the source resonator.

3. A method of controlling a resonance frequency of a wireless power transmission system, the method comprising:

generating a first power for a resonance frequency tracking and a second power for charging target devices;

transmitting the first power to a target resonator;

receiving, from a wireless power receiver, information on an amount of received power;

detecting a mismatching between the target resonator and a source resonator, based on an amount of the first power and the received information;

adjusting the resonance frequency based on the mismatching; and

transmitting the second power to the target resonator, based on the adjusted resonance frequency.

4. The method of claim 3, wherein the detecting comprises determining that the mismatching is detected, when a ratio of the amount of the first power and the amount of the received power is less than a predetermined reference value.

5. The method of claim 3, wherein the adjusting comprises adjusting the resonance frequency to one or more of a plurality of candidate resonance frequencies in sequence, and tracking a candidate resonance frequency where the mismatching is not detected among the plurality of candidate resonance frequencies.

6. A method of controlling a resonance impedance of a wireless power transmission system, the method comprising:

generating a first power for a resonance impedance tracking and a second power for charging target devices;

transmitting the first power to a target resonator;

receiving, from a wireless power receiver, information on an amount of a received power;

detecting a mismatching between the target resonator and a source resonator, based on an amount of the first power and the received information;

adjusting an impedance of a repeater resonator based on the mismatching; and

transmitting the second power to the target resonator, via the repeater resonator having the adjusted impedance,

wherein the repeater resonator being used to perform an impedance matching between the target resonator and the source resonator.

7. The method of claim 6, wherein the detecting comprises determining that the mismatching is detected, when a ratio of the amount of the first power and the amount of the received power according to transmission of the first power is less than a predetermined reference value.

8. The method of claim 6, wherein the adjusting comprises adjusting the impedance of the repeater resonator to one or more of a plurality of candidate impedances in sequence, and tracking a candidate impedance where the mismatching is not detected among the plurality of candidate impedances.