WIRELESS POWER TRANSMISSION SYSTEM AND METHOD BASED ON IMPEDANCE MATCHING CONDITION

• US 20130113298A1
• Filed: 11/07/2012
• Published: 05/09/2013
• Est. Priority Date: 11/08/2011
• Status: Abandoned Application

• 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, YOON, Chang Wook, CHOI, Jin Sung, SONG, Keum Su
• Application Number:
  US13/671,027
• Publication Number:
  US 20130113298A1
• Time in Patent Office: Days
• US Class Current: 307/104
• CPC Class Codes: B60L 2210/30 AC to DC converters
• CPC Class Codes: B60L 2210/40 DC to AC converters
• 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: B60L 53/36 by positioning the vehicle
• CPC Class Codes: B60L 53/38 specially adapted for charging by inductive energy transfer
• CPC Class Codes: B60L 53/65 involving identification of vehicles or their battery types
• 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 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 50/90 involving detection or optimisation of position, e.g. alignment
• CPC Class Codes: H02J 7/00034 Charger exchanging data with an electronic device, i.e. telephone, whose internal battery is under charge
• 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 10/72 Electric energy management in electromobility
• 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
• CPC Class Codes: Y02T 90/167 Systems integrating technologies related to power network operation and communication or information technologies for supporting the interoperability of electric or hybrid vehicles, i.e. smartgrids as interface for battery charging of electric vehicles [EV] or hybrid vehicles [HEV]
• CPC Class Codes: Y04S 30/14 Details associated with the interoperability, e.g. vehicle recognition, authentication, identification or billing

Abstract

A wireless power transmission system and a method based on an impedance matching condition are provided. A source device of the wireless power transmission system, includes a power converter configured to generate power. The source device further includes a resonator configured to transmit the power to a target device. A ratio of an input impedance of the resonator to an output impedance of the power converter is less than a reference value.

Claims

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

a power converter configured to generate power; and

a resonator configured to transmit the power to a target device,

wherein a ratio of an input impedance of the resonator to an output impedance of the power converter is less than a reference value.

2. The source device of claim 1, wherein:

the reference value is determined based on a power transmission efficiency of the wireless power transmission system.

3. The source device of claim 1, further comprising:

a matching network configured to perform impedance matching between the resonator and the target device based on a change in an impedance between the resonator and the target device.

4. The source device of claim 1, further comprising:

a matching network configured to perform impedance matching between the resonator and the target device to maintain a value of a voltage standing wave ratio (VSWR) between the resonator and the target device to be less than 2.

5. The source device of claim 1, wherein:

the reference value is greater than 0.5, and is less than 2.

6. The source device of claim 1, further comprising:

a matching network configured to perform impedance matching between the resonator and the target device,

wherein

in an initial condition, the matching network is further configured to maintain the input impedance of the resonator in a first quadrant or a fourth quadrant of a Smith chart, and

the initial condition indicates that the target device is recognized to be in an open state.

7. A source device of a wireless power transmission system, the source device comprising:

a power converter configured to generate a power;

a resonator configured to transmit the power to target devices; and

a matching network configured to perform impedance matching between the resonator and the target devices,

wherein a ratio of an input impedance of the resonator to an output impedance of the power converter is less than a reference value.

8. A target device of a wireless power transmission system, the target device comprising:

a resonator configured to receive and output power from a source device; and

a rectification unit configured to rectify the power output from the resonator,

wherein a ratio of an output impedance of the resonator to an input impedance of the rectification unit is less than a reference value.

9. The target device of claim 8, wherein:

the reference value is determined based on a power transmission efficiency of the wireless power transmission system.

10. The target device of claim 8, further comprising:

a matching network configured to perform impedance matching between the resonator and the source device based on a change in an impedance between the resonator and the source device.

11. The target device of claim 8, further comprising:

a matching network configured to perform impedance matching between the resonator and the source device to maintain a value of a voltage standing wave ratio (VSWR) between the resonator and the source device to be less than 2.

12. The target device of claim 8, wherein:

the reference value is greater than 0.5, and is less than 2.

13. A power transmission method of a wireless power transmission system, the power transmission method comprising:

generating, by a power converter, a power; and

transmitting, by a resonator, the power to a target device,

wherein a ratio of an input impedance of the resonator to an output impedance of the power converter is less than a reference value.

14. The power transmission method of claim 13, further comprising:

performing impedance matching between the resonator and the target device based on a change in an impedance between the resonator and the target device.

15. The power transmission method of claim 13, further comprising:

performing impedance matching between the resonator and the target device to maintain a value of a voltage standing wave ratio (VSWR) between the resonator and the target device to be less than 2.

16. The power transmission method of claim 13, wherein:

the reference value is greater than 0.5, and is less than 2.

17. The power transmission method of claim 13, further comprising:

performing impedance matching between the resonator and the target device; and

maintaining, in an initial condition, the input impedance of the resonator in a first quadrant or a fourth quadrant of a Smith chart,

wherein the initial condition indicates that the target device is recognized to be in an open state.

18. A power transmission method of a wireless power transmission system, the power transmission method comprising:

generating, by a power converter, a power;

transmitting, by a resonator, the power to target devices; and

performing impedance matching between the resonator and the target devices,

wherein a ratio of an input impedance of the resonator to an output impedance of the power converter is less than a reference value.

19. A power reception method of a wireless power transmission system, the power reception method comprising:

receiving, by a resonator, a power from a source device; and

rectifying, by a rectification unit, the received power,

wherein a ratio of an output impedance of the resonator to an input impedance of the rectification unit is less than a reference value.

20. The power reception method of claim 19, further comprising:

performing impedance matching between the resonator and the source device based on a change in an impedance between the resonator and the source device.

21. The power reception method of claim 19, further comprising:

performing impedance matching between the resonator and the source device to maintain a value of a voltage standing wave ratio (VSWR) between the resonator and the source device to be less than 2.

22. The power reception method of claim 19, wherein:

the reference value is greater than 0.5, and is less than 2.