WIRELESS POWER TRANSMISSION APPARATUS AND METHOD

• US 20170141614A1
• Filed: 05/16/2016
• Published: 05/18/2017
• Est. Priority Date: 11/17/2015
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: LEE, Jaechun, KIM, Sang Joon
• Granted Patent: US 10,103,580 B2
• Time in Patent Office: Days
• 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 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 50/90 involving detection or optimisation of position, e.g. alignment
• CPC Class Codes: H04B 5/263 Multiple coils at either side
• CPC Class Codes: H04B 5/79 for data transfer in combination with power transfer
• 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 90/14 Plug-in electric vehicles

Abstract

A wireless power transmission method includes operating at least one source resonator among a plurality of source resonators; detecting a waveform while the at least one source resonator resonates; determining, based on the detected waveform, a source resonator for wireless power transmission; and wirelessly transmitting power to a target resonator using the determined source resonator.

Claims

1. A wireless power transmission method comprising:

operating at least one source resonator among a plurality of source resonators;

detecting a waveform while the at least one source resonator resonates;

determining, based on the detected waveform, a source resonator for wireless power transmission; and

wirelessly transmitting power to a target resonator using the determined source resonator.

2. The wireless power transmission method of claim 1, wherein the operating comprises:

supplying power to the at least one source resonator during a first supply time; and

disconnecting one end of the at least one source resonator in response to the first supply time having elapsed.

3. The wireless power transmission method of claim 2, wherein the supplying comprises electrically connecting the at least one source resonator to a direct current (DC) source during the first supply time;

and

the disconnecting comprises disconnecting an electrical connection between the at least one source resonator and the DC source in response to the first supply time having elapsed.

4. The wireless power transmission method of claim 1, wherein the detecting comprises:

detecting an envelope of an electric signal produced by resonance occurring in the at least one source resonator during a detection time; and

connecting both ends of the at least one source resonator to a ground in response to the detection time having elapsed.

5. The wireless power transmission method of claim 1, wherein the determining comprises determining the source resonator for wireless power transmission based on an attenuation level of the detected waveform.

6. The wireless power transmission method of claim 1, wherein the wirelessly transmitting comprises:

supplying power to the determined source resonator during a second supply time;

disconnecting one end of the determined source resonator in response to the second supply time having elapsed; and

connecting both ends of the determined source resonator to a ground in response to a transmission time having elapsed after a point in time at which the one end of the determined source resonator is disconnected.

7. The wireless power transmission method of claim 1, wherein the operating comprises:

selecting the at least one source resonator from the plurality of source resonators according to a preset order; and

operating the selected source resonator; and

the detecting comprises detecting waveforms for the plurality of source resonators in the preset order.

8. The wireless power transmission method of claim 7, wherein the plurality of source resonators are arranged in a lattice pattern;

and

the selecting comprises selecting a source resonator corresponding to a single row or a single column in the lattice pattern.

9. The wireless power transmission method of claim 7, wherein the plurality of source resonators are classified into a plurality of groups;

and

the selecting comprises selecting a source resonator corresponding to a single group among the plurality of groups.

10. A non-transitory computer-readable storage medium storing instructions to cause computing hardware to perform the method of claim 1.

11. A wireless power transmission apparatus comprising:

a plurality of source resonators;

a switch configured to operate at least one source resonator among the plurality of source resonators by connecting the at least one source resonator to a power source;

a detector configured to detect a waveform while the at least one source resonator resonates; and

a switch controller configured to;

determine, based on the detected waveform, a source resonator for wireless power transmission, and

control the switch to wirelessly transmit power to a target resonator using the determined source resonator.

12. The wireless power transmission apparatus of claim 11, wherein the switch comprises:

a first switch configured to selectively connect one end of each of source resonators connected together at the one end among the plurality of source resonators to the power source under control of the switch controller; and

a second switch configured to selectively connect another end of each of source resonators connected together at the other end among the plurality of source resonators to a ground under control of the switch controller.

13. The wireless power transmission apparatus of claim 11, wherein each of the plurality of source resonators comprises:

a capacitor;

an inductor; and

a diode configured to prevent power received by the source resonator from flowing to another one of the source resonators.

14. The wireless power transmission apparatus of claim 11, wherein the plurality of source resonators are arranged at intersection points at which a plurality of parallel first axes intersect a plurality of parallel second axes;

and

the switch comprises;

a first switch configured to connect one end of each of source resonators arranged along a single first axis among the first axes to the power source; and

a second switch configured to connect one end of each of source resonators arranged along a single second axis among the second axes to a ground.

15. The wireless power transmission apparatus of claim 11, wherein source resonators having one end connected together among the plurality of source resonators are arranged in a zigzag pattern;

and

source resonators having another end connected together among the plurality of source resonators are arranged in a line.

16. The wireless power transmission apparatus of claim 11, wherein the switch controller is further configured to:

control the switch to connect one end of the at least one source resonator to the power source during a first supply time, and

disconnect the one end of the at least one source resonator from the power source in response to the first supply time having elapsed.

17. The wireless power transmission apparatus of claim 11, wherein the detector is further configured to detect, at one end of the at least one source resonator, an envelope of an electric signal produced by resonance occurring in the at least one source resonator during a detection time;

and

the switch controller is further configured to control the switch to connect both ends of the at least one source resonator to a ground in response to the detection time having elapsed.

18. The wireless power transmission apparatus of claim 11, wherein the switch controller is further configured to determine, based on an attenuation level of the detected waveform, the source resonator for wireless power transmission.

19. The wireless power transmission apparatus of claim 11, wherein the switch controller is further configured to:

control the switch to connect one end of the determined source resonator to the power source during a second supply time,

disconnect the one end of the determined source resonator from the power source in response to the second supply time having elapsed, and

connect both ends of the determined source resonator to a ground in response to a transmission time having elapsed after a point in time at which the one end of the determined source resonator is disconnected from the power source.

20. The wireless power transmission apparatus of claim 11, wherein the plurality of source resonators are classified into a plurality of groups;

and

the switch controller is further configured to;

sequentially select the plurality of groups,

control the switch to operate source resonators corresponding to a selected group, and

sequentially acquire waveforms for the plurality of source resonators.