Systems and methods of object detection using one or more sensors in wireless power charging systems

• US 10,483,768 B2
• Filed: 01/16/2018
• Issued: 11/19/2019
• Est. Priority Date: 09/16/2015
• Status: Active Grant

• Current Assignee: Energous Corporation
• Original Assignee: Energous Corporation
• Inventors: Bell, Douglas, Leabman, Michael A.
• Primary Examiner(s): Lin, Sun J
• Application Number:
  US15/872,920
• Publication Number:
  US 20180262014A1
• Time in Patent Office: 672 Days
• Field of Search: 320108
• CPC Class Codes: G06F 18/22 Matching criteria, e.g. proximity measures
• CPC Class Codes: G06F 18/251 of input or preprocessed data
• CPC Class Codes: G06V 10/143 Sensing or illuminating at different wavelengths
• CPC Class Codes: G06V 10/75 Organisation of the matching processes, e.g. simultaneous or sequential comparisons of image or video features; Coarse-fine approaches, e.g. multi-scale approaches; using context analysis; Selection of dictionaries
• CPC Class Codes: G06V 10/803 of input or preprocessed data
• CPC Class Codes: G06V 20/00 Scenes; Scene-specific elements control of digital cameras H04N23/60
• CPC Class Codes: G06V 30/224 of printed characters having additional code marks or containing code marks
• CPC Class Codes: G06V 40/103 Static body considered as a whole, e.g. static pedestrian or occupant recognition
• CPC Class Codes: H02J 50/15 using ultrasonic waves
• CPC Class Codes: H02J 50/20 using microwaves or radio frequency waves
• CPC Class Codes: H02J 50/60 responsive to the presence of foreign objects, e.g. detection of living beings
• 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: H04B 5/77 for interrogation
• CPC Class Codes: H04B 5/79 for data transfer in combination with power transfer
• CPC Class Codes: H04B 7/0617 for beam forming
• CPC Class Codes: H04N 5/04 Synchronising for television systems using pulse code modulation H04N7/56
• CPC Class Codes: H04N 7/18 Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast

Abstract

Embodiments disclosed herein relate to wireless charging systems and method of transmitting power waves. An exemplary method includes receiving, from one or more first sensors, first data of a transmission field. After receiving the first data, the method includes determining whether a path between a wireless power receiver located in the transmission field and a first wireless power transmitter is unobstructed based, at least in part, on the first data. In accordance with a determination that the path between the wireless power receiver and the first wireless power transmitter is unobstructed, the method includes transmitting, by the first wireless power transmitter, electromagnetic wireless power transmission waves to the wireless power receiver. The wireless power receiver uses energy from at least some of the electromagnetic wireless power transmission waves to power or charge an electronic device coupled to the wireless power receiver.

Claims

1. A method of wirelessly delivering power to an electronic device, the method comprising:

receiving, from one or more first sensors, first data of a transmission field, the first data identifying at least one object within the transmission field, wherein a first wireless power transmitter is configured to transmit electromagnetic wireless power transmission waves to a wireless power receiver located in the transmission field;

after receiving the first data, determining whether a path between the wireless power receiver located in the transmission field and the first wireless power transmitter is unobstructed by the at least one object based, at least in part, on the first data; and

in accordance with a determination that the path between the wireless power receiver and the first wireless power transmitter is unobstructed by the at least one object;

instructing the first wireless power transmitter to transmit the electromagnetic wireless power transmission waves to the wireless power receiver using the path, wherein the wireless power receiver uses energy from at least some of the electromagnetic wireless power transmission waves to power or charge an electronic device coupled to the wireless power receiver.

2. The method of claim 1, further comprising:

receiving, from one or more second sensors distinct from the one or more first sensors, second data of the transmission field, the second data identifying the at least one object within the transmission field,

wherein the determining whether a path between the wireless power receiver and the first wireless power transmitter is unobstructed by the at least one object is further based, at least in part, on the second data.

3. The method of claim 2, wherein:

the one or more first sensors capture a first perspective of the transmission field, and

the one or more second sensors capture a second perspective, distinct from the first perspective, of the transmission field.

4. The method of claim 3, further comprising:

generating a model of the transmission field using the first data and the second data, the model including the at least one object,

wherein the determining whether a path between the wireless power receiver and the first wireless power transmitter is unobstructed by the at least one object is determined using the model.

5. The method of claim 1, further comprising:

before the determination that a path between the first wireless power transmitter and the wireless power receiver is unobstructed, determining that another path between the wireless power receiver located in the transmission field and a second wireless power transmitter, distinct from the first wireless power transmitter, is obstructed by the at least one object based, at least in part, on the first data.

6. The method of claim 5, wherein the second wireless power transmitter transmits the electromagnetic wireless power transmission waves into the transmission field at a different angle relative to an angle at which the electromagnetic wireless power transmission waves are transmitted into the transmission field by the first wireless power transmitter.

7. The method of claim 6, wherein the first wireless power transmitter and the second wireless power transmitter transmit respective electromagnetic wireless power transmission waves to the wireless power receiver simultaneously.

8. The method of claim 5, further comprising:

receiving, from one or more second sensors distinct from the one or more first sensors, second data of the transmission field,

wherein the determining that another path between the wireless power receiver and a second wireless power transmitter is obstructed is further based, at least in part, on the second data.

9. The method of claim 8, wherein:

the one or more first sensors are part of the first wireless power transmitter, and

the one or more second sensors are part of the second wireless power transmitter.

10. The method of claim 1, wherein the one or more first sensors are selected from a group consisting of infrared cameras, thermal cameras, visible light cameras, and ultrasound sensors.

11. The method of claim 1, wherein the first data is selected from a group consisting of image data, video data, thermal data, and ultrasound data.

12. The method of claim 1, wherein the first data identifies a plurality of objects in the transmission field.

13. The method of claim 1, wherein the first wireless power transmitter is a first far-field wireless power transmitter.

14. The method of claim 1, wherein:

the receiving, the determining, and the instructing are performed by one or more processors of the first wireless power transmitter.

15. The method of claim 1, wherein the receiving, the determining, and the instructing are performed by one or more processors that are separate from the first wireless power transmitter, and the one or more processors are in communication with the first wireless power transmitter.

16. The method of claim 1, wherein the transmission field is shared by a plurality of wireless power transmitters, including the first wireless power transmitter.

17. The method of claim 16, wherein each wireless power transmitter of the plurality of wireless power transmitters includes one or more sensors that monitor the shared transmission field.

18. A wireless power transmission system comprising:

a first wireless power transmitter configured to transmit electromagnetic wireless power transmission waves to a wireless power receiver located in a transmission field;

one or more first sensors configured to capture first data of the transmission field, the first data identifying at least one object within the transmission field; and

a controller configured to;

determine whether a path between the wireless power receiver located in the transmission field and the first wireless power transmitter is unobstructed by the at least one object based, at least in part, on the first data; and

in accordance with a determination that the path between the wireless power receiver and the first wireless power transmitter is unobstructed by the at least one object;

instruct the first wireless power transmitter to transmit the electromagnetic wireless power transmission waves to the wireless power receiver using the path, wherein the wireless power receiver uses energy from at least some of the electromagnetic wireless power transmission waves to power or charge an electronic device coupled to the wireless power receiver.

19. An electronic device for managing a wireless power transmission system, the electronic device comprising:

one or more processors; and

memory storing one or more programs for execution by the one or more processors, the one or more programs including instructions for;

receiving, from one or more first sensors, first data of a transmission field, the first data identifying at least one object within the transmission field, wherein a first wireless power transmitter is configured to transmit electromagnetic wireless power transmission waves to a wireless power receiver located in the transmission field;

after receiving the first data, determining whether a path between the wireless power receiver located in the transmission field and the first wireless power transmitter is unobstructed by the at least one object based, at least in part, on the first data; and

in accordance with a determination that the path between the wireless power receiver and the first wireless power transmitter is unobstructed by the at least one object;

instructing the first wireless power transmitter to transmit the electromagnetic wireless power transmission waves to the wireless power receiver using the path, wherein the wireless power receiver uses energy from at least some of the electromagnetic wireless power transmission waves to power or charge an electronic device coupled to the wireless power receiver.