System and method for prevention of wireless charging cross connection

• US 10,270,277 B2
• Filed: 09/11/2017
• Issued: 04/23/2019
• Est. Priority Date: 10/03/2014
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Von Novak, III, William Henry, Shareef, Ali Abdullah, Tsai, Mike Yung-Ho
• Primary Examiner(s): Williams, Arun C
• Application Number:
  US15/701,270
• Publication Number:
  US 20180069419A1
• Time in Patent Office: 589 Days
• Field of Search: 320108
• CPC Class Codes: H01M 10/4257 Smart batteries, e.g. electronic circuits inside the housing of the cells or batteries
• 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: H02J 7/0042 characterised by the mechanical construction
• CPC Class Codes: H04B 5/79 for data transfer in combination with power transfer
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

A system and method for charging a chargeable device is provided. The system can include a wireless charger including a wireless power transmitter d configured to generate a wireless charging field in at least one charging region. The wireless charger further includes a transceiver configured to communicate with the chargeable device. The wireless charger further includes a controller configured to facilitate avoidance of cross connection of the chargeable device with the wireless charger and at least one other wireless charger by initiating a disconnection of a communication link between the wireless charger and the chargeable device based at least in part on a comparison of a detected power level of the wireless charger to a predetermined level indicative of saturation.

Claims

1. A wireless charger for wirelessly charging a chargeable device, the wireless charger comprising:

a wireless power transmitter configured to generate a wireless charging field in at least one charging region;

a transceiver configured to communicate with the chargeable device; and

a controller configured to;

define a time window for receiving data connection requests from the chargeable device, wherein the time window is defined between a first time, after the chargeable device is positioned within the at least one charging region, at which the chargeable device is expected to activate a data connection and a second time after the chargeable device is positioned within the at least one charging region,

receive a request to establish the data connection with the chargeable device,

determine whether the request is received within the time window, and

accept the request to establish the data connection in response to determining that the request is received within the time window.

2. The wireless charger of claim 1, wherein the controller is configured to reject data connection requests that are received outside the time window.

3. The wireless charger of claim 1, wherein the first time is a minimum expected delay between when the chargeable device detects power from the wireless charger and when the chargeable device activates the data connection.

4. The wireless charger of claim 1, wherein the second time is a maximum expected delay between when the chargeable device detects power from the wireless charger and when the chargeable device activates the data connection.

5. The wireless charger of claim 1, wherein the first time is 50 milliseconds (ms) and wherein the second time is 70 ms.

6. The wireless charger of claim 1, further comprising a detection circuit configured to detect whether the chargeable device is positioned within the at least one charging region and wherein the controller is further configured to receive a signal from the detection circuit indicating whether the chargeable device is positioned within the at least one charging region.

7. The wireless charger of claim 6, wherein the controller is further configured to:

determine, based on the signal, whether the chargeable device is positioned within the at least one charging region by comparing the signal to a threshold value, and

delay the time window based on the signal being less than the threshold value by a predetermined time value.

8. The wireless charger of claim 7, wherein the detection circuit is configured to detect whether the chargeable device is positioned within the at least one charging region based on an impedance change of one or more components of the wireless power transmitter and wherein the threshold value is a minimum impedance change of the one or more components of the wireless power transmitter indicative of the chargeable device positioned within the charging region.

9. The wireless charger of claim 7, wherein the predetermined time value is 900 ms.

10. A method of facilitating avoidance of cross connection of a chargeable device in communication with a wireless charger, the method comprising:

generating a wireless charging field in at least one charging region;

defining a time window for receiving data connection requests from the chargeable device, wherein the time window is defined between a first time, after the chargeable device is positioned within the at least one charging region, at which the chargeable device is expected to activate a data connection and a second time after the chargeable device is positioned within the at least one charging region;

receiving a request to establish the data connection with the chargeable device;

determining whether the request is received within the time window; and

accepting the request to establish the data connection in response to determining that the request is received within the time window.

11. The method of claim 10, further comprising rejecting data connection requests that are received outside the time window.

12. The method of claim 10, wherein the first time is a minimum expected delay between when the chargeable device detects power from the wireless charger and when the chargeable device activates the data connection.

13. The method of claim 10, wherein the second time is a maximum expected delay between when the chargeable device detects power from the wireless charger and when the chargeable device activates the data connection.

14. The method of claim 10, wherein the first time is 50 ms and wherein the second time is 70 ms.

15. The method of claim 10, further comprising:

detecting, via a detection circuit, whether the chargeable device is positioned within the at least one charging region; and

receiving a signal from the detection circuit indicating whether the chargeable device is positioned within the at least one charging region.

16. The method of claim 15, further comprising:

determining, based on the signal, whether the chargeable device is positioned within the at least one charging region by comparing the signal to a threshold value; and

delaying the time window based on the signal being less than the threshold value by a predetermined time value.

17. The method of claim 16, wherein the wireless charging field is generated by a wireless power transmitter, wherein detecting whether the chargeable device is positioned within the at least one charging region comprises detecting an impedance change of one or more components of the wireless power transmitter, and wherein the threshold value is a minimum impedance change of the one or more components of the wireless power transmitter indicative of the chargeable device positioned within the charging region.

18. The method of claim 16, wherein the predetermined time value is 900 ms.

19. A wireless charger for wirelessly charging a chargeable device, the wireless charger comprising:

a wireless power transmitter configured to generate a wireless charging field in at least one charging region;

a detection circuit configured to detect whether the chargeable device is positioned within the at least one charging region;

a transceiver configured to communicate with the chargeable device; and

a controller configured to;

define a time window for receiving data connection requests from the chargeable device,

receive a request to establish a data connection with the chargeable device,

determine whether the request is received within the time window,

accept the request to establish the data connection in response to determining that the request is received within the time window,

receive a signal from the detection circuit indicating whether the chargeable device is positioned within the at least one charging region;

determine, based on the signal, whether the chargeable device is positioned within the at least one charging region by comparing the signal to a threshold value, and

delay the time window based on the signal being less than the threshold value by a predetermined time value.

20. The wireless charger of claim 19, wherein the detection circuit is configured to detect whether the chargeable device is positioned within the at least one charging region based on an impedance change of one or more components of the wireless power transmitter and wherein the threshold value is a minimum impedance change of the one or more components of the wireless power transmitter indicative of the chargeable device positioned within the charging region.