System and method for prevention of wireless charging cross connection

• US 9,762,085 B2
• Filed: 06/23/2015
• Issued: 09/12/2017
• 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
• Application Number:
  US14/747,311
• Publication Number:
  US 20160099604A1
• Time in Patent Office: 812 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 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 transmitted power level of the wireless power transmitter to at least one predetermined level indicative of at least one saturation condition.

2. The wireless charger of claim 1, wherein said initiating the disconnection is further based at least in part on a comparison of the detected transmitted power level to a requested change of the transmitted power.

3. The wireless charger of claim 2, wherein the requested change of the transmitted power corresponds to at least one of:

a request for an increased level of power when the at least one saturation condition is indicative of a maximum allowable transmitter power level;

or a request for a decreased level of power when the at least one saturation condition is indicative of a minimum allowable transmitter power level.

4. The wireless charger of claim 1, wherein the controller is further configured to detect the transmitted power level and to compare the detected transmitted power level to the at least one predetermined level indicative of the at least one saturation condition.

5. The wireless charger of claim 1, wherein the at least one predetermined level comprises at least one of a first predetermined level indicative of a maximum power saturation condition or a second predetermined level indicative of a minimum power saturation condition.

6. The wireless charger of claim 1, wherein the controller is further configured to detect whether the at least one saturation condition exists, and to initiate the disconnection after detecting that the at least one saturation condition exists.

7. The wireless charger of claim 6, wherein the controller is further configured to initiate the disconnection after detecting that the at least one saturation condition persists for a predetermined period of time.

8. The wireless charger of claim 7, wherein the controller is further configured to distinguish between a cross connection condition and a non-cross connection condition in which the at least one saturation condition exists and the controller is further configured to not initiate a disconnection of the wireless transmitter from the chargeable device if the non-cross connection condition exists.

9. The wireless charger of claim 1, wherein the at least one predetermined level comprises at least one of a first predetermined level indicative of a maximum power saturation condition or a second predetermined level indicative of a minimum power saturation condition, the maximum power saturation condition comprising the transmitted power being at or above a first power level and the minimum power saturation condition comprising the transmitted power being at or below a second power level.

10. The wireless charger of claim 9, wherein the first power level corresponds to a maximum allowable level and the second power level corresponds to a minimum allowable level.

11. The wireless charger of claim 1, wherein the controller is further configured to change the transmitted power by a predetermined amount for a predetermined period of time, and said initiating the disconnection is further based at least in part on a comparison of a detected change of the detected transmitted power level to the predetermined amount.

12. The wireless charger of claim 11, wherein the controller is further configured to select the predetermined amount and the period of time to avoid adversely affecting the transfer of power from the wireless transmitter to chargeable devices properly connected to the wireless transmitter.

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

detecting a transmitted power level of the wireless charger when generating a wireless field;

comparing the detected transmitted power level to at least one predetermined level indicative of at least one saturation condition; and

initiating a disconnection of a communication link, different than the wireless field, between the wireless charger and the chargeable device based at least in part on whether the at least one saturation condition exists.

14. The method of claim 13, wherein said initiating the disconnection is further based at least in part on a comparison of the detected transmitted power level to a requested change of the transmitted power from the chargeable device.

15. The method of claim 14, wherein the requested change of the transmitted power corresponds to at least one of:

a request for an increased level of power when the at least one saturation condition is indicative of a maximum allowable transmitter power level;

or a request for a decreased level of power when the at least one saturation condition is indicative of a minimum allowable transmitter power level.

16. The method of claim 13, wherein the at least one predetermined level comprises at least one of a first predetermined level indicative of a maximum power saturation condition or a second predetermined level indicative of a minimum power saturation condition.

17. The method of claim 16, wherein the maximum power saturation condition comprises the transmitted power being at or above a maximum allowable level and the minimum power saturation condition comprises the transmitted power being at or below a minimum allowable level.

18. The method of claim 13, wherein said initiating the disconnection comprises forcing the disconnection after detecting that the at least one saturation condition exists.

19. The method of claim 18, wherein said initiating the disconnection further comprises forcing the disconnection after detecting that the at least one saturation condition persists for a predetermined amount of time.

20. The method of claim 13, further comprising distinguishing between a cross connection condition and a non-cross connection condition in which the at least one saturation condition exists and not initiating a disconnection of the wireless charger from the chargeable device if the non-cross connection condition exists.

21. The method of claim 13, further comprising changing the transmitted power by a predetermined amount for a predetermined period of time and comparing a detected change of the detected transmitted power level to the predetermined amount, wherein said initiating the disconnection is further based at least in part on a result of said comparing the detected change of the detected transmitted power level to the predetermined amount.

22. The method of claim 21, further comprising selecting the predetermined amount and the period of time to avoid adversely affecting the transfer of power from the wireless charger to chargeable devices properly connected to the wireless charger.

23. The method of claim 13, wherein said detecting the transmitted power level, said comparing the detected transmitted power level, and said initiating the disconnection are performed by the wireless charger.

24. The method of claim 13, wherein said detecting the transmitted power level, said comparing the detected transmitted power level, and said initiating the disconnection are performed by the chargeable device.

25. The method of claim 13, wherein at least one of said detecting the transmitted power level, said comparing the detected transmitted power level, and said initiating the disconnection is performed by the wireless charger, and at least one other of said detecting the transmitted power level, said comparing the detected transmitted power level, and said initiating the disconnection is performed by the chargeable device.

26. A wireless charger comprising:

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

means for communicating with a chargeable device; and

means for facilitating 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 transmitted power level of the wireless charger to at least one predetermined level indicative of at least one saturation condition.

27. The wireless charger of claim 26, wherein the means for generating a wireless charging field comprises a wireless power antenna and a wireless power transmitter coupled to the wireless power antenna, and wherein the means for communicating with the chargeable device comprises a communication antenna and a transceiver coupled to the communication antenna.

28. The wireless charger of claim 26, wherein the means for facilitating avoidance of cross connection of the chargeable device with the wireless charger and at least one other wireless charger comprise a controller and the controller is configured to detect the transmitted power level and to compare the detected transmitted power level to the at least one predetermined level indicative of the at least one saturation condition.

29. The wireless charger of claim 26, wherein the means for facilitating avoidance of cross connection initiates the disconnection further based at least in part on a comparison of the detected transmitted power level to a requested change of the transmitted power from the chargeable device.

30. A non-transitory computer-readable medium comprising code that, when executed, causes a wireless charger to:

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

communicate with a chargeable device; and

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 transmitted power level of the wireless charger to at least one predetermined level indicative of at least one saturation condition.