Resolving communcations in a wireless power system with co-located transmitters

• US 9,831,705 B2
• Filed: 03/01/2013
• Issued: 11/28/2017
• Est. Priority Date: 12/12/2012
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Von Novak, William H., Kallal, Edward
• Primary Examiner(s): Grant, Robert
• Application Number:
  US13/783,151
• Publication Number:
  US 20140159651A1
• Time in Patent Office: 1,733 Days
• Field of Search: 320108
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/60 responsive to the presence of foreign objects, e.g. detection of living beings
• CPC Class Codes: H04B 5/72 for local intradevice communication
• CPC Class Codes: H04B 5/79 for data transfer in combination with power transfer

Abstract

In one aspect, a wireless charger may include a wireless power antenna, a wireless power transmitter coupled to the wireless power antenna and configured to generate a wireless charging field in a charging region, a first communication antenna, a first transceiver coupled to the communication antenna and configured to communicate with the chargeable device via the communication antenna, a first signal strength detector configured to determine a signal strength of a first signal received by the transceiver, and a controller configured to determine whether the chargeable device is within the charging region based at least in part on the signal strength of the first signal.

Claims

1. A wireless charger for transmitting wireless charging power to a chargeable device, the wireless charger comprising:

a wireless power antenna;

a wireless power transmitter coupled to the wireless power antenna and configured to generate a wireless charging field in a charging region;

a first communication antenna;

a first transceiver coupled to the first communication antenna and configured to wirelessly communicate with the chargeable device by receiving at least a first wireless signal from the chargeable device via the first communication antenna, the chargeable device separate from the wireless charger;

a first signal strength detector configured to determine a signal strength of the first wireless signal received by the first transceiver from the chargeable device; and

a controller configured to determine a timing of the first wireless signal and to determine whether to establish a communication channel with the chargeable device based at least in part upon the timing of the first wireless signal and the signal strength of the first wireless signal indicative of the chargeable device being within the charging region.

2. The wireless charger of claim 1, wherein the controller is further configured to enable the wireless power transmitter upon determination that the chargeable device is within the charging region.

3. The wireless charger of claim 1, wherein the controller is further configured to disable the wireless power transmitter upon determination that the chargeable device is outside of the charging region.

4. The wireless charger of claim 3, wherein the controller is further configured to cease any transmissions between the first transceiver and the chargeable device.

5. The wireless charger of claim 1, wherein the controller is further configured transmit a notification to at least one of the chargeable device or another wireless charger via the first communication antenna, the notification including information related to the signal strength of the first wireless signal.

6. The wireless charger of claim 5, wherein the notification further includes information related to whether the chargeable device is within the charging region.

7. The wireless charger of claim 1, further comprising:

a phase detector configured to measure a phase of the first wireless signal received by the transceiver; and

wherein the controller is further configured to determine whether the chargeable device is within the charging region based at least in part on the phase of the first wireless signal.

8. The wireless charger of claim 1, further comprising:

a second communication antenna;

a second transceiver coupled to the communication antenna and configured to communicate with the chargeable device via the communication antenna;

a second signal strength detector configured to determine a signal strength of a second wireless signal received by the second transceiver; and

wherein the controller is further configured to determine whether the chargeable device is within the charging region based at least in part on the signal strength of the second wireless signal.

9. The wireless charger of claim 8, further comprising:

a multiplexor configured to selectively couple the first communication antenna or the second communication antenna to the first transceiver;

wherein the second transceiver is the first transceiver; and

wherein the second signal strength detector is the first signal strength detector.

10. The wireless charger of claim 8, wherein the first wireless signal is the second wireless signal.

11. The wireless charger of claim 8, wherein the first and second communication antennas are directional antennas.

12. The wireless charger of claim 1, further comprising:

a load detector configure to detect a load on a power pulse, wherein the wireless power transmitter is further configured to transmit the power pulse;

wherein the controller is configured to scan, in response to the detected load, for broadcast from the chargeable device;

wherein the transceiver is further configured to receive a broadcast from the chargeable device and transmit a connection request to establish the communication channel with the chargeable device in response to the broadcast.

13. The wireless charger of claim 1, wherein the controller is further configured to detect a modulation of the wireless charging field by the chargeable device and further determine whether to establish the communication channel with the chargeable device based upon the modulation of the wireless charging field.

14. The wireless charger of claim 1, wherein the controller is further configured to maintain a list of one or more chargeable devices, and wherein the determination of whether to establish the communication channel with the chargeable device is further based upon whether the chargeable device is present on the maintained list.

15. The wireless charger of claim 1, wherein the controller is further configured to track an electrical characteristic of the wireless charging field relative to an electrical characteristic of the chargeable device, and determine whether to maintain the communication channel with the chargeable device based upon a relationship between the tracked electrical characteristic of the wireless charging field and the electrical characteristic of the chargeable device.

16. A method for transmitting wireless charging power to a chargeable device via a wireless charger, the method comprising:

receiving, at the wireless charger, a first wireless signal from the chargeable device via a first communication antenna of the wireless charger, the chargeable device being separate from the wireless charger;

determining, at the wireless charger, a first signal strength of the first wireless signal and a second signal strength of the second wireless signal;

determining, at the wireless charger, a timing of the first wireless signal; and

determining, at the wireless charger, whether to establish a communication channel with the chargeable device based at least in part upon the timing of the first wireless signal and the signal strength of the first wireless signal indicative of the chargeable device being within a charging region.

17. The method of claim 16, further comprising enabling a wireless power transmitter upon determination that the chargeable device is within the charging region.

18. The method of claim 16, further comprising disabling a wireless power transmitter upon determination that the chargeable device is outside of the charging region.

19. The method of claim 18, further comprising ceasing any communication transmissions between a transceiver coupled to the first communication antenna and the chargeable device.

20. The method of claim 16, further comprising transmitting a notification to at least one of the chargeable device or another wireless charger via the first communication antenna, the notification including information related to the signal strength of the first wireless signal.

21. The method of claim 20, wherein the notification further includes information related to whether the chargeable device is within the charging region.

22. The method of claim 16, further comprising:

detecting a phase of the first wireless signal; and

wherein the determining whether the chargeable device is within a charging region is further based at least in part on the phase of the first wireless signal.

23. The method of claim 16, further comprising:

receiving a second wireless signal from the chargeable device via a second communication antenna;

determining a signal strength of the second wireless signal; and

wherein the determining whether the chargeable device is within a charging region is further based at least in part on the signal strength of the second wireless signal.

24. The wireless charger of claim 23, wherein the first and second communication antennas are directional antennas.

25. The method according to claim 16 further comprising:

transmitting a power pulse from the wireless charger;

detecting, at the wireless charger, a load on the power pulse;

scanning, in response to the detected load, for a broadcast from the chargeable device;

receiving a broadcast from the chargeable device; and

transmitting a connection request to establish the communication channel with the chargeable device in response to the broadcast.

26. A wireless charger for transmitting wireless charging power to a chargeable device, the wireless charger comprising:

means for transmitting power wirelessly;

means for generating a wireless charging field in a charging region via the means for transmitting power;

first means for transmitting or receiving communication signals;

first means for wirelessly communicating with the chargeable device by receiving a first wireless signal from the chargeable device via the first means for transmitting or receiving communication signals, the chargeable device separate from the wireless charger;

first means for determining a first signal strength of the first wireless signal from the chargeable device received by the first means for communicating;

means for determining a timing of the first wireless signal; and

means for determining whether to establish a communication channel with the chargeable device based at least in part upon the timing of the first wireless signal and the signal strength of the first wireless signal indicative of the chargeable device being within the charging region.

27. The wireless charger of claim 26, further comprising means for enabling the means for transmitting power wirelessly upon determination that the chargeable device is within the charging region.

28. The wireless charger of claim 26, further comprising means for transmitting a notification to at least one of the chargeable device or another wireless charger via the means for transmitting or receiving signals, the notification including information related to the signal strength of the first wireless signal.

29. The wireless charger of claim 26, further comprising:

means for measuring a phase of the first wireless signal received by the means for communicating; and

wherein the determining whether the chargeable device is within the charging region is additionally based at least in part on the phase of the first wireless signal.

30. The wireless charger of claim 26, further comprising:

another means for transmitting or receiving communication signals;

another means for communicating with the chargeable device via the another means for transmitting or receiving communication signals;

means for determining a signal strength of a second signal received by the another means for communicating; and

wherein the determining whether the chargeable device is within the charging region is additionally based at least in part on the signal strength of the second signal.