Anytime beaconing in a wireless power transmission system
Systems and methods are described for operating a wireless power transmission system. The wireless power transmission system receives an encoded beacon signal delivered from and initiated by a wireless power receiver client configured to receive wireless power from the wireless power transmission system. The wireless power transmission system also delivers wireless power to the wireless power receiver client and simultaneously detects for additional encoded beacon signals delivered from and initiated by additional wireless power receiver clients.
1. A method of operating a full-duplex wireless power transmission system including an antenna array having at least: a first antenna coupled to a first switch, and a second antenna coupled to a second switch, the method comprising:
receiving, by the first antenna enabled by the first switch, and while the second antenna is disabled by the second switch, a first encoded beacon signal delivered from, and initiated by, a first wireless power receiver client; and
responsive to receiving the first encoded beacon signal,
delivering, via the second antenna enabled by the second switch, wireless power to the first wireless power receiver client; and
detecting, by the first antenna enabled by the first switch, and while also delivering the wireless power to the first wireless power receiver client via the second antenna, a second encoded beacon signal delivered from, and initiated by, a second wireless power receiver client different from the first wireless power receiver client.
2. The method of claim 1 , wherein the first encoded beacon signal indicates a low power level of the first wireless power receiver client.
3. The method of claim 1 , wherein the first encoded beacon signal indicates movement of the first wireless power receiver client into a receiving range of the wireless power transmission system.
4. The method of claim 1 , further comprising:
processing the first encoded beacon signal received from the first wireless power receiver client to identify client-specific information associated with the first wireless power receiver client; and
generating a transmission configuration for the first wireless power receiver client based on the client-specific information.
5. The method of claim 4 , wherein processing the first encoded beacon signal received from the first wireless power receiver client to identify the client-specific information associated with the first wireless power receiver client comprises determining a phase at which the first encoded beacon is received from the first wireless power receiver to identify the client-specific information associated with the first wireless power receiver client based on a stored phase corresponding to the phase at which the first encoded beacon signal is received.
6. The method of claim 4 , wherein the first antenna is a first plurality of antennas, wherein the second antenna is a second plurality of antennas, wherein generating the transmission configuration for the first wireless power receiver client based on the client-specific information comprises:
at an antenna of the first plurality of antennas,
determining a complex conjugate of the received first encoded beacon signal; and
calculating a power transmission phase-shift based on the complex conjugate, and
wherein delivering the wireless power to the first wireless power receiver client using the transmission configuration includes directing an antenna of the second plurality of antennas to deliver wireless power to the first wireless power receiver client using the corresponding power transmission phase-shifts.
7. The method of claim 1 , wherein the wireless power is delivered to the first wireless power receiver client via a first frequency channel while the second encoded beacon signal is also received from the second wireless power receiver client via a second frequency channel.
8. The method of claim 1 , wherein the full-duplex wireless power transmission system is configured to communicate with half-duplex wireless power receiver clients.
9. The method of claim 7 , wherein the first and second frequency channels include multiple phases to facilitate full-duplex in receiving encoded beacon signals and transmitting wireless power.
10. A full-duplex wireless power transmission system comprising:
an antenna array including at least:
a first antenna coupled to a first switch configured to alternately enable and disable the first antenna; and
a second antenna coupled to a second switch configured to alternately enable and disable the second antenna; and
control circuitry operatively coupled with the antenna array, the control circuitry configured to:
responsive to receiving, by the first antenna enabled by the first switch, and while the second antenna is disabled by the second switch, a first encoded beacon signal delivered from, and initiated by, a first wireless power receiver client, direct the second antenna enabled by the second switch to deliver wireless power to the first wireless power receiver client; and
detect, by the first antenna enabled by the first switch, and while the wireless power is also being delivered to the first wireless power receiver client via the second antenna, a second encoded beacon signal delivered from, and initiated by, a second wireless power receiver client different from the first wireless power receiver client.
11. The wireless power transmission system of claim 10 , wherein the first encoded beacon signal indicates a low power level of the first wireless power receiver client.
12. The wireless power transmission system of claim 10 , wherein the first encoded beacon signal indicates a movement of the first wireless power receiver client into a receiving range of the wireless power transmission system.
13. The wireless power transmission system of claim 10 , wherein the control circuitry is further configured to:
process the first encoded beacon received from the first wireless power receiver client to identify client-specific information associated with the first wireless power receiver client; and
generate a transmission configuration for the first wireless power receiver client based on the client-specific information.
14. The wireless power transmission system of claim 13 , wherein to process the first encoded beacon received from the first wireless power receiver client to identify the client-specific information associated with the first wireless power receiver client, the control circuitry is configured to determine a phase at which the first encoded beacon is received from the first wireless power receiver to identify the client-specific information associated with the first wireless power receiver client based on a stored phase corresponding to the phase at which the first encoded beacon is received.
15. The wireless power transmission system of claim 13 , wherein the first antenna is a first plurality of antennas, wherein the second antenna is a second plurality of antennas, wherein to generate the transmission configuration for the first wireless power receiver client based on the client-specific information, the control circuitry is configured to:
at an antenna of the first plurality of antennas,
determine a complex conjugate of the received first encoded beacon signal; and
calculate a power transmission phase-shift based on the complex conjugate, and
wherein to direct the second plurality of antennas to deliver the wireless power to the first wireless power receiver client using the transmission configuration, the control circuitry is further configured to direct an antenna of the second plurality of antennas to deliver wireless power to the first wireless power receiver client using the calculated power transmission phase-shifts.
16. The wireless power transmission system of claim 10 , wherein the wireless power is delivered to the first wireless power receiver client via a first frequency channel while the second encoded beacon signal is also received from the additional second wireless power receiver client via a second frequency channel.
17. The wireless power transmission system of claim 10 , wherein the full-duplex wireless power transmission system is configured to communicate with half-duplex wireless power receiver clients.
18. The wireless power transmission system of claim 16 , wherein the first and second frequency channels include multiple phases to facilitate full-duplex in receiving encoded beacon signals and transmitting wireless power.
19. One or more non-transitory computer-readable storage media having stored thereon program instructions which, when executed by a processor of a full-duplex wireless power transmission system including an antenna array having at least: a first antenna coupled to a first switch, and a second antenna coupled to a second switch, cause the system to:
responsive to receiving, by the first antenna enabled by the first switch, and while the second antenna is disabled by the second switch, a first encoded beacon signal delivered from, and initiated by, a first wireless power receiver client, direct the second antenna enabled by the second switch to deliver wireless power to the first wireless power receiver client; and
detect, by the first antenna enabled by the first switch, and while the wireless power is also being delivered to the first wireless power receiver client via the second antenna, a second encoded beacon signal delivered from, and initiated by, a second wireless power receiver client different from the first wireless power receiver client.
20. The one or more non-transitory computer-readable storage media of claim 19 , wherein the wireless power is delivered to the first wireless power receiver client via a first frequency channel while the second encoded beacon signal is also received from the second wireless power receiver client via a second frequency channel.
21. The one or more non-transitory computer-readable storage media of claim 20 , wherein the first and second frequency channels include multiple phases to facilitate full-duplex in receiving encoded beacon signals and transmitting wireless power.