Systems and methods for using a predetermined number of communication channels of a wireless power transmitter to communicate with different wireless power receivers

• US 10,148,097 B1
• Filed: 12/29/2014
• Issued: 12/04/2018
• Est. Priority Date: 11/08/2013
• Status: Active Grant

• Current Assignee: Energous Corporation
• Original Assignee: Energous Corporation
• Inventors: Leabman, Michael A., Brewer, Gregory Scott
• Primary Examiner(s): Cole, Brandon S
• Application Number:
  US14/584,484
• Time in Patent Office: 1,436 Days
• Field of Search: 307104, 320107-115
• CPC Class Codes: H02J 50/00 Circuit arrangements or systems for wireless supply or distribution of electric power
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/20 using microwaves or radio frequency waves
• CPC Class Codes: H02J 50/402 the two or more transmitting or the two or more receiving devices being integrated in the same unit, e.g. power mats with several coils or antennas with several sub-antennas
• 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: H04B 5/79 for data transfer in combination with power transfer

Abstract

An example method disclosed herein includes: detecting, by a wireless communication component supporting a predetermined number of communication channels, receivers within a communication range of a transmitter. The method also includes: in accordance with a determination that a number of receivers is less than or equal to the predetermined number, dedicating communication channels to each respective receiver. Each dedicated communication channel is used to send information identifying a location of the respective receiver to the transmitter. The method further includes: detecting, by the wireless communication component, an additional receiver within the communication range; and in response to the detecting, determining that an updated number of receivers is greater than the predetermined number. In accordance with the determining that the updated number is greater than the predetermined number, ceasing to dedicate a first channel to a first receiver and sharing the first channel with the first receiver and the additional receiver.

Claims

1. A method for wireless power transmission by a wireless power transmitter, comprising:

at the wireless power transmitter that includes a plurality of antennas and a wireless communication component that supports a predetermined number of communication channels;

detecting, by the wireless communication component, a plurality of wireless power receivers within a communication range of the wireless power transmitter;

in accordance with a determination that a number of wireless power receivers in the plurality of wireless power receivers is less than or equal to the predetermined number of communication channels, dedicating communication channels to each respective wireless power receiver of the plurality of wireless power receivers, wherein each dedicated communication channel is used by a respective one of the plurality of wireless power receivers to send information used to identify a location of the respective wireless power receiver to the wireless power transmitter;

detecting, by the wireless communication component, an additional wireless power receiver within the communication range of the wireless power transmitter; and

in response to the detecting, determining that an updated number of wireless power receivers is greater than the predetermined number of communication channels, wherein the updated number of wireless power receivers comprises the additional wireless power receiver and the plurality of wireless receivers; and

in accordance with the determining that the updated number of wireless power receivers is greater than the predetermined number of communication channels, ceasing to dedicate a first communication channel to a first wireless power receiver of the plurality of wireless power receivers and sharing the first communication channel with the first wireless power receiver and the additional wireless power receiver;

receiving, via the wireless communication component and using the shared first communication channel, information used to identify a first location of the first wireless power receiver and information used to identify a second location of the additional wireless power receiver; and

transmitting, via the plurality of antennas of the wireless power transmitter;

first radio frequency (RF) power waves to the first location of the first wireless power receiver, and

second RF power waves to the second location of the additional wireless power receiver.

2. The method of claim 1, wherein the predetermined number of communication channels is four or fewer.

3. The method of claim 1, wherein receiving the information used to identify the first location of the first wireless power receiver and the information used to identify a second location of the additional wireless power receiver includes:

receiving the information used to identify the first location during a first time interval in which the first wireless power receiver uses the shared first communication channel to send the information used to identify the first location to the wireless communication component of the wireless power transmitter, and

receiving the information used to identify the second location during a second time interval, distinct from the first time interval, in which the additional wireless power receiver uses the shared first communication channel to send the information used to identify the second location to the wireless communication component of the wireless power transmitter.

4. The method of claim 3, wherein the first and second time intervals each last for a predetermined amount of time.

5. The method of claim 4, wherein the predetermined amount of time is 1 second or less.

6. The method of claim 3, wherein the first and second time intervals are determined by a controller of the wireless power transmitter using time division multiplexing.

7. The method of claim 6, wherein (i) the determination that a number of wireless power receivers in the plurality of wireless power receivers is less than or equal to the predetermined number of communication channels and (ii) the determining that the updated number of wireless power receivers is greater than the predetermined number of communication channels are both performed by the controller of the wireless power transmitter.

8. The method of claim 1, further comprising:

receiving, via the wireless communication component and using the first shared communication channel, first power status data from the first wireless power receiver and second power status data from the additional wireless power receiver,

wherein;

transmission of the first RF power waves is based on the first power status date, and

transmission of the second RF power waves is based on the second power status data.

9. The method of claim 1, wherein:

the first RF power waves are transmitted by a first set of antennas of the plurality of antennas of the wireless power transmitter,

the second RF power waves are transmitted by a second set of antennas of the plurality of antennas of the wireless power transmitter, and

the first and second sets of antennas are distinct.

10. The method of claim 9, wherein the first and second RF power waves are transmitted in a substantially simultaneous fashion by the first and second sets of antennas, respectively.

11. The method of claim 9, wherein:

the first RF power waves are transmitted by the first set of antennas at a first point in time, and

the second RF power waves are transmitted by the second set of antennas at a second point in time that is after the first point in time.

12. The method of claim 9, wherein:

the first set of antennas is assigned to transmit RF power waves to the first wireless power receiver, and

the second set of antennas is assigned to transmit RF power waves to the additional wireless power receiver.

13. The method of claim 12, wherein:

the first set of antennas is assigned to the first wireless power receiver based on the first location, and

the second set of antennas is assigned to the second wireless power receiver based on the second location.

14. The method of claim 1, wherein the wireless communication component communicates using a wireless communication protocol selected from a group consisting of a Bluetooth protocol, a Wi-Fi protocol, a near-field communication (NFC) protocol, a radio-frequency identification protocol (RFID), and a Zigbee protocol.

15. The method of claim 1, wherein the communication range of the wireless power transmitter corresponds to a predetermined wireless connectivity range of the wireless communication component.

16. The method of claim 15, wherein the communication range of the wireless power transmitter is distinct from a wireless-power-transmission range of the plurality of antennas of the wireless power transmitter.

17. The method of claim 1, wherein:

the first RF power waves constructively interfere at the first location of the first wireless power receiver, and

the second RF power waves constructively interfere at the second location of the additional wireless power receiver.

18. A non-transitory computer-readable storage medium storing one or more programs for execution by one or more processors, the one or more programs comprising instructions for:

detecting, by the wireless communication component, a plurality of wireless power receivers within a communication range of the wireless power transmitter;

in accordance with a determination that a number of wireless power receivers in the plurality of wireless power receivers is less than or equal to the predetermined number of communication channels, dedicating communication channels to each respective wireless power receiver of the plurality of wireless power receivers, wherein each dedicated communication channel is used by a respective one of the plurality of wireless power receivers to send information used to identify a location of the respective wireless power receiver to the wireless power transmitter;

detecting, by the wireless communication component, an additional wireless power receiver within the communication range of the wireless power transmitter; and

in response to the detecting, determining that an updated number of wireless power receivers is greater than the predetermined number of communication channels, wherein the updated number of wireless power receivers comprises the additional wireless power receiver and the plurality of wireless receivers; and

in accordance with the determining that the updated number of wireless power receivers is greater than the predetermined number of communication channels, ceasing to dedicate a first communication channel to a first wireless power receiver of the plurality of wireless power receivers and sharing the first communication channel with the first wireless power receiver and the additional wireless power receiver;

receiving, via the wireless communication component and using the shared first communication channel, information used to identify a first location of the first wireless power receiver and information used to identify a second location of the additional wireless power receiver; and

transmitting, via the plurality of antennas of the wireless power transmitter;

first radio frequency (RF) power waves to the first location of the first wireless power receiver, and

second RF power waves to the second location of the additional wireless power receiver.

19. A wireless power transmitter, comprising:

a plurality of antennas and a wireless communication component that supports a predetermined number of communication channels configured for;

detecting, by the wireless communication component, a plurality of wireless power receivers within a communication range of the wireless power transmitter;

in accordance with a determination that a number of wireless power receivers in the plurality of wireless power receivers is less than or equal to the predetermined number of communication channels, dedicating communication channels to each respective wireless power receiver of the plurality of wireless power receivers, wherein each dedicated communication channel is used by a respective one of the plurality of wireless power receivers to send information used to identify a location of the respective wireless power receiver to the wireless power transmitter;

detecting, by the wireless communication component, an additional wireless power receiver within the communication range of the wireless power transmitter; and

in response to the detecting, determining that an updated number of wireless power receivers is greater than the predetermined number of communication channels, wherein the updated number of wireless power receivers comprises the additional wireless power receiver and the plurality of wireless receivers; and

in accordance with the determining that the updated number of wireless power receivers is greater than the predetermined number of communication channels, ceasing to dedicate a first communication channel to a first wireless power receiver of the plurality of wireless power receivers and sharing the first communication channel with the first wireless power receiver and the additional wireless power receiver;

receiving, via the wireless communication component and using the shared first communication channel, information used to identify a first location of the first wireless power receiver and information used to identify a second location of the additional wireless power receiver; and

transmitting, via the plurality of antennas of the wireless power transmitter;

first radio frequency (RF) power waves to the first location of the first wireless power receiver, and

second RF power waves to the second location of the additional wireless power receiver.