Techniques for clock synchronization and control in wireless power delivery environments

• US 10,566,845 B2
• Filed: 06/29/2016
• Issued: 02/18/2020
• Est. Priority Date: 06/30/2015
• Status: Active Grant

• Current Assignee: Ossia, Inc.
• Original Assignee: Ossia, Inc.
• Inventors: Zeine, Hatem, Mayes, Dale
• Primary Examiner(s): Barnie, Rexford N
• Assistant Examiner(s): Shiao, David A
• Application Number:
  US15/196,785
• Publication Number:
  US 20170005533A1
• Time in Patent Office: 1,329 Days
• CPC Class Codes: H02J 50/20 using microwaves or radio frequency waves
• CPC Class Codes: H02J 50/23 characterised by the type of transmitting antennas, e.g. directional array antennas or Yagi antennas
• CPC Class Codes: H02J 50/40 using two or more transmitting or receiving devices H02J50/50 takes precedence
• 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 7/00034 Charger exchanging data with an electronic device, i.e. telephone, whose internal battery is under charge
• CPC Class Codes: H04W 4/025 using location based information parameters
• CPC Class Codes: H04W 56/0035 detecting errors in frequency or phase
• CPC Class Codes: H04W 56/0075 based on arrival time vs. expected arrival time

Abstract

Techniques for automated clock synchronization and control are discussed herein. For example, the techniques can include monitoring of transmissions for ‘known’ events and identifying timing or frequencies of such events. Deviations in the timing or frequencies of the events from expected times or frequencies may indicate that wireless power transmission system and receiver clocks are not synchronized. The deviations can be used to synchronize the clock for optimum wireless power transfer. Techniques are also described for enhancing clock control mechanisms to provide additional means for managing the adjustments of the clocks, as well as for enabling wireless power transmission systems to mimic client clock offsets for effective synchronization of events (e.g., beacon signals).

Claims

1. A method of facilitating synchronization between a wireless power receiver client and a wireless power transmission system in a wireless power delivery environment, the method comprising:

monitoring scheduled events related to wireless power transfers in the wireless power delivery environment,

wherein the scheduled events are associated with one or more expected properties;

detecting occurrence of a scheduled event comprising a beacon signal initiated by the wireless power receiver client and received by the wireless power transmission system or a wireless power transmission signal initiated by the wireless power transmission system and received by the wireless power receiver client;

identifying one or more properties of the scheduled event including a time that the scheduled event is received; and

comparing the one or more properties of the scheduled event to expected properties associated with the event including comparing the time that the scheduled event is received to a time that the scheduled event is expected to be received to determine a clock differential between a clock of the wireless power receiver client and a clock of the wireless power transmission system.

2. The method of claim 1, wherein identifying the one or more properties of the scheduled event comprises identifying an incoming frequency of the scheduled event.

3. The method of claim 2, wherein comparing the one or more properties of the scheduled event to the expected properties associated with the event further includes comparing the incoming frequency of the scheduled event to an expected frequency to determine a phase differential.

4. The method of claim 3, wherein the expected frequency of the scheduled event comprises a frequency at which scheduled events are transmitted.

5. The method of claim 1, further comprising:

synchronizing the clock of the wireless power receiver client with the clock of the wireless power transmission system based on the clock differential.

6. The method of claim 5, wherein synchronizing the clock of the wireless power receiver client and the clock of the wireless power transmission system comprises adjusting a pre-scalar in a counter or a fractional part of a phase lock loop (PLL).

7. The method of claim 1, further comprising:

reporting the clock differential to the wireless power receiver client or the wireless power transmission system.

8. The method of claim 7, further comprising:

determining that the clock differential is greater than a threshold; and

responsively reporting the clock differential to the wireless power receiver client or the wireless power transmission system or synchronizing the clock of the wireless power receiver client or the clock of the wireless power transmission system based on the clock differential.

9. A non-transitory computer-readable storage medium having program instructions stored thereon which, when executed by one or more processors, cause the one or more processors to facilitate synchronization between a wireless power receiver client and a wireless power transmission system in a wireless power delivery environment:

monitor scheduled events related to wireless power transfers in the wireless power delivery environment,

wherein the scheduled events are associated with one or more expected properties;

detect occurrence of a scheduled event comprising a beacon signal initiated by the wireless power receiver client and received by the wireless power transmission system or a wireless power transmission signal initiated by the wireless power transmission system and received by the wireless power receiver client;

identify one or more properties of the scheduled event including a time that the scheduled event is received; and

compare the one or more properties of the scheduled event to expected properties associated with the event including comparing the time that the scheduled event is received to a time that the scheduled event is expected to be received to determine a clock differential between a clock of the wireless power receiver client and a clock of the wireless power transmission system.

10. The computer-readable storage medium of claim 9, wherein the program instructions, when executed by one or more processors, cause the one or more processors to:

synchronize the wireless power receiver client and the wireless power transmission system based on the clock differential.

11. The computer-readable storage medium of claim 10, wherein to synchronize the wireless power receiver client and the wireless power transmission system based on the clock differential, the one or more processors adjust one or more of a pre-scalar in a counter or a fractional part of a phase lock loop (PLL).

12. The computer-readable storage medium of claim 9, wherein to identify the one or more properties of the scheduled event, the program instructions, when executed by the one or more processors, cause the one or more processors to identify an incoming frequency of the scheduled event.

13. The computer-readable storage medium of claim 12, wherein to compare the one or more properties of the scheduled event to the expected properties associated with the event, the program instructions, when executed by the one or more processors, cause the one or more processors to compare the incoming frequency of the scheduled event to an expected frequency to determine a phase differential.

14. The computer-readable storage medium of claim 13, wherein the expected frequency of the scheduled event comprises a frequency at which scheduled events are transmitted.

15. The computer-readable storage medium of claim 9, wherein the program instructions, when executed by the one or more processors, further cause the one or more processors to:

report the clock differential to the wireless power receiver client or the wireless power transmission system.

16. The computer-readable storage medium of claim 15, wherein the program instructions, when executed by the one or more processors, further cause the one or more processors to:

determine that the clock differential is greater than a threshold; and

responsively report the clock differential to the wireless power receiver client or the wireless power transmission system or synchronize the clock of the wireless power receiver client or the clock of the wireless power transmission system based on the clock differential.

17. A system for facilitating synchronization between a wireless power receiver client and a wireless power transmission system in a wireless power delivery environment, the system comprising:

control circuitry configured to;

monitor scheduled events related to wireless power transfers in the wireless power delivery environment,

wherein the scheduled events are associated with one or more expected properties;

detect occurrence of a scheduled event comprising a beacon signal initiated by the wireless power receiver client and received by the wireless power transmission system or a wireless power transmission signal initiated by the wireless power transmission system and received by the wireless power receiver client;

identify one or more properties of the scheduled event including a time that the scheduled event is received; and

compare the one or more properties of the scheduled event to expected properties associated with the event including comparing the time that the scheduled event is received to a time that the scheduled event is expected to be received to determine a clock differential between a clock of the wireless power receiver client and a clock of the wireless power transmission system.

18. The system of claim 17, wherein:

to identify the one or more properties of the scheduled event, the control circuitry is configured to identify an incoming frequency of the scheduled event, and

to compare the one or more properties of the scheduled event to the expected properties associated with the event, the control circuitry is further configured to compare the incoming frequency of the scheduled event to an expected frequency to determine a phase differential.

19. The system of claim 17, wherein the control circuitry is further configured to:

synchronize the clock of the wireless power receiver client with the clock of the wireless power transmission system based on the clock differential,

wherein to synchronize the clock of the wireless power receiver client and the clock of the wireless power transmission system, the control circuitry is configured to adjust one or more of a pre-scalar in a counter or a fractional part of a phase lock loop (PLL).

20. The system of claim 17, wherein the control circuitry is further configured to:

determine if the clock differential to the wireless power receiver client or the wireless power transmission system is greater than a threshold; and

when the clock differential is greater than the threshold,

report the clock differential to the wireless power receiver client or the wireless power transmission system, or

synchronize the clock of the wireless power receiver client and the clock of the wireless power transmission system based on the clock differential.