Backup power system and method

• US 7,962,772 B2
• Filed: 02/07/2008
• Issued: 06/14/2011
• Est. Priority Date: 02/07/2008
• Status: Active Grant

• Current Assignee: Ainet Registry, LLC
• Original Assignee: Ainet Registry, LLC
• Inventors: Jain, Deepak K.
• Primary Examiner(s): Lee; Thomas
• Assistant Examiner(s): Chang; Eric
• Application Number:
  US12/027,682
• Publication Number:
  US 20090204838A1
• Time in Patent Office: 1,223 Days
• Field of Search: 713/300
• US Class Current: 713/300
• CPC Class Codes: H02J 9/062 for AC powered loads
• CPC Class Codes: Y02B 10/70 Hybrid systems, e.g. uninterruptible or back-up power supplies integrating renewable energies

Abstract

Various embodiments of a backup power system and method may include a transfer switch, connections to primary and secondary power sources, a stored energy component, and an interconnected controller with a processor and memory. The transfer switch may provide power to an external load from a selected one of the primary power source, the secondary power source, or the stored energy component. The controller may compare energy stored within the stored energy component against a first threshold relating to a maximum time necessary for the secondary power source to at least reach a predetermined minimum output level, and also to compare the stored energy level to a second threshold greater than the first threshold. The second threshold may be selected to reduce a number of on/off cycles of the secondary power source during periods of intermittent primary power fluctuation that are less severe than a prolonged loss of power.

Claims

1. A backup power system, the system comprising:

a secondary power source;

a stored energy component capable of storing energy therein; and

a controller in data communication with the secondary power source and the stored energy component,

wherein said controller is configured to;

compare a measured energy level of energy stored within the stored energy component against a first threshold relating to a maximum time necessary for the secondary power source to at least reach a predetermined minimum output level, and

compare the stored energy level to a second threshold greater than the first threshold, said second threshold being selected so as to reduce a number of on/off cycles of the secondary power source during periods of intermittent power fluctuation of the primary power source that are less severe than a prolonged full power loss by the primary power source,

said controller being controlled and arranged so as to selectively provide power to an external load from one of a primary power source, the secondary power source, and the stored energy component in response to one or more comparison results.

2. The system of claim 1, further comprising a transfer switch electrically connectable to the primary power source and electrically connected to the secondary power source, wherein an operation of said transfer switch is controlled by the controller so as to provide power to the external load from a selected one of the primary power source, the secondary power source, and the stored energy component.

3. The system of claim 1, wherein said controller is configured to provide power to said external load from the stored energy component during said periods of intermittent power fluctuation.

4. The system of claim 1, wherein said controller is configured to selectively restore the stored energy level in the stored energy component to at least the second threshold in response to a comparison result indicating that the stored energy level is less than the second threshold.

5. The system of claim 4, wherein said stored energy level in the stored energy component is restored by operatively connecting the secondary power source to the stored energy component.

6. The system of claim 4, wherein said stored energy level in the stored energy component is restored, at least in part, by operatively connecting the primary power source to the stored energy component.

7. The system of claim 4, wherein said controller is configured to selectively restore the stored energy level in the stored energy component to a predetermined energy level greater than the second threshold.

8. The system of claim 7, wherein said controller is configured to restore the stored energy level in the stored energy component to the predetermined energy level by using the secondary power source.

9. The system of claim 8, wherein the secondary power source provides power to the external load through a transfer switch.

10. The system of claim 1, wherein, in response to an indication that said stored energy level is not greater than the first threshold, said controller provides one or more signals that energize said secondary power source.

11. The system of claim 1, wherein said controller is configured to provide one or more signals that energize said secondary power source if said primary power source is not available.

12. The system of claim 1, wherein, in response to an indication that said stored energy level is greater than the second threshold, said controller is configured to provide one or more signals that place said secondary power source in a standby mode.

13. The system of claim 1, further comprising a memory operably connected to said controller, said memory being configured to at least store the first and second thresholds.

14. The system of claim 1, further comprising a display and at least one input/output device operably connected to said controller.

15. The system of claim 1, wherein the first threshold is selected so as to ensure that the secondary power source may be brought into service to power the load using less than an amount of power remaining in the stored energy component.

16. A method of making backup power available for a load that receives normal power from a primary power source, the method comprising:

comparing a stored energy level in a stored energy component to a first threshold relating to a maximum time necessary for a secondary power source to at least reach a predetermined minimum output level;

comparing the stored energy level to a second threshold greater than the first threshold, said second threshold being selected so as to reduce a number of on/off cycles of the secondary power source during periods of intermittent power fluctuation of the primary power source that are less severe than a prolonged full power loss by the primary power source; and

in response to one or more comparison results, selectively commanding a transfer of power to the load from one of the primary power source, secondary power source, and the stored energy component.

17. The method of claim 16, further comprising providing a secondary power source.

18. The method of claim 16, further comprising providing a stored energy component.

19. The method of claim 16, further comprising monitoring a stored energy level within the stored energy component.

20. The method of claim 16, further comprising selectively transferring power to said load from the stored energy component during said periods of intermittent power fluctuation.

21. The method of claim 16, further comprising selectively restoring the stored energy level in the stored energy component to at least the second threshold in response to a comparison result indicating that the stored energy level is less than the second threshold.

22. The method of claim 21, wherein said selectively restoring the stored energy level in the stored energy component comprises transferring power from the secondary power source to the stored energy component.

23. The method of claim 21, wherein said selectively restoring the stored energy level in the stored energy component comprises transferring power from the primary power source to the stored energy component.

24. The method of claim 21, wherein said selectively restoring the stored energy level in the stored energy component comprises restoring the stored energy level to a predetermined energy level greater than the second threshold.

25. The method of claim 21, wherein power is selectively transferred to the load from the secondary power source.

26. The method of claim 16, further comprising energizing said secondary power source in response to an indication that said stored energy level is not greater than the first threshold.

27. The method of claim 16, further comprising energizing said secondary power source if said normal power from said primary power source is not available.

28. The method of claim 16, further comprising placing said secondary power source in a standby mode in response to an indication that said stored energy level is greater than the second threshold.

29. The method of claim 16, further comprising storing at least store the first and second thresholds in a memory operably connected to a processor.

30. The method of claim 16, further comprising displaying a system status.

31. The method of claim 30, wherein said displaying a system status comprises displaying at least an operational status of the secondary power source and the stored energy component.

32. The method of claim 16, further comprising selecting the first threshold so as to ensure that the secondary power source may be brought into service to power the load using less than said stored energy level in the stored energy component.

33. An article of manufacture, comprising:

a computer-readable medium having computer readable program code embodied therein for causing a computer to control power transfer to a load from one or more sources of power, wherein, upon execution by the computer, the computer-readable program code in said article of manufacture causes the computer to;

compare a stored energy level in a stored energy element to a first threshold relating to a maximum time necessary for a secondary power source to at least reach a predetermined minimum output level;

compare the stored energy level to a second threshold greater than the first threshold, said second threshold being selected so as to reduce a number of on/off cycles of the secondary power source during periods of intermittent power fluctuation of a primary power source that are less severe than a prolonged full power loss by the primary power source; and

in response to one or more comparison results, generate one or more signals useful in commanding a selective transfer of power to a load from one of the primary power source, the secondary power source, and the stored energy component.

34. The article of manufacture of claim 33, further comprising computer-readable program code which, when executed by the computer, causes the computer to monitor a stored energy level within the stored energy component.

35. A controller useful in selecting a source of power provided to a load, the controller comprising:

a processor arranged to receive one or more parameters relating to a primary power source, a secondary power source, and a stored energy component; and

a memory operatively connected to the processor;

wherein said processor is configured to;

compare a measured energy level representing energy stored within the stored energy component against a first threshold stored in said memory, said first threshold relating to a maximum time necessary for the secondary power source to at least reach a predetermined minimum output level; and

compare the measured energy level to a second threshold stored in said memory, said second threshold being greater than the first threshold and selected so as to reduce a number of on/off cycles of the secondary power source during periods of intermittent power fluctuation of the primary power source that are less severe than a prolonged full power loss by the primary power source,

wherein, in response to one or more comparison results, said processor selectively provides one or more signals that command power to be provided to the load from one of a primary power source, the secondary power source, and the stored energy component.

36. The controller of claim 35, wherein, via said one or more signals, said processor selectively commands power to be provided to the stored energy component if the measured energy level is less than the second threshold.

37. The controller of claim 35, wherein said first and second thresholds may be changed in said memory through a user interface.