System and method for providing dynamic power management

• US 8,897,924 B2
• Filed: 07/15/2013
• Issued: 11/25/2014
• Est. Priority Date: 12/14/2009
• Status: Active Grant

• Current Assignee: Panasonic Avionics Corporation (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Avionics Corporation (Panasonic Holdings Corporation)
• Inventors: Nilsen, Wayne T., Burrows, Grant Edward
• Primary Examiner(s): SHECHTMAN, SEAN P
• Application Number:
  US13/941,808
• Publication Number:
  US 20130305071A1
• Time in Patent Office: 498 Days
• Field of Search: None
• US Class Current: 700/295
• CPC Class Codes: G06F 1/324 by lowering clock frequency
• CPC Class Codes: H02J 2310/40 The network being an on-board power network, i.e. within a vehicle
• CPC Class Codes: H02J 2310/44 for aircrafts
• CPC Class Codes: H02J 3/14 by switching loads on to, or off from, network, e.g. progressively balanced loading
• CPC Class Codes: Y02B 70/3225 Demand response systems, e.g. load shedding, peak shaving
• CPC Class Codes: Y04S 20/222 Demand response systems, e.g. load shedding, peak shaving

Abstract

A power management system suitable for dynamically allocating power provided by a selected power source among one or more associated loads and methods for manufacturing and using same. In a normal operation mode, the power source provides power to one or more enabled loads. The selection of loads that are enabled, and therefore the provided power, can dynamically vary over time. If an undesired power condition arises, a power limiting mode is entered, wherein at least one of the enabled loads is disabled. The resultant power provided by the power source to the remaining enabled loads is measured, and the power limit mode is maintained until the undesired power condition is resolved. As needed, further corrective action, such as disabling additional enabled loads, can be applied to resolve the undesired power condition. The power management system thereby can comprise a hierarchical system for dynamically resolving undesired power conditions.

Claims

1. A method for providing power management to a power source for providing input current to a plurality of power outlets and a plurality of other loads, comprising:

measuring, in an unrestricted power mode, an input current provided by the power source to the loads and the power outlets across each power phase of the power source;

determining whether the measured input current is less than a first set current value;

repeating said measuring the input current, in the unrestricted power mode, in response to said determining;

deciding whether the measured input current is greater than the first set current value and less than a second set current value that is greater than the first set current value;

entering a first power limiting mode in response to said deciding, the first power limiting mode including;

disabling each unused power outlet;

measuring a first resultant input current provided to the loads and the remaining power outlets across each power phase of the power source; and

enabling each of the disabled power outlets and exiting the first power limiting mode if the first resultant input current remains less than a first release current value during a first time interval that is greater than a first release timer value, the first release current value being less than the first set current value.

2. The method of claim 1, wherein said first power limiting mode further includes:

repeating said measuring the first resultant input current if the first resultant input current becomes greater than the first release current value during the first time interval; and

enabling each of the disabled power outlets and exiting the first power limiting mode if the first resultant input current remains less than the first release current value during a subsequent first time interval that is greater than the first release timer value.

3. The method of claim 1, further comprising entering a second power limiting mode if the first resultant input current is greater than the second set current value.

4. The method of claim 3, wherein said second power limiting mode includes:

disabling each of the power outlets;

measuring a second resultant input current provided to the loads across each power phase of the power source; and

enabling the disabled power outlets and exiting the second power limiting mode if the second resultant input current remains less than a second release current value during a second time interval that is greater than a second release timer value, the second release current value being less than the second set current value.

5. The method of claim 4, wherein said second power limiting mode further includes:

repeating said measuring the second resultant input current if the second resultant input current is greater than the second release current value during the second time interval; and

enabling the disabled power outlets and exiting the second power limiting mode if the second resultant input current remains less than the second release current value during a subsequent second time interval that is greater than a second release timer value.

6. The method of claim 3, wherein said repeating said measuring the first resultant input current includes entering the second power limiting mode if the first resultant input current becomes greater than the first release current value during the first time interval.

7. The method of claim 1, wherein said measuring an input current provided by the power source comprises measuring an input current provided by a multi-phase power source.

8. The method of claim 4, wherein the second release current value is less than the first release current value.

9. The method of claim 1, wherein at least one load and at least one power outlet is associated with each power phase of the power source, and wherein each of the loads and each of the power outlets receive output power that is associated with a selected phase of the input power, the output power received by each of the power outlets comprising single-phase output power.

10. The method of claim 1, further comprising converting the input power into multiple forms of output power selected from a group consisting of single-phase alternating current power and direct current power having selected voltage and current levels.

11. The method of claim 5, further comprising at least one of:

establishing the first set current value as being equal to a first predetermined percentage of a maximum baseline current limit of the power source;

establishing the first release current value as being equal to the first set current value less a first predetermined current offset;

establishing the first release timer value as being a first predetermined number of seconds;

establishing the second set current value as being equal to a second predetermined percentage of the maximum baseline current limit of the power source;

establishing the second release current value as being equal to the second set current value less a second predetermined current offset; and

establishing the second release timer value as being a second predetermined number of seconds,

wherein at least one of the first set current value, the first release current value, the first release timer value, the second set current value, the second release current value, and the second release timer value dynamically changes over time in response to changing system load conditions.

12. The method of claim 11, wherein at least one of:

said establishing the first set current value comprises establishing the first set current value as being between eighty percent and eighty-five percent of the maximum baseline current limit of the power source,

said establishing the first release current value comprises establishing the first release current value as being equal to the first set current value less five amperes,

said establishing the first release timer value comprises establishing the first release timer value as being equal to ten seconds,

said establishing the second set current value comprises establishing the second set current value as being equal to ninety percent of the maximum baseline current limit of the power source,

said establishing the second release current value comprises establishing the second release current value as being equal to the second set current value less ten amperes, and

said establishing the second release timer value comprises establishing the second release timer value as being equal to sixty seconds.

13. A computer program product for providing power management to a power source for providing input current to a plurality of power outlets and a plurality of other loads, the computer program product being encoded on one or more non-transitory computer-readable media and comprising:

instruction for measuring, in an unrestricted power mode, an input current provided by the power source to the loads and the power outlets across each power phase of the power source;

instruction for repeating said measuring the input current, in the unrestricted power mode, in response to a determination that a measured input current is less than a first set current value;

instruction for entering a first power limiting mode in response to a determination that a measured input current is greater than the first set current value and less than a second set current value that is greater than the first set current value, including;

instruction for disabling each unused power outlet;

instruction for measuring a first resultant input current provided to the loads and the remaining power outlets across each power phase of the power source; and

instruction for enabling each of the disabled power outlets and exiting the first power limiting mode if the first resultant input current remains less than a first release current value during a first time interval that is greater than a first release timer value, the first release current value being less than the first set current value.

14. The computer program product of claim 13, wherein said instruction for entering the first power limiting mode further includes:

instruction for repeating said measuring the first resultant input current if the first resultant input current becomes greater than the first release current value during the first time interval; and

instruction for enabling each of the disabled power outlets and exiting the first power limiting mode if the first resultant input current remains less than the first release current value during a subsequent first time interval that is greater than the first release timer value.

15. The computer program product of claim 13, further comprising instruction for entering a second power limiting mode if the first resultant input current is greater than the second set current value.

16. The computer program product of claim 15, wherein said instruction for entering the second power limiting mode includes:

instruction for disabling each of the power outlets;

instruction for measuring a second resultant input current provided to the loads across each power phase of the power source; and

instruction for enabling the disabled power outlets and exiting the second power limiting mode if the second resultant input current remains less than a second release current value during a second time interval that is greater than a second release timer value, the second release current value being less than the second set current value.

17. The computer program product of claim 16, wherein said instruction for entering the second power limiting mode further includes:

instruction for repeating said measuring the second resultant input current if the second resultant input current is greater than the second release current value during the second time interval; and

instruction for enabling the disabled power outlets and exiting the second power limiting mode if the second resultant input current remains less than the second release current value during a subsequent second time interval that is greater than a second release timer value.

18. The computer program product of claim 15, wherein said instruction for repeating said measuring the first resultant input current includes instruction for entering the second power limiting mode if the first resultant input current becomes greater than the first release current value during the first time interval.

19. The computer program product of claim 13, wherein said instruction for measuring an input current provided by the power source comprises instruction for measuring an input current provided by a multi-phase power source.

20. The computer program product of claim 16, wherein the second release current value is less than the first release current value.

21. The computer program product of claim 13, wherein at least one load and at least one power outlet is associated with each power phase of the power source, and wherein each of the loads and each of the power outlets receive output power that is associated with a selected phase of the input power, the output power received by each of the power outlets comprising single-phase output power.

22. The computer program product of claim 13, further comprising instruction for convening the input power into multiple forms of output power selected from a group consisting of single-phase alternating current power and direct current power having selected voltage and current levels.

23. The computer program product of claim 17, further comprising at least one of:

instruction for establishing the first set current value as being equal to a first predetermined percentage of a maximum baseline current limit of the power source;

instruction for establishing the first release current value as being equal to the first set current value less a first predetermined current offset;

instruction for establishing the first release timer value as being a first predetermined number of seconds;

instruction for establishing the second current value as being equal to a second predetermined percentage of the maximum baseline current limit of the power source;

instruction for establishing the second release current value as being equal to the second set current value less a second predetermined current offset; and

instruction for establishing the second release timer value as being a second predetermined number of seconds,

wherein at least one of the first set current value, the first release current value, the first release timer value, the second set current value, the second release current value, and the second release timer value dynamically changes over time in response to changing system load conditions.

24. The computer program product of claim 23, wherein at least one of:

instruction for said establishing the first set current value comprises establishing the first set current value as being between eighty percent and eighty-five percent of the maximum baseline current limit of the power source,

instruction for said establishing the first release current value comprises establishing the first release current value as being equal to the first set current value less five amperes,

instruction for said establishing the first release timer value comprises establishing the first release timer value as being equal to ten seconds,

instruction for said establishing the second set current value comprises establishing the second set current value as being equal to ninety percent of the maximum baseline current limit of the power source,

instruction for said establishing the second release current value comprises establishing the second release current value as being equal to the second set current value less ten amperes, and

instruction for said establishing the second release timer value comprises establishing the second release timer value as being equal to sixty seconds.

25. A method for providing power management to a power source for providing input current to a plurality of power outlets and a plurality of other loads, comprising:

measuring, in an unrestricted power mode, an input current provided by the power source to the loads and the power outlets;

determining that the measured input current is less than a first set current value;

repeating said measuring the input current, in the unrestricted power mode, in response to the determining that the measured input current is less than the first set current value;

deciding that the measured input current is greater than the first set current value and less than a second set current value;

entering a first power limiting mode in response to the deciding that the measured input current is greater than the first set current value and less than the second set current value, the first power limiting mode including;

disabling each unused power outlet;

measuring a first resultant input current provided to the loads and the remaining power outlets; and

enabling each of the disabled power outlets and exiting the first power limiting mode if the first resultant input current remains less than a first release current value during a first time interval that is greater than a first release timer value, the first release current value being less than the first set current value.