System and Method for Providing Dynamic Power Management

• US 20110184579A1
• Filed: 12/14/2010
• Published: 07/28/2011
• 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
• Granted Patent: US 8,504,217 B2
• Time in Patent Office: Days
• 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 multi-phase power source for providing input current to a plurality of power outlets and a plurality of other loads, comprising:

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

repeating said measuring the input current if the measured input current is less than a first set current value;

entering a first power limiting mode if the measured input current is greater than the first set current value and less than a second set current value, the second set current value being greater than the first set current value;

in the first power limiting mode,

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;

entering a second power limiting mode if the first resultant input current is greater than the second set current value;

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; and

repeating said measuring the first resultant input current and said 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 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,

entering the second power limiting mode if the measured input current is greater than the second set current value,

in the second power limiting mode,

disabling each of the power outlets;

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

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; and

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.

2. The method of claim 1, wherein the second release current value is less than the first release current value.

3. 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.

4. The method of claim 1, further comprising converting the input power into at least one output power suitable for the loads, wherein the output power comprises multiple forms of power, including single-phase alternating current power and/or direct current power, at a plurality of different voltage and/or current levels.

5. The method of claim 1, further comprising entering the third power limiting mode if the measured input current is greater than a third set current value, the third set current value being greater than the second set current value,

in the third power limiting mode,

disabling at least one of the other loads;

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

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

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

6. The method of claim 1, further comprising:

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

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

establishing the second release power value as being equal to the second set power 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 power value, the first release power value, the first release timer value, the second set power value, the second release power value, and the second release timer value dynamically changes over time in response to changing system load conditions.

7. The method of claim 6,

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

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

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

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

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

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

8. A power management system, comprising:

a multi-phase power source;

a power distribution system for distributing multi-phase input power provided by said multi-phase power source as output power to a plurality of loads and to a plurality of power outlets; and

a power control system for managing the distribution of the output power among the loads and the power outlets via the power distribution system in accordance with the method of claim 1.

9. The power management system of claim 8, wherein said multi-phase power source includes a plurality of power source subsystems, each of said power source subsystems for receiving a selected phase of main power and for providing a selected phase of the input power.

10. The power management system of claim 9, wherein said multi-phase power source includes a multiple of three power source subsystems such that said multi-phase power source provides three-phase input power.

11. The power management system of claim 9, wherein said power control system measures the input power at said power source subsystems.

12. The power management system of claim 8, wherein said power distribution system includes at least one power conversion system for receiving the multi-phase input power from said multi-phase power source and for converting each phase of the multi-phase input power into suitable output power for a respective load group, each of the load groups including at least one load and at least one power outlet.

13. The power management system of claim 12, wherein said power conversion system receives the multi-phase input power from said multi-phase power source via at least one of an intermediate power junction system and an intermediate power conversion system.

14. The power management system of claim 12, wherein said power control system measures the input power at said power conversion system.

15. A vehicle information system suitable for installation aboard a passenger vehicle, comprising:

a first area distribution box for communicating with a headend system; and

a plurality of first seat electronics boxes coupled with said first area distribution box, each of said first seat electronics boxes and a plurality of first power outlets being associated with a respective first passenger seat group,

wherein the headend system manages distribution of multi-phase input power provided by a multi-phase power source as first output power to said first seat electronics boxes and said first power outlets as characterized by claim 8.

16. The vehicle information system of claim 15, further comprising:

a second area distribution box for communicating with the headend system; and

a plurality of second seat electronics boxes coupled with said second area distribution box, each of said second seat electronics boxes and a plurality of second power outlets being associated with a respective second passenger seat group,

wherein the headend system manages distribution of the multi-phase input power provided by the multi-phase power source as second output power to said second seat electronics boxes and said second power outlets.

17. The vehicle information system of claim 16, wherein the multi-phase power source comprises a first multi-phase power source for receiving first multi-phase main power from a first power main and for providing the first output power to said first seat electronics boxes and said power outlets and a second multi-phase power source for receiving second main power from a second power main and for providing the second output power to said second seat electronics boxes and said second power outlets, and wherein the headend system supports load sharing between the first power main and the second power main.

18. The vehicle information system of claim 16, wherein at least one of said first seat electronics boxes are coupled with said area distribution box in a star network arrangement and said second seat electronics boxes are coupled with said second area distribution box in a star network arrangement.

19. The vehicle information system of claim 16, wherein two or more of said first seat electronics boxes and two or more of said second seat electronics boxes are disposed in a daisy-chain configuration.

20. The vehicle information system of claim 16, wherein said first seat electronics box and said first power outlets of each respective first passenger seat group and said second seat electronics box and said second power outlets of each respective second passenger seat group each receive the input power from a respective power source subsystem of the power source.

21. The vehicle information system of claim 16,

wherein the headend system establishes a first set power value, a first release power value, and a first release timer value for each power source subsystem that provides the multi-phase input power to said first seat electronics boxes and said first power outlets of the first passenger seat groups and establishes a second set power value, a second release power value, and a second release timer value for each power source subsystem that provides the multi-phase input power to said second seat electronics boxes and said second power outlets of the second passenger seat groups,

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

22. The vehicle information system of claim 21, wherein at least one of the first set power value, the first release power value, and the first release timer value for the passenger seat groups is different from at least one of the second set power value, the second release power value, and the second release timer value for the second passenger seat groups.

23. The vehicle information system of claim 22, wherein the first passenger seat groups and the second passenger seat groups are associated with different passenger classes.

24. An aircraft, comprising:

a fuselage;

a plurality of passenger seats being disposed within said fuselage and being coupled with a seat electronics box associated with a selected passenger seat group, each of said passenger seats including a power outlet; and

a vehicle information system being coupled with said fuselage and managing distribution of multi-phase input power provided by a multi-phase power source as output power to said seat electronics box and said power outlets as characterized by claim 16.

25. A computer program product for providing power management to a multi-phase 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 more or more machine-readable storage media and comprising:

instruction for measuring 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 if the measured input current is less than a first set current value;

instruction for entering a first power limiting mode if the measured input current is greater than the first set current value and less than a second set current value, the second set current value being greater than the first set current value;

in the first power limiting mode,

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;

instruction for entering a second power limiting mode if the first resultant input current is greater than the second set current value;

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; and

instruction for repeating said measuring the first resultant input current and said 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 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,

instruction for entering the second power limiting mode if the measured input current is greater than the second set current value,

in the second power limiting mode,

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;

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; and

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 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.