Power discovery and allocation within a power sharing group

• US 8,676,393 B1
• Filed: 03/15/2011
• Issued: 03/18/2014
• Est. Priority Date: 03/15/2011
• Status: Active Grant

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Inventors: Hupton, John R., Tareen, Ali Ahmad, Vavilala, Krishna Kumar, McGaughey, Johnston Reid, Lln, Minli
• Primary Examiner(s): Ali, Mohammad
• Assistant Examiner(s): Booker, Kelvin
• Application Number:
  US13/048,475
• Time in Patent Office: 1,099 Days
• Field of Search: None
• US Class Current: 700/295
• CPC Class Codes: G05F 1/585 providing voltages of opposite polarities
• CPC Class Codes: G06Q 50/06 Energy or water supply
• CPC Class Codes: H02J 2310/60 Limiting power consumption in the network or in one section of the network, e.g. load shedding or peak shaving
• CPC Class Codes: H02J 2310/66 one of the loads acting as master and the other or others acting as slaves
• 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

Disclosed in an example embodiment herein is a technique for performing discovery and power budgeting for a power sharing group comprising a plurality of power supply modules configured for sharing power. Data is collected to determine members of the power sharing group, input power and load power for members of the power sharing group. A power budget is determined for members of the power sharing group and the power budget is distributed to members of the power sharing group. Load shedding inputs are calculated in the event that load power exceeds the capacity of the power sharing group.

Claims

1. An apparatus, comprising:

an interface for communicating with at least one other power supply module;

a controller coupled with the interface;

wherein the controller is operable to determine members of a power sharing group through messages received from the interface;

wherein the controller collects data representative of input power and load power for members of the power sharing group;

wherein the controller determines a power budget for members of the power sharing group based on the data representative of input power and load power for members of the power sharing group;

wherein the controller distributes the power budget to members of the power sharing group via the interface;

wherein the controller determines a remaining capacity if a neighboring power supply module no longer shares power;

wherein the controller determines in accordance with the remaining capacity a first set of loads to immediately shed if the neighboring power supply module no longer shares power;

wherein the controller stores immediate load shedding data in a hardware register, the immediate load shedding data being representative of the first set of loads to immediately shed if the neighboring power supply module no longer shares power; and

,

wherein the controller selectively immediately sheds the first set of loads responsive to the neighboring power supply module no longer sharing power and in accordance with the immediate load shedding data stored in the hardware register.

2. The apparatus set forth in claim 1, wherein the data representative of load comprises a minimum power requirement and a maximum power requirement.

3. The apparatus set forth in claim 1, wherein the controller determines a power budget for a power sharing mode.

4. The apparatus set forth in claim 1, wherein the controller determines a power budget for a redundant mode.

5. The apparatus set forth in claim 1, wherein the controller determines whether there has been a change in one of a group consisting of capacity and load;

wherein the controller calculates a new power supply budget for members of the power sharing group responsive to detecting the change in one of the group consisting of capacity and load; and

wherein the controller distributes the new power supply budget to member of the power sharing group.

6. The apparatus set forth in claim 1, wherein the controller determines a priority level for loads;

and

wherein the controller sorts the loads by priority level to enable graceful power shedding.

7. The apparatus set forth in claim 1, wherein the controller arranges loads in descending order;

wherein the controller determines an amount of power remaining if a power supply module is removed; and

wherein the controller determines which loads should be shed if the power supply is removed from the power sharing group.

8. The apparatus set forth in claim 1, wherein the controller determines the remaining capacity in accordance with a selected threshold relative to a remaining power if a neighboring power supply module no longer shares power.

9. The apparatus set forth in claim 1, wherein the controller performs under voltage load shedding responsive to determining a power supply failure and an invalid power sharing group configuration.

10. The apparatus set forth in claim 9, wherein the controller disables under voltage load shedding responsive to detecting a valid configuration.

11. A method, comprising:

determining members of a power sharing group;

obtaining data representative of input power and load power for members of the power sharing group;

determining, by a controller, a power budget for members of the power sharing group based on the data representative of input power and load power;

distributing the power budget to members of the power sharing group;

determining a remaining capacity if a neighboring power supply module no longer shares power;

determining in accordance with the remaining capacity a first set of loads to immediately shed if the neighboring power supply module no longer shares power;

storing immediate load shedding data in a hardware register, the immediate load shedding data being representative of the first set of loads to immediately shed if the neighboring power supply module no longer shares power; and

,

selectively immediately shedding the first set of loads responsive to the neighboring power supply module no longer sharing power and in accordance with the immediate load shedding data stored in the hardware register.

12. The method set forth in claim 11, further comprising:

determining a load level for loads being powered by members of the power sharing group; and

sorting the loads by priority loading in descending order to enable graceful power shedding.

13. The method set forth in claim 11, further comprising:

sorting loads by power level in descending order;

determining an amount of power remaining if a power supply module is removed; and

,

determining which loads to remove in sorted order if the power supply module is removed.

14. The method set forth in claim 11, further comprising determining a topology;

and,

determining remaining capacity and which loads to shed based topology changes if a neighboring power supply module is no longer sharing power.

15. The method set forth in claim 11, further comprising:

determining a power supply failure;

determining an invalid power sharing group configuration; and

performing under voltage load shedding responsive to determining the power supply failure and the invalid power sharing group configuration.

16. Logic encoded in a non-transitory computer readable storage medium for execution by a processor, and when executed operable to:

determine members of a power sharing group;

obtain data representative of input power and load power for members of the power sharing group;

determine a power budget for members of the power sharing group based on the data representative of input power and load power for members of the power sharing group;

distribute the power budget to members of the power sharing group;

determine a remaining capacity if a neighboring power supply module no longer shares power;

determine in accordance with the remaining capacity a first set of loads to immediately shed if the neighboring power supply module no longer shares power;

store immediate load shedding data in a hardware register, the immediate load shedding data being representative of the first set of loads to immediately shed if the neighboring power supply module no longer shares power; and

,

selectively immediately shed the first set of loads responsive to the neighboring power supply module no longer sharing power and in accordance with the immediate load shedding data stored in the hardware register.

17. The logic set forth in claim 16, wherein the data representative of load power comprises a minimum power requirement and a maximum power requirement.

18. The logic set forth in claim 16, wherein the power budget is for a power sharing mode.

19. The logic set forth in claim 16, wherein the power budget is for a redundant mode.

20. The logic set forth in claim 16, further operable to:

determine whether there has been a change in one of a group consisting of power supply capacity and load;

calculate a new power supply budget for members of the power sharing group responsive to detecting the change in one of the group consisting of power supply capacity and load; and

distribute the new power supply budget to members of the power sharing group.