Systems and methods for disabling power management in a computer system

• US 7,366,924 B2
• Filed: 04/25/2005
• Issued: 04/29/2008
• Est. Priority Date: 04/25/2005
• Status: Active Grant

• Current Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Original Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Inventors: Batchelor, Michael D., Hupman, Paul M.
• Primary Examiner(s): SURYAWANSHI, SURESH
• Application Number:
  US11/113,482
• Publication Number:
  US 20060242439A1
• Time in Patent Office: 1,100 Days
• Field of Search: 713/300, 713/340, 320/117, 320/127, 320/162, 700/22
• US Class Current: 713/300
• CPC Class Codes: G06F 1/3203 Power management, i.e. event-based initiation of a power-saving mode
• CPC Class Codes: G06F 1/324 by lowering clock frequency
• CPC Class Codes: G06F 1/3296 by lowering the supply or operating voltage
• CPC Class Codes: Y02D 10/00 Energy efficient computing, e.g. low power processors, power management or thermal management

Abstract

A power adapter comprises a power supply to output power for powering a powered device when the powered device is coupled to the power adapter. The power adapter further comprises a disable throttle indicator that, when the powered device is coupled to the power adapter, indicates to the powered device that the powered device need not reduce an amount of power used by the powered device in order to keep the power adapter within regulation.

Claims

1. A power adapter comprising:

a power supply to output power for powering a powered device when the powered device is coupled to the power adapter; and

a disable throttle indicator to provide an indication to the powered device to disable a power throttle operative within the powered device when the powered device is coupled to the power adapter;

wherein the power throttle operative within the powered device controls an amount of power used by the powered device so that a load current drawn by the powered device remains below an assumed maximum load current for any power adapter coupled to the powered device.

2. The power adapter of claim 1, wherein the disable throttle indicator provides the indication to the powered device to disable the power throttle operative within the powered device by actuating a switch included in the powered device when the power adapter is coupled to the powered device.

3. The power adapter of claim 2, wherein the disable throttle indicator mechanically actuates the switch included in the powered device when the power adapter is coupled to the powered device.

4. The power adapter of claim 2, wherein actuating the switch included in the powered device when the power adapter is coupled to the powered device does at least one of:

closing the switch and opening the switch.

5. The power adapter of claim 1, wherein the disable throttle indicator comprises a terminal on which a disable throttle indicator signal is communicated to the powered device.

6. A power adapter comprising:

a power supply to output power for powering a powered device when the powered device is coupled to the power supply;

wherein, when the powered device is coupled to the power adapter, the power supply communicates, to the powered device, information indicating to the powered device that the powered device should disable a power throttle operative within the powered device;

wherein the power throttle operative within the powered device controls an amount of power used by the powered device so that a load current drawn by the powered device remains below an assumed maximum load current for any power adapter coupled to the powered device.

7. The power adapter of claim 6, further comprising a device interface via which the power is applied to the powered device.

8. The power adapter of claim 7, wherein the information is communicated to the powered device when the powered device is coupled to the power adapter via the device interface.

9. The power adapter of claim 6, wherein the powered device comprises a portable computer.

10. The power adapter of claim 6, wherein the power adapter is coupled to the powered device via an intermediary device.

11. A powered device comprising:

an interface to receive power from a power adapter;

wherein the powered device comprises a power management function that, when performed, controls an amount of power used by the powered device so that a load current drawn by the powered device is below an assumed maximum load current for any power adapter coupled to the powered device;

wherein the powered device further comprises a disable throttle interface to receive an indication from the power adapter that the power management function need not be performed.

12. The powered device of claim 11, wherein, in response to receiving the indication, the powered device does not perform the power management function.

13. The powered device of claim 11, wherein the interface comprises a switch, wherein the indication is received when the switch is actuated.

14. The powered device of claim 13, wherein the indication is received when the switch is mechanically actuated.

15. The powered device of claim 13, wherein the indication is received when at least one of the following occurs:

the switch is closed and the switch is opened.

16. The powered device of claim 11, wherein the interface comprises a terminal on which a disable throttle indicator signal is received.

17. The powered device of claim 11, wherein the power management function comprises at least one of:

reducing the amount of power used to charge a battery and reducing a frequency at which a processing unit is operated.

18. The powered device of claim 11, further comprising a basic input/output system, wherein the basic input/output system is operable to cause the powered device to perform the power management function.

19. A powered device comprising:

means for receiving power from a power adapter;

means for using at least a portion of the received power to power at least one component;

means for throttling the amount of power used by the powered device so that a load current drawn by the powered device remains below an assumed maximum load current for any power adapter coupled to the powered device; and

means for receiving an indication that the powered device should disable the means for throttling the amount of power used by the powered device.

20. The powered device of claim 19, wherein the component comprises a processing unit, wherein the powered device further comprises means for adjusting a frequency at which the processing unit operates in order to control the amount of power used by the processing unit.

21. The powered device of claim 19, wherein the component comprises a battery charger, wherein the powered device further comprises means for adjusting an amount of power used by the battery charger in order to control the amount of power used by the battery charger.

22. A method comprising:

providing power from a power adapter to a powered device; and

indicating to the powered device that the powered device should disable a power throttle operative within the powered device;

wherein the power throttle operative within the powered device controls an amount of power used by the powered device so that a load current drawn by the powered device remains below an assumed maximum load current for any power adapter coupled to the powered device.

23. The method of claim 22, wherein indicating to the powered device that the powered device need not reduce the amount of power used by the powered device in order to keep the power adapter from entering the current limited state comprises at least one of:

directly indicating to the powered device that the powered device should disable a power throttle operative within the powered device; and

indirectly indicating to the powered device that the powered device should disable a power throttle operative within the powered device.