Power management control system and method

• US 8,228,038 B2
• Filed: 12/23/2009
• Issued: 07/24/2012
• Est. Priority Date: 12/23/2009
• Status: Expired due to Fees

• Current Assignee: Intel Corporation
• Original Assignee: Intel Corporation
• Inventors: Alappat, Kuriappan P., Nguyen, Don J., Mullen, Kevin R.
• Primary Examiner(s): DIAO, M BAYE
• Application Number:
  US12/646,139
• Publication Number:
  US 20110148383A1
• Time in Patent Office: 944 Days
• Field of Search: 320/135
• US Class Current: 320/135
• CPC Class Codes: G06F 1/3203 Power management, i.e. event-based initiation of a power-saving mode
• CPC Class Codes: H02J 1/14 Balancing the load in a network
• CPC Class Codes: H02J 7/0063 with circuits adapted for supplying loads from the battery
• CPC Class Codes: H02J 7/00714 in response to battery charging or discharging current
• CPC Class Codes: H04W 52/0261 managing power supply demand, e.g. depending on battery level
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A power management system includes a sensor to detect current output from a battery, a first comparator to compare the battery current to a first reference value, and a burst controller to perform a first power control operation based on said comparison. The power control operation reduces power consumed by the battery in order to cause the battery current to fall below the first reference value. This may be accomplished by reducing or shutting down power to one or more functions or features of a host system that includes or is coupled to receive power from the battery. The host system may include or correspond to a mobile phone and/or any of a number of other electronic devices.

Claims

1. A power management system, comprising:

a timer;

a sensor to detect current output from a battery; and

a first comparator to compare the battery current to a first reference value; and

a controller to perform a first power control operation based on said comparison, wherein the first power control operation is to reduce power consumed by the battery in order to cause the battery current to fall below the first reference value, and wherein the first power control operation is to be performed when the battery current equals or exceeds the first reference value for a first predetermined period of time counted by the timer.

2. The system of claim 1, wherein the first power control operation is to shut down or to reduce power to one or more functions of a host system to which the battery supplies power, when the battery current equals or exceeds the first reference value for the first predetermined period of time.

3. The system of claim 2, wherein the controller is to perform a second power control operation when the battery current equals or exceeds the second reference value for a second predetermined period of time counted by the timer, wherein the second power control operation is different from the first power control operation.

4. The system of claim 3, wherein the second power control operation is to at least temporarily shut down power to the host system.

5. The system of claim 4, further comprising:

a second comparator to compare the battery current to a second reference value which is greater than the first reference value.

6. The system of claim 5, wherein the first reference value is a predetermined level below a maximum current capability of the host system and the second reference value corresponds to a predetermined maximum allowable current to the host system, which is lower than the maximum current capability of the host system.

7. The system of claim 2, wherein the host system includes a mobile phone.

8. The system of claim 7, wherein the first power control operation is to shut down power to a camera flash circuit of the mobile phone.

9. The system of claim 7, wherein the first power control operation is to reduce volume of an audio circuit of the mobile phone.

10. The system of claim 7, wherein the first power control operation is to reduce or is to shut down power to a vibration circuit of the mobile phone.

11. The system of claim 2, further comprising:

a check circuit to determine whether a rise in battery current is caused by a hysteresis or other temporary effect, the controller to prevent the first power control operation from being performed if the battery current rise is determined by the check circuit to be caused by hysteresis or said other temporary effect.

12. The system of claim 11, wherein the check circuit is coupled between the first comparator and the controller.

13. The system of claim 2, wherein information corresponding to the first reference value and the first predetermined period of time are to be stored in programmable registers included in or coupled to the host system.

14. A power management method, comprising:

detecting current output from a battery;

comparing the battery current to a first reference value; and

performing a first power control operation based on said comparison,

wherein said performing includes measuring a time the battery current equals or exceeds the first reference value, wherein the first power control operation is performed when the current equals or exceeds the first reference value for a first predetermined period of time, and wherein the power control operation reduces power consumed by the battery in order to cause the battery current to fall below the first reference value.

15. The method of claim 14, wherein the first power control operation shuts down or reduces power to one or more functions of a host system to which the battery supplies power, when the battery current equals or exceeds the first reference value for the first predetermined period of time.

16. The method of claim 15, wherein the burst controller is to perform a second power control operation when the battery current equals or exceeds the second reference value for a second predetermined period of time, wherein the second power control operation is different from the first power control operation.

17. The method of claim 16, wherein the second power control operation at least temporarily shuts down power to the host system.

18. The method of claim 15, wherein the host system includes a mobile phone.

19. The method of claim 18, wherein the first power control operation shuts down power to a camera flash circuit of the mobile phone.

20. The method of claim 18, wherein the first power control operation reduces volume of an audio circuit of the mobile phone.

21. The method of claim 18, wherein the first power control operation reduces or shuts down power to a vibration circuit of the mobile phone.

22. A portable electronic device, comprising:

a battery; and

a power control system including;

(a) a sensor to detect current output from a battery;

(b) a first comparator to compare the battery current to a first reference value; and

(c) a controller to perform a first power control operation based on said comparison, wherein the power control operation reduces power consumed by the battery in order to cause the battery current to fall below the first reference value, and wherein the first power control operation is to be performed when the battery current equals or exceeds the first reference value for a first predetermined period of time counted by a timer.

23. The device of claim 22, wherein the device corresponds to or includes a mobile phone.

24. A power management system, comprising:

a sensor to detect current output from a battery;

a comparator to compare the battery current to a reference value; and

a controller to perform a power control operation based on said comparison,

wherein the power control operation is to reduce power consumed by the battery in order to cause the battery current to fall below the reference value, wherein the power control operation is to selectively reduce power to a first circuit or function to be powered by the battery and simultaneously to maintain power to a second circuit or function to be powered by the battery.

25. The system of claim 24, wherein the power control operation is to selectively reduce power to the first circuit or function to a non-zero level.

26. The system of claim 24, wherein the power control operation is to selectively shut off power to the first circuit or function.

27. The system of claim 24, wherein the first circuit or function is to perform within a first range before the power is to be selectively reduced and is to perform within a second range after the power is to be selected reduced, and at least one value in the second range is lower than all values in the first range.

28. The system of claim 24, further comprising:

a timer;

wherein the power control operation is to be performed when the battery current equals or exceeds the reference value for a first predetermined period of time counted by the timer.

29. A portable electronic device, comprising:

a battery; and

a power control system including;

(a) a sensor to detect current output from a battery;

(b) a comparator to compare the battery current to a reference value; and

(c) a controller to perform a power control operation based on said comparison, wherein the power control operation is to reduce power consumed by the battery in order to cause the battery current to fall below the reference value, wherein the power control operation is to selectively reduce power to a first circuit or function to be powered by the battery and simultaneously to maintain power to a second circuit or function to be powered by the battery.

30. The device of claim 29, wherein the power control operation is to selectively reduce power to the first circuit or function to a non-zero level.

31. The device of claim 29, wherein the power control operation is to selectively shut off power to the first circuit or function.

32. The device of claim 29, wherein the first circuit or function is to perform within a first range before the power is to be selectively reduced and is to perform within a second range after the power is to be selected reduced, and at least one value in the second range is lower than all values in the first range.

33. The device of claim 32, wherein at least one of the first circuit or function or the second circuit or function is to correspond to a camera flash, an audio output level, or a vibration rate.

34. The device of claim 33, wherein the first and second ranges are to include different values of vibration rate, audio output level, or camera flash brightness for said at least one of the first circuit or function or the second circuit or function.