Method and Apparatus to Provide Platform Power Peak Limiting based on Charge of Power Assist Unit

• US 20200133361A1
• Filed: 10/30/2018
• Published: 04/30/2020
• Est. Priority Date: 10/30/2018
• Status: Active Grant

• Current Assignee: Dell Products LP (Dell Technologies Inc.)
• Original Assignee: Dell Products LP (Dell Technologies Inc.)
• Inventors: Jenne, John E., Muccini, Mark A., Berke, Stuart Allen
• Granted Patent: US 11,144,105 B2
• Time in Patent Office: Days
• CPC Class Codes: G06F 1/263 Arrangements for using multiple switchable power supplies, e.g. battery and AC G06F1/30 takes precedence
• CPC Class Codes: G06F 1/28 Supervision thereof, e.g. detecting power-supply failure by out of limits supervision
• CPC Class Codes: G06F 1/3212 Monitoring battery levels, e.g. power saving mode being initiated when battery voltage goes below a certain level
• CPC Class Codes: G06F 1/3296 by lowering the supply or operating voltage
• CPC Class Codes: H02J 2207/30 Charge provided using DC bus or data bus of a computer
• CPC Class Codes: H02J 7/0048 Detection of remaining charge capacity or state of charge [SOC]
• CPC Class Codes: H02J 7/0068 Battery or charger load switching, e.g. concurrent charging and load supply H02J7/0013 takes precedence

Abstract

An information handling system includes a power assist unit (PAU) and a baseboard management controller (BMC). The PAU is coupled to a power rail and includes a power storage element, a converter coupled to the power storage element and the power rail, and a controller. The controller receives a current level indication indicating a current provided to a load of the information handling system, directs the converter to provide power from the power storage element to the power rail when the current level indication is greater than a threshold level, directs the converter charge the power storage element from the power rail when the current level indication is greater than the threshold level, and provides a charge level indication that indicates an amount of charge on the power storage unit. The BMC receives the charge level indication, and sets a peak power limit for the information handling system based on the charge level indication.

Claims

1. An information handling system, comprising:

a power assist unit coupled to a power rail, the power assist unit including;

a power storage element;

a converter coupled to the power storage element and to the power rail; and

a controller configured to receive a current level indication indicating a current provided to a load of the information handling system, to direct the converter to provide power from the power storage element to the power rail when the current level indication is greater than a threshold level, to direct the converter to charge the power storage element from the power rail when the current level indication is less than the threshold level, and to provide a charge level indication that indicates an amount of charge on the power storage unit; and

a baseboard management controller configured to receive the charge level indication, and to set a peak power limit for the information handling system based on the charge level indication.

2. The information handling system of claim 1, wherein setting the peak power limit is further in response to the charge level indication being below a first threshold.

3. The information handling system of claim 2, wherein the baseboard management controller sets the peak power limit to a maximum value when the charge level indication is above the first threshold.

4. The information handling system of claim 2, wherein in setting the peak power limit, the baseboard management controller is further configured to set a power limit of a processor of the information handling system.

5. The information handling system of claim 4, wherein the information handling system is configured to set the information handling system to a system-wide low power mode when the charge level indication is below a second threshold, the second threshold being lower than the first threshold.

7. The information handling system of claim 1, wherein the power storage element comprises a rechargeable battery.

6. The information handling system of claim, wherein the power storage element comprises a supercapacitor.

8. A method, comprising:

coupling a power storage element of a power assist unit of an information handling system to a converter of the power assist unit;

coupling the converter to a power rail of the information handling system;

receiving, by a controller of the power assist unit, a current level indication indicating a current provided to a load of the information handling system;

directing, by the controller, the converter to provide power from the power storage element to the power rail when the current level indication is greater than a threshold level;

directing, by the controller, the converter to charge the power storage element from the power rail when the current level indication is less than the threshold level;

providing a charge level indication that indicates an amount of charge on the power storage unit;

receiving, by a baseboard management controller of the information handling system, the charge level indication; and

setting a peak power limit for the information handling system based on the charge level indication.

13. The method of claim 8, wherein the power storage element comprises a supercapacitor.

14. The method of claim 8, wherein the power storage element comprises a rechargeable battery.

9. The method of claim 9, wherein setting the peak power limit is further in response to the charge level indication being below a first threshold.

10. The method of claim 9, further comprising:

setting the peak power limit to a maximum value when the charge level indication is above the first threshold.

11. The method of claim 9, wherein in setting the peak power limit, the method further comprises:

setting a power limit of a processor of the information handling system.

12. The method of claim 11, further comprising:

setting, by the information handling system, the information handling system to a system-wide low power mode when the charge level indication is below a second threshold, the second threshold being lower than the first threshold.

15. An information handling system, comprising:

a power supply unit configured to provide a power rail to power a load of the information handling system, and to provide a current level indication indicating a current provided to the load by the power supply unit;

a power assist unit coupled to the power rail, the power assist unit including;

a power storage element;

a converter coupled to the power storage element and to the power rail; and

a controller configured to receive the current level indication, to direct the converter to provide power from the power storage element to the power rail when the current level indication is greater than a threshold level, to direct the converter to charge the power storage element from the power rail when the current level indication is less than the threshold level, and to provide a charge level indication that indicates an amount of charge on the power storage unit; and

a baseboard management controller configured to receive the charge level indication, and to set a peak power limit for the information handling system based on the charge level indication.

16. The information handling system of claim 15, wherein setting the peak power limit is further in response to the charge level indication being below a first threshold.

17. The information handling system of claim 16, wherein the baseboard management controller sets the peak power limit to a maximum value when the charge level indication is above the first threshold.

18. The information handling system of claim 16, wherein in setting the peak power limit, the baseboard management controller is further configured to set a power limit of a processor of the information handling system.

19. The information handling system of claim 18, wherein the information handling system is configured to set the information handling system to a system-wide low power mode when the charge level indication is below a second threshold, the second threshold being lower than the first threshold.

20. The information handling system of claim 15, wherein the power storage element comprises one of a supercapacitor and a battery.