System and method for providing dynamic charge current based on maximum card power

• US 9,377,835 B2
• Filed: 06/19/2013
• Issued: 06/28/2016
• Est. Priority Date: 06/17/2013
• Status: Active Grant

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: Avago Technologies General IP PTE Limited (Broadcom, Inc.)
• Inventors: Wade, Rex C., McCollum, Justin R.
• Primary Examiner(s): Lee, Thomas
• Assistant Examiner(s): Derose, Volvick
• Application Number:
  US13/921,319
• Publication Number:
  US 20140372783A1
• Time in Patent Office: 1,105 Days
• Field of Search: 713/340
• US Class Current: 1/1
• CPC Class Codes: G06F 1/3203 Power management, i.e. event-based initiation of a power-saving mode
• CPC Class Codes: G06F 1/3206 Monitoring of events, devices or parameters that trigger a change in power modality

Abstract

Aspects of the disclosure pertain to a system and method for providing dynamic charge current based on maximum expansion card power. Dynamic monitoring of overall power usage by an expansion card is performed. Based on the dynamic monitoring, power consumption of a charging circuit of the card is dynamically adjusted for maintaining the overall power consumption of the expansion card at or below a pre-determined power limit (e.g., at or below an expansion slot power limit). Further, based on the dynamic monitoring, an amount of charging current provided by a current limiting device of the charging circuit to an energy storage device of the charging circuit is dynamically adjusted.

Claims

1. A method of operating an expansion card, comprising:

monitoring, via a monitoring circuit of the expansion card, input power consumed by components of the expansion card receiving power from power rails that each provide power to the expansion card at a different level of voltage, wherein the input power includes power consumed by the components from each of the power rails;

when monitoring determines that the input power is below a threshold, establishing a power limit for a charging circuit of the expansion card at a value equal to the difference between the threshold and the input power;

when monitoring determines that the input power is equal to or greater than the threshold, establishing the power limit at a value equal to zero; and

establishing a current limit for the charging circuit based upon the power limit.

2. The method as claimed in claim 1, further comprising:

providing an amount of charging current from a current limiting device of the charging circuit to an energy storage device of the charging circuit based upon the current limit.

3. The method as claimed in claim 1, further comprising:

monitoring the input power in real-time.

4. The method as claimed in claim 1, further comprising:

increasing the current limit if the input power reduces over time.

5. The method as claimed in claim 1, further comprising:

decreasing the current limit if the input power increases over time.

6. The method as claimed in claim 1, wherein:

the power rails are coupled with an expansion slot that the expansion card is inserted into.

7. The method as claimed in claim 1, wherein:

one of the power rails provides power at 12 volts, and another of the power rails provides power at 3.3 volts.

8. A non-transitory computer-readable medium having computer-executable instructions for performing a method of operating an expansion card, the method comprising:

monitoring, via a monitoring circuit of the expansion card, input power consumed by components of the expansion card receiving power from power rails that each provide power to the expansion card at a different level of voltage, wherein the input power includes power consumed by the components from each of the power rails;

when monitoring determines that the input power is below a threshold, establishing a power limit for a charging circuit of the expansion card at a value equal to the difference between the threshold and the input power;

when monitoring determines that the input power is equal to or greater than the threshold, establishing the power limit at a value equal to zero;

establishing a current limit for the charging circuit based upon the power limit; and

providing an amount of charging current from a current limiting device of the charging circuit to an energy storage device of the charging circuit based upon the current limit.

9. The non-transitory computer-readable medium as claimed in claim 8, the method further comprising:

monitoring the input power in real-time.

10. The non-transitory computer-readable medium as claimed in claim 8, the method further comprising:

increasing the current limit if the input power reduces over time.

11. The non-transitory computer-readable medium as claimed in claim 8, the method further comprising:

decreasing the current limit if the input power increases over time.

12. The non-transitory computer-readable medium as claimed in claim 8, wherein

the power rails are coupled with an expansion slot that the expansion card is inserted into.

13. The non-transitory computer-readable medium as claimed in claim 8, wherein:

one of the power rails provides power at 12 volts, and another of the power rails provides power at 3.3 volts.

14. An expansion card, comprising:

a monitoring system configured for monitoring input power consumed by components of the expansion card from power rails that each provide power to the expansion card at a different level of voltage, wherein the input power includes power consumed by the components from each of the power rails; and

a charging circuit connected to the monitoring system,

the charging circuit including a current limiting device and also including an energy storage device that is connected to the current limiting device, wherein the current limiting device is configured for providing electrical current to charge the energy storage device,

wherein when the monitoring system determines that the input power is below a threshold, it establishes a power limit for the charging circuit at a value equal to the difference between the threshold and the input power,

wherein when the monitoring system determines that the input power is equal to or greater than the threshold, it establishes the power limit at a value equal to zero, and

wherein the current limiting device establishes a current limit for the charging circuit based upon the power limit.

15. The expansion card as claimed in claim 14, further comprising:

a second monitoring system configured for dynamically monitoring input power provided to the expansion card.

16. The expansion card as claimed in claim 15, further comprising:

a processor, the processor being connected to the monitoring systems and the charging circuit.

17. The expansion card as claimed in claim 16, wherein the monitoring systems are configured for providing outputs to the processor based upon the input power.

18. The expansion card as claimed in claim 17, wherein the processor, based upon the monitoring system outputs, provides an output to the charging circuit.

19. The expansion card as claimed in claim 18, wherein the current limiting device dynamically adjusts an amount of electrical current the current limiting device provides to the energy storage device based on the processor output.

20. The expansion card as claimed in claim 16, wherein the processor is a microcontroller.