Systems, devices, and methods for providing backup power to a load

• US 8,638,010 B2
• Filed: 02/17/2010
• Issued: 01/28/2014
• Est. Priority Date: 02/17/2010
• Status: Active Grant

• Current Assignee: Integrated Device Technology Incorporated (Renesas Electronics Corporation)
• Original Assignee: Integrated Device Technology Incorporated (Renesas Electronics Corporation)
• Inventors: Ly, Wallace
• Primary Examiner(s): KAPLAN, HAL IRA
• Application Number:
  US12/707,576
• Publication Number:
  US 20110198931A1
• Time in Patent Office: 1,441 Days
• Field of Search: 307/109
• US Class Current: 307/109
• CPC Class Codes: H02J 7/345 using capacitors as storage or buffering devices
• CPC Class Codes: H02M 3/155 using semiconductor devices only

Abstract

Systems, devices, and methods for providing backup power to a load are disclosed. A power converter may comprise a capacitor array comprising a plurality of capacitors and configured to store a charge from an input during a charge mode of operation and provide a charge to an output during a discharge mode of operation. Further, the power converter may comprise a controller configured to selectively couple the capacitor array to the input during a portion of the charge mode of operation and selectively couple the capacitor array to the output during a portion of the discharge mode of operation.

Claims

1. A power converter, comprising:

a capacitor array comprising a plurality of capacitors and configured to store a charge from an input during a charge mode and provide a charge to an output during a discharge mode;

a capacitor operably coupled between the output and a ground voltage; and

a controller configured to selectively couple the capacitor array to the input during a portion of the charge mode and selectively couple the capacitor array to the output during a portion of the discharge mode.

2. The power converter of claim 1, wherein the controller comprises a MOSFET driver.

3. The power converter of claim 1, wherein the capacitor array is configured to provide a charge of at least four volts for at least five milliseconds to the output during the discharge mode.

4. The power converter of claim 1, wherein the capacitor array comprises a capacitance of substantially 800 microfarads.

5. The power converter of claim 1, wherein the controller is configured to transition from the charge mode to the discharge mode upon detection of a loss of power at the input.

6. The power converter of claim 1, wherein the controller is configured to selectively couple the capacitor array to the input during the portion of the charge mode and selectively couple the capacitor array to the output during the portion of the discharge mode using common circuitry.

17. The method of claim 5, wherein charging the capacitor array within the power converter to a second voltage level comprises charging the capacitor array to a voltage substantially near twenty volts.

7. A power converter, comprising:

a capacitor array comprising a plurality of capacitors and configured to store a charge from an input during a charge mode and provide a charge to an output during a discharge mode;

a controller configured to selectively couple the capacitor array to the input during a portion of the charge mode and selectively couple the capacitor array to the output during a portion of the discharge mode; and

an inductor configured to be selectively coupled between the input and the capacitor array during the portion of the charge mode and between the capacitor array and the output during the portion of the discharge mode.

8. The power converter of claim 7, wherein the inductor comprises an inductance of substantially near one microhenry.

9. A power converter, comprising:

a capacitor array comprising a plurality of capacitors and configured to store a charge loom input during a charge mode and provide a charge to an output during a discharge mode; and

a controller configured to selectively couple the capacitor array to the input during a portion of the charge mode and selectively couple the capacitor array to the output during a portion of the discharge mode; and

a plurality of transistors, wherein a gate of each transistor of the plurality of transistors is operably coupled to the controller.

10. A power converter, comprising:

a capacitor array comprising a plurality of capacitors and configured to store a charge from an input during a charge mode and provide a charge to an output during a discharge mode; and

a controller configured to selectively couple the capacitor array to the input during a portion of the charge mode and selectively couple the capacitor array to the output during a portion of the discharge mode;

wherein the charge mode comprises a charging boost mode and the discharge mode comprises a discharging buck mode.

11. A method, comprising:

receiving an input voltage at each of a load and a power converter at a first voltage level;

charging a capacitor array within the power converter to a second voltage level greater than the first voltage level by coupling the input voltage to an inductor during one phase and coupling the inductor to the capacitor array during another phase; and

conveying an output voltage from the power converter to the load at a third voltage level less than the second voltage level upon detection of a loss of power supplied to the load.

12. The method of claim 11, wherein conveying the output voltage from the power converter to the load comprises conveying the output voltage from the power converter to one of a solid-state drive and a mechanical hard drive.

13. The method of claim 11, wherein charging the capacitor array within the power converter to a second voltage level comprises charging the capacitor array to a voltage substantially near twenty volts.

14. The method of claim 11, wherein receiving the input voltage at each of the load and the power converter comprises receiving a voltage substantially near five volts as the input voltage at each of the load and the power converter.

15. A method, comprising:

receiving an input voltage at each of a load and a power converter at a first voltage level;

charging a capacitor array within the power converter to a second voltage level greater than the first voltage level and coupling the input voltage to an inductor during one phase and coupling the inductor to the capacitor array during another phase; and

conveying an output voltage from the power converter to the load at a third voltage level less than the second voltage level upon detection of a loss of power supplied to the load by coupling the capacitor array to an inductor during a phase and coupling the inductor to the load during another phase.

16. The method of claim 15, wherein conveying the output voltage from the power converter to the load comprises conveying the output voltage from the power converter to one of a solid-state drive and a mechanical hard drive.

18. The method of claim 15, wherein receiving the input voltage at each of the load and the power converter comprises receiving a voltage substantially near five volts as the input voltage at each of the load and the power converter.

19. A method, comprising:

storing energy from an input in a capacitor array comprising a plurality of capacitors during a first stage, the storing comprising coupling an inductor between an input voltage and a ground voltage during a first phase of the first stage and coupling the inductor between the input voltage and the capacitor array during a second phase of the first stage; and

outputting the energy stored in the capacitor array to a load during a second stage upon detection of a loss of power at the input.

20. The method of claim 19, wherein storing energy in the capacitor array comprises storing a voltage substantially near twenty volts in the capacitor array.

21. The method of claim 19, wherein outputting the energy stored in the capacitor array comprises outputting the energy stored in the capacitor array to a data storage device.

22. A method, comprising:

storing energy from an input in a capacitor array comprising a plurality of capacitors during a first stage; and

outputting the energy stored in the capacitor array to a load during a second stage upon detection of a loss of power at the input;

wherein outputting comprises coupling an inductor between the capacitor array and an output during a first phase of the second stage and coupling the inductor between a ground voltage and the output during a second phase of the second stage.

23. A system, comprising:

an electronic device;

a data storage device coupled to the electronic device; and

a power converter operably coupled to the data storage device and configured to;

store energy in a capacitor array during a first phase comprising a charging boost mode; and

convey the energy stored in the capacitor array to the data storage device during a second phase comprising a discharging buck mode.

24. The system of claim 23, wherein the data storage device comprises one of a solid-state drive and a mechanical hard drive.

25. The system of claim 23, further comprising a controller coupled to the power converter and configured to sense a loss of power provided to the data storage device.

26. The system of claim 23, wherein the power converter is further configured to convey the energy stored in the capacitor array to the data storage device upon detection of a loss of power provided to the data storage device.

27. The system of claim 23, wherein the power converter is configured to store energy in a capacitor array during a first phase and convey the energy stored in the capacitor array to the data storage device during a second phase using common circuitry.