Power supply for an electrical load

• US 6,847,192 B2
• Filed: 05/15/2001
• Issued: 01/25/2005
• Est. Priority Date: 05/15/2000
• Status: Expired due to Term

• Current Assignee: Cap-Xx Ltd.
• Original Assignee: Energy Storage Systems, Inc. (ESS Tech, Inc.)
• Inventors: Keshishian, Sarkis, Paul, George Lange, Turner, Geoffrey Alan
• Primary Examiner(s): Tso, Edward H.
• Application Number:
  US10/276,407
• Publication Number:
  US 20030169022A1
• Time in Patent Office: 1,351 Days
• Field of Search: 320/103, 320/107, 320/117, 320/138, 320/166, 307/64, 307/65, 307/66
• US Class Current: 320/166
• CPC Class Codes: G06F 1/30 Means for acting in the event of power-supply failure or interruption, e.g. power-supply fluctuations for resetting only G06F1/24
• CPC Class Codes: H02J 7/0013 acting upon several batteries simultaneously or sequentially H02J7/1423 takes precedence
• CPC Class Codes: H02J 7/0025 Sequential battery discharge in systems with a plurality of batteries
• CPC Class Codes: H02J 7/345 using capacitors as storage or buffering devices

Abstract

A power supply (1) is for an electrical load in the form of a Notebook computer (2). Power supply (1) includes first terminals (3, 4) which extend from computer (2) for releasably electrically connecting with a first energy storage device in the form of battery (5) during a first interval. A second energy storage device, in the form a second battery (not shown), releaseably electrically connects with terminals (3, 4) during a second interval spaced apart from the first interval. This allows power to be supplied to the load during those intervals. A capacitive energy storage device, designated generally by reference numeral (6), supplies power to the load during a third interval that spans the spacing between the first and the second intervals.

Claims

1. A power supply for an electrical load, the power supply including:

first terminals extending from the load for releaseably electrically connecting with a first energy storage device during a first interval and a second energy storage device during a second interval spaced apart from the first interval for allowing power to be supplied to the load during those intervals; and

a capacitive energy storage device for supplying power to the load during a third interval that spans the spacing between the first and the second intervals.

2. A power supply according to claim 1 wherein the third interval overlaps with one or both of the first and second intervals.

3. A power supply according to claim 1 wherein the first and the second energy storage devices are first and second batteries.

4. A power supply according to claim 1 wherein the first and the second energy storage devices are fuel cells.

5. A power supply according to claim 1 wherein the load is a portable computer and the batteries are rechargeable and are the primary source of power for the computer.

6. A power supply according to claim 5 wherein the computer includes a run mode which has a first average power consumption and a standby or sleep mode which has a second average power consumption, where the first average is greater than the second average and the computer is placed in standby mode during the third interval.

7. A power supply according to claim 6 wherein the computer is responsive to the attempted removal of the battery currently being used to progress into the standby mode.

8. A power supply according to claim 6 wherein the computer mechanically obstructs removal of the battery currently being used until the computer is in standby mode.

9. A power supply according to claim 1 wherein the capacitive energy storage device includes at least one supercapacitor.

10. A power supply according to claim 9 wherein the supercapacitor is a carbon double layer superapacitor.

11. A power supply according to claim 10 including a switching device for allowing the supercapacitor to discharge through the terminals during the third interval.

12. A power supply according to claim 11 wherein the switching device allows the supercapacitor to partially or fully recharge, as required, during the first or second intervals.

13. A method for providing power supply to an electrical load, the method including the steps of:

releaseably electrically connecting first terminals extending from the load with a first energy storage device during a first interval and a second energy storage device during a second interval spaced apart from the first interval for allowing power to be supplied to the load during those intervals; and

supplying power to the load during a third interval that spans the spacing between the first and the second intervals with a capacitive energy storage device.

14. A portable electrical device including:

a housing for an electrical load;

a supply rail disposed within the housing for allowing power to be supplied to the load;

a port in the housing for removeably receiving at least a portion of a battery having two battery terminals, wherein the battery terminals electrically connect with the supply rail such that the battery provides power to the load; and

a capacitive energy storage device located within the housing for providing power to the load when the supply terminals are electrically disconnected from the supply rail.

15. A device according to claim 14 wherein the battery and the capacitive device are connected in parallel.

16. A device according to claim 14 wherein the battery is moveable between a nested configuration within the housing where the battery terminals are electrically connected with the supply rail and a remote configuration where the battery terminals are electrically disconnected with the supply rail.

17. A device according to claim 16 wherein the capacitive device includes a supercapacitor in series with a switch circuit, the circuit being responsive to the electrical disconnection of the battery terminals and the supply rail for allowing the supercapacitor to provide power to the load.

18. A device according to claim 17 wherein the circuit is also responsive to the electrical connection of the battery terminals and the supply rail for preventing the capacitor from providing power to the load.

19. A method of producing a portable electrical device including:

providing a housing for an electrical load;

disposing a supply rail within the housing for allowing power to be supplied to the load;

removably receiving within a port in the housing at least a portion of a battery having two battery terminals, wherein the battery terminals electrically connect with the supply rail such that the battery provides power to the load; and

locating a capacitive energy storage device within the housing for providing power to the load when the supply terminals are electrically disconnected from the supply rail.

20. A power supply for an electrical load having a housing, the power supply including:

first terminals extending from the load for releaseably electrically connecting with a first energy storage device during a first interval and a second energy storage device during a second interval spaced apart from the first interval for allowing power to be supplied to the load during those intervals; and

a substantially planar energy storage device located within the housing for supplying power to the load during a third interval that spans the spacing between the first and the second intervals.

21. A power supply according to claim 20 wherein the energy storage device is a supercapacitor.

22. A power supply according to claim 21 wherein the supercapacitor is flexible.

23. A power supply according to claim 21 wherein the load is a portable computer and the housing has two hingedly connected sections and the supercapacitor is mounted in one of the sections.