Backup power stage associated with a dual input power supply and method of operating the same

• US 6,297,972 B1
• Filed: 05/10/2000
• Issued: 10/02/2001
• Est. Priority Date: 05/10/2000
• Status: Expired due to Fees

• Current Assignee: Lucent Technologies, Inc. (Nokia Corporation)
• Original Assignee: Lucent Technologies, Inc. (Nokia Corporation)
• Inventors: Chen, Qing
• Primary Examiner(s): BERHANE, ADOLF D
• Application Number:
  US09/567,881
• Time in Patent Office: 510 Days
• Field of Search: 363/14, 363/34, 363/35, 363/37, 363/40, 363/44, 363/142, 363/24, 307/64, 307/65, 307/66
• US Class Current: 363/37
• CPC Class Codes: H02J 9/062 for AC powered loads
• CPC Class Codes: H02M 5/225 comprising two stages of AC-AC conversion, e.g. having a high frequency intermediate link

Abstract

A dual input power supply, a method of operating the power supply and a telecommunications power plant incorporating the power supply or the method. In one embodiment, the power supply includes: (1) a single stage power converter, coupled to an input of the power supply, configured to receive primary power subject to interruption and provide therefrom DC power to a DC bus; (2) an output power stage, coupled to the DC bus, configured to condition the DC power for delivery to an output of the power supply; and (3) a backup power stage, couplable to a backup power source and having an output coupled to the DC bus, configured to provide backup power during the interruption, the single stage power converter configured to restrict a reverse flow of the backup power therethrough during the interruption.

Claims

1. A dual input power supply, comprising:

a single stage power converter, coupled to an input of said power supply, configured to receive primary power subject to interruption and provide therefrom DC power to a DC bus;

an output power stage, coupled to said DC bus, configured to condition said DC power for delivery to an output of said power supply; and

a backup power stage comprising a bi-directional DC-DC converter couplable to a backup power source and having an output coupled to said DC bus, configured to provide backup power during said interruption, said single stage power converter configured to restrict a reverse flow of said backup power therethrough during said interruption.

2. The power supply as recited in claim 1 wherein said primary power is AC power, said power supply further comprising:

an input filter, coupled to said input of said power supply, configured to filter said AC power; and

a rectifier, coupled to said input filter, configured to provide rectified power to said single stage power converter.

3. The power supply as recited in claim 1 wherein said primary power is AC power, said single stage power converter configured to provide power factor correction, isolation and voltage regulation of said primary power.

4. The power supply as recited in claim 1 wherein said output power stage comprises a DC-AC converter.

5. The power supply as recited in claim 1 wherein said output power stage comprises a DC-DC converter.

6. The power supply as recited in claim 5 wherein said output power stage further comprises an output filter coupled to said output of said power supply.

7. A method of operating a dual input power supply to provide primary and backup power, comprising:

receiving primary power subject to interruption in a single stage power converter and providing therefrom DC power to a DC bus;

conditioning said DC power in an output power stage coupled to said DC bus to develop output power for delivery to an output of said power supply;

providing backup power during said interruption with a backup power stage comprising a bi-directional DC-DC converter couplable to a backup power source and having an output coupled to said DC bus; and

restricting a reverse flow of said backup power through said single stage power converter during said interruption.

8. The method as recited in claim 7 wherein said primary power is AC power, said method further comprising:

filtering said AC power to develop filtered AC power; and

rectifying said filtered AC power for delivery to said single stage power converter.

9. The method as recited in claim 7 wherein said primary power is AC power, said single stage power converter configured to provide power factor correction, isolation and voltage regulation of said primary power.

10. The method as recited in claim 7, wherein said conditioning is performed by a DC-AC converter.

11. The method as recited in claim 7 wherein said conditioning is performed by a DC-DC converter.

12. The method as recited in claim 7 wherein said conditioning comprises filtering said output power with an output filter.

13. A telecommunications power plant, comprising:

a backup power source;

a dual input power supply having an input and an output, including;

a single stage power converter, coupled to said input that receives primary power subject to interruption and provides therefrom DC power to a DC bus,

an output power stage, coupled to said DC bus, that conditions said DC power for delivery to said output of said power supply, and

a backup power stage comprising a bi-directional DC-DC converter, coupled to said backup power source and having an output coupled to said DC bus, that provides backup power during said interruption, said single stage power converter restricting a reverse flow of said backup power therethrough during said interruption; and

telecommunications equipment coupled to said output of said power supply.

14. The power plant as recited in claim 13 wherein said primary power is AC power, said power supply further comprising:

an input filter, coupled to said input, that filters said AC power; and

a rectifier, coupled to said input filter, that provided rectified power to said single stage power converter.

15. The power plant as recited in claim 13 wherein said primary power is AC power, said single stage power converter providing power factor correction, isolation and voltage regulation of said primary power.

16. The power plant as recited in claim 13 wherein said output power stage comprises a DC-AC converter.

17. The power plant as recited in claim 13 wherein said output power stage comprises a DC-DC converter.

18. The power plant as recited in claim 17 wherein said output power stage further comprises a n output filter coupled to said output of said power supply.