Modular power supply having an input and output module and method of operation thereof

• US 6,002,596 A
• Filed: 10/09/1998
• Issued: 12/14/1999
• Est. Priority Date: 10/09/1998
• Status: Expired due to Fees

• Current Assignee: Lucent Technologies, Inc. (Nokia Corporation)
• Original Assignee: Lucent Technologies, Inc. (Nokia Corporation)
• Inventors: Wadlington, James C., Mayer, Raymond G.
• Primary Examiner(s): Wong, Peter S.
• Assistant Examiner(s): Patel, Rajnikant B.
• Application Number:
  US09/169,647
• Time in Patent Office: 431 Days
• Field of Search: 363/21, 363/97, 363/40, 363/41, 363/132, 363/71, 307/66, 307/48
• US Class Current: 363/21.04
• CPC Class Codes: H02M 1/40 Means for preventing magnetic saturation
• CPC Class Codes: H02M 3/28 using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
• CPC Class Codes: H02M 3/335 using semiconductor devices only

Abstract

A modular power supply and a method of operating the same to accept either AC or DC input power. In one embodiment, the modular power supply includes an input module that accepts input power and employs at least one main power switch and a step-up transformer to provide intermediate power at an enhanced voltage at an output thereof. The modular power supply also includes a power transfer conductor coupled to the output. The modular power supply further includes an output module, having an input coupled to the conductor, that accepts the intermediate power and employs a step-down transformer and an output rectifier to provide DC output power at a voltage that is less than the enhanced voltage. The modular power supply still further includes a diode, coupled to the input and output modules, that prevents the step-up and step-down transformers from saturating.

Claims

1. A modular power supply, comprising:

an input module that accepts input power and employs a main power switch and a step-up transformer to provide intermediate power at an enhanced voltage at an output thereof;

a power transfer conductor coupled to said output;

an output module, having an input coupled to said conductor, that accepts said intermediate power and employs a step-down transformer and an output rectifier to provide DC output power at a voltage that is less than said enhanced voltage, and

a diode, coupled to said input and output modules, that prevents said step-up and step-down transformers from saturating.

2. The modular power supply as recited in claim 1 wherein said input power is AC input power, said input module further employing an electromagnetic interference filter, a power factor correction circuit and a main power switch controller to provide said intermediate power.

3. The modular power supply as recited in claim 1 wherein said input power is DC input power, said input module further employing an electromagnetic interference filter and a main power switch controller to provide said intermediate power.

4. The modular power supply as recited in claim 1 wherein said step-down transformer further serves as an isolation transformer for said output module.

5. The modular power supply as recited in claim 1 wherein said output module further employs an output filter to provide said DC output power.

6. The modular power supply as recited in claim 1 wherein said step-up transformer has a turns ratio substantially equaling a reciprocal turns ratio of said step-down transformer.

7. The modular power supply as recited in claim 1 wherein said main power switch is a field-effect transistor (FET).

8. The modular power supply as recited in claim 1 wherein said input module further comprises an input filter capacitor.

9. The modular power supply as recited in claim 1 wherein said input module further comprises an input rectifier.

10. The modular power supply as recited in claim 1 wherein said output rectifier comprises at least one rectifier diode.

11. A method of producing DC output power, comprising:

employing a main power switch and a step-up transformer of an input module to convert input power into intermediate power at an enhanced voltage at an output thereof;

transferring said intermediate power from said input module with a power transfer conductor coupled to said output and having a diode in electrical communication therewith;

employing a step-down transformer and an output rectifier of an output module to convert said intermediate power into DC output power at a voltage that is less than said enhanced voltage; and

preventing said step-up and step-down transformers for saturating with said diode.

12. The method as recited in claim 11 wherein said input power is AC input power and said input module further comprises an electromagnetic interference filter, a power factor correction circuit and a main power switch controller.

13. The method as recited in claim 11 wherein said input power is DC input power and said input module further comprises an electromagnetic interference filter and a main power switch controller.

14. The method as recited in claim 11 wherein said step-down transformer further serves as an isolation transformer for said output module.

15. The method as recited in claim 11 further comprising filtering said DC output power.

16. The method as recited in claim 11 wherein said step-up transformer has a turns ratio substantially equaling a reciprocal turns ratio of said step-down transformer.

17. The method as recited in claim 11 wherein said main power switch is a field-effect transistor (FET).

18. The method as recited in claim 11 further comprising filtering said intermediate power.

19. The method as recited in claim 11 further comprising rectifying said input power.

20. The method as recited in claim 11 wherein said output rectifier comprises at least one rectifier diode.