Power bus for distributed ride through capability

• US 7,049,710 B2
• Filed: 11/05/2002
• Issued: 05/23/2006
• Est. Priority Date: 11/05/2002
• Status: Expired due to Fees

• Current Assignee: Square D Company (Schneider Electric SE)
• Original Assignee: Square D Company (Schneider Electric SE)
• Inventors: Dahlman, Mark C.
• Primary Examiner(s): Sircus, Brian
• Assistant Examiner(s): KAPLAN, HAL IRA
• Application Number:
  US10/288,856
• Publication Number:
  US 20040085693A1
• Time in Patent Office: 1,295 Days
• Field of Search: 307/20, 307/48, 307/109
• US Class Current: 307/48
• CPC Class Codes: H02J 7/345 using capacitors as storage or buffering devices

Abstract

A monitoring system includes a power source, a power bus coupled to said power source, a plurality of power taps coupled to said power bus, each of said power taps having a ride-through capacitor operatively coupled thereto to provide power during brief interruptions in the power supply to said power bus by said power source.

Claims

1. A power meter system that monitors electrical power characteristics of an electrical circuit connected to a power system, including:

a power bus having a power bus voltage coupled to a power source having a power source voltage;

a power converter coupled to said power source, said power converter converting said power source voltage to said power bus voltage and electrically isolating said power source from said power bus of said power meter system; and

a plurality of power taps coupled to said power bus,

each of said power taps having a ride-through capacitor operatively coupled thereto to provide power to a circuit coupled with said power tap during brief interruptions in said power source to each of said respective power taps, each of said power taps further having a voltage regulator for converting the bus voltage of said power bus to the circuit voltage required for said circuit coupled with said power tap.

2. The system of claim 1 further including a main metering circuitry coupled with one of said power taps.

3. The system of claim 2 and further including a communication module operatively coupled with one of said power taps.

4. The system of claim 2 and further including an input/output module operatively coupled with one of said power taps.

5. The system of claim 3 and further including an input/output module operatively coupled with one of said power taps.

6. The system of claim 2 wherein said power source comprises an offline power source.

22. The power monitoring system of claim 1, wherein said power bus voltage is a DC voltage.

7. A method of providing power to a power meter during brief interruptions in a power source, comprising:

converting, in a power converter, a power source voltage of a power source to a power bus voltage of a power bus;

electrically isolating, via said power converter, said power source from said power bus;

coupling, through said power converter, said power bus to said power source supplying power to said power meter; and

connecting a plurality of detachable modules to said power bus, each of said detachable modules including a circuit that receives power from a voltage regulator coupled thereto and to a ride-through capacitor that stores energy to power said circuit during brief interruptions in said power source.

8. The method of claim 7 wherein each voltage regulator electrically isolates said circuit from said power bus.

9. The method of claim 7, further comprising coupling a main metering system to one of said detachable modules.

10. The method of claim 9, wherein one of said detachable modules includes a communication module that communicates at least meter data to a remote location.

11. The method of claim 9, wherein one of said detachable modules includes an input/output module.

12. The method of claim 9, wherein said power bus voltage is a DC voltage.

13. The method of claim 9 wherein said power source comprises an offline power source.

14. The method of claim 9 further comprising sizing each ride-through capacitor according to a stored energy equation as a function of at least the drop out voltage of said voltage regulator coupled to said ride-through capacitor.

15. An expandable power meter system for compensating for brief interruptions in supply power, comprising:

a base unit coupled to a power source, said base unit including a power converter and a power bus having an associated power bus voltage, said power converter converting the voltage of said power source of said expandable power meter system to said power bus voltage; and

a plurality of modules operatively coupled to said base unit via said power bus, each of said modules including a ride-through capacitor, a voltage regulator coupled to said ride-through capacitor, and an electrical circuit that receives power from said voltage regulator, wherein said ride-through capacitor provides power to each of said respective modules during brief interruptions in the power supplied from said power source, and wherein said voltage regulator converts said power bus voltage to the voltage for said electrical circuit.

16. The system of claim 15 wherein said electrical circuit of a first one of said plurality of modules is a main metering circuit.

17. The system of claim 16 wherein said electrical circuit of a second one of said plurality of modules is a communication circuit.

18. The system of claim 16 wherein said electrical circuit of a third one of said plurality of modules is an input/output circuit.

19. The system of claim 16 wherein said power source is an offline power source.

20. The system of claim 15 wherein said power converter provides electrical isolation between said power source and said power bus.

21. The system of claim 15, wherein the size of each ride-through capacitor is given by a stored energy equation.

23. The expandable power meter system of claim 15, wherein said power bus voltage is a DC voltage.