Power conversion system and method

• US 7,596,002 B2
• Filed: 06/25/2004
• Issued: 09/29/2009
• Est. Priority Date: 06/25/2004
• Status: Active Grant

• Current Assignee: General Electric Company
• Original Assignee: General Electric Company
• Inventors: Teichmann, Ralph
• Primary Examiner(s): HAN, YOUNGHUIE JESSICA
• Application Number:
  US10/877,359
• Publication Number:
  US 20050286268A1
• Time in Patent Office: 1,922 Days
• Field of Search: 363/16, 363 18- 26, 363/65, 363/67, 363/68, 363/69, 363/71, 363/98, 318/139
• US Class Current: 363/18
• CPC Class Codes: B23H 3/02 Electric circuits specially adapted therefor, e.g. power supply, control, preventing short circuits
• CPC Class Codes: H02M 3/33523 with galvanic isolation between input and output of both the power stage and the feedback loop

Abstract

A power conversion system comprises a converter coupled to a power source and configured to convert a DC power to a variable AC power signal. The power conversion system may further comprise a process control unit coupled to the converter and configured to control the variable AC power signal. The power conversion system may also further comprise a transformer having a primary side and a secondary side, the primary side receiving the variable AC power signal from the converter and a passive rectifier coupled to the secondary side of the transformer. The transformer may be adapted to provide galvanic isolation between the power source and an electro-chemical process. The passive rectifier is adapted to convert the variable AC power to the variable DC power and to deliver the variable DC power to the electro-chemical processing unit.

Claims

1. A power conversion system, comprising:

a converter coupled to a power source and configured to convert a DC power to a variable AC power signal;

a process control unit coupled to the converter and configured to control at least one characteristic of the variable AC power signal;

a transformer having a primary side and a secondary side, the primary side receiving the variable AC power signal from the converter, the transformer adapted to provide a transformation of current and voltage levels between the power source and an electro-chemical processing unit;

a passive rectifier coupled to the secondary side of the transformer, the passive rectifier being adapted to convert the variable AC power to the variable DC power and to deliver the variable DC power to the electro-chemical processing unit.

2. The system of claim 1, wherein the passive rectifier is a single phase rectifier.

3. The system of claim 1, wherein the passive rectifier is a multi-phase rectifier.

4. The system of claim 1, wherein the passive rectifier is a multi-phase, multi-pulse rectifier.

5. The system of claim 1, wherein the power source is a DC source.

6. The system of claim 1, wherein the power source is an AC source.

7. The system of claim 6, wherein the converter is coupled via a power source rectifier to the AC source.

8. The system of claim 7, further comprising a power quality control unit coupled to the power source rectifier, the power quality control unit being configured to control a quality of input power for the electro-chemical process.

9. The system of claim 1, wherein the converter is a single phase inverter.

10. The system of claim 1, wherein the converter is a multi-phase inverter.

11. The system of claim 1, wherein the converter is a multi-level inverter.

12. The system of claim 1, wherein the transformer is further adapted to provide galvanic isolation between the power source and the electro-chemical processing unit.

13. The system of claim 1, wherein the transformer is a single phase transformer.

14. The system of claim 1, wherein the transformer is a multi-phase transformer.

15. The system of claim 1, wherein the system is adapted for use in a mobile application.

16. The system of claim 1, wherein the system is adapted for use in a wind mill.

17. The system of claim 1, wherein the system is adapted for use in an arc welding process.

18. The system of claim 1, wherein the system is adapted for use in a fuel cell.

19. The system of claim 1, wherein the system is adapted for use in a storage battery.

20. The system of claim 1, wherein the system is adapted for use in a storage capacitor.

21. The system of claim 1, wherein the system is adapted for use in an electrolyzer.

22. A power conversion system, comprising:

a plurality of converters coupled to a power source and configured to convert a DC power to a variable AC power signal;

a process control unit coupled to each one of the plurality of converters and configured to control at least one characteristic the variable AC power signal;

a transformer having a primary side and a secondary side, the primary side receiving the variable AC power signal from the converter, the transformer adapted to provide a transformation of current and voltage levels between the power source and an electro-chemical processing unit; and

a passive rectifier coupled to the secondary side of the transformer, the passive rectifier being adapted to convert the variable AC power to the variable DC power and to deliver the variable DC power to the electro-chemical processing unit.

23. The system of claim 22, wherein the transformer is further adapted to provide galvanic isolation between the power source and the electro-chemical processing unit.

24. The system of claim 22, wherein the plurality of transformers are mutually coupled magnetically.

25. The system of claim 22, wherein the plurality of transformers are arranged in parallel.

26. The system of claim 22, wherein the plurality of transformers are arranged in series.

27. The system of claim 22, wherein the passive rectifier is adapted to provide power to a hydrogen production process.

28. The system of claim 22, wherein the electro-chemical processing unit is adapted to perform an electro-chemical machining process.

29. The system of claim 22, wherein the electro-chemical processing unit is adapted to perform an electro-polishing process.

30. The system of claim 22, wherein the electro-chemical processing unit is adapted to perform an electro-synthesis process.

31. A method of operating a power conversion system, the method comprising:

converting a DC power signal of a DC power source to a variable AC power signal;

employing a transformer having a primary side and a secondary side to provide a transformation of current and voltage levels between the power source and an electro-chemical processing unit;

delivering the variable AC power signal to the primary side of the transformer;

controlling at least one characteristic an output power signal generated on the secondary side of the transformer via a process control unit provided at the primary side of the transformer;

rectifying the output power signal generated at the secondary side of the transformer via a passive rectifier to create a rectified power signal; and

delivering the rectified power signal to the electro-chemical processing unit.

32. The method of claim 31, wherein controlling at least one characteristic the output power signal comprises controlling a plurality of power quality characteristics of the output power signal.

33. The method of claim 32, wherein the power quality characteristic is a magnitude of the output power signal.

34. The method of claim 32, wherein the power quality characteristic is a ripple content of the output power signal.

35. The method of claim 32, wherein the power quality characteristic is a harmonic content of the output power signal.

36. The method of claim 31, further comprising providing galvanic isolation between the power source and the electro-chemical processing unit via the transformer.

37. The method of claim 31, further comprising converting an AC power signal of an AC power source to the variable DC power signal.

38. A power conversion system, comprising:

a converter coupled to a power source and configured to convert a DC power to an AC power signal;

a transformer having a primary side and a secondary side, the primary side receiving the AC power signal from the converter, the transformer adapted to provide a transformation of current and voltage levels between the power source and an electro-chemical processing unit;

a process control unit coupled to the converter and provided at the primary side of the transformer and configured to control a plurality of quality characteristics of an output power signal generated on the secondary side of the transformer; and

a passive rectifier coupled to the secondary side of the transformer, the passive rectifier being adapted to convert the output power signal to create a rectified power signal and to deliver the rectified power signal to the electro-chemical processing unit.

39. The system of claim 38, wherein the plurality of quality characteristics comprises at least one of a magnitude;

a ripple content;

or a harmonic content of the output power signal.