BALANCING ASSEMBLY FOR PARALLELLED RECTIFIERS

• US 3,842,336 A
• Filed: 10/05/1973
• Issued: 10/15/1974
• Est. Priority Date: 10/05/1973
• Status: Expired due to Term

• Current Assignee: Pioneer Electronics (USA) Incorporated (Pioneer Corporation)
• Original Assignee: OXY Metal Industries Corporation
• Inventors: Galloway, James H.
• Primary Examiner(s): Shoop, William M.
• Application Number:
  US05/404,097
• Time in Patent Office: 375 Days
• Field of Search: 321/8,27R
• US Class Current: 363/70
• CPC Class Codes: H02M 7/17 arranged for operation in parallel

Abstract

A rectifier assembly which incorporates a plurality of parallelled rectifier devices, such as thyristors, wherein the inductance of the various parallelled legs are forced to be approximately equal. This is accomplished by creating an equal self-inductance component by insuring that the area enclosed within any conductive path including a single leg is equal to the area enclosed within a conductive path of any other single rectifier leg. Further, the assembly is provided with an additional end turn in the buss work which causes the end leg of the ladder network of parallelled rectifier devices to react as though it were in the center of an infinite string of parallelled rectifier devices. The purpose of the foregoing abstract is to enable the Patent office and the public generally, and especially the scientists, engineers or practitioners in the art who are not familiar with patent or legal terms of phraseology, to determine quickly from a cursory inspection the nature and essence of the technical disclosure of the application. The abstract is neither intended to define the invention of the application, which is measured by the claims, nor is it intended to be limiting as to the scope of the invention in any way.

Claims

1. In a power converter system for converting an alternating source of electrical energy for use by a direct current load, the converter system having a plurality of rectifier elements connected in a finite system of parallel legs connected between said source and load, the improvement comprising means for equalizing the flux created by the self impedance of each leg having current flow including an alternating current buss connected to the source for feeding energy to the rectifier system, a distribution buss connected to the alternating current buss at one point thereof and connected to the rectifier elements at various points along the length thereof, and a collection buss connected to the load at one point thereof and to the rectifier elements at various points along the length thereof, said alternating current buss, said distribution buss and said collection buss forming an isosceles triangle when viewed axially of said busses.

2. The improvement of claim 1 wherein said alternating current buss, said distribution buss and said collection buss are generally parallel.

3. The improvement of claim 2 wherein said isosceles triangle encloses a minimal area.

4. The improvement of claim 2 wherein said alternating current buss has a longitudinal dimension in a first direction, said equalizing means further including collection buss means connecting said alternating current buss and said distribution buss at one end of each of said busses, said rectifier elements being mounted on said collection buss, and conductor means interconnecting said distribution buss and said rectifier elements.

5. The improvement of claim 4 wherein said equalizing means further includes delay reactor meaNs mounted on said distribution buss, each leg including one of said delay reactors.

6. The improvement of claim 5 further including a direct current output buss connected to said collection buss.

7. In a power converter system for converting an alternating current source of electrical energy for use by a direct current load, the converter system having a plurality of rectifier elements connected in a finite string of parallel legs connected between said source and load, the improvement comprising means for equalizing the flux created between the mutual impedance of each leg having current flow, said equilizing means including current carrying buss means mounted in proximity to at least one end leg of said finite string, said buss means carrying current and creating a field to simulate an infinite string of parallel legs above said end leg.

8. The improvement of claim 7 wherein said system includes an alternating current buss connected to the source for feeding energy to the rectifier system, and a distribution buss connected to the alternating current buss at one end thereof to one end of said alternating current buss through said equalizing means.

9. The improvement of claim 8 wherein said alternating current buss and said distribution buss are generally parallel, said connection between said alternating current buss and said distribution buss being formed by a connection buss, said connection buss forming a loop between said alternating current buss and said distribution buss and having a leg parallel to said upper leg of said rectifier elements.

10. The improvement of claim 9 wherein said rectifier elements are connected in a parallel string and being positioned to be mechanically parallel, one relative to the others.

11. The improvement of claim 10 wherein said equalizing means is formed as an end turn between said alternating current buss and said distribution buss, said end turn forming a five segment helix when viewed along the longitudinal axis of said alternating current buss and said distribution buss, said first, third and fifth segments being parallel with each other.

12. The improvement of claim 11 wherein said fifth segment is longitudinally spaced from said third element in a direction along the longitudinal axis of said alternating current and distribution busses.

13. The improvement of claim 12 wherein said fifth segment is spaced a large distance from said third segment relative to the spacing between said fifth segment and said first segment.

14. The improvement of claim 2 further including means for equalizing the flux created between the mutual impedance of each leg having current flow, said equalizing means including current carrying buss means mounted in proximity to at least one end leg of said finite string, said buss means carrying current and creating a field to simulate an infinite string of parallel legs above said end leg.

15. The improvement of claim 14 wherein said distribution buss is connected to the alternating current buss at one end thereof to one end of said alternating current buss through said equalizing means.

16. The improvement of claim 15 wherein said connection between said alternating current buss and said distribution buss being formed by a connection buss, said connection buss forming a loop between said alternating current buss and said distribution buss and having a leg parallel to said upper leg of said rectifier elements.

17. The improvement of claim 16 wherein said rectifier elements are connected in a parallel string and being positioned to be mechanically parallel, one relative to the others.

18. The improvement of claim 17 wherein said equalizing means is formed as an end turn between said alternating current buss and said distribution buss, said end turn forming a five segment helix when viewed along the longitudinal axis of said alternating current buss and said distribution buss, said first, third and fifth segments being parallel with each other.

19. The improvement of claim 18 whErein said fifth segment is longitudinally spaced from said third element in a direction along the longitudinal axis of said alternating current and distribution busses.

20. The improvement of claim 19 wherein said fifth segment is spaced a large distance from said third segment relative to the spacing between said fifth segment and said first segment.