High voltage isolating transformer module with substrates separated by a fixed distance

• US 5,757,258 A
• Filed: 05/31/1996
• Issued: 05/26/1998
• Est. Priority Date: 06/02/1995
• Status: Expired due to Fees

• Current Assignee: International Power PLC (Gdf Suez)
• Original Assignee: International Power PLC (Gdf Suez)
• Inventors: Krichtafovitch, Igor A., Sinitsyna, Irina Z.
• Primary Examiner(s): Wong, Peter S.
• Assistant Examiner(s): Vu, Bao Q.
• Application Number:
  US08/656,162
• Time in Patent Office: 725 Days
• Field of Search: 336/65, 336/90, 336/92, 336/184, 336/210, 363/17, 363/144, 363/147, 363/146
• US Class Current: 336/65
• CPC Class Codes: H01F 2019/085 Transformer for galvanic isolation
• CPC Class Codes: H01F 2038/006 matrix transformer consisting of several interconnected individual transformers working as a whole
• CPC Class Codes: H01F 27/266 Fastening or mounting the core on casing or support on coil H01F27/30
• CPC Class Codes: H01F 27/306 Fastening or mounting coils or windings on core, casing or other support
• CPC Class Codes: H01F 30/10 Single-phase transformers H01F30/16 takes precedence
• CPC Class Codes: H01F 38/16 Cascade transformers, e.g. for use with extra high tension

Abstract

A high voltage transformer module (50) having a pair of high voltage substrates (64, 66) and a pair of low voltage substrates (62, 68) on which high and low voltage components are respectfully mounted. Mounted between the substrates are a plurality of transformers (92a, 92b, . . . 92n). In a preferred embodiment, each of the plurality of transformers is coupled to a full bridge rectifier (102a, 102b, . . . 102n) and the outputs of the rectifiers connected so that an output voltage produced by each transformer/rectifier pair is summed to produce a total output voltage for the high voltage transformer module. Electrical shorts are prevented within the module by fixedly mounting the substrates in the casing and by filling the cavities formed between the substrates with insulation having a high breakdown voltage. The components on the high voltage substrates are both physically and electrically isolated from the components on the low voltage substrates.

Claims

1. A transformer module comprising:

(a) a first substrate formed with a plurality of holes;

(b) a second substrate;

(c) standoff means supporting the first and second substrates and fixing the first substrate at a distance from the second substrate;

(d) a plurality of transformer stages mounted on the first and second substrates, each of the plurality of transformer stages comprising;

(i) a core mounted on the second substrate, the core extending through the plurality of holes in the first substrate;

(ii) a primary winding surrounding the core; and

(iii) a secondary winding mounted on the first substrate, the secondary winding surrounding the core at a distance, wherein a current through the primary winding will induce a current through the secondary winding and generate a voltage across the transformer stage; and

(e) insulation for insulating the primary winding and the core from the secondary winding.

2. The transformer module of claim 1, wherein at least two of the plurality of transformer stages are connected so that the voltage generated across the connected transformer stages is combined to produce an output voltage for the transformer module.

3. The transformer module of claim 1, wherein each of the plurality of transformer stages further comprises a conditioning circuit connected across the secondary winding.

4. The transformer module of claim 3, wherein the conditioning circuit is mounted on the first substrate.

5. The transformer module of claim 3 wherein the conditioning circuit is a full bridge rectifier.

6. The transformer module of claim 5, wherein an output from each full bridge rectifier is combined so that the output voltage is equal to a sum of the output voltages produced by each full bridge rectifier.

7. The transformer module of claim 1, further comprising a case surrounding the first substrate, the second substrate, the standoff means, and the plurality of transformer stages.

8. The transformer module of claim 1, wherein a cavity bounded by the first substrate and the second substrate is filled with insulation.

9. The transformer module of claim 8, wherein the insulation has a high breakdown voltage.

10. The transformer module of claim 9, wherein the insulation is mineral oil.

11. The transformer module of claim 7, wherein the standoff means are parallel slots formed in opposing walls of the case.

12. The transformer module of claim 1, wherein the standoff means comprises:

(a) a plurality of spacers; and

(b) means to secure the plurality of spacers between the first and the second substrates to maintain the distance between the first and second substrates.

13. A transformer module comprising:

(a) a pair of high voltage substrates formed with a plurality of holes;

(b) a pair of low voltage substrates;

(c) standoff means supporting the pair of high voltage substrates and the pair of low voltage substrates, the pair of high voltage substrates located adjacent each other and maintained a distance apart by the standoff means, the pair of low voltage substrates surrounding the pair of high voltage substrates and maintained at a distance from the pair of high voltage substrates by the standoff means;

(d) a plurality of transformer stages mounted on the pair of high voltage substrates and the pair of low voltage substrates, each of the plurality of transformer stages comprising;

(i) a core mounted on the pair of low voltage substrates, the core extending between the pair of low voltage substrates and passing through the plurality of holes in each of the pair of high voltage substrates;

(ii) a primary winding surrounding the core; and

(iii) a secondary winding mounted between the pair of high voltage substrates, the secondary winding surrounding the core at a distance, wherein a current through the primary winding will induce a current through the secondary winding and generate a voltage across the transformer stage; and

(e) insulation for insulating the primary winding and the core from the secondary winding.

14. The transformer module of claim 13, wherein the plurality of transformer stages are connected such that the voltage generated across each of the plurality of transformer stages is combined to produce a total output voltage.

15. The transformer module of claim 13, wherein each of the plurality of transformer stages further comprises a conditioning circuit connected across the secondary winding.

16. The transformer module of claim 15, wherein the conditioning circuit is mounted on one of the pair of high voltage substrates.

17. The transformer module of claim 15, wherein an output from each conditioning circuit is connected so that the total output voltage is equal to a sum of the output voltage produced by each conditioning circuit.

18. The transformer module of claim 17, wherein the conditioning circuit is a full bridge rectifier.

19. The transformer module of claim 13, further comprising a case surrounding the pair of high voltage substrates, the pair of low voltage substrates, the standoff means, and the plurality of transformer stages.

20. The transformer module of claim 13, wherein an inner cavity bounded by the pair of high voltage substrates, and intermediate cavities bounded by the pair of high voltage substrates and the pair of low voltage substrates, are filled with insulation.

21. The transformer module of claim 20, wherein the insulation has a high breakdown voltage.

22. The transformer module of claim 20, wherein the insulation is mineral oil.

23. The transformer module of claim 19 wherein the standoff means is parallel slots formed in opposing walls of the case.

24. The transformer module of claim 13, wherein the standoff means comprises:

(a) a plurality of spacers; and

(b) means to secure the plurality of spacers between the pair of high voltage substrates, and between the pair of low voltage substrates and the pair of high voltage substrates, in order to maintain the distance between the low and high voltage substrates.

25. The transformer module of claim 13, further comprising conductive bridges between the pair of low voltage substrates.

26. The transformer module of claim 13, further comprising conductive bridges between the pair of high voltage substrates.

27. A transformer module comprising:

(a) a first substrate formed with a plurality of holes;

(b) a second substrate located at a fixed distance from the first substrate;

(c) a plurality of transformer stages mounted on the first and second substrates, each of the plurality of transformer stages comprising;

(i) a core mounted on the second substrate, the core extending through the plurality of holes in the first substrate;

(ii) a primary winding surrounding the core; and

(iii) a secondary winding mounted on the first substrate, the secondary winding surrounding the core at a distance, wherein a current through the primary winding will induce a current through the secondary winding and generate a voltage across the transformer stage, and

(d) insulation for insulating the primary winding and the core from the secondary winding.

28. The transformer module of claim 27, wherein at least two of the plurality of transformer stages are connected so that the voltage generated across the connected transformer stages is combined to produce an output voltage for the transformer module.

29. The transformer module of claim 27, wherein each of the plurality of transformer stages further comprises a conditioning circuit connected across the secondary winding.

30. The transformer module of claim 29, wherein the conditioning circuit is mounted on the first substrate.

31. The transformer module of claim 29 wherein the conditioning circuit is a full bridge rectifier.

32. The transformer module of claim 31, wherein an output from each full bridge rectifier is combined so that the output voltage is equal to a sum of the output voltages produced by each full bridge rectifier.

33. The transformer module of claim 27, further comprising a case surrounding the first substrate, the second substrate, and the plurality of transformer stages.

34. The transformer module of claim 27, wherein a cavity bounded by the first substrate and the second substrate is filled with insulation.

35. The transformer module of claim 34, wherein the insulation has a high breakdown voltage.

36. The transformer module of claim 35, wherein the insulation is mineral oil.

37. The transformer module of claim 33, further comprising a standoff means supporting the first and second substrates and fixing the first substrate at a distance from the second substrate.

38. The transformer module of claim 37, wherein the standoff means are parallel slots formed in opposing walls of the case.

39. The transformer module of claim 27, further comprising a standoff means supporting the first and second substrates and fixing the first substrate at a distance from the second substrate.

40. The transformer module of claim 39, wherein the standoff means comprises:

(a) a plurality of spacers; and

(b) means to secure the plurality of spacers between the first and the second substrates to maintain the distance between the first and second substrates.