JP2011146534A - Converter transformer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a converter transformer which simplifies a winding structure for improved productivity and is superior in mass-productivity, and makes insulation design without fail and generate voids around individual secondary coils for improving cooling and improved reliability. <P>SOLUTION: The converter transformer has a structure having a secondary winding of split winding, and includes a plurality of insulating plates in which holes are arranged with a predetermined interval via an insulating spacer, with the centers of the holes on the same axis; a protruding part of insulating material provided around the hole on one surface of the insulating plates; a secondary winding provided on the outer periphery of the protruding part, corresponding to respective insulating plates; a primary winding inserted in the hole of a plurality of insulating plates, and an iron core provided inside the primary winding. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a converter transformer in which a secondary winding has a split winding configuration.

  A transformer for a DC / DC converter that generates a high voltage is configured by winding a multi-layer insulating paper because an insulation distance is required for a withstand voltage between the primary and secondary windings.

  In a high power converter transformer, the loss of the secondary winding is large, and waste heat is required.

  FIG. 3 is a partially cutaway front view showing a conventional high voltage converter transformer. In FIG. 3, 11 is a primary winding, 12 is a secondary winding in a split winding configuration, 13 is an internal insulating paper, 14 is an external insulating paper, 15 is an iron core (core), and 16 is a gap.

  As shown in FIG. 3, a gap 16 is formed around the primary winding 11 and the secondary winding 12, and heat is radiated by circulating oil or the like in the gap 16.

  However, in the design that miniaturizes the transformer, it is difficult to secure a sufficient gap, and cooling by oil flow is not sufficient even in cooling in oil.

Japanese Patent Laid-Open No. 10-163044 JP-A-8-298218

  The object of the present invention is to simplify the winding structure, improve manufacturability, excel in mass production, and ensure insulation design, create air gaps around each secondary winding, and improve cooling It is an object of the present invention to provide a converter transformer with improved reliability.

  In order to solve the above-described problems, the present invention provides a converter transformer having a split winding configuration in which the secondary winding is provided with a hole, and an insulating spacer is provided so that the center of the hole is on the same axis. A plurality of insulating plates arranged at predetermined intervals; a protruding portion made of an insulator provided around the hole on one surface of each insulating plate; and a corresponding protruding portion of each insulating plate. A secondary winding provided on the outer periphery, a primary winding inserted into holes of the plurality of insulating plates, and an iron core provided inside the primary winding. It is.

  The present invention simplifies the winding structure, improves manufacturability, excels in mass productivity, ensures insulation design, creates air gaps around each secondary winding, improves cooling, and is reliable There is an effect of improving the sex.

(A) is a side view which shows the converter transformer which concerns on embodiment of this invention, (b) is sectional drawing similarly. It is a perspective view which shows a part of converter converter which concerns on embodiment of this invention. It is a partially cutaway front view showing a conventional high voltage converter transformer.

  Hereinafter, embodiments of the present invention will be described in detail.

  FIG. 1A is a side view showing a converter transformer according to an embodiment of the present invention, FIG. 1B is a sectional view thereof, and FIG. 2 is a perspective view showing a part of the converter transformer according to the embodiment of the present invention. In the figure, 21 is a primary winding, 22 is a secondary winding, 23 is an iron core (core), 24 is an insulating plate, 25 is a protrusion, 26 is an insulating spacer, 27 is an insulator, and 28 is a hole.

  As shown in FIGS. 1 and 2, a hole 28 is provided in a substantially central portion of the rectangular insulating plate 24, and a protruding portion made of an insulator is formed around the hole 28 on one surface of the insulating plate 24. 25 protrudes in a cylindrical shape and is provided integrally. A divided secondary winding 22 is provided on the outer periphery of the protruding portion 25 of the insulating plate 24. On the other surface of the insulating plate 24, an insulating spacer 26 made of a plurality of insulators protrudes and is provided integrally. As described above, the projecting portion 25, the secondary winding 22, and the insulating spacer 26 are provided on the insulating plate 24 provided with the holes 28 to form the secondary winding dividing portion.

  A plurality of secondary winding divisions are overlapped and arranged such that one surface of the insulating plate 24 of the other secondary winding division is in contact with the tip of the insulating spacer 26 of the secondary winding division. Established. In this case, the plurality of insulating plates 24 are arranged at predetermined intervals via the insulating spacers 26 so that the centers of the holes 28 are on the same axis.

  A primary winding 21 covered with an insulating material 27 around which insulating paper is wound is inserted into a hole 28 of an insulating plate 24 in which a plurality of secondary winding divisions are stacked, and the primary winding 21 is inserted. An insulated iron core 23 is provided inside the winding 21.

  That is, the secondary side winding of the transformer is divided into windings, and each secondary winding 22 is wound by forming a protruding portion 25 on the insulating plate 24, and withstand voltage is provided by the protruding portion 25, the insulating plate 24, and the insulating spacer 26. And a structure in which a plurality of insulating plates 24 are stacked at a predetermined interval by insulating spacers 26 can create a sufficient gap around the secondary winding 22 to improve exhaust heat in oil.

  A plurality of insulating plates 24 provided with the secondary winding 22 are stacked to constitute a secondary winding of the transformer. The constructed secondary winding is combined with the iron core 23 and the primary winding 21 to constitute a converter transformer.

  By adopting the configuration of the embodiment of the present invention, a gap is formed between the individual secondary windings 22, and the exhaust heat of the high-voltage converter transformer used in oil is greatly improved. By improving exhaust heat, reliability is improved and costs are reduced. Further, the winding structure is simplified, the productivity is improved, the mass productivity is excellent, and the cost is reduced.

  The embodiment of the present invention is mainly a high-efficiency oil-cooled type high-voltage converter transformer that generates a high voltage of 10 kv or more, and in an oil, the insulation design is ensured, and each secondary winding A void can be created around the wire to improve oil cooling.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Further, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, you may combine suitably the component covering different embodiment.

  DESCRIPTION OF SYMBOLS 21 ... Primary winding, 22 ... Secondary winding, 23 ... Iron core (core), 24 ... Insulating plate, 25 ... Projection part, 26 ... Insulating spacer, 27 ... Insulator, 28 ... Hole.

Claims (1)

The secondary winding is a converter transformer having a split winding configuration,
A plurality of insulating plates provided with a predetermined interval through insulating spacers so that a hole is provided and the center of the hole is on the same axis;
A protrusion made of an insulator provided around the hole on one surface of each insulating plate;
A secondary winding provided on an outer periphery of the protrusion corresponding to each of the insulating plates;
Primary windings inserted into holes of the plurality of insulating plates;
A converter transformer comprising an iron core provided inside the primary winding.

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