JP2019110145A - Transformer - Google Patents

Abstract

To improve heat dissipation in regardless of a type of a winding.SOLUTION: A transformer is a transformer comprising a pair of cores, a primary winding and a secondary winding arranged in the pair of cores in order to solve the above problems. At least one of the primary winding and the secondary winding comprises at least two windings having two terminals. One terminal of each winding is connected to a main circuit, and the other terminal is connected so that at least two windings are electrically and serially structured.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a transformer, and more particularly to a transformer suitable for use in an isolated power conversion circuit.

  Generally, a transformer used in an insulation type power converter is driven at a high frequency of several tens of kHz to 100 kHz from the viewpoint of miniaturization. When driving a transformer at high frequency, the increase in conduction loss due to the AC resistance of the winding becomes a problem. In order to solve this problem, a structure has been proposed in which alternating current resistance is reduced by using a litz wire for the winding, or a heat dissipation property of the winding itself is improved by using a flat winding.

  However, power conversion devices mounted in automobiles and the like are increasing in power, and transformers used in such power conversion devices for high power use have a large amount of current flowing in the windings and thus cooling of the windings. Is an issue.

  Also, in recent years, application of a solid state transformer (hereinafter referred to as SST) has been considered, in which a commercial transformer used for grid connection is miniaturized by increasing its frequency. The SST includes a high frequency transformer driven at a high frequency of several tens to 100 kHz, a converter for driving the high frequency transformer, an inverter using an output voltage of the converter as a power supply and outputting an alternating voltage of several tens Hz equal to the system frequency. The power converter of the present invention is a substitute for the conventional commercial transformer.

  According to such a configuration of SST, a power converter such as a converter or an inverter is added to a conventional isolated transformer alone, but downsizing of the transformer by driving with a high frequency of about several tens to 100 kHz Even in the configuration of the SST to which a power converter is added, significant reduction in size and weight can be realized as compared with a conventional commercial transformer alone driven at several tens Hz.

  As described above, the SST functions as a commercial transformer, and the SST itself also functions as a power converter.

  As a specific configuration example of a power conversion device using SST, for example, the configuration disclosed in Non-Patent Document 1 has been proposed. In the power conversion device described in Non-Patent Document 1, a large capacity, low withstand voltage power conversion device using a transformer driven at a high frequency is connected in many parallels and many parallels to be applied to high voltage and high power applications. It is possible to do that. Since high voltage is superimposed on the winding of the transformer formed by connecting in series with respect to the ground, it is necessary to secure insulation between the windings. In order to ensure this insulation, it is effective to use a winding cover for physically shielding one of the windings with an insulator, but it is difficult to cool the winding covered by the winding cover. There is.

  As a technique for improving the heat dissipation of the winding with respect to such problems, there is one described in Patent Document 1. In the technique described in Patent Document 1, the heat radiation property of the winding is improved by connecting a part of the flat winding to the metal casing via the extraction sheet.

JP 2004-303823 A

Chounhong Zhao, Silvia Lewdeni-Schmid, Juergen K. Steinke, Michael Weiss, Toufann Chaudhuri, Marc Pellerin, Joeph Duron and Philippe Stefanutti: "Design, Implementation and Performance of a Modular Power Electronic Transformer for Railway Application", Proceedings of the 13th Conference on Power Electronics and Applications, pp. 1-10 (2011)

  However, in the technique described in Patent Document 1 described above, it is necessary to draw out a part of the winding in order to enhance the heat dissipation of the winding, so it is difficult to secure insulation between the winding and the core. There is. Further, in the technology described in Patent Document 1, a flat winding is assumed, and there is a problem that it is difficult to apply to the case where a single wire or a litz wire is used for the winding.

  The present invention has been made in view of the above-described point, and an object of the present invention is to provide a transformer capable of improving the heat dissipation regardless of the type of winding.

A transformer according to the present invention is a transformer comprising a pair of cores and a primary winding and a secondary winding disposed in the pair of cores to achieve the above object, wherein the primary is At least one of the winding and the secondary winding includes at least two windings having two terminals, one terminal of the winding is connected to the main circuit, and the other terminal is at least two of the two. It is characterized in that the windings are electrically connected in series configuration.
It is characterized by

  According to the present invention, heat dissipation can be improved regardless of the type of winding.

It is an exploded perspective view showing Example 1 of a transformer of the present invention. FIG. 2 is a cross-sectional view of a cross section taken along the line A-B of FIG. 1 as viewed from the Y-axis direction. BRIEF DESCRIPTION OF THE DRAWINGS It is an electric circuit diagram of the power converter device which mounts Example 1 of the transformer of this invention. BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing which shows the power converter device carrying Example 1 of the transformer of this invention. It is a figure which shows the modification of Example 1 of the transformer of this invention, and is equivalent to FIG. It is a disassembled perspective view which shows Example 2 of the transformer of this invention. FIG. 7 is a side view, partly in cross section, of the transformer of the second embodiment of FIG. 6 as viewed from the X-axis direction. It is an exploded perspective view showing Example 3 of a transformer of the present invention. It is sectional drawing along the C-D line of FIG. It is the side view which looked at the transformer of Example 3 of FIG. 8 from Z-Y surface. It is a disassembled perspective view which shows Example 4 of the transformer of this invention. It is sectional drawing along the EF line | wire of FIG. It is a side view which shows partially cross-sectionally the Example 4 of the transformer of this invention.

  Hereinafter, the transformer of the present invention will be described based on the illustrated embodiment. In each embodiment, the same reference numeral is used for the same component.

  1 to 3 show a first embodiment of a transformer according to the present invention. 1 is an exploded perspective view showing a first embodiment of a transformer according to the present invention, FIG. 2 is a cross-sectional view of a cross section taken along line A-B in FIG. 1 as viewed from the Y-axis direction, and FIG. It is an electrical circuit diagram of a power converter equipped with an example transformer.

  As shown in FIGS. 1 and 2, the transformer 1 of this embodiment includes a pair of cores 21 and 22 having a U-shaped cross section, and a primary disposed within the pair of cores 21 and 22 having a U-shaped cross section. A winding 3 and a secondary winding 4 and a winding cover 5 covering the bottom and the circumferential surface of the secondary winding 4 are schematically shown. The transformer 1 thus configured is, as shown in FIG. 3, from the primary winding 3 (N1 in FIG. 3) connected to the low voltage side primary circuit 81 to the high voltage secondary circuit 82. Power is transmitted to the connected secondary winding 4 (N2 in FIG. 3).

  The pair of cores 21 and 22 having a U-shaped cross section described above has two openings as shown in FIG. That is, the core 21 is formed in a U-shaped cross section including the bottom 21a and the side wall 21b, and the core 22 is formed in a U-shaped cross section including the bottom 22a and the side wall 22b. The end portions in the lateral (left and right) direction of FIG. 1 of a pair of cores 21 and 22 which are formed with central cores 21A and 22A positioned at the central portions of 21a and 22a and have a U-shaped cross section are openings and It has become.

  Further, as shown in FIG. 1 and FIG. 2, the primary winding 3 is composed of a bobbin 31, a winding 32 wound around the bobbin 31, and a terminal 33 of the winding 32. The terminal 33 is fixed to the terminal portion 34 of the bobbin 31 by a screw 71 which is a fastening member, and is connected to the primary circuit 81 shown in FIG.

  On the other hand, the secondary winding 4 includes a bobbin 41, and windings 42a and 42b and terminals 43a of the windings 42a and 42b, which are wound in grooves formed by being divided into upper and lower portions around the bobbin 41, The terminal 43a of the winding 42a and the terminal 43c of the winding 42b are fixed to the terminal portion 44a of the bobbin 41 via the connection plate 6 with the screw 72 serving as a fastening member. Thus, the terminal 43a of the winding 42a and the terminal 43c of the winding 42b are electrically connected. The terminal 43b of the winding 42a and 43d of the winding 42b are fixed to the terminal portion 44b of the bobbin 41 by a screw 73, which is a fastening member, and connected to the secondary circuit 82 shown in FIG.

  Furthermore, the winding cover 5 is formed in a recessed shape so as to cover the bottoms and circumferential surfaces of the windings 42 a and 42 b of the secondary winding 4, and the recess of the winding cover 5 By arranging the windings 42a and 42b, the bottoms and circumferential surfaces of the windings 42a and 42b of the secondary winding 4 can be covered with the winding cover 5, and the portions other than the terminal portions 44a and 44b are not exposed. The insulation distance between the primary winding 3 and the secondary winding 4 is secured.

  Further, a through hole is formed in the central portion of primary winding 3 and secondary winding 4 and winding cover 5, and the center cores 21 A and 22 A in cores 21 and 22 are primary through the above-mentioned through holes. By inserting the winding 3, the secondary winding 4 and the winding cover 5, the primary winding 3, the secondary winding 4 and the winding cover 5 are integrated to form a transformer 1 as shown in FIG. 2. Ru.

  In this embodiment, the connection plate 6 is disposed between the terminal 43a of the winding 42a and 43c of the winding 42b and the screw 72. However, the connection plate 6 may be embedded in the terminal portion 44a of the bobbin 41.

  Next, the structure in the case where the transformer of the present embodiment is mounted on a power converter will be described using FIG.

  In the power converter shown in FIG. 4, the primary circuit 81 and the secondary circuit 82 are disposed to face each other, and the primary circuit 81 and the secondary circuit 82 are connected to be connected to the transformer 1 having the above-described configuration, respectively. Terminal portions 181 and 182 are provided. The transformer 1 is disposed in a housing 10b in which the terminal portion 44b (see FIG. 1) of the bobbin 41 is in proximity to the connection terminal portion 182 of the secondary circuit 82, and the core 22 is made of metal or resin. Is held by Although not described in FIG. 4, a housing for connecting the housing 10 a and the housing 10 b is disposed on the ZX plane.

  Further, the cooling fan 12 is disposed at one end of the casings 10a and 10b, and by applying cooling air to the transformer 1, the primary circuit 81, and the secondary circuit 82, the windings 32, 42a and 42b and the cores 21 and 22 are provided. Is cooled. The connection terminal portion 181 of the primary circuit 81 and the terminal portion 34 of the primary winding 3 are connected using the bus bar 91, and the connection terminal portion 182 of the secondary circuit 4 and the terminal portion 44b of the secondary winding using the bus bar 92 It is connected.

  Although not shown in FIG. 4, a support member for holding the secondary circuit 82 may be provided between the primary circuit 81 and the secondary circuit 82.

  Thus, the secondary winding 4 is divided into a plurality of upper and lower parts like windings 42a and 42b wound in a groove formed by being divided into two parts up and down around the bobbin 41 and connected to the main circuit The main circuit is provided with terminal portions 44a and 44b of the bobbin 41 different from the terminal portions to be connected, and one end of the winding is connected such that the divided windings 42a and 42b are electrically connected in series. The heat dissipation can be improved as compared with a transformer provided with only a terminal part connected to the.

  This makes it possible to improve the heat dissipation of the winding while securing the insulation between the windings, so that the primary winding 3 and the secondary winding 4 can be brought close to each other through the winding cover 5 The size of the transformer can be reduced. Further, by providing terminal portions connected to the main circuit at different openings of the cores 21 and 22 by the primary winding 3 and the secondary winding 4, insulation distance of wiring connected to the main circuit is secured. It becomes possible.

  In the present embodiment, the primary winding 3 and the secondary winding 4 are single wires, but litz wires may be used. Further, a heat sink made of ceramic, aluminum or the like may be provided between the terminal portion 44 a and the connection plate 6. For example, as shown in FIG. 5, the heat sink 61 may be connected to the terminals 43a and 43c, and the heat may be released from the heat sink 61 to the core 21. In this case, in order to ensure insulation between the core 21 and the secondary winding 4, an insulator may be interposed between the terminals 43 a and 43 c and the heat sink 61.

  Further, in FIG. 5, although the heat sink 61 is connected to the core 21, the heat sink 61 may be connected to a case disposed on the bottom surface of the core 22. By connecting to the housing, further improvement of the heat dissipation performance can be expected. In addition, although the PQ core is used for the core of this embodiment, it is apparent that the same effect can be obtained by using an E-type or UU core.

  6 and 7 show a second embodiment of the transformer of the present invention. 6 is an exploded perspective view showing a second embodiment of a transformer according to the present invention, and FIG. 7 is a side view of the transformer of FIG. 6 partially sectioned and viewed from the X-axis direction.

  The transformer 201 of this embodiment shown in the figure includes a pair of cores 21 and 22 having a U-shaped cross section and primary windings 3 and 2 disposed in the pair of cores 21 and 22 having a U-shaped cross section. It is roughly configured of a winding 204 and a winding cover 205 that covers the bottom and circumferential surface of the secondary winding 204, and transmits power from the primary winding 3 to the secondary winding 204.

  Here, the transformer 201 of the present embodiment will be described focusing on the configuration of the secondary winding 204 different from the transformer 1 of the first embodiment.

  As shown in FIG. 6, the secondary winding 204 in the transformer 201 of this embodiment includes a bobbin 241 and three turns wound around a groove formed by being divided up and down around the bobbin 241. Wires 242a, 242b, 242c, six terminals 243a, 243b, 243c, 243d, 243f of the three windings 242a, 242b, 242c, a connection plate 206a connecting the terminal 243d and the terminal 243f, and a terminal 243b It is comprised with the connection board 206b which connects the terminal 243c.

  The terminals 243a and 243e are fixed to the terminal portion 244a provided on the bobbin 241 by using a screw 72 which is a fastening member, and are connected to the secondary circuit. On the other hand, the terminal 243b and the terminal 243c are fixed to the terminal portion 244b of the bobbin 241 via the connection plate 206b, and the terminal 243d and the terminal 243f are fixed to the terminal portion 244b of the bobbin 241 via the connection plate 206a. 242c are electrically connected in series.

  In addition, the winding cover 205 is located on the side where the terminal portion 244a connected to the main circuit is located, and at a portion located at the opening of the left end portion of FIG. It is set as the structure provided with the notch part 205A.

  Thus, in the transformer 201 of the present embodiment, the three windings 242a, 242b and 242c are wound in the groove formed by dividing the secondary winding 204 into three in the upper and lower portions around the bobbin 241. As described above, by dividing the winding into three parts, the length of the winding between the terminals can be shortened as compared with the transformer 1 of the first embodiment. That is, since the number of turns of one winding can be reduced by dividing the secondary winding 204 into three windings 242a, 242b, 242c, the length of the winding between the terminals can be shortened. Thus, the heat dissipation of the winding can be improved.

  In addition, when the wind tunnel is configured such that the cooling air flows in the direction from the terminal portion 244a to the terminal portion 244b by forming the notch portion 205A in a part of the winding cover 205, the terminal portion 244a. Since an air path in which the cooling air flows from the coil to the terminals 243b, 234c, 243d, and 234f via the windings is formed, it is possible to improve the heat dissipation from the terminals. In other words, when incorporating the secondary winding 204 into the recess of the winding cover 205, the notch of the winding cover 205 can be obtained by incorporating a space between the winding cover 205 and the windings 242a, 242b, 242c. Since the cooling air flows from the portion 205A through the space as an air path, it is possible to improve the heat dissipation from the terminals 243b, 243c, 243d, and 234f.

  Although not shown in the present embodiment, a heat sink may be added between the terminals 243b, 243c, 243d, 234f and the terminal portion 244b.

  8, 9 and 10 show a third embodiment of the transformer of the present invention. 8 is an exploded perspective view showing a third embodiment of the transformer of the present invention, FIG. 9 is a cross-sectional view of the transformer of FIG. 8 taken along line C-D, and FIG. It is the side view seen from-Y side.

  Similar to the transformer 1 described in the first embodiment, the transformer 301 of the present embodiment shown in the figure includes a pair of cores 21 and 22 having a U-shaped cross section, and a pair of cores 21 having the U-shaped cross section, 22 schematically includes a primary winding 3 and a secondary winding 304 which are disposed in a housing 22 and a winding cover 305 which covers the periphery of the secondary winding 304, and power is transmitted from the primary winding 3 to the secondary winding 304. Is being transmitted.

  Here, the transformer 301 of the present embodiment will be described focusing on differences from the transformer 1 of the first embodiment.

  The secondary winding 304 in the transformer 301 of this embodiment is formed around two bobbins 341a and 341b, a winding 342a wound in a groove formed around the bobbin 341a, and a bobbin 341b. Windings 342c wound in the groove, flat plate-like winding 342b disposed between the winding 342a and the winding 342c, and a heat dissipating sheet such as silicone or a resin having a higher heat dissipation than the bobbins 341a and 341b The heat dissipating member 11a disposed in the space of the bobbin 341a and the heat dissipating member 11b disposed in the space of the bobbin 341b, the terminals 343a and 343c of the winding 342a, the terminals 343d and 343e of the flat winding 342b, and the winding Connect the terminals 343b and 343f of the wire 342c, the terminal portion 344b and the terminal 343c, and the terminal 343d of the flat winding 342b Connection plate 306a and the terminal portion 344b, the terminal 343e of the flat winding 342b, the connection plate 306b connecting the terminal 343f of the winding 342c, and the terminal 343d of the flat winding 342b made of ceramic, aluminum or the like. A heat dissipation plate 362 is connected to 343 e via the insulating plate 312.

  A litz wire is used for the windings 342a and 342c, and a flat winding is used for the winding 342b. The bobbin 341a on which the winding 342a is wound and the bobbin 341b on which the winding 342c is wound are physically divided. A possible configuration is such that the winding 342b is sandwiched between the winding 342a and the winding 342c.

  Further, as described above, the bobbins 341a and 341b are provided with a space in the axial direction (vertical direction in FIG. 8), and in this space, the heat dissipation members 11a and 11b are in contact with the winding 342b. It is arranged. Furthermore, the terminal 343a of the winding 342a and 343b of the winding 342c are fixed to the terminal portion 344a of the bobbin 341b and connected to the secondary circuit, and the terminal 343c of the winding 342a and the terminal 343d of the flat winding 342b are The terminal portion 344b and the terminal 343e of the flat winding 342b and the terminal 343f of the winding 342c are fixed to the terminal portion 344b via the connection plate 306a via the connection plate 306b.

  Thus, by connecting the terminal 343c of the winding 342a, 343d and 343e of the flat winding 342b, and the terminal 343f of the winding 342c, the windings 342a, 342b, and 342c are electrically connected in series, and flat The heat sink 362 is connected to the terminals 343 c and 343 d of the winding 342 b via the insulating plate 312. Although not shown, the heat sink 362 is connected to a housing in which the transformer 301 is held.

  As described above, in the transformer 301 of the present embodiment, the bobbin of the secondary winding 304 is divided into a plurality of parts (divided into two in the present embodiment), and the flat winding 342b is used as the heat dissipation members 11a and 11b. The flat winding 342b can be used as a heat sink by sandwiching the two bobbins 341a and 341b with each other.

  As a result, in comparison with the transformer 1 described in the first embodiment, it is possible to further improve the heat dissipation of the winding wound around the central portion of the bobbin.

  In the present embodiment, although one flat-shaped winding 342b is provided, a plurality of flat-shaped windings 342b may be provided. In such a case, the bobbin can be divided into three or more parts, and a flat plate-like winding 342b can be interposed between the bobbins, so that further improvement of the heat dissipation of the winding can be expected.

  11, 12 and 13 show a fourth embodiment of the transformer of the present invention. 11 is an exploded perspective view of a transformer according to a fourth embodiment of the present invention, FIG. 12 is a cross-sectional view of the transformer of FIG. 11 along line E-F, and FIG. 13 is a side view of the transformer of FIG. Figure is shown.

  As shown in this figure, the transformer 401 of the present embodiment is, similarly to the transformer 1 of the first embodiment, a pair of cores 21 and 22 having a U-shaped cross section, and a pair of cores 21 having the U-shaped cross section, An electric power is transmitted from the primary winding 403 to the secondary winding 404, which is generally configured by the primary winding 403 and the secondary winding 404 disposed in the reference numeral 22.

  The primary winding 403 in the transformer 401 of this embodiment is wound around the four bobbins 431a, 431b, 431c, 431d consisting of the first, second, third and fourth, and the second bobbin 431b. And a second winding 432b wound around the first winding 432a and the third bobbin 431c, and made of ceramic, aluminum or the like, between the first bobbin 431a and the first winding 432a Between the first heat radiating plate 413a disposed, the second heat radiating plate 413b disposed between the first winding 432a and the second winding 432b, and the second winding 432b and the fourth bobbin 431d From the third heat sink 413c, the terminals 433a and 433c of the first winding 432a, the terminals 433b and 433d of the second winding 432b, and the fourth heat sink 462 made of ceramic, aluminum or the like Schematic configuration It has been.

  On the other hand, the secondary winding 404 in the present embodiment is roughly composed of a bobbin 441, a winding 442 wound around the bobbin 441, and a terminal 443 of the winding 442.

  Further, in the transformer 401 of the present embodiment, a heat dissipation member 11a made of a heat dissipation sheet such as silicone or a resin having a heat dissipation higher than that of the third bobbin 431c is disposed in the space portion of the third bobbin 431c. In the space portion of the bobbin 431b, a heat dissipation member 11b disposed of a heat dissipation sheet such as silicone or a resin having a heat dissipation higher than that of the second bobbin 431b is disposed.

  The fourth bobbin 431 d has terminal portions 434 a and 434 b. One terminal 433 a of the second winding 432 b and one terminal 433 b of the first winding 432 a are one of the fourth bobbin 431 d. It is fixed to the terminal portion 434a and connected to the primary circuit. Further, the other terminal 433c of the second winding 432b and the other terminal 433d of the first winding 432a are fixed to the other terminal portion 434b of the fourth bobbin 431d, and the first winding 432a And the second 432 b are electrically connected in series configuration.

  The first heat dissipation plate 413a, the second heat dissipation plate 413b, and the third heat dissipation plate 413c are in contact with the heat dissipation members 11a and 11b disposed in the space between the second bobbin 431b and the third bobbin 431c. The first heat sink 413a is between the first bobbin 431a and the second bobbin 431b, the second heat sink 413b is between the second bobbin 431b and the third bobbin 431c, and the third heat sink 413c is It is arrange | positioned between the 3rd bobbin 431c and the 4th bobbin 431d, respectively.

  The first heat dissipation plate 413a, the second heat dissipation plate 413b, and the third heat dissipation plate 413c are divided into a plurality in the circumferential direction for the purpose of reducing the generation of eddy current due to the magnetic flux penetrating the heat dissipation plate. It has composition. The first heat dissipation plate 413a, the second heat dissipation plate 413b, and the third heat dissipation plate 413c are fixed to the terminal portion 434b of the fourth bobbin 431d together with the fourth heat dissipation plate 462.

  Note that although insulators are not shown at the connection portions of the first heat dissipation plate 413a, the second heat dissipation plate 413b, and the third heat dissipation plate 413c, and the fourth heat dissipation plate 462 in the drawing, it is possible to use a heat dissipation plate When a metal such as aluminum is used, the connection between the first heat dissipation plate 413a, the second heat dissipation plate 413b and the third heat dissipation plate 413c and the fourth heat dissipation plate 462 is connected via an insulator. It is also good.

  As described above, in the transformer 401 according to the present embodiment, the bobbin is divided into a plurality of parts as in the third embodiment, and the heat dissipation plate is provided between the bobbins in comparison with the first embodiment. The heat dissipation of the winding at the central portion of the bobbin can be improved. Further, by dividing the heat dissipation plate disposed between the bobbins into a plurality of parts in the circumferential direction of the winding, even when metal is used for the heat dissipation plate, the heat dissipation plate itself caused by the generation of the eddy current It is possible to reduce heat generation, and the effect of enhancing the heat dissipation can be expected.

  The present invention is not limited to the embodiments described above, but includes various modifications. For example, the embodiments described above are described in detail in order to explain the present invention in an easy-to-understand manner, and are not necessarily limited to those having all the configurations described. Also, part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. In addition, with respect to a part of the configuration of each embodiment, it is possible to add, delete, and replace other configurations.

  The transformer of the present invention can be applied to an isolated power converter provided with a transformer.

  DESCRIPTION OF SYMBOLS 1, 201, 301, 401 ... Transformer, 3, 403 ... Primary winding, 4, 204, 304, 404 ... Secondary winding, 5, 205, 305 ... Winding cover, 6, 206a, 206b, 306a, 306b ... connection plate, 10a, 10b ... housing, 11a, 11b ... heat radiation member, 12 ... cooling fan, 21, 22 ... core, 21A, 22A ... central core, 21a, 22a ... bottom of core, 21b, 22b ... core Side walls 31, 41, 241, 341a, 341b, 441 ... bobbins, 32, 42a, 42b, 242a, 242b, 242c, 342c, 342c, 442 ... windings, 33, 43a, 43b, 43c, 243a, 243b, 243c, 243d, 243e, 243f, 343a, 343b, 343c, 343f ... terminals of windings, 34, 44a, 44b, 244a, 24 b, 344b, 434a, 434b: terminal portion of bobbin, 71, 72, 73: screw, 81: primary circuit on low voltage side, 82: secondary circuit on high voltage side, 61, 362: radiator plate, 91, 92 ... Bus bar, 181, 182 ... connection terminal portion, 205A ... notch portion, 312 ... insulating plate, 342b ... flat plate winding, 343d, 343e ... flat plate winding terminal, 413a ... first heat radiation plate, 413b ... second heat dissipation plate, 413 c ... third heat dissipation plate, 431 a ... first bobbin, 431 b ... second bobbin, 431 c ... third bobbin, 431 d ... fourth bobbin, 432 a ... first winding , 432b: second winding, 433a, 433c: first winding terminal, 433b, 433d: second winding terminal, 462: fourth heat dissipation plate.

Claims (14)

What is claimed is: 1. A transformer comprising: a pair of cores; and a primary winding and a secondary winding disposed in the pair of cores, the transformer comprising:
At least one of the primary winding or the secondary winding includes at least two windings having two terminals, one terminal of the winding is connected to the main circuit, and the other terminal is at least two. A transformer characterized in that the two windings are electrically connected in a series configuration. In the transformer according to claim 1,
A transformer characterized in that the secondary winding is covered by a winding cover around its periphery. The transformer according to claim 1 or 2
A transformer characterized in that the pair of cores has a U-shaped cross section, and the primary winding and the secondary winding are disposed in the U-shape having a U-shaped cross section. In the transformer according to claim 3,
The pair of cores are each formed in a U-shaped cross section with a bottom and a side wall, and an opening is formed at an end of the core, and one of the windings is the one opening of the core The one terminal of the winding is disposed in the part, the other terminal of the winding is disposed in the other opening of the core, and the terminal disposed in the one opening of the core is the main A terminal connected to a circuit and disposed at the other of the openings of the core is connected such that the windings are electrically connected in series. The transformer according to any one of claims 1 to 4.
The primary winding includes a bobbin, a winding wound around the bobbin, and a terminal of the winding, and the terminal of the winding is fixed to a terminal portion of the bobbin by a fastening member. The secondary winding is connected to a primary circuit of the main circuit, while the secondary winding includes a bobbin, a winding divided into a plurality of pieces and wound around the bobbin, and respective terminals of the winding. The respective terminals of the winding are fixed to the terminal portion of the bobbin by a fastening member via a connection plate, whereby the respective terminals of the winding are electrically connected and the other of the windings A transformer characterized in that each terminal of the wire is connected to a secondary circuit of the main circuit by being fixed to a terminal portion of the bobbin by a fastening member. In the transformer according to claim 5,
A heat dissipating material for dissipating heat to one side of the core is disposed between each terminal of a plurality of divided and wound windings around the bobbin of the secondary winding and the bobbin of the secondary winding. Transformers characterized by being. In the transformer according to claim 2,
The winding cover is formed in a concave shape so as to cover at least a circumferential surface of the plurality of windings of the secondary winding, and the plurality of windings of the secondary winding are formed in the concave portion of the winding cover. A transformer characterized in that is arranged. In the transformer according to claim 7,
The winding cover is an air path through which cooling air flows on the side where the terminal portion connected to the main circuit is located and in the portion located at the opening of the end of the core having a U-shaped cross section A transformer characterized in that a notch is formed. A pair of cores having a U-shaped cross section, a primary winding and a secondary winding disposed in the pair of cores, and a winding cover covering a periphery of the secondary winding;
The secondary winding includes two bobbins, two windings wound around each of the two bobbins, a flat winding disposed between the two windings, and the two windings. A heat dissipation member disposed in a space formed in each of the bobbins, a terminal of one of the two windings, and a terminal of the other winding of the two windings; A terminal of the flat winding, a connection plate for connecting a terminal of the other winding of the two windings, a terminal of the one winding and a terminal of the flat winding; A connection plate for connecting the terminal of the other of the two windings to the terminal of the flat winding and the terminal of the other winding, and the terminals of the flat winding are insulated It consists of a heat sink connected via a plate,
The terminal of one of the two windings and the terminal of the other of the two windings are fixed to the terminal portion of one of the bobbins and connected to the secondary circuit of the main circuit, and one of the windings The terminal of the wire, the terminal of the flat winding, and the terminal of the other winding are such that one of the winding, the flat winding and the other winding are electrically connected in series. A transformer characterized in that it is connected. In the transformer according to claim 9,
A transformer characterized in that a litz wire is used for the two windings. A pair of cores having a U-shaped cross section, and a primary winding and a secondary winding disposed in the pair of cores;
The primary winding includes a fourth bobbin having first, second, third and second terminal portions, a first winding wound around the second bobbin, and the third bobbin. A second winding wound around the second winding, a terminal having two each in each of the first and second windings, and a winding around the first bobbin and the second bobbin A first heat radiating plate disposed between the first windings, a first winding wound around the second bobbin, and a third winding wound around the third bobbin A second heat dissipation plate disposed between the two windings, and a third heat dissipation disposed between the second winding wound around the third bobbin and the fourth bobbin It is fixed to the plate, the terminal of the first winding, the terminal of the second winding, and the one terminal portion of the fourth bobbin together with the first, second and third heat sinks. Second It consists of a heat sink,
One terminal of the first and second windings is fixed to one terminal portion of the fourth bobbin and is connected to a primary circuit of a main circuit, and one terminal of the first winding. And one terminal of the second winding is fixed to the other terminal portion of the fourth bobbin, and the first winding and the second winding are electrically connected in series; Transformer characterized in that it is connected. In the transformer according to claim 11,
A space is formed in each of the second and fourth bobbins, and a heat dissipation member is disposed in the space. In the transformer according to claim 12,
The first, second, and third heat dissipation plates are in contact with the heat dissipation member, the first heat dissipation plate is between the first bobbin and the second bobbin, and the second heat dissipation plate is The transformer characterized in that the second heat dissipation plate is disposed between the second bobbin and the third bobbin, and the third heat sink is disposed between the third bobbin and the fourth bobbin. In the transformer according to claim 13,
A transformer, wherein the first, second and third heat sinks are divided into a plurality of pieces in a circumferential direction.

Images