JP6418758B2 - Trance - Google Patents

Description

  The present invention relates to a transformer used for a switching power supply and the like, and more particularly to a structure of a transformer having a leakage inductance.

  The transformer is preferably miniaturized, but on the other hand, it is necessary to satisfy the insulation performance characteristics that have a trade-off relationship with the miniaturization. For example, the insulation performance between the windings must satisfy a predetermined condition.

  In general, in order to satisfy the above insulation performance, the insulation performance of the electric wire used, the spatial distance between windings, or the insulation distance (creeping distance) are parameters. Therefore, when ordinary enameled wires are used as the wires, the insulation performance of the enamel itself is not sufficiently high, so between the primary and secondary windings and the bobbin collar (buttock) In order to increase the insulation distance (creeping distance), an insulating layer made of insulating paper or barrier tape is provided (for example, see Patent Documents 1 and 2). FIG. 1 shows a cross-sectional configuration of the upper half of a conventional transformer example.

  The transformer 1 includes collars 10 and 11 (saddle parts) at both ends of a bobbin in which a core 14 is inserted into a hollow cylindrical part 13 inside the winding frame part 12, and the winding frame part of the hollow cylindrical part between the collars 10 and 11. 12, a primary winding and a secondary winding are sequentially wound. A ferrite core 14 is disposed in the hollow cylindrical portion 13 of the winding frame portion 12 (downward in the drawing), and connecting pins (not shown) are provided outside the collars 10 and 11.

  In the transformer 1 of FIG. 1, the first primary winding 20 has a single layer structure of 7 to 8 turns and the flat plate-like first secondary winding 21 has three layers in the vertical direction on the winding frame portion 12 in order from the bottom. The structure is wound around 3 turns. In addition, an insulating paper 30 indicated by a black solid line is disposed between the windings up to the vicinity of the end portions of the collars 10 and 11, and the creeping distance Z of each winding is ensured to achieve interlayer insulation.

  In Patent Documents 1 and 2 showing the structure of this type of transformer, primary windings and secondary windings are alternately arranged in the horizontal direction with respect to the core, or the distance in the vertical direction is adjusted, so that An active use of leakage inductance is disclosed.

JP 7-283038 A JP-A-2005-277088

  However, in the transformer structure as shown in Patent Documents 1 and 2, since the primary winding and the secondary winding are alternately arranged, the horizontal width of the bobbin becomes large. If each winding is wound to the full width of the bobbin, the number of turns of the primary winding cannot be increased when a request to change the number of turns of one of the windings, for example, the primary winding occurs. Therefore, when increasing the number of turns of the primary winding, it is necessary to extend the shape of the bobbin to the left and right by the length of the primary winding to the left and right. As a result, there is a disadvantage that the transformer shape becomes large. For example, when it is desired to increase the creepage distance between the secondary winding and the secondary winding, the barrier tapes and spacers are arranged right next to the winding in the structures of Patent Documents 1 and 2, so that the horizontal insulation There was an inconvenience that I couldn't get away.

  An object of the present invention is to provide a transformer that ensures a predetermined insulation performance without increasing the bobbin shape even when the number of primary windings is increased.

The structure of the present invention will be described with reference to FIG. 2. A first winding portion and a second winding portion are arranged in this order on a bobbin winding frame portion in which a core is inserted into a hollow cylindrical portion and collars are provided at both ends. In a transformer having a wound first winding structure,
The first winding portion is
An n layer portion (20b) wound from one end of the collar of the collar at both ends of the bobbin to the other end of the collar, and an α layer portion (20a) wound only in the vicinity of the end of the collar. A first primary winding (20) consisting of
The second winding part is
The consists of a first secondary winding wound across the winding on the n layer of the first primary winding in a shorter width than the distance between the color of the bobbin (21),
The α layer portion (20a) of the first primary winding (20) is sandwiched between the winding start portion (21L) of the first secondary winding (21) and the collar. The first primary winding (20) wound is constituted by a heavy insulated wire having a plurality of layers insulated around a copper wire ,
The first secondary winding (21) is a flat plate-like winding, and is wound through insulating paper (30) extending to the vicinity of the collar end portion for each layer. .

  Since the first primary winding (20) is composed of a heavy insulated wire in which a plurality of layers are insulated around the copper wire, the diameter of the first primary winding (20) is usually large, but the insulation performance is ensured. It is not necessary to provide a horizontal distance between the winding (20) and the collar and to increase the creepage distance between the first primary winding (20) and the first secondary winding (21). Further, the α layer portion (20a) of the first primary winding is disposed in a space formed between the collars 10, 11 and the first secondary winding on the n layer portion of the first primary winding. In addition, the number of turns of the first primary winding (20) as a whole can be reduced by further winding the α layer portion (20a) of the first primary winding arranged in this space in the vertical direction. You can do more.

Further, the positions of the left and right end winding portions of the n-layer portion (20b) of the first primary winding (20) are determined by the collars 10 and 11, and the first secondary winding (21) is the first primary winding (21). The left and right positions are fixed by the α layer portion (20a) of the winding (20). For this reason, the shift | offset | difference and disconnection of a coil | winding can be prevented.
Furthermore, with such a structure, the α layer portion (20a) of the first secondary winding (21) is the same as the n layer portion (20b) of the first primary winding and the insulating paper (30). Since the positioning is performed by being sandwiched between them, the winding can be further prevented from being displaced or detached.

  In addition, the winding portion in the vicinity of the collar end portion where the n layer portion (20b) and the α layer portion (20a) of the first primary winding (20) are wound in the vertical direction is the first secondary winding. Since part of the magnetic flux generated in this portion of the first primary winding (20) does not interlink with the first secondary winding (21) because it is not opposed to the winding (21), the leakage magnetic flux It becomes. For this reason, even if it does not provide the space part which magnetic flux bypasses, a leakage magnetic flux can be enlarged.

In another embodiment of the present invention, referring to FIG. 3, a second winding portion and a first winding portion are provided on a bobbin winding portion having a core inserted in a hollow cylindrical portion and collars at both ends. In the transformer having the second winding structure wound in this order,
The second winding part is
The consists of a second secondary winding wound around a shorter width than the distance between the said collar between the collar at both ends of the bobbin (23),
The first winding portion is
In the second secondary winding (23) on the said one of the n layer portion from the collar end portion is wound over the other of the collar end portion of the collar at both ends of the bobbin and (24b), the It is composed of a second primary winding (24) composed of an α layer portion (24a) wound only near the end of the collar,
The α layer portion (24a) of the second primary winding (24) is sandwiched between the winding end portion (23U) of the second secondary winding (23) and the collar. The second primary winding (24) wound is constituted by a heavy insulated wire having a plurality of layers insulated around a copper wire ,
The second secondary winding (23) is a flat plate-like winding, and is wound around each layer through insulating paper (30) extending to the vicinity of the collar end. .

Also in the first winding portion, the second primary winding (24) is composed of a heavy insulated wire in which a plurality of layers are insulated around the copper wire. It is no longer necessary to provide a horizontal distance between the first primary winding (24) and increase the creepage distance between the second primary winding (24) and increase the number of turns of the second primary winding (24) as a whole. Further, the positions of the left and right end winding portions of the n layer portion (24b) of the second primary winding (24) are determined by the collars 10 and 11, and the second secondary winding (23) is the second primary winding (23). The left and right positions are fixed by the α layer portion (24a) of the winding (24). For this reason, the shift | offset | difference and disconnection of a coil | winding can be prevented. Furthermore, since the α layer portion (24a) of the second primary winding (24) is sandwiched and positioned between the n layer portion (24b) of the first primary winding and the insulating paper (30), the winding Line deviation and disconnection can be further prevented. Further, the upper second primary winding is formed in a space formed between the collars 10 and 11 and the second secondary winding (23) under the n layer portion (24b) of the second primary winding (24). The winding portion in the vicinity of the collar end portion where the α layer portion (24a) and the n layer portion (24b) of the line (24) are wound in the vertical direction is opposed to the second secondary winding (23). For this reason, a part of the magnetic flux generated in this portion of the second primary winding (24) does not interlink with the second secondary winding (23), and becomes a leakage magnetic flux. For this reason, even if it does not provide the space part which magnetic flux bypasses, a leakage magnetic flux can be enlarged.

  As still another embodiment of the present invention, as shown in FIG. 5, it is possible to use both the first winding structure shown in FIG. 2 and the second winding structure shown in FIG. . That is, the second winding structure is wound on the first winding structure. Further, when another winding is wound on the secondary winding, the third winding structure including the third secondary winding (22) is used as the first winding structure and the first winding structure. It is also possible to wind between two winding structures.

  As still another embodiment of the present invention, the first secondary winding (21) is wound through insulating paper (30) extending to the vicinity of the collar end for each layer, and the second secondary winding (21) is wound. The next winding (23) is wound through insulating paper (30) extending to the vicinity of the end of the collar for each layer.

  With this structure, the α layer portion (20a) of the first secondary winding (21) is between the n layer portion (20b) of the first primary winding and the insulating paper (30). Since they are sandwiched and positioned, it is possible to further prevent the winding from shifting or coming off. The same applies to the α layer portion (24a) of the second primary winding (24).

  As an example of the arrangement of the first and second secondary windings, the collars at both ends of the bobbin are arranged at a distance from the collars, or they are moved toward the collar side at one end of the bobbin. Deploy.

  In the present invention, the α layer portion (20a) of the first primary winding or the α layer portion (24a) of the second primary winding is used as the first secondary winding (21) or the second secondary winding. Since the wire (23) is wound in the space formed between the collar and these first or second secondary windings when winding the wire (23), the number of primary windings can be increased without increasing the bobbin. In addition, since the primary winding is composed of a heavy insulated wire in which the periphery of the copper wire is insulated in a plurality of layers, a certain insulation performance can be secured without providing a creepage distance.

  Further, the positions of the left and right end winding portions of the n layer portions (20b) and (24b) are determined by the collars 10 and 11, and the first secondary winding (21) is the first primary winding (20). The left and right positions are fixed to each other by the α layer portion (20a). For this reason, the shift | offset | difference and disconnection of a winding can be prevented.

  The first secondary winding (21) is wound through an insulating paper (30) extending to the vicinity of the end of the collar for each layer, whereby the first secondary winding (21 The α layer portion (20a) is positioned between the n layer portion (20b) of the first primary winding and the insulating paper (30), thereby further preventing the winding from shifting and coming off. it can. The same applies to the α layer portion (24a) of the second primary winding (24).

  Further, since a part of the magnetic flux generated in the parts (20a) and (24a) of the primary winding does not cross the secondary windings (21) and (23), a leakage magnetic flux is generated in this part. As a result, the leakage transformer can be configured without special measures.

Partial cross-sectional configuration diagram of a conventional transformer The partial cross section block diagram of the leakage transformer which is 1st Embodiment of this invention The partial cross section block diagram of the leakage transformer which is 2nd Embodiment of this invention Winding cross section The partial cross section block diagram of the leakage transformer which is 3rd Embodiment of this invention It is a partial section lineblock diagram of a leakage transformer of a 4th embodiment of this invention. Winding diagram of the above transformer

  FIG. 2 is a partial cross-sectional configuration diagram of the leakage transformer according to the first embodiment of the present invention. The winding configuration is the same as the conventional configuration shown in FIG.

  The transformer 1 includes collars 10 and 11 (saddle parts) at both ends of a bobbin in which a core 14 is inserted into a hollow cylindrical part 13, and a first frame is formed on the winding frame part 12 of the hollow cylindrical part 13 between the collars 10 and 11. A primary winding 20 (first winding portion) and a first secondary winding 21 (second winding portion) are wound in this order. The size of the transformer 1 is the same as that of the conventional transformer of FIG. 1, and the dimensions of the bobbin and the winding frame portion 12 are also the same as those of the conventional transformer. Further, like the conventional transformer, connection pins (not shown) are provided outside the collars 10 and 11.

  The first primary winding 20 is arranged from end to end of the collars 10 and 11, and the first secondary winding 21 is wound around a central portion that is slightly separated from the collars 10 and 11. Yes. Therefore, the left and right end portions of the first primary winding 20 have end portions that do not face the first secondary winding 21, respectively. An insulating paper 30 (insulating layer) having a width substantially the same as the distance between the collars 10 and 11 is disposed between the layers of the first secondary winding 21, and the creeping surface between the layers of the first secondary winding 21. The distance Z is sufficiently secured. In this example, the first primary winding 20 is a linear winding, and the first secondary winding 21 is a flat winding.

  The end portion of the first primary winding 20 includes a first layer 20b (referred to as an n layer portion 20b as will be described later) wound around the innermost periphery of the winding frame portion 12, and an n layer portion 20b. It has a second layer 20a (also referred to as an α layer portion 20a as will be described later) wound further on the upper portion, and the α layer portion 20a is located on the left and right of the winding start layer 21L of the first secondary winding 21 Be placed.

  An example of a procedure for creating such a transformer where n is 1 and α is 1 is n layers that are the first layer of the first primary winding 20 from, for example, the collar 10 side of the winding frame portion 12. The portion 20b is wound for one turn, and the α layer portion 20a, which is the second layer, is wound thereon. Next, the n-layer portion 20b is wound again next to the n-layer portion 20b wound earlier, the α-layer portion 20a is wound around the upper portion, the n-layer portion 20b is continuously wound up to the side surface of the collar 11, and the α-layer portion at the end Wind 20a for 2 turns. Thereafter, the winding start layer 21L of the flat plate-like first secondary winding is wound on the n layer portion 20b on the n layer portion 20b between the α layer portions 20a formed on the left and right sides, and the insulating paper 30 is interposed between the layers. For example, the first secondary winding 21 is wound three turns while sandwiching.

  The positions of the left and right ends of the n layer portion 20b of the first primary winding 20 are determined by the collars 10 and 11, and the α layer portion 20a of the first primary winding is defined by the insulating paper 30 and the n layer portion 20b. The upper and lower positions are determined in the sandwiched state. The first secondary winding 21 is fixed to the left and right positions with the α layer portion 20a of the first primary winding. The first secondary winding 21 is formed of a flat plate, and the position is fixed by being firmly wound together with the insulating paper 30.

  In this way, the end portions of the left and right primary windings 20 are overlapped with the side surfaces of the first secondary winding 21 to form a plurality of layers (two layers in this example), thereby using the same size bobbin. Thus, the number of turns can be increased by 4 turns than before. The end portion of the first primary winding 20 is pressed from above by the insulating paper 30 to determine the position, thereby preventing the winding from shifting or coming off.

  Here, an example is shown in which the first primary winding 20 is composed of an n layer portion 20b wound from the end portion of the collar to the end portion and an α layer portion 20a wound around the end portion of the collar. Each of the n layer portion 20b and the α layer portion 20a can be composed of a plurality of layers. Similarly, the first secondary winding 21 can also be composed of m layers of three or more phases.

  Note that the first secondary winding 21, which is the second winding portion, is formed as a flat plate-like winding, so that it is easy to wind firmly while sandwiching the insulating paper 30.

  FIG. 3 is a partial cross-sectional configuration diagram of a leakage transformer according to a second embodiment of the present invention.

  In the configuration, the difference from FIG. 2 is that the upper and lower positions of the primary winding and the secondary winding are opposite, and the rest is the same.

  That is, the transformer 1 includes collars 10 and 11 (grooves) at both ends of a bobbin in which a core 14 is inserted into a hollow cylindrical part 13, and the winding frame part 12 of the hollow cylindrical part 13 between the collars 10 and 11 Two secondary windings 23 (second winding portion) and a second primary winding 24 (first winding portion) are wound in this order. The size of the transformer 1 is the same as that of the conventional transformer of FIG. 1, and the dimensions of the bobbin and the winding frame portion 12 are also the same as those of the conventional transformer. Further, like the conventional transformer, connection pins (not shown) are provided outside the collars 10 and 11.

  The second primary winding 24 is arranged from end to end of the collars 10 and 11, and the second secondary winding 23 is wound around a central portion that is slightly separated from the collars 10 and 11. Yes. Therefore, the left and right end portions of the second primary winding 24 have end portions that do not face the second secondary winding 23, respectively. An insulating paper 30 (insulating layer) having a width substantially the same as the distance between the collars 10 and 11 is disposed between the layers of the second secondary winding 23, and the creepage distance Z between the second secondary windings. Is sufficiently secured. In this example, the primary winding is constituted by a linear winding, and the secondary winding is constituted by a flat winding.

  The end portion of the second primary winding 24 includes a first layer 24b (referred to as an n-layer portion 24b as will be described later) wound around the outermost periphery of the winding frame portion 12, and the n-layer portion 24b. And a second layer 24a (also referred to as an α layer portion 24a as will be described later) wound further on the lower portion, and the α layer portion 24a is provided on the left and right sides of the winding end layer 21U of the second secondary winding 23. Be placed.

  An example of a procedure for producing such a transformer is as follows. A winding start layer of a flat plate-like second secondary winding 23 is wound around the winding frame portion 12, and the second secondary winding is sandwiched between the insulating paper 30 between the layers. Wind the winding 23 three turns. Next, the α layer portion 24a of the second primary winding 24 is wound for one turn from, for example, the collar 10 side of the winding frame portion 12, and the n layer portion 24b is wound thereon. Next, the α layer portion 24a is wound again next to the α layer portion 24a wound earlier, the n layer portion 24b is wound on the upper portion, and then the n layer portion 24b is continuously wound toward the collar 11 side, leaving two turns, Next, the α layer portion 24a of the second primary winding 24 is wound for one turn in the space formed between the winding end layer 23U of the second secondary winding 23 and the collar 11, and the n layer portion 24b is formed thereon by 1 turn. Turn around. Then, the last α layer portion 24a is wound for one turn between the previously wound α layer portion 24a and the collar 11, and the last n layer portion 24b is wound thereon for one turn.

  The positions of the left and right ends of the second primary winding 24 are determined by the collars 10 and 11, and the α layer portion 24a of the second primary winding is insulated by being sandwiched between the insulating paper 30 and the n layer portion 24b. Supported by paper 30 from below, the vertical position is determined. The second secondary winding 23 is fixed at the left and right positions by the α layer portion 24a of the second primary winding. The second secondary winding 23 is formed of a flat plate, and the position is fixed by being firmly wound together with the insulating paper 30.

  In this way, the end portions of the left and right primary windings 24 are overlapped with the side surfaces of the second secondary winding 23 to form a plurality of layers (two layers in this example), thereby using the same size bobbin. Thus, the number of turns can be increased by 4 turns than before. The position of the end portion of the second primary winding 24 is determined by the insulating paper 30 so that the winding can be prevented from shifting or coming off.

  As in the embodiment of FIG. 2, each of the n layer portion 24b and the α layer portion 24a can be composed of a plurality of layers. The first secondary winding 23 can also be composed of m layers of three or more phases.

  It should be noted that the second secondary winding 23, which is the second winding portion, can be easily wound firmly while sandwiching the insulating paper 30 by using a flat plate-like winding.

  FIG. 4 is a cross-sectional structure diagram of the first and second primary windings 20 and 24. Insulating coatings 30b to 30d are three-folded around the conductor 30a made of copper wire. Thus, since it is the structure of the heavy insulated wire which insulated the circumference | surroundings of the copper wire in multiple layers, the 1st, 2nd primary winding itself has sufficient insulation performance. As a result, even if an insulation distance is not formed between the first and second primary windings 20 and 24 and the first and second secondary windings 21 and 23 as shown in FIGS. The insulation performance is not degraded.

  FIG. 5 is a partial cross-sectional configuration diagram of a leakage transformer according to a third embodiment of the present invention.

  In the transformer of this embodiment, the first winding structure shown in FIG. 2 and the second winding structure shown in FIG. 3 are combined, and the third winding structure is a third winding structure between these winding structures. Secondary winding 22 is arranged.

  That is, the first winding structure shown in FIG. 2 is formed on the winding frame portion 12, the third secondary winding 22 is wound thereon, and the second winding shown in FIG. A line structure is formed. Each of the third secondary windings 22 is formed by winding up two turns. By configuring as shown in FIG. 5, the third secondary winding 22 is connected to the first and second secondary windings 22 and 23, respectively, to form a transformer having a winding diagram as shown in FIG. I can do it.

  Also in the transformer having the above structure, the first primary winding 20 and the second primary winding 24 are each wound 11 turns, which is several turns more than the conventional 7 to 8 turns. Further, since the insulation performance of the winding is remarkably improved, the insulation performance required for the transformer can be ensured without providing a creepage distance between the primary winding and the secondary winding.

  The positions of the left and right ends of the first and second primary windings 20 and 24 are determined by the collars 10 and 11, and the α layer portions 20a and 24a of the first and second primary windings 20 and 24 are The upper and lower positions are determined by the insulating paper 30. The left and right positions of the first and second secondary windings 21 and 23 are fixed to each other by the n layer portions 20a and 24a of the first and second primary windings. The first and second secondary windings 21 and 23 are formed of flat plates, and their positions are fixed by being firmly wound together with the insulating paper 30.

  Also in the transformer of the above embodiment, the left and right end portions in the vicinity of the collar end portions of the first and second primary windings 20 and 24 are overlapped with the side surfaces of the first and second secondary windings 21 and 23. By using a plurality of layers (in this example, two layers), the same number of bobbins can be used and the number of turns can be increased as compared with the conventional case. The end portions of the first and second primary windings 20 and 24 are positioned by the insulating paper 30 to prevent the windings from being displaced or detached, and the first and second secondary windings 21 and 23 can be prevented. The left and right positions are fixed to each other by the α layer portions 20a and 24a of the first primary winding.

  FIG. 6 is a partial sectional configuration diagram of a leakage transformer according to a fourth embodiment of the present invention.

  In this embodiment, the first secondary winding 21 and the second secondary winding 23 are moved to the collar 10 side, and the first secondary winding 21, the second secondary winding 23 and the collar 11 are moved. The α layer portions 20a and 24a of the first primary winding 20 and the second primary winding 24 are arranged on the left side in the space formed between the four primary windings 20 and 24a. Four primary windings 20 and four n-layer portions 20b and 24b of the second primary winding 24 are arranged on the α layer portions 20a and 24a of the primary windings. Therefore, in this embodiment, a part of the first primary winding 20 composed of the n-layer portion 20b and the α-layer portion 20a not facing the first and second secondary windings is four windings in the space. Four windings are arranged on the other part of the second primary winding 24 which is arranged and is not opposed to the first and second secondary windings and which is composed of the n layer portion 24b and the α layer portion 24a.

  Also in the transformer of the above embodiment, by overlapping one end portions of the primary windings 20 and 24 on the side surfaces of the first secondary windings 21 and 23 to form a plurality of layers (two layers in this example), Since the same number of bobbins can be used to increase the number of turns as compared with the prior art, the leakage transformer having the winding diagram shown in FIG. 7 can be configured. The end portions of the first primary windings 20 and 24 are positioned by the insulating paper 30 to prevent the windings from being displaced or detached, and the first secondary windings 21 and 23 are the first primary windings. The left and right positions are fixed to each other by the α layer portions 20a and 24a of the line.

  In FIGS. 5 and 6, the third secondary winding 22 is wound as a third layer winding structure between the first winding structure and the second winding structure. When the secondary winding 22 is not required, the second winding structure is disposed on the first winding structure.

1-transformer 10,11-color 20,24-primary winding 21-23-secondary winding 30-insulating paper X, Y-space

Claims (8)

In a transformer having a first winding structure in which a core is inserted into a hollow cylindrical portion and a first winding portion and a second winding portion are wound in this order on a bobbin winding frame portion provided with a collar on both ends.
The first winding portion is
It said one of the n layer portion wound over the other of the collar edge from the color end and (20b), the α layer portion wound only around collar edge of the collar at both ends of the bobbin ( 20a) comprising a first primary winding (20) consisting of
The second winding part is
The consists of a first secondary winding wound across the winding on the n layer of the first primary winding in a shorter width than the distance between the color of the bobbin (21),
The α layer portion (20a) of the first primary winding (20) is wound in a state of being sandwiched between the winding start portion of the first secondary winding (21) and the collar. The first primary winding (2 0 ) is composed of a heavy insulated wire having a plurality of layers insulated around a copper wire ,
The first secondary winding (21) is a flat plate-like winding, and is wound through insulating paper (30) extending to the vicinity of the collar end portion for each layer.
Transformer characterized by that. In a transformer having a second winding structure in which a core is inserted into a hollow cylindrical portion and a second winding portion and a first winding portion are wound in this order around a bobbin winding frame portion provided with a collar at both ends.
The second winding part is
The consists of a second secondary winding wound around a shorter width than the distance between the said collar between the collar at both ends of the bobbin (23),
The first winding portion is
In the second secondary winding (23) on the said one of the n layer portion from the collar end portion is wound over the other of the collar end portion of the collar at both ends of the bobbin and (24b), the It is composed of a second primary winding (24) composed of an α layer portion (24a) wound only in the vicinity of the end of the collar,
The α layer portion (24a) of the second primary winding (24) is wound in a state of being sandwiched between the winding end portion of the second secondary winding (23) and the collar. The second primary winding (24) is composed of a heavy insulated wire having a plurality of layers insulated around a copper wire ,
The second secondary winding (23) is a flat plate-like winding, and is wound through insulating paper (30) extending to the vicinity of the collar end for each layer.
Transformer characterized by that. In a transformer in which a first winding structure and a second winding structure are wound in this order on a bobbin winding frame portion having a core inserted into a hollow cylindrical portion and provided with collars at both ends.
The first winding structure includes a first winding portion and a second winding portion,
The first winding portion is
An n layer portion (20b) wound from one end of the collar of the collar at both ends of the bobbin to the other end of the collar, and an α layer portion (20a) wound only in the vicinity of the end of the collar. A first primary winding (20) consisting of
The second winding part is
The consists of a first secondary winding wound across the winding on the n layer of the first primary winding in a shorter width than the distance between the color of the bobbin (21),
The α layer portion (20a) of the first primary winding (20) is wound in a state of being sandwiched between the winding start portion of the first secondary winding (21) and the collar. The first primary winding (2 0 ) is composed of a heavy insulated wire having a plurality of layers insulated around a copper wire,
The second winding structure is composed of a third winding portion and a fourth winding portion,
The fourth winding part is
The consists of a second secondary winding wound around a shorter width than the distance between the said collar between the collar at both ends of the bobbin (23),
The third winding portion is
In the second secondary winding (23) on the said one of the n layer portion from the collar end portion is wound over the other of the collar end portion of the collar at both ends of the bobbin and (24b), the It is composed of a second primary winding (24) composed of an α layer portion (24a) wound only in the vicinity of the end of the collar,
The α layer portion (24a) of the second primary winding (24) is wound in a state of being sandwiched between the winding end portion of the second secondary winding (23) and the collar. The transformer is characterized in that the second primary winding (24) is constituted by a heavy insulated wire in which a plurality of layers are insulated around a copper wire.   4. The transformer according to claim 3, wherein a third winding structure comprising a third secondary winding (22) wound between the first winding structure and the second winding structure is disposed. The transformer according to claim 3 or 4 , wherein the first secondary winding (21) is wound through insulating paper (30) extending to the vicinity of the collar end portion for each layer. The transformer according to claim 3 or 4 , wherein the second secondary winding (23) is wound through insulating paper (30) extending to the vicinity of the collar end portion for each layer. The transformer according to claim 3 , wherein the first secondary winding (21) is a plate-like winding. The transformer according to any one of claims 3 , 4, and 6, wherein the second secondary winding (23) is a flat-plate winding.

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