JP2538050B2 - Trance - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a winding part of a transformer, and more particularly to a winding part having a split structure.

2. Description of the Related Art Conventionally, this type of transformer has a structure as shown in FIGS. That is, in FIG. 2, 1 is a ferrite core forming a closed magnetic circuit, and 2 is a resin bobbin. The bobbin 2 is wound with a primary winding 3, a secondary winding 4 and a tertiary winding 5 which are divided into three. The secondary winding 4 has a winding withstand voltage in each of the divided grooves 6, 7 and 8, and is arranged in a multi-layer winding so as to have a small space.

The winding start of the winding wound on the first dividing groove 6 is
As shown in FIGS. 6 and 7, it is drawn into the bottom surface of the groove through a gap 10 provided on the wall surface 9 of the groove. The winding start of the winding wound on the second dividing groove 7 is drawn into the bottom surface of the groove through a gap 12 provided in the wall surface 11 of the groove as shown in FIGS. 8 and 9.

However, it is difficult for the winding of the first dividing groove 6 to be aligned and wound in the structure as described above. In other words, as shown in FIG. 7, the winding has a structure in which it bends sharply at the beginning of the winding, but if too much tension is applied more than necessary, the wire deteriorates and the winding cannot be bent suddenly. 13
Occurs. For this reason, there is a problem that the windings fall into this gap when the layers are aligned and wound in a multi-layered manner so as to be overlapped on the windings and winding disorder occurs, resulting in poor reliability of withstand voltage.

Further, since the winding start portion 14 of the secondary winding 4 is located at the bottom of the groove 15 of the windings of the primary winding 3 and the secondary winding 4, there is a problem that connection work with the winding is difficult.

Therefore, the present invention facilitates alignment and multilayer winding without suddenly bending the wire at the winding start portion of the divided winding,
The first purpose is to obtain a highly reliable transformer.

The second purpose is to facilitate the connection of the ends of the winding and to obtain a transformer with good workability in manufacturing.

Means for Solving the Problems In order to achieve the above-mentioned first object, the present invention is characterized in that the end of the winding wound in the split groove of the winding start of the secondary winding is 2
The height of the bottom surface of the split groove is changed so that the end of the winding wound in the next split groove of the next winding and the center of the magnetic path are substantially at the same height.

In order to achieve the second object, according to the present invention, the number of windings wound in the split groove at the start of winding of the secondary winding is 1 turn or less, and a terminal is provided on the centrifugal side of the split groove at the start of winding. The winding start of the secondary winding is connected to the terminal and mounted on the printed board.

With the above configuration, the transformer of the present invention is such that when the winding crosses from the split groove at the beginning of the secondary winding to the next split groove, the winding is gradually drawn into the groove from the higher position of the split groove toward the bottom. Therefore, it is not necessary to bend the winding abruptly, and the winding of the winding can be facilitated.

In addition, a terminal is provided on the split groove at the beginning of the secondary winding, and the secondary winding is connected to the terminal and mounted on the printed circuit board, so the work of connecting the end of the secondary winding is easy. Is what you can do.

Embodiment An embodiment of the present invention will be described below with reference to the accompanying drawings.

In FIG. 1, reference numeral 16 is a ferrite core forming a closed magnetic circuit, and 17 is a resin bobbin. A primary winding 18 is wound around the bobbin 17. The secondary winding 19 is divided and wound into divided grooves 20, 21, 22, and 23 provided perpendicularly to the magnetic path.
It is aligned and multi-layered wound on 22,23 respectively. This ensures the insulation withstand voltage of the winding and reduces the distributed capacitance between the wires, thereby reducing the winding loss. In the split groove at the beginning of winding, as shown in FIG. Bobbin 17 for each split groove
Are connected in series through the gaps 25, 26, 27 provided on the wall surface of the groove constituted by. As shown in FIG. 2, the bottom surface of the split groove 20 at the start of winding is high at the end of winding so that the position of the line at the end of winding in each groove is approximately the same distance 1 vertically from the center of the magnetic path. Has become.

With the above-mentioned structure, the portion where the winding wire extends from one division groove to the next division groove is gradually extended as shown in FIGS. 3 and 4.

As a result, since an unreasonable bending force is not applied to the winding, the position of the winding is stabilized and the reliability of aligned winding is improved. Further, since the structure of the portion across the dividing groove is the same, the stability in winding work is improved.

Also, as shown in FIGS. 1 and 2, the first dividing groove 20
Is provided with a groove only in about one half in the winding direction, and a terminal 24 is provided in a portion without the groove. The winding is wound around the terminal 24, the winding is made for one turn or less, and the winding is performed over the next division groove. Since the terminal 24 is thus provided outside the groove, the insulation distance from the winding is secured and the workability of the automatic machine is improved. Further, the terminal 24 is configured to be mounted on the printed board 28 and can be assembled at low cost.

EFFECTS OF THE INVENTION As described above, according to the present invention, the winding end position is set so as to gradually change the crossover portion between the divided windings of the transformer. it can. Therefore, it is possible to realize a transformer having a high withstand voltage.

Further, in the present invention, the winding start terminal portion is provided on the first split groove, and the first split groove is one turn or less. Since it is performed after the second dividing groove, it is possible to eliminate the disorder of the aligned winding that occurs at the beginning of winding of the winding. Therefore, a transformer with good workability in manufacturing can be realized and reliability can be improved.

[Brief description of drawings]

1 is a sectional view of an embodiment of the transformer of the present invention, FIG. 2 is a view taken in the direction of arrow C in FIG. 1, FIG. 3 is a view taken in the direction of arrow C ′ in FIG. 1, and FIG. FIG. 5 is a sectional view of a conventional transformer, FIG. 6 is a view taken in the direction of arrow A in FIG. 5, FIG. 7 is a view taken in the direction of arrow A ′ of FIG. 5, and FIG. Figure B view, Figure 9 B '
It is an arrow view. 16 …… Core, 17 …… Bobbin, 18 …… Primary winding, 2 …… 2
Next winding, 20 to 23 ...... Dividing groove, 24 ...... Terminal, 28 ...... Printed board.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Haruo Suenaga Inventor Haruo, Kadoma 1006, Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Mitsuo Ebisawa, 1006, Kadoma, Kadoma, Osaka Of (56) References Actually opened 62-98221 (JP, U) Actually opened 57-31812 (JP, U)

Claims (2)

(57) [Claims] 1. A core forming a closed magnetic circuit, a primary winding, and 2
A secondary winding and a bobbin around which the primary winding is wound,
The bobbin forms a plurality of grooves perpendicular to the magnetic path formed by the core, the secondary winding is divided into the grooves and wound, and each divided winding is a gap provided on the wall surface of the groove. Windings connected in series through the second winding, and a portion of the winding wound on the second split groove of the secondary winding that starts to reach the second split groove of the secondary winding. And the height of the bottom surface of the dividing groove is changed so that the height becomes substantially the same vertically from the center of the magnetic path. 2. A core forming a closed magnetic circuit, a primary winding, and 2
A secondary winding and a bobbin around which the primary winding and the secondary winding are wound are provided, the bobbin forming a plurality of grooves perpendicular to a magnetic path formed by the core, and the secondary winding being the aforesaid. The winding is divided into grooves, each of the divided windings is connected in series through a gap provided in the wall surface of the groove, and the number of windings wound in the division groove at the beginning of winding of the secondary winding is 1 A transformer in which the number of turns is less than or equal to a turn, a terminal is provided on the split groove at the beginning of winding, and the beginning of the secondary winding is connected to the terminal.