JP2000252136A - Trance - Google Patents

Abstract

(57) Abstract: An object of the present invention is to provide a transformer that can be easily manufactured with a small number of man-hours and that the insulation of a secondary winding can be sufficiently ensured. SOLUTION: A winding part is formed in a hollow cylindrical shape and is defined by flange parts 11a, 11b at both ends, and a plurality of winding coils 12, 1 are provided in the winding part.
A bobbin 12 in which layers 3 and 14 are wound in layers, and a core 15 inserted into the hollow portion of the bobbin. The transformer is configured and electrically connected by being wound around a secondary terminal 11d protruding from the outer surface of the flange portion 11b on one side of the winding portion of the bobbin. 10, a secondary terminal 11d protruding from a flange portion on one side of the winding portion of the bobbin is disposed at a sufficient distance from the primary windings 12 and 14 wound around the winding portion. The transformer 10 is configured as described above.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transformer having a plurality of coils used as, for example, a switching transformer.

[0002]

2. Description of the Related Art Conventionally, such a transformer is configured, for example, as shown in FIG. In FIG. 4, a transformer 1 is a so-called layered switching transformer, and a hollow cylindrical bobbin 2 having upper and lower flange portions 2a and 2b, and a winding defined between two flanges of the bobbin 2. It comprises a primary winding 3, a secondary winding 4, and a primary winding 5 sequentially laminated and wound on a wire portion, and a core 6 disposed in a hollow portion of the bobbin 2. .

The primary winding 3, secondary winding 4 and primary winding 5 are wound around the winding portion of the bobbin 2 as follows. That is, first, after the primary winding 3 is wound on the cylindrical surface of the winding portion of the bobbin 2, a secondary winding 4 composed of a so-called three-layer insulated wire is wound thereon, and the Primary winding 5 on top
Is wound similarly. The winding terminals of the primary windings 3 and 5 are connected to a primary terminal 2c provided at a lower portion of the bobbin 2 by soldering or the like. After the insulating coating is removed, the winding terminal of the secondary winding 4 is peeled off and connected to a secondary terminal 2d provided at the lower part of the bobbin 2 by soldering or the like.

According to the transformer 1 configured as described above, the drive current flows through the primary windings 3 and 5 to generate an induced current in the secondary winding 4, and this induced current is applied to the secondary terminal 2.
d to the outside.

[0005]

The transformer 1 having such a configuration has the following problems. That is, since the secondary winding 4 itself composed of the three-layer insulated wire is insulated and coated, it is securely insulated from the primary windings 3 and 5; Therefore, a so-called live part is exposed at a soldered portion for the secondary terminal 2d, and this soldered portion is arranged close to the primary windings 3, 5 via the flange 2b. Therefore, sufficient insulation cannot be ensured.

[0006] By the way, depending on safety standards, the primary-secondary withstand voltage of the switching transformer is required to be 4 kV for 250 V input and 3 kV for Europe, for example, in the Electrical Appliance and Material Control Law. Therefore, in the transformer 1 having the above-described configuration, the insulation tape is applied to the winding terminals of the secondary winding 4 and the flanges 2b of the primary windings 3 and 5. However, ensuring insulation with such an insulation tape requires a process of attaching the insulation tape, and the insulation reliability of the insulation tape is low. Also, depending on the state of attachment of the insulation tape, the insulation is insufficient. And other problems.

On the other hand, as shown in FIG. 5, a winding terminal 4a of a secondary winding 4 made of a three-layer insulated wire is connected to a secondary terminal 2d.
There is also known a configuration in which the transformer 1 is directly exposed and soldered to a predetermined conductive pattern on a printed circuit board 7 on which the transformer 1 is mounted. In such a configuration, the winding terminal 4a of the secondary winding 4 has a sufficient spatial distance between the primary windings 3 and 5, so that sufficient insulation can be ensured. Become.

However, in the transformer 1 having such a configuration, the winding terminal 4a of the secondary winding 4 is connected to the secondary terminal 2a.
d, so that it is soldered on the printed circuit board 7 via so-called aerial wiring,
There is a problem in reliability regarding fixing to the printed circuit board 7 by soldering, and it is necessary to prevent the winding terminal 4a from coming into contact with the primary side when the solder is melted or the soldered portion is detached. In addition, there has been a problem that noise is mixed due to aerial wiring. In addition, when the transformer 1 alone moves, the winding terminal 4a of the secondary winding 4 may be touched by something and may be deformed, so that care must be taken in transporting and assembling the transformer. Furthermore, since the winding terminal 4a of the secondary winding 4 is not connected to the secondary terminal 2d during the product inspection of the transformer 1, a separate connection work is required for the winding terminal 4a. However, there is a problem that the inspection time becomes longer.

In view of the above, it is an object of the present invention to provide a transformer that can be easily manufactured with a small number of man-hours and that the insulation of the secondary winding can be sufficiently ensured.

[0010]

SUMMARY OF THE INVENTION According to the present invention, there is provided, in accordance with the present invention, a winding having a hollow cylindrical shape and defined by flange portions at both ends. A bobbin in which a plurality of winding coils are wound in layers, and a core inserted into the hollow portion of the bobbin, and among the winding coils, the secondary winding is formed from a three-layer insulated wire. And a transformer whose winding end is electrically connected to a secondary terminal protruding from an outer surface of a flange portion on one side of the winding portion of the bobbin. The secondary terminal protruding from the flange portion on one side of the winding portion of the bobbin is arranged at a sufficient distance from the primary winding wound on the winding portion,
Achieved by a transformer.

In the transformer according to the present invention, preferably, the one side flange portion is formed to be thick.

In the transformer according to the present invention, the one side flange portion is preferably selected to have a thickness of 6 mm or more.

[0013] In the transformer according to the present invention, preferably, the one side flange portion has an overhang portion, and the overhang portion has a secondary terminal.

According to the above construction, the secondary terminal to which the winding terminal of the secondary winding composed of the three-layer insulated wire is cut off and electrically connected is separated from the primary winding by a sufficient spatial distance. Therefore, sufficient insulation for the primary winding can be ensured. Therefore, the withstand voltage between the primary winding and the secondary winding can be set sufficiently high, and in order to secure insulation, it is not necessary to attach an insulating tape. Cost can be reduced. In addition, since the winding terminal of the secondary winding is not directly exposed but is wrapped around the secondary terminal provided on the bobbin and is electrically connected, the inspection, transportation and assembly of the transformer can be easily performed. As a result, the influence of noise as in the case of aerial wiring can be eliminated.

[0015] When the one side flange portion is formed to be thick, for example, 6 mm or more in thickness, the secondary terminal from which the winding terminal of the secondary winding is wound is connected to the flange portion. The primary winding is separated from the primary winding by a sufficient spatial distance in the thickness direction, and sufficient insulation of the primary winding can be ensured.

In the case where the one side flange portion has an overhang portion, and the overhang portion has a secondary terminal, the secondary terminal from which the winding terminal of the secondary winding is wrapped is provided. ,
In the direction perpendicular to the thickness direction of the flange portion, the primary winding is separated from the primary winding by a sufficient spatial distance, and sufficient insulation of the primary winding can be secured.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings. FIG. 1 shows a first embodiment of a transformer according to the present invention. In FIG. 1, a transformer 10 is a so-called layered switching transformer, and has a hollow cylindrical bobbin 11 having upper and lower flange portions 11a and 11b, and a winding defined between two flanges of the bobbin 11. A primary winding 12, a secondary winding 13, and a primary winding 14 that are sequentially stacked and wound on the wire portion;
And a core 15 disposed in the hollow portion of the bobbin 11.

The primary winding 12, the secondary winding 13 and the primary winding 14 are wound around the winding part of the bobbin 11 as follows. That is, first, after the primary winding 12 is wound on the cylindrical surface of the winding part of the bobbin 11, a secondary winding 13 composed of a so-called three-layer insulated wire is wound thereon, A primary winding 14 is likewise wound thereon. The winding terminals of the primary windings 12 and 14 are connected to a primary terminal 11 c provided on the lower right side of the bobbin 11.
It is tied and connected by soldering or the like. After the insulation coating is removed, the winding terminal of the secondary winding 13 is peeled off and connected to the secondary terminal 11d provided on the lower left side of the bobbin 11 by soldering or the like.

The above configuration is the same as the configuration of the conventional switching transformer 1 shown in FIG. 4, but the configuration of the switching transformer 10 according to the embodiment of the present invention is different in the following points. That is, in the switching transformer 10, the flange portion 11 b below the bobbin 11 is formed to be thick (for example, 6 mm or more) in the vertical direction in the drawing, and the secondary winding 13 is formed. Is provided with a projection 16 for pulling out.

The transformer 10 according to the embodiment of the present invention is configured as described above, and allows a drive current to flow from the primary terminal 11c to the primary windings 12 and 14 wound around the winding portion of the bobbin 11. As a result, an induced current is generated in the secondary winding 13, and the induced current is extracted from the secondary terminal 11d to the outside.

In this case, the secondary winding 13 penetrates below the flange 11b through an extraction hole 11f provided in the flange 11b of the bobbin 11, and further projects
Is drawn out to the vicinity of the secondary terminal 11d, is wrapped around the secondary terminal 11d, and is connected by soldering or the like. Thereby, the secondary terminal 1 of the winding terminal of the secondary winding 13 is
Since the soldered portion to 1d is separated from the primary winding 12 by the thickness of the flange portion 11b, sufficient insulation of the primary winding 12 can be ensured. Here, the secondary terminal 11d of the winding terminal of the secondary winding 13
The amount of solder used for soldering to the secondary terminal 11 is appropriately selected so as to flow only around the secondary terminal 11d.
Soldering is performed. Incidentally, the assembling work of the transformer 10 is the same as that of the conventional transformer 1 shown in FIG. 4, so that the assembling cost does not increase.

FIG. 2 shows a second embodiment of the transformer according to the present invention. In FIG. 2, the transformer 20 is
The configuration is almost the same as that of the transformer 10 shown in FIG.
The configuration is different only in that the secondary terminal 11d is provided in an overhang portion 11e extending laterally from the flange portion 11b of the bobbin 11. In this case, the secondary winding 13
As shown in FIG. 2, the winding terminal of FIG. 2 penetrates above the flange 11 a through an extraction hole 11 g provided in the flange 11 a above the bobbin 11, and
It is routed from the upper side of a to the vicinity of the secondary terminal 11d, wrapped around the secondary terminal 11d, and soldered. According to the transformer 20 having such a configuration, the winding terminal of the secondary winding 13 is routed from the upper side of the upper flange portion 11a to the overhang portion 11e of the lower flange portion 11b, and is connected to the secondary terminal 11d. Since they are connected, they are separated from the primary winding 12 by the overhang length of the overhang portion 11e, and sufficient insulation of the primary winding 12 can be ensured.

In the above-described transformer 20, the winding terminal of the secondary winding 13 is not routed above the upper flange 11a but directly to the lower flange 11b, as shown in FIG. May be wound around the overhang portion 11e, wrapped around the secondary terminal 11d, and soldered.

In the above embodiment, the switching transformers 10 and 20 have been described.
It is clear that the present invention can be applied to transformers having other configurations.

[0025]

As described above, according to the present invention, the secondary terminal, which is formed by winding the winding terminal of the secondary winding composed of the three-layer insulated wire and electrically connected thereto, is connected to the primary winding from the primary winding. Since they are separated from each other by a sufficient space distance, sufficient insulation for the primary winding can be ensured. Therefore, the withstand voltage between the primary winding and the secondary winding can be set sufficiently high, and in order to secure insulation, it is not necessary to attach an insulating tape. Cost can be reduced. In addition, since the winding terminal of the secondary winding is not directly exposed but is wrapped around the secondary terminal provided on the bobbin and is electrically connected, the inspection, transportation and assembly of the transformer can be easily performed. As a result, the influence of noise as in the case of aerial wiring can be eliminated.

When the one side flange portion is formed to be thick, for example, 6 mm or more in thickness, the secondary terminal from which the winding terminal of the secondary winding is wound is connected to the flange portion. The primary winding is separated from the primary winding by a sufficient spatial distance in the thickness direction, and sufficient insulation of the primary winding can be ensured.

In the case where the one side flange portion has an overhang portion and has a secondary terminal at the overhang portion, the secondary terminal from which the winding terminal of the secondary winding is wound is provided. ,
In the direction perpendicular to the thickness direction of the flange portion, the primary winding is separated from the primary winding by a sufficient spatial distance, and sufficient insulation of the primary winding can be secured.

Thus, according to the present invention, it is possible to provide an extremely excellent transformer which can be easily manufactured with a small number of man-hours and in which the insulation of the secondary winding can be sufficiently ensured.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing a first embodiment of a switching transformer according to the present invention.

FIG. 2 is a schematic sectional view showing a second embodiment of the switching transformer according to the present invention.

FIG. 3 is a schematic perspective view of the switching transformer of FIG. 2;

FIG. 4 is a schematic cross-sectional view illustrating a configuration of an example of a conventional switching transformer.

FIG. 5 is a cross-sectional view illustrating the configuration of another example of a conventional switching transformer.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Transformer 11 Bobbin 11a, 11b Flange part 11c Primary terminal 11d Secondary terminal 11e Projection part 12,14 Primary winding 13 Secondary winding 15 Core 16 Projection

Claims (4)

[Claims] 1. A bobbin having a hollow cylindrical shape and a winding portion defined by flange portions at both ends, on which a plurality of winding coils are wound in layers. And a core inserted into the hollow portion of the bobbin, wherein the secondary winding of the winding coil is formed of a three-layer insulated wire, and the winding terminal of the bobbin is It is electrically connected by being wrapped around the secondary terminal projecting from the outer surface of the flange part on one side of the winding part,
A transformer, wherein a secondary terminal protruding from a flange portion on one side of the winding portion of the bobbin is arranged at a sufficient distance from a primary winding wound around the winding portion. And a transformer. 2. The transformer according to claim 1, wherein the one side flange portion is formed to be thick. 3. The transformer according to claim 2, wherein the one side flange portion is selected to have a thickness of 6 mm or more. 4. The transformer according to claim 1, wherein the one side flange portion has an overhang portion, and the overhang portion has a secondary terminal.