JPS60192316A - Manufacture of transformer wiring - Google Patents

Abstract

PURPOSE:To adjust surface distance between the windings of the primary side and secondary side by improving the shape of bobbin body and forming a flange portion as the 2-division movable structure. CONSTITUTION:A bobbin 11 is slidable in the axial direction of a sleeve member 12 under the condition that the small diameter engaging portions of flange members 13a, 13b are engaged respectively with both ends of cylindrical sleeve member 12. First, under the narrow condition, the primary coil is wound for the specified turns on the sleeve member 12 (Fig. A). As shown in Fig. B, both flange members 13a, 13b are drawn in such a direction as separating each other as indicated by the arrow mark in order to obtain the wider condition. Thereafter, as shown in Fig. C, circumference of primary coil 15 is covered and fixed with an insulating material 16. Finally, as shown in Fig. D, a secondary coil 17 is wound for the required number of turns to the external circumference of insulating member 16. With such a structure, the surface distance between the primary coil 15 and secondary coil 17 can certainly be kept at the length longer than a certain value with the insulating member 16.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a winding portion of a transformer used in a switching power supply device, etc., and more specifically, the present invention relates to a method for manufacturing a winding portion of a transformer used in a switching power supply device, etc. The present invention relates to a method for easily manufacturing a transformer winding part that can comply with various safety standards.

As is well known, a power supply lance is a device in which a primary winding and a secondary winding are wound around a magnetic core that constitutes a common magnetic circuit, and a transformer function is performed by utilizing the electromagnetic induction phenomenon between them. It is. BACKGROUND ART In recent years, as various electronic devices have become smaller and lighter, highly efficient switching power supplies have rapidly advanced as power supply devices, and as their frequencies have been increased, power transformers have become significantly smaller. For example, in high-speed switching power supplies, an E-I type ferrite core, an E-E type ferrite core, or the like is used as the magnetic core, and there are many configurations in which a coil winding is applied to the central leg of the core.

Generally, each of the primary and secondary windings is wound in advance around a synthetic resin bobbin and inserted into the legs of the ferrite core.

The issue here is the quality of electrical insulation between the -order winding and the secondary winding. Since the secondary winding is usually directly connected to the commercial AC line, sufficient electrical insulation must be ensured between the device main body and the connected secondary winding. Therefore, the creepage distance between the secondary winding and the secondary winding is stipulated in each Inamugi standard, and how to easily satisfy this stipulation is an important issue in manufacturing. That's the point.

By the way, the conventional transformer winding section of type (B) has a structure as shown in FIG. 1, and is manufactured by the following complicated process. The bobbin 1 serving as the winding core has a very common structure in which a pair of flange members 3a and 3b are integrally formed at both ends of a hollow cylindrical body 2. First, insulating tape 4-a is applied to the outer surface of both ends of the hollow cylindrical body 2 of the bobbin 1 (the inner surface abutting positions of the flange members 3a and 3b).
, 4. Wrap b many times. Here, the width of the insulating tapes 4a and 4b is a dimension corresponding to the required creepage distance between the -primary winding and the secondary winding, and the height in the radial direction when wrapped is such that it accommodates the primary winding. The height is such that there is sufficient space for the building to move. Then, the primary winding 5 is wound a predetermined number of times between the box edge tapes 4a and 4b, and then the outermost circumference of the secondary winding 5 and the insulating tape 4a are wound.

A second wide insulating tape 6 so as to completely cover the outer periphery of 4b.
Wrap around. Finally, the transformer winding part was manufactured by winding the secondary winding 7 over the second wide insulating tape 6. In other words, in the prior art, the primary winding 1a5 and the secondary winding 7 are separated from each other. In order to ensure the creepage distance between the ends of the bobbin 1, insulating tapes 4a and 4b with a width equal to or larger than the required creepage distance (for example, about 6 mm) are first wound to a considerable height on both ends of the bobbin 1. A process of winding the wire to the height required to accommodate the wire was necessary. Wrapping the insulating tapes 4a and 4b is very cumbersome and requires a large number of manufacturing steps, resulting in poor productivity and a lack of cost reduction.

An object of the present invention is to eliminate the drawbacks of the prior art as described above, and to make it possible to set the creepage distance between the secondary winding and the secondary winding to a value specified by various safety standards. Another object of the present invention is to provide a new method for manufacturing a transformer winding portion that is easy to manufacture and can be manufactured at low cost.

The present invention, which can achieve such objects, has a modified bobbin body shape and a movable structure in which the flange member is divided into two parts, thereby simplifying the creepage distance between the primary and secondary windings. It can be adjusted to

That is, the present invention uses a bobbin having a structure in which flange members are fitted into both ends of the sleeve member so as to be slidable in the axial direction of the sleeve.First, the space between the flange members is narrowed and the inner winding is applied. A transformer winding in which both flange members are pulled out in a direction away from each other to form a wide width state, an insulating member is provided on the inner winding in that state, and an outer winding is further formed on the outer surface of the insulating member. This is the manufacturing method of the part.

Hereinafter, the present invention will be explained in more detail based on the drawings. FIGS. 2A to 2D are process explanatory diagrams showing an embodiment of the method for manufacturing a transformer winding portion according to the present invention. The bobbin 11 used in the present invention is significantly different from conventional bobbins and has a structure in which two opposing 4-flange members are separated.

In other words, this bobbin 11 has a cylindrical sleeve member 120
Flange members 13a are provided at both end portions, respectively.

The small-diameter fitting portion 13b fits into the sleeve member 12 and is slidable in the axial direction of the sleeve member 12. Here, the length of the sleeve member 12 corresponds to the winding width of the negative winding.

First, the outer diameter fitting portions of both flange members 13a, 13b are pushed into the sleeve member 12, and the inner ends of the flange members 13a, 13b hit the end of the sleeve member 12. The width is narrowed so that it fits. Then, the primary winding 15 is wound around the sleeve member 12 a predetermined number of times in the narrow state shown in FIG.
(See Figure 2A). - After winding the next winding 15, it is desirable to maintain the winding state as it is by thermocompression bonding, face bonding, or the like.

Next, as shown in FIG. 2B, both flange members 13a,
13b are pulled out in the direction separated from each other as shown by the arrows to make a wide state. These flange members 13a, 13
The pull-out distance b is a distance corresponding to the creepage distance between the primary winding and the secondary winding required by the applicable safety standards.

At this time, since the -th order winding 15 is wound on the sleeve member 12, the flange member 13a that is pulled out,
13b, an appropriate space will be formed between them.

In particular, if the primary winding is fixed with thermocompression bonding or a face plate as described above, the winding will not collapse when the flange members 13a and 13b are pulled out, and the required accurate space will be created. can be done.

Thereafter, as shown in FIG. 2C, the primary winding 15 is covered and fixed with an insulating member 16. In this embodiment, the insulating member 1
6, as shown in FIG. 3, trapezoidal projecting pieces 21 are continuous in one side direction on both side edges of the tape-shaped portion 20, which has a width approximately equal to the distance between both flange members 13a and 13b in the wide width state. It is an insulating member made of synthetic resin that is flexible and appears to be integrally molded. -Next winding 15 and flange member 1
3a and 13b, in such a direction that the end protruding piece 21 of the insulating member 16 fits into the space, and wrap it around the second winding 15, if necessary, using adhesive tape or the like. It is fixed.

In terms of ease of work, the flange members and the insulating member are spaced a little apart from each other, and after the insulating member is attached, the flange members are pushed in the direction in which they approach each other, so that the flange member and the insulating member are tightly attached. A better way is to let them do it.

Finally, as shown in the second diagram, the secondary winding 17 is wound around the outer peripheral surface of the insulating member 16 a necessary number of times.

With such a configuration, the negative winding 15 and the secondary winding 17
The creepage distance between the two can be reliably maintained at a certain value or more by the insulating member 16.

Although one embodiment of the present invention has been described in detail above, it is a matter of course that the present invention is not limited to only such a configuration.
It goes without saying that various changes can be made within the scope of the claims. In the above embodiment, the creepage distance is secured using a specially shaped insulating member having trapezoidal protruding pieces at both ends as shown in Figure 7-3.
It is not necessarily necessary to use an insulating member with the structure shown in Part B. For example, as shown in Figure 2B, both flange members are pulled out and set in a mold, and electrically insulating resin is injected into the space between the secondary winding and the flange member and onto the primary winding. An insulating member may be formed by this.

Also, when winding the secondary winding, the force is not too strong (
, and in the case of a configuration in which the winding state of the secondary winding is firmly maintained by thermocompression bonding, etc., it is possible to simply wrap a plate-shaped insulating member along the outermost circumference of the secondary winding. It is also possible to have a structure.

Since the present invention is a method of manufacturing a transformer winding section configured as described above, the creepage distance between the secondary winding and the secondary winding can be easily made to comply with various safety standards, and mass production is possible. It has many excellent effects, such as being able to reduce costs because it is rich in energy and easy to manufacture.

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[Brief explanation of the drawing]

Figure 1 is an explanatory diagram showing an example of the prior art, Figure 2 A,
Figure B and Figure 2 C2 second diagram are respectively 1-
FIG. 3 is a process explanatory drawing showing a method for manufacturing the lance winding portion, and FIG. 3 is an explanatory drawing showing an example of an insulating member used therein. 11... Bobbin, 12... Sleeve member, 13a. 13b・Flange member, 15...-Next winding, 16...
- Insulating member, 17... Secondary winding. Patent applicant Fuji Electrochemical Co., Ltd. Agent Shigeru Estimate

Claims (1)

[Claims] 1 Flange members are fitted into both ends of the sleeve member so that they can slide freely in the axial direction of the sleeve.Using a bobbin with this structure, first the inner winding is applied by narrowing the space between the flange members, and then the inner winding is applied between the flange members. A transformer winding unit characterized in that the members are pulled out in a direction away from each other to form a wide width state, an insulating member is provided on the inner winding in that state, and an outer winding is further formed on the outer surface of the insulating member. manufacturing method.