JPH0539607Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a common mode coil that has small variations in performance and is easily assembled.

(Prior art) Common mode coils used in line filters are attached to printed circuit boards.
The requirements for this common mode coil are:
Variations in performance are small and assembly is easy. Although consideration has been given to this point in conventional common mode coils, it is still far from perfect.

Here, the conventional structure of the common mode coil will be explained. First, the coil bobbin 3 shown in FIG. 6 has a winding body 1 in the center and a coil bobbin 3 having terminal pins 2 inserted into the printed circuit board at the bottom. After the wire is applied, a U-shaped magnetic core 5 is attached from both sides to a hole 4 formed in the coil bobbin 3, and the outside thereof is gripped by a U-shaped metal band 6. 7 is a partition plate provided at the center of the winding body 1. The common mode coil having this structure is used by inserting the terminal pin 2 into a hole in a printed circuit board (not shown) and fixing it by soldering.

What is shown in FIG. 7 is another conventional structure that is an improved version of the one shown in FIG. In this case, a partition plate 7 is provided in the center, and the winding body 1 is provided on both sides of the partition plate 7.
Two coil bobbins 3 are provided, and the winding body 1 is
After winding the coil bobbins 3, the two coil bobbins 3 are placed side by side, and a bobbin fixture 9 with a hole 8 in the side wall is installed from above, and a U-shaped magnetic core 5 is inserted from the outside of the bobbin fixture. It is intended to be fitted. Both sides of the magnetic core 5 are held by U-shaped metal bands 6, similar to the one shown in FIG. Even in this structure, the terminal pins 2 are inserted into the holes of the printed circuit board and fixed.

(Problem to be solved by the invention) Among the conventional structures mentioned above, the one in Figure 6 is used when there is a demand for reducing the height from the printed circuit board without changing the magnetic core shape depending on the application. ,
There is a problem in that it is extremely difficult to deal with this without reducing the winding volume, that is, without reducing the inductance of the common mode yoke.
This can be achieved by reducing the wire diameter of the winding, but
If this is done, the current capacity will naturally become smaller.

On the other hand, in the structure shown in FIG. 7, the winding parts are arranged side by side, so the winding capacity is not reduced, that is, the inductance is not reduced.
Although the height dimension can be reduced, when used as a common mode coil, if special parts are not used to manage the mutual positional relationship of the two coil bobbins, variations in mutual positional relationship will occur, and as a common mode coil bobbin. There is a problem in that the variation in characteristics, that is, the variation in the common mode reduction ratio becomes large.

In a common mode cheese yoke, the magnetic flux caused by the normal mode current flowing through each coil must cancel each other out, so that the impedance of the common mode cheese yoke against the normal mode current must be extremely small. If variations occur, variations will occur in the canceling effect.

The present invention solves these problems, reduces the variation in characteristics as a common mode chain yoke, reduces the number of parts, and simplifies the structure without using a specially structured coil bobbin fixture.
This was accomplished as a solution to the problem of obtaining a common mode coil whose height from the printed circuit board can be reduced.

(Means for Solving the Problems) As a means for solving the above problems, the present invention provides a magnetic core storage frame 10 having a roughly square shape having a rectangular hole 11, and a partition plate at least at the end. 12 are provided, and the four corner portions of the partition plate 12 of the winding body 14 are provided with recesses 15 and protrusions 1 in the magnetic core storage frame 10.
6. Position and install using the concave and convex engagement,
This magnetic core storage frame 10 is provided with a terminal 17 for connecting the winding, and the end of the winding is connected to the side electrode of the terminal 17.
A common mode coil characterized in that a U-shaped magnetic core 18 is inserted into the winding body 14 from the outside of the magnetic core storage frame 10 to which the winding body 14 is attached through the rectangular hole 11. That's what I got.

(Function) With such a configuration, the two half-assembled winding bodies 14 are wound, and then they are placed side by side and fixed against the magnetic core storage frame 10. The structure in which the U-shaped magnetic core 18 is inserted allows the height from the printed circuit board to be lowered without reducing the winding volume. Since the partition plate 12 of the winding body 14 is attached to the magnetic core storage frame 10 with its four corners positioned, variations in the mutual positional relationship of the coils are reduced.

(Embodiment) Next, an embodiment of the present invention will be described with reference to FIG. 1. Reference numeral 10 denotes a magnetic core storage frame having a roughly square shape and having a rectangular hole 11. There may be one hole 11 as a whole, but a wall 10a may be provided at the center of the opposing portions of two magnetic core storage frames 10 as shown in the figure.
This hole 11 has partition plates 1 at the ends and the center.
The winding body 14 provided with wires 2 and 13 is applied and fixed at the end portion of the partition plate 12. In order to accurately locate this part, recesses 15 are provided on the magnetic core storage frame 10 side at parts facing the four corners of the partition plate 12.
At the four corners of 2 there are protrusions 1 that fit exactly into the recesses 15.
6 is provided.

A stepped portion 10b is formed at the lower part of the magnetic core storage frame 10, and an L-shaped electrode 17 is attached to the stepped portion 10b by burying the middle portion thereof as shown in FIG. (See Figure 3). The portion of the electrode 17 that protrudes downward from the magnetic core storage frame 10 is formed as a connecting portion that penetrates the printed circuit board, and the portion that protrudes laterally is used as a portion that wraps around the end of the winding. In FIG. 1, the reference numeral 18 is a magnetic core, which has a U-shape. In the above configuration, two winding bodies 14 and two magnetic cores 18 are provided which are integrated with the magnetic core storage frame 10.

Assembly using each of the parts constructed in this way is carried out as follows. First, the two winding bodies 14 are wound with wire, and the two winding bodies 14 after winding are arranged side by side. Then, the protrusions 16 provided on the partition plates 12 at the respective ends are fitted into the recesses 15 formed in the magnetic core storage frame 10, and after mutual positioning, the two are coupled. In this state, the ends of the windings are tied around and connected to the terminal portions of the electrodes 17 that protrude to the sides of the magnetic core storage frame 10. In this case, it is preferable to provide a notch 12a in the side of the partition plate 12 and a notch 13a in the lower part of the partition plate 13 so that the winding can be easily routed (see Fig. 4).
(See Figure 5). After the windings are connected, the U-shaped magnetic core 18 is inserted into the hole 11 from the outside of the magnetic core storage frame 10.
It is inserted into the winding body 14 through the wire, and fixed by adhesive or the like. After the whole is integrated in this way,
The assembly work is completed by inserting and fixing the portion of the electrode 17 that protrudes below the magnetic core storage frame 10 into a hole in a printed circuit board (not shown).

(Effects of the Invention) Since the present invention is a common mode coil configured as described above, it has the following effects.

Since the ends of the windings are twisted and connected to the side electrodes, the mounting height can be lowered without reducing the volume of the windings.

The structure is simple, the number of parts is small, and assembly is easy.

Since the positioning between a plurality of (two in the embodiment) winding bodies and between the winding bodies and the magnetic core storage frame can be ensured by the convex-concave engagement at the four corners of the partition plate 12, the common mode This means that there will be no variation in the characteristics of the yoke.

Winding work can be automated.

Since the magnetic core is not exposed, other electronic components can be placed close to each other.

[Brief explanation of the drawing]

Figure 1 is an exploded perspective view of an embodiment of the present invention, Figure 2 is a front view of the electrode in Figure 1, and Figure 3 is a front view of the electrode in Figure 1.
The figure is a front view of the magnetic core storage frame in Figure 1, Figures 4 and 5 are front views of the partition plate in Figure 1, and Figure 6 is an exploded view of an example of a conventional common mode coil. FIG. 7 is an exploded perspective view of another conventional example. 10... Magnetic core storage frame, 11... Hole, 12, 13
... Partition plate, 14 ... Body for winding, 15 ... Protrusion, 16 ... Recess, 17 ... Electrode, 18 ... Magnetic core.

Claims (1)

[Scope of utility model registration request] A magnetic core storage frame having a roughly square shape having a rectangular hole and a plurality of winding body parts provided with partition plates at least at the ends thereof are provided, and the partition plates of the winding body parts are provided. The four corner portions of the magnetic core storage frame are positioned by concave-convex engagement, and the magnetic core storage frame is provided with terminals for connecting the winding to connect the ends of the winding,
A common mode coil characterized in that a U-shaped magnetic core is inserted into the winding body through the rectangular hole from the outside of the magnetic core storage frame to which the winding body is attached.