JP2000228310A - Common mode choke coil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a common mode choke coil which satisfactorily keeps the pitch precision of its ends, and is superior in board mountability. SOLUTION: In a common mode chock coil, having a winding 7 on a core case 1a in which a toroidal core is put, and a fixing base 1b for supporting the winding 7, the winding 7 and fixing base 1b are in a mutually movable state, and an end 8 of the winding 7 drawn out onto the opposed surface side of the fixing base 1b through a hole 3b formed in the fixing base 1b is drawn out longer, by a force which presses the winding 7 in towards the fixing base 1b, and the gap 9 between the winding 7 and the fixing base 1b is decreased.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a structure of a common mode choke coil used for a noise filter circuit and the like.

[0002]

2. Description of the Related Art FIG. 6 is an external view of a conventional common mode choke coil. FIG. 6A is a front view, and FIG.
Is a side view. In FIG. 6, two windings 7 are provided on a core case 1 containing a toroidal core made of a magnetic material. The two windings 7 are connected to a partition 2 provided therebetween.
And electrical insulation is achieved. The terminal 8 of the winding 7 is drawn out to the back side through the hole of the fixing base 1b, and the projection 3a of the core case 1 is fitted into the recess 2b provided on the fixing base 1b, and the winding 7 and the fixing base 1b is configured as one piece.

[0003]

When the common mode choke coil is mounted on the circuit board, the terminal 8 of the winding 7 pulled out through the hole of the fixing base 1b is inserted into the circuit board as it is and soldered. Connected and fixed. The fixed base 1b also has a role of maintaining the pitch accuracy of the terminal 8.

However, while the pitch accuracy of the terminal 8 is maintained near the back surface of the fixed base 1b, when the tip of the terminal 8 is pulled out from the back surface of the fixed base 1b long,
The terminal 8 is easily deformed, and the pitch accuracy is reduced. FIG. 5 is a diagram illustrating an example of a common mode choke coil in which pitch accuracy has been reduced due to deformation of the terminal 8. FIG. 5A is a front view, and FIG. 5B is a side view. Terminal 8
However, the common mode choke coil with reduced pitch accuracy cannot be mounted on the circuit board smoothly.
There is a need for correction or replacement with a common mode choke coil having terminals with normal pitch accuracy.

It is an object of the present invention to provide a common mode choke coil which has good terminal pitch accuracy and is excellent in mountability on a circuit board.

[0006]

According to the present invention, there is provided a common mode choke coil having a winding wound around a core case accommodating a toroidal core and a fixing base supporting the winding. The base and the base are movable with respect to each other, and the end of the winding pulled out to the opposite surface side of the base through the hole formed in the base is pulled out longer by a force pushing the winding toward the base. Along with
A common mode choke coil having a structure in which the gap between the winding and the fixed base is reduced can be obtained.

[0007]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing a common mode choke coil according to the present invention. 1A is a front view, and FIG.
1B is a side view, and FIG. 1C is a bottom view. FIG.
FIG. 3 is a diagram showing a core case used for the common mode choke coil according to the present invention. FIG. 2A is a front view, and FIG.
(B) is a side view. FIG. 3 is a diagram showing a fixing base used in the common mode choke coil according to the present invention. 3A is a front view, FIG. 3B is a side view, and FIG.
(C) is a bottom view.

The core case 1a is provided with a partition 2a having a total of two projections 3a on the side surface in order to provide electrical insulation between the windings in the center. The protrusion 3a has a two-stage claw 4
a, a nail 5a is formed. Convex part 3a, nail 4a, nail 5
“a” is formed integrally with the core case 1a.

The fixing base 1b is provided with a concave portion 2b for fitting with the core case 1a, and four holes 3b for passing the terminal 8 of the winding 7 therethrough.

As shown in FIG. 1, a winding 7 is wound around a core case 1a, terminals 8 of the winding 7 are inserted into holes 3b of a fixing base 1b, and a claw 5a of a projection 3a and a recess 2b are connected. The common mode choke coil is manufactured by fitting. At this time, there is a finite gap 9 between the winding 7 and the fixed base 1b.
Are formed.

FIG. 4 is a view showing a state before and after the common mode choke coil according to the present invention is mounted on the circuit board 10. FIG. 4A is a front view before mounting, and FIG.
4B is a side view before mounting, FIG. 4 (2a) is a front view after mounting, and FIG. 4 (2b) is a side view after mounting.

The common mode choke coil is mounted on the circuit board 1.
Before mounting on the wire 0, between the winding 7 and the fixed base 1b,
A relatively wide gap 9 is formed, and only the end of the terminal 8 of the winding 7 protrudes on the back side of the fixed base 1b. Therefore, the terminal 8 has high pitch accuracy without being deformed. Such a common mode choke coil can be easily mounted on the circuit board 10.

When the tip of the terminal 8 of the common mode choke coil matches the mounting position of the circuit board 10, the common mode choke coil is directed toward the circuit board 10, ie, the winding 7 is directed toward the fixed base 1b. When pushed lightly, the winding and the fixed base are movable with respect to each other, so that the terminal 8 is pushed deeper through the hole 3b of the fixed base 1b and inserted into the circuit board 10. At the same time, the gap 9 between the winding 7 and the fixed base 1b is reduced and substantially eliminated.

In the common mode choke coil according to the present invention, only the tip of the terminal 8 is exposed on the back surface of the fixed base 1b before the terminal 8 is mounted on the circuit board 10.
Has a high pitch accuracy with almost no deformation. The common mode choke coil of the present invention therefore withstands relatively crude handling and transport,
There is a feature that high pitch accuracy can be maintained.

The present invention can be applied not only to the common mode choke coil for a single-phase circuit described above, but also to a common mode choke coil for a three-phase circuit.

[0017]

As described above, according to the present invention, it is possible to obtain a common mode choke coil having good terminal pitch accuracy and excellent board mountability.

[Brief description of the drawings]

FIG. 1 is a diagram showing a common mode choke coil according to the present invention. 1A is a front view, FIG. 1B is a side view, and FIG.
(C) is a bottom view.

FIG. 2 is a diagram showing a core case used in a common mode choke coil according to the present invention. FIG. 2A is a front view, and FIG.
(B) is a side view.

FIG. 3 is a diagram showing a fixing base used in the common mode choke coil according to the present invention. FIG. 3A is a front view, and FIG.
3B is a side view, and FIG. 3C is a bottom view.

FIG. 4 shows a common mode choke coil according to the present invention;
FIG. 4 is a diagram showing a state before and after mounting on a circuit board. FIG. 4 (1a)
Fig. 4 (1b) is a front view before mounting, Fig. 4 (2a) is a front view after mounting, and Fig. 4 (2b) is a side view after mounting.

FIG. 5 is a diagram showing an example of a common mode choke coil in which pitch accuracy is reduced due to deformation of a terminal. 5A is a front view, and FIG. 5B is a side view.

FIG. 6 is an external view of a conventional common mode choke coil. FIG. 6A is a front view, and FIG. 6B is a side view.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 1a Core case 1b Fixed base 2, 2a Partition 2b Depression 3a Convex part 3b Hole 4a, 5a Claw 7 Winding 8 Terminal 9 Gap 10 Circuit board

Claims (1)

[Claims] 1. A common mode choke coil having a winding wound around a core case accommodating a toroidal core, and a fixing stand supporting the winding, wherein the common mode choke coil has a hole formed in the fixing stand. The ends of the windings pulled out to the opposite surface side of the fixed base are drawn out longer by the force pushing the windings toward the fixed base, and the gap between the windings and the fixed base is reduced. A common mode choke coil characterized by having a structure to perform.