JPH11176669A - Common mode choke coil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a work process and manufacturing cost, by forming a partition for partitioning center hole of a core housing, together with an annular cap. SOLUTION: An insulation case is composed of a double-tubular core housing 2 and an annular cap 3 integrated with a partition 5 partitioning a center hole 4 of the core housing 2. The cap 3 is mounted on the core housing 2 to cover the top face of a ferrite core 6 in the core housing 2 so that the partition 5 partitions the center hole 4 of the core housing 2, thereby isolating windings through the partition 5. This reduces a work process and cost because of no need for inserting the partition 5 later.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a common mode choke coil for suppressing noise in a power supply circuit of an electronic apparatus, and more particularly to a structure of an insulating case.

[0002]

2. Description of the Related Art A conventional common mode choke coil is:
As shown in FIG. 3, an insulating case formed of a double cylindrical core housing portion 2 that houses a cylindrical ferrite core 6 and a lid 3 that covers the top surface of the ferrite core 6 housed in the core housing portion. After winding a winding (not shown) on the outer periphery, a partition plate 5 was inserted into a groove 7 provided on the inner periphery of the lid 3 to separate the windings.

[Problems to be solved by the invention]

However, in the above structure, if the inner diameter of the center hole 4 of the core housing portion 2 through which the windings are inserted is small, the interval between adjacent windings becomes narrow unless a skilled worker carefully performs the winding operation. In some cases, the partition plate could not be inserted. In addition, the partition plate 5 and the lid 3 must be separately prepared, and there is a drawback that the cost is increased due to the large number of working steps.

[Means for Solving the Problems]

An object of the present invention is to reduce the number of working steps and the manufacturing cost by integrally forming a partition plate and a lid in the above configuration. That is, the present invention provides a winding around the outer periphery of an insulating case composed of a double cylindrical core accommodating portion accommodating a cylindrical ferrite core and an annular lid covering the top surface of the ferrite core accommodated in the core accommodating portion. In the wound common mode choke coil, a partition portion for bisecting the center hole of the core housing portion is formed integrally with the annular lid.

BEST MODE FOR CARRYING OUT THE INVENTION

An embodiment of the present invention will be described using an example. FIG. 1 is an exploded perspective view of a common mode choke coil of the present invention, and FIG. 2 is a top view of the same. 1 is an insulating case,
It comprises a double cylindrical core housing 2 and an annular lid 3, and the annular lid 3 is integrally formed with a partition 5 for bisecting the center hole 4 of the core housing 2. Reference numeral 6 denotes a cylindrical ferrite core housed in a space formed by the double cylinder of the core housing portion 2, and the annular lid 3 covers the upper surface of the ferrite core 6 housed in the core housing portion 2. is there. When the annular cover 3 is put on the core housing 2 housing the ferrite core 6, the center hole 4 of the core housing 2 is divided into 41 and 42 by the partition 5, so that the winding (not shown) is formed. Are reliably isolated by the partition 5.

【The invention's effect】

As described above, according to the present invention, the annular lid covering the upper surface of the ferrite core and the center hole of the core housing portion are bisected, and the partition portion for isolating the adjacent winding is integrally formed. Therefore, the partition can be attached at the same time simply by covering the annular lid, so that even when the center hole of the core housing portion of the insulating case is small, the partition can reliably isolate the windings from each other. No skill is required for work. Further, since it is not necessary to insert the partition part later, the number of working steps can be reduced, and the cost can be further reduced.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a common mode choke coil according to the present invention.

FIG. 2 is an assembled top view of the common mode choke coil of the present invention.

FIG. 3 is an exploded perspective view showing an example of a conventional common mode choke coil.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Insulating case 2 ... Core storage part 3 ... Annular lid 4 ... Center hole 5 ... Partition part 6 ... Ferrite core

Claims (1)

[Claims] 1. A common coil having a winding wound around an outer periphery of an insulating case comprising a double cylindrical core housing for accommodating a ferrite core and an annular lid covering an upper surface of the ferrite core accommodated in the core housing. A common mode choke coil, wherein a partition portion for bisecting a center hole of a core housing portion is formed integrally with the annular lid.