JP2002313646A - Winding-type common mode choke coil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reliable winding-type common mode choke coil which incurs no deterioration in withstanding voltage nor defective insulation due to a short circuit generated by an end part of a winding brought into contact with or drawn near to an adjacent terminal electrode. SOLUTION: The winding-type common mode choke coil comprises a core material having a square pillar-like winding core section and collars disposed on both ends of the winding core section. The collar sections are formed with the terminal electrodes, to which the end parts of a plurality of coils wound around the winding core section are connected. At least four terminal electrodes are provided in the winding-type common mode choke coil. Cutout recesses are formed in both end parts of the winding core section which are in contact with base sections on the inside of the collar sections formed with the terminal electrodes. The cutout recesses serve for wiring recesses for guiding the end parts of the windings.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wound type common mode choke coil used for removing common mode noise.

[0002]

2. Description of the Related Art Generally, a common mode choke coil is
As shown in the electric circuit diagram of FIG. 5, the circuit has a winding 3 connected between the input terminal 1a and the output terminal 2a, and a winding 4 connected between the input terminal 1b and the output terminal 2b. These windings 3 and 4 are bifilar wound around a core member made of a magnetic material such as a ferrite core. FIG. 6 is a perspective view of the core member viewed from the bottom side (electrode surface). As shown in the figure, a core member 10 includes a quadrangular pillar-shaped core portion 11 around which the windings 3 and 4 are wound, and rectangular flange portions 12 and 13 disposed at both ends of the core portion 11, respectively. And at its tip end four terminal electrodes 1a, 1b and 2a, 2b
Are formed.

FIG. 7 is a bottom view of the common mode choke coil 20 wound around the core member 10 of FIG. As shown in the figure, windings 3 and 4 are provided on a core 11 of a core member 10.
Is wound. The ends 3a, 3b and 4a, 4b of the windings 3 and 4 are connected to terminal electrodes 1a, 2a and 1
b and 2b are electrically connected by a method such as soldering or welding.

When connecting the ends 3a, 3b and 4a, 4b of the windings 3 and 4, such a conventional winding type common mode choke coil 20, as shown by an arrow G in FIG. End 3a is adjacent to the terminal electrode 1b adjacent to the terminal electrode 1a, or the end 4b of the winding 4 is adjacent to the terminal electrode 2a adjacent to the terminal electrode 2b, and there is a problem that short-circuit occurs due to contact. . In addition, if a certain distance cannot be ensured even without contact, there is a problem that the withstand voltage deteriorates and insulation failure occurs.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention solves the above-mentioned problem by causing the end of the winding to approach or contact an adjacent terminal electrode, resulting in deterioration of withstand voltage, poor insulation or short-circuit. An object of the present invention is to provide a winding type common mode choke coil having high reliability without occurrence.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a core material having a quadrangular pillar-shaped core and flanges disposed at both ends of the core. A wound common mode choke coil in which a terminal electrode is formed on a flange portion and ends of a plurality of windings wound around a core portion are connected, and at least four terminal electrodes are provided. A notch groove is provided at both ends of the winding core portion at the inner root of the flange portion, and a wiring groove for guiding ends of a plurality of windings is provided. Alternatively, it is characterized in that corners of both end edges of the core in the same plane parallel to the terminal electrode surface are cut off and chamfered.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION A wound type common mode choke coil of the present invention uses a core material having a quadrangular pillar-shaped core and flanges disposed at both ends of the core. A terminal electrode is formed on the bottom surface of the flange, and ends of a plurality of windings wound around the core are connected. The flanges at both ends are provided with at least four terminal electrodes, and cut grooves are provided at both ends of the core in contact with the base inside the flange on which the terminal electrodes are formed. Alternatively, the corners of both ends of the surface of the core portion parallel to the terminal electrode surface are cut off and chamfered.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a winding type common mode choke coil according to an embodiment of the present invention.

FIG. 1 is a bottom perspective view showing a main part of a core member forming a wound common mode choke coil according to the present invention. FIG. 2 is a perspective view (a) of a bottom surface of a wound type common mode choke coil formed by winding a winding around the core member of FIG.

The wound common mode choke coil 20a of the present invention uses a core member 10a as described below, instead of the core member 10 of the wound common mode choke coil 20 described with reference to FIGS. Things. As a material of the core member 10a, for example, a magnetic material such as ferrite or an insulator material such as alumina is used. In FIGS. 1 to 4, the portions denoted by the same reference numerals as those in FIGS. 5 to 7 indicate the same portions or corresponding portions.

As shown in FIG. 1, a core member 10a has a core 11a around which windings 3 and 4 are wound, and rectangular flanges 12 and 13 disposed at both ends of the core 11a. And Terminal electrodes 1 a and 1 b are formed at the distal end of the flange 12, and the terminal electrodes 2 a
a and 2b are formed. Each terminal electrode is formed by applying a silver paste and baking at a high temperature. Core part 1
Notched grooves 5a and 5b, which are wiring grooves for guiding the winding ends, are provided at the inner roots of the flanges 12 and 13 at both ends of 1a. The notch grooves 5a and 5b have a width of about two-half the wire diameter, a depth of about one-third of the thickness, and a wedge-shaped cross section that becomes shallower from the outer surface to the center in the winding direction. It is a groove.

As shown in FIG. 2, a winding type common mode choke coil 20a using such a core member 10a has winding start ends 3a, 4a of windings 3, 4 wound around a winding core 11a. Is routed along a notch groove 5 a provided in the core at the inner root of the flange 12, and the terminal electrode 1 of the flange 12 is
a, 1b. Winding end 3b of windings 3, 4;
4b is a winding groove 5 provided in the core at the inner root of the flange 13.
b, and the terminal electrodes 2a, 2b of the flange 13
Connected to. The ends 3a, 3b and 4a, 4b of the windings 3, 4 are formed by soldering, welding, or the like to a wire in a state where the insulating film and the like are removed in advance and copper is exposed to the terminal electrodes 1a, 1b and 2a, 2b. The method of making an electrical connection is adopted.

By arranging the ends 3a, 3b and 4a, 4b of the windings 3, 4 along the cutout grooves 5a, 5b provided in the winding core, the A in FIG. As shown in the -A cross-sectional view, the end 3a of the winding 3 is connected to the terminal electrode 1a along a cutout groove 5a provided in the core. Therefore, the end 3a of the winding 3 can be wired without being close to or in contact with the terminal electrode 1b adjacent to the terminal electrode 1a as shown in FIG. 2B. Similarly, the end 4b of the winding 4 is connected to the terminal electrode 2b along the cutout groove 5b provided in the core. For this reason, since the end 4b of the winding 4 can be wired without contacting or approaching the terminal electrode 2a adjacent to the terminal electrode 1a, a short circuit occurs with the adjacent terminal electrode, and the withstand voltage deteriorates and insulation failure occurs. A highly reliable wound common mode choke coil without fear can be provided.

FIGS. 3 and 4 are a bottom view (a) and a cross-sectional view (b) of a main part showing the structure of a core member constituting a wound type common mode choke coil according to another embodiment of the present invention. .

FIG. 3 (a) shows a core material 10b provided with four terminal electrodes, and a core 11b is chamfered 6a, 6b by cutting out both side edges of the core on the same bottom side as the terminal electrodes. It is formed. The winding core 11b is formed in a trapezoidal shape leaving a center as shown in the BB cross-sectional view of FIG. 3 (b). And a structure that can be used freely without considering the wire diameter of the winding because there is no notch groove. The winding state of the winding is the same as that of the above-described embodiment, and will not be described.

FIG. 4A shows six terminal electrodes 1a, 1a and 1b.
core material 10c provided with b, 1c and 2a, 2b, 2c
Notched grooves 7a and 7b, which are wiring grooves for guiding winding ends, are provided at the inner roots of the flanges 12 and 13 at both ends of the core 11c. The notch grooves 7a and 7b have a width of about three-half the wire diameter of the winding, a depth of about one-third of the thickness, and a direction from the outer surface to the other outer surface in the same direction as the winding direction. It is a wedge-shaped groove whose shallow cross-section is square. In this way, by winding the winding ends connected to the terminal electrodes 1a, 1b and 2c, 2b along the notch grooves, the terminal electrode 1
The wiring can be performed without contacting or approaching the terminal electrodes 1b and 1c adjacent to the terminal electrodes a and 1b and the terminal electrodes 2b and 2a adjacent to the terminal electrodes 2c and 2b. Therefore, it is possible to provide a highly reliable wound common mode choke coil which does not cause a short circuit with the adjacent terminal electrode, does not cause deterioration of withstand voltage, or causes insulation failure.

[0017]

As described above, the winding type common mode choke coil of the present invention is a wiring groove for guiding the end of the winding to the inner root of the flange at both ends of the winding core. By forming the notch groove, the end of the winding can be wired without contacting or approaching the adjacent terminal electrode, which may cause a short circuit with the adjacent terminal electrode, deterioration of the withstand voltage, or insulation failure. And a highly reliable wound-type common mode choke coil can be provided.

[Brief description of the drawings]

FIG. 1 is a perspective view of a core member used in a wound type common mode choke coil according to an embodiment of the present invention, as viewed from a bottom surface.

FIG. 2 is a perspective view (a) and a sectional view (b) of a main part of a wound type common mode choke coil according to an embodiment of the present invention as viewed from the bottom.

FIG. 3 is a perspective view (a) of a core member used in a wire-wound common mode choke coil according to another embodiment of the present invention, as viewed from the bottom, and a cross-sectional view of a main part thereof (b).

FIG. 4 is a perspective view (a) of a core member used in a wound type common mode choke coil according to another embodiment of the present invention, as viewed from the bottom, and a cross-sectional view of a main part thereof (b).

FIG. 5 is an electric circuit diagram of a common mode choke coil.

FIG. 6 is a perspective view of a core member constituting a conventional wound-type common mode choke coil as viewed from the bottom.

FIG. 7 is a bottom view of a conventional wound common mode choke coil.

[Explanation of symbols]

 10a core member 11a winding core part 12, 13 flange part 1a, 1b, 2a, 2b terminal electrode 3, 4 winding 3a, 4a, 3b, 4b winding end

Claims (2)

[Claims] 1. A core material having a quadrangular pillar-shaped core and flanges disposed at both ends of the core, wherein a terminal electrode is formed on the flange, and the core is In the winding type common mode choke coil in which the ends of the plurality of windings wound around are connected to the terminal electrodes, at least four terminal electrodes are provided, and the inside of the flange portion in which the terminal electrodes are formed. A wound common mode choke coil characterized in that cut grooves are provided at both ends of a winding core at the base. 2. A core material having a quadrangular pillar-shaped core and flanges disposed at both ends of the core, wherein a terminal electrode is formed on the flange, and the core is A winding type common mode choke coil in which ends of a plurality of windings wound around the terminal electrode are connected to the terminal electrode, and at least four terminal electrodes are provided, and a surface of a core portion parallel to the terminal electrode surface is provided. A wound common mode choke coil characterized in that the corners of both edges of the coil are cut off and chamfered.