JPH0878254A - Common mode choke coil - Google Patents

Abstract

PURPOSE: To provide a common mode choke coil for use in an electronic equipment or the like, wherein the choke coil is large in current capacity and inductance, small in size, and capable of being formed of cheap material and automatically assembled. CONSTITUTION: A split magnetic core 11 is used, and coils 1 where round conductors are wound like eyeglasses in two or multiple layers are employed, whereby a common mode choke coil of this constitution has such a structure as a multilayered winding is easily attained, the choke coil 1 is enhanced in space factor, a wire winding operation or an assembly operation is easily carried out because windings are of a dispersed winding type simple in shape, a leakage magnetic flux decreases, and a magnetic coupling grows dense. Thus, a common mode choke coil of this constitution is more improved in characteristic than a conventional choke coil, lessened in size and cost, and capable of coping with a large current.

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 used in consumer electronic devices, industrial electronic devices and the like.

[0002]

2. Description of the Related Art A common mode choke coil has been used as a countermeasure component for removing electromagnetic noise by inserting it into a power source line of a switching power source. Conventionally, a single closed magnetic pole using a toroidal core or the like is used. A toroidal common mode choke coil is often used in which a winding having a same number of turns and two conductor wires wound in the same direction is wound in a path. In the common mode choke coil with this structure, two windings are wound around the closed magnetic circuit of the toroidal core, so it is wound by a manual winding or a special winding machine. Difficult and expensive with special winding machines. Also, in order to increase the inductance value, it is necessary to increase the number of windings. In closed magnetic circuits, the workability deteriorates due to the limitation of the winding space, and a large magnetic core must be used. There is a problem that the choke coil becomes large.

In order to improve this, the space factor of the winding is improved to make it smaller, the winding is easily automated, the windings between the coils are well balanced, and the performance of the choke coil is improved. A choke coil is shown in Japanese Patent Application No. 5-34434. That is, as shown in FIGS. 3 and 4, a U-shaped magnetic core 11 divided into two is used, a flat conductor wire is used as a conductor wire, and a coil 1 is formed by winding the conductor wire into a spectacle shape (see FIG. 4). ) Are prepared, and a U-shaped magnetic core 1 is attached to this coil 1.
There has been proposed a common mode choke coil in which the leg portions of No. 1 are respectively inserted and faced to each other to connect the joint surfaces of the magnetic core 11 to form a closed magnetic circuit. In this common mode choke coil, as shown in FIGS. 3 and 4, the first winding portion 2 and the second winding portion 6 which are formed of a rectangular conductor wire and have a spectacle shape are the same with respect to the magnetic path. Since the windings of the two coils 1 are arranged facing each other in the magnetic path, the directions of the magnetic fields due to the currents flowing through the two coils 1 cancel each other. It forms a choke coil. In this common mode choke coil, the coil layer is formed by one flat conductor wire, so that the winding state can be aligned winding with no space, the space factor of the winding is improved, and the automatic winding machine Although the point that winding is possible has been improved, when trying to obtain a common mode choke coil with a larger inductance, it is difficult to perform multi-layer winding because a rectangular conductor wire is used, and it is expensive to perform the winding. However, there is a problem that the choke coil becomes expensive because the flat conductor wire is expensive.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a common mode choke coil which eliminates these drawbacks and which has a large current capacity and inductance value, is small in size, and has a structure capable of being automatically assembled by an inexpensive material. Is to provide.

[0005]

According to the present invention, two conductor wires are wound around two or more split type closed magnetic circuit magnetic cores, and currents flowing through the respective windings are opposite to each other in the closed magnetic circuit. In a common mode choke coil formed by winding in a direction in which opposing magnetic fields are generated and canceling each other, a round conductor wire having a circular cross section is used as the conductor wire, and the round conductor wire is wound in a cylindrical shape in close proximity. Forming a first layer, further, in the upper or lower direction of the first layer, coaxial with the central axis of the winding of the first layer,
In addition, the conductor wire is wound in a cylindrical shape in close proximity to form a first winding portion having a laminated structure of a plurality of layers, and the first winding portion has a winding end portion, and the first winding portion has the first winding portion. The first winding portion has a central axis parallel to the central axis of the first winding portion, and is wound so as to form a spectacle shape in cross section together with the first winding portion. And a second winding portion having a shape symmetrical to the first winding portion, the first winding portion and the second winding portion being formed.
, Two winding coils are made, the two coils are made to face each other, and a split type closed magnetic circuit magnetic core piece is attached to each of them to assemble them so as to form a closed magnetic circuit. The first winding portion and the second winding portion formed on the conductor wire are attached to the closed magnetic circuit magnetic core so as to generate magnetic fields in the same direction, and the two coils face each other. Mounted on the closed magnetic circuit core in the state,
The common mode choke coils are characterized in that they are mounted in directions in which opposite magnetic fields are generated with respect to the magnetic cores of the closed magnetic circuit.

[0006]

[Operation] By using the split core and the coil shaped like the spectacles with the round conductor wire, the space factor of the coil can be improved and the automation is facilitated. And the coil characteristics are improved as compared with the conventional choke coil, and a small-sized common mode choke coil that can handle a large current can be supplied at low cost. or,
By forming the coil into two layers or multiple layers, a high inductance value can be obtained even with the same winding length. Since the rectangular conductor wire has poor formability and becomes expensive, using a round conductor wire facilitates two-layer winding and multi-layer winding, and is manufactured with inexpensive equipment and at a low cost. it can.

[0007]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an external perspective view of an embodiment of the common mode choke coil of the present invention. FIG. 2 is an external perspective view of an eyeglass-shaped coil that constitutes the common mode choke coil of the embodiment shown in FIG.

As shown in FIG. 2, one spectacle-shaped coil 1 constituting the common mode choke coil of the present invention is formed by winding a round conductor wire into a cylindrical shape to form a winding of the first layer 3. Then, the winding end is folded back to the outside of the winding of the first layer 3, the second layer 4 is wound by the same number of turns, and is reciprocally wound to the winding start position to form the first winding portion 2. To do. A second winding portion having a spectacles-shaped cross section together with the first winding portion 2 at the tip of the first winding portion 2 and configured such that the central axes of the windings are parallel to each other. 6 is formed, and the first winding portion 2 and the second winding portion 6 form the coil 1 having a spectacle-shaped cross section. Incidentally, in the coil 1 having the two winding portions made of this one conductor wire, when the two winding portions are inserted into the U-shaped magnetic core 11, magnetic fields in the same direction are generated. As described above, the winding end of the first winding portion 2 is connected to the second winding portion 6 in an 8-shape and is wound in the reverse rotation direction when viewed from the axial direction. Figure 2
FIG. 2A shows an example of two-layer winding, showing a state viewed from the winding start 9 side and the winding end 10 side, and FIG. 2B shows a state viewed from the back side. The first winding portion 2 and the second winding portion 6 are
It has a symmetrical structure with the same number of layers and windings.

Ferrite U for two-part closed magnetic circuit
Two 11-shaped magnetic core pieces are prepared. Next, the two coils 1 described above are prepared. As shown in FIG. 1, two coils 1
Are arranged facing each other so that the winding start 9 and winding end 10 portions of each coil 1 are on the outside, and the insulating collar 12 is attached to the root of the leg of the U-shaped magnetic core 11, and The insulating cylinder 13 is attached to the leg portion of the core 11, and the magnetic core 11 is pushed from the outside so that the leg portion is inserted into the hollow portion of the coil, and the insulating partition plate 14 is inserted between the coil 1 and the coil 1. Then, the joint portions of the leg portions of the magnetic core 11 are closely attached and fixed. The winding start 9 and winding end 10 parts of each coil 1 are used as external connection terminals, but since they are assembled facing each other, the external connection terminals drawn out in the same direction (respective winding start and winding end) are input. Side or output side. The insulating member 16 can be omitted depending on the specifications of the coil. In the common mode choke coil thus completed, when the current flows from the input terminal of each coil to the output terminal side, the magnetic fields created by the respective coils 1 act so as to cancel each other, and the common mode choke coil is I am configuring.

As described above, the assembly of the common mode choke coil of the present invention has been described. The coil has two round conductor wires.
Since the coil is wound in a parallel cylindrical shape, it is easy to automate the winding work. In particular, since a round conductor wire is used, kinking of the wire material in the winding does not pose any problem. With a simple existing winding machine, we could make a precise winding and make a coil with no variation in shape. Moreover, the round conductor wire is commonly used and can be obtained at low cost. Compared with the toroidal coil type, the obtained common mode choke coil can be a product with less variation, and can be miniaturized. We were able to supply a common mode choke coil with high width and high inductance.

An example in which a U-shaped closed magnetic circuit magnetic core is used by using a coil of two-layer winding has been described above, but a multi-layer winding of two or more layers also has a UI core or an LL-shaped magnetic core. Similar effects could be obtained with a split type magnetic core or a combination of a plurality of I-shaped magnetic cores.

[0012]

As described above, according to the present invention,
A round conductor wire was wound back and forth in multiple layers to form a cylindrical first winding, and further, in the same shape as the first winding, a spectacle-shaped coil was formed by combining with the first winding. Since a coil is manufactured and assembled into a split type closed magnetic circuit magnetic core to form a common mode choke coil, the wire can be obtained at low cost and multi-layer winding is easy. It is easy to use, and it can be used at a low price because it can be used as a winding machine, and since it uses a split-type closed magnetic circuit magnetic core and a spectacle-shaped coil, it is easy to take electrical insulation and Since the coupling is tight, the coil characteristics are improved, the capacity can be increased, and the assembly is easy, the small-sized and large-capacity common mode choke coil can be supplied at low cost.

[Brief description of drawings]

FIG. 1 is an external perspective view showing an embodiment of a common mode choke coil of the present invention.

2 is an external perspective view showing a spectacle-shaped coil used in the common mode choke coil shown in FIG. 1, and FIG.
Is a view from the front view, and FIG. 2B is a view from the back.

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

FIG. 4 is an external perspective view showing a box-shaped coil composed of flat conductor wires used in the common mode choke coil shown in FIG.

[Explanation of symbols]

 1 coil 2 1st winding part 3 1st layer 4 2nd layer 5 winding end of 1st winding part 6 2nd winding part 7 1st layer 8 2nd layer 9 winding start 10 End of winding 11 Magnetic core 12 Insulating flange 13 Insulating cylinder 14 Partition plate 15 Drawing groove 16 Insulating member

Claims (1)

[Claims] 1. Two or more split type closed magnetic circuit cores are provided with two
In a common mode choke coil formed by winding individual conductor wires and winding the currents flowing in the respective windings in directions that cancel each other by generating opposite magnetic fields in the closed magnetic circuit,
A round conductor wire having a circular cross section is used as the conductor wire, and the first conductor layer is formed by winding the round conductor wire close to each other to form a first layer, and further in the upper or lower direction of the first layer, The conductor wire is wound in a cylindrical shape coaxially with and adjacent to the central axis of the first layer winding to form a first winding portion having a laminated structure of a plurality of layers. , Having a central axis parallel to the central axis of the first winding portion at the end of the winding end portion of the first winding portion, and forming a spectacle shape in cross section together with the first winding portion The number of turns and the number of layers are the same as those of the first winding part,
A second winding portion having a shape symmetrical to the first winding portion is formed, two coils including the first winding portion and the second winding portion are produced, and the two coils are formed. Are opposed to each other, and a split type closed magnetic circuit magnetic core piece is attached to each, and assembled so as to form a closed magnetic circuit. At this time, the first winding portion and the second winding portion formed on the same conductor wire are assembled. The parts are attached to the closed magnetic circuit core in directions that generate magnetic fields in the same direction, and the two coils are attached to the closed magnetic circuit core in a state of facing each other, and the two coils are attached to the closed magnetic circuit core with respect to each other. And a common mode choke coil characterized in that it is mounted in a direction in which a reverse magnetic field is generated.