JPH0955324A - Common mode chalk coil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a d.c. resistance of a conductor by forming a first coil by winding a plate-like conductor, winding it reversely by the same turns in an approximately 8-shape and inserting and arranging a second coil whose inner diameter is smaller than that of the first coil integrally inside the first coil. SOLUTION: A plate-like conductor of a large cross sectional area is wound and the conductor is wound reversely in an approximately 8-shape by the same winding turns. An extraction line 6 is provided to both ends of a plate-like conductor and an approximately 8-shaped plate-like conductor is made a first coil 3. A second coils 4 having a cut 5 in a central part of a plate-like conductor for fitting to the first coil 3 and a small inner diameter which has the same shape and number of turns as the first coil 3 is inserted into an inside thereof integrally. Since a plate-like conductor is used, an area of a conductor becomes large and a d.c. resistance of a conductor can be reduced.

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 which is inserted into a power supply line of consumer or industrial electronic equipment and used as an electronic component for suppressing electromagnetic noise.

[0002]

2. Description of the Related Art Conventionally, common mode choke coils are
As shown in FIG. 4, a copper wire is used as a conductor, and two coils are prepared by winding the copper wire into a figure-eight shape. Inside the first coil 9, the shape and the number of turns are the same, and the inner diameter is small. The second coil 10 is inserted and arranged so as to be integrated, and thereafter, as shown in FIG. 3, the magnetic leg 8 of the split type closed magnetic circuit magnetic core 7 made of a soft magnetic material is attached to the first coil 9 and the first coil 9. A structure in which the second coil 10 is inserted is proposed.

In this common mode choke coil, a first wire 9 and a second coil 10, each of which is formed of a copper wire in the shape of a figure 8, are wound in the same direction with respect to their respective magnetic paths. Since the two coils are arranged in the magnetic path so as to face each other, the directions of the magnetic fields due to the currents flowing through the respective coils are common mode choke coils configured to cancel each other.

The above-mentioned common mode choke coil has a structure in which the second coil 10 is integrally inserted and arranged inside the first coil 9, so that it can be easily assembled. Further, since the length of the magnetic leg of the split type closed magnetic circuit magnetic core is sufficient for the length of one coil, the magnetic path is shortened, and the inductance is increased even with the same number of turns as in the conventional case, so it is necessary to increase the number of turns. However, when the same inductance as the conventional one is required, the number of windings can be small, and therefore the size and weight can be reduced.

[0005]

However, when it is attempted to mount it on an electronic device having a large input capacity, it is necessary to make the wire diameter of the winding wire thicker in order to cope with a large current. Therefore, the number of windings is limited. There was a problem that it was not suitable for large current.

An object of the present invention is to provide a small-sized common mode choke coil suitable for large currents and having improved high frequency characteristics.

[0007]

According to the present invention, since the conductor wire is shaped like a plate, the cross-sectional area is increased,
DC resistance can be reduced and large current can be supported. Adhesion between conductors is good, frequency characteristics as a common mode choke coil are improved, and resonance points of individual coils are improved. A common mode choke coil with less variation can be obtained.

A second coil having a small inner diameter, which has two 8-shaped plate-shaped conductors having different coil inner diameters and has a notch at the center of the plate-shaped conductor, is provided inside the first coil. It is possible to easily assemble by arranging so as to be integrated so that the split type closed magnetic circuit magnetic core is inserted into the coil. Since the length of the magnetic leg of the split type closed magnetic circuit core is slightly longer than that of one coil, the inductance is slightly reduced, but a common mode choke coil in which the number of turns can be easily increased can be obtained.

That is, according to the present invention, a linear conductor whose surface is subjected to an insulation treatment is wound, the conductor is further reversed by the same number of turns, and the conductor is wound into a figure-eight shape, and both ends of the conductor are drawn out. , A large coil and a small coil are made, a small coil is inserted and installed inside the large coil, and in a transformer coil formed by abutting multiple magnetic cores, a thin coil with a width almost the same as the length of the two coils. Using two flat plate-shaped conductors, winding the plate-shaped conductor,
The same number of turns is reversed, and the first coil is wound to form a first coil, a lead wire is provided at the end, the number of turns is the same, and the first coil is provided at the center of the plate-shaped conductor. A common mode choke coil characterized in that a notch for engaging with the coil is provided, and a second coil having an inner diameter smaller than that of the first coil is inserted and arranged so as to be integrated inside the first coil. is there.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Since the conductor has a plate-like shape, its cross-sectional area becomes large, so that a common mode choke coil capable of handling a large current and reducing a DC resistance is provided. Become. Further, since the adhesion between the conductors is improved, the stray capacitance created by the coil is reduced, so that the resonance frequency of the coil is increased and the common mode choke coil with improved frequency characteristics can be realized.

Since the plate-shaped conductor of the second coil has a notch at the center thereof, the second coil can be integrally inserted and arranged inside the first coil. The length occupied by the coil with respect to the road direction is slightly longer than one coil. With this, although the inductance is slightly reduced, the number of turns can be easily increased, and a small-sized common mode choke coil compatible with a large current becomes possible.

(Embodiment) An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing a common mode choke coil according to the present invention. FIG. 2 is a perspective view showing a coil forming the common mode choke coil of the present invention.

As shown in FIG. 2, in the coil of the common mode choke coil of the present invention, a plate-shaped conductor having a large cross-sectional area is wound, and the conductor is formed into a substantially figure 8 shape and wound by reversing the same number of turns. The lead wire 6 is provided at both ends of the plate-shaped conductor, and the plate-shaped conductor having a substantially 8-shaped shape is used as the first coil 3. Inside the first coil 3, the shape and the number of turns are the same. A coil having a structure in which a second coil 4 having a small inner diameter having a notch 5 for engaging with the first coil 3 is inserted into the central portion of the plate-shaped conductor so as to be integrated. is there.

In the present embodiment, the plate-shaped conductor has a width of 30.
mm and a plate thickness of 3 mm were used.

As shown in FIG. 1, in the common mode choke coil of the present invention, a magnetic leg 2 of a split type closed magnetic circuit magnetic core 1 is inserted into a first coil 3 shown in FIG. Core 1
Facing each other and joining the joining surfaces of the magnetic legs 2 to form a closed magnetic circuit.

Since the second coil 4 is mounted inside the first coil 3 and arranged so as to be integrated, the length occupied by the coil in the magnetic path direction is one. It should be 1.3 times the length of the coil. Although the magnetic path length is long and the inductance is smaller than that of the conventional common mode choke coil, the same inductance can be easily obtained because a coil having an increased number of turns can be used.

The size of the common mode choke coil of the present invention is slightly larger than that of the common mode choke coil of 15 A.
When used for the above current, the conventional product cannot be used as it is, and one having a slightly larger size must be used, whereas the common mode choke coil of the present invention can be used as it is. The size of the common mode choke coil of the present invention is about 30 by volume ratio.
It becomes smaller by%.

By using the plate-shaped conductor of the present invention, the cross-sectional area of the conductor is increased, the direct current resistance can be reduced, and a large current can be dealt with. or,
Since the adhesion between the conductors was improved, the stray capacitance created by the coil was reduced, and the resonance frequency of the coil was increased, a common mode choke coil with improved frequency characteristics was obtained.

[0020]

According to the present invention, by forming the conductor wire into a plate shape, the cross-sectional area of the conductor is increased, the direct current resistance can be reduced, and a large current can be dealt with. Also, a small common mode choke coil with improved frequency characteristics can be obtained.

[Brief description of drawings]

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

FIG. 2 is a perspective view showing a coil of a common mode choke coil according to the present invention.

FIG. 3 is a perspective view showing a conventional common mode choke coil.

FIG. 4 is a perspective view showing a coil of a conventional common mode choke coil.

[Explanation of symbols]

 1,7 Split type closed magnetic circuit magnetic core 2,8 Magnetic leg 3,9 First coil 4,10 Second coil 5 Cut 6 Lead wire

Claims (1)

[Claims] 1. A surface-insulated linear conductor is wound, the conductor is further reversed by the same number of turns, and is wound into a figure eight shape, and both ends of the conductor are formed into lead wires, A transformer coil consisting of a large coil and a small coil, a small coil inserted inside the large coil, and a plurality of magnetic cores butted against each other. Two thin and flat coils with the same width as the length of the two coils. Using the plate-shaped conductor of, the plate-shaped conductor is wound, further reversed by the same number of turns and wound into a substantially 8-shape to form a first coil, and a lead wire is provided at the end. A cut for engaging the first coil is provided in the central portion of the plate-shaped conductor having the same number of turns, and a second coil having an inner diameter smaller than that of the first coil is provided in the first coil. Characterized by being inserted and arranged so as to be integrated inside Common mode choke coil.