JPH09232155A - Inductance element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inductance element capable of thinning the thickness and dealing with a large current. SOLUTION: This inductance element is composed of a bobbinless coil 1 made up of flat type copper wire and a core consisting of E-shaped cores 2, 3, and a terminal holder 4 made up of resin. Here the lead wires 1a of the bobbinless coil 1 pass through leading-out holes 4a provided in the terminal holder 4, and are bent on the external surface of the terminal holder 4, and are wired to the bottom surface of the terminal holder 4, and the ends of the leads 1a are fixed so as to adhere to the bottom surface of the terminal holder 4 closely to become surface mounting terminals.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a choke coil used for a switching power supply or the like.

[0002]

2. Description of the Related Art A conventional inductance element will be described with reference to the drawings. FIG. 8 shows a coil of a conventional inductance element. FIG. 9 shows a coil of another conventional inductance element. The structure of the conventional inductance element is
A one-turn coil 51 is manufactured by a method in which a coil obtained by winding a copper wire around a bobbin made of resin or the like and a magnetic core are combined, or a thin strip conductor such as a copper plate is punched or the like as shown in FIG. A method of constructing an inductance element by combining a plurality of one-turn coils 51 into a coil of several turns or dozens of turns, or by bending a conductor such as a continuous copper plate as shown in FIG. There has been a method of forming a coil by processing and combining it with a magnetic core to form an inductance element.

Further, in response to the demand for a swing choke having an L-shaped or linearly decreasing inductance with respect to a DC current, the middle leg of the magnetic core is conventionally processed into a T-shaped or L-shaped. I made a swing choke.

[0004]

SUMMARY OF THE INVENTION In the conventional configuration,
It is difficult to reduce the thickness of the inductance element using the bobbin due to the thickness of the bobbin for insulation. Also,
The coil configured by combining the one-turn coils shown in FIG. 8 can be thinned as an inductance element. However, in the combination of one-turn coil and another one-turn coil, connection of the coil-to-coil connecting portion 52 is performed. Since resistance is generated, the DC resistance of the coil increases, which is a problem. Further, in the structure shown in FIG. 9 in which a thin conductor such as a copper plate is bent to form a coil, the bent portions 61 of the conductors are overlapped with each other, so that the coil becomes thick.

Further, when manufacturing a swing choke,
Swing characteristics can be achieved by processing the magnetic core,
To process the middle leg of the magnetic core into a T-shape or L-shape,
A special cutting machine etc. was required, and processing precision was required. INDUSTRIAL APPLICABILITY The present invention provides an inductance element which can be thinned and whose current capacity can be increased, does not require special processing of the magnetic core, can be easily processed into a coil terminal, and can be easily mounted on a mounting board. is there.

[0006]

DISCLOSURE OF THE INVENTION According to the present invention, a coil in which a wide flat plane of a rectangular copper wire is substantially perpendicular to the winding axis direction, and a magnetic core made of a magnetic material whose central leg is substantially circular are provided. In the magnetic component formed by combining, the winding start and winding end leads of the coil are bent along the outer surface of the terminal block through the lead-out holes formed in the terminal block, and are led to the bottom surface of the terminal block. It becomes a board mounting terminal. In addition, the terminal block is an inductance element composed of ferrite with a specific resistance of 100 kΩ · m or more.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The inductance element of the present invention
By winding the wide flat surface of the flat copper wire almost at right angles to the winding axis direction, it becomes easy to reduce the thickness of the coil, and the wound flat copper wire forming the coil is used as a coil. Since the shape can be retained without the bobbin, a coil without a bobbin can be manufactured, and the space factor of the coil can be improved by the thickness of the bobbin, thus reducing the size and thickness and increasing the allowable current. Can be planned.
In addition, the terminal block made of insulating resin is provided with the above-mentioned hole for drawing out the coil to serve as a hole for leading out the lead at the beginning and end of winding of the coil, and the lead passing through the hole is bent along the outer surface of the terminal block. The terminal end is arranged on the bottom surface of the terminal block and serves as a terminal for mounting on the board.

The terminal block uses a ferrite having a specific resistance of 100 kΩ · m or more to maintain the insulation between the winding start and winding ends of the coil which is the terminal, and at the time of low current, the terminal made of the ferrite. The stand serves as a magnetic core forming a closed magnetic circuit, and the coil serves as a through coil having substantially two turns, and has a high inductance. In addition, since the wound coil has a gap in the middle leg of the magnetic core, the magnetic core is not saturated with a relatively large current, and an inductance can be generated, so that an inductance having a swing characteristic with respect to a current can be obtained. It is possible.

[0009]

Embodiments of the inductance element according to the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of a component structure of an embodiment of an inductance element of the present invention. FIG. 2 is a perspective view of another embodiment of the inductance element of the present invention.
FIG. 3 shows a DC superimposition characteristic diagram of another embodiment of the inductance element of the present invention.

As shown in FIG. 1, the inductance element of the present invention has a bobbinless coil 1 made of a rectangular copper wire, a magnetic core made of an E type core 2 and an E type core 3 made of a magnetic material, and a lead lead-out hole 4a. The terminal block 4 is made of the heat-resistant resin. Bobbinless coil 1 lead wire 1
The a passes through the lead-out hole 4a formed in the terminal block 4, is bent at the outer surface of the terminal block 4, and is wired to the bottom surface of the terminal block 4. The terminal end of the lead 1a led to the bottom surface of the terminal block 4 is fixed so as to be in close contact with the bottom surface of the terminal block 4, and serves as an optimum terminal for surface mounting.

FIG. 2 shows an embodiment of the inductance element of the present invention in which a ferrite having a specific resistance of 100 kΩ · m or more is used as a terminal block. The direct current superposition characteristic of the inductance element of the present invention shown in FIG. 2 has an L-shaped curve with respect to direct current as shown in FIG. FIG.
6 and 6 are diagrams simply expressing the function of the inductance element according to the present invention shown in FIG. 2, and FIGS. 5 and 7 are DC superposition characteristic diagrams of FIGS. 4 and 6. When the direct current flowing through the coil in FIG. 2 is small, a magnetic flux 27 having a magnetic core formed by the E-shaped cores 22 and 23 having a gap 24 in the middle leg of the magnetic core as a magnetic path is also generated, but the magnetic flux larger than the magnetic flux 27 is generated. 25 is generated in the terminal block 24 made of ferrite and has an inductance larger than that of the magnetic flux 27 having the E-shaped cores 22 and 23 as magnetic cores.
FIG. 2 can be simply represented as FIG. FIG. 4
As shown in FIG. 5, the DC superposition characteristic of can have a high inductance with respect to a low current, but since the magnetic core is a closed magnetic circuit, the inductance sharply decreases with respect to the current. In addition, when a relatively large current flows, the magnetic flux 25 of the terminal block 24 made of ferrite as described above is saturated, so that no inductance can be generated, and thereafter, the gap 26 is formed as shown in FIG. The inductance of FIG. 7 is generated by the magnetic flux 27 generated by the coil 21 wound around the applied middle leg. That is, it is possible to manufacture an inductance element having an L-shaped direct current superposition characteristic, which has a high inductance at a low current and can generate an inductance even for a relatively large current.

[0012]

As described above, according to the present invention, since the coil forming the inductance element can reduce the bobbinless and the direct current resistance, it is easy to make the inductance element thin and increase the current of the coil. To do. Further, the terminal located on the bottom surface of the terminal block is composed of a planar conductor and has a structure suitable for a mounting board. Further, since no special processing of the core is required, it is possible to reduce the man-hours for processing the core and provide an inexpensive swing choke coil.

[Brief description of drawings]

FIG. 1 is a perspective view of a fixture configuration of an embodiment of an inductance element of the present invention.

FIG. 2 is a perspective view of another embodiment of the inductance element of the present invention.

FIG. 3 is a DC superimposition characteristic diagram of another embodiment of the inductance element of the present invention.

FIG. 4 is a diagram simply showing the function of another embodiment of the inductance element of the present invention at a low current.

FIG. 5 is a DC superposition characteristic diagram of FIG.

FIG. 6 is a diagram simply showing the function of another embodiment of the inductance element of the present invention when a relatively large current is applied.

FIG. 7 shows the DC superposition characteristics of FIG.

FIG. 8 is a plan view of a part view and a completed view of a coil used in a conventional inductance element.

FIG. 9 is a plan view of a part view and a completed view of a coil used in another conventional inductance element.

[Explanation of symbols]

 1 bobbinless coil 1a lead 2 E type core 3 E type core 4 terminal block 4a hole for leading out 11a lead 12 E type core 13 E type core 14 terminal block 21 coil 22 E type core 23 E type core 24 terminal block 25 magnetic flux 26 Gap 27 Magnetic Flux 51 1 Turn Coil 52 Connection Part 61 Overlapping Part

Claims (2)

[Claims] 1. A magnetic component comprising a coil wound in such a manner that a wide flat plane of a rectangular copper wire is substantially perpendicular to a winding axis direction, and a magnetic core made of a magnetic material whose central leg is substantially circular. Leads at the beginning and end of winding of the coil are bent along the outer surface of the terminal block through the lead-out holes formed in the terminal block, and lead out to the bottom surface of the terminal block to serve as board-mounted terminals. And an inductance element. 2. The inductance element according to claim 1, wherein the terminal block is made of ferrite having a specific resistance of 100 kΩ · m or more.