JPH0346207A - Inductor - Google Patents

Abstract

PURPOSE:To make it possible to increase the self-resonance frequency of the title inductor by reducing its line-to-line capacity by a method wherein linear magnetic materials, formed by bending magnetic materials, are constituted in mesh-like form, and they are excited almost orthogonally intersecting with the magnetic material from the two directions crossing at right angle with an excitation inductor. CONSTITUTION:Paired magnetic cores, which are formed by facing two by two of bent magnetic materials 11 are arranged in a plurality of pairs in array form, magnetic cores 12 are constituted in reticular form, and an excitation conductor 13 is orthogonally intersected with the magnetic materials 11 from two directions about in the center of the virtual circle of the magnetic materials 11. The points of intersection of the magnetic materials 11 and the excitation conductor 13 approach to a high degree, and the magnetic flux excited at each point of intersection is coupled intensely with the excitation conductor 13 on the adjacent point of intersection. Also, the adjacent magnetic materials 11 are excited in the opposite direction, and as they constitute a semi-closed magnetic circuit, a demagnetizing field is small. Besides, as the half of the whole winding of the escitation conductor 13 is crossed at right angle with each other, the opposing area between the excitation conductor 13 is small, and accordingly, their capacitance is small. As a result, self-resonance frequency can be enhanced, and the accomplishment of high frequency of inductance can also be achieved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to improving the characteristics of inductors used at high frequencies.

[Prior Art] FIG. 3 is a schematic diagram showing a conventional high frequency inductor, which is described in, for example, Japanese Patent Application Laid-Open No. 61-219114.

In the figure, 1 is a magnetic material, 2 is a magnetic core made of a plurality of magnetic materials, and 3 is an excitation conductor.

In the figure, an insulating layer for insulating the magnetic body 1 and the excitation conductor 3 from each other, and a support made of a substrate, a molding material, etc. for supporting them are omitted for the sake of clarity. .

Next, the operation will be explained. This inductor is a magnetic material 1
It has a hand-woven structure with the excitation conductor 3 as the warp and the excitation conductor 3 as the weft. Therefore, when a current is passed through the excitation conductor 3, magnetic fluxes in mutually opposite directions are excited in the adjacent magnetic bodies 1, for example, as shown by arrows.

As a result, the leakage magnetic flux from the tip of the magnetic core 2 immediately flows into the adjacent magnetic body 1, and as a result, a quasi-closed magnetic path is formed. Therefore, the demagnetizing field is small, and a small inductor with large inductance can be obtained.

[Problem to be Solved by the Invention J] Since the conventional inductor uses the linear magnetic body 1 as described above, the excitation conductor 3 is orthogonal to the magnetic body 1 and the excitation conductors are arranged almost parallel to each other, so that the excitation conductor 3 The capacitance between them increases. For this reason, the self-resonance frequency, which is the parallel resonance of the inductance and capacitance, becomes low, and the upper limit frequency for use of the inductor is reduced, which limits the ability to increase the frequency.

This invention was made to solve the above-mentioned problems, and aims to reduce the line capacitance, increase the self-resonant frequency, and increase the frequency of the inductor.

[Means and effects for solving the problems] An inductor according to the present invention includes a magnetic material, an excitation conductor, an insulating layer for mutually insulating the magnetic material and the excitation conductor, and a support for supporting them. ,
The above-mentioned magnetic body is constituted by a plurality of bent linear magnetic bodies in a mesh shape, and the above-mentioned excitation conductor is excited from two orthogonal directions substantially perpendicular to the above-mentioned magnetic body, and the excitation conductor and the magnetic By bringing each intersection point with the body very close and by exciting adjacent magnetic bodies in opposite directions,
In addition to reducing the demagnetizing field to obtain a large inductance with a small size, half of the excitation conductors are orthogonal to each other to reduce line capacitance, thereby increasing the self-resonant frequency and increasing the frequency of the inductor.

[Example] Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, 11 is a bent magnetic body, 12 is a mesh-like magnetic core composed of the magnetic body 11, and 13 is an excitation conductor. In addition, in the figure, an insulating layer for insulating the magnetic body 11 and the excitation conductor 13 from each other, and supports such as a substrate and a molding material for supporting these components are omitted for convenience of explanation. .

Further, the magnetic body 11 and the excitation conductor 13 may be wires or thin film strips.

In this embodiment, the bent portion of the magnetic body 11 has a semicircular arc shape, and two bent magnetic bodies 11 are used in pairs, facing each other so that the bent portion has a circular shape. A plurality of pairs of these paired magnetic cores are arranged in an array, and the magnetic core 12
It has a mesh-like shape. This opposing magnetic body 11
When the excitation conductor 13 is orthogonal to the center of the virtual circle formed by the semicircular arc shape, the excitation conductor 13 also intersects at right angles to the magnetic body 11 . Furthermore, the intersections between the magnetic body 11 and the excitation conductor 13 are very close to each other, and the magnetic flux excited at each intersection is strongly coupled to the excitation conductor 13 at an adjacent intersection. Furthermore, the bent magnetic bodies 11 are elongated in the direction in which they are excited, and like the conventional inductor shown in FIG. 3, adjacent magnetic bodies 11 are excited in opposite directions, forming a quasi-closed magnetic circuit. Therefore, the demagnetizing field is also small. Next, regarding the capacitance between the excitation conductors 13, since the excitation conductors 13 of the inductor according to this embodiment have half of all windings orthogonal to each other, the excitation conductors 13
Compared to the case of a conventional inductor in which all the windings of the excitation conductor 11 are substantially parallel, the opposing area between the excitation conductors 11 is small, and therefore the capacitance is also small.

In the above embodiment, the bent portion of the magnetic body 11 has a semicircular arc shape, but the shape of the bent portion is not limited to this, and may be a dogleg shape. Furthermore, as is clear from the flow of magnetic flux in the magnetic body 11,
Magnetic body 11 in which annular magnetic bodies are linked as shown in FIG.
A mesh-like magnetic core] 2 may also be used.

In the above embodiments, the magnetic material constituting the mesh core can be formed of a single layer or a laminated thin film.

[Effects of the Invention] As described above, according to the present invention, the demagnetizing field can be reduced by bringing the intersections of the excitation conductor and the magnetic body extremely close together and by exciting the adjacent magnetic bodies in opposite directions. In addition to obtaining a small size and large inductance, by making half of the entire excitation conductors orthogonal to each other and reducing line capacitance, it is possible to increase the self-resonant frequency and achieve a high frequency inductor.

[Brief Description of the Drawings] Fig. 1 is a schematic diagram of an inductor according to an embodiment of the present invention, Fig. 2 is a schematic diagram of an inductor showing another embodiment of the invention, and Fig. 3 is a conventional inductor. It is a schematic diagram. 11...Magnetic material, 12...Magnetic core, 13...Excitation conductor.

Claims (2)

[Claims] (1) In an inductor consisting of a magnetic material, an excitation conductor, an insulating layer for mutually insulating the magnetic material and the excitation conductor, and a support for supporting them, the magnetic material is formed by a plurality of bent linear magnetic materials. An inductor characterized in that it is configured in a mesh shape and that the excitation conductor is excited from two orthogonal directions substantially perpendicular to the magnetic body. (2) The inductor according to claim 1, wherein the mesh-like magnetic material is a single layer or a laminated thin film.