JPH0897037A - Laminated electronic part - Google Patents

Abstract

PURPOSE: To provide a laminated electronic part which is capable of being lessened in length of a magnetic flux and enhanced in inductance by a method wherein the conductor of a coil is improved in arrangement. CONSTITUTION: A primary coil 12 and a secondary coil 13 are arranged side by side for the formation of a laminated-type electronic part, wherein the coils 12 and 13 are so constituted that the winding centers of coil conductors 12a and 13a are moved in a circumferential direction with the movement of the coil conductors 12a and 13a from their upper and lower positions to their vertical centers as the coil conductors 12a and 13a are wound around, and thus a magnetic flux that flows through the primary coil 12 and the secondary coil 13 is formed like a circle or nearly like a circle and lessened in length.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improved structure for arranging coil conductors of laminated electronic components such as laminated transformers and laminated inductors.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 7, there is known a laminated electronic component of this type, for example, a laminated transformer, which is disclosed in Japanese Patent Publication No. 22245/1987.

In this laminated transformer 1, one coil 3 of primary or secondary is arranged on the left side and the other coil 4 is arranged on the right side of the magnetic material 2 having a high magnetic permeability. As a result, a magnetic flux φ flowing vertically is formed across the left and right coils 3 and 4. The coils 3 and 4 are coil conductors 3
a, 4a are laminated, and a low μ material 5 such as a low permeability magnetic material, an insulator or a dielectric material is interposed between the coil conductors 3a and 4a that are vertically adjacent to each other. The small loop magnetic flux is not formed by the conductors 3a and 4a.

[0004]

By the way, in the above-mentioned conventional multilayer electronic component, the coil conductor 3 of each of the coils 3 and 4 is used.
7a and 4a are linearly superimposed on each other in the vertical direction, and the magnetic flux φ flows in a portion close to the coil conductors 3a and 4a.
As shown in, the flow of the magnetic flux φ has a rectangular shape.

On the other hand, the inductance value L is calculated by the following equation.

L = N ² (μ · s) / l Here, N is the number of turns, μ is the magnetic permeability, s is the cross-sectional area through which the magnetic flux penetrates, and 1 is the magnetic path length (the length of the magnetic flux).

Therefore, the shorter the length of the magnetic flux is, the larger the inductance value can be obtained. However, in the conventional laminated electronic component, the flow of the magnetic flux is quadrangular as described above. A long and large inductance value could not be obtained.

In view of the above-mentioned conventional problems, an object of the present invention is to provide a laminated electronic component in which the length of magnetic flux can be shortened and a large inductance value can be obtained by improving the arrangement of the coil conductors of each coil. To do.

[0009]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a primary coil and a secondary coil by stacking coil conductors vertically and extending over each coil. In the multilayer electronic component that flows a magnetic flux, the primary coil and the secondary coil are arranged side by side, and
The primary coil and the secondary coil are characterized in that the winding center of the coil conductor is moved in the circumferential direction as the winding goes from the coil conductors located above and below to the coil conductor located at the center in the vertical direction.

According to a second aspect of the present invention, there is provided a laminated electronic component in which a primary coil and a secondary coil are formed by vertically stacking coil conductors, and a magnetic flux is caused to flow across the coils. The secondary coils are arranged so as to face each other vertically, and one of the primary coil or the secondary coil located above the coil conductor is arranged as the coil conductor located above the coil conductor located below the coil conductor located above the coil conductor. The winding center of the coil conductor is moved in the circumferential direction, and the other coil positioned below moves in the circumferential direction of the winding center of the coil conductor as the coil conductor located at the lower part of the coil goes around to the coil conductor located at the upper part of the coil conductor. It is characterized by

According to a third aspect of the present invention, a primary coil and a secondary coil are formed by vertically stacking coil conductors, and a magnetic flux flows across each coil. One of the secondary coils is disposed inside the other, and the one coil has a winding diameter of the coil conductor that is reduced as the coil coil goes up and down from the coil conductors located at the upper and lower sides of the coil. The other coil is characterized in that the winding diameter of the coil conductor is increased as it goes around from the coil conductor located at the top and bottom to the coil conductor located at the center in the vertical direction.

According to a fourth aspect of the present invention, there is provided a laminated electronic component in which a primary coil and a secondary coil are formed by vertically stacking coil conductors, and a magnetic flux is caused to flow across the coils. A coiling pattern is formed by alternately superimposing the following coils, and the winding diameter of each coil is increased as the coil coil is wound from the coil conductors located above and below to the coil conductor located at the center in the vertical direction. Is characterized by.

According to a fifth aspect of the present invention, in a laminated electronic component in which coil conductors are vertically laminated to form a coil, and a magnetic flux is passed inside and outside the coil, the coil conductors are positioned above and below the coil conductors. It is characterized in that the winding diameter of the coil conductor is increased as the coil conductor is wound around the coil conductor located at the center in the vertical direction.

[0014]

According to the invention of claim 1, in the laminated electronic component in which the primary coil and the secondary coil are arranged side by side,
In each coil, the winding center of the coil conductor moves in the circumferential direction from the coil conductors located above and below to the coil conductor located at the center in the up-down direction, so that between the primary coil and the secondary coil. The magnetic flux flowing across the magnetic flux has a circular shape or a shape close to a circular shape, and the length of the magnetic flux becomes short.

According to the invention of claim 2, the primary coil and the secondary coil
In a multilayer electronic component in which the following coils are arranged facing each other in the vertical direction, the winding center is wound in the circumferential direction as the upper coil goes round toward the lower side and the lower coil goes round toward the upper side. Since the magnetic flux is moving, the magnetic flux penetrating between the upper and lower coils has a circular shape or a shape approximate to a circular shape, and the length of the magnetic flux becomes short.

According to the third aspect of the present invention, in the laminated electronic component in which the primary coil and the secondary coil are arranged in the inner and outer layers, the inner coil has a winding diameter reduced as it goes round toward the center in the vertical direction. , The outer coil has a larger winding diameter as it goes around the center in the vertical direction,
The magnetic flux flowing from the inner side of the inner coil to the outer side of the outer coil has a circular shape or a shape approximate to a circular shape, and the length of the magnetic flux becomes short.

According to the invention of claim 4, the primary coil and the second coil
Alternately superposed with the next coil to form a circular pattern,
In a so-called bifilar winding multilayer electronic component, each coil has a winding diameter that increases from the coil conductors located above and below to the coil conductor located at the center in the vertical direction. The magnetic flux flowing across the magnetic flux has a circular shape or a shape close to a circular shape, and the length of the magnetic flux becomes short.

According to the fifth aspect of the present invention, in the laminated electronic component, for example, a laminated inductor, in which a magnetic flux flows across the inside and outside of the coil, the coil conductor is located at the center in the vertical direction from the coil conductors located above and below the coil conductor. Since the winding diameter of the coil conductor is increased as it goes around the coil conductor,
The magnetic flux has a circular shape or a shape close to a circular shape, and the length of the magnetic flux becomes short.

[0019]

1 and 2 show a first embodiment of a laminated electronic component according to the present invention, for example, a laminated transformer. FIG. 1 is a sectional view of the laminated transformer, and FIG. 2 is a lamination process diagram of coil conductors. Is.

As shown in FIG. 1, this laminated transformer 10 is composed of a magnetic material 11 having a high magnetic permeability, inside which a primary coil 12 is arranged on the left side and a secondary coil 13 on the right side.
Has been arranged. Each of the coils 12 and 13 is constructed by laminating coil conductors 12a and 13a similarly to the conventional example, and a low μ material 14 is interposed between the coil conductors 12a and 13a as in the conventional example. Has been done.

The coil conductors 12a and 13a are arranged so that the center of the winding, that is, the center of the winding pattern overlapped by the coil conductors 12a and 13a, is located above and below the coil conductors 12a and 13a.
a, 13a and the coil conductors 12a, 13 in the center in the vertical direction
As it goes around a, it is moved in the circumferential direction. Such a change in the winding center is shown by a one-dot chain line in FIG.

FIG. 2 shows a method for forming the winding center as described above. In FIG. 2, white circles and black circles represent connection ends 12a1 and 13 of the coil conductors 12a and 13a.
a1 and the alternate long and short dash line indicates each of the connection ends 12a1,
13a1 shows the connection state.

That is, as shown in FIG. 2, the coil conductors 12a, 13a located at the upper part ((a) in FIG. 2) are wound around the coil conductors 12a, 13a ((f) in FIG. 2) at the center in the vertical direction. Then, the coil conductors 12a and 13a are printed so that the distance between the respective connection ends 12a1 and 13a1 is increased. On the other hand, the center coil conductors 12a and 13a in the vertical direction
The coil conductor 12a located below (from (g) of FIG. 2),
The coil conductors 12a and 13a are printed so that the distance between the respective connection ends 12a1 and 13a1 becomes smaller as it goes around 13a ((m) in FIG. 2). As a result, the winding center can be shifted as shown in FIG. In addition, this FIG.
Although not shown, when printing the coil conductors 12a and 13a, the low μ material 4 is applied every time the coil conductors 12a and 13a are printed.

Thus, the laminated transformer 1 according to this embodiment
According to 0, in the primary coil 12 and the secondary coil 13 arranged on the left and right as described above, the coil conductor 1 at the center in the vertical direction from the upper and lower coil conductors 12a and 13a.
As the winding center is formed to move in the circumferential direction as it goes around 2a and 13a, as shown in FIG.
The magnetic flux φ passing through each coil 12 and 13 has a circular shape or a shape close to a circular shape, and its length is obviously shorter than that of the conventional square magnetic flux.

In the first embodiment, the primary coil 12 is arranged on the left side and the secondary coil 13 is arranged on the right side, but they may be arranged in the reverse order.
Although the low μ material 14 is interposed between the coil conductors 12a and 13a, the same effect can be obtained in the laminated transformer in which the low μ material 14 is not interposed.

FIG. 3 shows a laminated transformer according to a second embodiment of the present invention. This laminated transformer 20 has a primary coil 22 in an upper part and a secondary coil 2 in a lower part in a magnetic body 21 thereof.
3 are arranged so as to face each other. In this embodiment, the winding center of the primary coil 22 is moved in the circumferential direction as shown by the alternate long and short dash line in FIG. 3 as the coil is wound from the upper coil conductor 22a to the lower coil conductor 22a. On the other hand, the winding center is also moved in the circumferential direction as shown by the alternate long and short dash line as the coil conductor 23a goes from the lower coil conductor 23a to the upper part of the secondary coil 23. Incidentally, each coil conductor 22 is similar to the first embodiment.
A low μ material 24 is interposed between a and 23a.

According to this embodiment, the magnetic flux φ passing through each coil 22 and 23 has a circular shape or a shape close to a circular shape as shown in FIG. 3, and the magnetic flux φ has a short length. .

In this embodiment, the primary coil 2 is provided on the top.
2, the secondary coils 23 are arranged in the lower part, but they may be arranged in reverse.

FIG. 4 shows a laminated transformer according to a third embodiment of the present invention. In this transformer 30, a primary coil 32 is arranged in the center of a magnetic body 31, while a secondary coil 33 is arranged. It is arranged around this primary coil 32. Here, the primary coil 32 has coil conductors 32a above and below it.
The winding diameter (distance in the radial direction of the winding) becomes smaller as the coil conductor 32a goes around from the center to the center in the vertical direction.
On the other hand, on the contrary, the coil conductor 33a of the secondary coil 32 has its winding diameter increased as it goes around the center. The coil conductors 32 are provided in the same manner as in the first embodiment.
A low μ material 34 is interposed between a and 33a.

As a result, from the inside of the primary coil 32, 2
As shown in FIG. 4, the magnetic flux φ flowing toward the outside of the next coil 33 has a circular shape or a shape close to a circular shape, and the magnetic flux φ has a short length.

In this embodiment, the primary coil 3 is placed inside.
2, the secondary coils 33 are arranged on the outer side, but they may be arranged in reverse.

FIG. 5 shows a laminated transformer according to a fourth embodiment of the present invention. This laminated transformer 40 is a bifilar winding in which primary coils 42 and secondary coils 43 are alternately laminated in a magnetic body 41. It was done. The coil conductor 42a of the primary coil 42 (shown by a solid line) and the coil conductor 43a of the secondary coil 43 (shown by a one-dot chain line) are separated from the coil conductor 42a above and below the coil conductor 4 at the center in the vertical direction.
The winding diameter is increased as it goes around 2a.

Also in this embodiment, as shown in FIG. 5, the magnetic flux φ exhibits a circular shape or a shape approximate to a circular shape.

FIG. 6 shows a fifth embodiment of the laminated electronic component according to the present invention.
In the above-mentioned embodiments, the laminated transformer is described, but in this embodiment, an example applied to a laminated inductor is shown. That is, in the laminated inductor 50, the coil conductor 51a is laminated inside the magnetic body 51 to form a winding pattern. The coil conductor 51a is located above and below the coil conductor 51a, as in the fourth embodiment. The winding diameter of the coil conductor 51a is increased as it goes around the coil conductor 51a in the vertical direction.

Also in this embodiment, as shown in FIG. 6, the magnetic flux φ exhibits a circular shape or a shape approximate to a circular shape.

[0036]

As described above, according to the inventions of claims 1 to 5, the magnetic flux has a circular shape or a shape close to a circular shape, the length of the magnetic flux becomes short, and a large inductance value is obtained. Can be obtained.

[Brief description of drawings]

FIG. 1 is a sectional view of a laminated transformer according to a first embodiment.

[Fig. 2] Stacking process diagram of coil conductors

FIG. 3 is a sectional view of a laminated transformer according to a second embodiment.

FIG. 4 is a sectional view of a laminated transformer according to a third embodiment.

FIG. 5 is a sectional view of a laminated transformer according to a fourth embodiment.

FIG. 6 is a sectional view of a laminated inductor according to a fifth embodiment.

FIG. 7 is a sectional view of a conventional laminated transformer.

[Explanation of symbols]

10, 20, 30, 40 ... Multilayer transformer, 12, 22,
32, 42 ... Primary coil, 13, 23, 33, 43 ... 2
Next coil, 12a, 13a, 22a, 23a, 32a,
33a, 42a, 43a, 51a ... Coil conductor, 50 ...
Multilayer inductor, φ ... magnetic flux.

Claims (5)

[Claims] 1. A laminated electronic component in which a primary coil and a secondary coil are formed by vertically stacking coil conductors, and a magnetic flux is caused to flow across each coil. And the primary coil and the secondary coil move in the circumferential direction of the winding center of the coil conductor as the primary coil and the secondary coil circulate from the upper and lower coil conductors to the central coil conductor in the vertical direction. A laminated electronic component characterized by the above. 2. A laminated electronic component in which a primary coil and a secondary coil are formed by vertically stacking coil conductors, and a magnetic flux is flowed across each coil, wherein the primary coil and the secondary coil are vertically stacked. One of the primary coil and the secondary coil located above the coil conductor is disposed so as to face each other, and the winding coil center of the coil conductor is circulated from the coil conductor positioned above to the coil conductor positioned below. The other coil, which is moved in the direction, and is positioned below, moves in the circumferential direction around the winding center of the coil conductor as it goes around from the coil conductor located at the lower part to the coil conductor located at the upper part. Multi-layer electronic component. 3. A laminated electronic component in which a primary coil and a secondary coil are formed by vertically stacking coil conductors, and a magnetic flux is flowed across each coil, one of the primary coil or the secondary coil. Is arranged inside the other, and the one coil is configured such that the winding diameter of the coil conductor is reduced as the coil conductor is positioned from above and below to the coil conductor located at the center in the vertical direction,
A laminated electronic component, wherein the other coil has a winding diameter of the coil conductor increased as the coil coil goes up and down from the coil conductor located at the top and bottom to the coil conductor located at the center in the up-down direction. 4. A laminated electronic component in which a primary coil and a secondary coil are formed by vertically stacking coil conductors, and a magnetic flux is caused to flow across each coil, wherein the primary coil and the secondary coil are alternated. And a winding pattern of the coil conductors is formed so as to overlap with each other to form a winding pattern, and the winding diameters of the coil conductors are increased as the coils are wound from the coil conductors located above and below to the coil conductor located at the center in the vertical direction. Mold electronic components. 5. A laminated electronic component in which coil conductors are vertically laminated to form a coil that circulates, and a magnetic flux flows through the inside and outside of the coil, wherein the coil conductors are vertically arranged above and below the coil conductors. A laminated electronic component in which the winding diameter of the coil conductor is increased as the coil conductor is wound around the coil conductor located at the center of the direction.