JP2522318B2 - Transformer - Google Patents

Description

TECHNICAL FIELD The present invention relates to a transformer.

(Prior Art and Problems) Conventionally, a transformer is composed of a magnetic core and a copper wire wound around the magnetic core, which requires a relatively large volume among electronic components and is extremely difficult to integrate. there were. In addition, JP-A-62
A winding type integrated transformer is also proposed as in Japanese Patent Publication No. 88354, but it is difficult to maintain a constant spacing between the primary and secondary conductors, and there is a limit to increasing the magnetic path area. Yes It was difficult to improve the coupling efficiency.

(Object of the Invention) An object of the present invention is to solve the above problems and to adopt a transformer which can be integrated and improve the coupling efficiency by adopting a completely different structure from the conventional transformer. To provide.

(Means for Solving the Problems) In order to achieve the above object, the present invention covers the first and second conductor layers juxtaposed with each other with an insulating layer and surrounds the outer periphery of the insulating layer with a magnetic layer. The gist of the present invention is a transformer in which an enclosure and a first side and a second side of the first and second conductor layers, which are arranged side by side, are respectively set as a primary side and a secondary side.

(Operation) When a voltage is applied to the primary side, a current flows in the first conductor layer, a magnetic flux is formed in the magnetic layer, and a voltage is generated in the second conductor layer due to the mutual induction action and is output to the secondary side. It

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

As shown in FIG. 1, a first magnetic layer 2 is formed on a substrate 1 made of SiO ₂ or a polyimide-based insulating material (PIQ) in a substantially M-shape in a plane, and the first magnetic layer 2 is formed. First on top
Insulator layer 3 is laminated. The first conductor layer 4 is laminated on the first insulator layer 3, and the second insulator layer 5 is laminated on the upper surface and both sides of the first conductor layer 4.

A second conductor layer 6 is laminated on the upper surface of the second insulator layer 5, and a third insulator layer 7 is laminated on the upper surface and both sides of the second conductor layer 6. The upper surface of the third insulator layer 7 and both sides of the first, second and third insulator layers 3, 5, 7 are second
Of the magnetic material layer 8 and is connected to the first magnetic material layer 2.

Therefore, in the cross section of the transformer of this embodiment extending in a substantially M shape in a plane, the first and second conductor layers 4 and 6 arranged in parallel are arranged.
Are covered with the first, second and third insulator layers 3, 5, 7 respectively, and the outer circumference (entire circumference) of the insulator layers 3, 5, 7 is the first.
It is surrounded by the first and second magnetic layers 2 and 8.

Al, Cu, Au, etc. are used for the first and second conductor layers 4, 6. The first and second magnetic layers 2, 8 are made of Ni-Fe, Ni-
Permalloy such as Co, ferrite, amorphous or the like is used. Further, lamination of these layers is performed by vacuum vapor deposition, sputtering or the like.

The primary side is defined by the ends 4a, 4b of the first conductor layer 4 extending in a substantially M-shape on the plane, and the secondary side is defined by the ends 6a, 6b of the second conductor layer 6. When an alternating current or a pulse is applied to (between both ends 4a, 4b of the first conductor layer 4), the magnetic flux in the first and second magnetic material layers 2, 8 changes and the second conductor layer is induced by mutual induction. An electromotive force is generated between both ends 6a, 6b of 6. That is, as shown in FIG. 2, when the current I ₀ flows through the first conductor layer 4, the magnetic flux Φ flows through the first and second magnetic layers 2, 8.
Changes occur. As a result, both ends 6a, 6 of the second conductor layer 6 are
A voltage is generated between points b and is output to the secondary side.

At this time, the magnetic path is closed, and the leakage magnetic flux can be reduced. Further, when the magnetic flux passes through the magnetic core having the cross-sectional area S, the magnetic path length L and the magnetic permeability μ, the magnetic resistance is R = L / μS, and in the case of the present embodiment, the width Wa shown in FIG. The length is a substantially M-shaped total length Ha, and its cross-sectional area Sa (= Wa · Ha) can be increased by increasing the width Wa or by increasing the total length Ha. . Furthermore, the length of the magnetic path is one round of the first and second magnetic layers 2 and 8 (La in FIG. 2) and can be shortened. That is, since the magnetic path length La can be reduced and the cross-sectional area Sa (= Wa · Ha) can be increased, the magnetic resistance Ra (= La / μSa) can be reduced and the first conductor layer 4 The degree of coupling between both ends 4a and 4b and both ends 6a and 6b of the second conductor layer 6 can be improved.

In addition, since it is a thin film transformer, it can be integrated in an IC. Further, in the conventional winding type transformer, it was difficult to keep the distance between the primary side and secondary side conductors constant, but in the present embodiment, the first conductor layer 4 and the second conductor layer 4
The space between the conductor layer 6 and the conductor layer 6 can be made equal at any place, and the coupling efficiency can be improved.

The present invention is not limited to the above-mentioned embodiment, but the winding ratio in the conventional transformer may be changed as shown in FIG. 3, for example. This is one in which the conductor layer 9 is the primary side and the conductor layers 10 and 11 are in series and are the secondary side. This case corresponds to a turns ratio of 1: 2 in the conventional transformer.

Also, FIG. 4 corresponds to a winding ratio of 1: 1 as in the first embodiment, and the conductor layers 12 and 13 are arranged in parallel on the same plane, thereby eliminating the need for a multilayer conductor.

EFFECTS OF THE INVENTION As described in detail above, according to the present invention, by adopting a structure that is completely different from that of the conventional transformer, it is possible to achieve an excellent effect that it can be integrated and the coupling efficiency can be improved.

[Brief description of drawings]

FIG. 1 is a perspective view showing a transformer embodying the present invention, FIG. 2 is a view showing a main part of the transformer, FIG. 3 is a sectional view of a transformer showing another example, and FIG. It is sectional drawing of the transformer of another example. 2 is a first magnetic layer, 3 is a first insulator layer, 4 is a first conductor layer, 5 is a second insulator layer, 6 is a second conductor layer, and 7 is a third insulator. Layer, 8 is the second magnetic layer, 9 is a conductor layer, 10
Is a conductor layer, 11 is a conductor layer, 12 is a conductor layer, and 13 is a conductor layer.

Front Page Continuation (72) Inventor Ichiro Izawa 1-1 Showa-cho, Kariya Aichi Prefecture, Japan Denso Co., Ltd. (72) Inventor Toshikazu Arasa 1-1-Showa-cho Kariya, Aichi Prefecture Nippon Denso Co., Ltd. (72 ) Inventor Hiroshi Sakurai, 1-1, Showa-cho, Kariya city, Aichi Japan Denso Co., Ltd. (56) Reference JP-A-63-110767 (JP, A)

Claims (1)

(57) [Claims] 1. A first conductor layer and a second conductor layer, which are arranged in parallel, are covered with an insulating layer, and the outer circumferences of the insulating layers are surrounded by a magnetic material layer. A transformer having a primary side and a secondary side between both ends.