JPS5943689Y2 - laminated transformer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a laminated transformer, and particularly to a laminated transformer structure that is simple and easy to manufacture.

A conventional transformer consists of a magnetic core having an EI type, an E type, an E/Y shape, etc., and an insulated conductor wire wound around any leg of the core to form two or more coils.

However, the transformer of this type requires a complicated winding process, and the manufactured transformer also has problems such as being large in size.

The inventors of the present invention have provided a transformer based on a laminated method in Japanese Patent Application No. 54-127899 and Japanese Unexamined Patent Publication No. 56-051810 as an excellent transformer free from this problem.

In this method, a magnetic layer (magnetic ferrite with electrical insulation properties, etc.) or a non-magnetic insulator layer (5ioz, Al2O
3 grade porcelain) and two or more conductive patterns for coil formation were alternately printed and laminated to form a transformer including two or more coils as a whole.

However, in order to form two or more coils, printing a conductive pattern, a magnetic layer, or an insulating layer requires preparing a large number of printing plates with fairly complex shapes and using them alternately. Ta.

The present invention aims to further improve the structure of the laminated transformer described above, and makes it possible to efficiently manufacture the laminated transformer with the simplest possible structure.

In particular, in the present invention, two or more coil-forming conductive patterns are separated by the same square insulating layer, and by having through holes corresponding to the number of conductive patterns, it is possible to obtain a pie filer-wound laminated coil. can.

Embodiments of the present invention will be described in detail below with reference to the drawings.

The insulating layer is preferably made by spreading or printing a paste of magnetic ferrite powder dispersed in a binder such as butyral resin into a thin sheet, printing another layer on top of that, and then forming an insulating layer. The conductor is printed using a metal powder, preferably a heat-resistant metal powder (Pd, Pd-
It is formed by printing a paste of Ag, etc.).

1 to 10 show manufacturing process diagrams of the pie filer-wound laminated transformer of the present invention.

As shown in FIG. 1, first, a magnetic layer 1 is printed, then a conductor 2 having a lead-out part a near the top side is printed, and as shown in FIG. 2, one end of the conductor 2 is exposed and the magnetic layer 3 is printed. The L-shaped conductor 4 connected to the conductor 2 as shown in FIG. Hole 6 exposing the end of 4
and a magnetic layer 8 having a hole 7 that exposes the end of the conductor 5.
print.

As shown in Figure 5, lower conductors 4, 5 are inserted through these holes.
6. Print conductors 9 and 10 for phantom connection, respectively, and then drill holes 11 and 12 to expose the ends of the conductors 9 and 10 as shown in FIG.
A magnetic layer 13 having the following properties is printed on the entire surface.

This lamination can be carried out any number of times, mutatis mutandis, if desired.

At this time, the basic shape of the magnetic layer can be reduced to a small number, and the same applies to small conductors.

As shown in FIG. 7, a conductor 14 (having a lead-out portion) connected to the conductor 9 and a conductor 15 connected to the conductor 10 are applied.

It can be seen from the above that one coil extending from the lead-out portions a to b is formed.

Next, as shown in FIG. 8, the magnetic layer 1 is
6 is printed on the left side, and then, as shown in FIG. 9, an inverted U-shaped conductor 17 that is connected to the conductor 15 and has a lead-out portion d on the left side of the laminate is printed, and then a magnetic layer 18 is printed on the entire surface. After completing the lamination by printing and firing this laminated body in a firing furnace, external terminals a', b'e C'e d' are connected to the drawer parts a*b#c-d as shown in Fig. 10. □; is baked to complete the laminated transformer of the present invention.

The equivalent circuit is shown in FIG.

The steps shown in Figures 4 to 7 are repeated a predetermined number of times, but the position of the through-hole in the insulator layer is the same for each layer (aside from the orientation), which greatly simplifies the lamination process. Ghru.

Further, the present laminated transformer is a pie filer type transformer in which two sets of coils are wound simultaneously, and can be easily obtained by utilizing the structure of the insulating layer described above.

In addition, since the laminated transformer of the present invention is a chip type, direct soldering or automatic soldering is possible, and it has many advantages such as having a compact and monolithic structure.

[Brief explanation of drawings]

1 to 10 are plan views showing the sequential steps of manufacturing the pie filer type laminated transformer of the present invention, and FIG. 11 is an equivalent circuit diagram of the laminated transformer of the present invention. The upper part of the figure is as follows. 1.2, 8.13.1
6.18: Magnetic layer, 2°4.9.14: Conductor for first coil, s, io. 15.17: Conductor for second coil, a s b # e
sd: Drawer part, a' * b' e C' * d'
: External terminal.

Claims (1)

[Scope of utility model registration request] In a multilayer transformer formed by alternately laminating insulator layers and at least two sets of conductor patterns for forming a coil, one or more of the insulator layers interposed between the conductor patterns has at least two through holes. A laminated transformer characterized by a pie filer winding, through which the at least two sets of conductor patterns are respectively connected.