JP2555746B2 - Transformer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a transformer.

[Conventional technology]

Conventionally, a transformer shown in FIG. 2 is known as an apparatus of this type.

FIG. 2 is a perspective view showing a conventional transformer, in which 1 is a toroidal core formed by forming a ribbon of an amorphous alloy and 2 is a winding wound around the toroidal core 1. is there. The core 1 on which the ribbon of the amorphous alloy is formed is mostly toroidal as shown in FIG.

A rectangular core 1 as shown in FIG. 3 is also used. While winding the winding 2 around the molded core 1,
In general, the core 1 is wound evenly.

[Problems to be Solved by the Invention]

However, in the transformer T, since the toroidal core is laid sideways and mounted as shown in FIG. 4 in order to make the electronic device thinner, the primary winding 11,
It is said that the secondary winding 12, the substrate 3 and the core 1 are sandwiched between them, which makes positioning and surface mounting difficult at the time of mounting, and a pedestal for supporting the core 1 may be required. There was a problem.

The present invention has been made in order to solve such a problem, in which two opposing flat portions are connected to each other by rounded corner portions to form a flat track end face, and a winding is provided only on one flat portion. The purpose is to obtain a transformer whose mounting surface is horizontal, thin, and easy to be surface mounted.

[Means for solving the problem]

A transformer according to the present invention includes a core having plate-shaped first flat portions and second flat portions facing each other in parallel and a corner portion connecting these two flat portions, and only the first flat portion. A winding is wound around the wire, and the end of the winding is arranged in the vicinity of the second flat portion so that the second flat portion can be surface-mounted on the substrate with the mounting surface as the mounting surface.

[Action]

The transformer according to the present invention is formed by connecting flat portions facing each other with rounded corners to form a flat track end face, and winding the flat portion on one side to thin the transformer. Work to make the surface flat.

〔Example〕

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

FIG. 1 is a perspective view showing a transformer according to an embodiment of the present invention. The same or corresponding components as those of the conventional example shown in FIGS. 2 to 4 are designated by the same reference numerals and the description thereof is omitted.

In FIG. 1, reference numeral 21 denotes a core, and in this embodiment, a case where this core is a core manufactured by molding a ribbon made of an amorphous alloy will be described as an example. This core 21
Is formed by connecting two parallel plate-like flat portions F, F parallel to each other with rounded corner portions C, C to form a flat track shape in the side end face. 2a is the tip of the winding 2.

Of the two facing flat portions F, F, only the flat portion on one side is used as the winding surface 22 for winding the core 21, and the winding surface 22 of the core 21 has the primary winding. 24 and the secondary winding 25 are provided, the end of the winding is provided on the other flat portion side, and the other flat portion F serves as the mounting surface 23 of the core 21 on the substrate 3.

In the above structure, the core 21 has two opposed flat portions F,
F is connected by rounded corners C and C, and the end face is a flat track type, and the primary winding 24 and the secondary winding 25 are applied only to the winding surface 22 of the core which is one flat portion F, The transformer T can be assembled by setting the other flat portion F as the mounting surface 23 of the core.

The core 21 can be made flat as compared with a toroidal core having the same effective cross-sectional area and effective magnetic path length, and when mounted on the substrate 3, the width is wide but the height is low. Corners with rounded flat parts F, F, which are flat surfaces
It is connected by C and C, the end face is track-shaped, and the winding is applied to one flat portion F, so the other flat portion F is the mounting surface, and the tip 2a of the winding 2 can be surface-mounted. Can be processed as.

According to one embodiment of the present invention, the core 21 connects two opposing flat portions F, F with rounded corner portions C, C to form a track shape having a flat end surface, and the winding 2 is provided on one side of the flat portion F. The core of
By winding only on the winding surface 22 of the transformer 21, the transformer T is thin, the mounting surface 23 is flat, and the tip portion 2a of the winding 2 is thin as a whole so that it can be surface-mounted. There is an effect that is.

(Other Examples) In the above-described one example, the case where the core, which is a magnetic component formed by molding an amorphous alloy, is used in the transformer has been described, but another magnetic material is used and a ring-shaped shape is used. Of course, the same effect can be obtained with a flat shape.

〔The invention's effect〕

As described above, according to the transformer of the present invention, the flat portions of which the cores are opposed to each other are connected by the rounded corner portions so that the end surface is a flat track shape, and only one flat portion is wound. As a result, the transformer is thin, and the mounting surface is horizontal and flat, so that it is possible to provide a transformer that can be surface-mounted.

[Brief description of drawings]

1 is a perspective view showing a transformer according to an embodiment of the present invention, FIG. 2 is a perspective view showing a conventional toroidal transformer, and FIG.
FIG. 4 is a perspective view showing a rectangular core, and FIG. 4 is a perspective view showing mounting of a conventional transformer on a substrate. 2 is winding, 3 is substrate, 21 is core, 22 is winding surface of core, 23
Is the mounting surface of the core, 24 is the primary winding, 25 is the secondary winding, T
Is a transformer. In the drawings, the same reference numerals indicate the same or corresponding parts.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location H01F 27/24 H01F 27/24 C

Claims (1)

(57) [Claims] 1. A core having plate-like first flat portions and second flat portions facing each other in parallel and a corner portion connecting these two flat portions, and the winding is provided only in the first flat portions. The transformer according to claim 1, wherein the transformer is wound around, and an end portion of the winding wire is arranged in the vicinity of the second flat portion so that the end portion of the winding can be surface-mounted on the substrate with the second flat portion as a mounting surface.