JPH0536262Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a transformer suitable for use in, for example, a power conversion transformer for a switching power supply and other transformers.

Conventionally, this type of power transformer used an integrally molded ferrite magnetic core and attached it to the bobbin, but in recent years, as the switching frequency has become higher, the ferrite core has been made thinner, and the ferrite cores have been connected to each other. Power transformers with multiple layers are being put into practical use. This thin ferrite core is laminated with an insulating layer interposed therebetween and then attached to a bobbin to form a power transformer.

However, the process of laminating thin ferrite cores with an insulating layer interposed therebetween is extremely inefficient and time consuming, resulting in a transformer that is extremely costly.

In order to eliminate these drawbacks, the main purpose of the present invention is to further improve the lamination efficiency of the ferrite core by providing an insulating layer on the bobbin itself in advance, and to propose a low-cost and highly stable transformer.

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

FIG. 1 is a perspective view of a transformer showing an embodiment of the present invention. A ferrite magnetic core 10 is formed by laminating a plurality of layers, for example, five thin ferrite cores 1, 2, 3, 4, 5, . . . each having a wall thickness (=2 mm). 6,
Reference numerals 7, 8, and 9 indicate gaps formed by insulating partitions, which will be described later, provided in advance on the bobbin 1A.

As shown in FIGS. 2 and 3, the bobbin 1A is
Insulating partitions 21, 22, 23, 24 are integrally molded during resin molding of the bobbin, and each insulating partition 21,
Gaps 25 are formed between the ferrite cores 22, 23, 24 and the inner walls of the bobbin, respectively, at intervals that match the thickness dimensions of the ferrite cores 1, 2, 3, 4, and 5. Therefore, ferrite cores 1, 2, 3, 4, 5 are inserted between insulating partitions 21, 22, 23, 24,
It can be assembled by taping etc.

Such a transformer has insulating partitions 21, 22,
Since the ferrite cores 23 and 24 are provided, gaps 6, 7, 8, and 9 are formed between the ferrite cores 1, 2, 3, 4, and 5, resulting in good insulation.

Note that the number of insulating partitions is not limited to four, and may be increased or decreased as appropriate depending on the number of stacked ferrite cores.

As described above, according to the present invention, in a transformer consisting of a bobbin in which a plurality of insulating partitions for ferrite cores are integrally molded, and a ferrite core inserted between the insulating partitions, the insulating partitions have a thin wall and the distance between them is small. By matching the thickness of the ferrite core with the thickness of the ferrite core, the conventional inefficient process of laminating and bonding thin ferrite cores through an insulating layer is eliminated, providing an inexpensive and highly stable power transformer. can do. That is, FIG. 4 is a perspective view of a conventional laminated magnetic core bobbin for comparative reference, but it is necessary to separately interpose an insulating layer on the laminated thin core.

[Brief explanation of the drawing]

1 and 2 are perspective views of a transformer and a bobbin showing an example of the present invention, and FIG.
FIG. 4 is a sectional view taken along the line, and a perspective view showing an example of a conventional transformer bobbin. 1, 2, 3, 4, 5... each ferrite core,
10...trans, 21, 22, 23, 24...
Insulating partition, 25... gap, 1A... bobbin.

Claims (1)

[Scope of Claim for Utility Model Registration] In a transformer consisting of a bobbin in which a plurality of insulating partitions for ferrite cores are integrally molded, and a ferrite core inserted between the insulating partitions, the insulating partitions have a thin wall and the intervals between them are made of ferrite. A transformer characterized by having a thickness that matches the thickness of the core.