JPH1064732A - Holder for transformer core and transformer using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provided a holder for a transformer core which is manufactured with efficiency and at low cost, has high reliability, and enables a low-profile transformer. SOLUTION: Protruding portions 3a, 3b of two stacked cores 7 are pressed and held by U-shaped molded portions 4, and positions channels 10 formed in molded coils 9 are pressed downward with protruding portions 8 by the spring force of an M-shaped molded portions 6 to position the molded coils 9 from side to side. Bent connecting portions 2 are used to correct displacements of the two stacked cores 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transformer core fixing holder and a transformer used for various electronic devices.

[0002]

2. Description of the Related Art A conventional structure of this type of transformer has a substantially E-shaped cross section having a pair of substantially rectangular parallelepiped convex magnetic legs at both ends of a rectangular plate and a columnar central magnetic leg at the center. Using a pair of cores opposed to each other, insert a coil bobbin directly connected to a pair of rectangular parallelepiped terminal blocks provided with flat terminals and a ring portion in which a coil formed by winding a copper wire and having an annular shape is buried in the central magnetic leg. After being housed in the space defined by the magnetic leg and the center magnetic leg, a pair of cores facing each other are fixed with tape.

[0003]

However, when the core size is reduced, it is extremely difficult to fix the core with the tape, the working efficiency is poor, and the thickness of the tape is larger than the external dimensions, and the tape is thinned. Was an obstacle. In addition, since the tape used as the core fixing tape is made of polyimide or the like having high heat resistance that can withstand the heat of reflow soldering, it has a disadvantage of being expensive.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a transformer core fixing holder which has good working efficiency, is inexpensive and can be made thinner, and a transformer using the same.

[0005]

According to the present invention, a pair of cores each having a magnetic leg at both ends and a central portion of a rectangular substrate, and having mountain-shaped protrusions at four corners are formed by aligning the magnetic leg sides. In the space to be formed, the coil terminal of the coil bobbin having a groove embedded in the terminal portion with the coil embedded therein is inserted into and engaged with the magnetic leg of the central portion so as to be located at the open portion of the core, and the mountain shape provided at the four corners In the transformer in which the protrusions are fixed, the core fixing holder is formed so as to fit the protrusion having the shape.
A core fixing spring for a transformer, wherein the pair of core fixing springs are integrally formed at the joints on the side surfaces, and the core fixing holder engages with the protrusions and grooves to hold the core and position the coil bobbin; It is a transformer using it.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS.

The transformer fixing holder of the present invention is shown in FIG.
As shown in FIG. 2, two core fixing spring portions 1 made of a spring material
a, 1b and the curved joint 2 are connected. The core fixing springs 1a, 1b are formed in a U-shape forming part 4 corresponding to the mountain-shaped protrusion 3 of the core 7 shown in FIG. And claws 5
And an M-shaped molded part 6.

[0008] As shown in FIG.
The purpose is to fix and hold the protrusions 3 a and 3 b of the individual cores 7 by pressing with the claws 5. Further, the M-shaped molded portion 6 is held and fixed by the projection 8 at the position of the positioning groove 10 provided in the molded coil 9 while holding the molded coil 9 downward.

Further, the position of the core 7 is corrected and held by the curved joint 2 connecting the core fixing springs 1a and 1b.

When assembling a transformer using the core fixing holder according to the present invention, the joint portion 2 is expanded and fitted into the side surface of the core 7 and at the same time, the claw portion 5 of the U-shaped portion 4 is formed.
Is spread outward and inserted into the protrusions 3a and 3b of the core 7 and fitted. At the same time, the projection 8 formed at the center of the M-shaped molded portion 6 is expanded upward, and the projection 8 is aligned with the positioning groove 10 of the molded coil 9 and fixed.

As described above, the core fixing holder presses and fixes the protrusions 3a and 3b of the core 7 with the U-shaped forming part 4 and provides the molded coil 9 with the spring property of the M-shaped forming part 6. By pressing the positioning groove 10 portion downward with the projection 8, the positioning of the mold coil 9 in the left-right direction is performed. Moreover, the displacement of the upper and lower two cores 7 can be corrected by the curved joint 2.

[0012]

As described above, according to the present invention, it is possible to obtain a core fixing holder for a transformer, which has a high working efficiency, is inexpensive, and can be applied to a highly reliable thin transformer, and a transformer using the same. .

[Brief description of the drawings]

FIG. 1 is a perspective view of a transformer core fixing holder of the present invention.

FIG. 2 is a side view of the transformer core fixing holder of the present invention.

FIG. 3 is a perspective view of a transformer using the transformer core fixing holder of the present invention.

FIG. 4 is a perspective view of a projection of a transformer core.

[Explanation of symbols]

 1a, 1b Core fixing spring part 2 Joint part 3, 3a, 3b Projection part 4 U-shaped part 5 Claw part 6 M-shaped part 7 Core 8 Projection part 9 Mold coil 10 Positioning groove

Claims (2)

[Claims] A coil is buried in a space formed by aligning the magnetic leg sides of a pair of cores having magnetic legs at both ends and a central portion of a rectangular substrate and having mountain-shaped protrusions at four corners. The coil terminal of the coil bobbin having a groove in the terminal portion is inserted into and engaged with the magnetic leg of the central portion so as to be located at the open portion of the core, and the mountain-shaped protrusions provided at the four corners are fixed. A core fixing holder used for a transformer, wherein a pair of core fixing springs formed so as to fit with the projections of the above-mentioned shape are integrally formed at a joint on a side surface, and the core fixing holder is engaged with the projections and the grooves. A core fixing holder for a transformer, which holds a core and positions a coil bobbin in combination. 2. A transformer using the transformer core fixing holder according to claim 1.