JPH04164303A - E-shaped ferrite core and transformer using the same - Google Patents

Abstract

PURPOSE:To enable the title transformer to be made thinner by a method wherein the title E-shaped ferrite core wherein one end surface of a central magnetic leg is protruded from one end surfaces of both side magnetic legs. CONSTITUTION:The title E-shaped ferrite core is composed of both side magnetic legs 11, 12, a central magnetic leg 13 and a common magnetic leg 14 connecting these magnetic legs 11, 12, 13 with one another. Arc notches 15 are respectively provided on the inner central magnetic leg sides of said both side magnetic legs 11, 12. Besides, the central magnetic leg 13 is formed in sectional elliptic shape; the lower end surface is composed to be positioned lower than that of both side magnetic legs 11, 12, while the upper end surface is composed to be positioned within the range of the thickness of both side magnetic legs 11, 12. In such a constitution, when this E-shaped ferrite core 10 is used to compose the title transformer, the whole body thereof can be made thinner.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an E-type ferrite core used in various electronic devices and a transformer using the same.

2. Description of the Related Art In recent years, switching power supplies used in electronic equipment such as office automation equipment, video tape recorders, and television receivers have been required to be made thinner.

In other words, in this switching power supply, the transformer has the greatest problem in making it thinner, and there is a strong demand for making the transformer thinner.

Conventional transformers and E-type ferrite cores constituting the transformers have been constructed as shown in FIGS. 6 to 9.

First, the structure of a conventional E-type ferrite core will be explained using FIGS. 6 and 7. That is, this E-type ferrite core is composed of a central magnetic leg 1, both side magnetic legs 2.3, and a common magnetic leg 4. The central magnetic leg 1 has an oval shape, and the longitudinal center of the common magnetic leg 4 The oval central magnetic leg 1 is configured so that one end surface of the oval coincides with the lower side of the section, and the thickness of the oval central magnetic leg 1 is thinner than the thickness of the common magnetic leg 4.
, 3 are provided at both ends in the length direction of the common magnetic leg 4, and these both side magnetic legs 2, 3 have a rectangular cross section with an arc-shaped notch 5 on the inner surface of the central magnetic leg 11111I. The thickness of both side magnetic legs 2.3 is configured to be thicker than that of the common magnetic leg.

Two such E-type ferrite cores are used by butting each other as shown in FIG. 8 and FIG. A terminal plate 7 having a recess or opening into which a part of the coil 6 is fitted is attached, and a lead wire of the coil 6 is connected to a terminal 8 provided on the terminal plate 7 to form a transformer.

With this configuration, when this transformer is used by being incorporated into a printed circuit board, the thickness a of the transformer is the thickness b of the terminal plate 7, the thickness C of the central magnetic leg 1 on this terminal plate 7, and the coil 6.
The dimensions were the sum of the winding height d.

Problems to be Solved by the Invention In the conventional E-type ferrite core as described above, the height when mounted on a printed circuit board when used as a transformer is uncontrollably high.

That is, the thickness of the E-type ferrite core is added to the thickness of the terminal plate 7, and the thickness of the part of the coil 6 that protrudes from the E-type ferrite core is added, which is a major obstacle in achieving thinning. It became LS.

It is an object of the present invention to eliminate the above-mentioned conventional drawbacks and to provide an E-type ferrite core that can be made thinner and a transformer using the E-type ferrite core.

Means for Solving the Problems In order to solve the above problems, the E-type ferrite core of the present invention consists of magnetic legs on both sides, a center magnetic leg, and a common magnetic leg connecting these legs, wherein one end surface of the center magnetic leg is The magnetic legs on both sides are configured to protrude outward from one end surface.

Effect With the above configuration, if this E-type ferrite core is used, the height can be further suppressed even when a coil is wound to form a transformer, and the transformer can be made thinner.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings FIGS. 1 to 5.

First, the structure of the E-type ferrite core will be explained using FIGS. 1 and 2.

Reference numeral 10 indicates an E-type ferrite core, and this E-type ferrite core 10 is composed of both side magnetic legs 11, 12, a central magnetic leg 13, and a common magnetic leg 14 connecting these magnetic legs.

Arc-shaped notches 15 are provided on the inner surfaces of the magnetic legs 11 and 12 on the central magnetic leg side, respectively. The central magnetic leg 13 is formed to have an elliptical cross section, and the lower end surface of the central magnetic leg 13 is located below the lower end surfaces of the both magnetic legs 11 and 12, and the upper end surface of the central magnetic leg 13 It is configured to be located within a thickness range of 11°12°. Furthermore, the common magnetic leg 14 extends from both side magnetic legs 11 and 12 to the central magnetic leg 13.
It has a shape that is individually curved downward. This curvature may be curved or linearly inclined.

With the E-type ferrite core 10 having such a configuration, when the E-type ferrite core 10 is transported or stored, it is mutually positioned by stacking them as shown in FIG. This makes it possible to transport and store the product in a limited space, and it also makes it easier to take it out when it is time to use it.

The transformer using the above E-type ferrite core 10 is the fourth one.
It becomes as shown in Fig. 5. That is, two E-type ferrite cores 10 are butted together to form a closed magnetic path magnetic core, a coil 16 is wound around the central magnetic leg 13 of this closed magnetic path magnetic core, and a closed magnetic path magnetic core around which this coil 16 is wound is formed. Leave it on the terminal board 17. This terminal plate 17 has an opening or recess 18 formed in the center thereof into which the coil 16 is fitted, and a recess 19 is formed in the portion on which the common magnetic leg 14 is placed so as to match the shape of the common magnetic leg 14. Further, a terminal 20 is provided on the lower surface of this terminal plate 17, and a lead wire of the coil 16 is connected to this terminal 20.

With this configuration, the central magnetic leg 13 is located below the both side magnetic legs 11.12, so the coil 1
6 is the terminal plate 17 and the magnetic legs 1 on both sides of the E-type ferrite core 10.
It can be stored within the thickness range of 1.12, and the height a when mounted on a printed circuit board is the thickness b of the terminal board 17.
It is the sum of the magnetic legs C on both sides. Therefore, the overall thickness can be reduced.

Effects of the Invention As is clear from the above embodiments, the present invention enables the overall thickness of the transformer to be made thinner, and is extremely advantageous in application to various electronic devices. Since it can be stacked in position, it is extremely advantageous in storage, transportation, and removal during assembly, and is of great industrial value.

[Brief explanation of drawings]

Fig. 1 is a front view showing an embodiment of the E-type ferrite core of the present invention, Fig. 2 is a bottom view of the same, Fig. 3 is a front view showing the laminated state of the E-type ferrite core, and Fig. 4 is the same. A sectional view of a transformer using an E-type ferrite core, FIG. 5 is a top view of the transformer, FIG. 6 is a front view of a conventional E-type ferrite core, FIG. 7 is a bottom view of the same, and FIG. 8 is a top view of the transformer. FIG. 9 is a cross-sectional view of a transformer using a type ferrite core, and FIG. 9 is a top view of the transformer. 10...E type ferrite core, 11.12...
... Magnetic legs on both sides, 13... Central magnetic legs, 14.
... Common magnetic leg, 16 ... Coil, 17.
...Terminal board, 18...Opening or recess,
20...Terminal. Name of agent: Patent attorney Haruaki Koebi and two others
! -MO13-Central leg 〃-6 terminal t4--Common 11- Fig. 5 Fig. 6

Claims (4)

[Claims] (1) An E-type ferrite core consisting of magnetic legs on both sides, a central magnetic leg, and a common magnetic leg connecting these legs, with one end surface of the central magnetic leg protruding outward from one end surface of the magnetic legs on both sides. (2) The E-type ferrite core according to claim 1, wherein the other end surface of the central magnetic leg is located within the thickness range of the common magnetic leg. (3) The E-type ferrite core according to claim 1, wherein the common magnetic leg is curved from both side magnetic legs toward the center magnetic leg. (4) A transformer formed by winding a coil around the central magnetic leg of the E-type ferrite core according to claim 1, 2 or 3.