JPH0547567A - Transformer - Google Patents

Abstract

PURPOSE:To provide an electronic circuit transformer which is high in productivity and excellent in characteristics. CONSTITUTION:At least loop circuits 18 and 19 which are partially cut out are provided to a U-shaped insulating base 17 as an upper and a lower layer, the base 17 is inserted into a bead core 30, a connector 22 where an upper connecting wire layer and a lower connecting wire layer are provided is fitted in the open end of the base 17 which projects from the bead core 30, the cutouts of the loop circuits 18 and 19 are replenished with the connector 22 for the completion of the loop circuits 18 and 19, and a transformer of this design is enhanced in productivity dispensing with operations such as twist and wiring of a coated wire and peeling of a coat from the wire and in characteristics by forming the bead core 30 in an integral structure.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transformer which is one of electronic circuit parts.

[0002]

2. Description of the Related Art As a transformer, which is one of electronic circuit components, there are conventional transformers shown in FIGS.

Coated wire rods 2 and 3 are wound around a cylindrical ferrite bead core 1, and the bead core 1 wound with the coated wire rods 2 and 3 is incorporated into a mounting base 4 to form coated wire rods 2 and 3.
Is connected to the terminals 5 and 6 provided on the mounting base 4.

Another conventional example is shown in FIGS. 19 and 20. Two upper and lower substrates 9 and 10 provided with spiral loop circuits 7 and 8 are sandwiched between the upper and lower bead cores 1a and 1b, adhered, and assembled into a practical base (not shown).

In the figure, 11 indicates an insulating binding band.

[0006]

However, the former of the above-mentioned conventional transformers uses the coated wire rods 2 and 3 for the bead core 1.
As a winding operation, the coated wire rods 2 and 3 are twisted, inserted into the holes of the bead core 1, and the coated wire rods 2 and 3 are peeled off and wound around the base terminals 5 and 6.
All were manual work, and the workability and productivity were poor.

Further, the latter is improved in assembling workability as compared with the former, but there is a problem that efficiency (characteristic) is remarkably lowered because the cores 1a and 1b are divided.

In view of the above situation, the present invention aims to provide a transformer which is excellent in productivity and highly efficient.

[0009]

According to the present invention, a U-shaped insulating base is provided with a loop circuit in which at least upper and lower two layers are partially cut off, the base is inserted into a bead core, and the bead core is inserted. A connector having at least two upper and lower layers of connection wires fitted to the projecting opening end, and the connector is used to replenish the cutout portion of the loop circuit to complete the loop circuit. Is.

[0010]

The transformer is constructed by inserting the base into the bead core, fitting the connector into the open end of the base, and completing the loop circuits facing each other vertically.

[0011]

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

First, a first embodiment will be described with reference to FIGS. The planar shape is a U-shape including the base portion 13 and the arm portions 14 and 15, and the opening portion of the base portion 17 is not formed on the front surface and the back surface of the synthetic resin base 17 having the legs 16 formed on the non-opening end side. The cut loop circuits 18 and 19 are formed. The loop circuits 18 and 19 are formed by an appropriate means such as plating.

The rear surface of the leg portion 16 is adapted to come into contact with the wiring board on which the transformer is to be mounted.
Connection terminals 20 and 21 for connecting to the wiring pattern are formed from the vertical surface to the back surface of the loop circuit. The connection terminals 20 and 21 are connected to one end of the loop circuits 18 and 19.

Each line 18 of the loop circuits 18 and 19
a, 18b ..., 19a, 19b ..
It is a connection end that has descended along the inner side surfaces of 4, 15.

A connector 22 is provided in the opening of the base 17.
The connector 22 has a leg portion 23 that abuts on a wiring board (not shown), and the vertical surface of the leg portion 23 is connected to the wiring pattern of the wiring board on the back surface. Terminals 37 and 38 are formed.

On the front and back surfaces of the connector 22, the lines 18a, 18b ..., 19 of the loop circuits 18, 19 are provided.
Connection line 2 for connecting a, 19b ... to complete a loop circuit
4a, 24b, 24c, 25a, 25b, 25c are formed, and relay terminals 26, 27 are formed on the innermost side. The relay terminals 26 and 27 are connected to the terminals 37 and 38 by through holes 28 and 29 formed in the horizontal direction.

In the figure, reference numeral 30 is a ferrite bead core, and the core 30 is provided with through holes 31 and 32 through which the arm portions 14 and 15 pass.

The arm portions 14 and 15 of the base 17 are inserted into the through holes 31 and 32 of the core 30, and the connector 22 is fitted to the tips of the arm portions 14 and 15. Thus, the transformer having the equivalent circuit of FIG. 2 is completed.

After fitting the arm portions 14 and 15 of the connector 22, the connection between each line and each connecting line is made by the elastic force of the arm portions 14 and 15, or after the fitting is further soldered. Good.

In order to ensure the fitting of the arm portions 14 and 15 with the connector 22 and the connection between each line and each connection line, the arm portion 1
The recesses 33 may be formed on the 4 and 15 sides at a required pitch, and the protrusions 34 that fit into the recesses 33 may be formed on the connector 22 side. In this case, removal of the connector 22 in the horizontal direction can be restricted.

Further, as shown in FIG. 3, the concave portion 35 and the convex portion 3 are shown.
6 is partially formed in the thickness direction. When the concave portion 35 and the convex portion 36 have such shapes, the connector 22 can be restricted from being pulled out in the horizontal direction and the vertical direction.

Further, in the embodiment shown in FIG. 1, the number of turns can be changed. That is, in the state shown in FIG. 4, the maximum number of turns is three, and when the connector 22 is pulled out by one turn as shown in FIG. 5 and fitted into the arm portions 14 and 15, the number of turns is two.

Next, another embodiment will be described with reference to FIG.
Although the ferrite bead core is not shown in FIG. 6,
It has substantially the same shape as that shown in FIG.

A base 1 having substantially the same shape as the base 17 shown in FIG.
Loop circuits 18 and 1 in which one part is cut off on both upper and lower surfaces of 7.
9 is formed. Since the loop circuits 18 and 19 are the same as those shown in FIG. 1, their description will be omitted.

In this embodiment, a conductive terminal 39 is formed outside the connection terminal 20 to which the upper loop circuit 18 is connected, from the upper surface to the vertical surface and further to the lower surface.

A U-shaped loop circuit board 40 is superposed on the upper surface of the base 17. Another loop circuit 41 is formed on the upper surface of the loop circuit board 40.
One end of 1 is connected to a connection terminal 42 formed from the vertical surface on the non-opening end side to the back surface. Also, the connection terminal 4
2 is connected to the conductive terminal 39. The connector 43 fitted into both arm portions 14 and 15 of the base 17 is substantially the same as the connector 22 shown in FIG. 1, except that a terminal 37 'equivalent to the terminal 37 extends further upward. It is formed over the upper surface of 43.

Each line 41 of the loop circuit 41 is attached to the connector 44 fitted in the opening of the loop circuit board 40.
Connection lines 45a and 45b for connecting a and 41b are formed, and the relay terminal 46 is a terminal 48 formed by a through hole 47.
It is connected to the. The terminal 48 is adapted to be connected to the terminal 37 'in a superposed state.

Then, the base 17 and the loop circuit board 40 are polymerized, a ferrite bead core (not shown) is fitted, and the connector 43 and the connector 44 are fitted to the base 17 and the loop circuit board 40, respectively. If combined, the transformer is completed, and an equivalent circuit corresponding to the transformer is as shown in FIG.

In addition, at the corners of the upper surface of the base 17, a lock hole 6 is formed.
7 is provided, a mating protrusion (not shown) that fits into the mating hole 67 is formed on the lower surface of the loop circuit board 40. The table 17 and the loop circuit board 40 are aligned with each other.

Another embodiment will be described with reference to FIGS. In this embodiment, loop circuits 49 and 50 are formed from a foil such as copper or a thin plate such as copper, and bent terminal portions 51, 52, 53 and 54 are formed at required portions, and the loop circuits 49 and 50 are formed.
50 is molded in synthetic resin. The shape of the molded synthetic resin is the same as that of the base 17 in FIG. 1, and therefore, the loop circuits 49 and 50 are partially exposed in the opening 56.

The intermediate portion of the exposed portion is cut off, and the exposed end is bent along the vertical surface of the arm portions 14 and 15.

Further, FIG. 10 shows a connector 57 fitted to the arm portions 14 and 15, and the connector 57 is also a foil of copper or the like.
The connection lines 58 and 59 formed of a thin film of copper or the like are embedded in a resin with both ends exposed, and the exposed ends are bent along a vertical surface. Then, when the connector 57 is fitted to the arm portions 14 and 15, the cutout portions of the loop circuits 49 and 50 are connected by the connector 57, and a complete loop circuit is completed.

In this embodiment, each loop circuit 49, 50
Both ends of can be gathered on the leg 16 side. Further, it is of course possible to embed the loop circuit in three layers or four layers. 11 to 14 show still another embodiment, in which the loop circuits 60 and 61 are formed from a foil such as copper or a thin plate such as copper, and the loop circuits 60 and 61 are molded with a synthetic resin. Is similar to the embodiment shown in FIGS. 9 to 10, but one end of the loop circuit 60, 61 is connected to the terminals 62, 63 formed on the leg portion 16, and the other end of the loop circuit 60, 61 is It is connected to terminals 65 and 66 formed on the connector 64.

In this embodiment, the number of turns of the transformer can be changed by moving the connector 64. That is, although there are three windings at the position of the connector 64 shown in FIG. 15, it is possible to make two windings by pulling out the connector 64 by one pitch as shown in FIG.

[0035]

As described above, according to the present invention, it is possible to omit a series of operations such as twisting of the coated wire, passing through the center hole of the core, peeling of the coating, fixing to the practical base, and the like. It can be greatly simplified. Further, since the bead core is not divided, it is possible to prevent the efficiency from being lowered. Furthermore, various excellent effects can be exhibited such that the number of turns can be adjusted with the same structure.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of the present invention.

FIG. 2 is an equivalent circuit diagram of the embodiment.

FIG. 3 is a partial perspective view showing a relationship between a connector and a base.

FIG. 4 is a partial view showing a fitted state of a connector and a base.

FIG. 5 is a partial view showing a fitted state of the connector and the base.

FIG. 6 is an exploded perspective view showing another embodiment.

FIG. 7 is an equivalent circuit diagram of the other embodiment.

FIG. 8 is a perspective view of a loop circuit according to another embodiment.

FIG. 9 is a perspective view showing a state where a loop circuit is molded in the embodiment.

FIG. 10 is a perspective view showing a connector of the embodiment.

FIG. 11 is a plan view of the completed state of the embodiment.

FIG. 12 is a front view of a completed state of the embodiment.

FIG. 13 is a perspective view showing still another embodiment.

FIG. 14 is a perspective view showing a connector of the embodiment.

FIG. 15 is a partial view showing a fitted state of the connector and the base in the embodiment.

FIG. 16 is a partial view showing a fitted state of the connector and the base in the embodiment.

FIG. 17 is an explanatory diagram of a conventional example.

FIG. 18 is a front view of the conventional example.

FIG. 19 is an exploded perspective view of another conventional example.

FIG. 20 is a front view of the embodiment.

[Explanation of symbols]

 17 Base 18 Loop Circuit 19 Loop Circuit 22 Connector 30 Bead Core 41 Loop Circuit 43 Connector 44 Connector 49 Loop Circuit 50 Loop Circuit 55 Base 57 Connector 60 Loop Circuit 61 Loop Circuit

Front Page Continuation (72) Inventor Mikio Takano 2-3-13 Toranomon, Minato-ku, Tokyo Kokusai Electric Co., Ltd.

Claims (5)

[Claims] 1. A U-shaped insulating base having at least two upper and lower portions.
A layer is provided with a partially cut loop circuit, the base is inserted into a bead core, and a connector provided with connecting wires in at least two upper and lower layers is fitted to an opening end protruding from the bead core,
A transformer characterized in that the loop circuit is completed by replenishing the cutout portion with the connector to complete the loop circuit. 2. The transformer according to claim 1, wherein the loop circuit and the connecting wire are formed on the upper and lower surfaces of the base and the connector. 3. The transformer according to claim 1, wherein the preformed loop circuit and the connecting wire are embedded inside the base and the connector. 4. The transformer according to claim 1, wherein the relative position of the connector and the base can be changed and the number of turns of the loop circuit can be changed. 5. The transformer according to claim 1, wherein at least two loop circuits are formed on the base, at least one loop circuit board on which the loop circuit is formed on the connector, and the loop circuit board connector can be polymerized.