JPS6218011Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a multi-transformer device, and an object of the present invention is to provide a multi-transformer device that can miniaturize the device and simplify its configuration and assembly by assembling a plurality of transformers on one board. purpose.

Generally, when a commercial AC power source is used to drive a transistor circuit, a motor circuit, a relay circuit, etc., the AC must be converted into a DC low voltage by a DC stabilized power source in advance. The dropper type power supply conventionally used as this conversion means has a very simple circuit configuration, but has the drawbacks of being large in overall size and having poor efficiency. As an alternative to this, there are recently switching power supplies, which have the advantage of being relatively small in overall size and being highly efficient, but have the disadvantage of using multiple transformers and making the circuit complex. Ta. FIG. 1 shows an example of a switching type DC stabilized power supply. A DC stabilized power supply 1 is applied to a VTR device, and converts AC input from an AC power terminal 2 to a transformer 3 (coils 3a, 3b) and a rectifying and smoothing circuit 4 as DC power to the DC power terminal for the VTR device main circuit. 5 and a DC power supply terminal 6 for the motor drive circuit, and the terminal 5 side is connected to a switching transistor 7 and a transformer 8 (coil 8).
a, 8b), transformer/rectifier circuit such as diode 9,
and control circuit 10, transformer 11 (coil 11
Similarly, on the terminal 6 side, a switching transistor 12, a transformer 13 (coils 13a, 13b), a diode 14, a control circuit 15, a transformer 16 (coils 16a, 16b) are provided.
is provided. Therefore, in the past, the five transformers 3, 8, 11, 13, and 16 were individually assembled into a circuit, resulting in a complicated circuit configuration and troublesome assembly work.

Therefore, the present invention is based on the above five transformers 3, 8,
The present invention aims to eliminate the above-mentioned drawbacks by providing a multi-transformer device in which 11, 13, and 16 are integrally constructed in a compact size. Examples thereof will be described below with reference to the drawings.

2A and 2B are a partially cut-away front view and a side view, respectively, of a vertical multi-transformer device, which is an embodiment of the multi-transformer device according to the present invention. In the figure, a vertical multi-transformer device 21 is constructed by mounting a multi-transformer 23 on a substantially board 22 and locking it with a metal case 24 . The substrate 22 is as shown in FIGS. 3A to 3D.
It is made of rectangular phenolic resin, etc., and has a plurality of notches 22a and holes 22b on the periphery of the upper surface of the substrate, four elongated holes 22d in a rectangular recess 22c inside thereof, and four convex holes on the lower surface of the substrate. The portions 22e are arranged in a row in the longitudinal direction, and the terminal pins 25 are implanted and fixed in the holes 22b, respectively.

The multi-transformer 23 has a ferrite core 26 and a plurality of coils 3a, 3b, as shown in FIG. ,8a,8
b, 11a, 11b, 13a, 13b, 16a,
16b is installed. The ferrite core 26 has comb-shaped core parts 28a to 28i, like the core half 27 which has a plurality of comb-shaped core parts 27a to 27i.
As shown in FIG. 4A, a core half 28 having a
A plurality of openings 29a to 29i are formed by abutting and opposingly joining the respective core portions. Therefore, when the multi-transformer 23 is joined, for example, a coil bobbin 8c (shown in FIG. 2A) having coils 8a, 8b is fitted to the core parts 27a, 28a to form the transformer 8, and the core parts 28c, 2
7d, 28f, 27g, 27i, and 28i are fitted with coil bobbins 11c, 3c, 16c, and 13c, respectively, to form transformers 11, 3, 16, and 13, and the rear part in FIG. 4A is shown in FIG. 2A. , the recess 2 on the upper surface of the substrate 22 in the upright position on the lower side in B.
2c to a slight depth, and each lead of each coil 3a, 3b, . be done.

As shown in FIGS. 5A to 5C, the metal case 24 has a pair of mounting plates 24 on each lower side of the box-shaped lid 24a.
b is extended, and a narrow terminal portion 24c and a locking convex portion 24d are formed at the lower end of each mounting plate portion 24b.
The metal case 24 is attached by fitting the lid part 24a onto the upper part of the multi-transformer 23, and each mounting plate part 24b has a core part 27 having no coil bobbin.
b, 28b; 27h, 28h are in close contact with both sides, and each terminal portion 24c and locking convex portion 24d are connected to the long hole 22 of the board.
d and protrude. Here, each locking convex portion 24
d are respectively bent outward at a predetermined angle and engaged with the lower surface of the board 22 to lock the case 24. In this way, the multi-transformer 23 is firmly attached to the board 22 by the case 24.

This vertical multi-transformer device 21 is incorporated into a printed circuit board (not shown) of the circuit shown in FIG. Since they are integrated into one circuit component, the configuration can be simplified and miniaturized, and since the coil leads of each transformer are also processed all at once, it is easy to assemble to the printed circuit board. Prints can also be centrally arranged, print designs can be easily made, the size can be reduced, and maintenance is also easy. When the vertical multi-transformer device 21 is assembled into a printed circuit board, the terminal pins 25 pass through the printed circuit board, and each convex portion 22e at the center of the bottom surface of the board 22 comes into contact with the top surface of the printed circuit board. There is a slight gap between the portion near 25 and the top surface of the printed circuit board, and the coil lead winding portion is protected from being pressed against the printed circuit board, thereby preventing connection failures and the like.

6A to 6C show a horizontal multi-transformer device which is another embodiment of the multi-transformer device of the present invention.
The horizontal multi-trans device 31 is the multi-transformer 2
3 is placed horizontally on a board 32 and attached with a metal case 33. The substrate 32 is also made of phenolic resin and is formed into a rectangular shape, as shown in FIG. 7A.
As shown in ~C, a plurality of notches 32 are formed around the substrate.
a, a hole 32b, a recess 32c at the center of the top surface of the board, and a pair of notch recesses 32d on both sides of the board;
Furthermore, it has four elongated holes 32e and a plurality of convex portions 32f on the lower surface of the substrate, and a terminal pin 25 is implanted and fixed in each hole 32b, respectively.

The multi-transformer 23 is the same as that shown in FIGS. 4A and 4B, and the top surface in FIG. 4A is shown in FIGS.
It is placed on the upper surface of the substrate 32 as the lower surface side in C, and the leads of each coil are respectively connected to the corresponding terminal pins 25 via the notches 32a.

As shown in FIGS. 8A to 8C, the metal case 33 has a pair of mounting plate parts 33c (respective locking protrusions 33) at the bottom of a lid part 33a (having a pair of connecting plate parts 33b).
d) and each pair of terminal portions 33e are extended. The metal case 33 has a lid part 33a, a multi-transformer 23, each connecting plate part 33b, and core parts 27b, 28b, which do not have a coil bobbin;
The locking convex portions 33d of each mounting plate portion 33c protrude through the long holes 32e of the board, and each terminal portion 33
e project to the lower surface of the substrate 32 through the outside of the notch recess 32d. Here, each locking convex portion 33d is bent outward to lock the case 33.

This horizontal multi-transformer 31 also has a first
The circuit board 32 is attached to the printed circuit board (not shown) of the circuit shown in the figure.
The vertical multi-transformer device 21 has the same advantages as the vertical multi-transformer device 21 described above.

In each of the above embodiments, each transformer 3, 8, 11, 1
If you want to set the capacitance of coils 3 and 16 to be large, make the area of the openings 29a to 29i large respectively.
a, 3b, . . . 16a, 16b with a large winding diameter and a large number of windings, and each core portion is designed so that the magnetic flux in each core portion 27a, 28a, . It is sufficient to set the cross-sectional area of the transformer to be large, and vice versa when the transformer capacitance may be small.

As described above, the multi-transformer device according to the present invention has the following features.

1 Since it has a structure in which multiple transformers are integrated, it can be miniaturized and can be easily installed on a printed circuit board.Furthermore, by using the multi-transformer device of the present invention, it is possible to The overall shape of the stabilized power source can be made small.

2. Since the transformer is fitted into the recess on the upper surface of the insulating substrate, the transformer can be positioned with respect to the insulating substrate, and the mounting position of the transformer with respect to the insulating substrate can be kept constant.

3. The case is firmly fixed to the insulating substrate by inserting it through the insulating substrate and engaging the lower surface thereof, and the core portion of the transformer, which does not have a bobbin, is tightly attached to a part of the case, and the upper surface of the insulating substrate It fits into the recess. Therefore, it is possible to obtain a structure in which the transformer is firmly attached to the insulating substrate without play.

4. The protrusion on the lower surface of the insulating board forms a gap at the connection point of the coil lead to the terminal pin that is sufficient to prevent the multi-transformer from being pressed against the printed circuit board when the multi-transformer device is mounted on the printed circuit board. . This protects the connection portion and prevents contact failure at the connection portion due to attachment of the multi-transformer device to the printed circuit board.

5. Since the core that makes up the transformer is made up of a pair of core halves, there are only two parts that make up the core, and the core part can also be assembled with good workability.

[Brief explanation of drawings]

Fig. 1 is a circuit diagram of an example of a DC stabilized power supply using a transformer, and Figs. 2 A and B are a cutaway front view of a vertical multi-transformer device, which is an embodiment of the multi-transformer device according to the present invention. Figure and side view, Figure 3A
- D are a plan view, a front view, a bottom view of the board of the above-mentioned vertical multi-transformer device, and D-D in A of the same figure, respectively.
FIGS. 4A and 4B are a perspective view and a circuit diagram of the multi-transformer of the multi-transformer device, and FIGS. 5-5C are a plan view and a front view of the case of the vertical multi-transformer device, respectively. Figures 6A to 6C are partially cutaway plan views, front views, and side views of horizontal multi-transformers according to other embodiments of the multi-transformer described above, and Figures 7A to 7D are respectively, A plan view, a front view, a bottom view, and a vertical sectional view taken along the line DD in FIG. They are a front view and a side view. 1...DC stabilized power supply, 2...AC power supply terminal,
3, 8, 11, 13, 16...trans, 3c,
8c, 11c, 13c, 16c... Coil bobbin, 5, 6... DC power supply terminal, 7, 12... Switching transistor, 24... Vertical multi-transformer device, 22, 32...... Board, 23... Multi Transformer, 24, 33...Case, 24d, 3
3d... Locking convex portion, 25... Terminal pin, 26...
Ferrite core, 27, 28... Core half, 27
a~27i, 28a~28i... core part, 31...
...Horizontal multi-transformer device.

Claims (1)

[Claims for Utility Model Registration] A core formed by joining a pair of core halves facing each other, each having a plurality of comb-shaped core portions, and a coil wound around a bobbin fitted to a selected core portion of the core. a transformer having a recess on the upper surface into which the transformer fits, a terminal pin to which the lead of the coil is connected is implanted on the lower surface, and a mounting height is determined on the lower surface to connect the terminal of the lead. an insulating substrate having a convex portion that protects the connection portion to the pin; and an insulating substrate that encloses the transformer, is in close contact with a core portion of the core portion to which the bobbin is not fitted, and is inserted through the insulating substrate and the insulating substrate. A multi-transformer device comprising a case that is attached to the insulating substrate by engaging with the lower surface of the substrate and fixing the transformer to the insulating substrate.