JPS5919393Y2 - small step-up transformer - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a small step-up transformer that can be used in various electrical devices, and particularly proposes a step-up transformer suitable as a trigger transformer for starting a flash discharge luminous tube.

Figure 1 in the drawings is a sectional view of a conventional trigger transformer, in which a primary coil 2 is attached to a magnetic core 1 made of ferrite material.
and a secondary coil 3 are wound with an insulating material (spacer) 4 in between.

The terminal pins 5.6 are implanted in small holes provided in each end face of the magnetic core 1, and one end 2b of the primary coil 2 and one end 3b of the secondary coil 3 are both connected to the terminal pin 5, and the secondary coil 3 is connected to the terminal pin 5. The other end 3a is wound and fixed to the terminal pin 6, respectively.

Further, as shown in the figure, an adhesive material (tomide or epoxy) 7 made of an insulating material is applied to the implanted portions of the terminal pins 5 and 6, so that the terminal pins 5 and 6 can be attached to the magnetic core.
is fixed to.

In addition, the illustrated reference numeral 2a is the other end of the primary coil 2, which is bonded to a terminal on the surface of the printed circuit board 8 by soldering or the like.

Figure 2 is a partial electrical circuit diagram of a flash discharge light emitter incorporating the above trigger transformer, in which 9 is a main discharge capacitor, 10 is a trigger capacitor, 11 is a trigger switch, and 12 is a flash discharge light emitter. In the arc tube, 12a is a starting electrode.

The disadvantage of the conventional example shown in FIG. 1 is that it is very unstable during assembly, which is not necessarily desirable electrically and mechanically.

That is, since the adhesive material 7 is applied to the end face of the magnetic core 1 in order to fix the terminal pins 5 and 6, when the transformer is assembled to the printed circuit board 8, the adhesive material 7 is applied to the end surface of the magnetic core 1.
Since the transformer comes into contact with this substrate 8, the transformer lacks mechanical stability in the lateral direction, for example, in the direction of the arrow shown in the figure.

Therefore, when assembling the transformer itself, it is installed accurately (almost perpendicular to the printed circuit board 8) as shown in the figure, but since many electrical components are assembled close to the printed circuit board 8, it is difficult to assemble the electrical components. When attached, the transformer is sometimes tilted due to lateral pressing force.

Such an inclination of the transformer can be corrected vertically with fingers or the like, but this inclination is
This may result in the coil end 2a being pulled strongly in one direction, resulting in a fatal problem in which the solder portion or the drawn-out portion of the coil end 2a is severed.

If the solder part breaks, you have to remove other electrical parts that were assembled next to it and reassemble the transformer, which is a very troublesome process. In some cases, the transformer itself becomes defective.

In order to avoid such problems, the coil end 2a is soldered with sufficient slack so that no tensile force is applied even if the transformer is tilted.

However, loosening the coil end 2a not only obstructs the assembly of adjacent electrical components, but also loosens the coil end 2a.
There is a risk that electrical interference from other electrical components may appear in the transformer a, causing malfunction of the transformer.

Although this electrical interference can be solved to some extent by coating the coil end 2a with an insulating coating, the effect is not sufficiently achieved and working efficiency is reduced, which is not preferable.

On the other hand, if the printed circuit board 8 receives a shock during assembly, or if the flash discharge light emitting device incorporating circuit components receives a shock for some reason, the trigger transformer may tilt. The same drawbacks as mentioned above occur, and even if the coil end 2a is not cut, the transformer comes into contact with other electrical components due to its inclination, resulting in an unexpected failure.

Therefore, as a means to solve the above drawback, the terminal pin 5
, 6 could be configured to support the inclination of the transformer due to external force by increasing the cross-sectional diameter of the transformer.
Since the magnetic core 1 cannot be made thicker, the conventional structure in which the terminal pins 5 and 6 are implanted on the end face of the magnetic core 1 naturally reaches a limit in the cross-sectional diameter of the terminal pins, so this method solves the above-mentioned drawbacks. I can't.

This invention was developed in light of the above-mentioned drawbacks, and allows the transformer and other electrical equipment to be connected by simply inserting the terminal pins into the specified locations on the printed circuit board, without directly adhering the coil end to the printed circuit board. In addition, the transformer is stably supported by a plurality of terminal pins arranged at appropriate intervals.

Therefore, in the present invention, one surface of an insulating terminal board is fixed to one end surface of a transformer magnetic core around which low-voltage and high-voltage coils are wound, and a terminal board is provided with an insulating terminal board extending in the direction of the board surface so as to protrude to the side of the transformer. Further, a high voltage terminal pin, in particular, among the terminal pins to be implanted in the terminal board, is passed through and fixed to this tongue piece, and the end of the high voltage coil is fixed to the high voltage coil end at the portion that penetrates the terminal board. It is characterized in that it is fixed to the terminal pin, and the coil ends of the other terminal pins are fixed on the other surface of the terminal board.

Hereinafter, embodiments of the present invention will be described with reference to the drawings to further clarify the content of the invention.

In FIGS. 3 and 4, 13 is a drum-shaped magnetic core made of ferrite material, which includes a primary coil 14 as a low-voltage coil and a secondary coil 15 as a high-voltage coil, sandwiching an insulating material 16 between them. It is wrapped as shown in the figure.

Reference numeral 17 denotes an insulating terminal board made of synthetic resin or the like, which is fixed to one end surface of the magnetic core 13.

The terminal board 17 has a tongue piece 1 extending along its plane.
7a and a notch 17b for drawing out each coil end.

Although not shown, the notch 1 is located at the lower flange of the magnetic core 1.
A notch is provided which overlaps with 7b.

Reference numerals 18 and 19 indicate low-voltage side terminal pins implanted in the terminal board 17, and these are implanted in the terminal board 17 at appropriate intervals so as to be located directly below the magnetic core 13.

20 is a terminal pin on the high voltage side, which has a tongue piece 17 at its upper part.
It is fixed to the terminal board 17 so as to penetrate through the hole a.

Note that one end of the primary coil 14 is connected to the terminal pin 18, and the secondary coil 1 is connected to the terminal pin 19 together with the other end of the primary coil 14.
In this case, each coil end is drawn out from the notch 17b of the terminal board 17 and wound around each terminal pin and fixed by soldering or the like.

In addition, the other end of the secondary coil 15 is connected to the terminal pin 20, and the coil end of the secondary coil 15 is soldered to the side of the transformer, that is, to the upper part of the terminal pin 20 on the upper side of the terminal board 17. It is fixed by etc.

The transformer with the above configuration can be connected to other electrical equipment by simply inserting the terminal pins into the printed circuit board, and is mechanically supported at three points by the three terminal pins 18, 19, and 20. The lateral supporting force of the transformer is extremely strong, and there is little risk of it tilting even when subjected to pressing force or impact force.

In particular, the transformer having the above structure is characterized in that the terminal pins 20 on the high voltage side can be implanted in the terminal board 17.

That is, the terminal pin 20 is fixed to the tongue piece 17a to increase the distance from other terminal pins 18 and 19 on the low voltage side, and the coil end of the secondary coil 15 is connected to the pin 20 on the upper side of the terminal board. Because of this configuration, no electrical discharge occurs between the terminal pin 20, which is a high voltage terminal, and the other terminal pins 18, 19.

Further, by making the magnetic core 13 into a drum shape as in the above embodiment, the area of the end surface can be increased, and the area of the terminal board 17 bonded to the end surface can also be correspondingly increased. Therefore, not only can the arrangement interval of each terminal pin be sufficiently widened, but also the connection work between each terminal pin and the coil end is facilitated.

Furthermore, if the interval between the terminal pins can be increased, it is possible to use terminal pins with a large cross-sectional diameter, which is advantageous.

Note that when the high voltage side has a relatively low voltage value, the coil end of the secondary coil 15 is cut out at a notch 17 shown by a dotted line in FIG.
C can be routed and connected to the terminal pins 20 on the lower side of the terminal board 17.

Further, in the above embodiment, the other end of the primary coil 14 and one end of the secondary coil 15 are commonly connected to the terminal pin 19.
An additional terminal pin may be provided to connect these coil ends separately.

Furthermore, the present invention is not limited to the above-mentioned transformer having a circular plane, but can be similarly applied to a rectangular transformer.

As described above, according to the present invention, it is possible to provide a compact step-up transformer that is electrically or mechanically stable not only during assembly but also after assembly. Since the coil ends are fixed to the high voltage terminal pins, failures due to discharges occurring at the low voltage and high voltage fill ends can be reliably prevented.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a trigger transformer showing a conventional example, FIG. 2 is a simplified electric circuit diagram of a flash discharge light emitter, and FIG. 3 is a longitudinal sectional view of a small step-up transformer showing an embodiment of the present invention.
FIG. 4 is a bottom view of the transformer. 13...Magnetic core, 14...Primary coil,
15... Secondary coil, 16... Insulating material, 17... Terminal board, 17 a... Tongue piece, 17b, 17C...・Notch, 18.19.
20...Terminal pin.

Claims (1)

[Scope of utility model registration request] One surface of an insulating terminal board is fixed to one end surface of a transformer magnetic core around which low-voltage and high-voltage coils are wound, and a tongue piece extending in the direction of the board surface so as to protrude to the side of the transformer is provided on the terminal board, Furthermore, among the terminal pins to be implanted in the terminal board, a high voltage terminal pin in particular is passed through and fixed to this tongue piece, and the end of the high voltage coil is fixed to the high voltage terminal pin at the part that penetrates the terminal board. The terminal pin is a small step-up transformer with the coil end fixed on the other side of the terminal board.