JP2701066B2 - Small transformer - Google Patents

Description

The present invention relates to a small transformer having a plurality of coils.

"Conventional technology" Many of conventional small transformers include a cylindrical bobbin having flanges at both ends, a coil wound around the bobbin, a core assembled so as to be housed inside the bobbin, and a bobbin. It is composed of terminal pins that are implanted in the flange and that have their coil ends fixed.

And what is constituted as a step-up transformer is an output coil wound many times with extra fine wire winding materials,
An input coil wound a small number of times with a winding material having a larger wire diameter than the output coil.

The core is often made of ferrite material,
It is configured as an EE type core, an EI type core or an I type core.

[Problem to be Solved by the Invention] As in the above-described step-up transformer, a small transformer in which an input coil and an output coil are wound by wires having different wire diameters has an output coil having a thin wire diameter and one automatic winding. After winding by an automatic winding machine, an input coil having a large wire diameter is wound by another automatic winding machine, or conversely, an output coil is wound after an input coil is wound first.

In this way, every time the wire diameter of the coil to be wound is different, the winding part, which is a semi-finished product of a small transformer, is transferred to another automatic winding machine and wound. A transfer step and a step of newly setting the transferred winding parts in the automatic winding machine are added, and this is an important problem in improving the winding efficiency.

In addition, installing an automatic winding machine every time winding a coil having a different wire diameter has a problem that the space and cost of the winding machine equipment are increased.

Although an automatic winding machine capable of winding a plurality of coils having different wire diameters by a single unit has been developed, it is not widely used at present because of its complicated structure and high cost.

The present invention has been made in view of the above circumstances, and has as its object to develop a small transformer capable of efficiently winding a plurality of coils having different wire diameters.

[Means for Solving the Problems] In order to achieve the above object, according to the present invention, in a small transformer having a plurality of coils, one of at least two coils wound with a single-wire winding material is used. A coil and the other coil continuously wound around the one coil as a folded double line with the winding materials drawn from the winding end portion of the one coil, and the winding end of the one coil A portion and a winding start portion of the other coil are formed by the stranded wire of the double wire and fastened to a terminal pin, and the other coil is wound by the double wire which is not a stranded wire, and an end portion of the winding is formed by the double wire. The present invention proposes a compact transformer characterized by being formed of a stranded wire and fixed to a terminal pin.

[Operation] The above-mentioned small transformer includes one coil wound with a single-wire winding material, and the other coil wound with a double wire of the winding material, and furthermore, both ends of these coils. Is fixed as a stranded wire to a terminal pin or the like.

The stranded wire at the coil end has a high fastening strength to the terminal pin.

Therefore, when configured as a step-up transformer,
The other coil consisting of multiple wires is the input side, and the other coil consisting of the single wire is the output side. In this case, the wire diameter of the input coil can be made equivalent to the wire diameter by increasing or decreasing the number of turns of the winding material.

Further, according to the above-mentioned small transformer, it is possible to equip coils suitable for various wire diameters according to the number of turns of the winding material, so that a small transformer having two or more coils having different wire diameters is provided. Can be similarly implemented.

"Example" Next, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view of a trigger transformer provided in a flash discharge light emitting device as a photographing illumination device, FIG. 2 is a longitudinal sectional view of the trigger transformer, and FIG. 3 is a simplified circuit diagram of the trigger transformer. .

In these figures, reference numeral 11 denotes a bobbin, which has a structure in which rectangular flanges 11b and 11c are integrally provided above and below a rectangular tubular winding portion 11a, and the lower flange 11b has four thick walls. Terminal pins 12 to 15 are implanted. The terminal pins 12 and 13 are external connection terminals on the low voltage side, and the other terminal pins 14 and 15 are idle terminals.

A convex portion 11d is formed integrally with the upper flange 11c, and the high-voltage side terminal pin 16 is implanted in the convex portion 11d so as to be horizontal as shown in the figure.

After the output coil 17 is wound on the bobbin 11, the input coil 18 is wound with the same wire. For the output coil 17, a very thin wire is used, for example, wound with a single wire of about 0.05φ, and the input coil 18 is wound with a plurality of (for example, three) wires the same as the output coil 17. .

One end of the output coil 17 is drawn out from the guide groove 11e and fixed to the terminal pin 16, and the other end is drawn out from the guide groove 11f and fixed to one terminal pin 13.

One end of the input coil 18 is fixed to the terminal pin 12 drawn out from the guide groove 11f, and the other end is fixed to the terminal pin 13 in common with the other end of the output coil 17.

As described above, the bobbin 11 equipped with the coils 17 and 18 has a columnar ferrite core 19 inside the winding portion 11a to form a trigger coil. Note that an insulating tape 20 is wound around the outer periphery of the coil.

The above-mentioned trigger transformer is wound by an automatic winding machine shown as an example in FIG.

This automatic winding machine includes a rotary table 22 having radially arranged winding jigs 21 and a fryer 23 provided so as to face the winding jigs 21. The flyer 23 is connected to a wire rod 26 via a tension device 24 and a twisting machine 25.
The winding material 27 is sent more.

The automatic winding machine mounts the bobbin 11 on the winding jig 21 and performs winding while intermittently rotating the rotary table 22 by 1/4 turn.

FIG. 5 shows a plan view of the rotary table 22 described above.
In this figure, the bobbin 11 is attached to the winding jig 21 located on the lower side.
Attach.

In the bobbin 11 set in this way, the turntable 22 is 1 /
By rotating four times, it moves to the right side position facing the flyer 23. In this rotation position, the winding portion 11a of the bobbin 11
Then, the output coil 17 and the input coil 18 are wound by turning the fryer 23.

In this winding process, the output coil 17 is formed by winding the winding material 27 with a single wire on a predetermined line, and when the output coil 17 approaches the end of the winding, the winding is temporarily stopped and the twisting machine is turned off.
25 forms a twisted line.

Here, the twisting machine 25 forms a stranded double track by a method shown in principle in FIGS. 6 and 7. That is,
The winding material 27 is folded back using a pair of hook pins 28, 29 arranged at a predetermined interval. That is, the winding material 27 pulled out from the bobbin 11 is hung on the outside of one hooking pin 28, and then is hung on the outside of the other hanging pin 29, and is wound on the tension device 24 side.
27. By this operation, the winding material 27 is fixed to the hanging pins 28, 29.
There are three double tracks between them.

In these drawings, the bobbin 11 side is a coiled material 27a,
The tension device side is shown as a winding material 27b.

Then, the two twisting pins 3 provided between the hanging pins 28 and 29
By turning 0, 31 in the direction (pin axis direction) perpendicular to the winding material 27, the three double tracks are twisted, and the hooking pins 28,
29 and the pins 30, 31 are pulled out from the winding material 27.

By this operation, a stranded double line having a predetermined length as shown in FIG. 8 having lines 33a and 33b on both sides of the double line 33 is formed.

When the automatic winding machine is restarted after forming the double track as described above, the output coil 17 is continuously wound and the stranded wire 32 is
After "a" is wound as the output coil 17 for two or three turns, the stranded wire 32a is pulled out from the guide groove 11f and wrapped around the terminal pin 13.

The stranded wire 32a wound on the terminal pin 13 moves to the winding of the input coil 18 without cutting.

The input coil 18 is wound around the output coil 17 with a double wire 33 after winding the stranded wire 32a for 2 to 3 turns, and the stranded wire 32b is wound as a coil end portion for 2 to 3 turns and pulled out from the guide groove 11f. Terminal pin 12.

After the output coil 17 and the input coil 18 are wound as described above, the turntable 22 makes a quarter turn, and moves to the winding of the bobbin 11 newly sent to the flyer position.

Note that the twisted wire 32b tied to the terminal pin 12 turns the rotary table 22 1/4 turn without cutting, and the fryer 23 ties the wire 32b by the terminal pin 16 of the newly sent bobbin. The stranded wire 32b is drawn into the bobbin 11 through the guide groove 11e. In this operation stage, the crossover portion (the stranded wire 32b) passed between the bobbin already wound and the bobbin to be wound is cut off.

Subsequently, the output coil 17 of the bobbin 11 to be newly wound is wound. After the first few turns of the bobbin 11 are wound by the stranded wire 32b, the single-turn winding material 27 is wound. Is done.

That is, when the output coil 17 is wound two or three turns, the stranded wire 32b ends and becomes a single wire.

When the winding of the output coil 17 approaches the end, the automatic winding machine stops temporarily, and the twisting machine 25 forms a stranded double wire as shown in FIG. The winding of the bobbin 11 is performed.

FIG. 9 is a circuit diagram of the output coil 17 and the input coil 18 showing the above-described winding process.

The bobbin 11 wound in this manner is sequentially sent out, and the bobbin 11 sent to the left side position of the rotary table 22 is removed from the winding jig 21 in FIG. After that, the coil end portion tied to the terminal pin is soldered. In addition,
When the bobbin 11 is sent to the upper position or the left lateral position of the turntable 22, the insulating tape 20 is wound around the coil.

As can be understood from the above description, the twisted double wire formed by the twisting machine 25 is a winding end portion 101 of the output coil 17 of the bobbin 11 to be wound first and a terminal pin connecting portion 10 thereof.
2, the length including the input coil 103 of the bobbin 11, the terminal pin connecting portion 104 of this coil, the crossover 105, the terminal pin connecting portion 106 of the bobbin 11 to be wound next, and the winding start portion 107 of the output coil. Formed.

As shown in FIG. 3, the small transformer wound by the above-described method is composed of an output coil 17 wound by a single wire of the winding material 27.
The two coil ends (including the terminal pins) are stranded wires 32a and 32b, and the input coil 18 is
, And a double wire 33 of the continuous winding material 27, and both end portions of the input coil 18 become stranded wires 32a and 32b.

FIG. 10 is a circuit diagram of another small transformer wound by the method described above.

In this transformer, the output coil 34 is wound around the bobbin in the same manner as in the above embodiment, and is wound around the terminal pin 35, and then the feedback winding 36 is wound around the terminal pin 37 without cutting the stranded wire, and is wound around the terminal pin 37. . The stranded wire passes from the terminal pin 37 to the terminal pin 38, and then the input coil 39 is wound by the double wire 33 shown in FIG. After winding in this manner, the turntable 22 is rotated by a quarter turn, and the stranded wire is wound around the terminal pin 41 of the bobbin to be wound next. Thereafter, the crossover portion M is cut in the same manner and the process proceeds to the winding of the output coil 34. The crossover N between the terminal pins will be cut off later.

FIG. 11 is a mechanism diagram showing a specific example of the above-described twisting machine 25.

As shown in the drawing, the hanging pin 28 is provided on the main body mounting portion 43 so as to apply a projecting force by a spring 42.

The hook pin 28 is configured to be able to move leftward in the drawing against the force of the spring 44 to expand the pressure.

The hook pin 29 is provided at the tip of the interlocking rod 46 attached to the main body attachment portion 45, and is configured to be able to move rightward in the drawing against the urging force of the spring 47. Twist pins 30 and 31 are swivel plates
A projecting force is applied to each of the springs 49 and 50 by the springs 49 and 50.

The turning plate 48 is fixed to a cylindrical shaft 52 driven via a pulley 51. A push-up rod 53 is provided on the revolving plate 48 together with the pins 30 and 31, and the push-up rod 53 is pushed up against the urging force of the spring 54 so that
Remove 32a. In addition, each of the hanging pin 28 and the twisting pins 30 and 31 is detached from the twisted wires 32a and 32b so as to be retracted against the urging force of the spring.

The wire puller 55 is fixed to the chain body 56, reciprocates in the range between the solid line position shown and the temporary line position on the left side, and winds the winding material 27 over the hanging pins 28 and 29. I have.

The chain body 56 extends over sprocket wheels 58, 59 driven by a motor 57.

In the above-described twisting machine 25, the equipment pulling-out tool 55 reciprocates and hangs the winding material 27 between the hanging pins 28 and 29, and then the turning plate 48 is turned so that the pins 30 and 31 are perpendicular to the paper surface. Turn in the direction. As a result, the stranded wires 32a and 32b are formed, and thereafter, the hanging pins 28 and 29 and the stranded pins 30 and 31 are pulled out from the stranded wire to form the stranded double line shown in FIG.

Such a double-stranded wire has a shorter operating time of the twisting machine 25 and a higher winding efficiency, and also has a smaller number of twisted wires, as compared to a case where the entire length of the input coil 18 is formed as a twisted wire. Therefore, there is no fear of insulation damage of the winding materials due to the formation of the stranded wire. The automatic winding machine for carrying out the present invention is not limited to the above-described one.For example, the stranded wire 32b drawn from the terminal pin 12 is temporarily fixed to a predetermined pin, and the temporarily fixed pin and the terminal pin 12 are connected to each other. Cut off the crossing,
The bobbin 11 to be wound next has a stranded wire 32
An automatic winding machine that draws b and winds the output coil 17 may be used. Further, when implementing the present invention, the input coil 18 can be wound first with the double track 33, and then the output coil 17 can be wound.

[Effects of the Invention] As described above, according to the small transformer of the present invention, various small transformers having a plurality of coils having different wire diameters can be wound by using winding materials having the same wire diameter. In addition, since each coil can be continuously wound, it becomes possible to perform winding by one automatic winding machine, and the efficiency of winding operation is greatly improved.

Furthermore, since each coil end portion fixed to the terminal pin becomes a stranded wire, the breakage of the coil of a small transformer using a thin wire is effectively prevented, and one coil is wound with a single wire, and the other is wound. Is wound with a double wire in which no wire is formed, the winding layer is made as thin as possible, which is extremely advantageous for further miniaturization of a compact transformer.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view showing a trigger transformer for a flash discharge light emitting device according to an embodiment of the present invention, FIG. 2 is a longitudinal sectional view of the trigger transformer, FIG. FIG. 4 is a simplified diagram showing an example of an automatic winding machine, and FIG.
The figure is a plan view showing a rotary table of the automatic winding machine, and FIG.
FIGS. 7 and 8 are diagrams for explaining the twisting of the twisting machine, FIG. 8 is a simplified diagram showing a stranded double wire formed by the twisting machine, and FIG. 9 is a winding process of the trigger transformer. FIG. 10 is an explanatory diagram showing a winding process of another small transformer, and FIG. 11 is a mechanical diagram showing a specific example of a twisted machine. 11 ... bobbin 12-16 ... terminal pin 17 ... output coil 18 ... input coil 21 ... winding jig 22 ... rotary table 23 ... fryer 25 ... twist machine 27 ... winding material 28 , 29… Hanging pins 30, 31… Twist pins 32 a, 32 b… Twisted wires 33… Double wires

Claims (1)

(57) [Claims] In a small transformer having a plurality of coils, one of at least two coils wound with a single-wire winding material, and the one coil pulled out from a winding end portion of the one coil. The other coil continuously wound around the one coil as a folded double line with the winding material being a double track, and the winding end portion of the one coil and the winding start portion of the other coil are formed by twisting the double wire. The other coil is wound with the above-mentioned double wire which is not formed as a stranded wire, and the winding end portion is formed of the above-described stranded wire and is fixed to the terminal pin. A small transformer characterized by the following.