JP2000156321A - Transformer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transformer which is reduced in size by making the excessive winding of first and second windings in the horizontal or height wise direction. SOLUTION: A transformer is provided with a bobbin 26 comprising a bobbin section 24 having a through hole 23 between flanges 21 and 22 and pin terminal planting sections on both side faces of the flanges 21 and 22, first and second windings 27 and 28 wound around the bobbin 26 between the flanges 21 and 22 at both ends of the bobbin 26, first and second pin terminals 29 and 30 set on pin terminal setting sections 25 and, at the same time, respectively connected to the windings 27 and 28 by soldering, and a magnetic core 31 constituted in a closed magnetic circuit, inserted into the through hole 23 of the bobbin 26, and arranged on the pin terminal setting sections 25. The cross-sectional shape of the other pin terminal setting section 25 is formed in a step-like shape by forming a projecting section 33 on the side face of the section 25.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transformer used for various electronic devices, communication devices and the like.

[0002]

2. Description of the Related Art A conventional transformer will be described below with reference to the drawings.

FIG. 5 is a front sectional view of a conventional transformer, and FIG.
Is a front view of the transformer, and FIG. 7 is a perspective view of the transformer.

In FIG. 5 to FIG. 7, a conventional transformer is
A winding frame portion 4 having flanges 1 and 2 at both ends and having a through hole 3 between the flanges 1 and 2, and both flanges 1 and 2 of the winding frame portion 4
Bobbin 6 provided with pin terminal planting portion 5 provided on the side surface of
The first winding 7 and the second winding 8 made of an insulated copper wire wound between the flanges 1 and 2 at both ends of the bobbin 6, and the pin windings 5 Winding 7 and second
A first pin terminal 9 and a second pin terminal 10 which are respectively connected to the winding 8 by soldering, and a closed magnetic path magnetic core 11 which is inserted into the through hole 3 of the bobbin 6 and is arranged on the pin terminal planting portion 5. ing.

The first winding 7 and the second winding 8 are wound alternately in layers from the innermost side of the bobbin 6 to the first winding 7, the second winding 8, and the first winding 7. At the same time, it is wound so that the first winding 7 is arranged on the outermost side of the bobbin 6.

The first winding 7 and the second winding 8 are
In order to secure an insulation distance between the upper and lower layers, both flanges 1 and 2 of the bobbin 6 and the first and second windings 7 and
8, an insulating tape 12 is wound between the upper and lower layers.

Further, the first pin terminal 9 is implanted in one of the pin terminal implant portions 5, and the second pin terminal 10 is
The other pin terminal planting portion 5 is planted.

[0008]

In the transformer having the above structure, the bobbin 6 is provided on all the layers in order to secure an insulation distance between the upper and lower layers of the first winding 7 and the second winding 8.
Since the insulating tape 12 is wound between the first and second windings 7 and 8 and the first and second windings 7 and 8, the first and second windings 7 and 8 cannot be wound.

As a result, the first and second windings 7 and 8 need to be additionally wound in the horizontal direction or the height direction, and there is a problem that the size cannot be reduced.

The present invention has been made to solve the above-mentioned problem, and it is possible to reduce the number of windings of an insulating tape and eliminate the need to wind the first and second windings in the horizontal or height direction.
The purpose is to provide a transformer that is reduced in size.

[0011]

In order to achieve the above object, the present invention provides a reel having a flange at both ends and a through hole between the flanges, and a side surface of the collar of the reel. A first terminal and a second terminal formed of an insulated copper wire wound between flanges at both ends of the bobbin; A first pin terminal and a second pin terminal soldered to the first winding and the second winding, respectively, and inserted into the through-hole of the bobbin; The first winding and the second winding are wound in layers and wound so as to arrange the first winding on the outermost side of the bobbin, The first winding wound on the outermost side of the bobbin has at least one of the flanges. The first pin terminal is planted in one of the pin terminal planting portions, and the second pin terminal is planted in the other of the pin terminal planting portions. A projecting portion is provided on an end surface of the side surface of the pin terminal implant portion on the side of the closed magnetic circuit core, and the cross-sectional shape of the other pin terminal implant portion is stepped.

With the above configuration, the first winding is wound so as to be arranged on the outermost side of the bobbin, and the first winding wound on the outermost side of the bobbin is wound up to at least one flange. On the layer around which the outermost first winding of the bobbin is wound, the insulating tape is not wound up to at least one of the flanges, and the first winding can be wound up by the space, and the horizontal direction Alternatively, downsizing can be achieved in the height direction.

At this time, since the outermost first winding of the bobbin cannot have an insulation distance from the outer periphery thereof, the closed magnetic circuit core close to the first winding is charged to the first winding, and the first winding is charged. Having a potential substantially equivalent to that of the winding, the closed magnetic circuit core cannot secure an insulation distance from the second pin terminal planted in the other pin terminal planting portion, which may cause dielectric breakdown. .

[0014] Here, a protruding portion is provided on the end face of the other pin terminal mounting portion on the side of the closed magnetic circuit core, and the cross section of the other pin terminal mounting portion has a stepped shape. In addition, the insulation distance between the closed magnetic circuit core and the second pin terminal can be secured, and the occurrence of insulation breakdown due to miniaturization can be prevented.

In addition, usually, when the first and second windings are connected to the first and second pin terminals by soldering, the first and second pin terminals are tilted and attached to the liquid surface of the solder tank to form the bobbin. The insulating film of the first and second windings made of the insulated copper wire is melted by the heat of melting of the solder so that the back surface does not adhere to the liquid surface of the solder bath.
The second winding and the first and second pin terminals are electrically connected by soldering. The cross-sectional shape of the other pin terminal implanted portion is stepped, so that the other pin terminal can be connected at the time of this solder connection. The liquid level of the solder bath is prevented from adhering to the projecting portion provided on the side surface of the implanted portion, the solder in the electrical connection between the second winding and the second pin terminal, and the closed magnetic circuit charged in the first winding It is also possible to prevent a short circuit with the magnetic core.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION
A bobbin provided with a flange at both ends and having a through-hole between the flanges, a pin terminal planting portion provided on a side surface of the flange of the reel, and a bobbin provided with both ends of the bobbin A first winding and a second winding made of an insulated copper wire wound between flanges;
A first pin terminal and a second pin terminal soldered to the winding and the second winding, respectively; and a closed magnetic circuit core inserted into the through hole of the bobbin and arranged on the pin terminal planting portion. The first winding and the second winding are wound in layers and wound so as to arrange the first winding on the outermost side of the bobbin, and on the outermost side of the bobbin. The wound first winding is wound up to at least one flange, a first pin terminal is implanted in one of the pin terminal implants, and a second pin terminal is connected to the other of the pins. It is planted in the terminal planting portion, a projection is provided on the end face of the other pin terminal planting portion on the side of the closed magnetic circuit core, and the cross-sectional shape of the other pin terminal planting portion is stepped. This is the configuration.

According to the above configuration, the first winding is wound so as to be arranged on the outermost side of the bobbin, and the first winding wound on the outermost side of the bobbin is wound up to at least one flange. On the layer around which the outermost first winding of the bobbin is wound, the insulating tape is not wound up to at least one of the flanges, and the first winding can be wound up by the space, and the horizontal direction Alternatively, downsizing can be achieved in the height direction.

The second aspect of the present invention is the first aspect of the present invention.
In the invention described in the above, the first winding is connected to the high potential portion, the second winding is connected to the low potential portion, and the wire diameter of the second winding is larger than the wire diameter of the first winding. is there.

With the above configuration, the first and second windings and the first and second windings are arranged.
At the time of the solder connection with the second pin terminal, the second winding is connected to the low potential portion, and the wire diameter of the second winding is made larger than the wire diameter of the first winding. The amount used for connection between the second winding and the second pin terminal is larger than the amount of solder used for connection between the first winding and the first pin terminal. Although it is easy to occur, the second winding having a large wire diameter is connected to the second pin terminal planted in the other pin terminal planting portion having the stepped shape having the protruding portion. Can be prevented from dielectric breakdown.

(Embodiment) A transformer according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a front sectional view of a transformer according to an embodiment of the present invention, FIG. 2 is a front view of the transformer, FIG. 3 is a perspective view of the transformer, and FIG.
FIG. 4B is a solder connection state diagram showing the time of solder connection between the second winding and the first and second pin terminals. FIG. 4B shows the first and second windings of the ordinary transformer and the first and second pin terminals. FIG. 4 is a solder connection state diagram showing a state of solder connection.

1 to 3, a transformer according to an embodiment of the present invention has a winding frame portion 24 having flanges 21 and 22 at both ends and having a through hole 23 between the flanges 21 and 22. The bobbin 26 is provided with a pin terminal planting portion 25 provided on the side surfaces of the flanges 21 and 22 of the winding frame portion 24, and is made of an insulated copper wire wound between the flanges 21 and 22 at both ends of the bobbin 26. A first pin terminal 29 which is implanted in the first terminal 27 and the second terminal 28 and is soldered to the first terminal 27 and the second terminal 28, respectively.
And a second pin terminal 30, and a closed magnetic circuit core 31 inserted into the through hole 23 of the bobbin 26 and arranged on the pin terminal implant 25.

The first winding 27 is connected to a high potential portion on the commercial power supply side, the second winding 28 is connected to a low potential portion on the load circuit side, and the wire diameter of the second winding 28 is set to the first value. The diameter is larger than the wire diameter of the winding 27.

Further, the first winding 27 and the second winding 28
Are the first winding 27 and the second winding 2 from the innermost side of the bobbin 26.
8, the first winding 27, and alternately wound in layers,
The first winding 27 is wound so as to be arranged on the outermost side of the bobbin 26, and the insulating tape 32 is wound between the upper and lower layers.

The innermost first winding 2 of the bobbin 26
7 and the layer around which the second winding 28 outside the first winding 27 is wound, the insulating tape 32 is wound between the flanges 21 and 22 at both ends, and the outermost In the layer around which the first winding 27 is wound, the insulating tape 32 is wound between the first winding 27 and the other flange 22, but the insulating tape 32 is not wound between the other flange 21 and the other. It is wound up to the space between the collar 22.

In addition, the first pin terminal 29 is implanted in one of the pin terminal implant portions 25 and the second pin terminal 30
Is provided in the other pin terminal planting portion 25, and a protrusion 33 is provided at the end of the side surface of the other pin terminal planting portion 25 on the side of the closed magnetic circuit core, and the other pin terminal planting portion is provided. 25 has a step-shaped cross section.

The operation of the transformer having the above configuration will be described below. According to the above configuration, the first winding 27 is wound so as to be arranged on the outermost side of the bobbin 26, and the bobbin 2
The first winding 27 wound on the outermost side of the bobbin 26 is wound on at least one of the flanges 21.
The insulating tape 32 is not wound on the layer around which the winding 27 is wound, and the first winding 27 can be wound by the space, so that the size can be reduced in the horizontal direction or the height direction. Can be.

At this time, the outermost first winding 2 of the bobbin 26
7 cannot secure an insulation distance from the outer periphery thereof, the closed magnetic circuit core 31 close to the first winding 27 charges the first winding 27 and has a potential substantially equal to that of the first winding 27. As a result, it becomes impossible to secure an insulation distance between the closed magnetic circuit core 31 and the second pin terminal 30 implanted in the other pin terminal implant portion 25, which may cause dielectric breakdown.

Here, since the protruding portion 33 is provided at the end of the side surface of the other pin terminal planting portion 25 on the side of the closed magnetic circuit core, and the cross section of the other pin terminal planting portion 25 has a step shape,
With the protruding portion 33, an insulation distance between the closed magnetic circuit core 31 and the second pin terminal 30 can be secured, and occurrence of dielectric breakdown can be prevented.

In addition, the first and second windings 27, 28
When soldering the first and second pin terminals 29 and 30,
As shown in FIG. 4B, conventionally, the first and second pin terminals 9 and 10 are tilted and attached to the liquid surface of the solder tank 34, and the bobbin 6
Of the first and second windings 7 and 8 made of insulating-coated copper wire by the heat of melting of the solder so that the bottom surface 35 of the first and second windings 7 and 8 does not adhere to the liquid surface of the solder bath 34. The two windings 7 and 8 are electrically connected to the first and second pin terminals 9 and 10 by soldering. As shown in FIG.
In the embodiment of the present invention, by making the cross-sectional shape of the step 5 a stepped shape, the liquid level of the solder bath 34 And the second winding 28 and the second pin terminal 3
Also, it is possible to prevent a short circuit between the solder in the electrical connection with zero and the closed magnetic core 31 charged in the first winding 27.
At this time, since the projecting portion 33 is provided at the end of the side surface of the other pin terminal implanting portion 25 on the side of the closed magnetic circuit core 31, the solder is interrupted by the wall surface 36 of the projecting portion 33, Does not adhere to the side surface 37 of the magnetic head, and an insulation distance from the closed magnetic circuit core 31 can be secured.

Further, when the first and second windings 27 and 28 are connected to the first and second pin terminals 29 and 30 by soldering, the second winding 28 is connected to a low potential portion, 28 wire diameter
Since the wire diameter is larger than the wire diameter of the winding 27, the amount of solder required for connection is better for the connection between the second winding 28 and the second pin terminal 30 than for the first winding 27 and the first pin terminal. Since the amount of solder used for connection with the core 29 is larger than the amount of solder to be used, and dielectric breakdown with the closed magnetic circuit core 31 is likely to occur, the second pin terminal planting portion 25 having the stepped shape having the protrusion 33 is planted. 2 pin terminal 3
Since the second winding 28 having a large wire diameter is connected to zero, dielectric breakdown with the closed magnetic circuit core 31 can be prevented.

As described above, according to the present embodiment, the insulating tape 32 is not wound around at least one of the flanges 22 on the layer around which the outermost first winding 27 of the bobbin 26 is wound.
The first winding 27 can be wound by the space, the size can be reduced in the horizontal direction or the height direction, and the side of the other pin terminal implant portion 25 on the side of the closed magnetic circuit core The projecting portion 33 provided at the end can secure an insulation distance between the closed magnetic circuit core 31 charged to the first winding 27 and the second pin terminal 30 due to miniaturization, thereby preventing the occurrence of dielectric breakdown. it can.

The first and second windings 27, 28 and the first,
At the time of the solder connection with the second pin terminals 29 and 30, the liquid surface of the solder bath 34 does not adhere to the protruding portion 33 provided on the side surface of the other pin terminal planting portion 25. The solder in the electrical connection with the second pin terminal 30 and the first winding 27
It is also possible to prevent a short circuit with the closed magnetic path magnetic core 31 that has been charged to a high level.

Further, since the second winding 28 is connected to the low potential portion and the wire diameter of the second winding 28 is made larger than the wire diameter of the first winding 27, the wire diameter of the second pin terminal 30 is reduced. The large second winding 28 is connected, so that even when the amount of solder is large at the time of solder connection, the insulation distance can be secured by the protruding portion 33, and the dielectric breakdown with the closed magnetic circuit core 31 can be prevented. it can.

[0035]

As described above, according to the present invention, the insulation distance between the closed magnetic path magnetic core charged in the first winding and the second pin terminal due to miniaturization is ensured to prevent the occurrence of dielectric breakdown. At the same time, the insulating tape is not wound on at least one of the flanges of the layer around which the outermost first winding of the bobbin is wound. Alternatively, a transformer whose size is reduced in the height direction can be provided.

[Brief description of the drawings]

FIG. 1 is a front sectional view of a transformer according to an embodiment of the present invention.

FIG. 2 is a front view of the transformer.

FIG. 3 is a perspective view of the transformer.

FIG. 4A is a cross-sectional view showing a solder connection state when the first and second windings of the transformer are connected to first and second pin terminals by soldering, and FIG. Sectional drawing which shows the solder connection state at the time of the solder connection of 2 windings and a 1st, 2nd pin terminal.

FIG. 5 is a front sectional view of a conventional transformer.

FIG. 6 is a front view of the transformer.

FIG. 7 is a perspective view of the transformer.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 21 Flange 22 Flange 23 Through hole 24 Winding frame part 25 Pin terminal planting part 26 Bobbin 27 First winding 28 Second winding 29 First pin terminal 30 Second pin terminal 31 Closed magnetic circuit core 32 Insulating tape 33 Projection 34 Solder bath 35 Bottom part 36 Wall surface 37 Side

Claims (2)

[Claims] A bobbin provided with a bobbin having flanges at both ends and having a through hole between the flanges, and a pin terminal planting portion provided on a side surface of the flange of the bobbin; A first winding and a second winding made of an insulated copper wire wound between flanges at both ends of the bobbin; A first pin terminal and a second pin terminal, each of which is solder-connected to a wire, and a closed magnetic circuit core inserted into the through-hole of the bobbin and arranged on the pin terminal implanted portion, The wire and the second winding are wound in layers, and the first winding is wound so as to arrange the first winding on the outermost side of the bobbin, and the first winding wound on the outermost side of the bobbin. The wire is wound up to at least one of the flanges, and the first pin terminal is connected to one of the pins. The second pin terminal is planted in the terminal planting portion, and the second pin terminal is planted in the other pin terminal planting portion. And a cross-sectional shape of the other pin terminal implanted portion having a stepped shape. 2. The first winding is connected to a high potential portion, the second winding is connected to a low potential portion, and a wire diameter of the second winding is larger than a wire diameter of the first winding. The transformer according to 1.