JP2003115411A - Coil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coil that is reduced in size and improved in connection reliability. SOLUTION: A plurality of wiring patterns 23 are arranged so that the patterns 23 may face the side face 22 of a terminal block 15 and, at the same time, may face the led-out positions of terminals 21 led out of the side face 22. The number of turns of a second winding is adjusted through the terminals 21 by connecting or non-connecting the adjacent ones of the wiring patterns 23 to each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coil device for a switching power supply, which is mounted on a thin power supply used for electronic devices, mainly communication devices and the like.

[0002]

2. Description of the Related Art In recent years, an increase in power consumption has become a social problem as information and communication infrastructure networks have made great progress. In particular, in order to meet the demand for downsizing of communication equipment and reduction of power consumption, the power supply system has been shifting from centralized power supply to distributed power supply.Currently, small and thin on-board power supplies are often used for these power supply units. Has been done. On the other hand, with the increase in the speed of LSIs, the increase in current and the decrease in voltage to reduce power consumption are rapidly advancing, and the on-board power supplies that drive these LSIs are also required to support low voltage / high current. Has been.

These thin on-board power supplies tend to drive the switching frequency at a higher frequency as a means for further miniaturization. In particular, for the transformer, which is a main component of the power supply section, there is a demand for a low-loss, low-noise, small-sized and inexpensive surface-mount type thin transformer suitable for high frequency driving. In order to meet the development needs of these power supplies, a laminated type coil device using a metal plate coil is often used as a thin transformer.

A conventional coil device will be described below with reference to the drawings.

10 (a) to 10 (e) are manufacturing process diagrams of a thin transformer body as a conventional coil device, and FIG. 11 shows a terminal block before molding in which a secondary main winding of the thin transformer body is arranged. It is a perspective view.

In FIGS. 10 and 11, 1 is a primary main winding, 1a is a primary auxiliary winding, 2 is a secondary main winding, 3 is a terminal,
Reference numeral 4 denotes a connecting portion, 5 a coil base, 7 a terminal block, and 8 a magnetic core.

10 and 11, the conventional coil device is formed by mounting a thin transformer body on a mounting board.

The thin transformer body has two primary main windings 1 in which the winding is wound in a flat shape, and 1 in which the winding is wound in a flat shape.
A coil in which a terminal 3 is planted at both ends of a laminated coil formed by laminating a plurality of primary auxiliary windings 1a and a secondary main winding 2 formed of three metal flat-plate coils punched from a copper plate. The terminal base 7 is arranged on the base 5, and the coil base 5 on which the laminated coil is arranged is molded (sealed) with an insulating resin.
And an EE type magnetic core 8 is incorporated in the terminal block 7.

At this time, in the laminated coil, the connecting portion 4 provided at the tip of the flat metal coil is connected to the terminal 3.
In particular, the connecting portion 4 and the terminal 3 are connected to each other by forming a through hole in the connecting portion 4 and inserting the terminal 3 into the through hole and performing solder connection or the like.

The thin transformer body is mounted on a mounting board to form a coil device.

[0011]

However, in the above-mentioned conventional structure, the secondary main winding 2 is formed by laminating the metal flat plate coils punched from the copper plate, and the connecting portion provided at the tip of the metal flat plate coil is formed. By inserting the terminal 3 planted in the coil base 5 into the through hole of 4, the connection portion 4 and the terminal 3 are connected. In particular, in order to adjust the number of turns of the secondary main winding 2, it is necessary to combine a plurality of metal plate coils and connect them to the terminals 3 by the connecting portions 4, respectively. Due to this, there are problems that miniaturization is difficult and connection reliability is reduced.

In order to solve the above problems, it is an object of the present invention to provide a coil device which is downsized and has improved connection reliability.

[0013]

To achieve the above object, the present invention has the following constitution.

The invention according to claim 1 of the present invention is
The metal flat-plate coil of the second winding has both ends as terminals, and the terminals are drawn out from the side surface of the terminal block in the same direction and connected to a plurality of wiring patterns arranged on the mounting board. By facing the side surface of the terminal block and arranging it so as to face the lead-out position of the terminal drawn out from the side surface of the terminal block, and connecting or disconnecting adjacent wiring patterns of the plurality of wiring patterns. The number of turns of the second winding is adjusted via the terminal.

With the above structure, the terminals at both ends of the metal flat plate coil forming the second winding are drawn out in the same direction from the side surface of the terminal block to face the side surface of the terminal block, and to face the lead-out position of the terminal. Since it is connected to the wiring pattern described above, the shape of the connection portion does not become complicated, the connection can be made with a simple shape, the size can be easily reduced, and the connection reliability can be improved.

In particular, since the number of turns of the second winding is adjusted by connecting or disconnecting adjacent wiring patterns in the wiring pattern, it is not necessary to arrange a complicated wiring pattern on the mounting board, and the size can be reduced. Further, it is possible to further improve the connection reliability, and further it is possible to prevent the loss of the DC resistance due to the routing of the wiring pattern and the like.

The invention according to claim 2 of the present invention is, in the invention according to claim 1, particularly a configuration in which a plurality of thin wires are molded in a terminal block and connected to the lead-out wiring pattern from the terminal block. . With the above configuration, the thin wire can be used as a dummy terminal with respect to the terminals at both ends of the metal plate coil.

According to a third aspect of the present invention, in the invention according to the first aspect, in particular, a plurality of thin wires are molded on a terminal block, and the thin lines are drawn out from the terminal block and connected to a wiring pattern, and The terminal and the thin wire drawn out from the side surface of the terminal block are arranged at the same position even if the second winding is wound differently.

With the above structure, in addition to the effect of the present invention as set forth in claim 2, since the terminal and the lead-out position of the thin wire pulled out from the side surface of the terminal block are at the same position, the second winding is set to a different number of turns. Also, when the second winding and the thin wire are molded on the terminal block, the mold shape used for molding can be the same shape, which simplifies the production process,
The yield can be improved.

According to a fourth aspect of the present invention, in the invention according to the third aspect, in particular, six differently shaped metal flat plate coils and three differently shaped thin wires to three differently shaped metal flat plate coils. And two thin wires of the same shape and two thin wires of different shapes are selected and combined to form the second winding having one, two or three turns. With the above configuration, when the number of turns of the second winding is selected from 1 to 3, the effect of claim 3 can be easily obtained.

According to a fifth aspect of the present invention, in the invention according to the fourth aspect, particularly, when five wiring patterns are used and the number of turns of the second winding is set to one, they are adjacent to each other. In this configuration, the three wiring patterns are connected and two adjacent wiring patterns are connected. With the above configuration, the number of turns of the second winding can be set to one,
It is also possible to carry a large current.

According to a sixth aspect of the present invention, in the invention according to the fourth aspect, particularly when five wiring patterns are used and the number of turns of the second winding is two, It is a configuration in which only one of the wiring patterns adjacent to the wiring pattern is connected. With the above configuration, the number of turns of the second winding can be set to two.

In the invention according to claim 7 of the present invention, in the invention according to claim 4, particularly, when five wiring patterns are used and the number of windings of the second winding is three, they are adjacent to each other. The wiring pattern is not connected. With the above configuration, the number of turns of the second winding can be set to three.

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION The invention described in all the claims will be described below with reference to the drawings using an embodiment of the present invention.

FIG. 1 is a perspective view of a terminal block before molding in which a second winding of a coil device according to an embodiment of the present invention is arranged. FIGS. 2 (a) to 2 (e) are non-attached thin wires of the coil device. 5 is a manufacturing process diagram of the coil body, FIG. 3 is a perspective view of a metal flat plate coil of the coil device formed on a metal frame, FIG. 4 is an exploded perspective view of a second winding when the thin wire of the coil device is attached, and FIG.
FIG. 3 is a perspective view of the coil device before combination of magnetic cores.

1 to 5, a coil device according to an embodiment of the present invention is formed as a thin transformer, and has a winding shaft 11 and a first winding wound flatly on the winding shaft 11.
The winding 12 and the second winding 14 in which a plurality of curved metal flat plate coils 13 are laminated around the winding shaft 11 and mounted on the winding shaft 11.
And the first winding 12 and the second winding 14 to the coil base 1
Terminal block 1 placed in 6 and molded (sealed) with insulating resin
5 and EE type magnetic core 17 combined with this terminal block 15
And a mounting board (not shown) on which the coil body 18 is mounted.

The metal plate coil 13 of the second winding 14 is formed on a metal frame 20 together with a plurality of fine wires 19 and is insert-molded on the terminal block 15. Both ends of the metal plate coil 13 serve as terminals 21. , Terminal block 15
The terminals 21 and the thin wires 19 are drawn out from the side surface 22 in the same direction and are connected to the plurality of wiring patterns 23 arranged on the mounting substrate.

The plurality of wiring patterns 23 are used for the terminal block 15
The side surface 22 of the terminal block 15 while facing the side surface 22 of the terminal block 15.
The second winding 14 is arranged through the terminal 21 by arranging it so as to face the drawing position of the terminal 21 drawn from 2 and connecting or disconnecting the adjacent wiring pattern 23 among the plurality of wiring patterns 23. The number of turns is adjusted.

In particular, even if the number of turns of the second winding 14 is changed, the lead-out positions of the terminal 21 and the thin wire 19 pulled out from the side surface 22 of the terminal block 15 are set to the same position.

At this time, the second of 1 or 2 or 3 times
In order to form the winding 14, from the six different-shaped metal flat-plate coils 13 and the three different-shaped thin wires 19, the three different-shaped metal flat-plate coils 13 and the two similar-shaped thin wires 19 and the two different-shaped wires 19 are formed. The thin wire 19 having a shape is selected and combined to be formed.

Here, when the number of turns of the second winding 14 is set to one, the positional relationship between the metal flat-plate coil 13 and the thin wire 19 is shown in FIG. 4 (the metal frame 20 is omitted), and the mounting board is mounted. The relationship between the five wiring patterns 23 provided is shown in FIG. 5. In the five wiring patterns 23, three adjacent wiring patterns 23 are connected, and two adjacent wiring patterns 23 are connected to each other to connect the terminal block. The terminal 21 of the metal flat-plate coil 13 pulled out from the side surface 22 of
And the thin wire 19 is connected to these wiring patterns 23 to form the second winding 14.

In particular, regarding the positional relationship between the terminals 21 and the fine wires 19 of the metal flat plate coil 13 forming the second winding 14, the terminals 2 drawn out from the side surface 22 of the terminal block 15 will be described.
1 and the thin wire 19 are (a), (b), (c),
(D), (e), (f), (g), (h), (i),
(J), which correspond to each other in FIGS. 4 and 5. Each thin wire 19 is a terminal 2 of the metal plate coil 13.
It functions as a dummy terminal for 1.

In this way, the coil body 18 is mounted on the mounting board to form a coil device.

The operation of the coil device having the above structure will be described below.

With the above structure, the terminals 21 at both ends of the flat metal plate coil 13 forming the second winding 14 are pulled out in the same direction from the side surface 22 of the terminal block 15 and face the side surface 22 of the terminal block 15. Since the terminal 21 is connected to the wiring pattern 23 facing the lead-out position of the terminal 21, the shape of the connection portion is not complicated, and the connection can be made with a simple shape, downsizing can be easily achieved, and connection reliability can be improved.

Particularly, since the number of turns of the second winding wire 14 is adjusted by connecting or disconnecting the adjacent wiring patterns 23 among the wiring patterns 23, it is necessary to arrange a complicated wiring pattern 23 on the mounting substrate. Therefore, it is possible to further reduce the size and improve the connection reliability, and it is possible to prevent the loss of the DC resistance due to the routing of the wiring pattern 23 and the like.

Since a plurality of thin wires 19 are molded on the terminal block 15 and are drawn from the terminal block 15 and connected to the wiring pattern 23, the thin wires 19 are dummy with respect to the terminals 21 at both ends of the metal plate coil 13. It can be used as a terminal 21 for.

In particular, since the terminals 21 and the thin wires 19 drawn out from the side surface 22 of the terminal block 15 are at the same drawing position, even if the second winding 14 is wound differently,
When the winding 14 and the thin wire 19 are molded on the terminal block 15, the mold used for molding (with respect to the direction of the side surface 22 of the terminal block 15) can have the same shape, and the production can be performed. The process can be simplified and the yield can be improved.

Further, from six differently shaped metal flat plate coils 13 and three differently shaped thin wires 19 to three differently shaped metal flat coil 13 and two same shaped thin wires 19 and 2.
Since two fine wires 19 having different shapes are selected and combined to form the second winding 14 having one, two or three turns, the mold used for molding has the same shape. Therefore, the production process can be easily simplified and the yield can be improved.

Then, five wiring patterns 23 are formed on the mounting board, and when the number of turns of the second winding 14 is set to one, the three adjacent wiring patterns 23 are connected and two adjacent wiring patterns 23 are connected. Since the wiring pattern 23 is connected, the number of turns of the second winding 14 can be easily set to one. At this time, the three metal flat-plate coils 13 are stacked to form the second winding 14 having a single winding number, so that the cross-sectional area of the second winding 14 is substantially increased and a large current may be passed. it can.

As described above, according to the embodiment of the present invention, the terminal 21 and the wiring pattern 23 of the metal plate coil 13 are provided.
The shape of the connection portion with and does not become complicated, and the connection can be made with a simple shape, so that the size can be easily reduced and the connection reliability can be improved.

Particularly, by connecting or disconnecting the adjacent wiring patterns 23 among the wiring patterns 23,
It is possible to prevent loss of DC resistance due to wiring of the wiring pattern 23 and the like.

Further, according to the usage of the second winding 14,
The number of turns of the second winding 14 can be freely selected, and even if the number of turns of the second winding 14 is changed, the terminal block 1
The mold shapes used for the mold of No. 5 can be the same mold shape, and the production process can be simplified and the yield can be improved.

Further, when the number of turns of the second winding 14 is set to 1, the three metal flat-plate coils 13 are laminated to form the second winding 14 having one turn, so that a large current is generated. It can also be energized.

Although the number of turns of the second winding 14 is one in the embodiment of the present invention, the number of turns of the second winding 14 may be two or three. When the number of turns of the second winding 14 is set to two, as shown in FIGS. 6 and 7, using the five wiring patterns 23, only one wiring pattern 23 adjacent to the central wiring pattern 23 is used. Are connected.

When the number of windings of the second winding 14 is set to three, as shown in FIGS. 8 and 9, five wiring patterns 23 are used and the adjacent wiring patterns 23 are not connected.

Regarding the positional relationship between the terminals 21 and the thin wires 19 of the flat metal plate coil 13 forming the second winding 14, the terminals 21 and the terminals 21 drawn out from the side surface 22 of the terminal block 15 are the same as in FIGS. 4 and 5. The thin wire 19 is (a),
(B), (c), (d), (e), (f), (g),
(H) and correspond to each other in FIGS. 6 and 7, 8 and 9.

The terminals 21 of the second winding 14 may or may not have different widths, and may be selected according to the usage of the second winding 14.

[0049]

As described above, according to the present invention, the terminals at both ends of the metal plate coil forming the second winding are pulled out in the same direction from the side surface of the terminal block and face the side surface of the terminal block. Since the terminal is connected to the wiring pattern facing the terminal extraction position, the shape of the connection part does not become complicated, the connection can be made with a simple shape, the size can be easily reduced, and the coil device with improved connection reliability is provided. can do.

[Brief description of drawings]

FIG. 1 is a perspective view of a terminal block before molding in which a second winding of a coil device according to an embodiment of the present invention is arranged.

FIG. 2A to FIG. 2E are manufacturing process diagrams of a coil main body of the same coil device without thin wires attached.

FIG. 3 is a perspective view of a metal plate coil of the coil device, which is formed on a metal frame.

FIG. 4 is an exploded perspective view of a second winding when the coil device is attached with a thin wire.

FIG. 5 is a perspective view of the coil device before combination of magnetic cores.

FIG. 6 is an exploded perspective view of another second winding when the coil device is attached with a thin wire.

FIG. 7 is a perspective view of the coil device before combination of magnetic cores.

FIG. 8 is an exploded perspective view of another second winding of the coil device when the thin wire is attached.

FIG. 9 is a perspective view of the coil device before combination of magnetic cores.

FIG. 10 is a manufacturing process diagram of a thin transformer body as a conventional coil device.

FIG. 11 is a perspective view of a terminal block in which a secondary main winding of the thin transformer body is arranged.

[Explanation of symbols]

11 reel 12 First winding 13 Flat metal coil 14 Second winding 15 terminal block 16 coil base 17 magnetic core 18 coil body 19 thin lines 20 metal frame 21 terminals 22 sides 23 Wiring pattern

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Katsunori Omura             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd. F-term (reference) 5E043 EA01 EB01

Claims (7)

[Claims] 1. A winding shaft, a first winding wound around the winding shaft, and a second winding mounted on the winding shaft by laminating a plurality of curved metal flat plate coils around the winding shaft. A coil base having at least a terminal block formed by molding the second winding, and a mounting board on which the coil main body is mounted, and the metal flat-plate coil of the second winding has terminals at both ends. In addition, the terminals are pulled out in the same direction from the side surface of the terminal block, and are connected to a plurality of wiring patterns arranged on the mounting board. The plurality of wiring patterns are opposed to the side surfaces of the terminal block, and the terminal block is Of the plurality of wiring patterns by connecting or disconnecting adjacent wiring patterns among the plurality of wiring patterns so that the number of windings of the second winding can be increased through the terminals. Adjusted coil equipment Place 2. The coil device according to claim 1, wherein a plurality of thin wires are molded on a terminal block and are drawn from the terminal block and connected to a wiring pattern. 3. A terminal which is formed by molding a plurality of thin wires on a terminal block and is connected to a wiring pattern by being drawn out from the terminal block, and which is drawn out from the side surface of the terminal block even when the second winding is wound differently. The coil device according to claim 1, wherein the drawing positions of the thin wires are the same position. 4. A metal flat coil having six different shapes and three thin wires having different shapes, three metal flat coils having different shapes, two thin wires having the same shape and two thin wires having different shapes are selected and combined. The coil device according to claim 3, wherein the second winding is wound once, twice or three times. 5. When five wiring patterns are used and the number of turns of the second winding is set to one, three adjacent wiring patterns are connected and two adjacent wiring patterns are connected. Item 4. The coil device according to Item 4. 6. The wiring pattern according to claim 4, wherein when five wiring patterns are used and the number of turns of the second winding is two, only one wiring pattern adjacent to the central wiring pattern is connected. Coil device. 7. The coil device according to claim 4, wherein when five winding patterns are used and the number of turns of the second winding is three, the adjacent wiring patterns are not connected.