JP2013206900A - Transformer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transformer that can be made compact and short on the whole even when partition portions are formed between a plurality of winding portions.SOLUTION: A plurality of bobbins 10 which each have a first terminal mount portion 13 formed at one end of a rectangular cylindrical winding portion 12 wound with a coil 13 around its outer periphery so as to connect with one side portion 12a thereof, has a second terminal mount portion 14 formed at the other end so as to connect with a side portion 12b opposed to the one side portion, and also has a coil bundle terminal 17 implanted in a side end projecting to outside the winding portion in a direction orthogonal to axis directions of the first and second terminal mount portions are arranged having their axes aligned with one another. The first terminal mount portion 13 of one of adjacent bobbins 10 is positioned at an outer periphery of the winding portion 12 of the other bobbin 10, and the second terminal mount portion 14 of the other bobbin 10 is positioned at an outer periphery of the winding portion 12 of the one bobbin 10, and connected.

Description

  The present invention relates to a transformer incorporated in a power supply circuit for boosting, and more particularly to a transformer that achieves a low profile and a small size.

  In general, in a transformer having a high output voltage and a plurality of output systems, or a transformer using a fine wire as a winding of a coil, a plurality of partition portions 2 are provided on a bobbin 1 as shown in FIG. A plurality of independent winding sections 3 are partitioned, and a coil (not shown) is wound around each winding section 3. In such a case, a structure in which a terminal 4 that ties the end of the coil of the winding portion 3 is implanted in each partition portion 2 is often employed.

  According to the transformer configured as described above, since the plurality of winding portions 3 are arranged on the same axis, it is possible to reduce the height and to compare with the case where the winding portions are arranged in parallel. Thus, there is an advantage that the width dimension can be reduced.

  However, in the above-described conventional transformer, since the terminals 4 are implanted in the partition portion 2, it is necessary to ensure a sufficient thickness dimension for holding the terminals 4 in the partition portion 2. For this reason, in particular, when the number of output systems, that is, the number of independent winding portions 3 is increased, the number of partition portions 2 is correspondingly increased. As a result, the length dimension in the longitudinal direction is excessively large. There was a problem of becoming.

  Note that a transformer having such a configuration is also disclosed in Patent Document 1 below, for example.

JP-A-2005-223125

  The present invention has been made in view of the above circumstances, and even when a partition portion is formed between each of a plurality of winding portions, the transformer capable of realizing a reduction in size and a low profile as a whole. It is a problem to provide.

  In order to solve the above-described problem, a transformer according to the present invention described in claim 1 includes a first and a second extending axially at both ends of a rectangular cylindrical winding portion having a coil wound around an outer periphery thereof. The bobbin includes a plurality of bobbins in which a second terminal mounting portion is integrally formed. The bobbin has the first terminal mounting portion formed on one side of one end of the winding portion. The second terminal mounting portion is formed on the side of the other end facing the one side, and the windings are formed on the first and second terminal mounting portions in a direction perpendicular to the axial direction. A side end projecting outwardly of the part is formed, a binding terminal around which the end of the coil is wound is implanted in the side end, and a plurality of the bobbins are connected to each other The first terminal mounting portion of one of the adjacent bobbins is disposed on the other side while being arranged with the axes aligned. It is located on the outer periphery of the winding part of the bobbin, and is connected with the second terminal mounting part of the other bobbin being located on the outer periphery of the winding part of the one bobbin. Is.

  According to a second aspect of the present invention, in the first aspect of the present invention, the plurality of bobbins are formed in the same shape.

  Furthermore, the invention according to claim 3 is the invention according to claim 1 or 2, wherein a partition plate for partitioning a winding region of the coil is formed on the outer periphery of the winding portion of the bobbin. The partition plate at the position where the first terminal mounting portion or the second terminal mounting portion of the adjacent bobbin is disposed has a height dimension set smaller than that of the other partition plates. It is a feature.

  In the invention according to any one of claims 1 to 3, each of the winding portions can be partitioned from each other by a plurality of independent bobbins, and the first terminal mounting portion of one adjacent bobbin is Since it is located on the outer circumference of the winding part of the other bobbin and conversely the second terminal mounting part of the other bobbin is located on the outer circumference of the winding part of one bobbin, The binding terminals can be arranged between the bobbins without increasing the size.

  Moreover, the first and second terminal mounting portions are formed with side end portions projecting outward from the winding portion in a direction orthogonal to the axial direction, and the above-mentioned tangled terminals are implanted in the side end portions. Therefore, even if the first and second terminal mounting portions are positioned on the outer periphery of the winding portion of each adjacent bobbin, the adjacent binding terminals or the binding terminal and the winding portion Will not interfere.

  According to the invention described in claim 2, since the transformer can be configured by connecting a plurality of bobbins having the same shape, the number of winding portions is appropriately changed as necessary. Can respond.

  Further, in the invention according to claim 3, when an insulating partition plate for partitioning the coil winding region is formed on the outer periphery of the winding portion of the bobbin, the first terminal mounting of the adjacent bobbin Since the height dimension of the partition plate at the position where the portion or the second terminal mounting portion is disposed is smaller than the other partition plates, the first and second terminal mounting portions are separated from the partition plate. By avoiding interference, it becomes possible to further reduce the size and height as a whole.

The bobbin used for one Embodiment of the transformer which concerns on this invention is shown, (a) is the perspective view seen from the top, (b) is the perspective view seen from the bottom. It is a front view which decomposes | disassembles and shows the connection state of the bobbin of FIG. FIG. 3 is a perspective view of FIG. 2. It is a front view which shows the transformer of the said one Embodiment. It is a perspective view from the plane side of FIG. It is a longitudinal cross-sectional view of FIG. It is a cross-sectional view of FIG. It is a perspective view from the front side which shows other embodiment of this invention. FIG. 9A is an arrangement diagram of bobbins and terminals in the transformer shown in FIG. 8, and FIG. 9B is an arrangement diagram of bobbins and terminals in the conventional transformer. It is a top view which shows the conventional transformer.

2 to 7 show an embodiment of a transformer according to the present invention, and FIG. 1 shows a shape of a bobbin used in the transformer.
As shown in FIG. 1, the bobbin 10 has a rectangular cylindrical winding portion 12 with flanges 11 formed at both ends, and extends in the axial direction at one end portion of the winding portion 11. The first terminal mounting portion 13 integrally formed and the second terminal mounting portion 14 integrally molded so as to extend in the axial direction at the other end of the winding portion 12. It is a thing.

Here, the winding portion 12 is formed by winding the coil 15, and a partition plate 16 for preventing edge discharge of the coil 15 is integrally formed on the outer periphery thereof at equal intervals in the axial direction. ing.
The first and second terminal mounting portions 13 and 14 are each formed integrally with the flange 11 of the bobbin 10, and are flat plate portions 13a and 14a extending in the axial direction, and the flat plate portions 13a and 14a. It is formed in a shape provided with prismatic terminal blocks 13b and 14b erected on both side ends.

  And the 1st and 2nd terminal mounting part 13 is mutually formed in the same dimension. However, as for the 1st terminal mounting part 13, the flat plate part 13a is formed in the one side 12a side of the long side in the winding part 12 of a rectangular tube shape. On the other hand, the 2nd terminal mounting part 14 is formed in the other side 12b side in which the flat plate part 14a opposes the said one side 12a of the coil | winding part 12. FIG. Incidentally, these flat plate portions 13 a and 14 a are formed so that the surfaces thereof are flush with the inner wall of the through hole of the winding portion 12. As a result, the first and second terminal mounting portions 13 and 14 are formed at positions that are 180 ° symmetrical about the axis of the winding portion 12.

  Further, the terminal block 13b is erected from the flat plate portion 13a toward the other side 12b facing the winding portion 12, and the terminal block 14b is arranged on the side 12a side facing the winding portion 12 from the flat plate portion 14a. It is erected towards. Here, the terminal blocks 13b and 14b are formed such that about ½ of the extension length of the flat plate portions 13a and 14a protrudes in a prismatic shape at the tip portions in the axial direction of the flat plate portions 13a and 14a, respectively. ing.

And the binding terminal 17 is each planted by these terminal blocks 13b and 14b. These binding terminals 17 are implanted so that both end portions thereof protrude from the front end surface and the base end surface of the terminal blocks 13b and 14b (that is, the back surfaces of the flat plate portions 13a and 14a). An end portion of the coil 15 wound around the adjacent winding portion 12 is entangled with an exposed portion from one of the base end surfaces.
Further, on the rear side in the axial direction of these terminal blocks 13b and 14b, contact portions 13c and 14c protruding from the flat plate portions 13a and 14a by a predetermined height are formed.

  As shown in FIGS. 2 to 7, in this transformer, two bobbins 10 having the above-described configuration are arranged with the axes of the winding portions 12 aligned with each other, and one adjacent bobbin 10 first terminal mounting portions 13 are positioned on the outer periphery of the winding portion 12 of the other bobbin 10, and the second terminal mounting portions 14 of the other bobbin 10 are positioned on the outer periphery of the winding portion 12 of the one bobbin 10. Are connected to each other.

  Here, the flange 11 and the partition plate 16 of the other bobbin 10 on which the flat plate portion 13 a of the first terminal mounting portion 13 of the one bobbin 10 is positioned have respective heights of the first terminal mounting portion 13. It is formed as low as the thickness. Similarly, the flange 11 and the partition plate 16 of one bobbin 10 where the flat plate portion 14a of the second terminal mounting portion 14 of the other bobbin 10 is positioned have the respective heights of the second terminal mounting portion 14. It is formed as low as the thickness.

  In addition, the two bobbins 10 are configured such that the contact portion 13c in the first terminal mounting portion 13 of one bobbin 10 contacts the contact portion 14c in the second terminal mounting portion 14 of the other bobbin 10. It is positioned. That is, the contact portions 13c and 14c contact the flange 11 and the partition plate 16 formed so that the flat plate portions 13a and 14a of the first and second terminal mounting portions 13 and 14 are low on the outer periphery of the adjacent bobbin 10. In such a position, the height is set such that the opposing surfaces of the contact portions 13c and 14c contact each other. As a result, the two bobbins 10 are connected by engaging the terminal blocks 13b and 14b and the contact portions 13c and 14c, which are L-shaped opposite to each other.

  Then, as shown in FIGS. 4 to 7, a core that forms a closed magnetic circuit is disposed in the outer periphery of the bobbin 10 and in the through hole. In this core, a pair of opposed E-shaped cores 18 have their middle legs 18a inserted into the through holes of each bobbin 10, and a pair of outer legs 18b are arranged along the outer circumference of one bobbin 10, respectively. These are formed in a letter shape as a whole by bringing the opposing surfaces into contact with each other.

  According to the transformer having the above configuration, the winding portions 12 around which the coils 15 are wound can be separated from each other by the two bobbins 10, and the first terminal mounting portion of one of the bobbins 10 can be divided. 13 is positioned on the outer periphery of the winding portion 12 (coil 15) of the other bobbin 10, and conversely, the second terminal mounting portion 14 of the other bobbin 10 is turned to the winding portion 12 (coil 15) of the one bobbin 10. Therefore, it is possible to dispose a plurality of binding terminals 17 between the bobbins 10 without increasing the length in the longitudinal direction.

  In addition, the first and second terminal mounting portions 13 and 14 are formed with side end portions projecting outward from the winding portion in a direction orthogonal to the axial direction, and terminal blocks 13b are formed on the side end portions. 14b is erected and the binding terminal 17 is planted, so that the first and second terminal mounting portions 13 and 14 are positioned on the outer periphery of the winding portion 12 of the adjacent bobbin 10, respectively. However, the adjacent binding terminals 17 or the binding terminals 17 do not interfere with the winding portion 12 (coil 15).

  Moreover, since both ends of the binding terminal 17 are protruded from the front end surface and the base end surface of the terminal blocks 13b and 14b (back surface side of the flat plate portions 13a and 14a), when winding the coil 15, It becomes possible to tie the end portion to the end portion on the side suitable for work.

  Of the insulating partition plate 16 formed on the outer periphery of the winding portion 12 of the bobbin 10, the position where the first terminal mounting portion 13 or the second terminal mounting portion 14 of the adjacent bobbin 10 is disposed. Since the height dimension of the partition plate 16 and the flange 11 is made smaller than the height dimension of the other partition plates 16, the first and second terminal mounting portions 13 and 14 are connected to the partition plate 16 and the flange 11. As a result, the overall size can be further reduced in size and height.

  Furthermore, the terminal blocks 13b and 14b are erected on the front end side of the side end portions of the flat plate portions 13a and 14a of the first and second terminal mounting portions 13 and 14, and on the rear end side of the terminal blocks 13b and 14b, By forming the lower contact portions 13c and 14c, the portions that engage with each other when the two bobbins 10 are combined are formed in opposite L-shapes. The positioning and connection of the two bobbins 10 can be performed.

In addition, since this transformer can be configured by connecting bobbins 10 having the same shape, the number of winding portions can be appropriately changed as needed.
For example, as in another embodiment shown in FIG. 9A, three bobbins 10 having the same shape are arranged with their axes aligned with each other, and as described above, one of the adjacent bobbins 10 The first terminal mounting portion 13 is positioned on the outer periphery of the winding portion 12 of the other bobbin 10, and the second terminal mounting portion 14 of the other bobbin 10 is positioned on the outer periphery of the winding portion 12 of the one bobbin 10. If they are connected, a transformer having a winding portion 12 around which six independent coils 15 are wound and a binding terminal 17 of each coil 15 between each bobbin 10 can be configured.

  Incidentally, as shown in FIG. 9 (b), in the same manner as the conventional one shown in FIG. 10, six independent winding portions 3 are arranged on the bobbin 1 with the partition portion 2 interposed therebetween. Compared with the transformer in which the terminal 4 that wraps the end of the coil of the winding portion 3 is installed in the partition portion 2, according to the transformer according to the present invention shown in FIG. The dimensions can be shortened by approximately 6 mm.

DESCRIPTION OF SYMBOLS 10 Bobbin 11 Flange 12 Winding part 12a One side part 12b Opposite side part 13 1st terminal mounting part 14 2nd terminal mounting part 15 Coil 16 Partition plate 17 Tying terminal

Claims (3)

Provided with a plurality of bobbins in which first and second terminal mounting portions each extending in the axial direction are integrally formed at both ends of a rectangular cylindrical winding portion around which a coil is wound on the outer periphery,
The bobbin has the first terminal mounting portion formed on one side of one end of the winding portion, and the second side on the side of the other end of the winding facing the one side. A terminal mounting portion is formed, and side end portions that project outward from the winding portion in a direction orthogonal to the axial direction are formed in the first and second terminal mounting portions. A tie terminal around which the end of the coil is wound is implanted in the part,
The plurality of bobbins are arranged so that their axes coincide with each other, and the first terminal mounting portion of one adjacent bobbin is positioned on the outer periphery of the winding portion of the other bobbin, A transformer characterized in that the second terminal mounting portion of the other bobbin is connected to the outer periphery of the winding portion of the one bobbin.   The transformer according to claim 1, wherein the plurality of bobbins are formed in the same shape.   A partition plate for partitioning the winding region of the coil is formed on the outer periphery of the winding portion of the bobbin, and the first terminal mounting portion or the second terminal mounting portion of the adjacent bobbin is disposed. The transformer according to claim 1 or 2, wherein the partition plate at a position to be placed is set to have a height dimension smaller than that of the other partition plate.

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