JP2003092222A - Transformer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transformer of a power source device wherein the rotation of a coil component relative to a middle leg of a core is prevented using a simple structure, and a clearance which causes troubles such as vibration and abnormal noise is not formed between the middle leg of a core and the coil component. SOLUTION: A transformer 1 which enables a rotation preventive means to be installed between a middle leg 11a of a core 10 and a coil component 20 for preventing them from rotating, can be obtained by making the cross-section of the middle leg 11a of the core 10 and a shape of a core insertion hole 22 of a coil component formed into non-circular shapes, such as oval shapes of almost the equal sizes and rounded polygon.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transformer used as a main transformer of a power supply device.

[0002]

2. Description of the Related Art A transformer is a voltage, current, or
Specifications such as shape and number of outputs vary widely. In addition, conventionally,
Most transformers used as main transformers for multi-output power supplies are designed and manufactured after determining circuit specifications. Therefore, in the conventional transformer, it takes a long time from design to delivery and the design cost is high. In addition, the conventional transformer was not designed to be reused after assembly, and therefore could not be disassembled or replaced.

Therefore, the applicant of the present application has filed Japanese Patent Application Laid-Open No. 10-107.
Proposed a transformer as disclosed in 49. This transformer uses flat-type and sheet-type insulated coil components that are separate units with the primary and secondary windings separated, and these coil components are attached to and detached from the core respectively. It has a possible structure. By using such a structure, it is possible to standardize each coil component, and by combining these coil components, it is possible to manufacture transformers with various specifications. Moreover, the use of such a structure facilitated disassembly of the transformer and reuse of components. In addition, by standardizing the coil components, we can provide the desired transformer by simply selecting and combining the coil components that meet the user's specifications from the various coil components prepared in advance, and the period from order receipt to delivery is greatly shortened. It became possible to do.

[0004]

However, the cross-section of the center leg of the core of the transformer and the shape of the core insertion hole of the coil component disclosed in this publication are as follows.
Both were circular. Therefore, when the coil component is rotatable with respect to the center leg of the core like this structure, the efficiency of the work of soldering the conductive wire extended from the coil component to the substrate by the rotation of the coil component is deteriorated. In some cases, the conductor wire or the like soldered to the board may come off.

In order to eliminate such inconvenience, in the above-mentioned transformer, as means for preventing rotation of the coil component with respect to the center leg of the core, a protrusion is provided on the outer periphery of the coil component and a side surface that engages with the protrusion. The opening is provided in the case, and the movement of the coil component in the rotation direction is restricted by the opening of the case to prevent the coil component from rotating. For this reason, the shape of the mold for molding the case, the bobbin, and the like becomes complicated, and it is difficult to change the shape of the coil component and the case.

Further, in the above-mentioned conventional structure, the coil component attached to the core is rotatable before being housed in the case, and when the core and the coil component are housed in the case, the angle of the coil component with respect to the core. Since it had to be adjusted, the work efficiency when storing the coil component and the core in the case was poor.

In view of the above problems, it is an object of the present invention to provide a transformer having a simple structure for preventing rotation between the middle leg of the core and the coil component.

[0008]

To achieve the above object, a transformer of the present invention comprises a primary winding connected to an input side module, a secondary winding connected to an output side module, and a primary winding. And a core that serves as a magnetic core of these coils for strengthening electromagnetic coupling of the secondary winding, wherein the primary winding and the secondary winding are separate and independent insulation It is a coil component, and by inserting the core legs of the coil through the core insertion holes of the coil components, the coil components are adjacent to each other in the axial direction of the core legs. Rotation preventing means for preventing rotation of the coil component with respect to the center leg of the core is provided between the center leg of the core and each coil component.

According to the above construction, it is possible to provide rotation preventing means for preventing the rotation of the core leg and the coil component with a simple structure between the core leg and the coil component. Since it is not necessary to provide any means for preventing the coil component from rotating between them, the degree of freedom in designing the shape of the case, the coil component and the like increases.

Further, when the rotation preventing means is provided, the core insertion hole of the coil component and the cross section of the middle leg of the core inserted through the insertion hole have substantially the same shape and are non-circular, and the insertion hole and It is also possible to use a structure in which the core foot and the core foot are engaged with each other in a substantially non-rotatable manner, and by doing so, between the core foot and the coil component with a simple structure. It becomes possible to provide means for preventing their rotation. At that time, it is preferable that the core insertion hole of each of the coil components and the transverse cross section of the middle leg of the core have a shape in which all corners of an ellipse or a polygon are rounded.

Further, at least one of the coil components is a flat coil in which a flat bobbin is wound with a metal material, or a sheet coil in which a metal coil is coated with an insulating material. It can be a coil.

Other objects, configurations and effects of the present invention will become more apparent from the following description of the embodiments with reference to the drawings.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The transformer of the present invention will be described in detail below with reference to the preferred embodiments shown in the accompanying drawings.

1 to 5 are exploded perspective views showing a structure of an embodiment of a transformer of the present invention, a top view of a core part of the transformer of the present invention, a top view of a flat plate type coil of the transformer of the present invention, and a book. It is a side view of a bobbin used for a flat plate type coil of a transformer of the invention, and a top view showing a state where a core of a transformer of the present invention and a flat plate type coil are assembled. In addition, FIG.
FIG. 7 is a top view of a core component in which the cross-sectional shape of the middle leg of the core, which is a modified example of the core of the transformer of the present invention, has a shape with rounded square corners.

First, the overall configuration of the transformer 1 of the present invention will be described with reference to FIG. As shown in FIG. 1, a transformer 1 according to the present invention includes a primary winding and a secondary winding which are independent coil components 20, a core 10 serving as a magnetic core of the coil component 20, and the coil component. 20 and core 1
0 for supporting the coil component 2 and the coil component 2 from the case 30 by being attached to the case 30 and pressing the core component 12 toward the case 30.
0 and the pressing member 40 that prevents the core 10 from falling off.

Hereinafter, these configurations will be described in detail. As shown in FIG. 1, the core 10 includes core parts 11 and 12 formed by molding a magnetic material such as amorphous or ferrite.
The core component 12 is placed on the core component 11, and a closed magnetic circuit is formed by combining these components.

As shown in FIG. 2, the core component 11 is a center leg 11a which is a core of the coil component 20.
And an outer foot (side pole) 11b standing upright on both sides of the inner foot 11a in parallel with the inner foot 11a and a base portion 11c integrally provided under the outer foot 11a.
The cross section of 1a is elliptical.

As shown in FIGS. 3 and 4, the coil component 20 includes a flat plate type coil 28 in which a conductive wire 23 is wound around a flat plate type bobbin 21 formed of an insulating material such as resin.
As shown in FIG. 1, a sheet-type coil 29 is formed by applying an insulating coating 25 of an insulating material to a sheet-shaped metal coil portion 24, wherein the flat-plate coil is the primary winding of the power supply device and the sheet. The mold coil is used as a secondary winding of a power supply device.

Core insertion holes 22 of these coil components 20
Has an elliptical shape having substantially the same shape as the cross section of the middle foot 11a of the core 10, and the middle foot 11a and the core insertion hole 22 are engaged with each other with substantially no clearance.
By using such a structure, when the core 10 and the coil component 20 are assembled, rotation of the coil component 20 with respect to the middle leg 11a of the core 10 is restricted, and as shown in FIG. A gap is not formed between the middle leg 11a of the coil 10 and the conductor wire 23 wound around the coil component 20.

The case 30 is formed of resin or the like into a substantially box shape, and as shown in FIG. 1, an opening 31 is formed on the upper surface and a side surface opening 32 is formed on the side surface to extend the conductor wire 23 of the coil component 20. have. As shown in FIG. 1, the side surface openings 32 are provided on opposite side surfaces of the case 30, and the conducting wire of the coil component 20 can be extended from each side surface.

In the vicinity of the opening 31 of the case 30, that is, at the upper portions of the opposite side surfaces where the side surface opening 32 is not provided, the hole 4 which will be described later is provided in the pressing member 40.
A protrusion 33 that engages with 1 is formed. A mounting member 34 for mounting the transformer 1 on a substrate or the like is provided on the bottom surface of the case 30.

The pressing member 40 is formed by bending a metal plate material, and has hole portions 41 at both ends for engaging with the protrusion 33 of the case. The pressing member 40 includes the core 10 and the coil component 2 after the core 10 and the coil component 20 are assembled to the case 30.
It is a member for preventing the falling of 0 and pressing the core part 12 toward the case 30 by the bending of the core part 12 so that the core parts 11 and 12 are brought into close contact with each other.

The method of assembling the transformer 1 having the above-described structure according to the embodiment of the present invention will be described in detail below.

First, the middle leg 11a of the core component 11 is inserted into the core insertion hole 22 of the coil component 20 to assemble the core 10 and the coil component 20. At this time, the direction of the conductor wire 23 extending from the flat coil 20a used for the primary winding is opposite to the direction of the conductor wire 23 extending from the sheet coil 20b used for the secondary winding. By assembling as described above, even if the distance between the primary substrate connected to the primary winding and the secondary substrate connected to the secondary winding is large, it is possible to wire the conductive wire without waste.

Next, the assembled core 10 and coil component 20 are placed in a case 30, and the pressing member 40 is attached to the case 3.
The protrusion 33 provided on the case 30 and the hole 41 provided on the pressing member 40 are engaged with each other. By doing so, the pressing member 40 does not come off from the case 30 unless an external force is applied. At this time, it is preferable to attach the core component 11 so that the core component 11 is on the case 30 side and the core component 12 is on the pressing member 40 side, so that the coil component 20 can be easily attached to and detached from the core component 11. Become.

Transformer 1 assembled as described above
Is attached to a substrate or the like, and the conducting wire 23 extending from the coil component 20 of the transformer 1 is attached to a predetermined circuit by soldering or the like.

In the present embodiment, the cross section of the middle leg 11a of the core 10 is elliptical, but as shown in FIG. 6, the shape of the middle leg 11a of the core component 11 'is a square or the like. It is also possible to make the corners of the prism rounded, and even when such a shape is used, rotation between the middle leg 11a of the core 10 'and the coil component is prevented as in the case of the above ellipse. It is possible to Further, in the embodiment shown in FIG. 5, the cross section of the center leg of the core is a square with rounded corners, but the present invention is not limited to this embodiment, and a core having a polygonal cross section without rounded corners is used. Even when the middle foot is used, it is possible to prevent the rotation between the middle foot of the core and the coil component.

Further, in the present embodiment, the plurality of flat plate type coils 20a are used as the primary winding and the plurality of sheet type coils 29 are used as the secondary winding. However, the present invention is not limited to this embodiment, and the primary type coil is used. The sheet type coil as a winding,
It is also possible to use the flat plate type coil as the secondary winding. Further, the number of primary windings and the number of secondary windings each need to be at least one, and the number is not limited to that in the present embodiment. Further, although the flat plate type coil 20a and the sheet type coil 29 are used as the coil component 20 in the present embodiment, it is not limited to this embodiment, and coil components of various shapes can be used. Also, it is possible to obtain the same effect as that of the present invention.

Finally, it goes without saying that the present invention is not limited to the above-mentioned embodiments, and various changes and improvements can be made within the scope described in the claims.

[0030]

As described above, according to the present invention, it is possible to provide a rotation preventing means for preventing mutual rotation between the middle leg of the core and the coil component with a simple structure. Will be realized.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a structure of an embodiment of a transformer of the present invention.

FIG. 2 is a top view of the core component of the transformer of the present invention.

FIG. 3 is a top view of a flat plate type coil of the transformer of the present invention.

FIG. 4 is a side view of a bobbin used in the flat coil of the transformer of the present invention.

FIG. 5 is a top view showing a state in which a transformer core of the present invention and a flat-plate coil are assembled.

FIG. 6 is a top view of a core component in which the cross-section of the middle leg of the core, which is a modified example of the core of the transformer of the present invention, has a shape with rounded square corners.

[Explanation of symbols]

1 transformer 10 cores 11 core parts 11a Middle foot 11b outside foot 11c base 12 core parts 20 coil parts 20a Flat type coil 20b sheet type coil 21 bobbins 22 Core insertion hole 23 conductors 24 coil 25 Insulation coating 30 cases 31 opening 32 Side opening 33 protrusions 34 Mounting member 40 Pressing member 41 hole

Claims (6)

[Claims] 1. A primary winding connected to an input-side module, a secondary winding connected to an output-side module, and a primary winding and a secondary winding for strengthening electromagnetic coupling of these coils. A core serving as a magnetic core of the transformer, wherein the primary winding and the secondary winding are separate and independent insulating coil components, and the core is inserted into the core insertion hole of each coil component. In a transformer in which each coil component is adjacent to each other in the axial direction of the core leg by inserting the inner leg, a rotation prevention means for preventing rotation of the coil component with respect to the core leg of the core A transformer that is provided between the middle leg and each coil component. 2. The rotation preventing means has a core insertion hole of a coil component and a cross section of a middle leg of the core which is inserted through the insertion hole and have substantially the same shape and a non-circular shape. The transformer according to claim 1, wherein the middle foot and the middle foot are engaged with each other in a substantially non-rotatable state. 3. The transformer according to claim 2, wherein the core insertion hole of each coil component and the transverse cross section of the middle leg of the core are elliptical. 4. The core insertion hole of each of the coil components and the transverse section of the middle leg of the core are formed by rounding all corners of a polygon, respectively. Trance. 5. The transformer according to claim 1, wherein at least one of the coil components is a flat coil in which a metal material is wound around a flat bobbin. 6. The sheet coil according to claim 1, wherein at least one of the coil components is a sheet coil formed by coating a sheet-shaped metal coil with an insulating material.
The transformer according to any one of 1 to 4.