JP5187248B2 - Winding parts - Google Patents

Description

  The present invention relates to a winding component in which a coil is wound around a drum core and used as a power inductor, a choke coil or the like.

  As a basic structure of a winding component used as an inductor or the like, an open magnetic circuit is known in which a coil is wound around the outer periphery of a drum-type ferrite core and a gap between the ferrite core is opened. Yes.

  On the other hand, such a winding component is mounted on a wiring board such as a printed wiring board as a part of a normal circuit component. For this reason, in the open magnetic circuit type winding component, there is a possibility that the magnetic flux leaking from the periphery of the flange has an adverse effect on other electronic components in the vicinity. In addition, since the inductance characteristics tend to be low, there is a disadvantage that the coil wire diameter must be reduced and the number of windings must be increased. As a result, it is difficult to flow a large current. There was also a point.

  Therefore, in the following Patent Documents 1 and 2, a coil is wound around the outer periphery of the drum-type core, and the coil is surrounded by a cylindrical material made of a magnetic material between the flanges of the drum-type core. By providing a core, a closed magnetic circuit type inductor or coil component using the cylindrical core as a magnetic flux path has been proposed.

  According to such a winding component, there is an advantage that leakage of magnetic flux can be suppressed by the cylindrical core, and an inductance value can be increased by a closed magnetic circuit formed by the cylindrical core.

JP 2003-115409 A JP 2007-67081 A

  However, in the above-described conventional winding parts, with the recent high-density mounting on the pudding wiring board, a drum-type core having a flange diameter of several millimeters is also frequently used. . For this reason, it is extremely difficult to manufacture the cylindrical core having a small diameter and a thin wall corresponding to the drum core.

  In addition, since the cylindrical core surrounds the winding wound around the outer periphery of the drum-type core body, when it comes into contact with the winding, the problem of conduction short circuit does not occur. Therefore, it is necessary to form a Ni-based ferrite core having a surface resistance equivalent to that of a drum-type core and thus having a low magnetic permeability (see, for example, Patent Document 1). For this reason, there is a limit to the effect of improving the inductance value due to the formation of the closed magnetic circuit.

  The present invention has been made in view of the above circumstances, and can easily cope with the demand for miniaturization, suppress leakage of magnetic flux, and obtain desired electrical and magnetic characteristics. It is an object of the present invention to provide a partially closed magnetic circuit type winding component.

In order to solve the above-described problem, the winding component according to claim 1 is a plate-like member made of a material having a higher permeability than the drum core around the drum core around which a coil is wound around the outer periphery of the body. Alternatively, the drum-shaped partially closed magnetic path forming member is formed at a position spaced from the flange so as to form a closed magnetic path through a gap with a part of the outer periphery of the flange formed at both ends of the drum core. are arranged along the axial direction of the core Ri name, and is the center the through hole of the rectangular plate-shaped frame member having an insulating property is formed, the drum-type core together provided on the through hole, the frame Terminal portions to which the end portions of the coil are connected are arranged at two corners on the mounting surface side of the member, and the corners of the frame member between the corners or between the corners are not arranged. And a hole is formed in the hole. Closed magnetic path forming member is one which is characterized that you have been inserted.

  The invention according to claim 2 is the invention according to claim 1, wherein the partially closed magnetic path forming member is partially cylindrical, polygonal, or flat, or along the outer periphery of the flange. It is formed in the shape of a circular arc plate.

Furthermore, the invention according to claim 3 is the invention according to claim 1 or 2 , wherein the hole formed in the frame member has an inner dimension smaller on the upper surface side than the mounting surface side of the frame member. By being formed, the partial closed magnetic path forming member is provided with a function of preventing the partial closed magnetic path forming member from coming off to the upper surface side.

The invention according to claim 4 is the invention according to any one of claims 1 to 3, wherein the opening on the mounting surface side of the hole into which the partially closed magnetic path forming member is inserted is the terminal. It is characterized by being sealed by a part.

In the winding part according to any one of claims 1-4, around the drum core, a plate-like or columnar portion closed magnetic path forming member, the outer periphery of the flange portion formed at both ends of the drum core Since the closed magnetic circuit is formed so as to form a closed magnetic circuit via a gap with a part of the magnetic flux, the partial closed magnetic circuit forming member suppresses the leakage of magnetic flux, which has been a problem in the conventional open magnetic circuit winding parts. be able to.

  In addition, since the partially closed magnetic path forming member is disposed along the axial direction at a position away from the flange of the drum core, the partially closed magnetic path forming member is wound around the outer periphery of the drum core. Therefore, it is possible to use a material having a low surface electric resistance value as the partially closed magnetic path forming member.

  As a result, as the partially closed magnetic path forming member, a material having a higher saturation magnetic flux density such as ferrite, iron, permalloy or the like having a higher magnetic permeability than the drum core can be used. In addition to being able to improve, even with a partially closed magnetic circuit, the inductance value and the rated current value can be effectively increased.

  As a result, the target inductance value and rated current value can be easily obtained, and the design margin can be improved. Conversely, when the inductance value and rated current value are the same as the conventional one, the coil wire diameter can be made thicker and the number of windings can be reduced than the conventional product. It is also possible to pass a larger current with a margin.

  Here, as the partial closed magnetic path forming member, as in the invention described in claim 2, a part of the columnar shape, a polygonal column shape such as a triangular column, a quadrangular column, or the outer periphery of a flat plate shape or a drum type core An arcuate plate shape is generally suitable. In addition, the number of arrangement can be appropriately selected from one or more than two.

Further, the upper Symbol drum core, provided in the through hole of the rectangular plate-shaped frame member having an insulating property, the two corners of the mounting surface of the frame member, with each disposing the terminal portion, the The partially closed magnetic circuit forming member is inserted into a corner portion where no terminal portion is disposed or a hole formed between the corner portions.

  For this reason, even if the drum core has a small diameter and a small frame member, the terminal and the partially closed magnetic path forming member can be effectively accommodated in the frame member. In addition, since the partially closed magnetic path forming member is inserted and positioned in the hole formed in the frame member, it is possible to secure a desired insulation distance with high accuracy and obtain stable electrical characteristics. it can.

  In addition, it is possible to reliably prevent the partially closed magnetic path forming member from coming into contact with the coil wound around the drum core, and as a material constituting the partially closed magnetic path forming member, the surface electrical resistance value is A low one can be selected. Furthermore, since the terminal portion is arranged at the corner corner of the frame member, when the end of the coil is tangled and spot-welded, the frame member is wound around the outer periphery of the drum core. The coil can be protected.

Moreover, according to the invention of Claim 3 , it can prevent that the said partial closed magnetic path formation member slips out from the hole of a frame member to the upper surface side.
Here, with respect to the mounting surface side of the frame member, it is possible to prevent the partially closed magnetic path forming member from slipping out by closing the hole with a printed wiring board or the like on which the winding component is mounted.

On the other hand, if the opening portion of the hole portion into which the partially closed magnetic path forming member is inserted is sealed by the terminal portion as in the invention described in claim 4 , the winding at the time of manufacturing or transporting Even before the mounting of the component, it is possible to reliably prevent the partially closed magnetic path forming member from dropping out of the hole, and the structural reliability as the component can be improved.

BRIEF DESCRIPTION OF THE DRAWINGS It shows the 1st Embodiment of this invention, (a) is a front view, (b) is a top view, (c) is a side view. It is a top view which shows the 2nd Embodiment of this invention. It is the perspective view seen from the bottom face side of FIG. FIG. 3 is an enlarged sectional view taken along line AA in FIG. 2. It is a top view which shows the 3rd Embodiment of this invention. It is a top view which shows the 4th Embodiment of this invention. It is a top view which shows the 5th Embodiment of this invention. It is a top view which shows the presence or absence and arrangement | positioning of the partially closed magnetic circuit formation member in the coil | winding components of the Example of this invention, and a comparative example. It is a graph which shows the analysis result of the inductance using the coil | winding components of FIG. It is a top view which shows arrangement | positioning of the partial closed magnetic circuit formation member in the coil | winding components of the other Example of this invention. It is a graph which shows the analysis result of the inductance using the coil | winding components of FIG. 10, and a comparative example.

FIG. 1 shows a basic structure in which a winding component according to the present invention is applied to an inductor as a first embodiment. Reference numeral 1 in the drawing denotes a drum type ferrite core (drum type core).
This drum-type ferrite core 1 has a cylindrical body portion 1a and a flange portion 1b formed on both ends in the axial direction of the body portion 1a with a diameter larger than that of the body portion 1a. Are integrally formed of a material such as a ferrite core.

Then, the coil 2 is wound around the outer periphery of the drum portion 1a of the drum-type ferrite core 1 so as to be positioned radially inward from the flange portion 1b.
Further, in this inductor, two partially closed magnetic path forming members 3 are disposed outside the drum type ferrite core 1.

  These partially closed magnetic path forming members 3 are formed in a columnar shape by a material having a high saturation magnetic flux density such as Mn-based philite having a high magnetic permeability or iron or permalloy. The two partially closed magnetic path forming members 3 are arranged along the axial direction of the drum type ferrite core 1 so as to face the outer peripheral surfaces of the flanges 1b at both ends of the drum type ferrite core 1 with a gap therebetween. ing.

  Here, the gap between the partially closed magnetic path forming member 3 and the flange 1b is set to a dimension that provides a magnetic flux density like a closed magnetic path between the drum type ferrite core 1 and the partially closed magnetic path forming member 3. Yes. Further, in the present embodiment, the two partially closed magnetic path forming members 3 are arranged at a position sandwiching a central angle of 90 ° with respect to the axis center of the drum type ferrite core 1.

  Next, a second embodiment in which the winding component according to the present invention is applied to an inductor will be described with reference to FIGS. In addition, about the same component as what was shown in FIG. 1, the same code | symbol is attached | subjected and the description is simplified.

The inductor according to the present embodiment includes a plate-like frame member 4 which is formed in a substantially square shape in plan view and has a thickness dimension substantially equal to the length dimension in the axial direction of the drum-type ferrite core 1.
The frame member 4 is formed of an insulating thermoplastic resin such as liquid crystal polymer (LCP), and has a through hole having an inner diameter slightly larger than the diameter of the flange portion 1b at the center thereof. 5 is formed.

  The drum type ferrite core 1 is inserted into the through hole 5. A pair of flat terminal boards 6 made of a metal plate are fixed to the mounting surface 4a placed on the printed wiring board or the like of the frame member 4. Here, the terminal board 6 is arranged along the outer periphery which the frame member 4 opposes so that a part of through-hole 5 may be plugged and the drum-type ferrite core 1 may be prevented from falling off.

Further, terminal portions 6a are formed at the front end portions of the terminal plates 6 in the same direction so as to protrude outward from the adjacent corner portions C ₁ and C _{2 of the} frame member 4, respectively. Each end of the coil 2 is entangled and connected to the part 6.

Then, the terminal portions 6a of the frame member 4 is not disposed two corners C _3, C _4, each circular cross hole 7 is formed, cylindrical said portion closed magnetic Each hole 7 A path forming member 3 is inserted. As in the first embodiment, the hole 7 is formed so that the partially closed magnetic path forming member 3 does not contact the flange 1b, and the drum-type ferrite core 1 and the partially closed magnetism are between the flange 1b. Between the path forming members 3, the gap is formed at a position where a gap having a dimension capable of obtaining a magnetic flux density like a closed magnetic path is formed.

  Furthermore, in this embodiment, as shown in FIG. 4, the inner diameter of the hole 7 is formed in a tapered shape that is gradually reduced in diameter from the mounting surface 4a side toward the upper surface 4b side on the opposite side. Correspondingly, the partially closed magnetic path forming member 3 is also formed in a gentle conical shape whose outer diameter is gradually reduced from the mounting surface 4 a side to the upper surface 4 b side of the frame member 4. The partially closed magnetic path forming member 3 is fixed in each hole 7 by being inserted after the adhesive is applied.

  On the other hand, the opening on the mounting surface 4 a side of the hole 7 in which the partially closed magnetic path forming member 3 is inserted is sealed by the terminal plate 6. Accordingly, a mechanism for preventing the partial closed magnetic path forming member 3 from coming off to the upper surface 4b side and the mounting surface 4a side of the hole 7 is configured.

  In the first and second embodiments, only the case where two columnar partially closed magnetic path forming members 3 are arranged has been described. However, the present invention is not limited to this.

For example, as in the third embodiment shown in FIG. 5, a partially closed magnetic path forming member 10 having a circular plate shape or a flat plate shape that partially extends along the outer periphery of the flange portion 1 b of the drum type ferrite core 1 is used. The partially closed magnetic path forming member 10 may be inserted into and fixed to each of the circular cylindrical or rectangular cylindrical holes 11 formed in the corner portions C ₃ and C ₄ .

Alternatively, as in the fourth embodiment shown in FIG. 6, a triangular prism-shaped partially closed magnetic path forming member 12 is produced, and a triangular cylindrical hole formed in the corners C ₃ and C ₄ of the frame member 4. The central rail part closed magnetic path forming member 11 can be inserted into and fixed to the respective 13.

Further, in the fifth embodiment shown in FIG. 7, one arc plate-like partially closed magnetic path forming member 14 that partially extends along the outer periphery of the flange 1 b across the corners C ₃ and C ₄ is used. It has been. In this case, the frame member 4 is formed with an arcuate cylindrical hole 15 extending between the corners C ₃ and C ₄ and having a central portion opened on the side surface of the frame member 4. The partially closed magnetic path forming member 14 is inserted and fixed in the hole 15.

  According to the inductors shown in the first to fifth embodiments having the above-described configuration, plate-like or columnar partially closed magnetic path forming members 3, 10, 12, 14 are arranged around the drum-type ferrite core 1. In order to form a closed magnetic circuit through a gap and a part of the outer periphery of the flange 1b formed at both ends of the type ferrite core 1, the partially closed magnetic circuit forming members 3, 10, 12, 14 Leakage of magnetic flux, which has been a problem with conventional winding components of an open magnetic circuit, can be suppressed.

  In addition, since the partially closed magnetic path forming members 3, 10, 12, and 14 are disposed along the axial direction at positions separated from the flange 1 b of the drum type ferrite core 1, the trunk portion of the drum type ferrite core 1 is provided. There is no possibility of interfering with the coil 2 wound around the outer periphery of the la, and therefore, a material having a low surface electric resistance value can be used as the partially closed magnetic circuit forming members 3, 10, 12, and 14.

  As a result, as the partially closed magnetic path forming members 3, 10, 12, and 14, it is possible to use a ferrite having a higher magnetic permeability than the drum type ferrite core 1 and a material having a high saturation magnetic flux density such as iron and permalloy. Even with a partially closed magnetic circuit, the inductance value and the rated current value can be effectively increased.

  As a result, the target inductance value and rated current value can be easily obtained, and the design margin can be improved. Conversely, when the inductance value and rated current value are the same as the conventional one, the coil wire diameter can be made thicker and the number of windings can be reduced than the conventional product. It is also possible to pass a larger current with a margin.

In particular, the drum-type ferrite core 1 is provided in the through hole 5 of the rectangular plate-like frame member 4 having insulation, and two adjacent corners C ₁ and C ₁ on the mounting surface 4a side of the frame member 4 are disposed. ₂ , hole portions 7, 11, 13, and 15 formed between the corner portions C ₃ and C ₄ or the corner portions C ₃ and C ₄ where the terminal portions 6a are not disposed. In addition, since the partially closed magnetic path forming members 3, 10, 12, and 14 are inserted, even if the drum-type ferrite core 1 has a small diameter and the frame member 4 has a small rectangular plate shape, the terminals are effectively provided. The plate 6 and the partially closed magnetic path forming members 3, 10, 12, 14 can be accommodated in the frame member 4.

  Further, since the partially closed magnetic path forming members 3, 10, 12, 14 are inserted and positioned in the holes 7, 11, 13, 15 formed in the frame member 4, the desired insulation distance can be increased with high accuracy. And stable electrical characteristics can be obtained.

In addition, it is possible to reliably prevent the partially closed magnetic path forming members 7, 11, 13, and 15 from coming into contact with the coil 2 wound around the drum type ferrite core 1. Furthermore, since the terminal portion 6a is disposed at the corners C ₁ and C ₂ of the frame member 4, the coil member 2 is protected by the frame member 4 when spot welding is performed by tying the end portions of the coil 2. You can also.

  Further, the hole 7 (11, 13, 15) and the partially closed magnetic path forming member 3 (10, 12, 14) are tapered so that the diameter is gradually reduced from the mounting surface 4a side toward the opposite upper surface 4b side. While being formed, the opening on the mounting surface 4 a side of the hole 7 (11, 13, 15) into which the partially closed magnetic path forming member 3 (10, 12, 14) is inserted is sealed by the terminal plate 6.

  For this reason, it is possible to reliably prevent the partially closed magnetic path forming member 3 (10, 12, 14) from dropping out of the hole 7 (11, 13, 15) even before mounting such as during manufacturing or transportation. The structural reliability as a part can be improved.

  8 (a) is provided with a conventional disclosed path type inductor not provided with the partially closed magnetic circuit forming member and the partially closed magnetic circuit forming member 3 according to the present invention shown in FIGS. 8 (b) and 8 (c). For the inductor, the current-inductance relationship was verified by CAE analysis.

  Incidentally, FIG. 8B assumes that the terminal portion is arranged at the corner corner in the diagonal direction of the frame member, and the partially closed magnetic path forming member 3 is moved with respect to the axial center of the drum type ferrite core 1. This is a case where the central angle is 180 °. Further, FIG. 8C assumes a case where the terminal portion is arranged at an adjacent corner portion of the frame member, and the central angle of the partially closed magnetic path forming member 3 with respect to the axial center of the drum-type ferrite core 1. This is a case where 90 ° positions are arranged.

FIG. 9 shows the analysis result.
From FIG. 9, it can be seen that the inductor according to the present invention provided with the partially closed magnetic path forming member 3 has a higher inductance value than that of the conventional disclosed path type. As a result, it has been proved that a margin is generated in the inductance value with respect to the rating, and a high rated current value can be secured by reducing the number of windings of the coil.

  Next, as shown in FIG. 10, two flat (prism-like) portions partially along the outer periphery of the flange portion 1 b of the drum type ferrite core 1 similar to that shown in the third embodiment of FIG. 5. The same analysis was performed on the inductor in which the closed magnetic path forming member 10 is arranged.

FIG. 11 compares the result with that of a conventional disclosed road type.
As can be seen from FIG. 11, according to this inductor, it is possible to obtain an inductance value much higher than that shown in FIG.

  Therefore, in the above-described embodiments, particularly as in the inductors shown in the third and fifth embodiments, the opposed areas (partially closed magnetic path forming members 10 and 12 and the outer periphery of the body 1b of the drum type ferrite core 1) ( It has been found that the larger the (length), the greater the effect of forming the partially closed magnetic circuit, and higher characteristics can be obtained.

  A coil is wound around a drum core and used as a winding component used as a power inductor, a choke coil or the like.

1 Drum type ferrite core (drum type core)
2 Coil 3, 10, 12, 14 Partially closed magnetic path forming member 4, 11, 13, 15 Frame member 4a Mounting surface 5 Through hole 6a Terminal portion 7 Hole portion

Claims (4)

A plate-like or column-shaped partially closed magnetic path forming member made of a material having a higher magnetic permeability than the drum core is formed at both ends of the drum core around the drum core around which a coil is wound around the outer periphery of the drum section. so as to form a closed magnetic path through a portion and the gap of the outer periphery of the flange that is, Ri Na are arranged along the axial direction of the drum core at a position spaced from said flange portion,
In addition, a through-hole is formed in the central part of the rectangular plate-shaped frame member having an insulating property, the drum core is provided in the through-hole, and at the two corners on the mounting surface side of the frame member, A terminal portion to which an end portion of each of the coils is connected is disposed, and a hole portion is formed between the corner portions of the frame member where the terminal portion is not disposed or between the corner corner portions. coil component, wherein Rukoto the partial closed magnetic path forming member is inserted.   2. The winding according to claim 1, wherein the partially closed magnetic path forming member is formed in a columnar shape, a polygonal column shape, a flat plate shape, or a circular arc plate shape partially along an outer periphery of the flange portion. parts. The hole formed in the frame member has a function of preventing the partial closed magnetic path forming member from coming off to the upper surface side by forming the inner dimension of the upper surface side smaller than the mounting surface side of the frame member. winding component according to claim 1 or 2, characterized in that it comprises. The winding part according to any one of claims 1 to 3, wherein the opening on the mounting surface side of the hole into which the partially closed magnetic path forming member is inserted is sealed by the terminal part. .

Images