JP2010098079A - Inductance element - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inductance element which has an insulating film in a coil front end part easily managed with respect to peeling workability and finished dimensions, has improved mountability by enhancing drawing position precision and can maintain breakdown voltage performance. <P>SOLUTION: In an inductance element 1a, a conductor 5 is wound around semicircular winding parts 8 bisected by an insulating partition 6 of a core assembly, in the right and the left with the insulating partition 6 as an axis of symmetry to form a pair of coils. Each coil has a structure where the conductor 5 has a winding start 5a wound in one turn in a gap of partitions 4a and, in second and following turns, is wound in one layer approximately uniformly from one end to the other of the semicircular winding part 8 except the gap of partitions 4a and a gap of partitions 4b or is wound in many layers by forward winding and backward winding when necessary and the last turn, namely, a winding end 5b is drawn out through the gap of partitions 4b. The front end part of each coil is plated with solder and taken as a mounting terminal 7 to a power source substrate or the like. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an inductance element used as a noise filter for preventing electrical noise (hereinafter referred to as noise) generated from various electronic devices and propagating through a power supply line or the like.

  Electronic devices such as personal computers and thin liquid crystal TVs are designed to suppress noise that is generated and transmitted and propagated from their own devices, and that they are not affected by noise generated by other devices. It is defined by various safety standards such as the Product Safety Law, VCCI, Radio Law, CISPR. For this reason, in order to comply with various safety standards, a noise filter using an inductance element or the like is provided in a power input / output unit of an electronic device having a noise problem.

  Generally, the noise is a mixture of balanced mode noise (hereinafter referred to as common mode noise) and unbalanced mode noise (hereinafter referred to as normal mode noise). Common mode noise is generated when there is a potential difference between the input and output lines as seen from the ground. Is a potential difference between the power supply side and the ground side.

  5 and 6 are diagrams for explaining a conventional inductance element. FIG. 5A is a front view of the core assembly, FIG. 5B is a side view of the core assembly, and FIG. FIG. 6B is a side view of the inductance element, and FIG.

  5 (a) and 5 (b), the conventional core built-in body has an insulating partition 6 on the inner periphery, and a UU-type insulating case 3c fitted to each other, and a toroidal magnetic core 2 And a pair of semi-annular winding portions 8 divided into two by the insulating partition 6 on each of the left and right sides with the insulating partition 6 as the axis of symmetry.

  The conventional inductance element 1c shown in FIGS. 6 (a) and 6 (b) includes a pair of coils on each of the left and right semi-annular winding portions 8 with the insulating partition portion 6 of the above-described core built-in body as the axis of symmetry. Is forming. Each coil is wound in a single layer from end to end of the semi-annular winding portion 8 or in multiple layers while reciprocating as necessary, and both ends of the winding start 5a and winding end 5b are set in a desired manner. The mounting terminal 7 is drawn from the position. Such an inductance element is disclosed in Patent Document 1, for example.

JP-A-2-060117

  However, in the conventional inductance element 1c, when the leading ends of the coil winding start 5a and winding end 5b are pulled out, the height and width of the coil are likely to vary depending on the winding state due to the overlap with the adjacent windings. It was difficult to manage the dimensions of the coil tip.

  Further, in the conventional inductance element 1c, since both ends of the coil are solder-plated to form mounting terminals, there is a possibility that the adjacent winding is in contact with the molten solder-plated portion. The withstand voltage performance is determined only by the insulation strength. In order to avoid such a decrease in the withstand voltage performance due to the contact between the solder plating portion and the winding portion of the mounting terminal, it is necessary to strictly manage the soldering dimension, which requires a management man-hour.

  Further, since the conventional insulating case 3c shown in FIGS. 5 (a) and 5 (b) has a flat surface, when the both ends of the coil serving as the mounting terminal are pulled out, the winding portion and the leading portion overlap. As the coil height and coil thickness variation increases, the drawer part moves, so temporary fixing with an adhesive is required to fix the position. In order to prevent the withstand voltage performance between the solder-plated portion and the winding from being lowered and the solder-plated portion and the winding portion are not in contact with each other, the peeling dimension of the insulating film of the conductor 5 is prevented. There was a problem that had to be strictly managed.

  Accordingly, the present invention solves the above technical problems, facilitates the workability of stripping the insulating coating on the coil tip of the inductance element, and makes it possible to manage the finished dimensions, as well as improving the pulling position accuracy and improving the mountability. An inductance element capable of maintaining a withstand voltage performance is provided.

  The present invention provides two juxtaposed projections for separating the leading end of the winding tip so that the winding portion and the leading end of the winding tip serving as the mounting terminal do not overlap or contact each other. A partition portion or a groove is formed on the surface of the insulating case.

  According to the present invention, there is provided an inductance element in which an annular magnetic core is housed in an annular insulating case, and one or more coils are formed by winding a conductor in the circumferential direction of the insulating case. At least one partition part having a gap through which the conductor passes is formed on the surface in a radial pattern from the central axis of the insulating case, and the tip of the coil is drawn out along the gap of the partition part. An inductance element characterized by the above can be obtained.

  According to the present invention, it is easy to manage the coil height, the coil thickness dimension, and the positioning dimension of the tip part which is a mounting terminal by avoiding the overlap between the coil tip part and the adjacent or adjacent winding part. Become.

  According to the present invention, the withstand voltage performance between the solder plating portion of the tip portion and the adjacent winding can be ensured by avoiding contact between the lead portion of the coil tip portion and the adjacent or adjacent winding portion. At the same time, it is possible to simplify the process of managing the peeling dimension of the conductor insulation film, which has been conventionally performed to ensure the withstand voltage performance between the solder plating portion and the adjacent winding.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1 and 2 are diagrams illustrating an inductance element according to the present invention. FIG. 1A is a front view of a core assembly, FIG. 1B is a side view of the core assembly, and FIG. FIG. 2B is a side view of the inductance element, and FIG. FIG. 2 shows a horizontally placed inductance element 1a.

The core assembly shown in FIGS. 1 (a) and 1 (b) is a UU-type toroidal insulating case 3a that fits into each other, and the toroidal magnetic core 2 is housed in the insulating case 3a. In order to ensure the insulation between the two coils wound around the outer periphery, the insulating partition 6 is provided so as to divide the circumference into two equal parts.
In addition, on the surface of the insulating case 3a, partition portions 4a and 4b each having two protruding portions arranged side by side are formed on both sides of the winding portion 8, that is, at two extraction positions on the coil tip. Furthermore, the insulating partition part 6 is formed at a total of four locations on the left and right sides with the axis of symmetry as the axis of symmetry. Further, the two sets of partition portions 4a and 4b are formed on the upper surface, inner peripheral surface, and outer peripheral surface of the insulating case 3a in FIG. In addition, the partition parts 4a and 4b are displayed with diagonal lines.

  The inductance element 1a shown in FIGS. 2 (a) and 2 (b) is provided with the insulating partition portion 6 on the semi-annular winding portion 8 divided into two equal parts by the insulating partition portion 6 of the core built-in body described above. A pair of coils is formed by winding a conductor 5 on each of the left and right sides of the axis of symmetry. Each coil has its winding start 5a wound around the gap of the partition part 4a for one turn, and after two turns from end to end of the semi-annular winding part 8 excluding the gap of the partition part 4a and the gap of the partition part 4b. One layer is wound substantially evenly or in multiple layers while reciprocating as necessary, and the last one turn, that is, the winding end 5b is pulled out through the gap of the partition portion 4b. Thereafter, the tip of each coil is subjected to solder plating to form a mounting terminal 7 on a power supply board or the like. In addition, the solder plating process part is displayed with the oblique line.

  3 and 4 are diagrams illustrating the inductance element of the present invention. FIG. 3A is a front view of the core assembly, FIG. 3B is a side view of the core assembly, and FIG. FIG. 4B is a front view of the inductance element, and FIG. 4B is a side view of the inductance element. FIG. 4 shows a vertically installed inductance element 1b.

  The core built-in body shown in FIGS. 3 (a) and 3 (b) is obtained by housing the toroidal magnetic core 2 in a UU-type toroidal insulating case 3a that fits each other. In order to ensure the insulation between the two coils wound around the outer periphery, the insulating partition 6 is provided so as to divide the circumference into two equal parts. Further, on the surface of the insulating case 3b, a partition portion 4a having a set of two protruding portions arranged side by side is formed at one side of the winding portion 8, that is, at the drawing position of the coil tip portion on the mounting side, and further insulated. The partition 6 is formed in two places in total on the left and right with the axis of symmetry as the axis of symmetry. Further, both of the partition portions 4a are formed on the entire upper surface, lower surface, inner peripheral surface, and outer peripheral surface of the insulating case 3b in FIG. In addition, the partition part 4a is displayed with the oblique line.

  4 (a) and 4 (b), the inductance element 1b draws the coil winding start 5a from the gap of one partition 4a and pulls the coil winding end 5b from the gap of the other partition 4b. Structure. Each coil has one turn wound around the gap between the two partition portions 4a in which the winding start 5a is arranged in parallel, and after the second turn, the semi-annular winding portion 8 excluding the gap between the partition portion 4a and the gap between the partition portions 4b. One layer is wound substantially evenly from end to end, or is wound in multiple layers while reciprocating as necessary, and the last one turn, that is, the winding end 5b is pulled out through the gap of the other partition portion 4b. Thereafter, the tip of each coil is subjected to solder plating to form a mounting terminal 7 on a power supply board or the like. In addition, the solder plating process part is displayed with the oblique line.

  In this way, by pulling out both ends of the coil via the gaps between the partition portions 4a and 4b, the tip and the adjacent winding other than the tip can be reliably separated. In addition to avoiding the deterioration of the insulating properties of the insulating coating due to the contact due to the heat effect during the plating process, the positioning accuracy of each leading end is facilitated, and the mountability to the power supply board or the like can be improved.

  The inductance element 1a shown in FIG. 2 and the inductance element 1b shown in FIG. 4 both have an insulating partition portion 6 that divides the circumference into two parts to ensure insulation between the coils, and can be fitted to each other. The toroidal magnetic core 2 is housed in the UU type insulating cases 3a and 3b, the conductor 5 is wound around the semi-annular winding portion 8 divided into two equal parts by the insulating partition portion 6, and the insulating partition portion 6 is symmetrical. Inductance elements for common mode noise countermeasures with two coils formed on the left and right sides as axes, but for normal mode noise countermeasures, where the insulating partition 6 is eliminated and one coil is formed over the entire circumference. For example, a three-phase AC power supply common mode noise pair is formed by forming a smoothing inductance element or an insulating partition 6 that divides the circumference into three parts and forming three coils in each partitioned part. It can also be applied to the inductance element of use. Furthermore, a plurality of coils can be electrically connected in series or in parallel, and can be appropriately configured according to application and characteristic requirements.

  The magnetic core 2 may be a magnetic material having a desired magnetic permeability μ, such as Mn—Zn-based or Ni—Zn-based ferrite sintered body, amorphous, iron silicon alloy, permalloy, sendust, or other metal magnetic material, sendust. A green compact such as a magnetic powder or a magnetic material formed into a film may be used, and it is preferable to select appropriately according to required characteristics. Moreover, the outer shape should just be cyclic | annular and may be any shape, such as circular, an oval, an ellipse, and a polygon. Further, the cross section may be circular, oval, rectangular, polygonal, or any other shape.

  The insulation cases 3a and 3b may be either a UI type or a UU type as long as they house the magnetic core 2 and are fitted to each other. Moreover, it is good also as a structure which forms the insulation partition part 6 which divides a circumference into multiple equal parts, and winds a coil around each partitioned part. In addition, the material may be any insulating material having a thickness and a width that can conform to the regulations relating to insulation defined by various safety standards, such as polypropylene (PP), polystyrene (PS), polybutylene terephthalate (PBT), It may be a thermoplastic resin such as nylon or liquid crystal polymer, or a thermosetting resin such as epoxy or phenol. Further, the outer shape may be an annular shape, and may be any shape such as a circle, an oval, an ellipse, and a polygon.

  The partition portions 4a and 4b are preferably made of the same material as the insulating cases 3a and 3b and are integrally molded in terms of molding, but may be made of different materials or retrofitted as necessary. Moreover, it is preferable to form two convex parts substantially parallel so that a coil front-end | tip part may be pinched | interposed in the drawer part of a coil front-end | tip part, ie, the positioning location of a mounting terminal, as the location to form.

  The form to be formed may be any form as long as the lead part of the coil tip part is formed so as not to come into contact with the adjacent winding part, as shown in FIGS. 1 (a) and 1 (b), Of the surface of the insulating case 3a, even if the upper surface portion, the inner peripheral portion, and the outer peripheral portion are formed in a substantially radial shape from the center of the inner diameter, as shown in FIG. 3 (a) and FIG. It may be formed on the entire surface. Furthermore, two convex portions connected in a column over the entire surface may be connected to form two walls, or one or more notches may be provided in any of the convex portions aligned in a column over the entire surface. However, so that the coil tip can be smoothly routed across the wall without increasing the external dimensions in the gap between the partitions, FIG. 1 (a), FIG. 1 (b), FIG. 3 (a), FIG. As shown in b), the conductor 5 is preferably formed to have a notch with a width larger than the wire diameter. By forming in this way, the coil tip can be smoothly routed into the gap across the notch.

  Further, in FIG. 1, since the two coils are wound in FIG. 1, the number is four corresponding to the leading portions of the both ends, but as shown in FIG. It is good also as two places to do, and adjusting suitably is preferable.

  The outer dimensions of the partition portions 4a and 4b have an appropriate thickness that does not damage the width, and the height and gap are preferably such that the conductor diameter of the coil can be accommodated and the lead portion does not move greatly. It is preferable to be within 2 times. Moreover, although the partition part is formed with two convex parts, it may be a concave part or a groove part. Further, an appropriate C surface or R surface is formed on the inner and outer surfaces of the gap where the conductor contacts to insulate the conductor 5. It is preferable to mold so as to avoid local stress on the coating and prevent deterioration of the insulating properties.

  The conductor 5 may be any of enameled wires such as polyurethane wires (UEW), polyester wires (PEW), and polyamideimide wires (AIW), and vinyl electric wires such as polyvinyl chloride wires, polyethylene vinyl wires, and fluororesin-coated wires. It is preferable to select appropriately according to required characteristics.

  The insulating partition 6 may be made of the same material as the insulating cases 3a and 3b or a different material. The forming method may be integrally formed with the insulating case 3a or retrofitted, and is preferably selected as appropriate in consideration of winding workability.

  Hereinafter, it explains in full detail using an Example.

  As the magnetic core 2, a Mn—Zn ferrite core having a magnetic permeability of 10,000 with an outer diameter of 22 mm, an inner diameter of 14 mm, and a height of 10 mm was used. As the insulating case 3a, polypropylene (PP) resin was used and formed with a toroidal shape having an outer diameter of φ24 mm, an inner diameter of φ12 mm, a height of 12 mm, and a wall thickness of 0.5 mm, and having an insulating partition portion 6 that divides the circumference into two. . As the partition portions 4a and 4b, the leading ends of the four coil portions of the insulating case 3a are pulled out so that the two convex portions arranged side by side have a width of 0.6 mm, a height of 0.8 mm, and a gap of 0.8 mm. At the position, notches were formed in the upper surface, inner periphery, and outer periphery of the radial surface from the central axis to form columns. The insulating case 3a, the partition portions 4a and 4b, and the insulating partition portion 6 were integrally formed. The conductor 5 uses a polyurethane-coated copper wire having a wire diameter of φ0.6 mm, winds a coil of 40 turns around the winding portion 8 excluding the gap between the partition portions 4a and 4b, and attaches the coil winding start 5a. Pull out from the gap of the partition part 4a, pull out the coil end 5b from the gap of the partition part 4b, and immerse each tip in a molten solder bath at a predetermined immersion depth to thermally peel the insulation coating of the immersion part. Then, the solder plating process was performed to form the mounting terminal 7, and the horizontally placed inductance element 1 a of the present invention shown in FIG. 2 was obtained.

  The horizontal installation type inductance element 1a according to the embodiment of the present invention shown in FIG. 2 and the conventional horizontal installation type inductance element 1c shown in FIG. In Table 1, the inductance L, the DC resistance Rdc, the coil height dimension and its variation σ were measured, and the comparison results of the average values at n = 30 are shown.

  Further, in the inductance elements of the above-described examples and comparative examples, Table 2 shows a comparison result of average values at n = 30 with respect to the time of solder plating treatment at the coil tip and the confirmation time of the peeling position.

  As shown in Table 1, in the embodiment of the present invention, the inductance L and the DC resistance Rdc, which are electrical characteristics, are equivalent to those of the conventional comparative example, but the terminal lead portion does not overlap with the winding portion. It was found that the coil height dimension of the terminal lead-out portion was reduced and the variation was small.

  As shown in Table 2, in the embodiment of the present invention, since the management of the processing length during the solder plating process can be simplified as compared with the conventional comparative example, the average time of the solder plating process can be shortened by 3 seconds and the peeling is performed. Since the position confirmation work is unnecessary, it was found that the entire work can be shortened by 11 seconds.

  The embodiments of the present invention have been described above using the embodiments. However, the present invention is not limited to these embodiments, and the present invention is not limited to the scope of the present invention. Included in the invention. That is, the present invention also includes various variations and modifications that could be made by those skilled in the art.

  The inductance element of the present invention can contribute to the construction of EMC and EMI markets capable of reducing the performance and size of noise filters mounted on various electronic devices.

The figure explaining the inductance element of this invention, Fig.1 (a) is a front view of a core incorporating body, FIG.1 (b) is a side view of a core incorporating body. The figure explaining the inductance element of this invention, Fig.2 (a) is a front view of an inductance element, FIG.2 (b) is a side view of an inductance element. The figure explaining the inductance element of this invention, Fig.3 (a) is a front view of a core incorporating body, FIG.3 (b) is a side view of a core incorporating body. FIG. 4A is a front view of the inductance element, and FIG. 4B is a side view of the inductance element. FIG. 5A is a front view of a core built-in body, and FIG. 5B is a side view of the core built-in body. FIG. 6A is a front view of the inductance element, and FIG. 6B is a side view of the inductance element.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1a, 1b, 1c Inductance element 2 Magnetic core 3a, 3b, 3c Insulating case 4a, 4b Partition part 5 Conductor 5a Winding start 5b Winding end 6 Insulating partition part 7 Mounting terminal 8 Winding part

Claims (1)

  An inductance element in which an annular magnetic core is housed in an annular insulation case and one or more coils are formed by winding a conductor in the circumferential direction of the insulation case, At least one partition part having a gap through which the conductor passes is formed in a radial pattern from the central axis of the case, and the tip of the coil is drawn out along the gap of the partition part. Inductance element.

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