JP2009224687A - Inductance element - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inductance element capable of attaining reduction in cost by reducing conductors or dielectrics to be used. <P>SOLUTION: In the inductance element, a conductor 13 and a dielectric 14 are disposed in the vicinity of a coil, to generate a ground capacitance between the coil and the conductor 13. Thus, an inter-wire capacitance generated between covered lead wires 15, 16 which form the coil is canceled, thereby superior attenuation characteristics are obtained. The covered lead wires 15, 16 to be wound around a magnetic core 11 are separately wound herein, thereby decreasing the inter-wire capacitance in the coil of the inductance element. Thus, even for a small ground capacitance, the inter-wire capacitance can be canceled, and conductors 13 and dielectrics 14 to be used are reduced, thereby the cost of the inductance element is reduced. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an inductance element used for a noise filter or the like mainly in an AC line (AC line).

  When an inductor for noise suppression (a coil having a magnetic core) is used in a high frequency region, the magnetic core is grounded in order to eliminate the adverse effect of the line capacitance of the coil constituting the inductor on the noise suppression function. At the same time, there has been proposed an inductor technique in which a coil is formed by directly winding a coated conductor around a grounded magnetic core. Patent Document 1 and Patent Document 2 are examples of such an inductor, in which an inductor is configured as a choke coil that attenuates normal mode noise.

  On the other hand, considering the withstand voltage of the coated conductor, etc., a dielectric and an adjacent conductor are formed in order on the surface of the magnetic core on which the ground conductor is formed, and the coated conductor is wound on the surface to form a coil. There has also been proposed a structure in which the magnetic core and the coated conductor are separated from each other, thereby increasing the withstand voltage of the coated conductor (see Patent Document 3).

  As an element used as a noise filter for an AC line, an inductance element having a toroidal-shaped magnetic core and having a configuration in which two coated conductors are wound around a half region of the magnetic core to form a coil is generally used. Has been used. The two coated conductors are wound so that the magnetic fluxes in the magnetic core strengthen each other with respect to the in-phase signal. By arranging such an inductance element on the AC line, the noise of the different phase superimposed on the current (normal mode noise) is converted into opposite magnetic fluxes excited in the magnetic core by two coils. They will cancel each other out. On the other hand, in-phase noise (common mode noise) superimposed on the current flowing in the AC line is attenuated by the impedances of the two coils wound around the inductance element.

  This impedance becomes maximum in the region of the resonance frequency due to the capacitor component due to the line capacitance of each coil and the inductor component, and gradually decreases in the region of higher frequency due to the presence of the capacitor component. That is, when such an inductance element is used as a noise filter, there is a problem that the attenuation amount of common mode noise is small in a high frequency region. In order to solve this problem, it is necessary to insert another choke coil or the like, which causes an increase in the size and cost of a noise filter including an inductance element.

  There has been proposed an inductance element that solves this problem and can attenuate common mode noise to a high frequency by using one inductance element having a toroidal magnetic core. 12 and 13 describe the inductance element of such a reference example. Here, FIG. 12 shows a front view of an example of an inductance element, and FIG. 13 shows a front view of an example of an inductance element different from the example of FIG. The examples of the inductance elements shown in FIGS. 12 and 13 are all related to the invention of the applicant of the present application, and are not publicly known techniques.

  The members used in the example of the inductance element shown in FIG. 12 include a core case 22 made of an insulator that houses a magnetic core and covers the whole, and is wound around the core case 22 to form a coil. Coated conductors 25 and 26, a conductor 23 disposed on the outer peripheral surface of the core case 22 and connected to a ground terminal 27, a dielectric disposed between the coated conductors 25 and 26 and the conductor 23, and insulating the two 24. In the example of FIG. 12, the coated conductive wire 26 is wound around the core case 22 by one reciprocal half in accordance with the winding order 28. Further, the coated conductor 25 is also wound around the core case 22 in the same manner as the coated conductor 26. The conductor 23 is formed by a method such as attaching a foil-like conductor on the outer peripheral surface of the core case 22. On the other hand, the configuration of the example of the inductance element shown in FIG. 13 is the same as that of the example of FIG. 12, and the difference in configuration between the two is that in the case of the example of FIG. The conductor 23 is provided not on the outer peripheral surface but on the outer peripheral surface of the coil composed of the coated conductive wires 25 and 26 and further connected to the ground terminal 27 on the outer peripheral surface.

  In the case of the example shown in FIG. 12, when manufacturing the inductance element, first, the conductor 23 and the dielectric 24 are arranged on the outer peripheral surface of the core case 22 in which the magnetic core is accommodated, and then, the covered conductors 25 and 26 are wound so as to be wound. The coil is formed around the core case 22. On the other hand, in the case of the example shown in FIG. 13, first, the coated conductors 25 and 26 are wound around the core case 22 to form a coil, and then the dielectric 24 and the conductor 23 are disposed on the outer peripheral surface of the coil. Become. In either case, the ground terminal 27 is finally connected to the conductor 23.

  Here, in any of the examples shown in FIGS. 12 and 13, the conductor 23 and the dielectric 24 are used to improve the attenuation amount (high frequency characteristics) of the common mode noise in the inductance element in the high frequency region. It is provided. The conductor 23 is for generating a capacitor function that temporarily accumulates electric charge between the covered conductor 25 and the covered conductor 26, that is, a grounding capacity. With this grounding capacity, the line capacity generated between the covered conductors 25 and between the covered conductors 26 can be canceled. Thereby, the capacitor component due to the line capacitance of each coil can be reduced to shift the resonance frequency region to the high frequency region, and the impedance of the high frequency region with respect to the common mode noise of the inductance element can be increased.

JP 9-102426 A JP 2004-31866 A JP 2004-235709 A

  In the example of the inductance element shown in FIG. 12 and FIG. 13, in order to improve the high-frequency characteristic against common mode noise, the value of the line capacitance in the coil formed by the coated conductor, and the conductor and the coated conductor are used. It is necessary to set the ratio of the ground capacitance values to be set to appropriate values. In general, in the inductance element having the shape shown in FIGS. 12 and 13, in order to obtain sufficient high-frequency characteristics by canceling the line capacitance between the coils by the ground capacitance formed between the coil and the conductor by the coated conductor, A grounding capacitance several times larger than the line capacitance of the inductance element is required. For this reason, the amount of conductors and dielectrics used to create the required ground capacitance increases, which increases the manufacturing cost of the inductance element. In particular, a silicone sheet is preferably used as the dielectric disposed between the coil and the conductor. However, the silicone sheet is relatively expensive, and the increase in the amount of use is intended to reduce the manufacturing cost of the inductance element. It becomes an obstacle.

  The present invention solves the problem of reducing the manufacturing cost without deteriorating the high-frequency characteristics of the inductance element with respect to common mode noise.

  The problem-solving means in the present invention is to reduce the ground capacitance necessary for obtaining sufficient high-frequency characteristics against common mode noise by reducing the line capacitance between the coils of the inductance element. In order to reduce the line capacity between the coils, in the present invention, the method of winding the coated conductor wound around the magnetic core to form the coil is changed from the case shown in FIGS. 12 and 13. Then, division winding is performed.

  Here, the divided winding means that the winding region of the magnetic core around which the coated conductor is wound is divided into a plurality of areas, and the coated conductor is overlapped on each area and then another area (in many cases, adjacent areas). ) And then winding. Once you have wound and moved to another zone, you will not return to the original zone and roll again. Therefore, one winding area and the next winding area are connected to each other by only one coated conductor. Further, in the case of winding, the wrapping is repeated many times while reciprocating the covered conductor in one area, so that the windings are stacked. Between adjacent areas, a gap area where no winding is performed may be provided, or the windings may be wound in contact with each other without providing a gap. Absent.

  In general, it has been conventionally known that when split winding is performed when a coil is formed by winding a coated conductor on a magnetic core, the inter-line capacitance in the coil is reduced. However, with this method, the line capacitance is reduced and not canceled out. Therefore, when an inductance element that is only split winding is used as a noise filter such as an AC line, the resonance between the line capacitance is reduced. Since the frequency shifted to the high frequency side, the high frequency characteristics were only slightly improved.

  In the present invention, a noise filter such as an AC line is constituted by only one inductance element by applying this split winding technique to the technique of an inductance element having a dielectric and a conductor as shown in FIGS. In addition to this, it is possible to reduce the manufacturing cost of the inductance element by reducing the amount of dielectric and conductor used. Since the cost of the inductance element mainly depends on the amount of dielectric used rather than the conductor, if only the amount of dielectric used can be reduced without changing the area of the conductor used, the manufacturing cost will be reduced. It is effective for reduction. However, since the dielectric is used to insulate between the conductor and the coated conductor, its area cannot be made smaller than that of the conductor. Therefore, in order to reduce the cost of the inductance element, it is necessary to reduce the ground capacitance to be possessed and thereby reduce the amount of both the conductor and the dielectric used.

  That is, the present invention relates to a magnetic core, a coil formed by winding a coated conductor around the magnetic core, a dielectric provided in contact with or close to at least a part of the coil, and the magnetic core. The coil is an inductance element including a capacitor and a conductor having a ground terminal, and the coated conductor is divided into a plurality of sections obtained by dividing the magnetic core. An inductance element that is wound.

  The present invention also provides the inductance element, wherein the magnetic core is a toroidal core.

  Furthermore, the present invention is characterized in that the coated conductor wire, which is separately wound in each of the plurality of sections of the magnetic core, is wound with a gap provided between adjacent sections. It is an inductance element.

  Further, according to the present invention, the coated conductor wire, which is separately wound in each of the plurality of sections of the magnetic core, is wound in both sections without providing a gap between adjacent sections. Further, the inductance element is characterized in that the coated conducting wires are wound in contact with each other.

  Further, according to the present invention, the inductance element includes one magnetic core and two coils formed by winding a coated conductor, and each of the coated conductors constituting the two coils has the one magnetic The inductance element is characterized by being wound by being divided into a plurality of areas obtained by dividing the core.

  Further, according to the present invention, each of the coated conductors constituting the two coils is wound, each region of the one magnetic core is divided into two sections, and the total number of the coated conductors is four. It is an inductance element characterized by being divided and wound in each of the areas.

  Further, according to the present invention, each of the coated conductors constituting the two coils is wound, and each region of the one magnetic core is divided into four sections, and the total number of the coated conductors is eight. It is an inductance element characterized by being divided and wound in each of the areas.

  Furthermore, the present invention is characterized in that the dielectric is attached to the outside of the coil formed by dividing the coated conducting wire into the magnetic core and wound, and the conductor is attached to the outer side of the dielectric. It is an inductance element.

  Furthermore, the present invention is characterized in that the dielectric is attached to the inside of the coil formed by dividing the coated conducting wire into the magnetic core and wound, and the conductor is attached to the inner side of the dielectric. It is an inductance element.

  Furthermore, the present invention is the inductance element characterized in that the magnetic core is housed in a core case made of an insulator.

  Furthermore, the present invention provides a core case in which the dielectric is made of an insulator, the magnetic core is housed in the core case, the conductor is attached to the inner surface of the core case, and the outer side of the core case Further, an inductance element is provided, wherein the coil formed by dividing and winding the coated conductive wire is provided.

  According to the present invention, in an inductance element including a magnetic core, a coil, a dielectric, and a conductor, a coil formed by winding a coated conductor around the magnetic core is divided into a plurality of areas obtained by dividing the magnetic core. An element having a wound configuration can be obtained. As a result of this divided winding, the line capacitance in the coil of the inductance element is reduced. As a result, it is possible to cancel the line capacitance in the coil and reduce the amount of dielectrics and conductors required to obtain sufficient high-frequency characteristics, thereby reducing the manufacturing cost of the inductance element. became.

  Therefore, according to the present invention, an inductance element used for applications such as a noise filter in an AC line can obtain a sufficiently large attenuation amount in a high frequency region with respect to common mode noise without using another inductor or the like. An inductance element that can be provided can be provided at low cost.

  Embodiments of the present invention will be described in detail with reference to FIGS. The inductance element in the embodiment described below is configured by including two covered conductors in consideration of applications such as a noise filter, and has a function of sufficiently attenuating common mode noise to a high frequency region. It is. However, the technique of the present invention can be applied to a normal mode inductance element having only one coated conductor without any problem.

  Here, FIG. 1 and FIG. 2 show examples of the shape of the inductance element according to the first embodiment of the present invention. 1A is a front view of an example of the inductance element according to the first embodiment, FIG. 1B is a side view thereof, and FIG. 1C is a cross-sectional view taken along A-A in FIG. FIG. 2 is a cross-sectional view in the radial direction taken along the line BB in FIG. 1B. The inductance element according to the first embodiment of the present invention includes a magnetic core 11, a core case 12 made of an insulator that houses and covers the magnetic core 11, and is wound around the core case 12 to form a coil. Covered conductors 15 and 16, a conductor 13 disposed on the outer peripheral surface of the core case 12 and connected to the ground terminal 17, a dielectric disposed between the covered conductors 15 and 16 and the conductor 13 to insulate them. It is composed of a body 14. The conductor 13 is formed by a method such as sticking a foil-like conductor on the outer peripheral surface of the core case 12, and a metal foil is generally used. A dielectric 14 is disposed on the outer peripheral surface of the conductor 13. The dielectric 14 is made of an insulator, and a resin sheet or the like is preferably used.

  As shown in FIG. 1 (a), the coated conductors 15 and 16 wound around the left and right areas of the core case 12 are divided into a plurality of areas, respectively. Each is divided and wound. In the example of FIG. 1A, the coated conductors 15 and 16 are divided into four areas and wound. Among these, in the divided winding of the coated conductive wire 16, as described as the winding order 18, the winding start is started from the positions of the end portions of the central two areas which are intermediate positions of the four areas. When the winding assembly is produced in one area, the winding moves to the next area, and when the ends of the two areas at both ends are reached, the winding ends. As a result of the divided windings of the covered conductors 15 and 16, a set of windings of approximately ¼ of the total number of windings is produced in each zone. Note that the winding start portions of the coated conductors at the ends of the two central areas are connected to each other, and the coated conductor 16 is composed of only one conductor (line). The series of explanations regarding the above-described divided winding is exactly the same for the covered conductor 15.

  In the example of FIG. 1A, the number of turns of the coated conductors 15 and 16 is 38 turns, and each section has a turn number of 9, 10, 10 and 9 turns in order from the end. In each area, after winding once, it is returned once by lap winding, and it is wound once again, and a total of one and a half reciprocations are performed. An air gap of one turn or more of windings is provided at the outer periphery adjacent portions of the winding assemblies in each zone. By performing such divided winding, from the viewpoint of the line-to-line capacitance, a collection of windings in each divided area is regarded as an independent capacitor. Since these winding assemblies are connected in series with each other, the total line capacitance of one coil is the total of four capacitors connected in series in each area. This is equivalent to the case, and is about 1/4 of the line-to-line capacitance by one winding assembly. As described above, by introducing the split winding to the coil wound around the core, it is possible to reduce the line capacitance in the coil of the inductance element.

  As shown in FIG. 1 (c), the foil-like conductor 13 arranged on the outer peripheral surface of the core case 12 is arranged in a non-contact manner and close to the coil composed of the coated conductors 15 and 16 with the dielectric 14 interposed therebetween. A ground capacitance (hereinafter referred to as CG) is formed as a capacitor between the conductor 13 and the coil. On the other hand, a line capacitance (hereinafter referred to as CL) is generated between the windings of the coil composed of the coated conductors 15 and 16, and CG / CL which is a ratio of the size of the ground capacitance CG and the line capacitance CL. When the value of is larger than a specific value, the line-to-line capacitance CL is sufficiently canceled by the ground capacitance CG, and at this time, the inductance element has a function of sufficiently attenuating the common mode noise to the high frequency region. . As shown in FIG. 2, gaps corresponding to the widths of the windings 1 to 2 are provided between the windings of the separately wound covered conductors 15 and 16.

  In FIG. 2, a ground terminal 17 is attached below the conductor 13, and a part of the region below the dielectric 14 is cut out in order to lead the ground terminal 17 to the outside of the inductance element. . On the other hand, there is a part of the conductor 13 cut out in the upper part of the figure. This area is provided to prevent wrinkles and twists when the conductor 13 is arranged on the circumference of the core case 12. It is a thing. When providing the area | region by which this conductor 13 was cut off, it is necessary to arrange | position to the area | region where the coil | winding by the covered conducting wires 15 and 16 is not formed.

  3 and 4 show an example of the shape of the inductance element according to the second embodiment of the present invention. 3A is a front view of an example of the inductance element according to the second embodiment, FIG. 3B is a side view thereof, and FIG. 3C is a cross-sectional view taken along line AA in FIG. FIG. 4 is a cross-sectional view in the radial direction taken along the line BB in FIG. 3B. The shape and configuration of the inductance element according to the second embodiment are almost the same as those of the inductance element according to the first embodiment shown in FIGS. 1 and 2, and the members used for the inductance element are The magnetic core 11, the core case 12, the coated conductors 15 and 16, the conductor 13, the ground terminal 17 connected thereto, and the dielectric 14 are the same as those in the first embodiment. The coated conductors 15 and 16 are separately wound for each of a plurality of areas. In the example of FIG. 3A, the covered conductors 15 and 16 are divided into four areas and wound. Among these, the order of the division | segmentation winding of the covering conducting wire 16 is as having described as the winding order 18 in Fig.3 (a) and FIG.

  Here, the difference in configuration between the inductance elements in the first and second embodiments is only the shape of the coil formed by winding the coated conductors 15 and 16, and in the case of the second embodiment, a plurality of windings are used. There are no air gaps between the winding assemblies in each section of the magnetic core divided into turn regions. Since the adjacent winding assemblies are in contact with each other at the outer peripheral adjacent portion, the appearance is indistinguishable at first glance from the case where the divided winding is not performed on the coated conductor. However, even though it does not appear so, the coated conductors 15 and 16 are actually divided into four areas and wound as in the case of the first embodiment of the present invention.

  5 and 6 show an example of the shape of the inductance element according to the third embodiment of the present invention. 5A is a front view of an example of an inductance element according to the third embodiment, FIG. 5B is a side view thereof, and FIG. 5C is a cross-sectional view taken along line AA in FIG. FIG. 6 is a cross-sectional view in the radial direction taken along the line BB in FIG. 5B. The shape and configuration of the inductance element according to the third embodiment are substantially the same as those of the inductance element according to the first embodiment shown in FIGS. 1 and 2, and members used for the inductance element are also the same. The magnetic core 11, the core case 12, the coated conductors 15 and 16, the conductor 13, the ground terminal 17 connected to the conductor 13, and the dielectric 14 are the same as those in the first embodiment. On the other hand, the coated conductors 15 and 16 are separately wound for each of a plurality of areas. However, in the example of FIG. 5A, the covered conductors 15 and 16 are not divided into four places but are divided into two areas and wound. It is lined. Among these, the order of the division | segmentation winding of the covering conducting wire 16 is as having described as the winding order 18 in Fig.5 (a) and FIG.

  Here, the difference in the configuration of the inductance elements in the first and third embodiments is only the shape of the coil formed by winding the coated conducting wires 15 and 16, and the areas of the divided windings of the coated conducting wires 15 and 16 are respectively different. It is divided and wound in two areas instead of four. Further, in the case of the third embodiment, as in the case of the first embodiment, a gap is provided between each of the winding assemblies divided and wound in a plurality of sections of the magnetic core, As shown in FIG. 6, a gap corresponding to the width of one or two turns is provided between the winding assemblies of the coated conductors 15 and 16 that are separately wound. .

  In each of the inductance elements in the first to third embodiments, a foil-like conductor is disposed on the outer peripheral surface of the core case that houses the magnetic core, and then a dielectric that is an insulator on the outer peripheral surface. In addition, the outer sides of the magnetic core, core case, conductor, and dielectric are wound around with a coated conductive wire to form a separately wound coil. On the other hand, as in the case of the example shown in FIG. 13, the conductor and the dielectric are provided on the outer peripheral surface of the coil by the coated conductor, and the coil can be configured by winding only the magnetic core and the core case. . In this case, the size of the ground capacitance generated between the conductor and the coil with the dielectric interposed therebetween is determined mainly by the usage amounts of the conductor and the dielectric, as in the first to third embodiments. The conductor is not affected by the difference in shape whether it is inside or outside the coil. Therefore, when the shape of the separately wound coil and the areas of the conductor and the dielectric used for the inductance element are the same, the frequency characteristics of the inductance element are almost the same regardless of the arrangement of the conductor and the dielectric.

  In the first to third embodiments, the frequency characteristic (spectrum) of the attenuation amount of the common mode noise is measured by measuring the ratio of the output voltage to the input voltage to the inductance element while changing the frequency. Obtainable. Inductance elements used in AC line filters generally have a resonance frequency in the range of 100 kHz to 1 MHz or in the vicinity thereof, and the frequency characteristics are determined by the inductance value of the element in a frequency region lower than the resonance frequency. On the other hand, in the frequency range of 1 MHz to 10 MHz, which is higher than the resonance frequency, or the frequency region in the vicinity thereof, the frequency characteristics are determined by the line capacitance generated between the windings of the coil by the coated conductor, and the frequency increases as the line capacitance increases. The larger the value, the lower the frequency characteristic, and the attenuation of common mode noise tends to decrease. As in the case of the examples of FIGS. 12 and 13, the common mode noise attenuation is reduced by introducing a structure composed of a conductor and a dielectric inside the inductance element to form a sufficiently large ground capacitance. This can be prevented by canceling the capacitance between the lines.

  Here, when the divided winding is performed on the coil of the coated conductor, the line capacitance generated between the windings of the coil can be reduced to some extent, so that the conductor and the dielectric introduced into the inductance element to form the ground capacitance can be reduced. The amount used can be reduced without degrading the frequency characteristics. The inventors measured the frequency characteristics of each coil by winding the coil and measuring the variation of the line capacitance resulting from it, as well as making an inductance element with a different conductor and dielectric area. went. As a result, it was confirmed that good frequency characteristics can be obtained even when the amount of conductors and dielectrics used is reduced when split winding is performed.

(Example 1: Production of inductance element)
A ferrite toroidal core having an outer diameter of 25 mm, an inner diameter of 15 mm, and a thickness of 12 mm was used as a magnetic core, and the toroidal core was housed in a core case made of nylon resin having a thickness of 0.5 mm. An inner portion of the inner diameter of the core case is a circular gap, and one arm-shaped structure is provided so as to cross the center of the circular gap. In the following description, the orientation is determined so that the longitudinal direction of the arm-shaped structure is the vertical direction. Next, a copper foil having a width of 8 mm and a thickness of 70 μm was wound as a conductor on the outer peripheral surface of the core case for one turn. The winding start point and winding end point are both above the core case, and a gap is provided between the winding start point and the winding end point. The length of the conductor provided on the outer peripheral surface of the core case is 78 mm, and the width of the gap between the winding start point and the winding end point is 3.6 mm. The conductor is arranged in a band shape at the center in the thickness direction on the outer peripheral surface of the core case. Since the outer thickness of the core case is 16 mm, the surface of the core case is exposed on both sides of the conductor.

  Further, a dielectric made of a silicone sheet having a width of 12 mm and a thickness of 0.5 mm was wound on the outer peripheral surface of the conductor for one turn. The winding start point and winding end point of the dielectric are both below the core case, and the length is 78 mm, the same as the copper foil. The gap between the winding start point and the winding end point is 4.0 mm. The dielectric is completely covered with the conductor in places other than the gap, and the width of the dielectric is narrower than the outer thickness of the core case, so the surface of the core case is exposed on both sides of the dielectric. ing.

  Two copper wires having a resin coating with a wire diameter of 0.8 mm were wound around the magnetic core, the core case, the conductor, and the dielectric to form a coil. One copper wire is arranged in each of the left and right areas of the core case partitioned by the arm-shaped structure, and winding is advanced in both the upper and lower directions from the left and right central portions of the core case. The winding of the copper wire is a divided winding having four areas, and four divided winding areas are provided in the left and right regions of the core case. The total number of turns in the left and right regions is 38 turns, and the number of turns is 9 turns, 10 turns, 10 turns, and 9 turns in order from the top in each of the 4 places. In each area, once winding on the core case, the winding is advanced so that the outer side of the winding returns to the opposite direction, and then the outer winding is wound once again. After finishing, it goes to the next area. Winding is performed between the zones with a gap of one turn or more. It should be noted that no winding is performed on the uppermost and lowermost regions of the core case where a gap is provided in the conductor or dielectric.

  After the coil was formed by a series of windings of the coated conductor, the ends of the coated conductor were taken out from the left and right sides of the core case. Since two coated conductors are wound around the inductance element, the number of ends of the coated conductors to be taken out is four. Of the ends of the coated conductors taken out from the left and right sides of the core case, one is an input terminal and one is an output terminal. One input terminal and one output terminal are taken out from the left and right sides of the core case. Furthermore, a ground terminal was connected to the conductor exposed from the dielectric gap below the core case. A total of ten inductance elements were produced by the above method, and these elements were referred to as Example 1. Its shape is the same as that of the inductance element of the present invention in the first embodiment shown in FIG. 1 and FIG.

  The ground capacitance formed between the coil and the conductor facing each other across the dielectric is considered to be proportional to the opposing area of the conductor and inversely proportional to the thickness of the dielectric because a capacitor is formed. However, when a silicone sheet or the like is used as a dielectric, there is a limit to making the silicone sheet thinner in order to ensure the moldability of the silicone sheet, the workability of the winding operation, and the insulation between the conductor and the coil. is there. In particular, the thickness of about 0.5 mm used in Example 1 is indispensable from the viewpoint of safety standards in order to withstand the compression by the coil winding and to ensure the insulation between the conductor and the coil. is there. Therefore, in order to reduce the amount of dielectric used to reduce the cost of the inductance element, it is actually necessary to use a 0.5 mm thick silicone sheet and then reduce the area used. Become.

(Example 1: Evaluation of capacitance between lines)
As an evaluation of the electrical characteristics of the manufactured inductance element of Example 1, the line capacitance was measured. Without connecting anything to the ground terminal, the input terminal and the output terminal taken out from either the left or right of the core case were connected to a spectrum analyzer, and the impedance between both terminals was measured while changing the frequency. The results are shown as a graph of Example 1 in FIG. FIG. 7 is a graph showing the relationship between the frequency of each inductance element and the line capacitance at that time. The horizontal axis represents frequency (MHz), and the vertical axis represents the value of line capacitance (pF). The frequency measurement range in the graph is between 0.1 MHz and 40 MHz. Note that the values in the graph of FIG. 7 show one of the measurement results having an average characteristic among the ten measured values of the inductance elements in Example 1. In practice, there was almost no variation in the measured values between the inductance elements, and all 10 measured values were almost the same as the graph of Example 1 in FIG.

  As can be seen from the graph of FIG. 7, in the frequency range of 1 MHz to 10 MHz, the line capacitance of the inductance element of Example 1 showed a very small value of 10 pF or less. It can be considered that the reason why the line capacity is reduced in this way is that the coil made of the coated conductor is formed by split winding.

(Example 1: Evaluation of damping characteristics)
As an evaluation of the electrical characteristics of the manufactured inductance element of Example 1, the attenuation characteristics were measured. First, the ground terminal of the inductance element is grounded, the input / output terminals taken out from the left and right sides of the core case are connected to the impedance analyzer, and the attenuation amount (output voltage / input voltage) is in the frequency range of 0.01 MHz to 100 MHz. Measured over The result is shown by a solid line in the graph of FIG. 8 as a measured value of a conductor width of 8 mm. Here, FIG. 8 is a graph showing the relationship between the frequency of each inductance element and the attenuation characteristic at that time. The horizontal axis represents frequency (MHz), and the vertical axis represents attenuation characteristics, ie, output voltage / input voltage value (dB).

  The frequency of the measurement range in the graph is between 0.01 MHz and 100 MHz. In FIG. 8, it can be seen that in the frequency range of 1 MHz to 10 MHz, which is a frequency region higher than the resonance frequency, the attenuation characteristic in the graph in the case of the conductor width of 8 mm is sufficiently low, and a good attenuation characteristic is obtained. Note that the values in the graph of FIG. 8 indicate one of the measurement results having an average characteristic among the ten measurement values obtained by the ten inductance elements of Example 1 in total. However, since there was actually little variation in measured values between the inductance elements, all 10 measured values are almost the same as the graph of Example 1 in FIG.

(Example 2)
Ten inductance elements that differ only in the values of the widths of the conductor and the dielectric from those in the case of Example 1 were produced, and Example 2 was obtained. In Example 2, the width of the conductor is 5 mm, and the width of the dielectric is 9 mm. The manufacturing method of the inductance element is exactly the same as in the case of Example 1, and the coil produced by winding the coated conductor is also divided into four parts. As an evaluation of the electrical characteristics of the inductance element in the manufactured Example 2, the attenuation characteristics were measured. The result is shown in the graph of FIG. 8 by a dotted line as a measured value of a conductor width of 5 mm. The measurement method is exactly the same as in the case of Example 1, and the value of this graph shows one of the measurement results having an average characteristic among the total of 10 measurement values by 10 inductance elements. It is. In addition, the dispersion | variation of each measured value of 10 times was very small.

  From the graph of FIG. 8, in the frequency range of 1 MHz to 10 MHz, which is a frequency region higher than the resonance frequency, the attenuation characteristic in the graph when the conductor width is 5 mm is almost the same as in the case of Example 1 (measured value of conductor width of 8 mm). It can be seen that the same damping characteristics as in Example 1 are obtained. This is because the line-to-line capacitance in the second embodiment is sufficiently low due to the divided winding of the coil. Therefore, even when the area of the conductor or dielectric is reduced to reduce the amount of use, the normal mode It shows that sufficient attenuation characteristics can be obtained as an inductance element for attenuating noise. In addition, although the measured value of the line capacitance in the case of Example 2 is not shown as a graph, the difference between the dimensions of the conductor and the dielectric is not particularly involved in the line capacitance in the inductance element. The frequency characteristic of the capacitance may be the same as that in the first embodiment.

(Example 3)
Ten inductance elements differing only in the width values of the conductors and the dielectrics from those in the first and second embodiments were manufactured as a third embodiment. In Example 3, the width of the conductor is 3 mm, and the width of the dielectric is 7 mm. The manufacturing method of the inductance element is exactly the same as in the case of Example 1, and the coil produced by winding the coated conductor is also divided into four parts. As an evaluation of the electrical characteristics of the inductance element in the manufactured Example 2, the attenuation characteristics were measured. The result is shown in the graph of FIG. 8 by a one-dot chain line as a measured value of a conductor width of 3 mm. The measurement method is exactly the same as in the case of Example 1, and the value of this graph shows one of the measurement results having an average characteristic among the total of 10 measurement values by 10 inductance elements. It is. In addition, the dispersion | variation of each measured value of 10 times was very small.

  From the graph of FIG. 8, in the frequency range of 1 MHz to 10 MHz, which is a frequency region higher than the resonance frequency, the attenuation characteristics in the graph when the conductor width is 3 mm are almost the same as those of the first and second embodiments. It can be seen that good attenuation characteristics are obtained as in the case of Example 1 and Example 2. This is because the line capacity in the case of Example 3 is sufficiently low due to the divided winding of the coil, so that the area of the conductor and the dielectric is made smaller than in the case of Example 2, and the amount of use is reduced. It shows that even when the frequency is reduced, sufficient attenuation characteristics can still be obtained as an inductance element for attenuating common mode noise. The frequency characteristic of the line capacitance in the case of the third embodiment may be the same as that of the first embodiment as in the case of the second embodiment.

(Examples 4 to 6)
Inductance elements were produced in the same manner as in Examples 1 to 3, and Examples 4 to 6 were obtained. The width of the copper foil used as a conductor in the inductance element of Example 4 is 8 mm, and the width of the dielectric material which is a silicone sheet is 12 mm, which is the same as in Example 1. Similarly, in the case of Example 5, the conductor is 5 mm wide and the dielectric is 9 mm wide. In Example 6, the conductor is 3 mm wide and the dielectric is 7 mm wide. In the case of Example 2 and Example 3, respectively. Is the same. The difference between each of the inductance elements in the first to third embodiments is that, in a coil formed by dividing and winding a coated conductor, areas adjacent to each other among four winding areas provided on both left and right sides are provided. It is only that no gap is provided between them. The point that the divided winding is performed in the four areas is the same as in the case of the first to third embodiments, but there is no gap between the divided areas. It doesn't look like it is. The shape is the same as that of the inductance element of the present invention in the second embodiment shown in FIGS.

  Ten inductance elements of Examples 4 to 6 were produced in the shape described above, and the evaluation of the electrical characteristics was performed by evaluating the line capacitance and the attenuation characteristics. Among these, the same evaluation as the case of Example 1 was performed on the inductance element of Example 4 with respect to the line capacitance, and 10 inductance elements were measured for each Example. The results are shown as a graph in FIG. This graph shows one of the measurement results of Example 4 that had an average characteristic. This graph almost coincided with the graph of Example 1 indicated by the solid line in FIG. Therefore, in FIG. 7, the graphs of Example 1 and Example 4 overlap each other, and the difference between the two is not known in the graph.

  According to the graph of FIG. 7, the frequency characteristic of the line capacitance when the divided winding is performed in the inductance element hardly changes when no gap is provided between the coil areas as compared with the case where there is a gap. That is, it can be seen that the line-to-line capacitance in the coil winding in the inductance element does not depend on whether or not a gap is provided between the divided winding areas. The difference between the inductance elements of Examples 4 to 6 is only the width of the conductor and the dielectric, and the difference in the dimensions of the conductor and the dielectric is not particularly related to the line capacitance. Therefore, the frequency characteristics of the line capacitance of each inductance element in the fifth and sixth embodiments may be the same as those in the fourth embodiment.

  Next, the attenuation characteristics of each of the ten inductance elements in Examples 4 to 6 were evaluated. The evaluation method was exactly the same as in Example 1, and frequency measurement was performed on each of ten inductance elements in each example. The results are shown as a graph in FIG. Here, FIG. 9 is a graph showing the relationship between the frequency of each inductance element in Examples 4 to 6 and the attenuation characteristic at that time. The horizontal axis represents frequency (MHz), and the vertical axis represents attenuation characteristics, ie, output voltage / input voltage value (dB). The frequency range of the measurement range in the graph is 0.01 MHz to 100 MHz. In addition, these graphs each show one which became an average characteristic among each measurement result in Examples 4-6.

  The values in the graph of FIG. 9 substantially match the values of the graphs of Examples 1 to 3 shown in FIG. That is, each frequency of Example 4 indicated by a solid line as a graph with a conductor width of 8 mm in FIG. 9, Example 5 indicated by a dotted line as a graph with a conductor width of 5 mm, and Example 6 indicated by a dashed line as a graph with a conductor width of 3 mm. The characteristic is a sufficiently low value as in the case of Examples 1 to 3 in the frequency range of 1 MHz to 10 MHz, which is a frequency range higher than the resonance frequency. From this, it can be seen that in Examples 4 to 6, good attenuation characteristics sufficient as an inductance element are obtained.

(Examples 7 and 8, Comparative Example 1)
Inductance elements were produced in the same manner as in Examples 1 to 3, and Examples 7 and 8 and Comparative Example 1 were used, respectively. The width of the copper foil used as a conductor in the inductance element of Example 7 is 8 mm, and the width of the dielectric material which is a silicone sheet is 12 mm, which is the same as in Example 1. Similarly, in the case of Example 8, the conductor is 5 mm wide and the dielectric is 9 mm wide. In Comparative Example 1, the conductor is 3 mm wide and the dielectric is 7 mm wide. In the case of Example 2 and Example 3, respectively. Is the same. The difference from Examples 1 to 3 in each of these inductance elements is that the area of the divided winding of the coated conductor is not four at the left and right but at two. A gap of at least one turn of winding is provided between two winding areas. Its shape is the same as that of the inductance element of the present invention in the third embodiment shown in FIGS.

  Ten inductance elements of Examples 7 and 8 and Comparative Example 1 were manufactured in the shape described above, and the evaluation of the electrical characteristics was performed by evaluating the line capacitance and the attenuation characteristics. Among these, regarding the line capacitance, the same evaluation as in Example 1 was performed on the inductance element of Example 7, and 10 inductance elements were measured for each Example. The result is shown as a dotted line in FIG. This graph shows one of the measurement results of Example 7 that had an average characteristic. Compared with the graphs of Example 1 and Example 4 shown by the solid line in FIG. 7, the graph of Example 7 has a value of the line capacitance of about twice in the frequency range of 1 MHz to 10 MHz.

  That is, by dividing the divided winding area of the inductance element from four to two per coil, the line capacitance is doubled in the frequency range of 1 MHz to 10 MHz. Therefore, it can be seen that the line-to-line capacitance in the winding of the coil in the inductance element is increased or decreased by the split winding method. The difference between the inductance elements of Examples 7 and 8 and Comparative Example 1 is only the width of the conductor and the dielectric, and the difference in the dimensions of the conductor and the dielectric is not particularly related to the line capacitance. Therefore, the frequency characteristics of the line capacitance of each inductance element in Example 8 and Comparative Example 1 may be the same as in Example 7.

  Next, the attenuation characteristics of the ten inductance elements in Examples 7 and 8 and Comparative Example 1 were evaluated. The evaluation method was exactly the same as in Example 1, and frequency measurement was performed on each of ten inductance elements in each example. The results are shown as a graph in FIG. Here, FIG. 10 is a graph showing the relationship between the frequency and the attenuation characteristic at that time of each inductance element in Examples 7 and 8 and Comparative Example 1. The horizontal axis represents frequency (MHz), and the vertical axis represents attenuation characteristics, ie, output voltage / input voltage value (dB). The frequency of the measurement range in the graph is between 0.01 MHz and 100 MHz. These graphs respectively show one of the measurement results in Examples 7 and 8 and Comparative Example 1 that has an average characteristic.

  10 is compared with the values of the graphs of Examples 1 to 3 shown in FIG. 8, the same characteristic values as those of Examples 1 to 3 are obtained in the cases of Example 7 and Example 8. It has been. That is, each frequency characteristic of Example 7 indicated by a solid line as a graph with a conductor width of 8 mm in FIG. 10 and Example 8 indicated by a dotted line as a graph with a conductor width of 5 mm is a frequency in a frequency region higher than the resonance frequency In the region of 1 MHz to 10 MHz, the value is sufficiently low as in Examples 1 to 3. From this, it can be seen that in Examples 7 and 8, good attenuation characteristics sufficient for an inductance element are obtained. In Examples 7 and 8, the line capacitance of the inductance element is higher than that in Examples 1 to 3, but this line capacitance is sufficiently canceled by the conductor having a width of 8 mm or 5 mm and the dielectric at that time. Therefore, it is considered that a good attenuation characteristic is obtained.

  On the other hand, in the case of the comparative example 1, according to FIG. 10, the attenuation characteristics are slightly higher than those in the case of the first to third embodiments in the frequency range of 1 MHz to 10 MHz. This is because the line capacitance of the inductance element in Comparative Example 1 cannot be sufficiently canceled by the conductor having a width of 3 mm and the dielectric at that time, and the influence of the line capacitance of the inductance element remains. As a result, the amount of attenuation is considered to be slightly smaller than in Examples 7 and 8. In other words, when the number of divided winding areas of the coated conductor wire is two, the conductor width cannot be reduced to 3 mm, and it is necessary to keep the range of use reduction to 5 mm. Therefore, it is possible to reduce the cost of inductance elements by reducing the amount of conductors and dielectrics used, even when there are two separate winding areas. In this case, however, the amount of conductors and dielectrics to be reduced is reduced. It can be seen that there is a certain limit.

(Comparative Examples 2 to 4)
Inductance elements were produced in the same manner as in Examples 1 to 3, and Comparative Examples 2 to 4 were used. However, in Comparative Examples 2 to 4, no split winding is performed on the coil made of the coated conductor. Among these, the width of the copper foil used as the conductor in Comparative Example 2 is 8 mm, and the width of the dielectric material which is a silicone sheet is 12 mm, which is the same as in the case of Example 1. Similarly, in the case of Comparative Example 3, the conductor is 5 mm wide and the dielectric is 9 mm wide. In Comparative Example 4, the conductor is 3 mm wide and the dielectric is 7 mm wide. Is the same. The shapes of these inductance elements are the same as those of the inductance elements shown in FIG. Of these, Comparative Example 2 corresponds to the case of an inductance element in which a sufficient width is secured for the conductor and the dielectric.

  Ten inductance elements of Comparative Examples 2 to 4 were produced with the shapes described above, and the evaluation of the electrical characteristics was performed by evaluating the line capacitance and the attenuation characteristics. Among these, regarding the line capacitance, the same evaluation as in Example 1 was performed on the inductance element of Comparative Example 2, and 10 inductance elements were measured for each Example. The result is shown as a one-dot chain line in FIG. This graph shows one of the measurement results of Comparative Example 2 that has an average characteristic. Compared with the graphs of Example 1 and Example 4 indicated by the solid line in FIG. 7, the graph of Comparative Example 2 has a line capacitance of about four times in the frequency range of 1 MHz to 10 MHz.

  In other words, when the winding of the inductance element is not divided (only one zone is used), the line capacitance is 4 MHz in the frequency range of 1 MHz to 10 MHz compared to the case where the divided winding is performed in the 4 zones. That is a doubling. Therefore, also in the case of Example 7, it can be seen that the line-to-line capacitance in the winding of the coil in the inductance element increases as the number of divided winding areas decreases. The difference between the inductance elements of Comparative Examples 2 to 4 is only the width of the conductor and the dielectric, and the difference between the conductor and the dielectric is not particularly related to the line capacitance. Therefore, the frequency characteristics of the line capacitance of the inductance elements in Comparative Example 3 and Comparative Example 4 may be the same as those in Comparative Example 2.

  Next, the attenuation characteristics of the 10 inductance elements in Comparative Examples 2 to 4 were evaluated. The evaluation method was exactly the same as in Example 1, and frequency measurement was performed on each of ten inductance elements in each example. The results are shown as a graph in FIG. Here, FIG. 11 is a graph showing the relationship between the frequency of each inductance element and the attenuation characteristic at that time. The horizontal axis represents frequency (MHz), and the vertical axis represents attenuation characteristics, ie, output voltage / input voltage value (dB). In the graph, the frequency of the measurement range is between 0.01 MHz and 100 MHz. In addition, these graphs each show one which became an average characteristic among each measurement result in Comparative Examples 2-4.

  When comparing the values of the graph of FIG. 11 and the values of the graphs of Examples 1 to 3 shown in FIG. 8, the same frequency measurement values as in Examples 1 to 3 are obtained only in the case of Comparative Example 2. ing. That is, each frequency characteristic in the case of the comparative example 2 shown by the solid line as a graph of the conductor width of 8 mm in FIG. This is a sufficiently low value. In the case of the comparative example 2, although the line capacitance of the inductance element is higher than those in the first to third embodiments, the line capacitance can be sufficiently canceled by the conductor having a width of 8 mm and the dielectric at that time. Thus, it is considered that a good attenuation characteristic is obtained.

  On the other hand, in the case of the comparative example 3, according to FIG. 11, the value of the graph of the attenuation characteristic is slightly higher in the frequency range of 1 MHz to 10 MHz than in the case of the first to third embodiments, and in the case of the comparative example 4, the value is considerably high. ing. This is because the line capacitance of the inductance element in Comparative Examples 3 and 4 cannot be sufficiently canceled out by the conductor having a width of 3 mm or 5 mm and the dielectric at that time, and therefore, the influence of the line capacitance of the inductance element. As a result, the amount of attenuation is considered to be smaller than in the case of Comparative Example 2. Therefore, in the case of an inductance element that does not introduce split windings in the coated conductor, the conductor width cannot be reduced to less than 8 mm in order to obtain good attenuation characteristics. Therefore, the cost of the inductance element cannot be reduced.

Table 1 shows the number of divided windings of each of the inductance elements in Examples 1 to 8 and Comparative Examples 1 to 4, the presence or absence of a gap between the windings of each of the divided windings, and the thickness. The dimensions of the conductor excluding the thickness (width × length and area (mm ² )), the dimensions of the dielectric (width × length and area (mm ² )), and the determination results of their attenuation characteristics are shown. In addition, when the division | segmentation winding was not performed, "-" was described in the item of space | gap. In the determination of the attenuation characteristic, the case where the attenuation characteristic in the frequency range of 1 MHz to 10 MHz is equivalent to Comparative Example 2 corresponding to the case where a sufficient width is ensured for the conductor and the dielectric is “◯”, which is inferior to Comparative Example 2. Cases are indicated by “×”. The thickness of the conductor and the dielectric in each inductance element is the same, the conductor is 70 μm thick, and the dielectric is 0.5 mm.

  According to Table 1, in the case of Examples 1 to 6 in which the area of the divided winding is divided into four, even if the conductor width is reduced to 3 mm, excellent attenuation characteristics equivalent to those in Comparative Example 2 are obtained. You can see that In this case, whether or not a gap is provided between the divided areas does not particularly affect the attenuation characteristics of the inductance element. On the other hand, in Examples 7 and 8 and Comparative Example 1 in which the divided winding area is divided into two, good attenuation characteristics can be obtained when the conductor width is 5 mm, but the conductor width is reduced to 3 mm. In this case, the value of the attenuation characteristic becomes high, and in this case, a sufficient attenuation characteristic cannot be obtained. However, since the attenuation characteristic is good when the width of the conductor is 5 mm, the effect of improving the attenuation characteristic to some extent is obtained by the divided winding, although it is not as much as when the divided winding area is divided into four. Therefore, it can be seen that even when the divided winding area is divided into two, it is possible to reduce the area of the conductor and dielectric to be used and to reduce the cost of the inductance element.

  On the other hand, in Comparative Examples 2 to 4 where split winding is not performed, it is understood that sufficient attenuation characteristics are not obtained except for Comparative Example 2, which is a case where a sufficient width is ensured for the conductor and the dielectric. . That is, it can be seen that when the split winding is not performed, the amount of conductors and dielectrics used cannot be reduced as compared with the case of Comparative Example 2, and the cost of the inductance element cannot be reduced.

  As described above, according to the embodiment of the present invention, by using the coil with the coated conductor of the inductance element as a split winding, the amount of conductors and dielectrics required for improving the attenuation characteristics can be reduced. As a result, the cost of the inductance element can be reduced. Further, the above description is for explaining the effect in the case of the embodiment of the present invention, and is not intended to limit the invention described in the claims or to reduce the scope of the claims. Absent. Moreover, each part structure of this invention is not restricted to the said embodiment, A various deformation | transformation is possible within the technical scope as described in a claim.

The example of the inductance element which concerns on the 1st Embodiment of this invention. 1A is a front view, FIG. 1B is a side view, and FIG. 1C is a radial cross-sectional view taken along line AA of FIG. 1A. Sectional drawing of the circumferential direction in BB of FIG.1 (b) of the inductance element which concerns on the 1st Embodiment of this invention. The example of the inductance element which concerns on the 2nd Embodiment of this invention. 3A is a front view, FIG. 3B is a side view, and FIG. 3C is a cross-sectional view taken along line AA in FIG. 3A. Sectional drawing of the circumferential direction in BB of FIG.3 (b) of the inductance element which concerns on the 2nd Embodiment of this invention. The example of the inductance element which concerns on the 3rd Embodiment of this invention. 5 (a) is a front view, FIG. 5 (b) is a side view, and FIG. 5 (c) is a cross-sectional view taken along the line AA in FIG. 5 (a). Sectional drawing of the circumferential direction in BB of FIG.5 (b) of the inductance element which concerns on the 3rd Embodiment of this invention. The graph which shows the relationship between the frequency of each inductance element of this invention and a comparative example, and the capacity | capacitance between lines. The horizontal axis is frequency (MHz), and the vertical axis is the value of line capacitance (pF). The graph which shows the relationship between the frequency of each inductance element of this invention, and an attenuation characteristic. The horizontal axis represents frequency (MHz), and the vertical axis represents attenuation characteristics (dB). The graph which shows the relationship between the frequency of each inductance element of this invention, and an attenuation characteristic. The horizontal axis represents frequency (MHz), and the vertical axis represents attenuation characteristics (dB). The graph which shows the relationship between the frequency of each inductance element of this invention and a comparative example, and an attenuation characteristic. The horizontal axis represents frequency (MHz), and the vertical axis represents attenuation characteristics (dB). The graph which shows the relationship between the frequency of each inductance element of a comparative example, and attenuation characteristics. The horizontal axis represents frequency (MHz), and the vertical axis represents attenuation characteristics (dB). The front view of the inductance element of a reference example. The front view of the inductance element of a reference example.

Explanation of symbols

11 Magnetic core 12, 22 Core case 13, 23 Conductor 14, 24 Dielectric 15, 16, 25, 26 Coated conductor 17, 27 Ground terminal 18, 28 Winding order

Claims (11)

A magnetic core; a coil formed by winding a coated conductor around the magnetic core; a dielectric provided in contact with or close to at least a part of the coil; and the magnetic core being electrically insulated; Is an inductance element that forms a capacitor and further includes a conductor having a ground terminal,
The inductance element according to claim 1, wherein the coated conductor is divided and wound into a plurality of areas obtained by dividing the magnetic core.   The inductance element according to claim 1, wherein the magnetic core is a toroidal core.   The said covered conducting wire each divided | segmented and wound by each of the several area of the said magnetic core is wound with the space | gap provided between adjacent areas, or it is wound. Item 3. The inductance element according to Item 2.   The covered conductors that are wound separately in each of the plurality of areas of the magnetic core are not provided with a gap between adjacent areas, and the covered conductors wound in both areas are The inductance element according to claim 1, wherein the inductance element is wound in contact with each other. Each of the inductance elements includes one magnetic core and two coils formed by winding a coated conductor,
Each of the said covered conducting wire which comprises the said 2 coil is each divided | segmented and wound in the some area formed by dividing | segmenting the said 1 magnetic core, The one of Claim 1 thru | or 4 characterized by the above-mentioned. The inductance element according to item 1.   Each of the coated conductors constituting the two coils is wound, each region of the one magnetic core is divided into two sections, and each of the coated conductors is divided into a total of four sections. The inductance element according to claim 5, wherein the inductance element is wound.   Each of the coated conductors constituting the two coils is wound, each region of the one magnetic core is divided into four sections, and each of the coated conductors is divided into a total of eight sections. The inductance element according to claim 5, wherein the inductance element is wound.   The dielectric material is attached to the outside of the coil formed by dividing the coated conducting wire into the magnetic core and wound, and the conductor is attached to the outside of the dielectric material. 8. The inductance element according to any one of 7 above.   2. The dielectric according to claim 1, wherein the dielectric is attached to an inner side of the coil formed by dividing the coated conducting wire into the magnetic core and wound, and the conductor is further attached to the inner side of the dielectric. 8. The inductance element according to any one of 7 above.   The inductance element according to claim 1, wherein the magnetic core is housed in a core case made of an insulator.   The dielectric is a core case made of an insulator, wherein the magnetic core is housed in the core case, the conductor is attached to the inner surface of the core case, and the covered conductor is on the outer side of the core case. The inductance element according to any one of claims 1 to 7, wherein the coil that is divided and wound is provided.

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