JP2007142931A - Noise filter - Google Patents

Noise filter Download PDF

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JP2007142931A
JP2007142931A JP2005335595A JP2005335595A JP2007142931A JP 2007142931 A JP2007142931 A JP 2007142931A JP 2005335595 A JP2005335595 A JP 2005335595A JP 2005335595 A JP2005335595 A JP 2005335595A JP 2007142931 A JP2007142931 A JP 2007142931A
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noise filter
capacitor
electrode
ground electrode
electrodes
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Yu Ishiwatari
祐 石渡
Takahiro Azuma
貴博 東
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Murata Manufacturing Co Ltd
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Murata Manufacturing Co Ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F17/00—Fixed inductances of the signal type 
    • H01F17/04—Fixed inductances of the signal type  with magnetic core
    • H01F17/045—Fixed inductances of the signal type  with magnetic core with core of cylindric geometry and coil wound along its longitudinal axis, i.e. rod or drum core
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F17/00—Fixed inductances of the signal type 
    • H01F2017/0093—Common mode choke coil

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Filters And Equalizers (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a noise filter of which a product cost is low, which is easy to manufacture and further, in which component mounting error is not almost generated. <P>SOLUTION: A noise filter 1 comprises a common mode choke coil unit 2, a first capacitor unit 5, and second and third capacitor units 6, 7. The common mode choke coil unit 2 has a closed magnetic path structure wherein first and second winding wires 4-1 and 4-2 are wound around a core 3 and a top plate 35 is attached to the core 3. The first capacitor unit 5 comprises first electrodes 51, 52 formed in a flange 31, and is connected to both terminal parts of one of the first and second winding wires 4-1 and 4-2. Furthermore, the second and third capacitor units 6, 7 comprise second and third electrodes 61 and 71 and a ground electrode 67 formed in a flange 32 and are connected in series to both terminal parts of the other first and second winding wires 4-1 or 4-2 so as to be grounded via the ground electrode 67. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

この発明は、電源供給線路で生じたノーマルモードノイズやコモンモードノイズを除去するためのノイズフィルタに関するものである。   The present invention relates to a noise filter for removing normal mode noise and common mode noise generated in a power supply line.

従来、この種のノイズフィルタとして、例えば特許文献１に開示の技術がある。
このノイズフィルタは、台座と、トロイダル型のノイズフィルタと、２つのチップ型のＣｘコンデンサと、１対のチップ型のＣｙコンデンサとより構成されており、コモンモードノイズをノイズフィルタと１対のＣｙコンデンサとによって除去し、ノーマルモードノイズを２つのＣｘコンデンサで除去することができる。 Conventionally, as this type of noise filter, for example, there is a technique disclosed in Patent Document 1.
The noise filter includes a pedestal, a toroidal type noise filter, two chip type Cx capacitors, and a pair of chip type Cy capacitors. The normal mode noise can be removed with two Cx capacitors.

特開平１０−０４１１６５号公報Japanese Patent Laid-Open No. 10-041165

しかし、上記した従来のノイズフィルタでは、次のような問題がある。
台座とノイズフィルタと２つのチップ型のＣｘコンデンサと１対のチップ型のＣｙコンデンサとで構成されるため、部品点数が多く、その分製品コストが高く付く。
また、ノイズフィルタの上に取り付けられる台座が複雑な形状及び構造を呈しており、このため、製品製造に煩雑な作業と多くの手間を必要とする。
さらに、製造時に、２つのチップ型のＣｘコンデンサと、１対のチップ型のＣｙコンデンサとを別々に台座に取り付けるため、コンデンサの取付ミスが生じ易い。 However, the conventional noise filter described above has the following problems.
Since the pedestal, the noise filter, the two chip-type Cx capacitors, and the pair of chip-type Cy capacitors are included, the number of parts is large, and the product cost is increased accordingly.
In addition, the pedestal mounted on the noise filter has a complicated shape and structure, which requires complicated work and a lot of labor for product manufacture.
Furthermore, since two chip-type Cx capacitors and a pair of chip-type Cy capacitors are separately mounted on the pedestal during manufacturing, capacitor mounting mistakes are likely to occur.

この発明は、上述した課題を解決するためになされたもので、製品コストが安く且つ製造が容易で、しかも部品の取付ミス等がほとんど生じないノイズフィルタを提供することを目的とする。   The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a noise filter that is low in product cost, easy to manufacture, and hardly causes component mounting errors.

上記課題を解決するために、請求項１の発明は、コアの巻芯に巻回された第１及び第２巻線を有するコモンモードチョークコイル部と、第１及び第２巻線の一方端部間に接続された第１のコンデンサ部と、第１及び第２巻線の他方端部間に直列に接続され且つ互いの接続部位において接地可能な第２及び第３のコンデンサ部とを具備したノイズフィルタであって、互いに対向する１対の第１電極を、一方の鍔の表面に形成すると共に、１対の第１電極を第１及び第２巻線の一方端部にそれぞれ接続することにより、第１のコンデンサ部を構成し、互いに対向する第２電極及び接地電極を、他方の鍔の表面に形成すると共に、第２電極を、第１巻線の他方端部に接続することにより、第２のコンデンサ部を構成し、接地電極と互いに対向する第３電極を、他方の鍔の表面に形成すると共に、第３電極を、第２巻線の他方端部に接続することにより、第３のコンデンサ部を構成した。
かかる構成により、ノイズフィルタの第１巻線の両端部を、電源供給線路の一方の線路に接続し、第２巻線の両端部を他方の線路に接続することができる。これにより、１対の電源電圧が第１及び第２巻線を介して電源供給線路を伝わる。
そして、ノーマルモードノイズが一方の線路に侵入すると、ノイズフィルタの第１のコンデンサ部によって除去される。すなわち、第１巻線側に侵入したノーマルモードノイズは、一方の鍔の表面に形成された第１電極から第２電極を通じて第２巻線側の線路に流出する。
また、コモンモードノイズが、双方の線路に侵入すると、ノイズフィルタのコモンモードチョークコイル部によって除去されると共に、第２及び第３のコンデンサ部によって、確実に除去される。例えば、双方の線路からコモンモードチョークコイル部の第１及び第２巻線に侵入したコモンモードノイズは、コモンモードチョークコイル部のインダクタ機能によって除去されると共に、一方の線路上のコモンモードノイズが第２のコンデンサ部によって除去され、他方の線路上のコモンモードノイズが第３のコンデンサ部によって除去れる。すなわち、一方の線路に侵入したコモンモードノイズは、他方の鍔に形成された第２電極から接地電極を通じて外部に流出し、他方の線路に侵入したコモンモードノイズは、他方の鍔に形成された第３電極から接地電極を通じて外部に流出する。 In order to solve the above-mentioned problems, the invention of claim 1 is directed to a common mode choke coil portion having first and second windings wound around a core of the core, and one end of the first and second windings. A first capacitor portion connected between the first and second windings; and second and third capacitor portions connected in series between the other ends of the first and second windings and capable of being grounded at each other connection site. In the noise filter, a pair of first electrodes facing each other is formed on the surface of one of the ridges, and the pair of first electrodes are connected to one ends of the first and second windings, respectively. Thus, the first capacitor portion is formed, the second electrode and the ground electrode facing each other are formed on the surface of the other flange, and the second electrode is connected to the other end portion of the first winding. The second capacitor portion constitutes the second capacitor portion and faces the ground electrode. An electrode, and forming on the surface of the other flange, the third electrode by connecting to the other end of the second winding, to constitute a third capacitor portion.
With this configuration, both ends of the first winding of the noise filter can be connected to one line of the power supply line, and both ends of the second winding can be connected to the other line. Thus, a pair of power supply voltages are transmitted through the power supply line via the first and second windings.
When normal mode noise enters one line, it is removed by the first capacitor portion of the noise filter. That is, the normal mode noise that has entered the first winding side flows out from the first electrode formed on the surface of one of the saddles to the line on the second winding side through the second electrode.
When common mode noise enters both lines, it is removed by the common mode choke coil portion of the noise filter and reliably removed by the second and third capacitor portions. For example, common mode noise that has entered the first and second windings of the common mode choke coil from both lines is removed by the inductor function of the common mode choke coil, and the common mode noise on one line is reduced. The second capacitor unit removes the common mode noise on the other line by the third capacitor unit. That is, common mode noise that has entered one line flows out from the second electrode formed on the other line through the ground electrode, and common mode noise that has entered the other line is formed on the other line. It flows out from the third electrode through the ground electrode.

請求項２の発明は、請求項１に記載のノイズフィルタにおいて、天板を、巻芯の両端部に設けられた１対の鍔の上端に架け、第２及び第３のコンデンサ部を構成する第２及び第３電極と接地電極とを、天板の表面まで延出させて、これら第２及び第３電極と接地電極とにおける対向辺の長さを稼ぐ構成とした。   According to a second aspect of the present invention, in the noise filter according to the first aspect, the top plate is hung on the upper ends of a pair of scissors provided at both end portions of the core to constitute the second and third capacitor portions. The second and third electrodes and the ground electrode are extended to the surface of the top plate to increase the length of the opposing sides of the second and third electrodes and the ground electrode.

請求項３の発明は、請求項１又は請求項２に記載のノイズフィルタにおいて、第２及び第３電極と接地電極における各対向辺を折曲線状又は曲線状に形成して、対向辺の長さを稼ぐ構成とした。   According to a third aspect of the present invention, in the noise filter according to the first or second aspect, the opposing sides of the second and third electrodes and the ground electrode are formed in a bent shape or a curved shape, and the length of the opposing sides is determined. It was configured to earn money.

請求項４の発明は、コアの巻芯に巻回された第１及び第２巻線を有するコモンモードチョークコイル部と、第１及び第２巻線の一方端部間に接続された第１のコンデンサ部と、第１及び第２巻線の他方端部間に直列に接続され且つ互いの接続部位において接地可能な第２及び第３のコンデンサ部とを具備したノイズフィルタであって、互いに対向する１対の第１電極を、一方の鍔の表面に形成すると共に、１対の第１電極を第１及び第２巻線の一方端部にそれぞれ接続することにより、第１のコンデンサ部を構成し、互いに対向する第２及び第３電極を、別体の誘電体基板の表面に形成すると共に、接地電極を、他方の鍔の表面又は誘電体基板の裏面のいずれかに形成して、誘電体基板をコアに取り付け、第１及び第２巻線の他方端部を、第２及び第３電極にそれぞれ接続することで、第２電極と接地電極とにより、第２のコンデンサ部を構成すると共に、第３電極と接地電極とにより、第３のコンデンサ部を構成する。
かかる構成により、ノイズフィルタを、例えば電源供給線路に接続すると、ノーマルモードノイズが第１のコンデンサ部によって除去され、コモンモードノイズが第２及び第３のコンデンサ部によって除去される。すなわち、一方の線路に侵入したコモンモードノイズは、誘電体基板の表面に形成されている第２電極から他方の鍔の表面又は誘電体基板の裏面のいずれかに形成されている接地電極を通じて、外部に流出する。また、他方の線路に侵入したコモンモードノイズは、誘電体基板の表面に形成されている第３電極から他方の鍔の表面又は誘電体基板の裏面のいずれかに形成されている接地電極を通じて、外部に流出する According to a fourth aspect of the present invention, there is provided a common mode choke coil portion having first and second windings wound around a core core, and a first connected between one end portions of the first and second windings. And a second and a third capacitor part connected in series between the other ends of the first and second windings and capable of being grounded at each other connection site, By forming a pair of opposed first electrodes on the surface of one of the ridges and connecting the pair of first electrodes to one end of each of the first and second windings, the first capacitor unit The second and third electrodes facing each other are formed on the surface of a separate dielectric substrate, and the ground electrode is formed on either the surface of the other ridge or the back surface of the dielectric substrate. The dielectric substrate is attached to the core, and the other ends of the first and second windings are And by connecting each of the third electrode, the second electrode and the ground electrode, thereby constituting a second capacitor portion, by a third electrode ground electrode, constituting a third capacitor portion.
With this configuration, when the noise filter is connected to, for example, a power supply line, normal mode noise is removed by the first capacitor unit, and common mode noise is removed by the second and third capacitor units. That is, the common mode noise that has entered one line passes from the second electrode formed on the surface of the dielectric substrate to the other electrode surface or the ground electrode formed on the back surface of the dielectric substrate. It flows out to the outside. Further, the common mode noise that has entered the other line passes from the third electrode formed on the surface of the dielectric substrate through the ground electrode formed on either the surface of the other ridge or the back surface of the dielectric substrate, Leak outside

請求項５の発明は、請求項４に記載のノイズフィルタにおいて、接地電極を、他方の鍔の表面に形成して、誘電体基板の裏面を鍔の表面に接着した構成とする。   According to a fifth aspect of the present invention, in the noise filter according to the fourth aspect, the ground electrode is formed on the surface of the other ridge, and the back surface of the dielectric substrate is bonded to the surface of the ridge.

請求項６の発明は、請求項４に記載のノイズフィルタにおいて、接地電極を、誘電体基板の裏面に形成して、誘電体基板を、巻芯の両端部に設けられた１対の鍔の下端に架けて取り付けた構成とする。   According to a sixth aspect of the present invention, in the noise filter according to the fourth aspect, the ground electrode is formed on the back surface of the dielectric substrate, and the dielectric substrate is a pair of scissors provided at both ends of the core. It shall be the structure attached to the lower end.

以上詳しく説明したように、請求項１ないし請求項３の発明に係るノイズフィルタによれば、コモンモードチョークコイル部と第１ないし第３のコンデンサ部という少数の部品で構成されているので、その分製品コストの低廉化を図ることができるという優れた効果がある。しかも、コモンモードチョークコイル部を、第１及び第２巻線をコアの巻芯に巻回することで構成し、第１のコンデンサ部を、１対の第１電極をコアの一方の鍔に形成することで構成し、第２及び第３のコンデンサ部を、第２及び第３電極と接地電極とを他方の鍔に形成することで構成したので、ノイズフィルタの構造が、上記した従来のノイズフィルタに比べて極めて単純である。このため、製造上の繁雑な作業や手間を省くことができると共に製品の小型化を図ることができるいう効果もある。さらに、第１ないし第３のコンデンサ部を鍔に形成し、コモンモードチョークコイル部とこれら第１ないし第３のコンデンサ部とを一つの部品に一体化させたので、従来のノイズフィルタのようなコンデンサの取付ミスという事態は生じない。この結果、コンデンサ取付ミスによる除去効果の劣化という事態を完全に防止することができる。   As described above in detail, according to the noise filter of the invention of claims 1 to 3, the noise filter is composed of a small number of parts, that is, the common mode choke coil portion and the first to third capacitor portions. There is an excellent effect that the cost of separated products can be reduced. In addition, the common mode choke coil portion is configured by winding the first and second windings around the core of the core, and the first capacitor portion is formed with a pair of first electrodes on one side of the core. Since the second and third capacitor portions are formed by forming the second and third electrodes and the ground electrode on the other side, the structure of the noise filter is the same as the conventional one described above. It is extremely simple compared to a noise filter. For this reason, there is an effect that it is possible to save complicated manufacturing work and labor and to reduce the size of the product. Further, since the first to third capacitor portions are formed in a bowl, and the common mode choke coil portion and the first to third capacitor portions are integrated into one component, it is similar to a conventional noise filter. There is no situation of incorrect capacitor installation. As a result, it is possible to completely prevent the deterioration of the removal effect due to a capacitor mounting error.

特に、請求項２の発明によれば、第２及び第３のコンデンサ部を構成する第２及び第３電極と接地電極とを、天板の表面まで延出させて、これら第２及び第３電極と接地電極とにおける対向辺の長さを稼ぐ構成であるので、第２及び第３のコンデンサ部の容量を大きくすることができる。この結果、より低周波のコモンモードノイズを効果的に除去することができる。   In particular, according to the second aspect of the present invention, the second and third electrodes constituting the second and third capacitor portions and the ground electrode are extended to the surface of the top plate, and the second and third electrodes are formed. Since it is the structure which earns the length of the opposing side in an electrode and a ground electrode, the capacity | capacitance of a 2nd and 3rd capacitor | condenser part can be enlarged. As a result, lower frequency common mode noise can be effectively removed.

また、請求項３の発明によれば、第２及び第３電極と接地電極における各対向辺を折曲線状又は曲線状に形成して、対向辺の長さを稼ぐ構成であるので、低周波のコモンモードノイズ除去効果を高めることができるだけでなく、大容量の第２及び第３のコンデンサ部を小面積の領域に形成することができるという効果がある。   Further, according to the invention of claim 3, since the opposing sides of the second and third electrodes and the ground electrode are formed in a curved line shape or a curved shape to increase the length of the opposing sides, the low frequency In addition to enhancing the common mode noise removal effect, there is an effect that the large-capacity second and third capacitor portions can be formed in a small area.

請求項４ないし請求項６の発明に係るノイズフィルタによれば、第２及び第３電極と接地電極との間に誘電体基板を介在させることで、第２及び第３のコンデンサ部を構成したので、第２及び第３電極と接地電極との対向辺の長さを大きくすることなく、容量を大きくすることができる。この結果、小型で大容量のコンデンサ部を備えたノイズフィルタを提供することができるという優れた効果がある。   According to the noise filter of the fourth to sixth aspects of the present invention, the second and third capacitor portions are configured by interposing the dielectric substrate between the second and third electrodes and the ground electrode. Therefore, the capacity can be increased without increasing the length of the opposing sides of the second and third electrodes and the ground electrode. As a result, there is an excellent effect that it is possible to provide a small noise filter including a large-capacity capacitor unit.

以下、この発明の最良の形態について図面を参照して説明する。   The best mode of the present invention will be described below with reference to the drawings.

図１は、この発明の第１実施例に係るノイズフィルタを前方より示す斜視図であり、図２は、ノイズフィルタを後方より示す斜視図であり、図３は、ノイズフィルタの側面図であり、図４は、ノイズフィルタの裏面図である。   1 is a perspective view showing a noise filter according to a first embodiment of the present invention from the front, FIG. 2 is a perspective view showing the noise filter from the rear, and FIG. 3 is a side view of the noise filter. FIG. 4 is a rear view of the noise filter.

図１及び図２に示すように、この実施例のノイズフィルタ１は、コモンモードチョークコイル部２と第１のコンデンサ部５と第２及び第３のコンデンサ部６，７とで構成されている。   As shown in FIGS. 1 and 2, the noise filter 1 of this embodiment includes a common mode choke coil portion 2, a first capacitor portion 5, and second and third capacitor portions 6 and 7. .

コモンモードチョークコイル部２は、高周波のコモンモードノイズを除去するための部分であり、第１及び第２巻線４−１，４−２を磁性体のコア３に巻回し、磁性体の天板３５をこのコア３に取り付けて閉磁路構造にしたもので、一般の巻線型コモンモードチョークコイルとほぼ同構造である。
すなわち、図３に示すように、コア３を、巻芯３０とこの巻芯３０の両端部に設けられた１対の鍔３１，３２とで構成した。そして、第１及び第２巻線４−１，４−２を、このコア３の巻芯３０に巻回し、図４に示すように、第１巻線４−１の両端部４−１ａ，４−１ｂを、鍔３１，３２の下面にそれぞれ形成した外部電極５１ａ，６１ａに接続し、第２巻線４−２の両端部４−２ａ，４−２ｂを、鍔３１，３２の下面にそれぞれ形成した外部電極５２ａ，７１ａに接続した。さらに、矩形状の天板３５を鍔３１，３２の上端（図３の上方の端面）に架けて取り付けた。 The common mode choke coil unit 2 is a part for removing high-frequency common mode noise. The first and second windings 4-1 and 4-2 are wound around the magnetic core 3, and the magnetic top A plate 35 is attached to the core 3 to form a closed magnetic circuit structure, which is substantially the same structure as a general winding type common mode choke coil.
That is, as shown in FIG. 3, the core 3 is composed of a core 30 and a pair of flanges 31 and 32 provided at both ends of the core 30. Then, the first and second windings 4-1, 4-2 are wound around the core 30 of the core 3, and as shown in FIG. 4, both end portions 4-1a, 4-1b is connected to external electrodes 51a and 61a formed on the lower surfaces of the flanges 31 and 32, and both end portions 4-2a and 4-2b of the second winding 4-2 are connected to the lower surfaces of the flanges 31 and 32. The external electrodes 52a and 71a were connected respectively. Further, a rectangular top plate 35 was attached to the upper ends (upper end surfaces in FIG. 3) of the eaves 31 and 32.

図１において、第１のコンデンサ部５は、ノーマルモードノイズを除去するための部分であり、一方の鍔３１の表面に形成された１対の第１電極５１，５２で構成されている。
図５は、第１のコンデンサ部５を示すノイズフィルタの前面図である。
図５に示すように、第１のコンデンサ部５は、同形矩形状の第１電極５１，５２を互いに対向させ、一定のギャップＧ１を形成することで構成する。また、第１電極５１，５２の下端を、図４に示した外部電極５１ａ，５２ａにそれぞれ連続させている。この結果、図４に示すように、第１電極５１が、第１巻線４−１の端部４−１ａに接続し、第１電極５２が、第２巻線４−２の端部４−２ａに接続して、第１のコンデンサ部５が第１及び第２巻線４−１，４−２の一方端部４−１ａ，４−２ａ間に接続された状態になる。 In FIG. 1, the first capacitor portion 5 is a portion for removing normal mode noise, and is composed of a pair of first electrodes 51 and 52 formed on the surface of one of the flanges 31.
FIG. 5 is a front view of the noise filter showing the first capacitor unit 5.
As shown in FIG. 5, the 1st capacitor | condenser part 5 is comprised by making the isomorphous rectangular-shaped 1st electrodes 51 and 52 mutually oppose, and forming the fixed gap G1. Further, the lower ends of the first electrodes 51 and 52 are respectively connected to the external electrodes 51a and 52a shown in FIG. As a result, as shown in FIG. 4, the first electrode 51 is connected to the end 4-1a of the first winding 4-1, and the first electrode 52 is connected to the end 4 of the second winding 4-2. -2a, the first capacitor unit 5 is connected between the first ends 4-1a and 4-2a of the first and second windings 4-1 and 4-2.

図２において、第２及び第３のコンデンサ部６，７は、コモンモードノイズを除去するための部分であり、他方の鍔３２の表面に形成された第２及び第３電極６１，７１と接地電極６７とで構成されている。
図６は、第２及び第３のコンデンサ部６，７を示すノイズフィルタの後面図である。
図６に示すように、第２のコンデンサ部６は、同形矩形状の第２電極６１と接地電極６７とを互いに対向させ、一定のギャップＧ２を形成することで構成する。また、第３のコンデンサ部７も、同形矩形状の第３電極７１と接地電極６７とを互いに対向させ、一定のギャップＧ２を形成することで構成する。そして、第２電極６１，接地電極６７，第３電極７１の下端を、図４に示した外部電極６１ａ，６７ａ，７１ａにそれぞれ連続させている。この結果、図４に示すように、第２電極６１が、第１巻線４−１の端部４−１ｂに接続し、第３電極７１が、第２巻線４−２の端部４−２ｂに接続して、第２及び第３のコンデンサ部６，７が、第１及び第２巻線４−１，４−２の他方端部４−１ｂ，４−２ｂ間に直列に接続され且つ接地電極６７を通じて接地可能な状態となる。 In FIG. 2, the second and third capacitor portions 6 and 7 are portions for removing common mode noise, and are connected to the second and third electrodes 61 and 71 formed on the surface of the other flange 32 and the ground. And an electrode 67.
FIG. 6 is a rear view of the noise filter showing the second and third capacitor units 6 and 7.
As shown in FIG. 6, the second capacitor unit 6 is configured by forming a constant gap G <b> 2 by causing a second electrode 61 and a ground electrode 67 having the same rectangular shape to face each other. Further, the third capacitor unit 7 is also configured by forming the fixed gap G2 by making the third electrode 71 and the ground electrode 67 having the same rectangular shape face each other. The lower ends of the second electrode 61, the ground electrode 67, and the third electrode 71 are respectively connected to the external electrodes 61a, 67a, and 71a shown in FIG. As a result, as shown in FIG. 4, the second electrode 61 is connected to the end 4-1b of the first winding 4-1, and the third electrode 71 is connected to the end 4 of the second winding 4-2. -2b, the second and third capacitor parts 6, 7 are connected in series between the other end parts 4-1b, 4-2b of the first and second windings 4-1, 4-2. And can be grounded through the ground electrode 67.

図７は、ノイズフィルタ１の等価回路図である。
ノイズフィルタ１の上記構造を等価回路で示すと、図７に示すような回路になる。
すなわち、コモンモードチョークコイル部２の第１巻線４−１の両端部４−１ａ，４−１ｂが外部電極５１ａ，６１ａに接続され、第２巻線４−２の両端部４−２ａ，４−２ｂが外部電極５２ａ，７１ａに接続されている。そして、第１のコンデンサ部５が第１及び第２巻線４−１，４−２の一方端部４−１ａ，４−２ａに接続され、第２及び第３のコンデンサ部６，７が第１及び第２巻線４−１，４−２の他方端部４−１ｂ，４−２ｂに直列に接続された回路構造になっている。 FIG. 7 is an equivalent circuit diagram of the noise filter 1.
When the above structure of the noise filter 1 is shown by an equivalent circuit, a circuit as shown in FIG. 7 is obtained.
That is, both ends 4-1a and 4-1b of the first winding 4-1 of the common mode choke coil section 2 are connected to the external electrodes 51a and 61a, and both ends 4-2a and 4-2a of the second winding 4-2 are connected. 4-2b is connected to the external electrodes 52a and 71a. The first capacitor unit 5 is connected to one end portions 4-1a and 4-2a of the first and second windings 4-1 and 4-2, and the second and third capacitor units 6 and 7 are connected to each other. The circuit structure is connected in series to the other ends 4-1b, 4-2b of the first and second windings 4-1, 4-2.

次に、この実施例のノイズフィルタ１が示す作用及び効果について説明する。
図８は、ノイズフィルタ１を電源供給線路に実装する例を示す斜視図であり、図９は、ノイズフィルタ１を電源供給線路に実装した場合の等価回路図である。
図８及び図９に示すように、ノイズフィルタ１を電源供給線路１０１，１０２に実装するには、ノイズフィルタ１を、電源供給線路１０１，１０２に設けられている実装用のランド１０１ａ，１０１ｂ、１０２ａ，１０２ｂに半田付等で固定する。
例えば、外部電極５１ａ，５２ａ（図４参照）を電源供給線路１０１，１０２のランド１０１ａ，１０２ａに半田付け固定し、外部電極６１ａ，７１ａを電源供給線路１０１，１０２のランド１０１ｂ，１０２ｂに半田付け固定すると共に、接地用の外部電極６７ａを図示しないシャーシ等にアースされている接地用ランド１０３ｂに半田付け固定する。 Next, operations and effects of the noise filter 1 of this embodiment will be described.
FIG. 8 is a perspective view showing an example in which the noise filter 1 is mounted on the power supply line, and FIG. 9 is an equivalent circuit diagram when the noise filter 1 is mounted on the power supply line.
As shown in FIGS. 8 and 9, in order to mount the noise filter 1 on the power supply lines 101 and 102, the noise filter 1 is mounted on the mounting lands 101 a and 101 b provided on the power supply lines 101 and 102. It fixes to 102a, 102b by soldering etc.
For example, the external electrodes 51a and 52a (see FIG. 4) are soldered and fixed to the lands 101a and 102a of the power supply lines 101 and 102, and the external electrodes 61a and 71a are soldered to the lands 101b and 102b of the power supply lines 101 and 102. At the same time, the grounding external electrode 67a is soldered and fixed to a grounding land 103b grounded to a chassis or the like (not shown).

かかる状態で、電源電流Ｉ+を電源供給線路１０１に流すと、ノイズフィルタ１を通過して所定のＩＣやコネクタ等に電源を供給し、ノイズフィルタ１を通過して電流Ｉ-が戻ってくる。   In this state, when the power supply current I + is passed through the power supply line 101, the power is supplied to a predetermined IC or connector through the noise filter 1, and the current I- returns through the noise filter 1. .

また、ノーマルモードノイズＮ１が、例えば電源供給線路１０１側に侵入すると、このノーマルモードノイズＮ１は、矢印で示すように、第１のコンデンサ部５によって電源供給線路１０２側に除去される。
そして、コモンモードノイズＮ２，Ｎ２が、電源供給線路１０１，１０２に侵入すると、ノイズフィルタ１のコモンモードチョークコイル部２の第１及び第２巻線４−１，４−２のインダクタ機能によって除去されると共に、第２及び第３のコンデンサ部６，７によって、確実に除去される。具体的には、電源供給線路１０１側のコモンモードノイズＮ２は、第２のコンデンサ部６を構成する第２電極６１から接地電極６７を通じて図示しないシャーシ側に流出され、電源供給線路１０２側のコモンモードノイズＮ２は、第３のコンデンサ部７を構成する第３電極７１から接地電極６７を通じてシャーシ側に流出される。 Further, when the normal mode noise N1 enters the power supply line 101, for example, the normal mode noise N1 is removed to the power supply line 102 by the first capacitor unit 5 as indicated by an arrow.
When the common mode noise N2, N2 enters the power supply lines 101, 102, it is removed by the inductor function of the first and second windings 4-1, 4-2 of the common mode choke coil portion 2 of the noise filter 1. At the same time, it is reliably removed by the second and third capacitor portions 6 and 7. Specifically, the common mode noise N2 on the power supply line 101 side flows out from the second electrode 61 constituting the second capacitor unit 6 to the chassis side (not shown) through the ground electrode 67, and is common on the power supply line 102 side. The mode noise N2 flows out from the third electrode 71 constituting the third capacitor unit 7 to the chassis side through the ground electrode 67.

ところで、この実施例のノイズフィルタ１では、第１ないし第３のコンデンサ部５〜７を鍔３１，３２に形成し、コモンモードチョークコイル部２とこれら第１ないし第３のコンデンサ部５〜７とを一つの部品に一体化させているので、従来のノイズフィルタのようなコンデンサの取付ミスという事態は生じない。
ここで、コンデンサ取付ミスによる除去効果の相違について説明する。
図１０は、ノイズレベルと周波数の関係を示す線図であり、図１１は、ノーマルモードノイズ除去用の第１のコンデンサ部５の取付位置を間違えたノイズフィルタの等価回路図である。
図１０において、曲線Ｓ１が、コンデンサ部が適正に取り付けられているこの実施例のノイズフィルタ１が示すノイズレベルと周波数との相関関係である。
曲線Ｓ１で明らかなように、この実施例のノイズフィルタ１では、ノイズレベルが広い周波数範囲に亘って低く抑えることができる。
これに対して、図１１に示すように、第１のコンデンサ部５の取付位置をミスし、コモンモードチョークコイル部２の反対側に取り付けてしまった場合には、曲線Ｓ２で示すように、ノイズレベルが、５０ＭＨｚ周辺の周波数帯域を除いて、全体的に高くなってしまう。
したがって、この実施例のノイズフィルタ１では、このような第１のコンデンサ部５の取り付けミスという事態は生じないので、曲線Ｓ２で示すようなノイズ除去効果の劣化を完全に防止することができる。 By the way, in the noise filter 1 of this embodiment, the first to third capacitor portions 5 to 7 are formed on the flanges 31 and 32, and the common mode choke coil portion 2 and the first to third capacitor portions 5 to 7 are formed. Are integrated into one component, so that there is no problem of a capacitor mounting error like a conventional noise filter.
Here, the difference in the removal effect due to the capacitor mounting mistake will be described.
FIG. 10 is a diagram showing the relationship between noise level and frequency, and FIG. 11 is an equivalent circuit diagram of a noise filter in which the mounting position of the first capacitor unit 5 for removing normal mode noise is wrong.
In FIG. 10, a curve S1 is a correlation between the noise level and the frequency indicated by the noise filter 1 of this embodiment in which the capacitor portion is properly attached.
As is apparent from the curve S1, in the noise filter 1 of this embodiment, the noise level can be kept low over a wide frequency range.
On the other hand, as shown in FIG. 11, when the mounting position of the first capacitor unit 5 is missed and mounted on the opposite side of the common mode choke coil unit 2, as shown by the curve S2, The noise level increases overall except for the frequency band around 50 MHz.
Therefore, in the noise filter 1 of this embodiment, such a situation of the first capacitor portion 5 being attached does not occur, so that it is possible to completely prevent the deterioration of the noise removal effect as shown by the curve S2.

次に、この発明の第２実施例について説明する。
図１２は、この発明の第２実施例に係るノイズフィルタを後方より示す斜視図である。
この実施例は、第２及び第３のコンデンサ部６，７の長さが上記第１実施例と異なる。
すなわち、図１２に示すように、第２及び第３のコンデンサ部６，７を構成する第２及び第３電極６１，７１と接地電極６７とを、長さ方向に延出させる。具体的には、第２及び第３電極６１，７１と接地電極６７とを、天板３５の表面一杯まで延出させる。
これにより、第２電極６１と接地電極６７との対向辺６１ｂ，６７ｂの長さや、接地電極６７と第３電極７１との対向辺６７ｃ，７１ｂの長さを、上記第１実施例のものよりも大きく設定して、第２のコンデンサ部６と第３のコンデンサ部７との容量を稼ぐことができる。 Next explained is the second embodiment of the invention.
FIG. 12 is a perspective view showing the noise filter according to the second embodiment of the present invention from the rear.
In this embodiment, the lengths of the second and third capacitor portions 6 and 7 are different from those of the first embodiment.
That is, as shown in FIG. 12, the second and third electrodes 61 and 71 and the ground electrode 67 constituting the second and third capacitor portions 6 and 7 are extended in the length direction. Specifically, the second and third electrodes 61 and 71 and the ground electrode 67 are extended to the full surface of the top plate 35.
As a result, the length of the opposing sides 61b and 67b between the second electrode 61 and the ground electrode 67 and the length of the opposing sides 67c and 71b between the ground electrode 67 and the third electrode 71 are the same as those in the first embodiment. Can be set to a large value to increase the capacity of the second capacitor unit 6 and the third capacitor unit 7.

第２及び第３のコンデンサ部６，７の容量を大きくすることで、高周波のコモンモードノイズＮ２，Ｎ２だけでなく、低周波のコモンモードノイズをも効果的に除去することができる。
その他の構成、作用及び効果は、上記第１実施例と同様であるので、その記載は省略する。 By increasing the capacitance of the second and third capacitor units 6 and 7, not only the high-frequency common mode noise N2 and N2, but also the low-frequency common mode noise can be effectively removed.
Since other configurations, operations, and effects are the same as those in the first embodiment, description thereof is omitted.

次に、この発明の第３実施例について説明する。
図１３は、この発明の第３実施例に係るノイズフィルタを後方より示す斜視図である。
この実施例は、第２及び第３のコンデンサ部６，７の形状が上記第１及び第２実施例と異なる。
すなわち、図１３に示すように、第２及び第３のコンデンサ部６，７を構成する第２電極６１と接地電極６７との対向辺６１ｂ，６７ｂや、接地電極６７と第３電極７１との対向辺６７ｃ，７１ｂを折曲線状に設定した。具体的には、接地電極６７を十字状に形成すると共に、第２及び第３電極６１，７１の形状を接地電極６７の形状に合致した形状に設定した。
これにより、第２電極６１と接地電極６７との対向辺６１ｂ，６７ｂの長さや、接地電極６７と第３電極７１との対向辺６７ｃ，７１ｂの長さを、大きく設定して、第２のコンデンサ部６と第３のコンデンサ部７との容量を稼ぐことができるだけでなく、かかる大容量の第２及び第３のコンデンサ部６，７を小面積の鍔３２表面に形成することができる。
その他の構成、作用及び効果は、上記第１及び第２実施例と同様であるので、その記載は省略する。 Next explained is the third embodiment of the invention.
FIG. 13 is a perspective view showing the noise filter according to the third embodiment of the present invention from the rear side.
In this embodiment, the shapes of the second and third capacitor portions 6 and 7 are different from those of the first and second embodiments.
That is, as shown in FIG. 13, the opposing sides 61b and 67b between the second electrode 61 and the ground electrode 67 constituting the second and third capacitor portions 6 and 7, and the ground electrode 67 and the third electrode 71 The opposing sides 67c and 71b were set to be bent. Specifically, the ground electrode 67 was formed in a cross shape, and the shapes of the second and third electrodes 61 and 71 were set to match the shape of the ground electrode 67.
Thereby, the length of the opposing sides 61b and 67b between the second electrode 61 and the ground electrode 67 and the length of the opposing sides 67c and 71b between the ground electrode 67 and the third electrode 71 are set to be large, Not only can the capacities of the capacitor unit 6 and the third capacitor unit 7 be gained, but the large-capacity second and third capacitor units 6 and 7 can be formed on the surface of the small-sized ridge 32.
Other configurations, operations, and effects are the same as those in the first and second embodiments, and thus description thereof is omitted.

次に、この発明の第４実施例について説明する。
図１４は、この発明の第４実施例に係るノイズフィルタを後方より示す分解斜視図であり、図１５は、この実施例の要部を示す分解斜視図である。
この実施例は、第２及び第３のコンデンサ部６，７の構造が上記第１ないし第３実施例と異なる。
すなわち、図１４及び図１５に示すように、接地電極６７だけをコア３の鍔３２の表面に形成し、第２電極６１と第３電極７１は、別体の誘電体基板８の表面に形成した。
具体的には、互いに対向する第２及び第３電極６１，７１を、誘電体基板８の表面の両側一杯に形成し、接地電極６７を、鍔３２の表面のほぼ全体に形成して、この誘電体基板８の裏面を鍔３２の表面に接着した。
そして、図１４に示すように、第１及び第２巻線４−１，４−２の両端部４−１ｂ，４−２ｂを、誘電体基板８表面の第２及び第３電極６１，７１にそれぞれ接続した。
これにより、第２のコンデンサ部６が、誘電体基板８を挟んだ第２電極６１と接地電極６７とで構成され、第３のコンデンサ部７が、誘電体基板８を挟んだ第３電極７１と接地電極６７とで構成される。 Next explained is the fourth embodiment of the invention.
FIG. 14 is an exploded perspective view showing the noise filter according to the fourth embodiment of the present invention from the rear, and FIG. 15 is an exploded perspective view showing the main part of this embodiment.
In this embodiment, the structures of the second and third capacitor portions 6 and 7 are different from those of the first to third embodiments.
That is, as shown in FIGS. 14 and 15, only the ground electrode 67 is formed on the surface of the flange 32 of the core 3, and the second electrode 61 and the third electrode 71 are formed on the surface of the separate dielectric substrate 8. did.
Specifically, the second and third electrodes 61 and 71 facing each other are formed on both sides of the surface of the dielectric substrate 8, and the ground electrode 67 is formed on almost the entire surface of the flange 32. The back surface of the dielectric substrate 8 was bonded to the surface of the ridge 32.
Then, as shown in FIG. 14, both end portions 4-1b and 4-2b of the first and second windings 4-1 and 4-2 are connected to the second and third electrodes 61 and 71 on the surface of the dielectric substrate 8, respectively. Connected to each.
As a result, the second capacitor unit 6 includes the second electrode 61 and the ground electrode 67 sandwiching the dielectric substrate 8, and the third capacitor unit 7 includes the third electrode 71 sandwiching the dielectric substrate 8. And a ground electrode 67.

かかる構成により、第２及び第３電極６１，７１や接地電極６７との対向辺の長さを大きくすることなく、容量を大きくすることができるので、小型で大容量の第２及び第３のコンデンサ部６，７を備えたノイズフィルタ１を提供することができる。
その他の構成、作用及び効果は、上記第１ないし第３実施例と同様であるので、その記載は省略する。 With this configuration, the capacity can be increased without increasing the length of the opposing sides of the second and third electrodes 61 and 71 and the ground electrode 67, so that the second and third small and large capacities can be achieved. The noise filter 1 including the capacitor units 6 and 7 can be provided.
Since other configurations, operations, and effects are the same as those in the first to third embodiments, description thereof is omitted.

次に、この発明の第５実施例について説明する。
図１６は、この発明の第５実施例に係るノイズフィルタを後方より示す斜視図であり、図１７は、この実施例の要部である誘電体基板８′の表側を示す斜視図であり、図１８は、誘電体基板８′の裏側を示す斜視図である。
この実施例は、第２及び第３のコンデンサ部６，７の構成を全て誘電体基板８′に組み込んだ点が上記第４実施例と異なる。
すなわち、図１６に示すように、第２及び第３のコンデンサ部６，７の構成を備えた誘電体基板８′を、巻芯３０両端の１対の鍔３１，３２の下端に架けて取り付けた。
具体的には、図１７に示すように、コ字状の第２及び第３電極６１，７１を、中心軸Ｌに線対称の状態で、誘電体基板８′の表面に形成した。また、図１８に示すように、外部電極６１ａ，７１ａが、第２及び第３電極６１，７１とそれぞれ連続するように、誘電体基板８′の裏面隅部に形成され、図１７に示すように、第１電極５１，５２に接続される外部電極５１ａ，５２ａが誘電体基板８′の隅部にそれぞれ形成されている。そして、図１８に示すように、矩形状の接地電極６７が、この誘電体基板８′の裏面の大半部に形成されている。 Next explained is the fifth embodiment of the invention.
FIG. 16 is a perspective view showing a noise filter according to a fifth embodiment of the present invention from the rear side, and FIG. 17 is a perspective view showing a front side of a dielectric substrate 8 ′ which is a main part of this embodiment. FIG. 18 is a perspective view showing the back side of the dielectric substrate 8 ′.
This embodiment is different from the fourth embodiment in that the configurations of the second and third capacitor portions 6 and 7 are all incorporated in the dielectric substrate 8 '.
That is, as shown in FIG. 16, the dielectric substrate 8 ′ having the configuration of the second and third capacitor parts 6 and 7 is attached to the lower ends of the pair of flanges 31 and 32 at both ends of the core 30. It was.
Specifically, as shown in FIG. 17, U-shaped second and third electrodes 61 and 71 are formed on the surface of the dielectric substrate 8 ′ in a state of line symmetry with respect to the central axis L. Further, as shown in FIG. 18, external electrodes 61a and 71a are formed at the back corners of the dielectric substrate 8 'so as to be continuous with the second and third electrodes 61 and 71, respectively, as shown in FIG. In addition, external electrodes 51a and 52a connected to the first electrodes 51 and 52 are formed at the corners of the dielectric substrate 8 ', respectively. Then, as shown in FIG. 18, a rectangular ground electrode 67 is formed on most of the back surface of the dielectric substrate 8 '.

これにより、第２のコンデンサ部６が、誘電体基板８′を挟んだ第２電極６１と接地電極６７とで構成され、第３のコンデンサ部７が、誘電体基板８′を挟んだ第３電極７１と接地電極６７とで構成される。そして、外部電極５１ａ，５２ａ及び外部電極６１ａ，７１ａが誘電体基板８′の裏面四隅に配設されることとなる。
その他の構成、作用及び効果は、上記第４実施例と同様であるので、その記載は省略する。 As a result, the second capacitor portion 6 is constituted by the second electrode 61 and the ground electrode 67 sandwiching the dielectric substrate 8 ', and the third capacitor portion 7 is the third electrode sandwiching the dielectric substrate 8'. An electrode 71 and a ground electrode 67 are included. Then, the external electrodes 51a and 52a and the external electrodes 61a and 71a are disposed at the four corners on the back surface of the dielectric substrate 8 ′.
Other configurations, operations, and effects are the same as those in the fourth embodiment, and thus description thereof is omitted.

なお、この発明は、上記実施例に限定されるものではなく、発明の要旨の範囲内において種々の変形や変更が可能である。
例えば、上記第１，第３〜第５実施例では、天板３５を有したノイズフィルタを例示したが、上記第１，第３〜第５実施例に対応する構成であって、天板３５だけを除いたノイズフィルタもこの発明の範囲に含まれることは勿論である。 In addition, this invention is not limited to the said Example, A various deformation | transformation and change are possible within the range of the summary of invention.
For example, in the first, third, and fifth embodiments, the noise filter having the top plate 35 is illustrated. However, the configuration corresponds to the first, third, and fifth embodiments, and the top plate 35 is configured. Needless to say, a noise filter other than the above is also included in the scope of the present invention.

この発明の第１実施例に係るノイズフィルタを前方より示す斜視図である。It is a perspective view which shows the noise filter which concerns on 1st Example of this invention from the front. ノイズフィルタを後方より示す斜視図である。It is a perspective view which shows a noise filter from back. ノイズフィルタの側面図である。It is a side view of a noise filter. ノイズフィルタの裏面図である。It is a reverse view of a noise filter. 第１のコンデンサ部を示すノイズフィルタの前面図である。It is a front view of the noise filter which shows a 1st capacitor | condenser part. 第２及び第３のコンデンサ部を示すノイズフィルタの後面図である。It is a rear view of the noise filter which shows the 2nd and 3rd capacitor | condenser part. ノイズフィルタの等価回路図である。It is an equivalent circuit diagram of a noise filter. ノイズフィルタを電源供給線路に実装する例を示す斜視図である。It is a perspective view which shows the example which mounts a noise filter in a power supply line. ノイズフィルタを電源供給線路に実装した場合の等価回路図である。It is an equivalent circuit diagram at the time of mounting a noise filter on a power supply line. ノイズレベルと周波数の関係を示す線図である。It is a diagram which shows the relationship between a noise level and a frequency. ノーマルモードノイズ除去用の第１のコンデンサ部の取付位置を間違えたノイズフィルタの等価回路図である。FIG. 6 is an equivalent circuit diagram of a noise filter in which the mounting position of the first capacitor part for removing normal mode noise is wrong. この発明の第２実施例に係るノイズフィルタを後方より示す斜視図である。It is a perspective view which shows the noise filter which concerns on 2nd Example of this invention from back. この発明の第３実施例に係るノイズフィルタを後方より示す斜視図である。It is a perspective view which shows the noise filter which concerns on 3rd Example of this invention from back. この発明の第４実施例に係るノイズフィルタを後方より示す分解斜視図である。It is a disassembled perspective view which shows the noise filter which concerns on 4th Example of this invention from back. この実施例の要部を示す分解斜視図である。It is a disassembled perspective view which shows the principal part of this Example. この発明の第５実施例に係るノイズフィルタを後方より示す斜視図である。It is a perspective view which shows the noise filter which concerns on 5th Example of this invention from back. 第５実施例の要部である誘電体基板の表側を示す斜視図である。It is a perspective view which shows the front side of the dielectric substrate which is the principal part of 5th Example. 誘電体基板の裏側を示す斜視図である。It is a perspective view which shows the back side of a dielectric substrate.

符号の説明Explanation of symbols

１…ノイズフィルタ、 ２…コモンモードチョークコイル部、 ３…コア、 ４−１…第１巻線、 ４−２…第２巻線、 ５…第１のコンデンサ部、 ６…第２のコンデンサ部、 ７…第３のコンデンサ部、 ８，８′…誘電体基板、 ３０…巻芯、 ３１，３２…鍔、 ３５…天板、 ５１，５２…第１電極、 ５１ａ，５２ａ，６１ａ，６７ａ，７１ａ…外部電極、 ６１…第２電極、 ６１ｂ，６７ｂ，６７ｃ，７１ｂ…対向辺、 ６７…接地電極、 ７１…第３電極。   DESCRIPTION OF SYMBOLS 1 ... Noise filter, 2 ... Common mode choke coil part, 3 ... Core, 4-1 ... 1st winding, 4-2 ... 2nd winding, 5 ... 1st capacitor | condenser part, 6 ... 2nd capacitor | condenser part 7 ... third capacitor section 8, 8 '... dielectric substrate, 30 ... core, 31, 32 ... bowl, 35 ... top plate, 51, 52 ... first electrode, 51a, 52a, 61a, 67a, 71a ... external electrode, 61 ... second electrode, 61b, 67b, 67c, 71b ... opposite side, 67 ... ground electrode, 71 ... third electrode.

Claims (6)

コアの巻芯に巻回された第１及び第２巻線を有するコモンモードチョークコイル部と、上記第１及び第２巻線の一方端部間に接続された第１のコンデンサ部と、当該第１及び第２巻線の他方端部間に直列に接続され且つ互いの接続部位において接地可能な第２及び第３のコンデンサ部とを具備したノイズフィルタであって、
互いに対向する１対の第１電極を、一方の鍔の表面に形成すると共に、当該１対の第１電極を上記第１及び第２巻線の一方端部にそれぞれ接続することにより、上記第１のコンデンサ部を構成し、
互いに対向する第２電極及び接地電極を、他方の鍔の表面に形成すると共に、当該第２電極を、上記第１巻線の他方端部に接続することにより、上記第２のコンデンサ部を構成し、
上記接地電極と互いに対向する第３電極を、上記他方の鍔の表面に形成すると共に、当該第３電極を、上記第２巻線の他方端部に接続することにより、上記第３のコンデンサ部を構成した、
ことを特徴とするノイズフィルタ。 A common mode choke coil portion having first and second windings wound around a core of the core; a first capacitor portion connected between one end portions of the first and second windings; A noise filter including a second and a third capacitor portion connected in series between the other ends of the first and second windings and capable of being grounded at a connection portion thereof;
A pair of first electrodes facing each other is formed on the surface of one of the ridges, and the pair of first electrodes is connected to one end of each of the first and second windings, thereby 1 capacitor part,
The second capacitor portion is formed by forming a second electrode and a ground electrode facing each other on the surface of the other flange, and connecting the second electrode to the other end portion of the first winding. And
A third electrode opposite to the ground electrode is formed on the surface of the other flange, and the third electrode is connected to the other end of the second winding, whereby the third capacitor portion Configured
A noise filter characterized by that. 請求項１に記載のノイズフィルタにおいて、
天板を、上記巻芯の両端部に設けられた１対の上記鍔の上端に架け、
上記第２及び第３のコンデンサ部を構成する第２及び第３電極と接地電極とを、上記天板の表面まで延出させて、これら第２及び第３電極と接地電極とにおける対向辺の長さを稼ぐ、
ことを特徴とするノイズフィルタ。 The noise filter according to claim 1,
A top plate is hung on the upper ends of a pair of hooks provided at both ends of the core,
The second and third electrodes constituting the second and third capacitor portions and the ground electrode are extended to the surface of the top plate, and the opposing sides of the second and third electrodes and the ground electrode are extended. Earn length,
A noise filter characterized by that. 請求項１又は請求項２に記載のノイズフィルタにおいて、
上記第２及び第３電極と接地電極における各対向辺を折曲線状又は曲線状に形成して、対向辺の長さを稼ぐ、
ことを特徴とするノイズフィルタ。 The noise filter according to claim 1 or 2,
Forming the opposing sides of the second and third electrodes and the ground electrode in a folded or curved shape to increase the length of the opposing sides;
A noise filter characterized by that. コアの巻芯に巻回された第１及び第２巻線を有するコモンモードチョークコイル部と、上記第１及び第２巻線の一方端部間に接続された第１のコンデンサ部と、当該第１及び第２巻線の他方端部間に直列に接続され且つ互いの接続部位において接地可能な第２及び第３のコンデンサ部とを具備したノイズフィルタであって、
互いに対向する１対の第１電極を、一方の鍔の表面に形成すると共に、当該１対の第１電極を上記第１及び第２巻線の一方端部にそれぞれ接続することにより、上記第１のコンデンサ部を構成し、
互いに対向する第２及び第３電極を、別体の誘電体基板の表面に形成すると共に、接地電極を、他方の鍔の表面又は当該誘電体基板の裏面のいずれかに形成して、当該誘電体基板を上記コアに取り付け、上記第１及び第２巻線の他方端部を、当該第２及び第３電極にそれぞれ接続することで、上記第２電極と接地電極とにより、上記第２のコンデンサ部を構成すると共に、上記第３電極と接地電極とにより、上記第３のコンデンサ部を構成する、
ことを特徴とするノイズフィルタ。 A common mode choke coil portion having first and second windings wound around a core of the core; a first capacitor portion connected between one end portions of the first and second windings; A noise filter including a second and a third capacitor portion connected in series between the other ends of the first and second windings and capable of being grounded at a connection portion thereof;
A pair of first electrodes facing each other is formed on the surface of one of the ridges, and the pair of first electrodes is connected to one end of each of the first and second windings, thereby 1 capacitor part,
The second and third electrodes facing each other are formed on the surface of a separate dielectric substrate, and the ground electrode is formed on either the surface of the other ridge or the back surface of the dielectric substrate. A body substrate is attached to the core, and the other ends of the first and second windings are connected to the second and third electrodes, respectively. The capacitor part is configured, and the third capacitor part is configured by the third electrode and the ground electrode.
A noise filter characterized by that. 請求項４に記載のノイズフィルタにおいて、
上記接地電極を、上記他方の鍔の表面に形成して、上記誘電体基板の裏面を当該鍔の表面に接着した、
ことを特徴とするノイズフィルタ。 The noise filter according to claim 4,
The ground electrode is formed on the surface of the other ridge, and the back surface of the dielectric substrate is bonded to the surface of the ridge.
A noise filter characterized by that. 請求項４に記載のノイズフィルタにおいて、
上記接地電極を、上記誘電体基板の裏面に形成して、当該誘電体基板を、上記巻芯の両端部に設けられた１対の上記鍔の下端に架けて取り付けた、
ことを特徴とするノイズフィルタ。 The noise filter according to claim 4,
The ground electrode is formed on the back surface of the dielectric substrate, and the dielectric substrate is attached over the lower ends of the pair of hooks provided at both ends of the core.
A noise filter characterized by that.
JP2005335595A 2005-11-21 2005-11-21 Noise filter Pending JP2007142931A (en)

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008139756A1 (en) * 2007-05-14 2008-11-20 Murata Manufacturing Co., Ltd. Common-mode choke coil
WO2009008213A1 (en) * 2007-07-11 2009-01-15 Murata Manufacturing Co., Ltd. Common mode choke coil
JPWO2008065824A1 (en) * 2006-12-01 2010-03-04 株式会社村田製作所 Common mode choke coil
JP2012256669A (en) * 2011-06-08 2012-12-27 Tdk Corp Coil component
JP2013191671A (en) * 2012-03-13 2013-09-26 Murata Mfg Co Ltd Composite filter component
US10079585B2 (en) 2014-09-29 2018-09-18 Murata Manufacturing Co., Ltd. LC filter
US10867736B2 (en) * 2017-03-31 2020-12-15 Taiyo Yuden Co., Ltd. Common mode choke coil, method for manufacturing the same, and circuit board
US11670442B2 (en) 2018-09-28 2023-06-06 Taiyo Yuden Co., Ltd. Coil component and electronic device

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPWO2008065824A1 (en) * 2006-12-01 2010-03-04 株式会社村田製作所 Common mode choke coil
US7855627B2 (en) 2007-05-14 2010-12-21 Murata Manufacturing Co., Ltd. Common-mode choke coil
JP4835751B2 (en) * 2007-05-14 2011-12-14 株式会社村田製作所 Common mode choke coil
WO2008139756A1 (en) * 2007-05-14 2008-11-20 Murata Manufacturing Co., Ltd. Common-mode choke coil
EP2172950A1 (en) * 2007-07-11 2010-04-07 Murata Manufacturing Co. Ltd. Common mode choke coil
US8044753B2 (en) 2007-07-11 2011-10-25 Murata Manufacturing Co., Ltd. Common-mode choke coil
WO2009008213A1 (en) * 2007-07-11 2009-01-15 Murata Manufacturing Co., Ltd. Common mode choke coil
JP4835752B2 (en) * 2007-07-11 2011-12-14 株式会社村田製作所 Common mode choke coil
EP2172950A4 (en) * 2007-07-11 2013-01-23 Murata Manufacturing Co Common mode choke coil
JP2012256669A (en) * 2011-06-08 2012-12-27 Tdk Corp Coil component
JP2013191671A (en) * 2012-03-13 2013-09-26 Murata Mfg Co Ltd Composite filter component
US10079585B2 (en) 2014-09-29 2018-09-18 Murata Manufacturing Co., Ltd. LC filter
US10867736B2 (en) * 2017-03-31 2020-12-15 Taiyo Yuden Co., Ltd. Common mode choke coil, method for manufacturing the same, and circuit board
US11640869B2 (en) 2017-03-31 2023-05-02 Taiyo Yuden Co., Ltd. Bonding structure of a sheet core and a pair of flange parts of a coil component
US11670442B2 (en) 2018-09-28 2023-06-06 Taiyo Yuden Co., Ltd. Coil component and electronic device

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