JP2004311866A - Choke coil - Google Patents

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Publication number
JP2004311866A
JP2004311866A JP2003106302A JP2003106302A JP2004311866A JP 2004311866 A JP2004311866 A JP 2004311866A JP 2003106302 A JP2003106302 A JP 2003106302A JP 2003106302 A JP2003106302 A JP 2003106302A JP 2004311866 A JP2004311866 A JP 2004311866A
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magnetic core
choke coil
winding wire
coil
covered
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Inventor
Namio Sato
濤雄 佐藤
Hidetoshi Ito
英逸 伊藤
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SEKISHIN KOGYO KK
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SEKISHIN KOGYO KK
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Priority to JP2003106302A priority Critical patent/JP2004311866A/en
Priority to KR1020030038181A priority patent/KR20040088983A/en
Priority to CNA031487033A priority patent/CN1536764A/en
Publication of JP2004311866A publication Critical patent/JP2004311866A/en
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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F17/00Fixed inductances of the signal type 
    • H01F17/04Fixed inductances of the signal type  with magnetic core
    • H01F17/06Fixed inductances of the signal type  with magnetic core with core substantially closed in itself, e.g. toroid
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/12Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
    • H01F1/14Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
    • H01F1/147Alloys characterised by their composition
    • H01F1/153Amorphous metallic alloys, e.g. glassy metals
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/12Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
    • H01F1/34Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials non-metallic substances, e.g. ferrites
    • H01F1/342Oxides
    • H01F1/344Ferrites, e.g. having a cubic spinel structure (X2+O)(Y23+O3), e.g. magnetite Fe3O4
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01FMAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F5/00Coils
    • H01F5/04Arrangements of electric connections to coils, e.g. leads
    • HELECTRICITY
    • H03ELECTRONIC CIRCUITRY
    • H03HIMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/01Frequency selective two-port networks
    • H03H7/09Filters comprising mutual inductance

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Coils Or Transformers For Communication (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a choke coil which has a structure wherein the coil itself can bypass a high frequency signal to a grounded side. <P>SOLUTION: The choke coil has a magnetic core 2 of a magnetic material having a low intrinsic resistance and a grounding terminal provided with a grounding lead connected to the magnetic core 2 in a direct conducted state. The magnetic core 2 is covered with a case or an insulating paint, on which a winding wire 1 is wound. Utilizing the distributed capacity of an insulating material 3 and a space between the winding wire 1 and the magnetic core 2, the choke coil can have a function of causing a high frequency component to flow into the ground and its product can have a radiation effect function. The grounding lead is set in the main body of the coke coil. The winding wire 1 is covered with a paste-like conductive material 4 such as paste carbon so as to have the same potential as the grounding lead. As a result, the distributed capacity can be adjusted and increased. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【0001】
【発明の属する技術分野】
本発明は、コイル自体に高周波信号をアース側にバイパスできるような構造を持ったチョークコイルに関する。
【0002】
【従来の技術】
チョークコイルは、直流をより通し、周波数の高い交流電流の通過を妨げるため、抵抗値は小さくインダクタンスを大きくしたコイルである。
従来、チョークコイルは、少なからず浮遊静電容量が存在し、この浮遊静電容量はチョークコイルをバイパスするため、チョークコイルのインダクタンスによる高周波特性(ノイズ低減効果)を阻害するように作用し、結果としてノイズフィルタの減衰特性を悪化させるものであった。
しかしながら、ノイズフィルタの減衰特性を悪化させる要因となるチョークコイルの巻線に起因する浮遊静電容量を逆にバイパスコンデンサとして利用することにより、フィルタの減衰特性を向上させる公知技術として、特開平11−346472号公報がある。
【0003】
【特許文献】
前記特開平11−346472号公報は、図8に示すように、プリント配線基板A及びコモンモードチョークコイルL1、L2からなるノイズフィルタにおいて、少なくとも1個のコモンモードチョークコイルを導電体Cで覆ったものであり、フィルタの減衰特性を悪化させる浮遊静電容量が無くなり、且つその浮遊静電容量がラインバイパスコンデンサとして作用して分布定数型フィルタを形成することで、フィルタの減衰特性は飛躍的に向上するものである。
【0004】
【発明が解決しようとする課題】
さらに、本発明は、コイル自体に高周波信号をアース側にバイパスできるような構造を持ったチョークコイルを提供することを目的とする。
【0005】
【課題を解決するための手段】
本発明のチョークコイルは、磁性材料の固有抵抗が低い磁心と、該磁心と直接導電状態に接続したアース用リードを形成したアース端子を持ち、前記磁心をケース又は絶縁塗料で覆い、その上に巻線ワイヤーが施されたものである。
また、前記磁心の固有抵抗が50−Ωm以下であるものである。
さらに、前記磁性材料がソフトフェライトではMn−Zn系、金属系ではセンダスト、アモルファス及びそれら類似の金属成形材料、圧粉材料では鉄系、鉄合金系、その他金属粉末系の導電性を有する材料からなるものである。
本発明のチョークコイルは、アース用リードがチョークコイル本体にセットされており、前記アース用リードと同電位になるように巻線ワイヤーをペースト状の導電材料で被覆するものである。
【0006】
【発明の実施の形態】
本発明のチョークコイルは、図1に示すように、磁性材料の固有抵抗が低い磁心2と、該磁心2と直接導電状態に接続したアース用リードを形成したアース端子を持ち、前記磁心2をケース又は絶縁塗料で覆い、その上に巻線ワイヤー1が施されたものであり、巻線ワイヤー(マグネットワイヤー)1と磁心2間の絶縁材料3及び空間による分布容量を利用し、高周波成分をアースへ流れる機能及び製品自体の放熱効果機能を持たせたものである。
更に、図2に示すように、アース用リードがチョークコイル本体にセットされており、前記アース用リードと同電位になるように巻線ワイヤー(マグネットワイヤー)1をペーストカーボン等のペースト状の導電材料4で被覆して利用するものであり、分布容量を調整及び増加させるものである。
すなわち、本発明のチョークコイルは、図2に示すように、コイル全周に渡って対向電極となっているため、対向電極面積が多く、しかも電極間ギャップが狭く、容量値の範囲を数PF〜数千PFまで変えて設計ができ、かつ設計自由度が大きい。
【0007】
【実施例】
以下、本発明のチョークコイルの実施例を図面に基づいて説明するが、これに限定されるものではない。
(1)トロイダル型タイプ
図3に示すように、磁性材料の固有抵抗が50−Ωm以下の材料、例えばソフトフェライトではMn−Zn系、金属系ではセンダスト、アモルファス及びそれら類似の金属成形材料、圧粉材料では鉄系、鉄合金系、その他金属粉末系の導電性を有する材料の円環状の磁心2と、その磁心2と直接導電性の接着剤等で導電状態に接着したアース用リード6を形成したアース端子を持ち、前記磁心2を絶縁塗料3で覆い、その上に巻線ワイヤー(マグネットワイヤー)1が施されたものである。
前記巻線ワイヤー(マグネットワイヤー)1は、外径端にコイル端末5を備え、比抵抗が小さい円環状の磁心2に螺旋状に巻回され、外径端にコイル端末5を備える。
前記磁心2にアース用リード6を導電接着することにより、前記磁心自体が本来の磁性体の機能と同時に巻線されたコイル導体との間に分布容量が発生し、そのために高周波信号部分をアースにバイパスすることが可能となり、チョークコイルの高周波特性が一段と改善される。
又、図4に示すように、内面に導電材料4を塗布したコアカバー7で前記磁心2を覆い、その上に巻線ワイヤー(マグネットワイヤー)1が施され、コアカバー7の裏面にアース用リード6を導電接着することにより、コイルとの電極間の寸法が小さくなり、より大きな分布容量を発生することができ、それにより比抵抗の高い磁心にも同様な効果的な改善特性を得ることが出来るようになる。
【0008】
次に、本発明のチョークコイルと従来型チョークコイルとの特性を比較したものを表1〜4に示す。
従来型チョークコイルは、Mn−Zn系フェライトのトロイダル型の磁心をプラスチックのケースカバーで覆い、その上に巻線ワイヤー(マグネットワイヤー)で巻線したものであり、本発明のチョークコイルは、図4に示すように、ケースカバー7内部にある磁心2にアース用リード6線を導電接着し、その端末を引き出す構造にしたものである。
従来型チョークコイルと本発明のアースを取り付けたチョークコイルとの総合特性の比較(表1)
【表1】

Figure 2004311866
高周波領域で大幅な特性改善が見られる。
【0009】
チョークコイルのインダクタンス特性(表2)
【表2】
Figure 2004311866
双方同条件なので同特性である。
【0010】
本発明の巻線ワイヤー(マグネットワイヤー)と磁心間で発生している分布容量の状態(表3)
【表3】
Figure 2004311866
【0011】
本発明の発生している分布容量及びコイルインピーダンス特性(表4)
【表4】
Figure 2004311866
分布容量によるインピーダンス特性が高周波で低く作用し、高周波での特性が改善されることが判る。
【0012】
(2)低電圧・信号系リードタイプチョークコイル(磁心比抵抗が低い)の場合図5に示すように、巻線ワイヤー(マグネットワイヤー)1は、一方端にコイル端末5を備え、比抵抗が小さい円柱体の磁心2に螺旋状に巻回され、他方端にコイル端末5を備える。
また、前記磁心2の他方端側にはアース端末6が導電接着により接続されることにより、前記磁心自体が本来の磁性体の機能と同時に巻線されたコイル導体との間に分布容量が発生し、そのために高周波信号部分をアースにバイパスすることが可能となり、チョークコイルの高周波特性が一段と改善される。
更に、前記巻線ワイヤー(マグネットワイヤー)1が巻回された前記磁心2の中央部には、ペーストカーボン等のペースト状の導電材料4で前記巻線ワイヤー(マグネットワイヤー)1を被覆して導電部を形成することにより、前記巻線ワイヤー(マグネットワイヤー)1と前記導電材料4との間で分布容量の大きな値にすることができ特性改善がなされる。
【0013】
(3)低電圧・信号系リードタイプチョークコイル(磁心比抵抗が高い)の場合図6に示すように、巻線ワイヤー(マグネットワイヤー)1は、一方端にコイル端末5を備え、比抵抗が大きい円柱体の磁心2に螺旋状に巻回され、他方端にコイル端末5を備える。
また、前記磁心2の中央部には前記巻線ワイヤー(マグネットワイヤー)1を覆うようにアース端末6が接続される。
そして、前記アース端末6が巻回された前記磁心2の中央部には、ペーストカーボン等のペースト状の導電材料4で前記巻線ワイヤー(マグネットワイヤー)1及び前記アース端末6を被覆して導電部を形成する。
したがって、前記巻線ワイヤー(マグネットワイヤー)1と前記導電材料4との間で分布容量を取ることが出来る。
【0014】
(4)面搭載型チョーク(トロイダル)の場合
図7に示すように、巻線ワイヤー(マグネットワイヤー)1は、内径端にコイル端末5を備え、比抵抗が小さい円環状の磁心2に螺旋状に巻回され、外径端にコイル端末5を備える。
そして、前記巻線ワイヤー(マグネットワイヤー)1が巻回された前記磁心2の所定範囲には、ペーストカーボン等のペースト状の導電材料4で前記巻線ワイヤー(マグネットワイヤー)1を被覆して導電部を形成する。
また、アース端末6が前記導電材料4を被覆していない前記磁心2の下方端側に導電接着により接続される。
したがって、前記巻線ワイヤー(マグネットワイヤー)1と前記磁心2との間で分布容量を取ることが出来る。
さらに、前記導電材料4の間でより多くの分布容量を取ることが出来る。
【0015】
次に、上記(4)面搭載型チョーク(トロイダル)における導電材料4の被覆なし「無し」、1/2の被覆「No.1」、3/4の被覆「No.2」、1/4の被覆「No.3」の場合におけるラッピング用ETFEワイヤーでの特性比較を表5に示す。
【表5】
Figure 2004311866
【0016】
そして、表6に示すように、カーボン塗布による容量値の比較から、被覆無しより被覆有りの方が多く取れることが明らかである。
【表6】
Figure 2004311866
なお、C0は「無し」、C1は「No.1」、C2は「No.2」、C3は「No.3」をそれぞれ示している。
【0017】
また、表7は、カーボン塗布条件によるインピーダンスを表している。
【表7】
Figure 2004311866
【0018】
【効果】
以上述べた如く、本発明のチョークコイルは、磁性材料の固有抵抗が低い磁心と、その磁心と直接導電状態に接続したアース用リードを形成したアース端子を持ち、前記磁心をケース又は絶縁塗料で覆い、その上に巻線ワイヤー(マグネットワイヤー)が施されたものであり、巻線ワイヤー(マグネットワイヤー)と磁心間の絶縁材料及び空間による分布容量を利用し、高周波成分をアースへ流れる機能及び製品自体の放熱効果機能を持たせたものである。
本発明のチョークコイルは、チョークコイル本体をアースとし、主に巻線ワイヤー(マグネットワイヤー)の被覆にカーボンペースト等の導電材料を使用した構造のコンデンサーとしているため、10から2000PF程度まで分布容量を容易に取ることが出来る。
また、本発明のチョークコイルは、分布容量をカーボンペーストの塗布量でコントロールできるため、ある程度のコイル単体でフィルター特性をコンパクトに設計できる。
【図面の簡単な説明】
【図1】本発明のチョークコイルのカーボン塗布無しの説明図である。
【図2】本発明のチョークコイルのカーボン塗布有りの説明図である。
【図3】本発明のチョークコイルの絶縁塗装タイプの説明図である。
【図4】本発明のチョークコイルのコアケース絶縁タイプの説明図である。
【図5】低電圧・信号系リードタイプチョークコイル(磁心比抵抗が低い)の場合の説明図である。
【図6】低電圧・信号系リードタイプチョークコイル(磁心比抵抗が高い)の場合の説明図である。
【図7】面搭載型チョーク(トロイダル)の場合の説明図である。
【図8】従来公知のノイズフィルタの説明図である。
【符号の説明】
1 巻線ワイヤー(マグネットワイヤー)
2 磁心
3 絶縁材料
4 導電材料
5 コイル端末
6 アース用リード
7 コアケース[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a choke coil having a structure in which a high frequency signal can be bypassed to a ground side in the coil itself.
[0002]
[Prior art]
The choke coil is a coil having a small resistance value and a large inductance value, in order to allow a direct current to pass therethrough and prevent a high frequency alternating current from passing therethrough.
Conventionally, choke coils have a considerable amount of stray capacitance. This stray capacitance bypasses the choke coil, and acts to hinder high-frequency characteristics (noise reduction effect) due to the inductance of the choke coil. As a result, the attenuation characteristic of the noise filter is deteriorated.
However, as a known technique for improving the filter's attenuation characteristics, a stray capacitance caused by a winding of a choke coil, which is a cause of deteriorating the attenuation characteristics of a noise filter, is used as a bypass capacitor. -346472.
[0003]
[Patent Document]
In Japanese Patent Application Laid-Open No. H11-346472, as shown in FIG. 8, in a noise filter including a printed wiring board A and common mode choke coils L1 and L2, at least one common mode choke coil is covered with a conductor C. This eliminates the stray capacitance that degrades the filter's attenuation characteristics, and the floating capacitance acts as a line bypass capacitor to form a distributed constant filter, thereby dramatically reducing the filter's attenuation characteristics. It will improve.
[0004]
[Problems to be solved by the invention]
Still another object of the present invention is to provide a choke coil having a structure in which a high frequency signal can be bypassed to the ground side in the coil itself.
[0005]
[Means for Solving the Problems]
The choke coil of the present invention has a magnetic core having a low specific resistance of a magnetic material and a ground terminal formed with a ground lead directly connected to the magnetic core in a conductive state, and covers the magnetic core with a case or insulating paint. It is the one with the winding wire.
Further, the magnetic core has a specific resistance of 50-Ωm or less.
Further, the magnetic material may be Mn-Zn-based soft ferrite, sendust, amorphous and similar metal molding materials for metal-based materials, iron-based, iron alloy-based, and other metal powder-based conductive materials for compacted materials. It becomes.
In the choke coil of the present invention, a grounding lead is set on the choke coil main body, and the winding wire is covered with a paste-like conductive material so as to have the same potential as the grounding lead.
[0006]
BEST MODE FOR CARRYING OUT THE INVENTION
As shown in FIG. 1, the choke coil of the present invention has a magnetic core 2 having a low specific resistance of a magnetic material, and an earth terminal formed with an earth lead directly connected to the magnetic core 2 in a conductive state. It is covered with a case or an insulating paint, and a winding wire 1 is applied thereon, and a high-frequency component is removed by utilizing the distributed capacity due to the insulating material 3 and the space between the winding wire (magnet wire) 1 and the magnetic core 2. It has the function of flowing to the ground and the heat radiation effect of the product itself.
Further, as shown in FIG. 2, a ground lead is set on the choke coil main body, and a winding wire (magnet wire) 1 is connected to a paste-like conductive material such as paste carbon so as to have the same potential as the ground lead. It is used by coating with the material 4, and adjusts and increases the distributed capacity.
That is, as shown in FIG. 2, the choke coil of the present invention has a counter electrode over the entire circumference of the coil, so that the counter electrode area is large, the gap between the electrodes is narrow, and the capacitance value range is several PF. The design can be changed to up to several thousand PF, and the degree of design freedom is large.
[0007]
【Example】
Hereinafter, embodiments of the choke coil of the present invention will be described with reference to the drawings, but the present invention is not limited thereto.
(1) Toroidal type As shown in FIG. 3, a magnetic material having a specific resistance of 50-Ωm or less, such as Mn—Zn-based soft ferrite, sendust, amorphous and similar metal molding materials for metallic ferrite, pressure As the powder material, an annular magnetic core 2 made of an iron-based, iron alloy-based, or other metal powder-based conductive material, and an earth lead 6 directly and electrically conductively bonded to the magnetic core 2 with a conductive adhesive or the like. The magnetic core 2 is covered with an insulating paint 3 having a formed ground terminal, and a winding wire (magnet wire) 1 is provided thereon.
The winding wire (magnet wire) 1 has a coil terminal 5 at an outer diameter end, is spirally wound around an annular magnetic core 2 having a small specific resistance, and has a coil terminal 5 at an outer diameter end.
By conductively bonding the ground lead 6 to the magnetic core 2, a distributed capacitance is generated between the magnetic core itself and the coil conductor wound at the same time as the function of the original magnetic material. The high frequency characteristics of the choke coil can be further improved.
As shown in FIG. 4, the core 2 is covered with a core cover 7 coated with a conductive material 4 on the inner surface, and a winding wire (magnet wire) 1 is provided thereon. By conductively bonding the lead 6, the dimension between the coil and the electrode can be reduced, and a larger distributed capacitance can be generated, whereby a similar effective improvement characteristic can be obtained even for a magnetic core having a high specific resistance. Can be done.
[0008]
Next, Tables 1 to 4 show characteristics of the choke coil according to the present invention and those of the conventional choke coil.
The conventional choke coil is obtained by covering a toroidal magnetic core of Mn-Zn-based ferrite with a plastic case cover, and winding it with a winding wire (magnet wire) thereon. As shown in FIG. 4, a ground lead 6 is electrically conductively bonded to the magnetic core 2 inside the case cover 7, and the terminal is drawn out.
Comparison of the overall characteristics of the conventional choke coil and the choke coil equipped with the earth of the present invention (Table 1)
[Table 1]
Figure 2004311866
Significant improvement in characteristics is seen in the high frequency range.
[0009]
Choke coil inductance characteristics (Table 2)
[Table 2]
Figure 2004311866
Since both conditions are the same, the characteristics are the same.
[0010]
The state of the distributed capacitance generated between the winding wire (magnet wire) and the magnetic core of the present invention (Table 3)
[Table 3]
Figure 2004311866
[0011]
Distribution capacitance and coil impedance characteristics generated by the present invention (Table 4)
[Table 4]
Figure 2004311866
It can be seen that the impedance characteristic due to the distributed capacitance works low at high frequencies and the characteristics at high frequencies are improved.
[0012]
(2) In the case of a low voltage / signal type lead type choke coil (low magnetic core specific resistance) As shown in FIG. 5, a winding wire (magnet wire) 1 has a coil terminal 5 at one end, and has a specific resistance. It is spirally wound around a small cylindrical magnetic core 2 and has a coil end 5 at the other end.
In addition, a ground terminal 6 is connected to the other end of the magnetic core 2 by conductive bonding, so that the core itself has a distributed capacitance between itself and the coil conductor wound with the same function as the magnetic material. Therefore, the high-frequency signal portion can be bypassed to the ground, and the high-frequency characteristics of the choke coil are further improved.
Further, the winding wire (magnet wire) 1 is covered with a paste-like conductive material 4 such as paste carbon to cover the center of the magnetic core 2 around which the winding wire (magnet wire) 1 is wound. By forming the portion, the distribution capacitance between the winding wire (magnet wire) 1 and the conductive material 4 can be set to a large value, and the characteristics are improved.
[0013]
(3) In the case of a low voltage / signal type lead type choke coil (high magnetic core specific resistance) As shown in FIG. 6, the winding wire (magnet wire) 1 has a coil terminal 5 at one end and the specific resistance is low. It is spirally wound around a large cylindrical magnetic core 2 and has a coil end 5 at the other end.
A ground terminal 6 is connected to the center of the magnetic core 2 so as to cover the winding wire (magnet wire) 1.
The winding wire (magnet wire) 1 and the ground terminal 6 are covered with a paste-like conductive material 4 such as paste carbon at the center of the magnetic core 2 around which the ground terminal 6 is wound. Form a part.
Therefore, a distributed capacitance can be obtained between the winding wire (magnet wire) 1 and the conductive material 4.
[0014]
(4) In the case of a surface-mounted choke (toroidal) As shown in FIG. 7, a winding wire (magnet wire) 1 has a coil end 5 at an inner diameter end, and has a spiral shape around an annular magnetic core 2 having a small specific resistance. And has a coil end 5 at the outer diameter end.
Then, a predetermined area of the magnetic core 2 around which the winding wire (magnet wire) 1 is wound is covered with the paste-like conductive material 4 such as paste carbon to cover the winding wire (magnet wire) 1 and conduct. Form a part.
In addition, a ground terminal 6 is connected to the lower end side of the magnetic core 2 not covered with the conductive material 4 by conductive bonding.
Therefore, a distributed capacitance can be obtained between the winding wire (magnet wire) 1 and the magnetic core 2.
Further, more distributed capacitance can be obtained between the conductive materials 4.
[0015]
Next, in the above (4) surface-mounted type choke (toroidal), there is no coating of the conductive material 4 "none", 1/2 coating "No. 1", 3/4 coating "No. 2", 1/4. Table 5 shows a comparison of characteristics of the wrapping ETFE wire in the case of the coating No. 3 of No. 3.
[Table 5]
Figure 2004311866
[0016]
And, as shown in Table 6, it is clear from the comparison of the capacitance values by the carbon application that the presence of the coating can be larger than that without the coating.
[Table 6]
Figure 2004311866
C0 indicates "No", C1 indicates "No. 1", C2 indicates "No. 2", and C3 indicates "No. 3".
[0017]
Table 7 shows the impedance according to the carbon application conditions.
[Table 7]
Figure 2004311866
[0018]
【effect】
As described above, the choke coil of the present invention has a magnetic core having a low specific resistance of a magnetic material, and a ground terminal formed with a ground lead directly connected to the magnetic core in a conductive state, and the magnetic core is formed of a case or insulating paint. It is covered with a winding wire (magnet wire) on it, and uses the insulating material between the winding wire (magnet wire) and the magnetic core and the distributed capacity due to the space, and the function of flowing high frequency components to the ground. The product itself has a heat dissipation function.
Since the choke coil of the present invention is a capacitor having a structure in which the choke coil body is grounded and a conductive material such as carbon paste is mainly used for covering the winding wire (magnet wire), the distribution capacity is about 10 to 2000 PF. Easy to take.
In the choke coil according to the present invention, the distribution capacity can be controlled by the amount of the carbon paste applied, so that the filter characteristics can be designed to be compact with a certain amount of coil alone.
[Brief description of the drawings]
FIG. 1 is an explanatory view of a choke coil of the present invention without carbon coating.
FIG. 2 is an explanatory view of the choke coil of the present invention with carbon coating.
FIG. 3 is an explanatory view of an insulating coating type of a choke coil of the present invention.
FIG. 4 is an explanatory view of a core case insulation type of the choke coil of the present invention.
FIG. 5 is an explanatory diagram in the case of a low voltage / signal system lead type choke coil (low magnetic core specific resistance).
FIG. 6 is an explanatory diagram in the case of a low voltage / signal system lead type choke coil (high magnetic core specific resistance).
FIG. 7 is an explanatory diagram in the case of a surface-mounted choke (toroidal).
FIG. 8 is an explanatory diagram of a conventionally known noise filter.
[Explanation of symbols]
1 winding wire (magnet wire)
2 Magnetic core 3 Insulating material 4 Conductive material 5 Coil terminal 6 Ground lead 7 Core case

Claims (4)

磁性材料の固有抵抗が低い磁心と、該磁心と直接導電状態に接続したアース用リードを形成したアース端子を持ち、前記磁心をケース又は絶縁塗料で覆い、その上に巻線ワイヤーが施されたことを特徴とするチョークコイル。A magnetic core having a low specific resistance of the magnetic material and a ground terminal formed with a ground lead directly connected to the magnetic core in a conductive state, the magnetic core was covered with a case or insulating paint, and a winding wire was provided thereon. A choke coil characterized in that: 前記磁心の固有抵抗が50−Ωm以下であることを特徴とする請求項1記載のチョークコイル。The choke coil according to claim 1, wherein the specific resistance of the magnetic core is 50-Ωm or less. 前記磁性材料がソフトフェライトではMn−Zn系、金属系ではセンダスト、アモルファス及びそれら類似の金属成形材料、圧粉材料では鉄系、鉄合金系、その他金属粉末系の導電性を有する材料からなることを特徴とする請求項1又は2記載のチョークコイル。The magnetic material is made of Mn-Zn-based soft ferrite, sendust, amorphous and similar metal molding materials for metal-based materials, and iron-based, iron alloy-based, and other metal powder-based conductive materials for compacted materials. The choke coil according to claim 1 or 2, wherein: アース用リードがチョークコイル本体にセットされており、前記アース用リードと同電位になるように巻線ワイヤーをペースト状の導電材料で被覆することを特徴とするチョークコイル。A choke coil wherein a grounding lead is set on the choke coil main body, and the winding wire is covered with a paste-like conductive material so as to have the same potential as the grounding lead.
JP2003106302A 2003-04-10 2003-04-10 Choke coil Pending JP2004311866A (en)

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JP2008205295A (en) * 2007-02-21 2008-09-04 Nec Tokin Corp Inductance element and noise filter using the same
JP2009224687A (en) * 2008-03-18 2009-10-01 Nec Tokin Corp Inductance element
US7714683B2 (en) 2006-10-10 2010-05-11 Nec Tokin Corporation Inductance device, filter device comprising the same, and noise filter comprising the same
JP2017005572A (en) * 2015-06-12 2017-01-05 Necトーキン株式会社 Noise filter, multistage connection lc filter and medical apparatus
WO2022014065A1 (en) * 2020-07-15 2022-01-20 三菱電機株式会社 Common mode choke coil and noise filter circuit equipped with said common mode choke coil

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Publication number Priority date Publication date Assignee Title
JP2008098307A (en) * 2006-10-10 2008-04-24 Nec Tokin Corp Inductance element
US7714683B2 (en) 2006-10-10 2010-05-11 Nec Tokin Corporation Inductance device, filter device comprising the same, and noise filter comprising the same
EP2200178A1 (en) 2006-10-10 2010-06-23 Nec Tokin Corporation Inductance device and noise filter comprising the same
EP2312752A1 (en) 2006-10-10 2011-04-20 Nec Tokin Corporation Inductance device and noise filter comprising the same
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JP2008205295A (en) * 2007-02-21 2008-09-04 Nec Tokin Corp Inductance element and noise filter using the same
JP2009224687A (en) * 2008-03-18 2009-10-01 Nec Tokin Corp Inductance element
JP2017005572A (en) * 2015-06-12 2017-01-05 Necトーキン株式会社 Noise filter, multistage connection lc filter and medical apparatus
WO2022014065A1 (en) * 2020-07-15 2022-01-20 三菱電機株式会社 Common mode choke coil and noise filter circuit equipped with said common mode choke coil
JP7005816B1 (en) * 2020-07-15 2022-01-24 三菱電機株式会社 A noise filter circuit equipped with a common mode choke coil and its common mode choke coil.

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