JP2018018865A - Common mode choke coil - Google Patents

Common mode choke coil Download PDF

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JP2018018865A
JP2018018865A JP2016145852A JP2016145852A JP2018018865A JP 2018018865 A JP2018018865 A JP 2018018865A JP 2016145852 A JP2016145852 A JP 2016145852A JP 2016145852 A JP2016145852 A JP 2016145852A JP 2018018865 A JP2018018865 A JP 2018018865A
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common mode
choke coil
mode choke
conductor
copper foil
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JP6604917B2 (en
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秀昭 堂口
Hideaki Doguchi
秀昭 堂口
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Cosel Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide a common mode choke coil capable of reducing impact of magnetic flux jumping from the outside, without increasing the cost or the product outline.SOLUTION: A pair of windings 18a, 18b are wound around a resin case 16 covering a toroidal core, so that magnetic fluxes are cancelled each other for normal mode current, and a copper foil tape 22 is arranged in loop around the toroidal core. The copper foil tape is pasted to the outside of a resin case 20 functioning as an insulator arranged around the toroidal core, and the tape end is connected electrically therewith. When external magnetic flux 26 is received from the same direction as the axial line 30 of a loop copper foil tape, an induction current flows through the loop of the copper foil tape, and shields the winding.SELECTED DRAWING: Figure 1

Description

本発明は、ノイズフィルタに設けられてノイズを除去するコモンモードチョークコイルに関する。   The present invention relates to a common mode choke coil that is provided in a noise filter and removes noise.

従来、コモンモードチョークコイルとコンデンサで構成されるノイズフィルタは、電源ラインや通信ライン等を経由して外部から電子機器内に侵入するノイズにより電子機器が誤動作することを防止する装置であり、電子機器にとって必要不可欠である。   Conventionally, a noise filter composed of a common mode choke coil and a capacitor is a device that prevents an electronic device from malfunctioning due to noise entering the electronic device from the outside via a power line, a communication line, etc. Essential for equipment.

図7に正面及び側面で示すように、ノイズフィルタに使用されるコモンモードチョークコイル100は、樹脂ケース102にトロイダルコアが収納されており、トロイダルコアを覆うコア樹脂ケース102に一対の巻線104a,104bがノーマルモード電流に対し磁束が互いに打消しあうように巻き回されており、端子108が取り出された台座106に取り付けられている。   7, the common mode choke coil 100 used for the noise filter has a toroidal core housed in a resin case 102, and a pair of windings 104a on the core resin case 102 covering the toroidal core. , 104b are wound so that the magnetic fluxes cancel each other with respect to the normal mode current, and the terminal 108 is attached to the pedestal 106 taken out.

図8はコモンモードチョークコイルを使用したノイズフィルタ回路であり、AC入力端子110a,110bとAC出力端子112a,112bの間には、コモンモードチョークコイル100を挟んで、相間コンデンサ114をライン間に接続し、各ラインは接地コンデンサ116を介してFG端子により接地されている。コモンモードチョークコイル100はAC入力端子110a,110bとAC出力端子112a,112bの間に接続されて低域のコモンモードノイズを減衰させる。   FIG. 8 shows a noise filter circuit using a common mode choke coil. A common mode choke coil 100 is interposed between the AC input terminals 110a and 110b and the AC output terminals 112a and 112b, and an interphase capacitor 114 is interposed between the lines. Each line is grounded by an FG terminal via a grounding capacitor 116. The common mode choke coil 100 is connected between the AC input terminals 110a and 110b and the AC output terminals 112a and 112b to attenuate low-frequency common mode noise.

相間コンデンサ114はコモンモードチョークコイル100の入力側及び出力側のライン間に接続されて主に低域のノーマルモードノイズを減衰させる。接地コンデンサ116はライン・グランド間に接続されて主に高域のコモンモードノイズを減衰させる。   The interphase capacitor 114 is connected between the input side and output side lines of the common mode choke coil 100 and mainly attenuates low-frequency normal mode noise. The grounding capacitor 116 is connected between the line and the ground to mainly attenuate high-frequency common mode noise.

特開2012−100002号公報JP 2012-100002 A 特開2002−057047号公報JP 2002-057047 A

しかしながら、このような従来のコモンモードチョークコイルにあっては、トロイダルコアに巻き回された巻線104a,104bの向きが一方向ではなく多数の方向を向いており、外部から飛び込む磁束の影響を受けやすい構造となっていたため、外部からの磁束は、巻線104a,104bによって電流に変換され、交流電源ラインにノイズとして流してしまう問題点があった。   However, in such a conventional common mode choke coil, the directions of the windings 104a and 104b wound around the toroidal core are not a single direction but a number of directions. Since the structure is easy to receive, there is a problem that the magnetic flux from the outside is converted into current by the windings 104a and 104b and flows to the AC power supply line as noise.

図8(A)は外部からの磁束120がコモンモードチョークコイル100の巻線104a,104bに均等に飛び込む場合であり、磁束120によって巻線104a,104bに発生する電流の向きはノーマルモード電流i1となって交流電源ラインに流れる。   FIG. 8A shows the case where the external magnetic flux 120 jumps evenly into the windings 104a and 104b of the common mode choke coil 100. The direction of the current generated in the windings 104a and 104b by the magnetic flux 120 is the normal mode current i1. And flows to the AC power line.

図8(B)は、外部から磁束120がコモンモードチョークコイル100の一方の巻線104aに飛び込み、巻線104a,104bに飛び込む磁束のバランスが崩れた場合であり、磁束120によって巻線104aに発生する電流の向きはコモンモード電流i2となって交流電源ラインに流れる。   FIG. 8B shows a case where the magnetic flux 120 from the outside jumps into one winding 104 a of the common mode choke coil 100 and the balance of the magnetic flux jumping into the windings 104 a and 104 b is lost. The direction of the generated current becomes a common mode current i2 and flows to the AC power supply line.

この問題に対して、コモンモードチョークコイルに外部から磁束が飛び込まないように、周辺を強磁性体で覆う方法、磁束の発生源から遠ざける方法、相間コンデンサや接地コンデンサの容量を大きくする方法といった対策をとっているが、部品材料のコストアップ、製品外形の大型化といった問題を発生させている。   Measures against this problem, such as covering the periphery with a ferromagnetic material so that magnetic flux does not enter the common mode choke coil, moving away from the source of magnetic flux, and increasing the capacitance of the interphase capacitor or grounding capacitor However, it has caused problems such as cost increase of parts materials and enlargement of product outer shape.

また、従来技術として、コモンモードチョークコイル自身が発生する漏洩磁束を、漏洩磁束の方向に沿って設けられた帯状の磁気シールド部材によって吸収させるものがある(特許文献2)。   Further, as a conventional technique, there is a technique in which a leakage magnetic flux generated by a common mode choke coil itself is absorbed by a strip-shaped magnetic shield member provided along the direction of the leakage magnetic flux (Patent Document 2).

しかしながら、コモンモードチョークコイルの一部分を磁気シールドで覆った構造では、磁気シールドから露出している巻線の部分に外部からの磁束が飛び込んだ場合、図7及び図8に示した従来のコモンモードチョークコイル100と同様、飛び込んだ磁束を電流に変換し、交流電源ラインにノイズ電流として流してしまう問題がある。   However, in the structure in which a part of the common mode choke coil is covered with the magnetic shield, when the magnetic flux from the outside jumps into the winding portion exposed from the magnetic shield, the conventional common mode shown in FIGS. 7 and 8 is used. Similar to the choke coil 100, there is a problem that the jumped magnetic flux is converted into a current and flows as a noise current in the AC power supply line.

本発明は、コストアップや製品外形を大型化することなく、外部から飛び込む磁束影響を低減可能とするコモンモードチョークコイルを提供することを目的とする。   It is an object of the present invention to provide a common mode choke coil that can reduce the influence of magnetic flux jumping from the outside without increasing the cost and increasing the size of the product.

(コモンモードチョークコイル)
本発明は、トロイダルコアを覆う樹脂ケースに、ノーマルモード電流に対し磁束が互いに打消しあうように複数の巻線が巻き回されたコモンモードチョークコイルに於いて、
複数の巻線が巻き回されたトロイダルコアの周囲を囲んでループ状に導電体が配置されたことを特徴とする。
(Common mode choke coil)
The present invention provides a common mode choke coil in which a plurality of windings are wound around a resin case covering a toroidal core so that magnetic fluxes cancel each other out with respect to a normal mode current.
A conductor is arranged in a loop shape around the toroidal core around which a plurality of windings are wound.

(トロイダルコアと導電体の配置関係)
導電体は、トロイダルコアの軸心線に対し導電体ループの軸心線が直交するように配置され、導電体の軸心線と同方向からの外部磁界により導電体ループに誘導電流を流して巻線をシールドするように構成される。
(Disposition relationship between toroidal core and conductor)
The conductor is arranged so that the axis of the conductor loop is orthogonal to the axis of the toroidal core, and an induced current is passed through the conductor loop by an external magnetic field from the same direction as the axis of the conductor. Configured to shield the winding.

(導電体の材質)
導電体は非強磁性材質の金属で作られる。
(Conductor material)
The conductor is made of a non-ferromagnetic metal.

(銅箔テープ)
導電体は銅箔テープであり、トロイダルコアの周囲を囲んで配置された絶縁テープを含む絶縁物の樹脂ケースの外側に貼り付けられてテープ端部が電気的に接合される。
(Copper foil tape)
The conductor is a copper foil tape, and is affixed to the outside of an insulating resin case including an insulating tape arranged around the toroidal core, and the tape ends are electrically joined.

(銅板又は銅箔)
導電体は銅板又は銅箔であり、トロイダルコアの周囲を囲んで配置された矩形の樹脂ケースの外側に配置される。
(Copper plate or copper foil)
A conductor is a copper plate or copper foil, and is arrange | positioned on the outer side of the rectangular resin case arrange | positioned surrounding the toroidal core.

(基本的な効果)
本発明は、トロイダルコアを覆う樹脂ケースに、ノーマルモード電流に対し磁束が互いに打消しあうように複数の巻線が巻き回されたコモンモードチョークコイルに於いて、複数の巻線が巻き回されたトロイダルの周囲を囲んでループ状に導電体が配置されたため、外部からの磁束が導電体に飛び込むと、導電体で誘導電流に変換されてループ電流が流れ、これによって巻線に到達する磁束が弱められ、交流電源ラインに流れるノイズ電流を低減できる。また、トロイダルコアの周囲を囲んでループ状に導電体を配置するだけで良いことから、構造が簡単であり、部品材料のコストアップや製品外形の大型化といった問題を抑制することができる。
(Basic effect)
The present invention relates to a common mode choke coil in which a plurality of windings are wound around a resin case covering a toroidal core so that magnetic fluxes cancel each other out with respect to a normal mode current. Since the conductor is arranged in a loop around the toroidal, when the magnetic flux from the outside jumps into the conductor, it is converted into an induced current by the conductor, and the loop current flows, thereby the magnetic flux reaching the winding Is weakened, and the noise current flowing in the AC power supply line can be reduced. Further, since it is only necessary to arrange the conductor in a loop around the toroidal core, the structure is simple, and problems such as an increase in the cost of component materials and an increase in the size of the product can be suppressed.

(トロイダルコアと導電体の配置関係による効果)
また、導電体は、トロイダルコアの軸心線に対し導電体ループの軸心線が直交するように配置され、導電体の軸心線と同方向からの外部磁界により導電体ループに誘導電流を流して巻線をシールドするように構成したため、導電体の軸心線と同方向からの外部磁界の飛び込みに対し効率よくループ電流に変換して、巻線に対する磁束の影響を弱めて交流電源ラインに流れるノイズ電流を低減できる。
(Effects of the arrangement relationship between the toroidal core and the conductor)
The conductor is arranged so that the axis of the conductor loop is orthogonal to the axis of the toroidal core, and an induced current is applied to the conductor loop by an external magnetic field from the same direction as the axis of the conductor. Since it is configured to shield the winding by flowing, it effectively converts the jump of external magnetic field from the same direction as the axis of the conductor into a loop current, weakening the influence of magnetic flux on the winding and alternating current power line The noise current flowing through can be reduced.

(導電体の材質による効果)
また、導電体は銅などの導電性の高い非強磁性材質の金属で作られているため、外部から受けた磁束を効率よく導電体ループに流れる誘導電流に変換することで、巻線に対する磁束の影響を弱めることを可能とする。
(Effects of conductor material)
In addition, since the conductor is made of a highly conductive non-ferromagnetic material such as copper, the magnetic flux applied to the winding can be converted by efficiently converting the magnetic flux received from the outside into an induced current flowing in the conductor loop. It is possible to weaken the influence of.

(銅箔テープによる効果)
また、導電体は銅箔テープであり、トロイダルコアの周囲を囲んで配置された絶縁テープを含む絶縁物の外側に貼り付けられてテープ端部が電気的に接合されるようにしたため、トロイダルコアの外側に配置される樹脂ケースに銅箔テープを巻くという簡単な構造により実現でき、部品材料のコストアップや製品外形の大型化といった問題を抑制することができる。
(Effects of copper foil tape)
In addition, the conductor is a copper foil tape, and the end of the tape is electrically bonded by being attached to the outside of the insulator including the insulating tape arranged around the toroidal core. This can be realized by a simple structure in which a copper foil tape is wound around a resin case disposed on the outside, and problems such as an increase in the cost of component materials and an increase in the outer shape of a product can be suppressed.

(銅板又は銅箔による効果)
また、導電体は銅板又は銅箔であり、トロイダルコアの周囲を囲んで配置された矩形の樹脂ケースの外側に配置されるようにしたため、トロイダルコアの外側に配置される樹脂ケースの外側に銅板や銅箔を配置するという簡単な構造により実現でき、銅箔テープの場合と同様、部品材料のコストアップや製品外形の大型化といった問題を抑制することができる。
(Effects of copper plate or copper foil)
In addition, the conductor is a copper plate or a copper foil, and is arranged outside the rectangular resin case arranged around the toroidal core, so that the copper plate is placed outside the resin case arranged outside the toroidal core. As in the case of the copper foil tape, it is possible to suppress problems such as an increase in the cost of component materials and an increase in the outer shape of the product.

導電体として銅箔テープを用いたコモンモードチョークコイルの第1実施形態を正面及び側面から示した説明図Explanatory drawing which showed 1st Embodiment of the common mode choke coil using the copper foil tape as a conductor from the front and the side 図1の実施形態の製造組立の例を示した説明図Explanatory drawing which showed the example of the manufacture assembly of embodiment of FIG. 導電体として銅板を用いたコモンモードチョークコイルの第2実施形態を正面及び側面から示した説明図Explanatory drawing which showed the 2nd embodiment of the common mode choke coil which used the copper plate as a conductor from the front and the side. 図3の実施形態の組立分解状態を示した説明図Explanatory drawing which showed the assembly / disassembly state of embodiment of FIG. 図4の銅板を外周に配置した樹脂ケースを取り出して正面、平面及び側面から示した説明図Explanatory drawing which took out the resin case which has arranged the copper plate of Drawing 4 on the perimeter, and showed it from the front, a plane, and a side トロイダルコアを横に配置したコモンモードチョークコイルの第3実施形態を示した説明図Explanatory drawing which showed 3rd Embodiment of the common mode choke coil which has arrange | positioned the toroidal core sideways 従来のコモンモードチョークコイルを正面及び側面から示した説明図Explanatory drawing showing a conventional common mode choke coil from the front and side コモンモードチョークコイルを用いたノイズフィルタ回路を示した回路図Circuit diagram showing noise filter circuit using common mode choke coil

[コモンモードチョークコイルの第1実施形態]
図1は導電体として銅箔テープを用いたコモンモードチョークコイルの第1実施形態を正面及び側面から示した説明図である。
[First embodiment of common mode choke coil]
FIG. 1 is an explanatory view showing a first embodiment of a common mode choke coil using a copper foil tape as a conductor from the front and side.

図1(A)に示すように、本実施形態のコモンモードチョークコイル10は、端子14を備えた台座12の上に、一対の巻線18a,18bが巻き回まわされ、内部にトロイダルコアを収納したコア樹脂ケース16が取付けられている。コア樹脂ケース16の巻線18a,18bは、ノーマルモード電流に対し磁束が互いに打消しあうように巻き回されている。   As shown in FIG. 1A, in the common mode choke coil 10 of this embodiment, a pair of windings 18a and 18b are wound around a pedestal 12 having terminals 14, and a toroidal core is provided inside. The stored core resin case 16 is attached. The windings 18a and 18b of the core resin case 16 are wound so that the magnetic fluxes cancel each other with respect to the normal mode current.

巻線18a,18bが巻き回されたトロイダルコアのコア樹脂ケース16の周囲を囲んで、上下に開口した箱形の樹脂ケース20が配置され、樹脂ケース20の外側には、ループ状の導電体として機能する銅箔テープ22が貼り付けられており、銅箔テープ22は図1(B)に示すように、テープ端部が接合部24により電気的に接合されており、帯状の導電体矩形ループ状が形成されている。   A box-shaped resin case 20 that is opened up and down is disposed around the core resin case 16 of a toroidal core around which the windings 18a and 18b are wound. A loop-shaped conductor is disposed outside the resin case 20. As shown in FIG. 1 (B), the copper foil tape 22 is attached to the end portion of the copper foil tape 22 by a joining portion 24, and a strip-shaped conductor rectangle is formed. A loop shape is formed.

ここで、ループ状に配置された銅箔テープ22は、コア樹脂ケース16の中心、即ちトロイダルコアの中心を横方向に通る軸心線に対し、銅箔テープ22のループ中心を縦方向に通る軸心線30が直交するように配置され、銅箔テープ22のループ中心の軸心線30と同方向からの外部磁束26を受けた場合に、銅箔テープ22のループに誘導電流が流れるように構成している。   Here, the copper foil tape 22 arranged in a loop shape passes through the center of the core of the core resin case 16, that is, the center of the toroidal core in the longitudinal direction and the center of the loop of the copper foil tape 22 in the longitudinal direction. When the axial center wire 30 is arranged so as to be orthogonal and receives an external magnetic flux 26 from the same direction as the axial center wire 30 at the center of the loop of the copper foil tape 22, an induced current flows through the loop of the copper foil tape 22. It is configured.

また、銅箔テープ22は非強磁性材質であり、導体ループに直交する方向から磁束を受けた場合に、磁束に直交する導体ループに誘導電流が流れることになり、これにより外部からの磁束のエネルギーは銅箔テープ22のループを流れる誘導電流に変換されて弱まり、その内に配置されているコア樹脂ケース16に巻かれた巻線18a,18bを外部磁束26からシールドすることができ、交流電源ラインに流れるノイズ電流を抑制可能とする。   Further, the copper foil tape 22 is made of a non-ferromagnetic material, and when a magnetic flux is received from a direction orthogonal to the conductor loop, an induced current flows through the conductor loop orthogonal to the magnetic flux. The energy is converted into an induced current flowing through the loop of the copper foil tape 22 to be weakened, and the windings 18a and 18b wound around the core resin case 16 disposed therein can be shielded from the external magnetic flux 26. Noise current flowing in the power supply line can be suppressed.

図2は図1の実施形態の製造組立の例を示した説明図である。図2に示すように、本実施形態のコモンモードチョークコイル10の製造組立は、従来と同様に、端子14を備えた台座12に、一対の巻線18a,18bが巻き回まわされ、内部にトロイダルコアを収納したコア樹脂ケース16を取付けたコイルアッセンブリィ10aを準備し、また、上下に開口した樹脂ケース20の外側に、銅箔テープ22を貼り付け、テープ端部をはんだ付け等により接合して準備する。   FIG. 2 is an explanatory view showing an example of manufacturing and assembly of the embodiment of FIG. As shown in FIG. 2, in the manufacturing and assembly of the common mode choke coil 10 according to the present embodiment, a pair of windings 18a and 18b are wound around a pedestal 12 provided with terminals 14 in the same manner as in the past. A coil assembly 10a having a core resin case 16 containing a toroidal core is prepared, and a copper foil tape 22 is attached to the outside of the resin case 20 opened up and down, and the tape ends are joined by soldering or the like. And prepare.

続いて、銅箔テープ22が貼り付けられた樹脂ケース20を、コイルアッセンブリィ10aにおけるコア樹脂ケース16の外側に嵌め入れて台座12側に固定する。   Subsequently, the resin case 20 to which the copper foil tape 22 is attached is fitted to the outside of the core resin case 16 in the coil assembly 10a and fixed to the pedestal 12 side.

このように本実施形態は、従来のコモンモードチョークコイルと同じ構成のコイルアッセンブリィ10aの外側に、銅箔テープ22を張り付けた樹脂ケース20を配置するという簡単な構造で済み、部品材料の増加は僅かで済むことからコストアップが少なく、製品外形が大型化することもない。   As described above, the present embodiment requires a simple structure in which the resin case 20 with the copper foil tape 22 attached is disposed outside the coil assembly 10a having the same configuration as that of the conventional common mode choke coil. Therefore, the cost is small and the outer shape of the product does not increase.

[コモンモードチョークコイルの第2実施形態]
図3は導電体として銅板を用いたコモンモードチョークコイルの第2実施形態を正面及び側面から示した説明図、図4は図3の実施形態の組立分解状態を示した説明図、図5は図4の銅板を外周に配置した樹脂ケースを取り出して正面、平面及び側面から示した説明図である。
[Second Embodiment of Common Mode Choke Coil]
FIG. 3 is an explanatory view showing a second embodiment of a common mode choke coil using a copper plate as a conductor from the front and side, FIG. 4 is an explanatory view showing an assembled and disassembled state of the embodiment of FIG. 3, and FIG. It is explanatory drawing which took out the resin case which has arrange | positioned the copper plate of FIG.

図3に示すように、本実施形態のコモンモードチョークコイル10は、トロイダルコアを収納したコア樹脂ケース16の外側を囲んでループ状に配置する導電体として、樹脂ケース20の外側に、矩形に形成された薄い銅板28を嵌合したことを特徴とする。なお、銅板28に代えて、矩形に形成された銅箔を嵌合しても良い。それ以外の構成は図1の第1実施形態と同じになる。   As shown in FIG. 3, the common mode choke coil 10 of the present embodiment has a rectangular shape on the outside of the resin case 20 as a conductor arranged in a loop surrounding the outside of the core resin case 16 containing the toroidal core. The formed thin copper plate 28 is fitted. Instead of the copper plate 28, a rectangular copper foil may be fitted. Other configurations are the same as those of the first embodiment shown in FIG.

図4に示すように、本実施形態のコモンモードチョークコイル10の製造組立は、従来のコモンモードチョークコイルと同じ構成のコイルアッセンブリィ10aの外側に、銅板28が嵌合された樹脂ケース20を配置するという簡単な構造で済み、部品材料の増加は僅かで済ことからコストアップが少なく、製品外形が大型化することもない。   As shown in FIG. 4, in the manufacture and assembly of the common mode choke coil 10 of this embodiment, the resin case 20 in which the copper plate 28 is fitted to the outside of the coil assembly 10a having the same configuration as that of the conventional common mode choke coil is provided. The arrangement is simple and the increase in component materials is small, so there is little increase in cost and the size of the product does not increase.

また図5に示すように、樹脂ケース20は上下に開口した箱形ケースであり、その外側を囲んでループ状に銅板28が嵌合されており、簡単な構造であることからコストアップも少なく、製品外形も大型化することもない。   Further, as shown in FIG. 5, the resin case 20 is a box-shaped case opened up and down, and a copper plate 28 is fitted in a loop shape so as to surround the outside of the resin case 20, and the cost is low because of the simple structure. The product outline is not enlarged.

[コモンモードチョークコイルの第3実施形態]
図6はトロイダルコアを横に配置したコモンモードチョークコイルの第3実施形態を示した説明図である。
[Third embodiment of common mode choke coil]
FIG. 6 is an explanatory view showing a third embodiment of a common mode choke coil in which a toroidal core is disposed horizontally.

図6に示すように、本実施形態のコモンモードチョークコイル10は、端子14を備えた台座12の上に、一対の巻線18a,18bが巻き回まわされ、内部にトロイダルコアを収納したコア樹脂ケース16が横置きして取付けられている。   As shown in FIG. 6, the common mode choke coil 10 according to the present embodiment includes a core in which a pair of windings 18 a and 18 b are wound around a pedestal 12 including a terminal 14 and a toroidal core is accommodated therein. A resin case 16 is mounted horizontally.

台座12に横置きされた巻線18a,18bが巻き回されたトロイダルコアのコア樹脂ケース16に対しては、側方及び上側を囲んで下側に開口したコ字形の樹脂ケース30が嵌め入れられ、樹脂ケース30の外側から台座12の下側にかけて銅箔テープ22を巻きまわして貼り付け、例えば、台座12の下側に位置するテープ端部を、はんだ付け等により電気的に接合している。   A U-shaped resin case 30 that is open on the lower side surrounding the side and the upper side is fitted into the core resin case 16 of the toroidal core wound around the windings 18a and 18b placed horizontally on the pedestal 12. The copper foil tape 22 is wound and pasted from the outside of the resin case 30 to the lower side of the pedestal 12, and, for example, the tape end located under the pedestal 12 is electrically joined by soldering or the like. Yes.

ここで、ループ状に縦置き配置された銅箔テープ22は、コア樹脂ケース16の中心、即ちトロイダルコアの中心を横方向に通る軸心線に対し、銅箔テープ22のループ中心を横方向に通る軸心線30が直交するように配置され、銅箔テープ22のループ中心の軸心線30と同方向からの外部磁束26を受けた場合に、銅箔テープ22のループに誘導電流が流れ、これにより外部からの磁束のエネルギーは銅箔テープ22のループを流れる誘導電流に変換されて弱まり、その内に配置されているコア樹脂ケース16に巻かれた巻線18a,18bを外部磁束26からシールドすることができ、交流電源ラインに流れるノイズ電流を抑制可能とする。   Here, the copper foil tape 22 vertically arranged in a loop shape is transverse to the loop center of the copper foil tape 22 with respect to the axial center line passing through the center of the core resin case 16, that is, the center of the toroidal core. When the external magnetic flux 26 from the same direction as the axial center line 30 at the center of the loop of the copper foil tape 22 is received, an induced current is generated in the loop of the copper foil tape 22. As a result, the energy of the magnetic flux from the outside is converted into an induced current flowing through the loop of the copper foil tape 22 and weakened, and the windings 18a and 18b wound around the core resin case 16 disposed therein are passed through the external magnetic flux. 26 can be shielded, and the noise current flowing in the AC power supply line can be suppressed.

[本発明の変形例]
上記の実施形態は単相のコモンモードチョークコイルを例にとっているが、これに限定されず、使用する交流の相数、巻線数に対応した適宜のコモンモードチョークコイルが含まれる。
[Modification of the present invention]
In the above embodiment, a single-phase common mode choke coil is taken as an example. However, the present invention is not limited to this, and an appropriate common mode choke coil corresponding to the number of AC phases and the number of windings to be used is included.

また、上記の実施形態は導電体の材質として銅を例にとっているが、銅以外に銅合金やアルミニウム等の非磁性の導電材質としても良い。   In the above embodiment, copper is taken as an example of the material of the conductor, but other than copper, a nonmagnetic conductive material such as a copper alloy or aluminum may be used.

また、図1及び図2に示した第1実施形態における樹脂ケース20に代えて、絶縁テープとしても良い。   Further, instead of the resin case 20 in the first embodiment shown in FIGS. 1 and 2, an insulating tape may be used.

また、本発明はその目的と利点を損なうことのない適宜の変形を含み、更に上記の実施形態に示した数値による限定は受けない。   The present invention includes appropriate modifications without impairing the object and advantages thereof, and is not limited by the numerical values shown in the above embodiments.

10:コモンモードチョークコイル
10a:コイルアッセンブリィ
12:台座
14:端子
16:コア樹脂ケース
18a,18b:巻線
20,30:樹脂ケース
22:銅箔テープ
24:接合部
26:磁束方向



10: Common mode choke coil 10a: Coil assembly 12: Base 14: Terminal 16: Core resin case 18a, 18b: Winding 20, 30: Resin case 22: Copper foil tape 24: Junction 26: Magnetic flux direction



Claims (5)

トロイダルコアを覆う樹脂ケースに、ノーマルモード電流に対し磁束が互いに打消しあうように複数の巻線が巻き回されたコモンモードチョークコイルに於いて、
前記複数の巻き線が巻き回された前記トロイダルコアの周囲を囲んでループ状に導電体が配置されたことを特徴とするコモンモードチョークコイル。
In a common mode choke coil in which a plurality of windings are wound on a resin case covering a toroidal core so that magnetic fluxes cancel each other out with respect to a normal mode current.
A common mode choke coil, wherein a conductor is arranged in a loop surrounding the toroidal core around which the plurality of windings are wound.
請求項1記載のコモンモードチョークコイルに於いて、前記導電体は、前記トロイダルコアの軸心線に対し前記導電体の軸心線が直交するように配置され、導電体ループの軸心線と同方向からの外部磁界により前記導電体ループに誘導電流を流して前記巻線をシールドするように構成されたことを特徴とするコモンモードチョークコイル。
2. The common mode choke coil according to claim 1, wherein the conductor is disposed so that an axis of the conductor is orthogonal to an axis of the toroidal core, and an axis of the conductor loop A common mode choke coil configured to shield the winding by flowing an induced current through the conductor loop by an external magnetic field from the same direction.
請求項1記載のコモンモードチョークコイルに於いて、前記導電体は非強磁性材質の金属で作られたことを特徴とするコモンモードチョークコイル。
2. The common mode choke coil according to claim 1, wherein the conductor is made of a nonferromagnetic metal.
請求項1記載のコモンモードチョークコイルに於いて、前記導電体は銅箔テープであり、前記トロイダルコアの周囲を囲んで配置された絶縁テープを含む絶縁物の外側に貼り付けられてテープ端部が電気的に接合されたことを特徴とするコモンモードチョークコイル。
2. The common mode choke coil according to claim 1, wherein the conductor is a copper foil tape, and is attached to the outside of an insulator including an insulating tape disposed around the toroidal core, so that an end portion of the tape is attached. Is a common mode choke coil characterized by being electrically joined.
請求項1記載のコモンモードチョークコイルに於いて、前記導電体は銅板又は銅箔であり、前記トロイダルコアの周囲を囲んで配置された矩形の樹脂ケースの外側に配置されたことを特徴とするコモンモードチョークコイル。   2. The common mode choke coil according to claim 1, wherein the conductor is a copper plate or a copper foil, and is disposed outside a rectangular resin case disposed around the toroidal core. Common mode choke coil.
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