JPH02273906A - Common mode inductor - Google Patents

Common mode inductor

Info

Publication number
JPH02273906A
JPH02273906A JP9585589A JP9585589A JPH02273906A JP H02273906 A JPH02273906 A JP H02273906A JP 9585589 A JP9585589 A JP 9585589A JP 9585589 A JP9585589 A JP 9585589A JP H02273906 A JPH02273906 A JP H02273906A
Authority
JP
Japan
Prior art keywords
common
coils
common mode
coil
toroidal core
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP9585589A
Other languages
Japanese (ja)
Inventor
Masazumi Kubota
正純 久保田
Takeshi Yamada
武 山田
Kiyokazu Yoshimura
吉村 喜代和
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Omron Corp
Original Assignee
Omron Corp
Omron Tateisi Electronics Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Omron Corp, Omron Tateisi Electronics Co filed Critical Omron Corp
Priority to JP9585589A priority Critical patent/JPH02273906A/en
Publication of JPH02273906A publication Critical patent/JPH02273906A/en
Pending legal-status Critical Current

Links

Landscapes

  • Coils Or Transformers For Communication (AREA)

Abstract

PURPOSE:To effectively remove common mode noise by winding multiple going coils around one toroidal core. CONSTITUTION:Multiple going coils 12 and one common returning coil 11 are wound around a piece of toroidal core 10. That is, the common returning coil 11 is wound around one side of the toroidal core 10 composed of ferrite base iron core in high permeability while multiple going coils 12 are wound around the other side as if opposing to the common returning coil 11. The turn number of the coil 11 for common line and the coils 12 for signal lines are the same. Accordingly, when a current runs in the common returning coil 11 and either one of the going coils 12, the magnetic flux generated in the toroidal core 10 is cancelled by the current which is prevented from running to the device side. Through these procedures, the common inductance can be applied to both going and returning coils thereby enabling any common mode noise to be removed effectively.

Description

【発明の詳細な説明】 (a)産業上の利用分野 この発明は信号ラインや電源ラインと大地との間に生じ
るコモンモードノイズを素子するコモンモード用インダ
クタに関する。
DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application This invention relates to a common mode inductor that removes common mode noise generated between a signal line or a power supply line and the ground.

(bl従来の技術 信号ラインや電源ラインで受けたノイズが信号処理回路
に取り込まれるのを防止するための一般的なノイズ対策
部品としてインダクタが用いられる。このうち往復の信
号線路や電源ラインとアース(筐体)との間に生じたコ
モンモードノイズを遮断するためにはコモンモード用イ
ンダクタが用いられる。コモンモード用インダクタは、
1個のトロイダルコアに往路用コイルと復路用コイルと
を巻回したものである。このコイルを信号ラインまたは
電源ラインに挿入することにより、ノイズ信号により往
路用コイルに生じた磁束と復路用コイルに生じた磁束と
が相殺しコモンモードノイズが除去されるようになって
いる。
(bl Conventional technology) Inductors are used as general noise countermeasure components to prevent noise received on signal lines and power lines from being introduced into signal processing circuits. A common mode inductor is used to block common mode noise generated between the
An outbound coil and a return coil are wound around one toroidal core. By inserting this coil into a signal line or a power supply line, the magnetic flux generated in the forward coil and the magnetic flux generated in the return coil due to the noise signal cancel each other out, and common mode noise is removed.

ところで、複数の信号入力端子を有しこのうちl端子が
択一的に使用される信号処理装置では第3図に示すよう
に復路用端子は共通にされ、共通復路とそれぞれの往路
用信号線との間に1個づつコモンモード用インダクタが
挿入されていた。すなわち、信号入力端子がn個ある場
合にはn (Ililのコモンモード用インダクタが用
いられていた。
By the way, in a signal processing device that has a plurality of signal input terminals, of which the l terminal is used selectively, the return path terminal is shared as shown in FIG. 3, and the common return path and each outgoing path signal line One common mode inductor was inserted between each. That is, when there are n signal input terminals, n (Ilil common mode inductors were used).

(C)発明が解決しようとする課題 しかしこのようにコモンモード用インダクタを複数接続
して信号入力端子を択一的に選択した場合、往路におい
ては選択された端子のコモンモード用インダクタにのみ
信号電流が流れるが、復路においては全てのコモンモー
ド用インダクタに信号電流が流れることになる。このた
め往路と復路とでインダクタンスがアンバランスになり
コモンモードノイズを有効に除去できない欠点があった
また択一的に接続される信号線の数が増加するにともな
い実装しなければならないインダクタの数も増加し、装
置の入出力部が大型化する欠点があった。
(C) Problems to be Solved by the Invention However, when a plurality of common mode inductors are connected in this way and a signal input terminal is selectively selected, the signal is sent only to the common mode inductor of the selected terminal on the outward path. Although current flows, signal current flows through all common mode inductors on the return path. As a result, the inductance becomes unbalanced between the forward and return paths, making it impossible to effectively remove common mode noise.Also, as the number of signal lines that are alternatively connected increases, the number of inductors that must be installed increases. There was a disadvantage that the input/output section of the device became larger.

この発明は複数の往路用コイルを一体に巻回したことに
より上記課題を解決したコモンモード用インダクタを提
供することを目的とする。
An object of the present invention is to provide a common mode inductor that solves the above problems by integrally winding a plurality of forward coils.

(d)課題を解決するための手段 この発明は、1個のトロイダルコアに、複数の往路用コ
イルと、1の共通復路用コイルとを巻回したことを特徴
とする。
(d) Means for Solving the Problems The present invention is characterized in that a plurality of forward coils and one common return coil are wound around one toroidal core.

(e)発明の作用 この発明のコモンモード用インダクタでは、複数の往路
用コイルを1個のトロイダルコアに巻回した。これを択
一的に接続される複数の信号線を有する信号処理回路に
挿入することにより、往路と復路のインダクタンスが同
一となり、コモンモードノイズを有効に除去することが
できる。また、複数の信号線を有するにも関わらず、−
個のインダクタを実装するのみでよいため、装置を小型
化することができる利点もある。
(e) Effect of the Invention In the common mode inductor of the present invention, a plurality of forward coils are wound around one toroidal core. By inserting this into a signal processing circuit having a plurality of signal lines that are selectively connected, the inductance of the forward path and the return path become the same, and common mode noise can be effectively removed. Also, despite having multiple signal lines, -
Since it is only necessary to mount one inductor, there is an advantage that the device can be made smaller.

(f)実施例 第1図はこの発明の実施例であるコモンモード用インダ
クタの外観図である。トロイダルコアIOは高透磁率の
フェライト系の鉄心で構成されている。このトロイダル
コアの一方に共通復路用コイル11が巻回され、この共
通復路用コイル11に対向するように複数の往路コイル
12が巻回されている。ターン数は共通線路用コイル1
1.信号線路用コイル12とも同一である。これにより
共通復路用コイル11といずれか1の往路用コイル12
に電流が流れたとき、この電流によりトロイダルコア1
0内に生じた磁束は相殺し、装置側に通過しなくなる。
(f) Embodiment FIG. 1 is an external view of a common mode inductor which is an embodiment of the present invention. The toroidal core IO is composed of a ferrite iron core with high magnetic permeability. A common return coil 11 is wound around one side of the toroidal core, and a plurality of outward coils 12 are wound so as to face the common return coil 11. The number of turns is 1 common line coil.
1. The signal line coil 12 is also the same. As a result, the common return coil 11 and any one of the outward coils 12
When a current flows through the toroidal core 1, this current causes the toroidal core 1 to
The magnetic flux generated within zero cancels out and does not pass through to the device side.

第2図は同コモンモード用インダクタを信号処理回路の
入力部に用いた例を示す。信号処理回路2から復路用信
号線として共通線3が取り出され、択一的に選択される
往路用信号線として4−1〜4−NのN本の信号線が取
り出されている。この共通yA3と信号線4−1〜4−
Nとの間に前記コモンモード用インダクタ1が挿入され
ている。
FIG. 2 shows an example in which the same common mode inductor is used in the input section of a signal processing circuit. A common line 3 is taken out from the signal processing circuit 2 as a return signal line, and N signal lines 4-1 to 4-N are taken out as alternatively selected outgoing signal lines. This common yA3 and signal lines 4-1 to 4-
The common mode inductor 1 is inserted between N and N.

処理すべき信号は往路側信号線4−1〜4−Nのうちい
ずれか1と共通復路線3の間に流れる。これにより往路
復路ともインダクタンスは共通となり、コモンモードノ
イズが有効に除去される。また信号線路がN個あっても
用いられているコモンモード用インダクタは1個でよい
The signal to be processed flows between any one of the outbound signal lines 4-1 to 4-N and the common return line 3. This makes the inductance common to both the forward and return paths, and common mode noise is effectively removed. Further, even if there are N signal lines, only one common mode inductor is used.

fg)発明の効果 以上のようにこの発明のコモンモード用インダクタによ
れば、1個のトロイダルコアに複数の往路用コイルを一
体に巻回したことにより、複数の信号線のうち1の信号
線が択一的に使用された場合でも往路と復路とのインダ
クタンスが同一となりコモンモードノイズを有効に除去
することができる。また、複数の信号線が接続される場
合でも1個のコモンモード用インダクタを用いればよい
ため、装置を小型化できる利点が生じる。
fg) Effects of the Invention As described above, according to the common mode inductor of the present invention, by integrally winding a plurality of forward coils around one toroidal core, one signal line out of a plurality of signal lines Even if the inductance is used alternatively, the inductance of the forward path and the return path will be the same, and common mode noise can be effectively removed. Further, even when a plurality of signal lines are connected, it is sufficient to use one common mode inductor, so there is an advantage that the device can be made smaller.

【図面の簡単な説明】[Brief explanation of drawings]

第1図はこの発明の実施例コモンモード用インダクタの
外観図、第2図は同コモンモード用インダクタを用いた
信号処理回路の入力部の構成を示す図、第3図は従来の
コモンモード用インダクタを用いた信号処理回路の入力
部を示す図である。 コモンモード用インダクタ、 信号処理回路、3−共通線(共通復路)、1〜4−N−
信号線(往路)、 トロイダルコア、 一共通復路用コイル、 往路用コイル。
Fig. 1 is an external view of a common mode inductor according to an embodiment of the present invention, Fig. 2 is a diagram showing the configuration of the input section of a signal processing circuit using the same common mode inductor, and Fig. 3 is a conventional common mode inductor. FIG. 2 is a diagram showing an input section of a signal processing circuit using an inductor. Common mode inductor, signal processing circuit, 3-common line (common return path), 1-4-N-
Signal line (outbound), toroidal core, common return coil, outbound coil.

Claims (1)

【特許請求の範囲】[Claims] (1)1個のトロイダルコアに、複数の往路用コイルと
、1の共通復路用コイルとを巻回してなるコモンモード
用インダクタ。
(1) A common mode inductor in which a plurality of outward coils and one common return coil are wound around one toroidal core.
JP9585589A 1989-04-14 1989-04-14 Common mode inductor Pending JPH02273906A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9585589A JPH02273906A (en) 1989-04-14 1989-04-14 Common mode inductor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9585589A JPH02273906A (en) 1989-04-14 1989-04-14 Common mode inductor

Publications (1)

Publication Number Publication Date
JPH02273906A true JPH02273906A (en) 1990-11-08

Family

ID=14148984

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9585589A Pending JPH02273906A (en) 1989-04-14 1989-04-14 Common mode inductor

Country Status (1)

Country Link
JP (1) JPH02273906A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104376969A (en) * 2014-12-12 2015-02-25 绵阳市容富电子科技有限公司 Common-mode inductor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104376969A (en) * 2014-12-12 2015-02-25 绵阳市容富电子科技有限公司 Common-mode inductor

Similar Documents

Publication Publication Date Title
JPH08213242A (en) Choke coil
EP0901136B1 (en) Inductance device with gap
US5422619A (en) Common mode choke coil
JPH0766041A (en) Inductor
JPH02273906A (en) Common mode inductor
US2689328A (en) Saturable reactor device
JP2003318031A (en) Noise filter
JP2613450B2 (en) Composite choke coil for noise prevention
JP4363148B2 (en) Common mode noise filter
US1561782A (en) Inductance coil
JP2729848B2 (en) AC reactor
JP2580367Y2 (en) Choke coil for noise filter
US3014988A (en) Magnetic saturation control devices
JPS63261907A (en) Noise filter
US2096801A (en) Power transformer
JP2599483B2 (en) Line filter
JP2601901Y2 (en) High frequency choke coil
JPS5915461Y2 (en) pulse transformer
JP3761360B2 (en) Earth leakage breaker
JPH04258106A (en) Power supply transformer device
JPH02235420A (en) Noise filter
JPS63228605A (en) Inductance element
JPS5820129B2 (en) noise filter
JPS6081812A (en) Noise filter transformer
JP2588916Y2 (en) Choke coil for noise filter