JPH048978U - - Google Patents

Info

Publication number
JPH048978U
JPH048978U JP4848290U JP4848290U JPH048978U JP H048978 U JPH048978 U JP H048978U JP 4848290 U JP4848290 U JP 4848290U JP 4848290 U JP4848290 U JP 4848290U JP H048978 U JPH048978 U JP H048978U
Authority
JP
Japan
Prior art keywords
bias
core
current
coil
coils
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.)
Granted
Application number
JP4848290U
Other languages
Japanese (ja)
Other versions
JPH0723751Y2 (en
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 filed Critical
Priority to JP4848290U priority Critical patent/JPH0723751Y2/en
Publication of JPH048978U publication Critical patent/JPH048978U/ja
Application granted granted Critical
Publication of JPH0723751Y2 publication Critical patent/JPH0723751Y2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Landscapes

  • Measuring Magnetic Variables (AREA)
  • Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
  • Measurement Of Current Or Voltage (AREA)

Description

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

第１図は本考案の第１実施例の電流センサを示
した図、第２図は第２実施例の電流センサを示し
た図、第３図は第３実施例の電流センサを示した
図、第４図は実施例の実測データ例、第５図は従
来の電流センサを示した図である。 １０……コア、１１……導体、１２……無安定
マルチバイブレータ、１３……比較回路、Ｌ１，
Ｌ２……フエライトコア入りコイル、Ｍ１，Ｍ２
……バイアス用マグネツト、Ｔｒ１，Ｔｒ２……
トランジスタ、Ｃ１〜Ｃ４……コンデンサ、Ｒ１
〜Ｒ８……抵抗、ＯＰ……オペアンプ、ＯＵＴ…
…出力端子、ＬＰＦ１，ＬＰＦ２……ローパスフ
イルタ。 Fig. 1 is a diagram showing a current sensor according to the first embodiment of the present invention, Fig. 2 is a diagram showing a current sensor according to the second embodiment, and Fig. 3 is a diagram showing a current sensor according to the third embodiment. , FIG. 4 is an example of actual measurement data of the embodiment, and FIG. 5 is a diagram showing a conventional current sensor. 10...core, 11...conductor, 12...astable multivibrator, 13...comparison circuit, L1 ,
L 2 ... Coil with ferrite core, M 1 , M 2
 ... Bias magnet, Tr 1 , Tr 2 ...
Transistor, C 1 to C 4 ... Capacitor, R 1
 ~ R8 ...Resistance, OP...Operation amplifier, OUT...
...Output terminal, LPF1 , LPF2 ...Low pass filter.

Claims (1)

【実用新案登録請求の範囲】 (1) センサコイルをそれぞれトランジスタＴｒ
１，Ｔｒ２のコレクタ負荷とした無安定マルチバ
イブレータを備え、 上記センサコイルに、被検出電流による磁界を
与えた際の、上記トランジスタに流れる電流の変
化を検出することにより、直流電流を非接触で検
出する電流センサにおいて、 上記センサコイルとして、フエライトコア入り
コイルＬ１，Ｌ２を用いると共に、該フエライト
コア入りコイルＬ１，Ｌ２にバイアス磁界を与え
るバイアス用マグネツトＭ１，Ｍ２を設け、 このバイアス用マグネツトを、上記の被検出電
流による磁界と、バイアス用マグネツトによる磁
界が、一方のフエライトコア入りコイルでは同方
向となるように、また他方のフエライトコア入り
コイルでは逆方向となるような極性で配置したこ
とを特徴とする電流センサ。 (2) 上記請求項１記載の電流センサにおいて、 フエライトコア入りコイルＬ１，Ｌ２に、それ
ぞれバイアス用マグネツトＭ１，Ｍ２を固着した
ことを特徴とする電流センサ。 (3) 上記請求項１記載の電流センサにおいて、 バイアス用マグネツトＭ１，Ｍ２の磁束を、フ
エライトコア入りコイルＬ１，Ｌ２へ導くための
バイアス用コアＢＣを、 上記バイアス用マグネツト及びフエライトコア
入りコイルを取り囲むように設け、 上記バイアス用コアにより、磁気シールドを行
つたことを特徴とする電流センサ。[Scope of claims for utility model registration] (1) Each sensor coil is a transistor Tr.
Equipped with an astable multivibrator with a collector load of Tr 1 and Tr 2 , it detects the change in the current flowing through the transistor when a magnetic field due to the current to be detected is applied to the sensor coil, thereby detecting the direct current in a non-contact manner. In the current sensor for detection, ferrite cored coils L 1 and L 2 are used as the sensor coils, and bias magnets M 1 and M 2 are provided to apply a bias magnetic field to the ferrite cored coils L 1 and L 2 . The bias magnet is arranged so that the magnetic field due to the current to be detected and the magnetic field due to the bias magnet are in the same direction for one ferrite core coil and opposite directions for the other ferrite core coil. A current sensor characterized by being arranged with the same polarity. (2) The current sensor according to claim 1, wherein bias magnets M 1 and M 2 are fixed to the ferrite core-containing coils L 1 and L 2 , respectively. (3) In the current sensor according to claim 1, the bias core BC for guiding the magnetic flux of the bias magnets M 1 and M 2 to the ferrite core-containing coils L 1 and L 2 is connected to the bias magnet and the ferrite core. A current sensor characterized in that the bias core is provided to surround a core-containing coil and magnetically shielded by the bias core.
JP4848290U 1990-05-09 1990-05-09 Current sensor Expired - Fee Related JPH0723751Y2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4848290U JPH0723751Y2 (en) 1990-05-09 1990-05-09 Current sensor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4848290U JPH0723751Y2 (en) 1990-05-09 1990-05-09 Current sensor

Publications (2)

Publication Number Publication Date
JPH048978U true JPH048978U (en) 1992-01-27
JPH0723751Y2 JPH0723751Y2 (en) 1995-05-31

Family

ID=31565326

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4848290U Expired - Fee Related JPH0723751Y2 (en) 1990-05-09 1990-05-09 Current sensor

Country Status (1)

Country Link
JP (1) JPH0723751Y2 (en)

Also Published As

Publication number Publication date
JPH0723751Y2 (en) 1995-05-31

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Legal Events

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