JPH0743389A - Current detector for line current detection - Google Patents
Current detector for line current detectionInfo
- Publication number
- JPH0743389A JPH0743389A JP5208744A JP20874493A JPH0743389A JP H0743389 A JPH0743389 A JP H0743389A JP 5208744 A JP5208744 A JP 5208744A JP 20874493 A JP20874493 A JP 20874493A JP H0743389 A JPH0743389 A JP H0743389A
- Authority
- JP
- Japan
- Prior art keywords
- current
- magnetic core
- line
- magnetic
- initializing
- 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
Links
Landscapes
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、電話機、ファックス等
の回線電流検出用電流検出器であって、電流検出器の構
成部品である磁性体コアの磁化状態を初期化することに
よって、検出精度を向上させた電流検出器に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is a current detector for detecting a line current in telephones, fax machines, etc., in which the detection accuracy is improved by initializing the magnetization state of a magnetic core which is a component of the current detector. To a current detector having improved
【０００２】[0002]
【従来の技術】図４に従来の回線電流検出用電流検出器
のブロック図を示す。磁性体コア１１の磁路の一部には
空隙３１が設けられ、その空隙３１内にホール素子４１
が設置されており、該ホール素子４１の出力電圧が差動
増幅器４４を通して増幅され、ついでコンパレータ４２
に入力され、前もって設定した被検出電流に対応させた
基準電圧４３と差動増幅器４４からの出力電圧の比較に
よって、回線電流Ｉ1を検出する。図５は、その検出の
原理を示したものである。図５に示すヒステリシス曲線
にて磁性体コア１１がＢ−Ｈヒステリシス曲線のほぼ原
点に初期化されている。回線に被検出の直流電流が流
れると、それにより磁性体コア１１内に起磁力が発生
し、その印加磁場が磁性体コア１１の空隙３１内に磁場
を発生させる。磁性体コア１１の動作点はＢ−Ｈヒステ
リシス曲線上を移動し、例えば図５における回線電流Ｉ
1にて発生する磁場Ｈ1によるホール素子３１からの出力
電圧をしきい値としてコンパレータ４２の基準電圧４３
を設定すれば、図５のヒステリシス曲線のＡ点にて回線
電流が電流値Ｉ1となったことが検出される。一般に、
回線電流は最大で±１００ｍＡ前後まで流れ、この範囲
内では強磁性体コアの磁化状態、即ちＢ−Ｈヒステリシ
ス曲線特性がほぼ直線範囲にある。もし、大きな回線電
流が流れ、動作点が飽和磁化状態のまで達した後、回
線電流が遮断されると、動作点はヒステリシス曲線に沿
って残留磁化状態のへ達して保持される。このの状
態は明かに前の初期のの状態とは異なる。従って、再
度前記と同方向の回線電流が流れた場合には、残留磁化
状態のより動作が開始し、ヒステリシス曲線に沿って
磁束Ｂが増加する。従って、前記のコンパレータ４２の
設定点Ｂ点で電流検出の出力が得られるが、実際の電流
値は印加磁場Ｈ2に相当する回線電流値Ｉ2である。よっ
て、図のごとく△Ｈ＝Ｈ1−Ｈ2の印加磁場の差に相当す
る電流値△Ｉが誤差として発生する。本発明は、この誤
差を解消することにある。2. Description of the Related Art FIG. 4 shows a block diagram of a conventional line current detecting current detector. A void 31 is provided in a part of the magnetic path of the magnetic core 11, and the Hall element 41 is provided in the void 31.
Is installed, the output voltage of the Hall element 41 is amplified through a differential amplifier 44, and then the comparator 42
The line current I 1 is detected by comparing the reference voltage 43 corresponding to the preset detected current and the output voltage from the differential amplifier 44. FIG. 5 shows the principle of the detection. In the hysteresis curve shown in FIG. 5, the magnetic core 11 is initialized to almost the origin of the BH hysteresis curve. When a DC current to be detected flows through the line, a magnetomotive force is generated in the magnetic core 11, and the applied magnetic field generates a magnetic field in the void 31 of the magnetic core 11. The operating point of the magnetic core 11 moves on the BH hysteresis curve, and for example, the line current I in FIG.
The reference voltage 43 of the comparator 42 uses the output voltage from the Hall element 31 due to the magnetic field H 1 generated at 1 as the threshold value.
If is set, it is detected that the line current becomes the current value I 1 at the point A of the hysteresis curve of FIG. In general,
The line current flows up to about ± 100 mA at maximum, and within this range, the magnetization state of the ferromagnetic core, that is, the BH hysteresis curve characteristic is in a substantially linear range. If a large line current flows and the operating point reaches the saturation magnetization state and then the line current is cut off, the operating point reaches and is maintained at the residual magnetization state along the hysteresis curve. This state is distinctly different from the previous earlier state. Therefore, when the line current flows in the same direction as described above again, the operation starts due to the residual magnetization state, and the magnetic flux B increases along the hysteresis curve. Therefore, the output of the current detection is obtained at the set point B of the comparator 42, but the actual current value is the line current value I 2 corresponding to the applied magnetic field H 2 . Therefore, as shown in the figure, a current value ΔI corresponding to the difference of the applied magnetic field of ΔH = H 1 −H 2 is generated as an error. The present invention is to eliminate this error.
【０００３】[0003]
【発明が解決しようとする課題】本発明が解決しようと
する課題は、電流検出器の主要構成部品である磁性体コ
アがもつＢ−Ｈヒステリシス曲線特性の残留磁化状態に
よって、該電流検出器の測定値に誤差が発生する。その
測定値の誤差を解消した電流検出器を供することにあ
る。SUMMARY OF THE INVENTION The problem to be solved by the present invention is that, due to the remanent magnetization state of the BH hysteresis curve characteristic of the magnetic core which is the main component of the current detector, the current detector There is an error in the measured value. The purpose is to provide a current detector that eliminates the error in the measured value.
【０００４】[0004]
【課題を解決するための手段】本発明は、上記問題点を
解決するために、磁性体コア内部の磁化状態を初期化す
るため、（１）磁性体コアに巻線された第１のコイル部
分は回線電流検出用であって、被測定回線に接続され、
該磁性体コアに巻線された第２のコイル部分は該磁性体
コア内部の磁化状態を初期化させるための特定の直流、
もしくは交流の電流が通電可能であることを特徴とする
回線電流検出用電流検出器、及び（２）第１のコイル部
分の端子部はスイッチ回路に接続され、電流検出時は該
スイッチ回路により被測定の回線に直列に接続され、一
方磁性体コアの初期化時には該スイッチ回路によって初
期化電流供給用の増幅器の出力端に接続され、特定の直
流電流を第１のコイル部分に通電して磁性体コアの磁化
状態の初期動作点を同一極性の残留磁化状態に常に初期
化し、あるいは特定の交流電流を該第１のコイル部分に
通電して、磁性体コアの初期の動作点をほぼ残留磁束を
持たない原点に初期化させることを特徴とする回線電流
検出用電流検出器、及び（３）上記（１）及び（２）の
磁性体コアを初期化するために流す電流は直流であっ
て、前記磁性体コアを少なくともＢ−Ｈヒステリシス曲
線の飽和磁化状態まで推移させるのに必要な電流値を通
電した後、該電流値を零として磁性体コアの磁化状態を
常に同一極性に残留磁化を持つように初期化することを
特徴とする回線電流検出用電流検出器、及び（４）上記
（１）及び（２）の磁性体コアの磁化状態を初期化する
電流は交流であって、通電初期において、その起磁力
が、前記磁性体コアの磁化状態をＢ−Ｈヒステリシス曲
線の飽和状態まで交流電流を加えた後、徐々にその交流
電流値を減少させていき、ほぼ零の交流電流値まで減少
させて、前記磁性体コアの磁化状態を残留磁化が零に近
いほぼ原点に初期化することを特徴とする回線電流検出
用電流検出器である。SUMMARY OF THE INVENTION In order to solve the above problems, the present invention is directed to (1) a first coil wound around a magnetic core in order to initialize the magnetization state inside the magnetic core. The part is for line current detection, connected to the line under test,
The second coil portion wound around the magnetic core is a specific direct current for initializing the magnetization state inside the magnetic core,
Alternatively, a current detector for detecting a line current, which is characterized in that an alternating current can be conducted, and (2) the terminal portion of the first coil portion is connected to a switch circuit, and the current is detected by the switch circuit. On the other hand, it is connected to the measurement line in series, and at the time of initialization of the magnetic core, it is connected to the output end of the amplifier for supplying the initialization current by the switch circuit, and a specific direct current is passed through the first coil portion to magnetize The initial operating point of the magnetized state of the body core is always initialized to the remanent magnetized state of the same polarity, or a specific alternating current is passed through the first coil portion so that the initial operating point of the magnetic core is almost the residual magnetic flux. A current detector for line current detection, which is characterized by being initialized to an origin having no direct current, and (3) the current flowing to initialize the magnetic cores of (1) and (2) above is direct current. , The magnetic core After passing a current value at least required to change to the saturated magnetization state of the BH hysteresis curve, the current value is set to zero and the magnetization state of the magnetic core is always initialized to have the residual magnetization with the same polarity. And (4) the current for initializing the magnetization state of the magnetic core of (1) and (2) above is an alternating current, and the magnetomotive force of the magnetomotive force at the initial stage of energization is However, after the alternating current is applied to the magnetized state of the magnetic core to the saturation state of the BH hysteresis curve, the alternating current value is gradually reduced to the almost zero alternating current value, The current detector for line current detection is characterized in that the magnetization state of the magnetic core is initialized to approximately the origin where the residual magnetization is close to zero.
【０００５】[0005]
【作用】上記課題を解決するための手段の（１）の方法
としては、強磁性体コアに第１のコイル部分（被検出巻
線）、及び第２のコイル部分（磁性体コア初期化のたの
電流通電用のコイル）を巻線して、前記第２のコイルに
直流、あるいは交流を通電可能にしたので、磁性体コア
を初期化することが可能になった。あるいは、上記
（２）の方法としては、第１のコイル部分にスイッチ回
路を設け、被測定電流が流れる該回線、あるいは初期化
用電流を供給する回路の出力端子に切り換えて、第１の
コイル部分に磁性体コア初期化用の特定の直流、あるい
は交流電流を通電する方法であり、磁性体コアに巻線さ
れるコイル部分が一つだけで良く、小形化と廉価な電流
検出器が提供できる。このような方法によって、磁性体
コア内の磁化状態を常に初期化状態に保ち、被測定電流
による磁性体コア内の磁化状態はその初期化状態から常
に起算するので、測定値が常に安定しており、測定誤差
を最小限にすることが可能である。As a method (1) of the means for solving the above-mentioned problems, the first coil portion (detection winding) and the second coil portion (for magnetic core initialization of the ferromagnetic core) are provided. Another current energizing coil) is wound so that direct current or alternating current can be applied to the second coil, so that the magnetic core can be initialized. Alternatively, as the above method (2), a switch circuit is provided in the first coil portion, and the first coil is switched to the line through which the current to be measured flows or the output terminal of the circuit for supplying the initialization current. It is a method of passing a specific direct current or alternating current for initializing the magnetic core to the part, only one coil part is wound around the magnetic core, providing a compact and inexpensive current detector it can. By such a method, the magnetized state in the magnetic core is always kept in the initialized state, and the magnetized state in the magnetic core due to the measured current is always calculated from the initialized state, so the measured value is always stable. It is possible to minimize the measurement error.
【０００６】[0006]
【実施例】以下、本発明の実施例について図面を参照し
て説明する。図１（Ａ）は、本発明の電流検出器の一実
施例を示す。磁性体コア１の磁路の一部に空隙３を設け
た磁性体コア１に第１のコイル部分（検出用コイル）２
１、初期化用の第２のコイル部分２２が巻線されてい
る。空隙３内にはホール素子４が設置され、その出力電
圧は回路部５ａの差動増幅器４４により増幅され、コン
パーレータ４２によって基準電圧４３に対して出力電圧
との比較が行われる。前記検出用の第１のコイル部分２
１は被測定回線に接続される。一方、初期化用の第２の
コイル部分２２は磁性体コア１の磁化状態を初期化する
ための電流通電用のコイルであり、回路部５ａ内の波形
発生器４８、増幅器４５の出力電流が初期化用の第２の
コイル部分２２に通電される。初期化用の第２のコイル
部分２２に通電される初期化電流としては、第１の例と
して、一方向の直流電流が１回のみ印加される直流電流
波形［図１（Ｂ）記載］、及び第２の例として、時間と
共に減少していく交流電流波形［図１（Ｃ）記載］があ
る。図２は、本発明による電流検出器の他の実施例であ
る。図２（Ａ）において、磁性体コア１は前記実施例と
同じ構成であり、一部に空隙３が設けてある。空隙３に
はホール素子４が装着され、又磁性体コア１にコイル巻
線２３が巻かれている。切り換えスイッチ６は、コイル
巻線２３の端子２１１及び２１２を、被測定の回線側及
び初期化電流設定用回路の増幅器４５の出力と切り換え
可能となっている。切り換えスイッチ６の切り替えは、
タイミング回路４６からの信号によりスイッチ駆動回路
４７にて駆動されている。初期化電流については前記第
１の実施例と同様の波形であり、図２（Ｂ）の直流によ
る初期化、あるいは図２（Ｃ）の交流による初期化の方
法を用いる。切り換えスイッチ６は、有接点方式のスイ
ッチあるいは電子的な切り換えスイッチの方式いずれで
もよい。本実施例によれば、１個のコイル巻線で磁性体
コア１の初期化と被測定電流検出の二つの働きを処理す
ることができ、センサ部分の巻線、及び端子形成工程を
第１実施例より短縮することができる。上記図１
（Ｂ）、図１（Ｃ）各々の初期化電流の場合の磁性体コ
ア１の磁気特性の状態を示すＢ−Ｈヒステリシス曲線を
図３（Ａ）、及び図３（Ｂ）に示す。図３（Ａ）には、
Ｘ軸に直流の初期化電流による起磁力を用いた場合を示
し、初期化電流印加後は、磁性体コア１の動作点はすべ
て点に残留磁場として保持される。以後、検出状態と
して被測定の回線電流が流れた場合は、図３（Ａ）のＢ
−Ｈヒステリシス曲線上の点→の曲線ライン上を移
動し、例えば磁束密度Ｂ1に対応する磁場Ｈ1が高精度に
検出可能となり、これに対応した回線電流Ｉ1が安定に
検出できる。又、図３（Ｂ）は交流の初期化電流通電の
場合を示す。特定の初期化電流通電後は、動作点はＢ−
Ｈヒステリシス曲線の座標の原点［図３（Ｂ）の点］
に落ち着く。それ以後検出状態として、被測定のための
回線電流が流れた場合、磁性体コア１の動作ラインはＢ
−Ｈヒステリシス曲線の点→の曲線ライン上を移動
し、磁束密度Ｂ2に対応する磁場Ｈ2が安定に高精度に検
出される。従来の方法では初期動作点（起算点）がばら
ついているので、回線電流が流れた場合のＢ−Ｈヒステ
リシス曲線の動作ループがばらつき、従って後段のコン
パレータ４２を通った後の検出電流値がばらつき誤差が
生じるという問題点があった。本発明ではこの点を解決
している。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1A shows an embodiment of the current detector of the present invention. The first coil portion (detection coil) 2 is provided in the magnetic core 1 in which the air gap 3 is provided in a part of the magnetic path of the magnetic core 1.
1. The second coil portion 22 for initialization is wound. The Hall element 4 is installed in the void 3, the output voltage of which is amplified by the differential amplifier 44 of the circuit unit 5a, and the comparator 42 compares the reference voltage 43 with the output voltage. First coil portion 2 for detection
1 is connected to the measured line. On the other hand, the second coil portion 22 for initialization is a coil for energizing current for initializing the magnetized state of the magnetic core 1, and the output current of the waveform generator 48 and the amplifier 45 in the circuit portion 5a is The second coil portion 22 for initialization is energized. As a first example of the initialization current supplied to the second coil portion 22 for initialization, a DC current waveform in which a DC current in one direction is applied only once [described in FIG. 1 (B)], As a second example, there is an alternating current waveform [described in FIG. 1 (C)] that decreases with time. FIG. 2 is another embodiment of the current detector according to the present invention. In FIG. 2A, the magnetic core 1 has the same structure as that of the above-mentioned embodiment, and a void 3 is provided in a part thereof. A Hall element 4 is mounted in the space 3, and a coil winding 23 is wound around the magnetic core 1. The change-over switch 6 is capable of changing over the terminals 211 and 212 of the coil winding 23 to the line side to be measured and the output of the amplifier 45 of the initialization current setting circuit. To change the changeover switch 6,
The switch drive circuit 47 is driven by a signal from the timing circuit 46. The initialization current has the same waveform as that of the first embodiment, and the method of initialization by direct current in FIG. 2B or initialization by alternating current in FIG. 2C is used. The changeover switch 6 may be either a contact switch or an electronic changeover switch. According to the present embodiment, one coil winding can perform the two functions of the initialization of the magnetic core 1 and the detection of the measured current, and the coil winding of the sensor portion and the terminal forming step can be performed first. It can be shortened as compared with the embodiment. Figure 1 above
FIGS. 3 (A) and 3 (B) show BH hysteresis curves showing the state of the magnetic characteristics of the magnetic core 1 in the case of the respective initialization currents of (B) and FIG. 1 (C). In FIG. 3 (A),
A case where a magnetomotive force due to a DC initializing current is used for the X axis is shown. After the initializing current is applied, all operating points of the magnetic core 1 are retained as residual magnetic fields. After that, when the line current to be measured flows as the detection state, B in FIG.
The magnetic field H 1 corresponding to the magnetic flux density B 1 can be detected with high accuracy by moving on the curve line → from the point on the −H hysteresis curve, and the line current I 1 corresponding to this can be stably detected. Further, FIG. 3 (B) shows a case where an AC initializing current is applied. After energizing a specific initialization current, the operating point is B-
Origin of coordinates of H hysteresis curve [point in Fig. 3 (B)]
Calm down. After that, when the line current for the measurement flows in the detection state, the operation line of the magnetic core 1 is B
Move point → curve line above the -H hysteresis curve, magnetic field H 2 corresponding to the magnetic flux density B 2 is detected stably with high precision. In the conventional method, since the initial operating point (starting point) varies, the operation loop of the BH hysteresis curve when a line current flows varies, and therefore the detected current value after passing through the comparator 42 in the subsequent stage varies. There was a problem that an error occurred. The present invention solves this point.
【０００７】[0007]
【発明の効果】以上、本発明によれば、従来は磁性体コ
ア内の磁化状態は初期時点ではランダムな状態にあり、
回線電流検出値に大きな誤差を生じていた。本発明によ
れば、磁性体コアに特定の初期化電流を通電することに
より、磁性体コア内磁化状態を常に一定の値に設定する
ことができ、従って回線電流検出時の磁性体コアの磁化
動作点の移動が一定の値を経由して行われ、回線電流検
出値の精度が従来に比べ格段に改善される。As described above, according to the present invention, the magnetization state in the magnetic core is conventionally random at the initial stage,
There was a large error in the line current detection value. According to the present invention, the magnetization state in the magnetic core can be set to a constant value by supplying a specific initializing current to the magnetic core, and therefore, the magnetization of the magnetic core at the time of detecting the line current can be suppressed. The movement of the operating point is carried out via a fixed value, and the accuracy of the line current detection value is greatly improved compared to the conventional one.
【図１】図１（Ａ）は本発明による回線電流検出用電流
検出器の第１の実施例を示す回路ブロック図であり、図
１（Ｂ）と図１（Ｃ）は実施例における磁性体コア１を
初期化するための電流波形。FIG. 1 (A) is a circuit block diagram showing a first embodiment of a line current detecting current detector according to the present invention, and FIGS. 1 (B) and 1 (C) show magnetic properties in the embodiment. A current waveform for initializing the body core 1.
【図２】図２（Ａ）は本発明による回線電流検出用電流
検出器の第２の実施例を示す回路ブロック図であり、図
２（Ｂ）と図２（Ｃ）は実施例における磁性体コア１を
初期化するための電流波形。FIG. 2 (A) is a circuit block diagram showing a second embodiment of the line current detecting current detector according to the present invention, and FIGS. 2 (B) and 2 (C) show magnetic properties in the embodiment. A current waveform for initializing the body core 1.
【図３】図１又は図２の実施例における磁性体コアの動
作点の初期化を示すＢ−Ｈヒステリシス曲線の図で、図
３（Ａ）は直流で初期化するＢ−Ｈヒステリシス曲線の
図であり、図３（Ｂ）は交流で初期化するＢ−Ｈヒステ
リシス曲線の図。FIG. 3 is a diagram of a BH hysteresis curve showing the initialization of the operating point of the magnetic core in the embodiment of FIG. 1 or FIG. 2, and FIG. 3A is a BH hysteresis curve initialized by DC. It is a figure and FIG.3 (B) is a figure of the BH hysteresis curve initialized by alternating current.
【図４】従来の回線電流検出用電流検出器の例を示す回
路ブロック図。FIG. 4 is a circuit block diagram showing an example of a conventional line current detecting current detector.
【図５】従来の回線電流検出用電流検出器での磁性体コ
ア内の磁化状態を示すＢ−Ｈヒステリシス曲線の図。FIG. 5 is a BH hysteresis curve diagram showing a magnetization state in a magnetic core in a conventional line current detection current detector.
１，１１ 磁性体コア ２，２１ （検出用の）第１のコイル部分 ３，３１ 空隙 ４，４１ ホール素子 ５ａ，５ｂ，５１ 回路部 ６ 切り換えスイッチ ２２ （初期化用の）第２のコイル部分 ２３ コイル巻線 ４２ コンパレータ ４３ 基準電圧 ４４ 差動増幅器 ４５ 増幅器 ４６ タイミング回路 ４７ スイッチ駆動回路 ４８ 波形発生器 ２１１，２１２ コイル巻線２３の端子 1, 11 Magnetic Core 2, 21 (For Detection) First Coil Part 3, 31 Gap 4, 41 Hall Element 5a, 5b, 51 Circuit Part 6 Changeover Switch 22 (For Initialization) Second Coil Part 23 coil winding 42 comparator 43 reference voltage 44 differential amplifier 45 amplifier 46 timing circuit 47 switch drive circuit 48 waveform generator 211, 212 coil winding 23 terminal
Claims (4)
隙内に設置され、該磁性体コアに巻線されたコイルを流
れる回線電流により、該磁性体コア内に発生する磁束を
該ホール素子にて検出し、その出力電圧を回路部にて回
線電流値として測定する電流検出器において、該磁性体
コアに巻線された第１のコイル部分は回線電流検出用で
あって、被測定電流が流れる回線に接続され、該磁性体
コアに巻線された第２のコイル部分は該磁性体コア内部
の磁化状態を初期化させるための特定の直流、もしくは
交流の電流が通電可能であることを特徴とする回線電流
検出用電流検出器。1. A Hall element is installed in an air gap provided in a magnetic core, and a magnetic flux generated in the magnetic core is generated by a line current flowing through a coil wound around the magnetic core. In the current detector for detecting the output voltage as a line current value in the circuit section, the first coil portion wound around the magnetic core is for detecting the line current, and the measured current is The second coil portion, which is connected to the line through which the magnetic material flows, and which is wound around the magnetic core, can carry a specific direct current or alternating current for initializing the magnetized state inside the magnetic core. A current detector for detecting line current.
隙内に設置され、該磁性体コアに巻線されたコイル巻線
を流れる回線電流により、該磁性体コア内に発生する磁
束を該ホール素子にて検出し、その出力電圧を回路部に
て回線電流値として測定する電流検出器において、コイ
ル巻線の端子部にスイッチ回路を接続し、該スイッチ回
路によってコイル巻線を被測定回線、あるいは磁性体コ
アを初期化するための初期化用電流供給用の増幅器に切
り換え可能としたことを特徴とする回線電流検出用電流
検出器。2. A Hall element is installed in an air gap provided in a magnetic core, and a magnetic flux generated in the magnetic core is generated by a line current flowing through a coil winding wound around the magnetic core. In the current detector that detects the output voltage of the Hall element and measures the output voltage as the circuit current value in the circuit section, connect the switch circuit to the terminal section of the coil winding and use the switch circuit to measure the coil winding , Or a current detector for line current detection, which can be switched to an amplifier for supplying an initialization current for initializing the magnetic core.
は直流であって、前記磁性体コアを少なくともＢ−Ｈヒ
ステリシス曲線の飽和磁化状態まで推移させるのに必要
な電流値を通電した後、該電流値を零として磁性体コア
の磁化状態を常に同一極性に残留磁化を持つように初期
化することを特徴とする請求項１又は２記載の回線電流
検出用電流検出器。3. The current flowing for initializing the magnetic core is direct current, and after passing a current value necessary for causing the magnetic core to transit to at least the saturated magnetization state of the BH hysteresis curve. The current detector for line current detection according to claim 1 or 2, wherein the current value is set to zero, and the magnetization state of the magnetic core is initialized so as to always have the residual magnetization in the same polarity.
は交流であって、通電初期において、その起磁力が、前
記磁性体コアの磁化状態をＢ−Ｈヒステリシス曲線の飽
和状態まで交流電流を加えた後、徐々にその交流電流値
を減少させていき、ほぼ零の交流電流値まで減少させ
て、前記磁性体コアの磁化状態を残留磁化が零に近いほ
ぼ原点に初期化することを特徴とする請求項１又は２記
載の回線電流検出用電流検出器。4. The current for initializing the magnetized state of the magnetic core is an alternating current, and the magnetomotive force at the initial stage of energization changes the magnetized state of the magnetic core to the saturated state of the BH hysteresis curve. After that, the alternating current value is gradually reduced to an almost zero alternating current value, and the magnetization state of the magnetic core is initialized to the origin where the residual magnetization is close to zero. The line current detecting current detector according to claim 1 or 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20874493A JP3305445B2 (en) | 1993-07-30 | 1993-07-30 | Current detector for line current detection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20874493A JP3305445B2 (en) | 1993-07-30 | 1993-07-30 | Current detector for line current detection |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0743389A true JPH0743389A (en) | 1995-02-14 |
| JP3305445B2 JP3305445B2 (en) | 2002-07-22 |
Family
ID=16561368
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20874493A Expired - Fee Related JP3305445B2 (en) | 1993-07-30 | 1993-07-30 | Current detector for line current detection |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3305445B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002037131A1 (en) * | 2000-10-26 | 2002-05-10 | The Foundation : The Research Institute For Electric And Magnetic Materials | Thin-film magnetic field sensor |
| JP2003121522A (en) * | 2001-10-12 | 2003-04-23 | Res Inst Electric Magnetic Alloys | Thin-film magnetic field sensor |
| WO2012046537A1 (en) * | 2010-10-07 | 2012-04-12 | アルプス・グリーンデバイス株式会社 | Current sensor |
| JP2016532862A (en) * | 2013-07-15 | 2016-10-20 | 日本テキサス・インスツルメンツ株式会社 | Method and apparatus for demagnetizing a transformer core in a closed loop |
| CN112881939A (en) * | 2021-03-29 | 2021-06-01 | 赣南师范大学 | Computer line detects winding displacement ware |
-
1993
- 1993-07-30 JP JP20874493A patent/JP3305445B2/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002037131A1 (en) * | 2000-10-26 | 2002-05-10 | The Foundation : The Research Institute For Electric And Magnetic Materials | Thin-film magnetic field sensor |
| US6642714B2 (en) | 2000-10-26 | 2003-11-04 | The Research Institute For Electric And Magnetic Materials | Thin-film magnetic field sensor |
| JP2003121522A (en) * | 2001-10-12 | 2003-04-23 | Res Inst Electric Magnetic Alloys | Thin-film magnetic field sensor |
| WO2012046537A1 (en) * | 2010-10-07 | 2012-04-12 | アルプス・グリーンデバイス株式会社 | Current sensor |
| JP2016532862A (en) * | 2013-07-15 | 2016-10-20 | 日本テキサス・インスツルメンツ株式会社 | Method and apparatus for demagnetizing a transformer core in a closed loop |
| CN112881939A (en) * | 2021-03-29 | 2021-06-01 | 赣南师范大学 | Computer line detects winding displacement ware |
| CN112881939B (en) * | 2021-03-29 | 2023-06-27 | 赣南师范大学 | Computer circuit detects winding displacement ware |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3305445B2 (en) | 2002-07-22 |
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