JPH0653061A - Direct-current transformer - Google Patents
Direct-current transformerInfo
- Publication number
- JPH0653061A JPH0653061A JP4064915A JP6491592A JPH0653061A JP H0653061 A JPH0653061 A JP H0653061A JP 4064915 A JP4064915 A JP 4064915A JP 6491592 A JP6491592 A JP 6491592A JP H0653061 A JPH0653061 A JP H0653061A
- Authority
- JP
- Japan
- Prior art keywords
- core
- belt
- current transformer
- current
- spring
- 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
Links
Landscapes
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
- Transformers For Measuring Instruments (AREA)
- Dc-Dc Converters (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は直流変流器に関し、特
に、ホール素子を用いたものの改良に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a DC current transformer, and more particularly to improvement of a DC current transformer.
【０００２】[0002]
【従来の技術】本発明の直流変流器は本願出願人の既出
願である実願昭６３−２２５８号（以下先願という）の
改良に関するものであり、はじめに先願について概略を
説明する。2. Description of the Related Art A DC current transformer according to the present invention relates to an improvement of Japanese Patent Application No. 63-2258 (hereinafter referred to as a prior application), which has been filed by the applicant of the present application. First, the outline of the prior application will be described.
【０００３】図２はコア部分の電気的回路図である。図
２において、１０は一対の空隙１１，１２を有する環状
のコアで、両空隙はコア上において点対称位置に形成さ
れている。２１，２２はそれぞれ空隙１１と１２内に配
置された特性の揃ったホール素子、３１，３２はコア１
１，１２に巻装された１次，２次巻線である。FIG. 2 is an electric circuit diagram of the core portion. In FIG. 2, reference numeral 10 is an annular core having a pair of voids 11 and 12, and both voids are formed at point symmetrical positions on the core. Reference numerals 21 and 22 denote Hall elements arranged in the voids 11 and 12, respectively, having uniform characteristics. Reference numerals 31 and 32 denote cores 1.
The primary and secondary windings are wound around 1 and 12.
【０００４】図３は電気回路部分の接続図である。図３
において、１０は図２に示したコア、２１，２２は同じ
くホール素子、３１，３２は１次，２次巻線、４１，４
２は演算増幅器、５１，５２は定電流源、６０は加算増
幅器である。該加算増幅器６０の出力端子はコア１０に
巻嵌された２次巻線３２を介して出力端子７０に接続さ
れている。ホール素子２１，２２の電流端子は演算増幅
器４１，４２の出力端子と定電流源５１，５２に接続さ
れ、電圧端子は演算増幅器４１，４２の入力端子と抵抗
素子６１，６２を介して加算増幅器６０に接続されてい
る。FIG. 3 is a connection diagram of an electric circuit portion. Figure 3
2, 10 is the core shown in FIG. 2, 21 and 22 are also Hall elements, 31 and 32 are primary and secondary windings, and 41 and 4
2 is an operational amplifier, 51 and 52 are constant current sources, and 60 is a summing amplifier. The output terminal of the summing amplifier 60 is connected to the output terminal 70 via the secondary winding 32 wound around the core 10. The current terminals of the Hall elements 21 and 22 are connected to the output terminals of the operational amplifiers 41 and 42 and the constant current sources 51 and 52, and the voltage terminals thereof are connected to the input terminals of the operational amplifiers 41 and 42 and the resistance elements 61 and 62. It is connected to 60.
【０００５】このような構成に係わる直流変流器におい
て、１次巻線３１に電流ｉ１を供給することにより発生
する磁束は、図２の矢印で示すようにコア１０を一巡す
るように通る。該磁束により、定電流源５１，５２によ
って定電流が供給されているホール素子２１，２２は電
流ｉ１に対応した電圧をその電圧端子に発生する。発生
した電圧はそれぞれ演算増幅器４１，４２に加えられ、
その演算増幅器４１，４２のシングルエンド出力は加算
増幅器６０で加算される。加算増幅器６０の出力は２次
巻線３２に供給され、該２次巻線３２には電流ｉ２が流
れる。該電流ｉ２によってコア１０に発生した磁束は図
２の矢印方向の磁束を打ち消すようにコア１０を一巡す
る。加算増幅器６０は、該増幅器の出力であるホール素
子２１，２２の出力電圧の加算値が零になるように電流
ｉ２の値を制御する。加算増幅器６０の出力が零になっ
たときの２次電流ｉ２は１次電流ｉ１に対応したもの
で、出力端子７０より計測される。In the DC current transformer having such a structure, the magnetic flux generated by supplying the current i1 to the primary winding 31 passes through the core 10 as shown by the arrow in FIG. Due to the magnetic flux, the Hall elements 21, 22 to which the constant currents are supplied by the constant current sources 51, 52 generate a voltage corresponding to the current i1 at their voltage terminals. The generated voltage is applied to the operational amplifiers 41 and 42,
The single-ended outputs of the operational amplifiers 41 and 42 are added by the adding amplifier 60. The output of the summing amplifier 60 is supplied to the secondary winding 32, and the current i2 flows through the secondary winding 32. The magnetic flux generated in the core 10 by the current i2 goes around the core 10 so as to cancel the magnetic flux in the direction of the arrow in FIG. The adding amplifier 60 controls the value of the current i2 so that the added value of the output voltages of the Hall elements 21 and 22 which is the output of the adding amplifier 60 becomes zero. The secondary current i2 when the output of the summing amplifier 60 becomes zero corresponds to the primary current i1 and is measured from the output terminal 70.
【０００６】このような構成の直流変流器においては、
コア１０に外部磁界が加わっても、該外部磁界によりコ
ア１０内に生じる磁束の向きは互いに逆向きとなる。そ
の結果、外部磁界によってホール素子２１，２２に生じ
る電圧は逆向きとなり、その逆極性電圧は図３に示す加
算増幅器６０に加えられて互いに打ち消される。そのた
め、加算増幅器６０の出力は外部磁界による影響はなく
なり、２次電流ｉ２は正確に１次電流ｉ１に対応すると
いう特徴がある。In the DC current transformer having such a structure,
Even if an external magnetic field is applied to the core 10, the directions of the magnetic fluxes generated in the core 10 by the external magnetic field are opposite to each other. As a result, the voltages generated in the Hall elements 21 and 22 due to the external magnetic field have opposite directions, and the reverse polarity voltages are applied to the summing amplifier 60 shown in FIG. 3 and cancel each other out. Therefore, the output of the summing amplifier 60 is not affected by the external magnetic field, and the secondary current i2 has a characteristic that it accurately corresponds to the primary current i1.
【０００７】図４は上述先願の具体的な構成図である。
図４において、１０はコアで、該コアは１次，２次巻線
の巻き回しが容易になるように長方形状の輪になってお
り、空隙１１，１２を作るため、その長手方向と垂直な
面でカットされる。ホール素子２１，２２は２枚の方形
状のフェライト板の積み合わせ部分に磁気検出体を挾み
込んで構成したもので、切断後のコアの一方の面に接着
剤等で固定し、コアの他方の面で挾み込む構造となって
いる。更にこれを固定，保持するため、コアの外周に沿
って薄板状のベルト４４が周回されている。ベルト４４
の一端にはネジ穴４８を貫通させたブロック４５が溶接
あるいは半田付等で固定され、他端にはネジ穴４８より
大きい丸穴４９を貫通させたブロック４６が固定されて
いる。締結用のネジ４７をブロック４５，４６の丸穴４
９を貫通させながらネジ穴４８に締結することによって
コア１０とホール素子２１，２２の保持がなされる。な
お、４１，４２はホール素子２１，２２の電圧入出力，
電源供給に用いるリード線を示すもので、フレキシブル
プリント板４３の先端部に半田付けされ、ホール素子２
１，２２の入出力等はこのフレキシブルプリント板４３
を通して行われる。フレキシブルプリント板４３自体は
コア１０に接着剤等で張り付けられる。FIG. 4 is a concrete configuration diagram of the above-mentioned prior application.
In FIG. 4, reference numeral 10 denotes a core, which is a rectangular ring for facilitating the winding of the primary and secondary windings. It is cut in various ways. The Hall elements 21 and 22 are formed by sandwiching a magnetic detection body in a stacked portion of two rectangular ferrite plates, and are fixed to one surface of the core after cutting with an adhesive or the like to The structure is such that the other side is sandwiched. Further, in order to fix and hold this, a thin plate-shaped belt 44 is wound around the outer periphery of the core. Belt 44
A block 45 having a screw hole 48 penetrating therethrough is fixed by welding, soldering or the like, and a block 46 having a round hole 49 larger than the screw hole 48 penetrating is fixed at the other end. Screw 47 for fastening the round holes 4 of blocks 45, 46
The core 10 and the Hall elements 21 and 22 are held by fastening them to the screw holes 48 while penetrating 9. 41 and 42 are voltage inputs and outputs of the Hall elements 21 and 22,
The lead wire used for power supply is shown in FIG.
The flexible printed board 43 is used for the input / output of 1, 22 and the like.
Done through. The flexible printed board 43 itself is attached to the core 10 with an adhesive or the like.
【０００８】[0008]
【発明が解決しようとする課題】しかしながら、このよ
うな先願の構成によれば、コア１０とホール素子２１，
２２間の接着面が必ずしも平坦にならないという問題が
ある。However, according to the structure of the prior application, the core 10 and the Hall element 21,
There is a problem that the adhesive surface between the 22 is not necessarily flat.
【０００９】また、ベルト４４の厚さ及びベルトを締結
するネジ４７の締め付けトルクによっては図５のように
コア１０の４隅に集中的に力が加わって歪みが生じてし
まうという問題もある。Further, depending on the thickness of the belt 44 and the tightening torque of the screw 47 for fastening the belt, a force is intensively applied to the four corners of the core 10 as shown in FIG.
【００１０】これらいずれの場合にも、コア１０の切断
面に均一に力が加わらなくなり、ホール素子２１，２２
について安定した電気的特性が得られない。本発明は、
このような従来の問題点に鑑みてなされたものであり、
その目的は、温度等の環境変化があってもコアの切断面
に常に均一な力が加わるようにし、ホール素子から安定
した電気的特性が得られるようにした直流変流器を提供
することにある。In any of these cases, the force is not evenly applied to the cut surface of the core 10, and the Hall elements 21, 22
No stable electrical characteristics can be obtained. The present invention is
It was made in view of such conventional problems,
Its purpose is to provide a DC current transformer in which a uniform force is always applied to the cut surface of the core even if the environment changes such as temperature, and stable electric characteristics can be obtained from the Hall element. is there.
【００１１】[0011]
【課題を解決するための手段】本発明に係る直流変流器
は、１次及び２次巻線が巻回されると共に点対称となる
ように形成された一対の空隙内にホール素子が配置され
てなる環状のコアと、前記一対のホール素子の出力電圧
を加算し前記１次巻線によってコアに生じる磁束を打ち
消す方向の磁束がこのコアに発生するように前記２次巻
線に電流を供給する加算増幅器よりなる直流変流器にお
いて、前記コアの外周に沿って板状のベルトを周回さ
せ、該ベルトの両端を所定のバネ定数を有するバネで連
結固定したことを特徴とするものである。In a DC current transformer according to the present invention, a Hall element is arranged in a pair of air gaps formed so that primary and secondary windings are wound and are point-symmetrical. A current is supplied to the secondary winding so that a magnetic flux in a direction in which the output voltages of the pair of Hall elements are added to each other and the magnetic flux generated in the core by the primary winding is canceled is generated in this core. In a DC current transformer comprising a supply amplifier for supplying, a plate-shaped belt is circulated along the outer periphery of the core, and both ends of the belt are connected and fixed by springs having a predetermined spring constant. is there.
【００１２】[0012]
【作用】コアとホール素子は、所定のバネ定数を有する
バネにより、常に一定の力で連結固定される。The core and the Hall element are always connected and fixed with a constant force by a spring having a predetermined spring constant.
【００１３】従って、部品のバラツキに起因する組み立
て後の特性のバラツキは小さくなり、安定した特性が得
られる。Therefore, variations in characteristics after assembly due to variations in parts are reduced, and stable characteristics can be obtained.
【００１４】[0014]
【実施例】以下、図面を参照して、本発明の実施例を詳
細に説明する。図１は本発明の一実施例の構成図であ
り、図４と共通する部分には図４と同一の符号を付けて
それらの再説明は省略する。図１において、５１は板状
のベルトで、ホール素子２１，２２をコア１０の切断面
で挾み込み、接着剤等の緩衝部材を介在させることなく
固定，保持するためにコア１０の外周に沿って周回され
ている。ベルト５１の両端には係止穴を有するブロック
５２，５３が設けられている。なお、ベルト５１として
は、コア１０の４隅に無理な力が加わらないような厚さ
のものを用いる。また、コア１０の切断面の平坦度は従
来よりも高くしておく。５４は所定のバネ定数を有する
バネであり、ベルト５１の両端のブロック５２，５３の
係止穴に係止される。５５は磁石であり、ホール素子２
１，２２のリード線４１，４２をフレキシブルプリント
板４３に半田付けするのにあたって固定するために用い
る。Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a configuration diagram of an embodiment of the present invention, and portions common to FIG. 4 are assigned the same reference numerals as those in FIG. 4 and their re-explanation is omitted. In FIG. 1, reference numeral 51 denotes a plate-shaped belt, which is placed on the outer periphery of the core 10 so that the Hall elements 21 and 22 are sandwiched by the cut surface of the core 10 and fixed and held without a buffer member such as an adhesive. It is orbited along. Blocks 52 and 53 having locking holes are provided at both ends of the belt 51. As the belt 51, a belt having a thickness that does not apply unreasonable force to the four corners of the core 10 is used. Further, the flatness of the cut surface of the core 10 is set higher than in the past. Reference numeral 54 is a spring having a predetermined spring constant, which is locked in the locking holes of the blocks 52 and 53 at both ends of the belt 51. 55 is a magnet, and the Hall element 2
It is used for fixing the lead wires 41 and 42 of 1, 22 to the flexible printed board 43 when soldering them.
【００１５】このように構成される直流変流器は、コア
１０とホール素子２１，２２の間に接着剤等の緩衝部材
を介在させていないので組み立て後の調整が簡略化で
き、１回の調整で所望の特性が得られる合格率は、従来
の６９％から９１％に改善された。In the DC current transformer constructed as described above, since a buffer member such as an adhesive is not interposed between the core 10 and the Hall elements 21 and 22, the adjustment after assembling can be simplified and the one-time operation can be performed only once. The pass rate at which the desired characteristics were obtained by adjustment was improved from 69% in the past to 91%.
【００１６】また、ネジ止めに起因すると推測できるホ
ール素子が使用不可能になる発生率も従来の３０％前後
から５％以下に改善された。特に、ベルト５１をバネ定
数が管理されたバネ５４で連結固定しているので、温度
等の環境変化があってもコア１０には常に一定の力が加
わることになり、直流変流器の精度を大きく左右するコ
ア１０とホール素子２１，２２間の空隙が小さくなり、
安定した特性が得られる。Further, the occurrence rate at which the Hall element, which can be presumed to be caused by screwing, becomes unusable is also improved from about 30% in the past to 5% or less. In particular, since the belt 51 is connected and fixed by the spring 54 whose spring constant is controlled, a constant force is always applied to the core 10 even if the environment such as temperature changes, and the accuracy of the DC current transformer is improved. The gap between the core 10 and the Hall elements 21, 22 that greatly influences the
Stable characteristics can be obtained.
【００１７】[0017]
【発明の効果】以上説明した本発明によれば、コアの外
周に周回されたベルトをバネ定数が規定されているバネ
で連結固定しているので、特性の安定した直流変流器を
提供できる。According to the present invention described above, the belt wound around the outer periphery of the core is connected and fixed by the spring having the specified spring constant, so that a DC current transformer having stable characteristics can be provided. .
【図１】本発明の一実施例のコア部分の構成図である。FIG. 1 is a configuration diagram of a core portion according to an embodiment of the present invention.
【図２】本発明に係わる直流変流器のコア部分の電気的
回路図である。FIG. 2 is an electric circuit diagram of a core portion of a DC current transformer according to the present invention.
【図３】本発明に係わる直流変流器の全体回路の接続図
である。FIG. 3 is a connection diagram of an entire circuit of a DC current transformer according to the present invention.
【図４】先願のコア部分の構成図である。FIG. 4 is a configuration diagram of a core portion of the prior application.
【図５】先願のコア部分の変化説明図である。FIG. 5 is an explanatory diagram of changes in the core portion of the prior application.
１０ コア ２１，２２ ホール素子 ５１ ベルト ５２，５３ ブロック ５４ バネ 10 core 21,22 hall element 51 belt 52,53 block 54 spring
Claims (1)
対称となるように形成された一対の空隙内にホール素子
が配置されてなる環状のコアと、前記一対のホール素子
の出力電圧を加算し前記１次巻線によってコアに生じる
磁束を打ち消す方向の磁束がこのコアに発生するように
前記２次巻線に電流を供給する加算増幅器よりなる直流
変流器において、 前記コアの外周に沿って板状のベルトを周回させ、該ベ
ルトの両端を所定のバネ定数を有するバネで連結固定し
たことを特徴とする直流変流器。1. An annular core, in which primary and secondary windings are wound and a hall element is disposed in a pair of air gaps formed in point symmetry, and a pair of the hall elements. A DC current transformer comprising a summing amplifier that supplies a current to the secondary winding so that a magnetic flux in a direction that cancels the magnetic flux generated in the core by the primary winding is added to the output transformer, A DC current transformer, characterized in that a plate-shaped belt is wound around the outer periphery of the belt, and both ends of the belt are connected and fixed by springs having a predetermined spring constant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4064915A JPH0653061A (en) | 1992-03-23 | 1992-03-23 | Direct-current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4064915A JPH0653061A (en) | 1992-03-23 | 1992-03-23 | Direct-current transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0653061A true JPH0653061A (en) | 1994-02-25 |
Family
ID=13271826
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4064915A Pending JPH0653061A (en) | 1992-03-23 | 1992-03-23 | Direct-current transformer |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0653061A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003043073A (en) * | 2001-07-26 | 2003-02-13 | Hioki Ee Corp | Cramp sensor |
| JP2007033303A (en) * | 2005-07-28 | 2007-02-08 | Mitsubishi Electric Corp | Electric current detector |
| KR100877450B1 (en) * | 2007-10-10 | 2009-01-07 | 김장수 | Split shape closed loop current transducer |
| JP2012098205A (en) * | 2010-11-04 | 2012-05-24 | Fujitsu Ltd | Current measurement method and magnetic sensor device |
-
1992
- 1992-03-23 JP JP4064915A patent/JPH0653061A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003043073A (en) * | 2001-07-26 | 2003-02-13 | Hioki Ee Corp | Cramp sensor |
| JP2007033303A (en) * | 2005-07-28 | 2007-02-08 | Mitsubishi Electric Corp | Electric current detector |
| KR100877450B1 (en) * | 2007-10-10 | 2009-01-07 | 김장수 | Split shape closed loop current transducer |
| WO2009048198A1 (en) * | 2007-10-10 | 2009-04-16 | Jang-Soo Kim | Split shape closed loop current transducer |
| JP2011501405A (en) * | 2007-10-10 | 2011-01-06 | キム，チャン−ス | Closed circuit current modifier with through-opening / closing structure |
| JP2012098205A (en) * | 2010-11-04 | 2012-05-24 | Fujitsu Ltd | Current measurement method and magnetic sensor device |
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