JPS58158558A - Current detection circuit - Google Patents
Current detection circuitInfo
- Publication number
- JPS58158558A JPS58158558A JP57043537A JP4353782A JPS58158558A JP S58158558 A JPS58158558 A JP S58158558A JP 57043537 A JP57043537 A JP 57043537A JP 4353782 A JP4353782 A JP 4353782A JP S58158558 A JPS58158558 A JP S58158558A
- Authority
- JP
- Japan
- Prior art keywords
- receiving side
- voltage
- load resistance
- resistance
- current detection
- 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)
Abstract
Description
【発明の詳細な説明】
この発明は直流電流変成器（以下、ＤＣＣＴと呼ぶ）を
使用した電流検出回路に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a current detection circuit using a direct current transformer (hereinafter referred to as DCCT).
ＤＣＣＴを使用した電流検出回路の従来の構成を第１図
に示す。第７図において、被測定直流母線／に取付けら
れたＤＣＣＴの検出コイルコおよび３、ＤＣＣＴ入力電
入力電源波用ダイオードＳ、鶴７９ｇ。A conventional configuration of a current detection circuit using a DCCT is shown in FIG. In FIG. 7, a DCCT detection coil 3 attached to the DC bus to be measured, a diode S for DCCT input power input power wave, and a crane 79g.
および負担抵抗９で構成されたＤＣＣ’Ｉ’の検出信号
発信側／弘より、該負担抵抗デの検出電圧を伝送線／θ
を通して受信側ｌＳの演算増幅器１３の入力インピーダ
ンス／／ｊこ入力して制御信号として取出ス。インピー
ダンス／２は演算増幅器／３の帰還インピーダンスであ
る。From the detection signal sending side /Hiro of DCC 'I' which is composed of a burden resistor 9, the detection voltage of the burden resistor D is connected to a transmission line /θ
The input impedance of the operational amplifier 13 on the receiving side IS is inputted through the input impedance and taken out as a control signal. Impedance /2 is the feedback impedance of operational amplifier /3.
このような従来の電流検出回路の構成において。In such a conventional current detection circuit configuration.
この電流検出回路を、例えば非常に精度の高いものが必
要とされる核融合電源に使用する場合には、周囲に大き
なノイズ源を発生する機器が多くあるためしばしば電界
お、よび磁界による誘導ノイズを受け、適切な制御を行
うことが困難であった。％に、伝送線ｌＯが非常番こ長
い場合には周囲の影響を一層受けやすくなる。When this current detection circuit is used, for example, in a nuclear fusion power source that requires extremely high precision, there are many devices that generate large noise sources in the surrounding area, so it is often caused by induced noise due to electric and magnetic fields. This made it difficult to carry out appropriate control. %, if the transmission line IO is very long, it will be more susceptible to the influence of the surroundings.
この発明は上記の如き従来の欠点を除去するために為さ
れたもので、ＤＣＣＴの負担抵抗を信号の受信側／りへ
も取付ける事により耐ノイズ性を向上させ高精度の制御
を経済的に行なわしめる電流検出回路を提供するもので
ある。This invention was made to eliminate the above-mentioned drawbacks of the conventional technology, and by attaching the burden resistance of the DCCT to the signal receiving side, it improves noise resistance and enables high-precision control economically. The present invention provides a current detection circuit that performs this operation.
以下、第一図をこ基づいてこの発明の一実施例を説明す
る。第２図においては、第１図に示された負担抵抗ワは
、発信側／４１の負担抵抗９ａと受信狽ｌｌＳの負担抵
抗９ｂと１こ分割配置して示されているが、他の構成は
第１図と同様なので説明を省略する。負担抵抗ｑａと負
担抵抗ｑｂとは並列回路を構成しその並列抵抗値は第１
図の負担抵抗ワの値と同じとする。An embodiment of the present invention will be described below with reference to FIG. In FIG. 2, the burden resistance shown in FIG. 1 is shown divided into one burden resistance 9a on the transmitting side/41 and one burden resistance 9b on the reception side, but other configurations may be used. Since it is the same as that in FIG. 1, the explanation will be omitted. The burden resistance qa and the burden resistance qb constitute a parallel circuit, and the parallel resistance value is the first
It is assumed that the value is the same as the value of burden resistance Wa in the figure.
このような構成において、直流母線／に流れる直流ｉｔ
流に比例した電流は負担抵抗９ａおよび９ｂに分流する
がその端子電圧、すなわち負担抵抗？ｂの両端電圧が検
出電圧値となり、演算増幅器／３の入力インピーダンス
／／へ入力されて制御に使用されることになる。ここで
受信側ｌ！ｆの負担抵抗９ｂの値をＤＣＣＴ側負担抵抗
？ａの値よりも小さくすれば、受信側における耐ノイズ
性は向上する。これはノイズ電圧が侵入してくる経路の
インピーダンスに比べて受信すべき負荷インピーダンス
値を小さくすれば耐ノイズ性が向上するという原理にも
とづくものである。ＤＣＣ’Ｔ側負担抵抗９ａは伝送線
／θが切断不良を生じた時、その出力に発生する異常・
電圧でＤＣＣＴの検出コイルスおよび３が絶縁破壊する
ような値よりは小さくする必要がある。しかしこの電圧
が小さければ負担抵抗９ａは特に必要ではない。In such a configuration, the DC it flowing to the DC bus/
The current proportional to the current is divided into the burden resistances 9a and 9b, but the terminal voltage, that is, the burden resistance? The voltage across b becomes the detected voltage value, which is input to the input impedance // of operational amplifier /3 and used for control. Here, the receiving side l! Is the value of the burden resistance 9b of f the DCCT side burden resistance? If the value of a is smaller than the value of a, the noise resistance on the receiving side will be improved. This is based on the principle that noise resistance is improved by making the load impedance value to be received smaller than the impedance of the path through which the noise voltage enters. The resistance 9a on the DCC'T side is used to prevent abnormalities that occur in the output when the transmission line /θ is disconnected.
The voltage needs to be smaller than a value that would cause dielectric breakdown of the DCCT detection coils and 3. However, if this voltage is small, the burden resistor 9a is not particularly necessary.
以上の如くこの発明ｌこよＩｔばＤＣＣ′１゛の負担抵
抗を分割し伝送線路でへだてられた受信側にも入れるこ
とにより、伝送線より受けるノイズ電圧に影響されるこ
とのない高精度の電流検出を経済的に行うことができる
という効果がある。As described above, this invention allows for a highly accurate current that is not affected by noise voltage received from the transmission line by dividing the load resistance of the DCC'1 and introducing it into the receiving side separated by the transmission line. This has the effect that detection can be performed economically.
第１図は従来の電流検出回路を示す回路構成図、第一図
はこの発明の一実施例による電流検出回路を示す回路構
成図である。図において、／は直流母線、ユおよび３は
ＤＣＣＴの検出コイル、グはＤＣＣＴ入力電源、ヲａお
よびｑｂは負担抵抗、１０は伝送線、／４’は送信側、
１５は受信側である。
代理人 葛 野 信 −FIG. 1 is a circuit configuration diagram showing a conventional current detection circuit, and FIG. 1 is a circuit configuration diagram showing a current detection circuit according to an embodiment of the present invention. In the figure, / is the DC bus, Y and 3 are the DCCT detection coils, G is the DCCT input power supply, woa and qb are the load resistances, 10 is the transmission line, /4' is the transmitting side,
15 is the receiving side. Agent Shin Kuzuno −
Claims (1)
抗で受け、この負担抵抗の両端電圧を伝送線にて受信側
に伝送するようにした電流検出回路において、前記負担
抵抗を前記受信側に挿入するようにしたことを％徴とす
る電流検出回路。 （２） 前記伝送線の断線時の保護を必要とする場合
には、前記負担抵抗を前記発信側と前記受信側とに分割
して設けるようにした特許請求の範囲第１項記載の電流
検出回路。[Claims] +11 In a current detection circuit in which the output of a current detection coil is received by a burden resistor on the transmitting side, and the voltage across the burden resistor is transmitted to the receiving side via a transmission line, the burden resistor is A current detection circuit characterized by being inserted into the receiving side. (2) The current detection according to claim 1, wherein when protection is required in the event of a disconnection of the transmission line, the burden resistor is provided separately for the transmitting side and the receiving side. circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57043537A JPS58158558A (en) | 1982-03-15 | 1982-03-15 | Current detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57043537A JPS58158558A (en) | 1982-03-15 | 1982-03-15 | Current detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS58158558A true JPS58158558A (en) | 1983-09-20 |
Family
ID=12666484
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57043537A Pending JPS58158558A (en) | 1982-03-15 | 1982-03-15 | Current detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58158558A (en) |
-
1982
- 1982-03-15 JP JP57043537A patent/JPS58158558A/en active Pending
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