JP2816175B2 - DC current measuring device - Google Patents
DC current measuring deviceInfo
- Publication number
- JP2816175B2 JP2816175B2 JP1107690A JP10769089A JP2816175B2 JP 2816175 B2 JP2816175 B2 JP 2816175B2 JP 1107690 A JP1107690 A JP 1107690A JP 10769089 A JP10769089 A JP 10769089A JP 2816175 B2 JP2816175 B2 JP 2816175B2
- Authority
- JP
- Japan
- Prior art keywords
- current
- frequency
- coil
- core
- capacitor
- 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.)
- Expired - Fee Related
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
- G01R15/183—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers using transformers with a magnetic core
Description
【発明の詳細な説明】 ［産業上の利用分野］ この発明は、例えば加速器の直流電流を測定する装置
に関するものである。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for measuring a direct current of an accelerator, for example.
［従来の技術］ 第２図は、例えば雑誌“ザ・シックスス・シンプ・オ
ン・アクセレレータ・サイエンス・アンド・テクノロジ
ー（The 6th Symp.on Accelerator Science and Techno
logy）”（1987年）第216ページに記載の従来の直流電
流測定装置を示す回路図である。図において、（１）は
例えば加速器（図示しない）から荷電粒子の直流電流の
向きを示している。（２）は高透磁率の複数個のドーナ
ッ状コア、（３）は各コア（２）に巻かれて、高周波電
流を流すことでコア（２）に高周波磁界を発生させるコ
イル、（４）はこれらコイル（３）の両端間に接続され
て例えば周波数ｆの高周波電流を供給する高周波電源で
ある。なお、この高周波電源（４）には直流カット用の
コンデンサおよび抵抗が図示のように直列に接続されて
いる。（５）は各コア（２）に巻かれてコア（２）内の
磁束の変化を測定するピックアップコイル、（６）はこ
れらピックアップコイル（５）の両端間に接続されてピ
ックアップコイル（５）でピックアップされた高周波の
第２高周波と高周波電源（４）から導出されて例えば2f
の周波数を有する基準信号との位相差を検出するための
位相差測定器例えばロックイン増幅器、（７）はこのロ
ックイン増幅器（６）の出力測に接続されて直流電流
（１）とは反対の方向に電流を流す打消しコイルであ
る。[Prior Art] FIG. 2 shows, for example, the magazine “The 6th Symp.on Accelerator Science and Technology”.
FIG. 2 is a circuit diagram showing a conventional DC current measuring apparatus described on page 216 of (1987), page 216. In the figure, (1) shows the direction of DC current of charged particles from, for example, an accelerator (not shown). (2) a plurality of donut-shaped cores having a high magnetic permeability, (3) a coil wound around each core (2) and generating a high-frequency magnetic field in the core (2) by flowing a high-frequency current, ( Reference numeral 4) denotes a high-frequency power supply connected between both ends of the coil 3 to supply a high-frequency current having a frequency f. The high-frequency power supply 4 has a DC cut capacitor and a resistor as shown in the figure. (5) is a pickup coil wound around each core (2) to measure a change in magnetic flux in the core (2), and (6) is provided between both ends of the pickup coil (5). Connected pickup coil (5 In it is derived from the second high-frequency and high-frequency power supply of picked-up radio frequency (4) for example 2f
A phase difference measuring device for detecting a phase difference from a reference signal having a frequency of, for example, a lock-in amplifier (7) is connected to the output measurement of the lock-in amplifier (6) and is opposite to the DC current (1). This is a canceling coil that allows current to flow in the direction of.
従来の直流電流測定装置は上述したように構成されて
おり、高周波電源（４）によってコイル（３）にはコア
（２）が飽和するのに十分な電流が流される。しかし、
コイル（３）の電流（交流）が小さい場合にはコア
（２）が飽和していないので、コイル（３）に流れる電
流に比例した磁束がコア（２）内に発生する。コイル電
流が大きくなつてコア（２）が飽和してしまうと、コア
（２）内の磁束は一定値になってしまう。ピックアップ
コイル（５）の出力は、コア（２）内の磁束の時間変化
に比例する。よって、出力はコア（２）が飽和していな
い場合にのみ電圧を出すパルス状となる。このパルス電
圧は、高周波の基本波および奇数次高周波成分からなっ
ている。こここで、コア（２）を鎖交するように荷電粒
子の直流電流（１）が流れた場合、コイル（３）の高周
波電流にバイアスがかかった状態になる。この時の出力
はパルス状ではあるが、偶数次高周波成分も含むように
なる。この偶数次高周波成分をロックイン増幅器（６）
で検出すると、第２高周波成分の電圧を検出することが
できる。この電圧に比例した電流をコア（２）に直流電
流（１）とは逆向きにコイル（７）に流して第２高周波
成分を０にするようにしたとする。この時打消しコイル
（７）に流れる電流値は直流電流（１）すなわち荷電粒
子の電流値に等しい。なお、コア（２）に高周波電流を
流すコイルを２個で逆向きにしかつピックアップコイル
（５）を同方向に巻いているのは基本波および奇数次高
周波成分を打消すためである。The conventional DC current measuring device is configured as described above, and a current sufficient to saturate the core (2) flows through the coil (3) by the high frequency power supply (4). But,
When the current (alternating current) of the coil (3) is small, the core (2) is not saturated, and a magnetic flux proportional to the current flowing through the coil (3) is generated in the core (2). If the core (2) saturates as the coil current increases, the magnetic flux in the core (2) becomes a constant value. The output of the pickup coil (5) is proportional to the time change of the magnetic flux in the core (2). Therefore, the output has a pulse shape that outputs a voltage only when the core (2) is not saturated. This pulse voltage is composed of a high-frequency fundamental wave and odd-order high-frequency components. Here, when the direct current (1) of the charged particles flows so as to link the core (2), the high-frequency current of the coil (3) is biased. Although the output at this time is in a pulse form, it includes even-order high-frequency components. Lock-in amplifier (6)
, The voltage of the second high-frequency component can be detected. It is assumed that a current proportional to this voltage is applied to the coil (7) in a direction opposite to the DC current (1) to the core (2) so that the second high-frequency component is set to zero. At this time, the current value flowing through the canceling coil (7) is equal to the DC current (1), that is, the current value of the charged particles. The reason why the two coils for passing the high-frequency current through the core (2) are reversed and the pickup coil (5) is wound in the same direction is to cancel the fundamental wave and the odd-order high-frequency components.
［発明が解決しようとする課題］ 従来の直流電流測定装置では、コアが飽和するのに十
分な高周波電流を流すためには大きな高周波電源が必要
だった。また、コアのヒステリシス損失などによるコア
の発熱が問題となっていた。[Problems to be Solved by the Invention] In the conventional DC current measuring device, a large high-frequency power supply was required to flow a high-frequency current sufficient for the core to be saturated. In addition, heat generation of the core due to hysteresis loss of the core has been a problem.
この発明は、上述したような問題点を解決するために
なされたもので、高周波電源を小型化でき、さらに測定
感度を良くした直流電流測定装置を得ることを目的とす
る。SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and has as its object to provide a DC current measuring device that can reduce the size of a high-frequency power supply and improve the measurement sensitivity.
［課題を解決するための手段］ この発明に係る直流電流測定装置は、少なくとも１個
のドーナツ状コアと、このコアに巻かれて、高周波電流
を流すことで前記コアに高周波磁界を発生させるコイル
と、このコイルに回路接続された共振用コンデンサと、
このコンデンサと直列に接続された電流測定用抵抗と、
これら抵抗、コンデンサおよびコイルから成る回路の両
端巻に接続され、前記コイルと前記コンデンサの共振状
態で前記高周波電流を供給する高周波電源と、前記抵抗
の両端間に接続されて前記高周波電源の２倍の周波数を
有する基準信号と抵抗の両端に現れる高周波電圧の間の
位相差を検出する位相差測定器とを備え、前記コアと鎖
交する直流電流を測定することを特徴とするものであ
る。[Means for Solving the Problems] A DC current measuring apparatus according to the present invention comprises a coil having at least one donut-shaped core wound around the core and flowing a high-frequency current to generate a high-frequency magnetic field in the core. And a resonance capacitor circuit-connected to the coil,
A current measuring resistor connected in series with the capacitor,
A high-frequency power supply connected to both ends of a circuit including the resistor, the capacitor, and the coil to supply the high-frequency current in a resonance state of the coil and the capacitor; And a phase difference measuring device for detecting a phase difference between a reference signal having a frequency of 1 and a high-frequency voltage appearing at both ends of the resistor, and measuring a DC current interlinked with the core.
［作 用］ この発明においては、コイルとコンデンサの共振状態
で高周波電源を動作させ、コンデンサと直列に接続され
ている抵抗に流れる高周波電流をモニタすることにより
コアと鎖交する直流電流を感度良く測定することができ
る。[Operation] In the present invention, a high-frequency power supply is operated in a resonance state of a coil and a capacitor, and a high-frequency current flowing through a resistor connected in series with the capacitor is monitored, so that a DC current linked to the core can be detected with high sensitivity. Can be measured.
［実施例］ 第１図はこの発明の直流電流測定装置による一実施例
を示す回路図である。第１図において、（８）はコア
（２）に巻かれたコイル（３）に回路接続、例えば図示
のように直列に接続された共振用コンデンサ、（９）は
このコンデンサ（８）と直列に接続された電流測定用抵
抗、（4A）はこれら抵抗（９）、コンデンサ（８）およ
びコイル（３）から成る直列回路の両端巻に接続され、
コイル（３）とコンデンサ（８）の共振状態で高周波電
流をコイル（３）に供給する小型の高周波電源、そして
（６）は抵抗（９）の両端巻に接続された位相差測定器
例えばロックイン増幅器である。[Embodiment] FIG. 1 is a circuit diagram showing an embodiment of a DC current measuring apparatus according to the present invention. In FIG. 1, (8) is a circuit connection to a coil (3) wound around a core (2), for example, a resonance capacitor connected in series as shown, and (9) is a series connection with this capacitor (8). Is connected to both ends of a series circuit consisting of the resistor (9), the capacitor (8) and the coil (3),
A small high-frequency power supply for supplying a high-frequency current to the coil (3) in a resonance state of the coil (3) and the capacitor (8), and (6) a phase difference measuring device connected to both ends of the resistor (9) such as a lock. In-amplifier.
上述したように構成されたこの発明の直流電流測定装
置では、コイル（３）のインダクタンスとコンデンサ
（８）のキャパシタンスとからもとまる共振周波数F0付
近で高周波電源（4A）を動作させるとする。この場合、
電源容量は小さくても共振状態になっているために大電
流をコア（２）に流すことができる。コア（２）が飽和
した場合、コア（２）の比透磁率は急激に下がるために
コア（２）のイピーダンスがほとんど０になる。このと
き、電源から見た回路の負荷が急激に小さくなるので、
パルス状の大電流が回路に流れることになる。この状態
でコア（２）に鎖交するように荷電粒子の直流電流が流
れた場合、従来例と同様にコイル（３）にバイアス電流
が流れた状態になる。このとき、バイアス電流と同方向
の必要とされる起磁力が変化することになる。すなわ
ち、バイアス電流と同方向の必要とされる起電力は小さ
くて済み、逆方向に必要とされる起磁力は大きくなる。
これにより、上記パルス状の大電流が発生する時間も変
化することになる。この時間の、周波数2f0の基準信号
に対するずれをロックイン増幅器（６）で測定すればコ
ア（２）に鎖交して流れる電流値を測定することができ
る。パルス状の大電流のシフトであるために位相検出は
非常に簡便となり、また非常に感度もよくなる。A DC current measuring device of this invention constructed as described above, and operating the high frequency power source (4A) in the vicinity of the resonance frequency F 0 that stops from the capacitance of the coil (3) inductance and a capacitor (8). in this case,
Even though the power supply capacity is small, a large current can flow through the core (2) because of the resonance state. When the core (2) is saturated, the relative permeability of the core (2) drops sharply, so that the impedance of the core (2) becomes almost zero. At this time, the load on the circuit as seen from the power supply suddenly decreases,
A large pulse-like current flows through the circuit. In this state, when a DC current of the charged particles flows so as to link the core (2), a bias current flows to the coil (3) as in the conventional example. At this time, the required magnetomotive force in the same direction as the bias current changes. That is, the required electromotive force in the same direction as the bias current is small, and the required magnetomotive force in the opposite direction is large.
As a result, the time during which the pulse-shaped large current is generated also changes. This time, it is possible to measure the current flowing interlinked core (2) is measured by displacement of the lock-in amplifier (6) with respect to a reference signal of frequency 2f 0. Because of the shift of the pulse-like large current, the phase detection is very simple and the sensitivity is also very good.
なお、上述した実施例では、ロックイン増幅器で第２
高周波成分の、基準信号に対する位相差を測定していた
が、偶数次高周波の測定であれば同様の効果が期待でき
る。また、ロックイン増幅器を用いなくても位相差を検
出できるものなら、どんなものでも同様の効果が期待で
きる。更に、第２図の打消しコイル（７）のような負帰
還を加えても同様の動作を期待できる。また、コンデン
サをコイルとに直列に接続していたが、並列に接続して
も同様の効果が期待できる。コアを２個以上用いても同
様の効果が期待できる。In the above-described embodiment, the second lock-in amplifier is used.
Although the phase difference of the high frequency component with respect to the reference signal has been measured, a similar effect can be expected if the measurement is of an even-order high frequency. Further, the same effect can be expected for any device that can detect the phase difference without using the lock-in amplifier. Further, the same operation can be expected by adding a negative feedback like the canceling coil (7) in FIG. Although the capacitor is connected in series with the coil, the same effect can be expected by connecting the capacitor in parallel. The same effect can be expected by using two or more cores.
［発明の効果］ 以上のように、この発明は、コアに巻かれたコイルに
回路接続された共振用コンデンサと、このコンデンサと
直列に接続された電流測定用抵抗と、これら抵抗、コン
デンサおよびコイルから成る回路の両端巻に接続され、
コイルとコンデンサの共振状態で高周波電流を供給する
高周波電源と、抵抗の溜譚巻に接続されて基準信号に対
する高周波の位相差を検出する位相差測定器とを設け、
コイルとコンデンサの共振状態を利用して荷電粒子の電
流値を測定することにより、精度および感度の良い測定
が容易に可能となる効果を奏する。[Effect of the Invention] As described above, the present invention provides a resonance capacitor circuit-connected to a coil wound around a core, a current measuring resistor connected in series with the capacitor, and a resistor, a capacitor, and a coil. Connected to both ends of a circuit consisting of
A high-frequency power supply that supplies a high-frequency current in a resonance state of the coil and the capacitor, and a phase difference measuring device that is connected to a resistor winding and detects a high-frequency phase difference with respect to a reference signal are provided.
By measuring the current value of the charged particles using the resonance state of the coil and the capacitor, there is an effect that measurement with high accuracy and sensitivity can be easily performed.
第１図はこの発明の一実施例を示す回路図、そして第２
図は従来の直流電流測定装置を示す回路図である。 図において、（１）は荷電粒子の直流電流、（２）はコ
ア、（３）はコイル、（4A）は高周波電源、（６）はロ
ックイン増幅器。FIG. 1 is a circuit diagram showing an embodiment of the present invention, and FIG.
FIG. 1 is a circuit diagram showing a conventional DC current measuring device. In the figure, (1) is a DC current of charged particles, (2) is a core, (3) is a coil, (4A) is a high frequency power supply, and (6) is a lock-in amplifier.
Claims (1)
コアに巻かれて、高周波電流を流すことで前記コアに高
周波磁界を発生させるコイルと、このコイルに回路接続
された共振用コンデンサと、このコンデンサと直列に接
続された電流測定用抵抗と、これら抵抗、コンデンサお
よびコイルから成る回路の両端間に接続され、前記コイ
ルと前記コンデンサの共振状態で前記高周波電流を供給
する高周波電源と、前記抵抗の両端間に接続されて、前
記高周波電源の２倍の周波数を有する基準信号と前記抵
抗の両端間に現れる高周波電圧の位相差を検出する位相
差測定器とを備え、前記コアと鎖交する直流電流を測定
することを特徴とする直流電流測定装置。An at least one donut-shaped core, a coil wound around the core to generate a high-frequency magnetic field in the core by passing a high-frequency current, a resonance capacitor circuit-connected to the coil, A current measuring resistor connected in series with the capacitor, a high-frequency power supply connected between both ends of a circuit including the resistor, the capacitor, and the coil to supply the high-frequency current in a resonance state of the coil and the capacitor; A phase difference measuring device connected between both ends of the resistor and detecting a phase difference between a reference signal having a frequency twice as high as that of the high frequency power supply and a high frequency voltage appearing between both ends of the resistor; A direct current measuring device for measuring a direct current to be applied.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1107690A JP2816175B2 (en) | 1989-04-28 | 1989-04-28 | DC current measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1107690A JP2816175B2 (en) | 1989-04-28 | 1989-04-28 | DC current measuring device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02287266A JPH02287266A (en) | 1990-11-27 |
| JP2816175B2 true JP2816175B2 (en) | 1998-10-27 |
Family
ID=14465495
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1107690A Expired - Fee Related JP2816175B2 (en) | 1989-04-28 | 1989-04-28 | DC current measuring device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2816175B2 (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW534999B (en) | 1998-12-15 | 2003-06-01 | Tdk Corp | Magnetic sensor apparatus and current sensor apparatus |
| FR2919064B1 (en) | 2007-07-19 | 2009-10-02 | Biomerieux Sa | METHOD OF ASSAYING APOLIPOPROTEIN ALL FOR IN VITRO DIAGNOSIS OF COLORECTAL CANCER |
| FR2919065B1 (en) | 2007-07-19 | 2009-10-02 | Biomerieux Sa | METHOD FOR DETERMINING APOLIPOPROTEIN AI FOR IN VITRO DIAGNOSIS OF COLORECTAL CANCER |
| FR2919063B1 (en) | 2007-07-19 | 2009-10-02 | Biomerieux Sa | METHOD OF DETERMINING LEUCOCYTE ELASTASE INHIBITOR FOR IN VITRO DIAGNOSIS OF COLORECTAL CANCER. |
| FR2919061B1 (en) | 2007-07-19 | 2009-10-02 | Biomerieux Sa | METHOD OF DOSING PLASTINE-I FOR IN VITRO DIAGNOSIS OF COLORECTAL CANCER. |
| FR2919068B1 (en) * | 2007-07-19 | 2009-09-18 | Airbus France Sa | PERFECTED CURRENT SENSOR |
| FR2919062B1 (en) | 2007-07-19 | 2009-10-02 | Biomerieux Sa | METHOD OF DETERMINING AMINOACYLASE 1 FOR IN VITRO DIAGNOSIS OF COLORECTAL CANCER. |
| US9726670B2 (en) | 2007-07-19 | 2017-08-08 | Biomerieux | Method for the assay of liver fatty acid binding protein, ACE and CA 19-9 for the in vitro diagnosis of colorectal cancer |
| FR2919060B1 (en) | 2007-07-19 | 2012-11-30 | Biomerieux Sa | METHOD OF DETERMINING EZRINE FOR IN VITRO DIAGNOSIS OF COLORECTAL CANCER |
| EP2251704A1 (en) * | 2009-05-11 | 2010-11-17 | Liaisons Electroniques-Mecaniques Lem S.A. | Closed-loop fluxgate current sensor |
| IES20100604A2 (en) | 2010-09-21 | 2011-06-08 | Shakira Ltd | DC & AC current detection circuit |
| JP6166319B2 (en) * | 2015-09-17 | 2017-07-19 | 株式会社中央製作所 | Non-contact type DC current sensor and DC current measuring system using the non-contact type DC current sensor |
-
1989
- 1989-04-28 JP JP1107690A patent/JP2816175B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02287266A (en) | 1990-11-27 |
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