JPH07110347A - Direct current measuring device - Google Patents
Direct current measuring deviceInfo
- Publication number
- JPH07110347A JPH07110347A JP5277705A JP27770593A JPH07110347A JP H07110347 A JPH07110347 A JP H07110347A JP 5277705 A JP5277705 A JP 5277705A JP 27770593 A JP27770593 A JP 27770593A JP H07110347 A JPH07110347 A JP H07110347A
- Authority
- JP
- Japan
- Prior art keywords
- current
- current measuring
- measuring device
- photocoupler
- shunt
- 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.)
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Links
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- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
- Measurement Of Current Or Voltage (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、被測定回路に流れる電
流を測定する直流電流計測器に関し、特に、絶縁型の直
流電流計測器の構造に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a direct current measuring instrument for measuring a current flowing through a circuit to be measured, and more particularly to a structure of an insulation type direct current measuring instrument.
【０００２】[0002]
【従来の技術】従来、この種の直流電流計測器として、
図５に示すような構成のものがある（電気工学ハンドブ
ック ２９５ページ １９８８年版）。この直流電流計
測器は、被測定電流が流れる母線５１と、母線５１が挿
通され、互に逆特性でＮ２なる二次巻線が巻かれたトラ
ンス５２，５３と、トランス５２，５３と直列に接続さ
れたトランス５４，５６と、トランス５４の二次側に接
続された交流電源５５と、トランス５６の二次側に直列
に接続された整流器５７及び電流計５８とから構成され
ている。すなわち、トランス５２，５３において、交流
電源５５によって生じるアンペア回数と母線５１によっ
て生じるアンペア回数とが加わり、母線５１に流れる電
流に比例した期間、トランスの鉄芯が飽和し、それに比
例した電流が電流計５８に流れるようになっている。2. Description of the Related Art Conventionally, as a DC current measuring instrument of this type,
There is a structure as shown in FIG. 5 (Electrical Engineering Handbook, page 295, 1988 edition). This DC current measuring device includes a busbar 51 through which a current to be measured flows, transformers 52 and 53 in which the busbar 51 is inserted, and secondary windings of N2 having opposite characteristics are wound, and the transformers 52 and 53 in series. The transformers 54 and 56 are connected to each other, the AC power supply 55 is connected to the secondary side of the transformer 54, and the rectifier 57 and the ammeter 58 are connected in series to the secondary side of the transformer 56. That is, in the transformers 52 and 53, the amperage number generated by the AC power supply 55 and the amperage number generated by the bus bar 51 are added, and the iron core of the transformer is saturated for a period proportional to the current flowing through the bus line 51. A total of 58 flows.
【０００３】また、他の従来例として、図６に示すよう
な構成のものがある（電気工学ハンドブック ５１２ペ
ージ １９８８年版）。この直流電流計測器は、被測定
電流が流れる母線６１と、母線６１が挿通され、ギャッ
プが設けられた鉄芯６２と、鉄芯６２のギャップに挿入
されたホール素子６３と、ホール素子６３に電流を供給
する定電流電源６４と、ホール素子６３のホール効果電
圧を測定する電圧計６５とから構成されている。すなわ
ち、母線６１によって鉄芯６２に生じた磁束をホール素
子６３によって測定することができるようになってい
る。As another conventional example, there is one having a structure as shown in FIG. 6 (Electrical Engineering Handbook, page 512, 1988 edition). This DC current measuring device includes a busbar 61 through which a current to be measured flows, an iron core 62 through which the busbar 61 is inserted and a gap is provided, a Hall element 63 inserted in the gap of the iron core 62, and a Hall element 63. It is composed of a constant current power source 64 for supplying a current and a voltmeter 65 for measuring the Hall effect voltage of the Hall element 63. That is, the magnetic flux generated in the iron core 62 by the bus bar 61 can be measured by the hall element 63.
【０００４】[0004]
【発明が解決しようとする課題】しかし、図５に示した
従来の直流電流計測器では、４つのトランス５２，〜，
５４，５６を使用するので、複雑な回路となり、このた
め、製品コストが高くなるという問題がある。また、交
流電源５５からは正弦波のみをを出力する構造になって
いるので、汎用性に欠ける。一方、図６に示した従来の
直流電流計測器では、ホール素子６３によって磁束を測
定する構造であるので、外部磁界の影響を受けやすく、
このため、測定精度の信頼性に欠けるという問題があ
る。本発明は上記問題点にかんがみてなされたもので、
簡単な構造で製造することができると共に多様な交流電
源に対応することができ、しかも、測定信頼性の高い直
流電流計測器の提供を目的とする。However, in the conventional DC current measuring instrument shown in FIG. 5, the four transformers 52 ,.
Since 54 and 56 are used, the circuit becomes complicated, which causes a problem of high product cost. Further, since the AC power supply 55 has a structure that outputs only a sine wave, it lacks versatility. On the other hand, in the conventional DC current measuring device shown in FIG. 6, since the magnetic flux is measured by the Hall element 63, it is easily affected by the external magnetic field,
Therefore, there is a problem that the measurement accuracy is unreliable. The present invention has been made in consideration of the above problems,
It is an object of the present invention to provide a DC current measuring instrument which can be manufactured with a simple structure and can be applied to various AC power supplies and has high measurement reliability.
【０００５】[0005]
【課題を解決するための手段】上記目的を達成するた
め、本発明の直流電流計測器は、被測定電流の一方の分
流電流が通電する第一の分流抵抗と、この第一の分流抵
抗と並列に接続され、上記被測定電流の他方の分流電流
を入力するフォトカップラーと、このフォトカップラー
にスイッチング作用を行わせる交流電源と、上記フォト
カップラーの出力側に直列接続されたトランスと、この
トランスの二次側の電流又は電圧を測定する計測部と、
上記トランスの一次側の出力端に直列接続された第二の
分流抵抗とを備える構成としてある。また、請求項２記
載の直流電流計測器は、上記計測部を、交流電流計で形
成した構成としてあり、さらに、請求項３記載の直流電
流計測器は、上記計測部を、交流電圧計で形成した構成
としてある。また、請求項４の直流電流計測器では、請
求項２記載の直流電流計測器を複数並列に接続し、この
うち一の直流電流計測器の上記フォトカップラー及び交
流電源を、他の直流電流計測器のフォトカップラー及び
交流電源として共用した構成としてある。また、請求項
５の直流電流計測器では、請求項３記載の直流電流計測
器を複数並列に接続し、このうち一の直流電流計測器の
上記交流電源及び交流電圧計を、他の直流電流計測器の
交流電源及び交流電圧計として共用した構成としてあ
る。In order to achieve the above object, a DC current measuring device of the present invention is provided with a first shunt resistance through which one shunt current of a measured current flows, and the first shunt resistance. A photocoupler that is connected in parallel and that inputs the other shunt current of the current to be measured, an AC power supply that causes this photocoupler to perform a switching action, a transformer that is connected in series to the output side of the photocoupler, and this transformer. A measuring unit for measuring the current or voltage on the secondary side of
A second shunt resistor connected in series to the output terminal on the primary side of the transformer is provided. Moreover, the direct current measuring instrument according to claim 2 has a configuration in which the measuring section is formed by an alternating current ammeter, and the direct current measuring instrument according to claim 3 uses the alternating current voltmeter as the measuring section. It is a formed structure. Further, in the DC current measuring device according to claim 4, a plurality of DC current measuring devices according to claim 2 are connected in parallel, and the photocoupler and the AC power source of one DC current measuring device are connected to another DC current measuring device. It is configured to be shared as a photo coupler and AC power supply of the container. Further, in the DC current measuring instrument according to claim 5, a plurality of DC current measuring instruments according to claim 3 are connected in parallel, and the AC power source and the AC voltmeter of one DC current measuring instrument are connected to another DC current measuring instrument. The configuration is shared as an AC power source and AC voltmeter for the measuring instrument.
【０００６】[0006]
【作用】上記直流電流計測器によれば、被測定電流の一
方の分流電流が第一の分流抵抗に通電すると共に、他方
の分流電流がフォトカップラーに入力される。このフォ
トカップラーが、交流電源の作用によって、オン状態に
なっているときには、他の分流電流は、トランスと第二
の分流抵抗とに通電する。このとき、計測部によって、
トランスの二次側の電流又は電圧を測定することによ
り、非測定電流の電流値を求めることができる。According to the DC current measuring device, one shunt current of the current to be measured is applied to the first shunt resistance and the other shunt current is input to the photocoupler. When the photocoupler is in the ON state due to the action of the AC power supply, another shunt current flows through the transformer and the second shunt resistor. At this time, the measuring unit
By measuring the current or voltage on the secondary side of the transformer, the current value of the non-measured current can be obtained.
【０００７】[0007]
【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は、本発明の第一実施例に係る直流電
流計測器を示す回路図である。本実施例の直流電流計測
器１は、交流の被測定電流Ｉの一方の分流電流を通電す
る第一の分流抵抗２と、この第一の分流抵抗２と並列に
接続されたフォトカップラー３と、このフォトカップラ
ー３にスイッチング作用を行わせる交流電源６と、フォ
トカップラー３の出力側に直列接続されたトランス７
と、このトランス７の二次側に接続された計測部として
の交流電流計１０と、トランス７の一次側に直列接続さ
れた第二の分流抵抗ｒとで構成されている。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a circuit diagram showing a DC current measuring device according to a first embodiment of the present invention. The DC current measuring device 1 of the present embodiment includes a first shunt resistor 2 for passing one shunt current of an alternating current I to be measured, and a photocoupler 3 connected in parallel with the first shunt resistor 2. , An AC power supply 6 for causing the photocoupler 3 to perform a switching action, and a transformer 7 connected in series to the output side of the photocoupler 3.
And an AC ammeter 10 as a measuring unit connected to the secondary side of the transformer 7, and a second shunt resistance r connected in series to the primary side of the transformer 7.
【０００８】第一の分流抵抗２は、図示しない被測定回
路に直列に接続されるもので、抵抗値Ｒを有している。
フォトカップラー３は、図１に示すように、フォトラン
ジスタ４と発光ダイオード５とで形成されている。交流
電源６は、正弦波を出力し、その周波数によってフォト
カップラー３の発光ダイオード５に対してスイッチング
作用、すなわちオン，オフを行わせる機能を有してい
る。なお、この交流電源６は、上記正弦波ではなく、矩
形波等を出力させるようにすることもできる。The first shunt resistor 2 is connected in series to a circuit under test (not shown) and has a resistance value R.
As shown in FIG. 1, the photocoupler 3 is composed of a phototransistor 4 and a light emitting diode 5. The AC power source 6 outputs a sine wave and has a function of causing the light emitting diode 5 of the photocoupler 3 to perform a switching action, that is, to turn on and off depending on the frequency. The AC power source 6 may output a rectangular wave or the like instead of the sine wave.
【０００９】トランス７は、一次側巻線８と二次側巻線
９とで構成されており、これらの巻線比は１に設定され
ている。交流電流計１０は、上記トランス７の二次側巻
線９に直列に接続されている。第二の分流抵抗１１は、
トランス７の一次側巻線８の出力端に直列に接続されて
おり、その抵抗値ｒを有している。そして、この第二の
分流抵抗１１の出力端は第一の分流抵抗２の出力端と接
続されている。The transformer 7 is composed of a primary winding 8 and a secondary winding 9, and the winding ratio of these is set to 1. The AC ammeter 10 is connected in series to the secondary winding 9 of the transformer 7. The second shunt resistance 11 is
It is connected in series with the output terminal of the primary winding 8 of the transformer 7 and has its resistance value r. The output terminal of the second shunt resistor 11 is connected to the output terminal of the first shunt resistor 2.
【００１０】次に、本実施例の動作について説明する。
第一の分流抵抗２が被測定回路に直列に挿入されると、
その被測定電流Ｉが第一の分流抵抗２側とフォトカップ
ラー３側とに分流されて、入力される。フォトカップラ
ー３側に分流された分流電流は、フォトカップラー３の
スイッチング動作により、トランス７側に流れたり流れ
なかったりする。フォトカップラー３はオン状態におい
ては、分流電流ｉがトランス７の一次側巻線８を介して
第二の分流抵抗ｒに流れた後、第一の分流抵抗２を流れ
た分流電流と合流して、被測定電流Ｉとなる。Next, the operation of this embodiment will be described.
When the first shunt resistance 2 is inserted in series with the circuit under test,
The measured current I is shunted to the first shunt resistor 2 side and the photocoupler 3 side and input. The shunt current shunted to the photocoupler 3 side may or may not flow to the transformer 7 side due to the switching operation of the photocoupler 3. In the ON state of the photocoupler 3, the shunt current i flows through the primary winding 8 of the transformer 7 to the second shunt resistor r, and then merges with the shunt current flowing through the first shunt resistor 2. , And the measured current I.
【００１１】トランス７の一次側巻線８に分流電流ｉが
流れると、二次側巻線９に二次側電流ｉ´が誘導され
る。ここで、一次側巻線８に流れる分流電流ｉは、次の
（１）式で表される。 ｉ＝ＲＩ／（Ｒ＋ｒ） …（１） また、一次側巻線８と二次側巻線９とは上述したように
巻線比１に設定されているので、二次側電流ｉ´が一次
側巻線８の分流電流ｉの電流値と等しくなる。したがっ
て、二次側電流ｉ´を交流電流計１０で測定することに
より、未知数として被測定電流Ｉのみを含む上記（１）
式から、被測定電流Ｉを測定することができる。When the shunt current i flows through the primary winding 8 of the transformer 7, a secondary current i'is induced in the secondary winding 9. Here, the shunt current i flowing through the primary winding 8 is expressed by the following equation (1). i = RI / (R + r) (1) Since the winding ratio of the primary winding 8 and the secondary winding 9 is set to 1 as described above, the secondary current i ′ is the primary current. It becomes equal to the current value of the shunt current i of the side winding 8. Therefore, by measuring the secondary side current i ′ with the AC ammeter 10, only the measured current I is included as an unknown number in the above (1).
From the equation, the measured current I can be measured.
【００１２】以上のように本実施例の直流電流計測器１
によれば、第一及び第二の分流抵抗２，１１と、交流電
源６が接続されたフォトカップラー３と、１つのトラン
ス７と、交流電流計１０という僅かなかつ単純な構造の
部品で形成することができるので、直流電流計測器１全
体を簡単な構造にすることができる。この結果、直流電
流計測器１の製造コストを低減することができる。ま
た、交流電源６も正弦波に限定されず、多様な交流電源
を用いることができるので、汎用性に優れている。しか
も、外部磁界の発生がないので、外部磁界の影響を受け
ることはなく、この結果、高精度で被測定電流Ｉを測定
することができ、測定信頼性が高いものとなっている。
なお、本実施例では交流電流計１０を用いたが、これに
限るものではなく、交流電流計１０の代わりに整流回路
と直流電流計を接続したものを用いても良いことは勿論
である。As described above, the DC current measuring instrument 1 of this embodiment
According to this, the first and second shunt resistors 2 and 11, the photocoupler 3 to which the AC power source 6 is connected, the single transformer 7, and the AC ammeter 10 are formed by the components having a slight and simple structure. Therefore, the entire direct current measuring instrument 1 can have a simple structure. As a result, the manufacturing cost of the DC current measuring device 1 can be reduced. Further, the AC power supply 6 is not limited to the sine wave, and various AC power supplies can be used, so that it is excellent in versatility. Moreover, since the external magnetic field is not generated, it is not affected by the external magnetic field, and as a result, the current I to be measured can be measured with high accuracy and the measurement reliability is high.
Although the alternating current ammeter 10 is used in the present embodiment, the invention is not limited to this, and it goes without saying that a rectifier circuit and a direct current ammeter may be connected instead of the alternating current ammeter 10.
【００１３】次に本発明の第二実施例について説明す
る。図２は、本発明の第二実施例に係る直流電流計測器
を示す回路図である。本実施例の直流電流計測器２０
は、第二の分流抵抗１１がなく、かつ、交流電流計１０
の代わりに交流電圧計２０を適用している点が、上記第
一実施例の直流電流計測器１と異なる。Next, a second embodiment of the present invention will be described. FIG. 2 is a circuit diagram showing a DC current measuring device according to the second embodiment of the present invention. DC current measuring device 20 of the present embodiment
Does not have the second shunt resistance 11, and the AC ammeter 10
The point that an AC voltmeter 20 is applied instead of is different from the DC current measuring instrument 1 of the first embodiment.
【００１４】かかる構成により、フォトカップラー３が
オン状態にある時は、トランス７の一次側巻線８に一次
側電圧ｖが加わり、これにより、二次側巻線９には、二
次側電圧ｖ´が誘電されることとなる。これにより、一
次側巻線８に加わる一次側電圧ｖは次の（２）式で表さ
れる。 ｖ＝ＲＩ …（２） そして、一次側巻線８と二次側巻線９とが巻線比１に設
定されているので、一次側電圧ｖと二次側電圧ｖ´は等
しくなっている。したがって、交流電圧計２１により、
二次側電圧ｖ´を測定すれば、変数としてＲのみを含む
上記（２）式より、被測定電流Ｉを測定することができ
ることとなる。その他の構成，作用効果は上記第一実施
例と同様であるので、その記載は省略する。With such a configuration, when the photocoupler 3 is in the ON state, the primary side voltage v is applied to the primary side winding 8 of the transformer 7, whereby the secondary side voltage is applied to the secondary side winding 9. v'will be dielectric. Thus, the primary side voltage v applied to the primary side winding 8 is expressed by the following equation (2). v = RI (2) Since the winding ratio of the primary winding 8 and the secondary winding 9 is set to 1, the primary voltage v and the secondary voltage v ′ are equal. . Therefore, with the AC voltmeter 21,
If the secondary-side voltage v ′ is measured, the measured current I can be measured from the above equation (2) that includes only R as a variable. Other configurations, functions and effects are similar to those of the first embodiment described above, and the description thereof is omitted.
【００１５】次いで、本発明の第三実施例について説明
する。図３は、本発明の第三実施例に係る直流電流計測
器を示す回路図である。本実施例の直流電流計測器３０
は、上記第一実施例の直流電流計測器１を複数並列に接
続し、このうちの１の直流電流計測器１のフォトカップ
ラー３及び交流電源６を他の直流電流計測器１のフォト
カプラー及び交流電源として共用したものである。Next, a third embodiment of the present invention will be described. FIG. 3 is a circuit diagram showing a DC current measuring device according to a third embodiment of the present invention. DC current measuring device 30 of the present embodiment
A plurality of the DC current measuring devices 1 of the first embodiment are connected in parallel, and the photocoupler 3 and the AC power supply 6 of one of the DC current measuring devices 1 are connected to the photocoupler of another DC current measuring device 1 and It is also used as an AC power source.
【００１６】すなわち、図３に示すように、フォトカッ
プラー３及び交流電源６を装置の前段に設け、この後段
に、３つの直流電流計測器１−１，〜，１−３を並列に
接続した構成としている。具体的には、被測定電流Ｉが
分流される分岐線３１を各直流電流計測器１−１（１−
２，１−３）の分岐線３１−１（３１−２，３１−３）
に分岐させて、被測定電流Ｉの分流電流を各第一の分流
抵抗２−１（２−２，２−３）に分流するようになって
いる。That is, as shown in FIG. 3, a photocoupler 3 and an AC power supply 6 are provided in the front stage of the apparatus, and three DC current measuring instruments 1-1, 1-3, 1-3 are connected in parallel in the rear stage. It is configured. Specifically, the branch line 31 to which the measured current I is divided is connected to each DC current measuring device 1-1 (1-
2, 1-3) branch line 31-1 (31-2, 31-3)
The shunt current of the measured current I is shunted to each of the first shunt resistors 2-1 (2-2, 2-3).
【００１７】一方、フォトカップラー３に接続された分
岐線３２は、各直流電流計測器１−１（１−２，１−
３）の分岐線３２−１（３２−２，３２−３）に分岐さ
れ、フォトカップラー３のオン状態における分流電流を
各トランス７−１（７−２，７−３）と第二の分流電流
抵抗１１−１（１１−２，１１−３）に通電するように
なっている。On the other hand, the branch line 32 connected to the photocoupler 3 is connected to each DC current measuring device 1-1 (1-2, 1-).
3) is branched to the branch line 32-1 (32-2, 32-3), and the shunt current in the ON state of the photocoupler 3 is divided into the transformer 7-1 (7-2, 7-3) and the second shunt current. The current resistance 11-1 (11-2, 11-3) is energized.
【００１８】このような構成により、第一の分流抵抗２
−１，〜，２−３を３つの被測定回路に直列に挿入する
ことにより、３つの被測定回路の被測定電流を同時に測
定することができる。本実施例では上述のように１個の
フォトカップラー３及び１個の交流電源６を用いるだけ
で、３つの被測定回路を同時に測定することができるの
で、測定作業の能率化を図ることができると共に、直流
電流計測器３０の構造もさらに簡略化することができ
る。なお、本実施例では、直流電流計測器１を３つ並列
に接続しているが、これに限るものではなく、任意数の
直流電流計測器１を並列に接続できることは勿論であ
る。その他の構成，作用効果は上記第一実施例の直流電
流計測器１と同様であるので、その記載は省略する。With such a configuration, the first shunt resistance 2
By inserting -1, ..., 2-3 in series to the three circuits under test, the currents under measurement of the three circuits under test can be measured simultaneously. In the present embodiment, as described above, it is possible to simultaneously measure three circuits to be measured by using only one photocoupler 3 and one AC power supply 6, so that the measurement work can be made efficient. At the same time, the structure of the DC current measuring device 30 can be further simplified. In this embodiment, three DC current measuring devices 1 are connected in parallel, but the present invention is not limited to this, and it goes without saying that an arbitrary number of DC current measuring devices 1 can be connected in parallel. Other configurations and effects are the same as those of the DC current measuring instrument 1 of the first embodiment, and therefore the description thereof is omitted.
【００１９】最後に、本発明の第四実施例について説明
する。図４は、本発明の第四実施例に係る直流電流計測
器を示す回路図である。本実施例の直流電流計測器４０
は、図４に示すように、１つの交流電圧計２１に３つの
直流電流計測器２０−１，〜，２０−３を並列に接続す
ると共に、これら３つの直流電流計測器２０−１，〜，
２０−３の電源として交流電源６を共用し、この交流電
源６の供給をセレクタ４１によって選択できる構成にな
っている。Finally, a fourth embodiment of the present invention will be described. FIG. 4 is a circuit diagram showing a DC current measuring device according to the fourth embodiment of the present invention. DC current measuring device 40 of the present embodiment
4, as shown in FIG. 4, one AC voltmeter 21 is connected with three DC current measuring devices 20-1, ..., 20-3 in parallel, and these three DC current measuring devices 20-1 ,. ，
The AC power supply 6 is shared as the power supply of 20-3, and the supply of this AC power supply 6 can be selected by the selector 41.
【００２０】このような構成により、セレクタ４１の切
替により、測定を行うべき被測定回路にだけ交流電源６
を接続し、１つの交流電圧計２１でその被測定電流Ｉを
測定できる。なお、本実施例では、直流電流計測器２０
を３つ並列に接続しているが、これに限るものではな
く、任意数の直流電流計測器２０を並列に接続できるこ
とは勿論である。その他の構成，作用効果については上
記第二実施例と同様であるのでその記載は省略する。With such a configuration, by switching the selector 41, the AC power source 6 is provided only for the circuit under measurement to be measured.
, And the measured current I can be measured with one AC voltmeter 21. In this embodiment, the DC current measuring device 20
3 are connected in parallel, but the present invention is not limited to this, and it goes without saying that an arbitrary number of DC current measuring devices 20 can be connected in parallel. Other configurations, functions and effects are the same as those of the second embodiment, and therefore description thereof is omitted.
【００２１】[0021]
【発明の効果】以上のように本発明の直流電流計測器に
よれば、第一及び第二の分流抵抗と、交流電源が接続さ
れたフォトカップラーと、１つトランスと、計測部とい
う僅かかつ単純な構造の部品で構成されているので、直
流電流計測器全体として、簡単な構造となり、この結
果、直流電流計測器の製造コストを低減することができ
る。また、交流電源も正弦波に限定されず、多様な交流
電源を用いることができ、汎用性に優れている。しか
も、外部磁界の影響を受けないので、高精度で測定する
ことができ、測定信頼性が高い。As described above, according to the DC current measuring device of the present invention, the first and second shunt resistors, the photocoupler to which the AC power source is connected, the single transformer, and the measuring unit are provided. Since the DC current measuring device is composed of the components having a simple structure, the entire DC current measuring device has a simple structure, and as a result, the manufacturing cost of the DC current measuring device can be reduced. Further, the AC power supply is not limited to the sine wave, and various AC power supplies can be used, which is excellent in versatility. Moreover, since it is not affected by the external magnetic field, it is possible to perform measurement with high accuracy, and the measurement reliability is high.
【図１】本発明の第一実施例に係る直流電流計測器を示
す回路図である。FIG. 1 is a circuit diagram showing a DC current measuring device according to a first embodiment of the present invention.
【図２】本発明の第二実施例に係る直流電流計測器を示
す回路図である。FIG. 2 is a circuit diagram showing a DC current measuring device according to a second embodiment of the present invention.
【図３】本発明の第三実施例に係る直流電流計測器を示
す回路図である。FIG. 3 is a circuit diagram showing a DC current measuring device according to a third embodiment of the present invention.
【図４】本発明の第四実施例に係る直流電流計測器を示
す回路図である。FIG. 4 is a circuit diagram showing a DC current measuring device according to a fourth embodiment of the invention.
【図５】従来例に係る直流電流計測器を示す回路図であ
る。FIG. 5 is a circuit diagram showing a DC current measuring device according to a conventional example.
【図６】他の従来例に係る直流電流計測器を示す回路図
である。FIG. 6 is a circuit diagram showing a DC current measuring device according to another conventional example.
１ 直流電流計測器 ２ 第一の分流抵抗 ３ フォトカップラー ６ 交流電源 ７ トランス １０ 交流電流計 １１ 第二の分流抵抗 Ｉ 被測定電流 1 DC current measuring instrument 2 1st shunt resistance 3 Photocoupler 6 AC power supply 7 Transformer 10 AC ammeter 11 2nd shunt resistance I Current to be measured
Claims (5)
第一の分流抵抗と、 この第一の分流抵抗と並列に接続され、上記被測定電流
の他方の分流電流を入力するフォトカップラーと、 このフォトカップラーにスイッチング作用を行わせる交
流電源と、 上記フォトカップラーの出力側に直列接続されたトラン
スと、 このトランスの二次側の電流又は電圧を測定する計測部
と、 上記トランスの一次側の出力端に直列接続された第二の
分流抵抗とを備えることを特徴とした直流電流計測器。1. A first shunt resistance through which one of the measured currents flows, and a photocoupler connected in parallel with the first shunt resistance and for inputting the other shunt current of the measured current. , An AC power supply that causes this photocoupler to perform a switching action, a transformer connected in series to the output side of the photocoupler, a measurement unit that measures the current or voltage on the secondary side of this transformer, and the primary side of the transformer. And a second shunt resistance connected in series to the output end of the DC current measuring device.
求項１記載の直流電流計測器。2. The direct current measuring instrument according to claim 1, wherein the measuring section is formed by an alternating current ammeter.
求項１記載の直流電流計測器。3. The DC current measuring device according to claim 1, wherein the measuring unit is formed by an AC voltmeter.
列に接続し、このうち一の直流電流計測器の上記フォト
カップラー及び交流電源を、他の直流電流計測器のフォ
トカップラー及び交流電源として共用したことを特徴と
する直流電流計測器。4. A plurality of the DC current measuring devices according to claim 2 are connected in parallel, and the photocoupler and AC power supply of one DC current measuring device are connected to the photocoupler and AC power supply of another DC current measuring device. DC current measuring device characterized by being shared as.
列に接続し、このうち一の直流電流計測器の上記交流電
源及び交流電圧計を、他の直流電流計測器の交流電源及
び交流電圧計として共用したことを特徴とする直流電流
計測器。5. A plurality of the DC current measuring devices according to claim 3 are connected in parallel, and the AC power supply and AC voltmeter of one DC current measuring device are connected to the AC power supply and AC of another DC current measuring device. A DC current measuring device characterized by being shared as a voltmeter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5277705A JP2611635B2 (en) | 1993-10-08 | 1993-10-08 | DC current measuring instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5277705A JP2611635B2 (en) | 1993-10-08 | 1993-10-08 | DC current measuring instrument |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07110347A true JPH07110347A (en) | 1995-04-25 |
| JP2611635B2 JP2611635B2 (en) | 1997-05-21 |
Family
ID=17587170
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5277705A Expired - Lifetime JP2611635B2 (en) | 1993-10-08 | 1993-10-08 | DC current measuring instrument |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2611635B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19649304A1 (en) * | 1996-11-28 | 1998-06-04 | Alsthom Cge Alcatel | Switching arrangement for isolated voltage and / or current measurement |
| FR2791144A1 (en) * | 1999-03-19 | 2000-09-22 | Sextant Avionique | DEVICE FOR MONITORING THE CIRCULATION OF A SUBSTANTIALLY CONTINUOUS CURRENT IN A LOAD AND METHOD FOR IMPLEMENTING SAID DEVICE |
| WO2002052284A3 (en) * | 2000-12-25 | 2002-12-05 | Matsushita Electric Works Ltd | Electrical quantity sensor |
| FR2910173A1 (en) * | 2006-12-18 | 2008-06-20 | Schneider Electric Ind Sas | Electrically isolating current measuring device for e.g. voltage trigger, has control unit with input receiving control signals and output connected to switching units to control clipping of primary signal, during switching periods |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5979162A (en) * | 1982-10-28 | 1984-05-08 | Mitsubishi Electric Corp | Current detector |
| JPS629178U (en) * | 1985-07-02 | 1987-01-20 | ||
| JP3128864U (en) * | 2006-11-09 | 2007-01-25 | 有限会社武田企画 | Golf club |
-
1993
- 1993-10-08 JP JP5277705A patent/JP2611635B2/en not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5979162A (en) * | 1982-10-28 | 1984-05-08 | Mitsubishi Electric Corp | Current detector |
| JPS629178U (en) * | 1985-07-02 | 1987-01-20 | ||
| JP3128864U (en) * | 2006-11-09 | 2007-01-25 | 有限会社武田企画 | Golf club |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19649304A1 (en) * | 1996-11-28 | 1998-06-04 | Alsthom Cge Alcatel | Switching arrangement for isolated voltage and / or current measurement |
| US6184725B1 (en) | 1996-11-28 | 2001-02-06 | Alcatel | Circuit arrangement for isolated voltage and/or current measurement |
| FR2791144A1 (en) * | 1999-03-19 | 2000-09-22 | Sextant Avionique | DEVICE FOR MONITORING THE CIRCULATION OF A SUBSTANTIALLY CONTINUOUS CURRENT IN A LOAD AND METHOD FOR IMPLEMENTING SAID DEVICE |
| WO2000057197A1 (en) * | 1999-03-19 | 2000-09-28 | Thales Avionics S.A. | Method for monitoring a substantially direct current flow in a load |
| US6633156B1 (en) * | 1999-03-19 | 2003-10-14 | Thales Avionics S.A. | Device for monitoring the flow of a substantially direct current in a load and method for the implementation of this device |
| WO2002052284A3 (en) * | 2000-12-25 | 2002-12-05 | Matsushita Electric Works Ltd | Electrical quantity sensor |
| US6707287B2 (en) | 2000-12-25 | 2004-03-16 | Matsushita Electric Works, Ltd. | Electrical quantity sensor |
| FR2910173A1 (en) * | 2006-12-18 | 2008-06-20 | Schneider Electric Ind Sas | Electrically isolating current measuring device for e.g. voltage trigger, has control unit with input receiving control signals and output connected to switching units to control clipping of primary signal, during switching periods |
| WO2008087275A2 (en) * | 2006-12-18 | 2008-07-24 | Schneider Electric Industries Sas | Electrically insulated current measuring device, electronic trigger, and circuit breaker comprising such a device |
| WO2008087275A3 (en) * | 2006-12-18 | 2008-09-12 | Schneider Electric Ind Sas | Electrically insulated current measuring device, electronic trigger, and circuit breaker comprising such a device |
| US8378663B2 (en) | 2006-12-18 | 2013-02-19 | Schneider Electric Insustries SAS | Current measurement signal device with electrical isolation, electronic trip unit, and circuit breaker comprising one such device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2611635B2 (en) | 1997-05-21 |
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