WO2019181543A1 - Ct-type current sensor - Google Patents
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- WO2019181543A1 WO2019181543A1 PCT/JP2019/009158 JP2019009158W WO2019181543A1 WO 2019181543 A1 WO2019181543 A1 WO 2019181543A1 JP 2019009158 W JP2019009158 W JP 2019009158W WO 2019181543 A1 WO2019181543 A1 WO 2019181543A1
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- 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
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- the present invention relates to a CT-type current sensor that measures current by a CT (Current Transformer) method.
- CT Current Transformer
- a CT type current sensor is one type of current sensor.
- a primary winding and a secondary winding are wound around one core (iron core).
- core iron core
- an alternating current to be measured flows through the primary winding, a magnetic flux that changes in the core is generated, and an alternating current flows through the secondary winding in response to the change in the magnetic flux.
- an alternating current flowing in the secondary winding is converted into a voltage by a shunt resistor or the like and measured.
- the direction of the magnetic flux in the core alternately changes in the opposite direction corresponding to the direction of the current, so that the core is not magnetically saturated.
- the core is magnetized because the DC component is generated by the DC component contained in the current. Almost saturated. In this case, in order to prevent magnetic saturation of the core, it is necessary to enlarge the core or to provide a gap in the core.
- An object of the present invention is to provide a CT type current sensor that can use a small core when measuring a change in current superimposed on a direct current.
- the CT type current sensor of the present invention comprises: A core made of a material that allows easy passage of magnetic flux, A first coil and a second coil wound in different positions in the core and connected in the direction of differential connection; A short circuit coil wound around a predetermined position of the core; A detection coil wound around the second coil in the core and having a larger number of turns than the number of turns of the second coil; It is characterized by providing.
- a small core can be used when measuring a change in current superimposed on a direct current using a CT current sensor.
- FIG. 1 It is a figure which shows an example of the circuit structure of the CT system current sensor which concerns on embodiment of this invention. It is a figure which shows an example of the specific structure of the CT system current sensor of FIG. It is a figure which shows an example of the electric current of the measuring object with which the alternating current component was superimposed on the direct current component. It is a figure which shows an example of the magnetic flux produced by a direct-current component. It is a figure which shows the example which measures the electric current which flows into the primary coil of a DC / DC converter using the CT system current sensor of FIG. It is a figure which shows an example of the electric current which flows into the primary coil of the DC / DC converter of FIG.
- FIG. 1 shows an example of a circuit configuration of a CT current sensor 1 according to an embodiment of the present invention.
- FIG. 2 shows an example of a specific structure of the CT current sensor 1.
- the CT system current sensor 1 includes a coil 10, a coil 11, a short-circuit coil 20, a detection coil 30, a shunt resistor SR, and a core 40.
- the core 40 is, for example, annular.
- the core 40 is made of a material that can easily pass magnetic flux such as iron.
- the coil 10 and the coil 11 are wound around the core 40. The number of turns of the coil 10 and the coil 11 is the same.
- the coil 10 and the coil 11 are differentially connected.
- the coil 10 has a winding start connected to the terminal T1.
- the coil 11 has its winding start connected to the terminal T2.
- the winding ends of the coil 10 and the coil 11 are connected.
- the self-inductances of the coil 10 and the coil 11 are L1 and L2, respectively, and the mutual inductance is M, the combined inductance of the coil 10 and the coil 11 is L1 + L2-2M.
- the short-circuit coil 20 has a winding wound a plurality of times, and the winding start and winding end of the winding are short-circuited.
- the short-circuit coil 20 may be a short-circuit ring in which the wiring is in a ring shape. In the present invention, the shorting ring is included in the shorting coil.
- the short-circuit coil 20 is wound around a predetermined position of the core 40. For example, the short-circuit coil 20 is wound around the coil 10 in the core 40 or around the coil 10.
- the detection coil 30 is wound around the coil 11 in the core 40. The number of turns of the detection coil 30 is usually larger than the number of turns of the coil 11.
- a shunt resistor SR is connected to both ends of the detection coil 30.
- the resistance value of the shunt resistor SR is very small. Further, both ends of the detection coil 30 are connected to the terminal T3 and the terminal T4.
- FIG. 3 shows an example of the current to be measured in which the AC component ia is superimposed on the DC component Id.
- this current flows from the terminal T1 toward the terminal T2, as shown in FIG. 4, a magnetic flux ⁇ I1 and a magnetic flux ⁇ I2 are generated in the coil 10 and the coil 11, respectively, by the direct current component Id.
- the directions of the magnetic flux ⁇ I1 and the magnetic flux ⁇ I2 are opposite to each other and cancel each other. For this reason, even if the direct current component Id flows, no direct current magnetization is generated in the core 40.
- the current shown in FIG. 3 flows from the terminal T1 toward the terminal T2
- the current flows through the short-circuit coil 20 so as to cancel the magnetic flux generated by the AC component ia, and a closed circuit including the detection coil 30 and the shunt resistor SR is formed.
- Current flows.
- a voltage generated in the shunt resistor SR is output between the terminal T3 and the terminal T4. With this voltage, the alternating current component ia can be measured.
- the CT type current sensor 1 can be used, for example, to measure the fluctuation of the current flowing through the DC bus in the high voltage DC power supply system on the high potential side line. Further, for example, if the wiring pattern is long on the printed board, a DC voltage may be generated between the wiring pattern and the ground. In such a case, the CT type current sensor 1 can measure the fluctuation of the current flowing in the wiring pattern without being affected by the direct-current bias.
- FIG. 5 shows an example in which the current flowing through the primary coil of the DC / DC converter 100 is measured using the CT current sensor 1.
- the terminal T2 of the CT current sensor 1 is connected to the input on the high potential side of the flyback DC / DC converter 100.
- the input on the low potential side of the DC / DC converter 100 is connected to the terminal T5.
- a DC voltage is input to the terminals T1 and T5.
- the DC voltage converted by the DC / DC converter 100 is output to the terminals T6 and T7.
- the switching element (NMOS transistor) 101 of the DC / DC converter 100 is driven by PWM (Pulse Width Modulation) control.
- PWM Pulse Width Modulation
- the current ic flowing through the primary coil of the DC / DC converter 100 changes as shown in FIG.
- the current ic gradually increases while the switching element 101 is on, and returns to 0 when the switching element 101 is turned off.
- the AC component magnetic flux generated in the coil 10 by the current ic is canceled by the magnetic flux generated in the short-circuit coil 20.
- the current ic can be measured by the voltage (voltage between the terminal T3 and the terminal T4) generated in the shunt resistor SR.
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Abstract
A small core is used when this CT-type current sensor is used to measure the amount of change in a current in which direct currents are superimposed. A coil 10 and a coil 11 are wound onto a core 40 in different locations, and are connected in a differential connection orientation. A short-circuit coil 20 is, for example, wound onto the core 40, overlapping with the coil 10 or near the coil 10. A detection coil 30 is wound onto the core 40, overlapping with the coil 11. The number of turns of the detection coil 30 is greater than the number of turns of the coil 11. A shunt resistor SR is connected to both ends of the detection coil 30. When, for example, a measurement target current in which an alternating current component ia is superimposed on a direct current component Id flows from a terminal T1 toward a terminal T2, a voltage corresponding to the alternating current component ia is produced in the shunt resistor SR. The voltage produced in the shunt resistor SR is outputted between a terminal T3 and a terminal T4. Due to this voltage, the alternating current component ia can be measured.
Description
本発明は、CT(Current Transformer)方式により電流を計測するCT方式電流センサに関する。
The present invention relates to a CT-type current sensor that measures current by a CT (Current Transformer) method.
電流センサの一種にCT方式電流センサがある。CT方式電流センサでは、1つのコア(鉄心)に一次巻線と二次巻線が巻回されている。一次巻線に測定対象の交流電流を流すとコアの中に変化する磁束が生じ、この磁束の変化に対応して二次巻線に交流電流が流れる。CT方式電流センサでは、二次巻線に流れる交流電流をシャント抵抗等により電圧に変換して測定する。
A CT type current sensor is one type of current sensor. In the CT type current sensor, a primary winding and a secondary winding are wound around one core (iron core). When an alternating current to be measured flows through the primary winding, a magnetic flux that changes in the core is generated, and an alternating current flows through the secondary winding in response to the change in the magnetic flux. In the CT type current sensor, an alternating current flowing in the secondary winding is converted into a voltage by a shunt resistor or the like and measured.
CT方式電流センサを用いて交流電流を測定する場合、電流の方向に対応してコア内の磁束の方向が交互に逆方向に変化するため、コアは磁気飽和しない。
しかし、直流電流に変化する電流が重畳しており、その電流の変化分をCT方式電流センサで測定する場合には、電流に含まれる直流成分によってコアに直流偏磁が生じるため、コアが磁気飽和しやすい。この場合、コアの磁気飽和を防ぐために、コアを大型化したり、コアにギャップを設けたりしなければならない。 When measuring an alternating current using a CT current sensor, the direction of the magnetic flux in the core alternately changes in the opposite direction corresponding to the direction of the current, so that the core is not magnetically saturated.
However, when the current that changes is superimposed on the DC current and the change in the current is measured with a CT current sensor, the core is magnetized because the DC component is generated by the DC component contained in the current. Easily saturated. In this case, in order to prevent magnetic saturation of the core, it is necessary to enlarge the core or to provide a gap in the core.
しかし、直流電流に変化する電流が重畳しており、その電流の変化分をCT方式電流センサで測定する場合には、電流に含まれる直流成分によってコアに直流偏磁が生じるため、コアが磁気飽和しやすい。この場合、コアの磁気飽和を防ぐために、コアを大型化したり、コアにギャップを設けたりしなければならない。 When measuring an alternating current using a CT current sensor, the direction of the magnetic flux in the core alternately changes in the opposite direction corresponding to the direction of the current, so that the core is not magnetically saturated.
However, when the current that changes is superimposed on the DC current and the change in the current is measured with a CT current sensor, the core is magnetized because the DC component is generated by the DC component contained in the current. Easily saturated. In this case, in order to prevent magnetic saturation of the core, it is necessary to enlarge the core or to provide a gap in the core.
本発明の目的は、直流電流に重畳している電流の変化分を測定する場合に小型のコアを使用することができるCT方式電流センサを提供することである。
An object of the present invention is to provide a CT type current sensor that can use a small core when measuring a change in current superimposed on a direct current.
上記目的を達成するために、本発明のCT方式電流センサは、
磁束を通しやすい材料で作られたコアと、
前記コアにおいて異なる位置に巻回され、差動接続の向きに接続された第1のコイルおよび第2のコイルと、
前記コアの所定の位置に巻回された短絡コイルと、
前記コアにおいて前記第2のコイルに重ねて巻回されており、前記第2のコイルの巻き数よりも巻き数が多い検出コイルと、
を備えることを特徴とする。 In order to achieve the above object, the CT type current sensor of the present invention comprises:
A core made of a material that allows easy passage of magnetic flux,
A first coil and a second coil wound in different positions in the core and connected in the direction of differential connection;
A short circuit coil wound around a predetermined position of the core;
A detection coil wound around the second coil in the core and having a larger number of turns than the number of turns of the second coil;
It is characterized by providing.
磁束を通しやすい材料で作られたコアと、
前記コアにおいて異なる位置に巻回され、差動接続の向きに接続された第1のコイルおよび第2のコイルと、
前記コアの所定の位置に巻回された短絡コイルと、
前記コアにおいて前記第2のコイルに重ねて巻回されており、前記第2のコイルの巻き数よりも巻き数が多い検出コイルと、
を備えることを特徴とする。 In order to achieve the above object, the CT type current sensor of the present invention comprises:
A core made of a material that allows easy passage of magnetic flux,
A first coil and a second coil wound in different positions in the core and connected in the direction of differential connection;
A short circuit coil wound around a predetermined position of the core;
A detection coil wound around the second coil in the core and having a larger number of turns than the number of turns of the second coil;
It is characterized by providing.
本発明によれば、CT方式電流センサを用いて直流電流に重畳している電流の変化分を測定する場合に小型のコアを使用することができる。
According to the present invention, a small core can be used when measuring a change in current superimposed on a direct current using a CT current sensor.
以下、本発明の実施形態に係るCT方式電流センサについて図面を参照しながら詳細に説明する。なお、実施形態を説明する全図において、共通の構成要素には同一の符号を付し、繰り返しの説明を省略する。
Hereinafter, a CT type current sensor according to an embodiment of the present invention will be described in detail with reference to the drawings. In all the drawings for explaining the embodiments, common constituent elements are denoted by the same reference numerals, and repeated explanation is omitted.
図1は、本発明の実施形態に係るCT方式電流センサ1の回路構成の一例を示す。図2は、CT方式電流センサ1の具体的な構造の一例を示す。
CT方式電流センサ1は、コイル10と、コイル11と、短絡コイル20と、検出コイル30と、シャント抵抗SRと、コア40とを有する。
コア40は、例えば、環状である。コア40は、鉄のような磁束を通しやすい材料で作られている。
コイル10とコイル11は、コア40に巻回されている。コイル10とコイル11の巻き数は同一である。コイル10とコイル11は、差動接続されている。コイル10は、巻き始めが端子T1に接続されている。コイル11は、巻き始めが端子T2に接続されている。コイル10とコイル11の巻き終わりは接続されている。
コイル10とコイル11の自己インダクタンスをそれぞれL1とL2、相互インダクタンスをMとすると、コイル10とコイル11の合成インダクタンスはL1+L2-2Mとなる。 FIG. 1 shows an example of a circuit configuration of a CTcurrent sensor 1 according to an embodiment of the present invention. FIG. 2 shows an example of a specific structure of the CT current sensor 1.
The CT systemcurrent sensor 1 includes a coil 10, a coil 11, a short-circuit coil 20, a detection coil 30, a shunt resistor SR, and a core 40.
Thecore 40 is, for example, annular. The core 40 is made of a material that can easily pass magnetic flux such as iron.
Thecoil 10 and the coil 11 are wound around the core 40. The number of turns of the coil 10 and the coil 11 is the same. The coil 10 and the coil 11 are differentially connected. The coil 10 has a winding start connected to the terminal T1. The coil 11 has its winding start connected to the terminal T2. The winding ends of the coil 10 and the coil 11 are connected.
When the self-inductances of thecoil 10 and the coil 11 are L1 and L2, respectively, and the mutual inductance is M, the combined inductance of the coil 10 and the coil 11 is L1 + L2-2M.
CT方式電流センサ1は、コイル10と、コイル11と、短絡コイル20と、検出コイル30と、シャント抵抗SRと、コア40とを有する。
コア40は、例えば、環状である。コア40は、鉄のような磁束を通しやすい材料で作られている。
コイル10とコイル11は、コア40に巻回されている。コイル10とコイル11の巻き数は同一である。コイル10とコイル11は、差動接続されている。コイル10は、巻き始めが端子T1に接続されている。コイル11は、巻き始めが端子T2に接続されている。コイル10とコイル11の巻き終わりは接続されている。
コイル10とコイル11の自己インダクタンスをそれぞれL1とL2、相互インダクタンスをMとすると、コイル10とコイル11の合成インダクタンスはL1+L2-2Mとなる。 FIG. 1 shows an example of a circuit configuration of a CT
The CT system
The
The
When the self-inductances of the
短絡コイル20は、複数回巻かれた巻線を有し、その巻線の巻き始めと巻き終わりが短絡されている。また、短絡コイル20は、配線がリング状になっている短絡リングであってもよい。本発明では、短絡リングは短絡コイルに含まれるものとする。短絡コイル20は、コア40の所定の位置に巻回される。例えば、短絡コイル20は、コア40においてコイル10に重ねて、またはコイル10の近傍に巻回される。
検出コイル30は、コア40においてコイル11に重ねて巻回される。検出コイル30の巻き数は、通常コイル11の巻き数よりも多い。コイル11の巻き数に対して検出コイル30の巻き数が多いほど検出コイルに流れる電流は小さくなる。
検出コイル30の両端には、シャント抵抗SRが接続される。シャント抵抗SRの抵抗値は非常に小さい。また、検出コイル30の両端は、端子T3と端子T4とに接続される。 The short-circuit coil 20 has a winding wound a plurality of times, and the winding start and winding end of the winding are short-circuited. The short-circuit coil 20 may be a short-circuit ring in which the wiring is in a ring shape. In the present invention, the shorting ring is included in the shorting coil. The short-circuit coil 20 is wound around a predetermined position of the core 40. For example, the short-circuit coil 20 is wound around the coil 10 in the core 40 or around the coil 10.
Thedetection coil 30 is wound around the coil 11 in the core 40. The number of turns of the detection coil 30 is usually larger than the number of turns of the coil 11. The greater the number of turns of the detection coil 30 relative to the number of turns of the coil 11, the smaller the current flowing through the detection coil.
A shunt resistor SR is connected to both ends of thedetection coil 30. The resistance value of the shunt resistor SR is very small. Further, both ends of the detection coil 30 are connected to the terminal T3 and the terminal T4.
検出コイル30は、コア40においてコイル11に重ねて巻回される。検出コイル30の巻き数は、通常コイル11の巻き数よりも多い。コイル11の巻き数に対して検出コイル30の巻き数が多いほど検出コイルに流れる電流は小さくなる。
検出コイル30の両端には、シャント抵抗SRが接続される。シャント抵抗SRの抵抗値は非常に小さい。また、検出コイル30の両端は、端子T3と端子T4とに接続される。 The short-
The
A shunt resistor SR is connected to both ends of the
図3は、直流成分Idに交流成分iaが重畳した測定対象の電流の一例を示す。この電流が端子T1から端子T2に向けて流れるとき、図4に示すように、直流成分Idによってコイル10とコイル11とにそれぞれ磁束ΦI1が磁束ΦI2が生じる。磁束ΦI1と磁束ΦI2の向きは逆向きであり、互いに打ち消し合う。このため、直流成分Idが流れてもコア40に直流偏磁は生じない。
FIG. 3 shows an example of the current to be measured in which the AC component ia is superimposed on the DC component Id. When this current flows from the terminal T1 toward the terminal T2, as shown in FIG. 4, a magnetic flux ΦI1 and a magnetic flux ΦI2 are generated in the coil 10 and the coil 11, respectively, by the direct current component Id. The directions of the magnetic flux ΦI1 and the magnetic flux ΦI2 are opposite to each other and cancel each other. For this reason, even if the direct current component Id flows, no direct current magnetization is generated in the core 40.
また、図3に示す電流が端子T1から端子T2に向けて流れるとき、交流成分iaによって生じる磁束を打ち消すように短絡コイル20に電流が流れるとともに、検出コイル30とシャント抵抗SRからなる閉回路に電流が流れる。端子T3と端子T4の間には、シャント抵抗SRに生じる電圧が出力される。この電圧により、交流成分iaを測定することができる。
Further, when the current shown in FIG. 3 flows from the terminal T1 toward the terminal T2, the current flows through the short-circuit coil 20 so as to cancel the magnetic flux generated by the AC component ia, and a closed circuit including the detection coil 30 and the shunt resistor SR is formed. Current flows. A voltage generated in the shunt resistor SR is output between the terminal T3 and the terminal T4. With this voltage, the alternating current component ia can be measured.
従って、CT方式電流センサ1は、例えば、高電圧直流給電システムにおける直流バスを流れる電流の変動を高電位側のラインで測定するために使用することができる。
また、例えば、プリント基板において配線パターンが長いと、配線パターンとグランドの間に直流電圧が生じる場合がある。CT方式電流センサ1は、このような場合に直流偏磁の影響を受けずに配線パターンに流れる電流の変動を測定することができる。 Therefore, the CT typecurrent sensor 1 can be used, for example, to measure the fluctuation of the current flowing through the DC bus in the high voltage DC power supply system on the high potential side line.
Further, for example, if the wiring pattern is long on the printed board, a DC voltage may be generated between the wiring pattern and the ground. In such a case, the CT typecurrent sensor 1 can measure the fluctuation of the current flowing in the wiring pattern without being affected by the direct-current bias.
また、例えば、プリント基板において配線パターンが長いと、配線パターンとグランドの間に直流電圧が生じる場合がある。CT方式電流センサ1は、このような場合に直流偏磁の影響を受けずに配線パターンに流れる電流の変動を測定することができる。 Therefore, the CT type
Further, for example, if the wiring pattern is long on the printed board, a DC voltage may be generated between the wiring pattern and the ground. In such a case, the CT type
図5は、CT方式電流センサ1を用いてDC/DCコンバータ100の一次コイルに流れる電流を測定する例を示す。
CT方式電流センサ1の端子T2は、フライバック方式のDC/DCコンバータ100の高電位側の入力に接続される。DC/DCコンバータ100の低電位側の入力は端子T5に接続される。端子T1と端子T5には直流電圧が入力される。端子T6と端子T7には、DC/DCコンバータ100によって変換された直流電圧が出力される。 FIG. 5 shows an example in which the current flowing through the primary coil of the DC /DC converter 100 is measured using the CT current sensor 1.
The terminal T2 of theCT current sensor 1 is connected to the input on the high potential side of the flyback DC / DC converter 100. The input on the low potential side of the DC / DC converter 100 is connected to the terminal T5. A DC voltage is input to the terminals T1 and T5. The DC voltage converted by the DC / DC converter 100 is output to the terminals T6 and T7.
CT方式電流センサ1の端子T2は、フライバック方式のDC/DCコンバータ100の高電位側の入力に接続される。DC/DCコンバータ100の低電位側の入力は端子T5に接続される。端子T1と端子T5には直流電圧が入力される。端子T6と端子T7には、DC/DCコンバータ100によって変換された直流電圧が出力される。 FIG. 5 shows an example in which the current flowing through the primary coil of the DC /
The terminal T2 of the
DC/DCコンバータ100のスイッチング素子(NMOSトランジスタ)101は、PWM(Pulse Width Modulation)制御により駆動される。DC/DCコンバータ100の一次コイルに流れる電流icは、図6に示すように変化する。電流icは、スイッチング素子101がオンの間に徐々に増加し、スイッチング素子101がオフになったときに0に戻る。
電流icによってコイル10に生じる交流成分の磁束は、短絡コイル20に生じる磁束で打ち消される。
シャント抵抗SRに生じる電圧(端子T3と端子T4の間の電圧)により、電流icを測定することができる。 The switching element (NMOS transistor) 101 of the DC /DC converter 100 is driven by PWM (Pulse Width Modulation) control. The current ic flowing through the primary coil of the DC / DC converter 100 changes as shown in FIG. The current ic gradually increases while the switching element 101 is on, and returns to 0 when the switching element 101 is turned off.
The AC component magnetic flux generated in thecoil 10 by the current ic is canceled by the magnetic flux generated in the short-circuit coil 20.
The current ic can be measured by the voltage (voltage between the terminal T3 and the terminal T4) generated in the shunt resistor SR.
電流icによってコイル10に生じる交流成分の磁束は、短絡コイル20に生じる磁束で打ち消される。
シャント抵抗SRに生じる電圧(端子T3と端子T4の間の電圧)により、電流icを測定することができる。 The switching element (NMOS transistor) 101 of the DC /
The AC component magnetic flux generated in the
The current ic can be measured by the voltage (voltage between the terminal T3 and the terminal T4) generated in the shunt resistor SR.
以上説明したように、本実施形態に係るCT方式電流センサ1のコア40には、直流成分に交流成分が重畳している電流が流れても偏磁が生じない。従って、本発明によれば、CT方式電流センサを用いて直流電流に重畳している電流の変化分を測定する場合に小型のコアを使用することができる。
As described above, no bias is generated in the core 40 of the CT current sensor 1 according to the present embodiment even when a current in which an AC component is superimposed on a DC component flows. Therefore, according to the present invention, a small core can be used when measuring a change in current superimposed on a direct current using a CT current sensor.
以上、本発明の実施形態について説明したが、設計または製造上の都合やその他の要因によって必要となる様々な修正や組み合わせは、請求項に記載されている発明や発明の実施形態に記載されている具体例に対応する発明の範囲に含まれる。
Although the embodiments of the present invention have been described above, various modifications and combinations necessary for design or manufacturing convenience and other factors are described in the claimed invention and the embodiments of the invention. It is included in the scope of the invention corresponding to the specific example.
1…CT方式電流センサ、10,11…コイル、20…短絡コイル、30…検出コイル、40…コア、SR…シャント抵抗、100…フライバック方式DC/DCコンバータ、101…スイッチング素子
DESCRIPTION OF SYMBOLS 1 ... CT system current sensor 10, 11 ... Coil, 20 ... Short-circuit coil, 30 ... Detection coil, 40 ... Core, SR ... Shunt resistance, 100 ... Flyback system DC / DC converter, 101 ... Switching element
Claims (1)
- 磁束を通しやすい材料で作られたコアと、
前記コアにおいて異なる位置に巻回され、差動接続の向きに接続された第1のコイルおよび第2のコイルと、
前記コアの所定の位置に巻回された短絡コイルと、
前記コアにおいて前記第2のコイルに重ねて巻回されており、前記第2のコイルの巻き数よりも巻き数が多い検出コイルと、
を備えることを特徴とするCT方式電流センサ。 A core made of a material that allows easy passage of magnetic flux,
A first coil and a second coil wound in different positions in the core and connected in the direction of differential connection;
A short circuit coil wound around a predetermined position of the core;
A detection coil wound around the second coil in the core and having a larger number of turns than the number of turns of the second coil;
A CT-type current sensor comprising:
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JP2018052981A JP2019164082A (en) | 2018-03-20 | 2018-03-20 | Ct system current sensor |
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