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JP6920832B2 - Current sensor and watt-hour meter - Google Patents

Current sensor and watt-hour meter Download PDF

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JP6920832B2
JP6920832B2 JP2017041618A JP2017041618A JP6920832B2 JP 6920832 B2 JP6920832 B2 JP 6920832B2 JP 2017041618 A JP2017041618 A JP 2017041618A JP 2017041618 A JP2017041618 A JP 2017041618A JP 6920832 B2 JP6920832 B2 JP 6920832B2
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JP2018146388A (en
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芳准 山内
芳准 山内
工藤 高裕
高裕 工藤
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富士電機メーター株式会社
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Description

本発明は、コイルパターンが形成された検出コイルを有した基板に外力が掛かって歪む場合であっても電流計測精度の低下を少なくすることができる電流センサ及び電力量計に関する。 The present invention relates to a current sensor and a watt-hour meter that can reduce a decrease in current measurement accuracy even when an external force is applied to a substrate having a detection coil in which a coil pattern is formed and the substrate is distorted.

従来、用いられている電流センサとしては、変流器(カレントトランス:CT)や、集磁コアのギャップ部にホール素子などの磁電変換素子を配置した構成や、集磁コアのギャップ部に巻線コイルや誘電体基板上にコイルパターンを形成した素子をもつ構成などがある。特に集磁コアのギャップ部に、基板上にコイルパターンを形成した素子を配置する方法は、直線性及び温度特性に優れ、部品点数が少なく製造が容易となる特徴を有する(特許文献1参照)。 Conventionally used current sensors include a current transformer (current transformer: CT), a configuration in which a magnetic-electric conversion element such as a Hall element is arranged in the gap portion of the magnetic collection core, or a winding in the gap portion of the magnetic collection core. There is a configuration having an element in which a coil pattern is formed on a wire coil or a dielectric substrate. In particular, the method of arranging the element in which the coil pattern is formed on the substrate in the gap portion of the magnetic collecting core has excellent linearity and temperature characteristics, has a small number of parts, and is easy to manufacture (see Patent Document 1). ..

特許文献1に記載された電流センサは、環状の集磁コアの中央開口部に電流バーを通し、集磁コアのギャップ部にコイルパターンが施された基板を配置するものである。電流バーに電流が流れると、電流路の周辺には、電流バーに流れる電流の大きさに比例する磁束が発生する。発生した磁束は、集磁コアによって集磁される。電流が周期的電流である場合、その周期に応じて発生する磁束も周期的に変化する。これにより、コイルパターンをもつ検出コイルには、電流の大きさ及び周波数に応じた誘導電圧が発生し、この誘導電圧を電流バーに流れる電流の検出信号として用いている。 In the current sensor described in Patent Document 1, a current bar is passed through the central opening of the annular magnetic collecting core, and a substrate having a coil pattern is arranged in the gap portion of the magnetic collecting core. When a current flows through the current bar, a magnetic flux proportional to the magnitude of the current flowing through the current bar is generated around the current path. The generated magnetic flux is collected by the magnetic collecting core. When the current is a periodic current, the magnetic flux generated according to the period also changes periodically. As a result, an induced voltage corresponding to the magnitude and frequency of the current is generated in the detection coil having the coil pattern, and this induced voltage is used as a detection signal of the current flowing through the current bar.

特開2010−48755号公報Japanese Unexamined Patent Publication No. 2010-48755

ところで、特許文献1に記載した電流センサは、検出コイル全体を鎖交する全磁束の大きさに比例した検出信号を出力する。このため、基板の検出コイルが変形するなどしてコイル部分の断面積が変化した場合、この変化に応じて鎖交する磁束が変化し検出信号も変化する。また、集磁コアのギャップに発生する磁束は、ギャップの中心から集磁コアの端部に近づくほど強くなり、集磁コアの端部から離れるほど弱くなるため、検出コイルの変形に伴う検出コイルの位置ずれによって検出信号も変化する。 By the way, the current sensor described in Patent Document 1 outputs a detection signal proportional to the magnitude of the total magnetic flux interlinking the entire detection coil. Therefore, when the cross-sectional area of the coil portion changes due to deformation of the detection coil on the substrate, the magnetic flux interlinking changes according to this change, and the detection signal also changes. Further, the magnetic flux generated in the gap of the magnetic collecting core becomes stronger as it approaches the end of the magnetic collecting core from the center of the gap, and becomes weaker as it moves away from the end of the magnetic collecting core. The detection signal also changes due to the misalignment of.

したがって、基板を固定する部分が熱や経年劣化などにより変形し、外部応力が働いた場合、基板が歪み、検出コイルの形状や配置位置が変化してしまい、電流計測精度が低下するという問題がある。また、組立固定時に、過大な応力が掛かることによっても基板が塑性変形するので、これに伴い検出コイルの形状や配置位置が変化してしまい、電流計測精度が低下するという問題がある。 Therefore, if the part that fixes the board is deformed due to heat or deterioration over time and external stress is applied, the board will be distorted, the shape and placement position of the detection coil will change, and the current measurement accuracy will decrease. be. Further, since the substrate is plastically deformed by applying an excessive stress during assembly and fixing, the shape and arrangement position of the detection coil are changed accordingly, and there is a problem that the current measurement accuracy is lowered.

本発明は、上記に鑑みてなされたものであって、コイルパターンが形成された検出コイルを有した基板に外力が掛かって歪む場合であっても電流計測精度の低下を少なくすることができる電流センサ及び電力量計を提供することを目的とする。 The present invention has been made in view of the above, and a current capable of reducing a decrease in current measurement accuracy even when an external force is applied to a substrate having a detection coil in which a coil pattern is formed and the substrate is distorted. It is an object of the present invention to provide a sensor and an electric energy meter.

上述した課題を解決し、目的を達成するために、本発明にかかる電流センサは、電流を流す電流バーと、前記電流バーを囲むように形成された集磁コアと、前記集磁コアのギャップに介在されて磁気検出を行うコイルパターンが設けられ、前記電流バーに流れる電流量を検出する基板とを有した電流センサであって、前記コイルパターンは基板上に形成され、前記コイルパターンが形成された検出部の周辺に空隙を設けたことを特徴とする。 In order to solve the above-mentioned problems and achieve the object, the current sensor according to the present invention has a gap between a current bar through which a current flows, a magnetic collecting core formed so as to surround the current bar, and the magnetic collecting core. A current sensor provided with a coil pattern for magnetic detection, which is interposed in the current sensor and has a substrate for detecting the amount of current flowing through the current bar. The coil pattern is formed on the substrate, and the coil pattern is formed. It is characterized in that a gap is provided around the detected detection unit.

また、本発明にかかる電流センサは、上記の発明において、前記空隙は、前記検出部の周辺に2箇所以上設けられることを特徴とする。 Further, the current sensor according to the present invention is characterized in that, in the above invention, the voids are provided at two or more locations around the detection unit.

また、本発明にかかる電流センサは、上記の発明において、前記空隙は、前記検出部の周辺で対向する2辺に沿うように形成され、前記2辺に沿った空隙の長さは、前記2辺に沿った前記検出部内のコイルパターンの長さよりも長いことを特徴とする。 Further, in the current sensor according to the present invention, in the above invention, the gap is formed so as to be along two opposite sides around the detection unit, and the length of the gap along the two sides is the above 2. It is characterized in that it is longer than the length of the coil pattern in the detection unit along the side.

また、本発明にかかる電流センサは、上記の発明において、前記検出部は、前記空隙以外の部分で前記基板側に接続される接続部を有することを特徴とする。 Further, the current sensor according to the present invention is characterized in that, in the above invention, the detection unit has a connection unit connected to the substrate side at a portion other than the gap.

また、本発明にかかる電流センサは、上記の発明において、前記検出部の一端部は、前記基板の縁部であることを特徴とする。 Further, the current sensor according to the present invention is characterized in that, in the above invention, one end of the detection unit is an edge portion of the substrate.

また、本発明にかかる電流センサは、上記の発明において、前記検出部は、前記一端部に対向する他端部の一部または全部で前記基板側に接続されることを特徴とする。 Further, the current sensor according to the present invention is characterized in that, in the above invention, the detection unit is connected to the substrate side with a part or all of the other end portion facing the one end portion.

また、本発明にかかる電流センサは、上記の発明において、前記接続部は、前記基板の短手方向に設けられることを特徴とする。 Further, the current sensor according to the present invention is characterized in that, in the above invention, the connection portion is provided in the lateral direction of the substrate.

また、本発明にかかる電力量計は、上記の発明のいずれか一つに記載した電流センサが検出した電流量と入力される電圧量とをもとに前記電流バーを流れる電力量を算出することを特徴とする。 Further, the watt hour meter according to the present invention calculates the amount of power flowing through the current bar based on the amount of current detected by the current sensor described in any one of the above inventions and the amount of input voltage. It is characterized by that.

本発明によれば、コイルパターンが形成された検出部の周辺に空隙を設けているので、基板に外力が掛かって歪む場合であっても外力が検出部に伝わりにくくなり、検出部の変形や位置ずれが生じにくいので、電流計測精度の低下を少なくすることができる。 According to the present invention, since a gap is provided around the detection unit in which the coil pattern is formed, even when an external force is applied to the substrate and the substrate is distorted, it becomes difficult for the external force to be transmitted to the detection unit, and the detection unit is deformed or deformed. Since misalignment is unlikely to occur, it is possible to reduce a decrease in current measurement accuracy.

図1は、本発明の実施の形態である電流センサの概要構成を示す斜視図である。FIG. 1 is a perspective view showing a schematic configuration of a current sensor according to an embodiment of the present invention. 図2は、図1に示した基板の平面図である。FIG. 2 is a plan view of the substrate shown in FIG. 図3は、集磁コアの端部間のギャップに介在する検出部の状態を示す断面図である。FIG. 3 is a cross-sectional view showing a state of the detection unit interposed in the gap between the ends of the magnetic collecting core. 図4は、基板の変形に伴う検出部への影響を説明する説明図である。FIG. 4 is an explanatory diagram for explaining the influence on the detection unit due to the deformation of the substrate. 図5は、本発明の実施の形態である電流センサの変形例1を示す基板の平面図である。FIG. 5 is a plan view of a substrate showing a modification 1 of the current sensor according to the embodiment of the present invention. 図6は、本発明の実施の形態である電流センサの変形例2を示す基板の平面図である。FIG. 6 is a plan view of a substrate showing a modification 2 of the current sensor according to the embodiment of the present invention. 図7は、本発明の実施の形態である電流センサの変形例3を示す基板の平面図である。FIG. 7 is a plan view of a substrate showing a modification 3 of the current sensor according to the embodiment of the present invention. 図8は、集磁コアに2つのギャップが形成され、この2つのギャップにそれぞれコイルパターンをもつ検出部を形成した基板の一例を示す平面図である。FIG. 8 is a plan view showing an example of a substrate in which two gaps are formed in the magnetic collecting core and a detection unit having a coil pattern is formed in each of the two gaps. 図9は、集磁コアに2つのギャップが形成され、この2つのギャップにそれぞれコイルパターンをもつ検出部を電流バーに直交する方向から挿入配置する基板の一例を示す平面図である。FIG. 9 is a plan view showing an example of a substrate in which two gaps are formed in the magnetic collecting core, and a detection unit having a coil pattern in each of the two gaps is inserted and arranged from a direction orthogonal to the current bar. 図10は、図9に示した基板が集磁コアの2つのギャップに配置された状態を示す電流センサの概要構成を示す斜視図である。FIG. 10 is a perspective view showing a schematic configuration of a current sensor showing a state in which the substrate shown in FIG. 9 is arranged in two gaps of the magnetic collecting core. 図11は、電流センサを用いた電力量計の構成を示すブロック図である。FIG. 11 is a block diagram showing a configuration of a watt hour meter using a current sensor.

以下、添付図面を参照してこの発明を実施するための形態について説明する。 Hereinafter, embodiments for carrying out the present invention will be described with reference to the accompanying drawings.

図1は、本発明の実施の形態である電流センサ100の概要構成を示す斜視図である。また、図2は、図1に示した基板1の平面図である。さらに、図3は、集磁コア10の端部11間のギャップGに介在する検出部2の状態を示す断面図である。図1〜図3において、電流センサ100は、電流を流す電流バー12と、電流バー12を囲むように形成された集磁コア10と、集磁コア10の端部11間のギャップGに介在されて磁気検出を行うコイルパターン3が設けられ、電流バー12に流れる電流量を検出する基板1とを有する。コイルパターン3は、誘電体の基板1上に形成され、コイルパターンが形成された検出部2の周辺に2つの空隙V1,V2が設けられている。 FIG. 1 is a perspective view showing a schematic configuration of a current sensor 100 according to an embodiment of the present invention. Further, FIG. 2 is a plan view of the substrate 1 shown in FIG. Further, FIG. 3 is a cross-sectional view showing a state of the detection unit 2 interposed in the gap G between the end portions 11 of the magnetic collection core 10. In FIGS. 1 to 3, the current sensor 100 is interposed in a gap G between a current bar 12 through which a current flows, a magnetic collecting core 10 formed so as to surround the current bar 12, and an end portion 11 of the magnetic collecting core 10. A coil pattern 3 for magnetic detection is provided, and a substrate 1 for detecting the amount of current flowing through the current bar 12 is provided. The coil pattern 3 is formed on a dielectric substrate 1, and two voids V1 and V2 are provided around the detection unit 2 on which the coil pattern is formed.

コイルパターン3は、電流バー12を流れる電流の大きさ及び変化に応じて発生するギャップG間の磁束変化を誘導電圧として検出する。コイルパターン3は、基板1上であって、ギャップGを介在しない領域に形成された電流検出回路4に接続される。電流検出回路4は、コイルパターン3から入力された誘導電圧に対してフィルタ処理などを施し、計測目的の周波数成分のみを抽出する処理を行って、電流バー12に流れる電流の計測を行う。 The coil pattern 3 detects a change in magnetic flux between the gaps G generated according to the magnitude and change of the current flowing through the current bar 12 as an induced voltage. The coil pattern 3 is connected to the current detection circuit 4 formed on the substrate 1 in a region not interposing the gap G. The current detection circuit 4 performs a filter process or the like on the induced voltage input from the coil pattern 3 to extract only the frequency component to be measured, and measures the current flowing through the current bar 12.

なお、基板1に設けられた穴5は、基板1を図示しない固定部に取付固定するためのねじ穴である。この基板1の固定によって基板1内の検出部2のコイルパターン3は、ギャップG内の所定位置に固定配置される。 The hole 5 provided in the substrate 1 is a screw hole for mounting and fixing the substrate 1 to a fixing portion (not shown). By fixing the substrate 1, the coil pattern 3 of the detection unit 2 in the substrate 1 is fixedly arranged at a predetermined position in the gap G.

検出部2は、電流検出回路4が設けられる基板1側に対し、接続部21を介して接続される。また、空隙V1,V2の一部は、検出部2の周辺で対向する2辺に沿うように形成され、この2辺に沿った空隙の長さL1は、2辺に沿った検出部2内のコイルパターン3の長さL2よりも長い。なお、図2では、接続部21が形成される辺の一部で基板1側に接続され、空隙V1,V2が接続部21側に回り込んでいる。 The detection unit 2 is connected to the substrate 1 side on which the current detection circuit 4 is provided via the connection unit 21. Further, a part of the gaps V1 and V2 is formed along two opposing sides around the detection unit 2, and the length L1 of the gap along the two sides is inside the detection unit 2 along the two sides. It is longer than the length L2 of the coil pattern 3 of. In FIG. 2, a part of the side where the connecting portion 21 is formed is connected to the substrate 1 side, and the gaps V1 and V2 wrap around to the connecting portion 21 side.

ここで、図3に示すように、ギャップG内に配置されたコイルパターン3は、検出部2が、集磁コア10の端部方向である方向aに移動した場合、ギャップGから外れる方向bに移動した場合、さらには、変形した場合における端部方向に対する面積が変化した場合、検出する磁束が変化し、電流計測精度が低下する。 Here, as shown in FIG. 3, the coil pattern 3 arranged in the gap G has a direction b that deviates from the gap G when the detection unit 2 moves in the direction a that is the end direction of the magnetic collecting core 10. When the area is changed to, or when the area with respect to the end direction in the deformed state is changed, the magnetic flux to be detected changes, and the current measurement accuracy is lowered.

本実施の形態では、検出部2の周辺に空隙V1,V2を設け、検出部2の1辺の一部が接続された接続部21のみで基板1側と接続しているため、基板1全体の変形が検出部2に伝わりにくくなる。この結果、基板1全体に外力が掛かって歪む場合であっても外力が検出部2に伝わりにくくなり、検出部2のコイルパターン3の変形や位置ずれが生じにくくなるので、電流計測精度の低下を少なくすることができる。 In the present embodiment, the gaps V1 and V2 are provided around the detection unit 2, and only the connection portion 21 to which a part of one side of the detection unit 2 is connected is connected to the substrate 1 side, so that the entire substrate 1 is connected. Deformation is less likely to be transmitted to the detection unit 2. As a result, even when an external force is applied to the entire substrate 1 and the substrate 1 is distorted, the external force is less likely to be transmitted to the detection unit 2, and the coil pattern 3 of the detection unit 2 is less likely to be deformed or misaligned. Can be reduced.

ここで、図4を参照して基板1の変形による検出部2への影響について説明する。図4(a)は基板1のA−A線断面図である。図4(a)の状態から、基板1に外力が掛かると、図4(b)に示すように基板1は大きく変形する。しかし、検出部2は、一部の接続部21のみで基板1側に接続されているため、検出部2には、変形による応力の伝達は少ない。すなわち、図4(c)に示すように、基板1本体側は、歪み量が大きい特性曲線LL1を描くが、コイルパターン3が形成された検出部2は歪み量がほとんどない特性曲線LL2を描く。この結果、基板1が大きく変形しても、ギャップGにおける検出部2の配置位置の変化は小さく、コイルパターン3を用いた電流計測精度の低下を抑えることができる。 Here, the influence of the deformation of the substrate 1 on the detection unit 2 will be described with reference to FIG. FIG. 4A is a cross-sectional view taken along the line AA of the substrate 1. When an external force is applied to the substrate 1 from the state of FIG. 4 (a), the substrate 1 is greatly deformed as shown in FIG. 4 (b). However, since the detection unit 2 is connected to the substrate 1 side only by a part of the connection units 21, the stress transmission due to deformation is small to the detection unit 2. That is, as shown in FIG. 4C, the substrate 1 main body side draws a characteristic curve LL1 having a large amount of strain, but the detection unit 2 on which the coil pattern 3 is formed draws a characteristic curve LL2 having almost no amount of strain. .. As a result, even if the substrate 1 is greatly deformed, the change in the arrangement position of the detection unit 2 in the gap G is small, and the decrease in the current measurement accuracy using the coil pattern 3 can be suppressed.

なお、図2に示すように、基板1が矩形で長手方向の幅A2が短手方向の幅A1に比して長い場合、基板1は長手方向の変形が生じやすいため、空隙V1,V2は、少なくとも長手方向に設け、接続部21は短手方向に設けておくことが好ましい。また、検出部2の一端部は、基板1の縁部として自由端とすることが好ましい。これらの構成とすることによって、基板1本体側の変形応力の伝達を小さくすることができる。 As shown in FIG. 2, when the substrate 1 is rectangular and the width A2 in the longitudinal direction is longer than the width A1 in the lateral direction, the substrate 1 is likely to be deformed in the longitudinal direction, so that the gaps V1 and V2 are formed. , At least in the longitudinal direction, and the connecting portion 21 is preferably provided in the lateral direction. Further, it is preferable that one end of the detection unit 2 is a free end as an edge of the substrate 1. With these configurations, it is possible to reduce the transmission of deformation stress on the substrate 1 main body side.

図5は、本発明の実施の形態である電流センサの変形例1を示す基板1の平面図である。この変形例1では、検出部2に対応する検出部2aの周囲に形成された空隙V11,V12は、基板1の短手方向の対向する2辺のみに形成されている。したがって、検出部2aの接続部22は、基板1の縁部に対向する辺側の全部が基板1側に接続される。この構成によっても、検出部2aに対する、基板1本体側の変形応力の伝達を小さくすることができる。 FIG. 5 is a plan view of a substrate 1 showing a modification 1 of the current sensor according to the embodiment of the present invention. In this modification 1, the gaps V11 and V12 formed around the detection unit 2a corresponding to the detection unit 2 are formed only on the two opposite sides of the substrate 1 in the lateral direction. Therefore, all of the connection portions 22 of the detection unit 2a on the side facing the edge portion of the substrate 1 are connected to the substrate 1 side. Also with this configuration, it is possible to reduce the transmission of the deformation stress on the substrate 1 main body side to the detection unit 2a.

なお、この変形例1では、空隙V11,V12の切り欠きを直線的に形成するのみでよいため、製造が容易となる。 In addition, in this modification 1, since it is only necessary to form the notches of the voids V11 and V12 linearly, the production becomes easy.

図6は、本発明の実施の形態である電流センサの変形例2を示す基板1の平面図である。この変形例2では、検出部2に対応する検出部2bの一端部が自由端とならず、基板1の縁部に対して検出部2bの辺の一部が接続された接続部23bを介して接続されている。なお、検出部2bの一端部に対向する接続部23aは、接続部21と同様に1辺の一部のみが基板1側に接続されている。この変形例2でも、検出部2bの周囲に空隙V21,V22が形成され、検出部2bに対する、基板1本体側の変形応力の伝達を小さくすることができる。 FIG. 6 is a plan view of a substrate 1 showing a modification 2 of the current sensor according to the embodiment of the present invention. In this modification 2, one end of the detection unit 2b corresponding to the detection unit 2 does not become a free end, and a part of the side of the detection unit 2b is connected to the edge of the substrate 1 via a connection unit 23b. Is connected. As with the connecting portion 21, only a part of one side of the connecting portion 23a facing one end of the detecting portion 2b is connected to the substrate 1 side. Also in this modification 2, the gaps V21 and V22 are formed around the detection unit 2b, and the transmission of the deformation stress on the substrate 1 main body side to the detection unit 2b can be reduced.

図7は、本発明の実施の形態である電流センサの変形例3を示す基板1の平面図である。この変形例3では、図6に示した検出部2bの構成に対して、さらに長手方向に接続部24c,24dを設けた検出部2cとしている。検出部2cは、検出部2bと同様に、接続部23a,23bに対応した接続部24a,24bを有する。そして、検出部2cは、これらの接続部24a〜24d以外の周囲に4つの空隙V31〜V34を形成している。この変形例3でも、検出部2cの周囲に空隙V31〜V34が形成され、検出部2cに対する、基板1本体側の変形応力の伝達を小さくすることができる。 FIG. 7 is a plan view of a substrate 1 showing a modification 3 of the current sensor according to the embodiment of the present invention. In this modification 3, the detection unit 2c is provided with connecting portions 24c and 24d in the longitudinal direction with respect to the configuration of the detection unit 2b shown in FIG. The detection unit 2c has connection units 24a and 24b corresponding to the connection units 23a and 23b, similarly to the detection unit 2b. Then, the detection unit 2c forms four voids V31 to V34 around the connection portions 24a to 24d. Also in this modification 3, the gaps V31 to V34 are formed around the detection unit 2c, and the transmission of the deformation stress on the substrate 1 main body side to the detection unit 2c can be reduced.

なお、基板1の変形が短手方向に対して大きい場合、接続部は、接続部24c,24dのみとすることが好ましい。すなわち、基板1の変形が大きい方向に空隙を設け、基板1の変形が小さい方向に辺の一部のみを接続することが好ましい。 When the deformation of the substrate 1 is large with respect to the lateral direction, it is preferable that the connecting portions are only the connecting portions 24c and 24d. That is, it is preferable to provide a gap in the direction in which the deformation of the substrate 1 is large and connect only a part of the sides in the direction in which the deformation of the substrate 1 is small.

図8は、集磁コア10に2つのギャップが形成され、この2つのギャップにそれぞれコイルパターンをもつ検出部42a,42bを形成した基板40の一例を示す平面図である。図8に示すように、基板40は、縁部に、検出部2に対応する2つの検出部42a,42bを形成し、それぞれ空隙V1,V2に対応する空隙V41,V42、V43,V44を形成している。この電流センサも、検出部42a,42bの周囲にそれぞれ空隙V41,V42、V43,V44を形成し、検出部42a,42bに対する、基板40本体側の変形応力の伝達を小さくするようにしている。 FIG. 8 is a plan view showing an example of a substrate 40 in which two gaps are formed in the magnetic collecting core 10 and detection units 42a and 42b having coil patterns are formed in the two gaps, respectively. As shown in FIG. 8, the substrate 40 forms two detection units 42a and 42b corresponding to the detection unit 2 at the edge portion, and forms voids V41, V42, V43 and V44 corresponding to the voids V1 and V2, respectively. doing. This current sensor also forms gaps V41, V42, V43, and V44 around the detection units 42a and 42b, respectively, so as to reduce the transmission of deformation stress on the substrate 40 main body side to the detection units 42a and 42b, respectively.

図9は、集磁コア10に2つのギャップが形成され、この2つのギャップにそれぞれコイルパターンをもつ検出部52a,52bを電流バー12に直交する方向から挿入配置する基板50の一例を示す平面図である。図9に示すように、基板50は、2つのギャップ位置に対応した検出部52a,52bを形成している。検出部52aは、基板50の中央部分に設けられ、検出部52bは、基板50の縁部に設けられる。検出部52は、各辺の一部が基板50側に接続された接続部を有し、4つの空隙V51〜V54が形成されている。また、検出部52bは、検出部2と同様に、基板50の縁部に対向する1辺の一部のみが基板50側に接続され、空隙V56,V57が形成されている。この電流センサも、検出部52a,52bの周囲にそれぞれ空隙V51〜V54、V56,V57を形成し、検出部52a,52bに対する、基板50本体側の変形応力の伝達を小さくするようにしている。 FIG. 9 shows an example of a substrate 50 in which two gaps are formed in the magnetic collecting core 10 and detection units 52a and 52b having coil patterns are inserted and arranged in the two gaps from directions orthogonal to the current bar 12. It is a figure. As shown in FIG. 9, the substrate 50 forms detection units 52a and 52b corresponding to the two gap positions. The detection unit 52a is provided at the central portion of the substrate 50, and the detection unit 52b is provided at the edge portion of the substrate 50. The detection unit 52 has a connection unit in which a part of each side is connected to the substrate 50 side, and four voids V51 to V54 are formed. Further, in the detection unit 52b, similarly to the detection unit 2, only a part of one side facing the edge portion of the substrate 50 is connected to the substrate 50 side, and voids V56 and V57 are formed. This current sensor also has voids V51 to V54, V56, and V57 formed around the detection units 52a and 52b, respectively, so as to reduce the transmission of deformation stress on the substrate 50 main body side to the detection units 52a and 52b, respectively.

図10は、図9に示した基板50が集磁コア10の2つのギャップG1,G2に配置された状態を示す電流センサ101の全体構成を示す斜視図である。この電流センサ101は、図10に示すように、集磁コア10が、2つのキャップG1,G2で分割された集磁コア10a,10bからなる。2つの検出部52a,52bを有する基板50は、検出部52a,52bが2つのギャップG1,G2にそれぞれ介在するように配置される。 FIG. 10 is a perspective view showing the overall configuration of the current sensor 101 showing a state in which the substrate 50 shown in FIG. 9 is arranged in the two gaps G1 and G2 of the magnetic collecting core 10. As shown in FIG. 10, the current sensor 101 includes magnetic collecting cores 10a and 10b in which the magnetic collecting core 10 is divided by two caps G1 and G2. The substrate 50 having the two detection units 52a and 52b is arranged so that the detection units 52a and 52b are interposed in the two gaps G1 and G2, respectively.

図11は、上述した電流センサ100(100,101)を用いた電力量計200の構成を示すブロック図である。図11に示すように、電力量計200は、上述した電流センサ100と、電圧センサ201と、電流センサ100の基板1(1,40,50)から出力された電流計測結果と、電圧センサ201から出力された電圧計測結果とをもとに電流バー12の電力量を算出する電力量算出部202と、電力量算出結果を出力する出力部203とを有する。これにより上述した電流センサ100,101を用いて電力量計測を行うことができる。 FIG. 11 is a block diagram showing a configuration of a watt-hour meter 200 using the above-mentioned current sensor 100 (100, 101). As shown in FIG. 11, the electric energy meter 200 includes the above-mentioned current sensor 100, voltage sensor 201, current measurement results output from the substrate 1 (1,40,50) of the current sensor 100, and voltage sensor 201. It has a power amount calculation unit 202 that calculates the power amount of the current bar 12 based on the voltage measurement result output from, and an output unit 203 that outputs the power amount calculation result. As a result, the electric energy can be measured using the above-mentioned current sensors 100 and 101.

1,40,50 基板
2,2a,2b,2c,42a,42b,52a,52b 検出部
3 コイルパターン
4 電流検出回路
5 穴
10,10,10b 集磁コア
11 端部
12 電流バー
21,22,23a,23b,24c,24d,24a,24b,24c,24d 接続部
100,101 電流センサ
200 電力量計
201 電圧センサ
202 電力量算出部
203 出力部
G ギャップ
V1,V2,V11,V12,V31〜V34,V41〜V44,V51〜V57 空隙
1,40,50 Substrates 2,2a, 2b, 2c, 42a, 42b, 52a, 52b Detection unit 3 Coil pattern 4 Current detection circuit 5 Holes 10, 10, 10b Magnetic collecting core 11 End 12 Current bars 21, 22, 23a, 23b, 24c, 24d, 24a, 24b, 24c, 24d Connection unit 100, 101 Current sensor 200 Electric energy meter 201 Voltage sensor 202 Electric energy calculation unit 203 Output unit G Gap V1, V2, V11, V12, V31 to V34 , V41-V44, V51-V57 voids

Claims (5)

電流を流す電流バーと、前記電流バーを囲むように形成された集磁コアと、前記集磁コアのギャップに介在されて磁気検出を行うコイルパターンが設けられ、前記電流バーに流れる電流量を検出する基板とを有した電流センサであって、
前記コイルパターンが形成された矩形領域の検出部は前記基板上に設けられて前記ギャップ内に配置され、前記検出部の一端部は前記基板の短手方向側の縁部であり、少なくとも前記基板の長手方向側に対応する前記検出部の両端部には、該両端部に沿うように前記基板の縁部から切り込まれた空隙が形成されることを特徴とする電流センサ。
A current bar through which a current flows, a magnetic collecting core formed so as to surround the current bar, and a coil pattern for magnetic detection are provided via a gap between the magnetic collecting cores, and the amount of current flowing through the current bar is measured. A current sensor with a board to detect
The detection portion of the rectangular region on which the coil pattern is formed is provided on the substrate and arranged in the gap, and one end of the detection portion is an edge portion on the lateral side of the substrate, and at least the substrate. A current sensor characterized in that gaps cut from the edge portion of the substrate are formed at both ends of the detection portion corresponding to the longitudinal direction side of the substrate.
前記両端部の空隙の長さは、前記コイルパターンの長さよりも長いことを特徴とする請求項に記載の電流センサ。 The length of the gap of said end portion, a current sensor according to claim 1, characterized in that longer than the length of the coil pattern. 前記検出部は、前記一端部に対向する他端部の一部または全部で前記基板側に接続されることを特徴とする請求項1又は2に記載の電流センサ。 The current sensor according to claim 1 or 2 , wherein the detection unit is connected to the substrate side in part or in whole of the other end portion facing the one end portion. 前記検出部は、前記一端部に対向する他端部の一部で前記基板側に接続され、The detection unit is connected to the substrate side with a part of the other end portion facing the one end portion.
前記空隙は、前記検出部の前記他端部に沿うように連続して形成されることを特徴とする請求項1又は2に記載の電流センサ。The current sensor according to claim 1 or 2, wherein the gap is continuously formed along the other end of the detection unit.
請求項1〜のいずれか一つに記載した電流センサが検出した電流量と入力される電圧量とをもとに前記電流バーを流れる電力量を算出することを特徴とする電力量計。 A watt hour meter characterized by calculating the amount of power flowing through the current bar based on the amount of current detected by the current sensor according to any one of claims 1 to 4 and the amount of input voltage.
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