JPH05273321A - Current sensor - Google Patents

Current sensor

Info

Publication number
JPH05273321A
JPH05273321A JP4071749A JP7174992A JPH05273321A JP H05273321 A JPH05273321 A JP H05273321A JP 4071749 A JP4071749 A JP 4071749A JP 7174992 A JP7174992 A JP 7174992A JP H05273321 A JPH05273321 A JP H05273321A
Authority
JP
Japan
Prior art keywords
magnetic field
magnetic
base
detection means
field generator
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.)
Granted
Application number
JP4071749A
Other languages
Japanese (ja)
Other versions
JP3094635B2 (en
Inventor
Shinkichi Shimizu
信吉 清水
Shigemi Kurashima
茂美 倉島
Shigeo Tanji
成生 丹治
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujitsu Ltd
Original Assignee
Fujitsu Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP04071749A priority Critical patent/JP3094635B2/en
Publication of JPH05273321A publication Critical patent/JPH05273321A/en
Application granted granted Critical
Publication of JP3094635B2 publication Critical patent/JP3094635B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Abstract

PURPOSE:To provide a current sensor, in which a magnetic sensor detects the magnetic field induced by the current flowing through a magnetic field generator so that external voltage noises entering the magnetic field generator does not affect the output from the magnetic sensor means of a magnetic detecting means and, at the same time, to and the output from its associated amplifier circuit. CONSTITUTION:The title sensor is provided with a magnetic field generator 10 which generates a magnetic field when a current flows through the generator 10, magnetic detecting means 30 which detects the magnetic field generated by the generator 10, base 20 which is made of a synthetic resin and houses the generator 10 in its lower recessed section 21 and the means 30 in its upper recessed section 22, and a printed board 40 which is mounted with an amplifier circuit 45 for amplifying the output of the means 30 and mounted on the surface of the base 20. A conductive layer 25 connected to a ground potential is formed on the surface of the base 20 including the internal wall of the section 22.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、磁界発生体に流れる電
流により発生する磁界を、磁気抵抗素子の磁気抵抗効果
を利用した磁気検出手段で検出することで、電流を検知
する電流センサに関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a current sensor for detecting a current by detecting a magnetic field generated by a current flowing through a magnetic field generator by a magnetic detecting means utilizing the magnetoresistive effect of a magnetoresistive element. Is.

【0002】上述のような電流センサは、直流の電流検
出ができるので、サーボモータ等の回路に取り入れて、
サーボモータに流れる電流の検出に広く使用されてい
る。
Since the current sensor as described above can detect a direct current, it can be incorporated in a circuit such as a servo motor.
It is widely used to detect the current flowing in servo motors.

【0003】[0003]

【従来の技術】特開平1ー299481号公報記載の従
来例を図5に示す。図5において、1はパーマロイ等の
磁性体の磁気抵抗効果を利用した磁気抵抗素子であり、
2は磁気抵抗素子1の初期磁化方向にバイアス磁界を印
加する永久磁石である。
2. Description of the Related Art FIG. 5 shows a conventional example disclosed in Japanese Patent Laid-Open No. 1-299481. In FIG. 5, reference numeral 1 is a magnetoresistive element utilizing the magnetoresistive effect of a magnetic material such as permalloy,
Reference numeral 2 is a permanent magnet that applies a bias magnetic field in the initial magnetization direction of the magnetoresistive element 1.

【0004】3は電流iを流して検出磁界Hを発生させ
る導体であり、5はパーマロイ等よりなる磁気シールド
容器である。永久磁石2は、磁気抵抗素子1の一方の側
面(図は前面)に固着されており、導体3は永久磁石2
を固着しない磁気抵抗素子1の3方の側面を囲うように
コ字形に形成し配設されている。
Reference numeral 3 is a conductor for flowing a current i to generate a detection magnetic field H, and reference numeral 5 is a magnetic shield container made of permalloy or the like. The permanent magnet 2 is fixed to one side surface (front surface in the figure) of the magnetoresistive element 1, and the conductor 3 is the permanent magnet 2
Are formed and arranged in a U-shape so as to surround the three side surfaces of the magnetoresistive element 1 which does not adhere.

【0005】磁気抵抗素子1の外部リード線4は磁気シ
ールド容器5の下面に設けた貫通孔より導出されて、プ
リント板6に接続されいる。そしてプリント板6のパタ
ーンによりフルブリッジに接続している。なお、このプ
リント板6には、磁気抵抗素子1の出力を増幅する増幅
回路7を設けている。
The external lead wire 4 of the magnetoresistive element 1 is led out from a through hole provided in the lower surface of the magnetic shield container 5 and connected to the printed board 6. And it is connected to the full bridge by the pattern of the printed board 6. The printed board 6 is provided with an amplifier circuit 7 for amplifying the output of the magnetoresistive element 1.

【0006】一方、導体3のリード部3Aも磁気シールド
容器5の下面に設けた貫通孔より導出されている。上述
のように構成された電流センサは、磁気シールド容器5
によりシールドされているので、電流iを導体3に流し
た時に発生する検出磁界Hは、外部磁界に煩わされるこ
となく、磁気抵抗素子1により検出される。
On the other hand, the lead portion 3A of the conductor 3 is also led out from a through hole provided in the lower surface of the magnetic shield container 5. The current sensor configured as described above has the magnetic shield container 5
Since it is shielded by, the detection magnetic field H generated when the current i is passed through the conductor 3 is detected by the magnetoresistive element 1 without being bothered by the external magnetic field.

【0007】[0007]

【発明が解決しようとする課題】ところで、上記従来の
電流センサは、磁界発生体(図5の導体3)に電圧性ノ
イズ(スパイク状)が乗ると、磁界発生体に対向設置さ
れた磁気抵抗素子に電圧性のノイズが乗る。したがっ
て、忠実な電流波形の再現が困難であるという問題点が
あった。
By the way, in the above-mentioned conventional current sensor, when a voltage noise (spike-shaped) is applied to the magnetic field generator (conductor 3 in FIG. 5), the magnetic resistance installed opposite to the magnetic field generator. Voltage noise is added to the element. Therefore, there is a problem that it is difficult to reproduce a faithful current waveform.

【0008】また、外部ノイズが増幅回路に乗るという
問題点があった。本発明はこのような点に鑑みて創作さ
れたもので、磁界発生体に乗った電圧性ノイズに影響さ
れない出力を得ることができ、また増幅回路等に外部ノ
イズが乗る恐れがない電流センサを提供することを目的
としている。
In addition, there is a problem that external noise gets on the amplifier circuit. The present invention has been made in view of the above point, and provides a current sensor that can obtain an output that is not affected by the voltage noise on the magnetic field generator and that does not have external noise on the amplifier circuit or the like. It is intended to be provided.

【0009】[0009]

【課題を解決するための手段】上記の目的を達成するた
めに本発明は、図1に例示したように、電流が流れるこ
とにより磁界を発生する磁界発生体10と、磁界発生体10
が発生する磁界を検出する磁気検出手段30と、下部凹部
21に磁界発生体10を収容し上部凹部22に磁気検出手段30
を収容する合成樹脂よりなる基台20と、磁気検出手段30
の出力を増幅する増幅回路45を有し、基台20の表面に搭
載するプリント板40とを備えたもので、上部凹部22の内
壁を含む基台20の表面にグランド電位に接続された導電
体層25を形成した構造とする。
In order to achieve the above object, the present invention, as illustrated in FIG. 1, includes a magnetic field generator 10 for generating a magnetic field when a current flows, and a magnetic field generator 10.
Magnetic detection means 30 for detecting the magnetic field generated by the
The magnetic field generator 10 is accommodated in 21 and the magnetic detection means 30
A base 20 made of synthetic resin for accommodating the
With a printed circuit board 40 mounted on the surface of the base 20, and a conductive plate connected to the ground potential on the surface of the base 20 including the inner wall of the upper recess 22. The body layer 25 is formed.

【0010】或いは、電流が流れることにより磁界を発
生する磁界発生体10と、磁界発生体10が発生する磁界を
検出する磁気検出手段30と、下部凹部21に磁界発生体10
を収容し、上部凹部22に磁気検出手段30を収容する合成
樹脂よりなる基台20と、磁気検出手段30の出力を増幅す
る増幅回路45を有する基台20の表面に搭載するプリント
板40と、基台20に冠着して、磁気検出手段30及びプリン
ト板40を覆う、グランド電位に接続された金属ケース50
とを、備えた構成とする。
Alternatively, the magnetic field generator 10 that generates a magnetic field when a current flows, the magnetic detection means 30 that detects the magnetic field generated by the magnetic field generator 10, and the magnetic field generator 10 in the lower recess 21.
A base 20 made of synthetic resin for housing the magnetic detection means 30 in the upper recess 22, and a printed board 40 mounted on the surface of the base 20 having an amplification circuit 45 for amplifying the output of the magnetic detection means 30. A metal case 50 that is attached to the base 20 and covers the magnetic detection means 30 and the printed board 40 and is connected to the ground potential.
And are provided.

【0011】或いはまた、金属ケース50と、上部凹部22
の内壁を含む基台20の表面にグランド電位に接続された
導電体層25の両者を備えた構成とする。そしてまた、導
電体層25を、(0.1〜1)KΩ/cmのシート抵抗を有す
る導電性塗料とする。さらにまた、導電体層25がニッケ
ルを導体粉とした導電性塗料とすることが好ましい。
Alternatively, the metal case 50 and the upper recess 22
The surface of the base 20 including the inner wall of is provided with both of the conductor layers 25 connected to the ground potential. Also, the conductor layer 25 is made of a conductive paint having a sheet resistance of (0.1 to 1) KΩ / cm. Furthermore, it is preferable that the conductor layer 25 is a conductive paint containing nickel as conductor powder.

【0012】[0012]

【作用】本発明によれば、磁界発生体と磁気検出手段と
の間に、グランド電位に接続された導電体層を設けてあ
る。したがって磁界発生体に乗った電圧性ノイズは磁気
検出手段に悪影響を及ぼす恐れが少ない。
According to the present invention, the conductor layer connected to the ground potential is provided between the magnetic field generator and the magnetic detecting means. Therefore, the voltage noise on the magnetic field generator is less likely to adversely affect the magnetic detection means.

【0013】また、磁気検出手段及び増幅回路を、グラ
ンド電位に接続された金属ケースで覆うっている。した
がって、外部ノイズが増幅回路及び磁気検出手段に乗る
恐れがない。
Further, the magnetic detecting means and the amplifier circuit are covered with a metal case connected to the ground potential. Therefore, there is no risk of external noises riding on the amplifier circuit and the magnetic detection means.

【0014】一方、実験結果によれば導電体層を(0.1
〜1)KΩ/cmのシート抵抗を有する導電性塗料とする
ことで、電圧性ノイズが規格値以下となる。さらにま
た、導電体層をニッケルを導体粉とした導電性塗料とす
ることで、電圧性ノイズが殆ど無くなるばかりでなく、
導電体層が腐食する恐れがなくなるので、ノイズ侵入防
止が長期間保証される。
On the other hand, according to the experimental results, the conductor layer is (0.1
1) By using a conductive paint having a sheet resistance of KΩ / cm, the voltage noise becomes below the standard value. Furthermore, by making the conductive layer a conductive paint using nickel as a conductive powder, not only is voltage noise almost eliminated, but
Since there is no risk of corrosion of the conductor layer, noise intrusion prevention is guaranteed for a long time.

【0015】[0015]

【実施例】以下図を参照しながら、本発明を具体的に説
明する。なお、全図を通じて同一符号は同一対象物を示
す。
The present invention will be described in detail with reference to the drawings. The same reference numerals denote the same objects throughout the drawings.

【0016】図1は、本発明の実施例の断面図、図2は
本発明を分離した形で示す斜視図、図3は本発明の一部
破断斜視図、図4は導電体層とセンサ特性との関係を示
す図である。
FIG. 1 is a sectional view of an embodiment of the present invention, FIG. 2 is a perspective view showing the present invention in a separated form, FIG. 3 is a partially cutaway perspective view of the present invention, and FIG. 4 is a conductor layer and a sensor. It is a figure which shows the relationship with a characteristic.

【0017】図1〜図3において、10は、電流i を流し
て検出磁界を発生させる平面視コ字形の銅係合金属等よ
りなる磁界発生体である。なお、磁界発生体10の両端に
は、それぞれリード11を取付け、このリード11から検出
する電流を磁界発生体10に取込みようにしている。
In FIGS. 1 to 3, reference numeral 10 denotes a magnetic field generator made of a copper-engaging metal or the like having a U-shape in plan view for generating a detected magnetic field by passing a current i. It should be noted that leads 11 are attached to both ends of the magnetic field generator 10 so that the current detected from the leads 11 is taken into the magnetic field generator 10.

【0018】30は、パーマロイ等の磁性体の磁気抵抗を
利用した磁気抵抗素子等よりなる磁気検出手段であっ
て、4本のリード端子31を取付けてある。20は、下部凹
部21に磁界発生体10を収容し上部凹部22に磁気検出手段
30を収容するブロック状の合成樹脂よりなる基台であ
る。
Reference numeral 30 is a magnetic detecting means composed of a magnetoresistive element or the like utilizing the magnetic resistance of a magnetic material such as permalloy, and has four lead terminals 31 attached thereto. Reference numeral 20 denotes a magnetic field generator 10 housed in the lower recess 21 and magnetic detection means in the upper recess 22.
A base made of block-shaped synthetic resin that accommodates 30.

【0019】基台20の材料は、耐熱性, 耐溶剤性に優れ
た例えばポリブチレンテレフタレート等である。そし
て、基台20の上部凹部22の内壁を含む基台20の表面にグ
ランド電位に接続された導電体層25を形成している。
The material of the base 20 is, for example, polybutylene terephthalate having excellent heat resistance and solvent resistance. Then, a conductor layer 25 connected to the ground potential is formed on the surface of the base 20 including the inner wall of the upper recess 22 of the base 20.

【0020】導電体層25の材料は、金属テープ、ニッケ
ル塗装(ニッケルを導体粉とした導電性塗料)、銅塗装
(銅を導体粉とした導電性塗料), カーボン塗装, 金属
溶射, めっき等が考えられる。しかし、図4に矢印P2
で図示したように、ニッケル塗装( ニッケルーポリエス
テル系導電性塗料) が最も好ましい。
The material of the conductor layer 25 is metal tape, nickel coating (conductive coating with nickel as conductor powder), copper coating (conductive coating with copper as conductor powder), carbon coating, metal spraying, plating, etc. Can be considered. However, the arrow P 2 in FIG. 4
As shown in Figure 2, nickel coating (nickel-polyester conductive coating) is most preferable.

【0021】40は、表面に増幅回路45を設けたプリント
板であって、裏面の殆ど全面にアースパターン41を設け
ている。なおこのアースパターン41は、プリント板40の
端部に配設した入出力端子49の選択した数本に接続さ
れ、入出力端子49を介して接地されている。
Reference numeral 40 is a printed board having an amplifier circuit 45 on the front surface thereof, and a ground pattern 41 is provided on almost the entire back surface. The ground pattern 41 is connected to selected several input / output terminals 49 arranged at the end of the printed board 40 and is grounded via the input / output terminals 49.

【0022】なお、総ての入出力端子49は基台20を貫通
して、基台20の下方に導出されている。磁気検出手段30
は、プリント板40の裏面側に配置され、リード端子31が
スルーホールに半田付けされることで、プリント板40に
搭載されている。
All the input / output terminals 49 penetrate the base 20 and are led out below the base 20. Magnetic detection means 30
Is arranged on the back surface side of the printed board 40 and is mounted on the printed board 40 by soldering the lead terminals 31 to the through holes.

【0023】4 本のリード端子31は、プリント板40のパ
ターンによりフルブリッジに接続され、その後増幅回路
45により増幅され、最終的には選択した入出力端子49に
接続されている。
The four lead terminals 31 are connected to the full bridge by the pattern of the printed board 40, and then the amplifier circuit
It is amplified by 45 and finally connected to the selected input / output terminal 49.

【0024】50は、鋼, アルミニウム, 銅板, パーマロ
イ等より下部が開口した箱形の金属ケースである。しか
し、外部電気性ノイズばかりでなく外部磁界からもシー
ルドするには、パーマロイが好ましい。
Reference numeral 50 designates a box-shaped metal case whose lower portion is opened from steel, aluminum, copper plate, permalloy or the like. However, permalloy is preferred for shielding not only external electrical noise but also external magnetic fields.

【0025】そして、図3に図示したように、磁界発生
体10を基台20の下部凹部21に埋設し、磁気検出手段30が
上部凹部22に挿入するようにプリント板40を位置合わせ
して、基台20の表面に密着させて取付け、さらに金属ケ
ース50を基台20に嵌着して前述の構成部品をアセンブリ
している。
Then, as shown in FIG. 3, the magnetic field generator 10 is embedded in the lower recess 21 of the base 20, and the printed board 40 is aligned so that the magnetic detecting means 30 is inserted into the upper recess 22. The base 20 is attached in close contact with the surface of the base 20, and the metal case 50 is fitted on the base 20 to assemble the above-described components.

【0026】したがって、電流iが磁界発生体10に流れ
ると、磁界発生体10に磁界が発生しその磁界を磁気検出
手段30が検出する。そして、増幅回路45がその出力を増
幅した後に、入出力端子49から外部に取り出すことがで
きる。
Therefore, when the current i flows through the magnetic field generator 10, a magnetic field is generated in the magnetic field generator 10, and the magnetic field detecting means 30 detects the magnetic field. Then, after the output is amplified by the amplifier circuit 45, it can be taken out from the input / output terminal 49 to the outside.

【0027】本発明は上述のように、磁界発生体10と磁
気検出手段30との間に、接地される導電体層25を設けて
あるので、磁界発生体10に乗った電圧性ノイズが磁気検
出手段30に乗る恐れがない。
As described above, according to the present invention, since the grounded conductor layer 25 is provided between the magnetic field generator 10 and the magnetic detecting means 30, the voltage noise on the magnetic field generator 10 is magnetic. There is no fear of getting on the detection means 30.

【0028】また、磁気検出手段30及び増幅回路45を、
導電体層25を介して接地された金属ケース50で覆うてい
るので、外部ノイズが増幅回路45及び磁気検出手段30に
乗る恐れがない。
Further, the magnetic detection means 30 and the amplification circuit 45 are
Since it is covered with the metal case 50 which is grounded via the conductor layer 25, there is no fear that external noise will get on the amplifier circuit 45 and the magnetic detection means 30.

【0029】図4は、横軸に導電体層の抵抗値(Ω/2c
m)をとり、縦軸に出力側の電圧ノイズ(Vpp)とスリュ
ーレート(V/μs)をとった、導電体層とセンサ特性
との関係を示す図である。
In FIG. 4, the horizontal axis represents the resistance value (Ω / 2c) of the conductor layer.
m) is taken, and the vertical axis represents the voltage noise (Vpp) on the output side and the slew rate (V / μs), showing the relationship between the conductor layer and the sensor characteristics.

【0030】図4で導電体層の抵抗値と電圧ノイズとの
関係は実線の曲線で示し、導電体層の抵抗値とスリュー
レートとの関係は点線の曲線で示している。なお、電圧
ノイズの規格値は 0.1 Vpp以下であり、スリューレート
の規格値は0.8 V/μs以上である。
In FIG. 4, the relationship between the resistance value of the conductor layer and the voltage noise is shown by the solid curve, and the relationship between the resistance value of the conductor layer and the slew rate is shown by the dotted curve. The standard value of voltage noise is 0.1 Vpp or less, and the standard value of slew rate is 0.8 V / μs or more.

【0031】そして、図4によれば、電圧性ノイズ及び
スリューレートの規格値をクリアする導電体層の抵抗値
は(0.2 〜2)KΩ/2 cmである。図4において、矢印
は導電体層の種別を示し、矢印P1 は銅箔の金属テー
プ、矢印P2 はニッケル塗装(ニッケルーポリエステル
系導電性塗料) 、矢印P3 はカーボン塗装をそれぞれ示
す。
According to FIG. 4, the resistance value of the conductor layer that clears the standard values of the voltage noise and the slew rate is (0.2 to 2) KΩ / 2 cm. In FIG. 4, the arrow indicates the type of the conductor layer, the arrow P 1 indicates a metal foil of copper foil, the arrow P 2 indicates nickel coating (nickel-polyester conductive coating), and the arrow P 3 indicates carbon coating.

【0032】即ち、矢印P2 で示すニッケル塗装(ニッ
ケルーポリエステル系導電性塗料)は、抵抗値が10KΩ
/2 cmであり、その電圧性ノイズはほぼ 0.02Vpp、スリ
ューレートは約2.0 V/μsである。
That is, the nickel coating (nickel-polyester conductive coating) indicated by the arrow P 2 has a resistance value of 10 KΩ.
The voltage noise is about 0.02 Vpp, and the slew rate is about 2.0 V / μs.

【0033】したがって、導電体層はニッケル塗装が最
も望ましい。また、ニッケル塗装とすることで、導電体
層が腐食する恐れがなくなるので、ノイズ侵入防止が長
期間保証される。
Therefore, nickel coating is most desirable for the conductor layer. Further, the nickel coating eliminates the risk of corrosion of the conductor layer, so that noise intrusion prevention is guaranteed for a long time.

【0034】[0034]

【発明の効果】以上説明したように本発明の電流センサ
は、検出される出力が、磁界発生体に乗った電圧性ノイ
ズに影響されず、また、外部の電圧性ノイズが磁気検出
手段及び増幅回路に乗る恐れがないという優れた特性を
備えている。
As described above, in the current sensor of the present invention, the detected output is not affected by the voltage noise carried on the magnetic field generator, and external voltage noise is detected by the magnetic detection means and the amplifier. It has the excellent characteristics of not getting on the circuit.

【図面の簡単な説明】[Brief description of drawings]

【図1】 本発明の実施例の断面図FIG. 1 is a sectional view of an embodiment of the present invention.

【図2】 本発明を分離した形で示す斜視図FIG. 2 is a perspective view showing the present invention in a separated form.

【図3】 本発明の一部破断斜視図FIG. 3 is a partially cutaway perspective view of the present invention.

【図4】 導電体層とセンサ特性との関係を示す図FIG. 4 is a diagram showing a relationship between a conductor layer and sensor characteristics.

【図5】 従来例の構成図FIG. 5 is a block diagram of a conventional example

【符号の説明】[Explanation of symbols]

1 磁気抵抗素子 2 永久磁石 3 導体 5 磁気シールド容器 7,45 増幅回路 10 磁界発生体 20 基台 21 下部凹部 22 上部凹部 25 導電体層 31 リード端子 40 プリント板 41 アースパターン 49 入出力端子 50 金属ケース 1 Magnetoresistive element 2 Permanent magnet 3 Conductor 5 Magnetic shield container 7,45 Amplification circuit 10 Magnetic field generator 20 Base 21 Lower recess 22 Upper recess 25 Conductor layer 31 Lead terminal 40 Printed board 41 Ground pattern 49 I / O terminal 50 Metal Case

Claims (5)

【特許請求の範囲】[Claims] 【請求項1】 電流が流れることにより磁界を発生する
磁界発生体(10)と、 該磁界発生体(10)が発生する磁界を検出する磁気検出手
段(30)と、 下部凹部(21)に該磁界発生体(10)を収容し上部凹部(22)
に該磁気検出手段(30)を収容する基台(20)と、 該磁気検出手段(30)の出力を増幅する増幅回路(45)を設
けた、該基台(20)の表面に搭載するプリント板(40)とを
備え、 該上部凹部(22)の内壁を含む該基台(20)の表面にグラン
ド電位に接続された、導電体層(25)が形成されてなるこ
とを特徴とする電流センサ。
1. A magnetic field generator (10) for generating a magnetic field when an electric current flows, a magnetic detection means (30) for detecting a magnetic field generated by the magnetic field generator (10), and a lower recess (21). An upper concave portion (22) accommodating the magnetic field generator (10)
A base (20) for accommodating the magnetic detection means (30) and an amplifier circuit (45) for amplifying the output of the magnetic detection means (30) are provided and mounted on the surface of the base (20). A printed board (40), and a conductor layer (25) connected to a ground potential formed on the surface of the base (20) including the inner wall of the upper recess (22). Current sensor to do.
【請求項2】 電流が流れることにより磁界を発生する
磁界発生体(10)と、 該磁界発生体(10)が発生する磁界を検出する磁気検出手
段(30)と、 下部凹部(21)に該磁界発生体(10)を収容し、上部凹部(2
2)に該磁気検出手段(30)を収容する基台(20)と、 該磁気検出手段(30)の出力を増幅する増幅回路(45)を設
けた、該基台(20)の表面に搭載するプリント板(40)と、 該基台(20)に冠着して、該磁気検出手段(30)及び該プリ
ント板(40)を覆う、グランド電位に接続された金属ケー
ス(50)とを、備えたことを特徴とする電流センサ。
2. A magnetic field generator (10) for generating a magnetic field when an electric current flows, a magnetic detection means (30) for detecting a magnetic field generated by the magnetic field generator (10), and a lower recess (21). The magnetic field generator (10) is accommodated in the upper recess (2
A base (20) for accommodating the magnetic detection means (30) in 2) and an amplification circuit (45) for amplifying the output of the magnetic detection means (30) are provided on the surface of the base (20). A printed board (40) to be mounted, and a metal case (50), which is attached to the base (20) and covers the magnetic detection means (30) and the printed board (40) and is connected to the ground potential. A current sensor characterized in that
【請求項3】 電流が流れることにより磁界を発生する
磁界発生体(10)と、 該磁界発生体(10)が発生する磁界を検出する磁気検出手
段(30)と、 下部凹部(21)に該磁界発生体(10)を収容し、上部凹部(2
2)に該磁気検出手段(30)を収容する基台(20)と、 該磁気検出手段(30)の出力を増幅する増幅回路(45)を設
けた、該基台(20)の表面に搭載するプリント板(40)と、 該基台(20)に冠着して、該磁気検出手段(30)及び該プリ
ント板(40)を覆う、グランド電位に接続された金属ケー
ス(50)とを備え、 該上部凹部(22)の内壁を含む該基台(20)の表面にグラン
ド電位に接続された、導電体層(25)が形成されてなるこ
とを特徴とする電流センサ。
3. A magnetic field generator (10) for generating a magnetic field when an electric current flows, magnetic detection means (30) for detecting a magnetic field generated by the magnetic field generator (10), and a lower recess (21). The magnetic field generator (10) is accommodated in the upper recess (2
A base (20) for accommodating the magnetic detection means (30) in 2) and an amplification circuit (45) for amplifying the output of the magnetic detection means (30) are provided on the surface of the base (20). A printed board (40) to be mounted, and a metal case (50), which is attached to the base (20) and covers the magnetic detection means (30) and the printed board (40) and is connected to the ground potential. And a conductor layer (25) connected to a ground potential on the surface of the base (20) including the inner wall of the upper recess (22).
【請求項4】 導電体層(25)が、(0.1〜1)KΩ/cm
のシート抵抗を有する導電性塗料であることを特徴とす
る請求項1又は請求項3記載の電流センサ。
4. The conductive layer (25) is (0.1 to 1) KΩ / cm.
4. The current sensor according to claim 1, wherein the current sensor is a conductive paint having sheet resistance.
【請求項5】 導電体層(25)がニッケルを導体粉とした
導電性塗料であることを特徴とする請求項1又は請求項
3記載の電流センサ。
5. The current sensor according to claim 1 or 3, wherein the conductor layer (25) is a conductive paint containing nickel as a conductor powder.
JP04071749A 1992-03-30 1992-03-30 Current sensor Expired - Fee Related JP3094635B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP04071749A JP3094635B2 (en) 1992-03-30 1992-03-30 Current sensor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP04071749A JP3094635B2 (en) 1992-03-30 1992-03-30 Current sensor

Publications (2)

Publication Number Publication Date
JPH05273321A true JPH05273321A (en) 1993-10-22
JP3094635B2 JP3094635B2 (en) 2000-10-03

Family

ID=13469494

Family Applications (1)

Application Number Title Priority Date Filing Date
JP04071749A Expired - Fee Related JP3094635B2 (en) 1992-03-30 1992-03-30 Current sensor

Country Status (1)

Country Link
JP (1) JP3094635B2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8466698B2 (en) 2010-02-26 2013-06-18 Denso Corporation Current sensor
JP2014092478A (en) * 2012-11-05 2014-05-19 Alps Green Devices Co Ltd Current sensor
WO2019038964A1 (en) * 2017-08-21 2019-02-28 株式会社村田製作所 Current sensor

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2023043550A (en) 2021-09-16 2023-03-29 株式会社東芝 current detector

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8466698B2 (en) 2010-02-26 2013-06-18 Denso Corporation Current sensor
JP2014092478A (en) * 2012-11-05 2014-05-19 Alps Green Devices Co Ltd Current sensor
WO2019038964A1 (en) * 2017-08-21 2019-02-28 株式会社村田製作所 Current sensor
CN111033276A (en) * 2017-08-21 2020-04-17 株式会社村田制作所 Current sensor
CN111033276B (en) * 2017-08-21 2022-02-22 株式会社村田制作所 Current sensor

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