JPH09243667A - Current detector - Google Patents

Current detector

Info

Publication number
JPH09243667A
JPH09243667A JP8055719A JP5571996A JPH09243667A JP H09243667 A JPH09243667 A JP H09243667A JP 8055719 A JP8055719 A JP 8055719A JP 5571996 A JP5571996 A JP 5571996A JP H09243667 A JPH09243667 A JP H09243667A
Authority
JP
Japan
Prior art keywords
cap
magnetic core
magnetic
conversion element
magnetoelectric conversion
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.)
Pending
Application number
JP8055719A
Other languages
Japanese (ja)
Inventor
Yoshihiro Sato
義弘 佐藤
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP8055719A priority Critical patent/JPH09243667A/en
Publication of JPH09243667A publication Critical patent/JPH09243667A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K3/00—Apparatus or processes for manufacturing printed circuits
    • H05K3/22—Secondary treatment of printed circuits
    • H05K3/28—Applying non-metallic protective coatings
    • H05K3/284—Applying non-metallic protective coatings for encapsulating mounted components

Landscapes

  • Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)

Abstract

PROBLEM TO BE SOLVED: To enable highly reliable detection by providing a cap covering a magnetoelectric conversion element on a substrate, bringing an upper face of the cap into contact with an end of a magnetic core and coating the upper face and the magnetic core with coating resin. SOLUTION: A closed magnetic field of current flowing to a current detection coil 3 is formed of a magnetic core 2, and magnetic flux density proportional to the current flowing to the coil 3 is applied to a magnetoelectric conversion element 4 on a circuit substrate 1 corresponding to a magnetic gap between both ends of the magnetic field. The element 4 generates Hall voltage in proportion to this, and after function is adjusted by an amplification circuit 5 and an electronic part 6, the voltage is output outside by a connection lead 7. A cap 11 with a lower face made of resin opened is provided on the substrate 1 to cover the element 4, and its upper face is brought into contact with the core 2, so that the element 4 is protected against stress of coating resin 12 covering the upper face and the core 2. With this constitution, the stress of the coating resin 12 may not be directly applied to the element 4, thereby improving reliability.

Description

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

【０００１】[0001]

【発明の属する技術分野】本発明は、電流線を流れる電
流の大きさを検出する電流検出装置に関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a current detecting device for detecting the magnitude of a current flowing through a current line.

【０００２】[0002]

【従来の技術】近年、モーター制御の高精度化や電力節
減のため、モーターを流れる電流の高精度検出が必須事
項となってきたこと、また、情報通信分野拡大により、
電話回線での着信検出需要の増大等により、高精度・高
安定・高信頼性の電流検出装置が、重要な電子部品とし
て要望されている。以下に、従来の電流検出装置につい
て図２を参照しながら説明する。図２（ａ）は従来の電
流検出装置の斜視図であり、（ｂ）は断面図である。2. Description of the Related Art In recent years, in order to improve the accuracy of motor control and to save electric power, it has become essential to detect the current flowing through the motor with high accuracy.
Due to an increase in demand for incoming call detection on a telephone line, a highly accurate, highly stable and highly reliable current detection device has been demanded as an important electronic component. Hereinafter, a conventional current detecting device will be described with reference to FIG. FIG. 2A is a perspective view of a conventional current detection device, and FIG. 2B is a sectional view.

【０００３】図２において、１は回路基板で、装置を構
成する回路素子を搭載接続する。２は磁気コアで、電流
検出コイル３に流れる電流の閉磁界を構成し、磁電変換
素子４に、電流検出コイル３に流れる電流に比例した磁
束密度を与える。磁電変換素子４は、電流検出コイル３
に流れる電流に比例したホール電圧を発生し、増幅回路
５と電子部品６で構成される回路により、オフセット電
圧調整、及び所定の値に増幅するなどの信号処理（以
下、機能調整という）が行われ、その出力信号が接続リ
ード７を介して外部に出力される。増幅回路５と電子部
品６との電気的な接続は、厚膜導体１０によってなされ
ている。また、電流検出コイル３と回路基板１との接続
は、半田付けランド８に、半田９を用いて接続、固定し
ている。この電流検出装置に、エポキシ変性フェノール
樹脂などの外装樹脂１２を全体に塗布した後硬化させ、
装置を完成させている。In FIG. 2, reference numeral 1 denotes a circuit board on which circuit elements constituting the device are mounted and connected. A magnetic core 2 constitutes a closed magnetic field of the current flowing through the current detection coil 3, and gives the magnetoelectric conversion element 4 a magnetic flux density proportional to the current flowing through the current detection coil 3. The magnetoelectric conversion element 4 is the current detection coil 3
Generates a Hall voltage that is proportional to the current flowing through the circuit, and performs signal processing such as offset voltage adjustment and amplification to a predetermined value (hereinafter referred to as function adjustment) by a circuit composed of the amplifier circuit 5 and the electronic component 6. The output signal is output to the outside via the connection lead 7. The thick film conductor 10 electrically connects the amplifier circuit 5 and the electronic component 6. The current detection coil 3 and the circuit board 1 are connected and fixed to the soldering land 8 by using solder 9. The current detecting device is coated with an exterior resin 12 such as an epoxy-modified phenol resin over the entire surface and then cured,
The device is completed.

【０００４】[0004]

【発明が解決しようとする課題】上記従来の構成におい
ては、電流検出装置として、回路基板１に装置を構成す
るための部品を搭載し機能調整を行った後、外装樹脂１
２を、装置全体に塗布し、硬化させるため、磁電変換素
子４には、外装樹脂１２の硬化収縮時の応力が加わり、
その結果として磁電変換素子４のオフセット電圧、感度
などの特性が変化してしまうため、装置としての信頼性
も低下してしまうという問題を有していた。In the above-mentioned conventional structure, the exterior resin 1 is mounted on the circuit board 1 as a current detecting device after the components for configuring the device are mounted and the functions thereof are adjusted.
Since 2 is applied to the entire apparatus and cured, stress is applied to the magnetoelectric conversion element 4 when the exterior resin 12 is cured and contracted,
As a result, the characteristics such as the offset voltage and the sensitivity of the magnetoelectric conversion element 4 change, so that there is a problem in that the reliability of the device also decreases.

【０００５】そこで本発明は、高信頼性の電流検出装置
を提供することを目的とするものである。Therefore, an object of the present invention is to provide a highly reliable current detecting device.

【０００６】[0006]

【課題を解決するための手段】そしてこの目的を達成す
るために本発明は、磁電変換素子を覆うキャップを基板
上に設けることにより磁電変換素子に外装樹脂の応力が
加わらない構造とし、これにより所期の目的を達成する
ものである。In order to achieve this object, the present invention has a structure in which a cap for covering the magnetoelectric conversion element is provided on the substrate so that the stress of the exterior resin is not applied to the magnetoelectric conversion element. It achieves the intended purpose.

【０００７】[0007]

【発明の実施の形態】本発明の請求項１に記載の発明
は、回路基板と、この回路基板に植設されるとともに、
前記回路基板上においてその両端間で磁気ギャップを形
成した磁気コアと、前記磁気コアの中部に巻回された電
流検出コイルと、前記磁気コアの磁気ギャップに対応す
る回路基板上に実装された磁電変換素子とを備え、前記
磁電変換素子を覆うキャップを基板上に設けるととも
に、このキャップの上面を磁気コアの一端と当接させ、
このキャップの上面および磁気コアを外装樹脂で覆った
ものであり、キャップにより外装樹脂による応力が磁電
変換素子に加わらなくなるので、信頼性の高いものとな
る。またキャップの上面を磁気コアの一端と当接させて
いるので、磁気コアの一端と磁電変換素子との距離も変
動せず、この点からも信頼性の高いものとなる。BEST MODE FOR CARRYING OUT THE INVENTION The invention according to claim 1 of the present invention is a circuit board, which is implanted in the circuit board,
A magnetic core having a magnetic gap formed between its two ends on the circuit board, a current detection coil wound around the center of the magnetic core, and a magnetoelectric device mounted on the circuit board corresponding to the magnetic gap of the magnetic core. A conversion element, and a cap for covering the magnetoelectric conversion element is provided on the substrate, and an upper surface of the cap is brought into contact with one end of the magnetic core,
The upper surface of the cap and the magnetic core are covered with an exterior resin, and the cap prevents stress from the exterior resin from being applied to the magnetoelectric conversion element, resulting in high reliability. Further, since the upper surface of the cap is in contact with one end of the magnetic core, the distance between the one end of the magnetic core and the magnetoelectric conversion element does not change, and the reliability is high in this respect as well.

【０００８】また本発明の請求項２の発明は、キャップ
を、下面が開口した半球状とした請求項１記載の電流検
出装置であって、キャップとしての強度が高くしかも回
路基板上に実装しやすいものとなる。The invention according to claim 2 of the present invention is the current detecting device according to claim 1 in which the cap has a hemispherical shape with an open lower surface, and the cap has high strength and is mounted on a circuit board. It will be easy.

【０００９】さらに本発明の請求項３の発明は、キャッ
プを、磁気コアの一端に接着した請求項１または２記載
の電流検出装置であって、外装樹脂を設ける際等にキャ
ップが回路基板上でずれることがなくなる。Further, the invention according to claim 3 of the present invention is the current detecting device according to claim 1 or 2, wherein the cap is bonded to one end of the magnetic core, wherein the cap is provided on the circuit board when an exterior resin is provided. It will not slip out.

【００１０】以下、本発明の一実施形態について、図面
を参照しながら説明する。図１は、本発明の一実施形態
を示す図で、（ａ）はその構成を示す斜視図、（ｂ）は
断面図である。An embodiment of the present invention will be described below with reference to the drawings. 1A and 1B are views showing an embodiment of the present invention, FIG. 1A is a perspective view showing the configuration, and FIG. 1B is a sectional view.

【００１１】図１において、１は回路基板で、装置を構
成する回路素子を搭載接続する。２は略ロの字状となっ
た磁気コアで、その中部に巻回された電流検出コイル３
に流れる電流の閉磁界を構成し、その両端間の磁気ギャ
ップに対応する回路基板１上に設けた磁電変換素子４
に、電流検出コイル３に流れる電流に比例した磁束密度
を与える。磁電変換素子４は、電流検出コイル３に流れ
る電流に比例したホール電圧を発生し、増幅回路５と電
子部品６で構成される回路により、機能調整を行った
後、信号を接続リード７によって外部に出力する。１１
は磁電変換素子４を外装樹脂１２の応力から保護するた
めの樹脂製で、下面が開口した半球状のキャップで、磁
電変換素子４を覆うごとく回路基板１上に実装されると
ともに、その上面は磁気コア２の一端に当接している。
なお、磁電変換素子４は上面が、磁気コア２の一端面と
垂直となる様に配置されると、感度が最大となるのでそ
のように設けられている。また増幅回路５と電子部品６
との電気的な接続は、厚膜導体１０によってなされてい
る。また、電流検出コイル３と回路基板１との接続は、
半田付けランド８に、半田９を用いて接続、固定してい
る。この電流検出装置に、エポキシ変性フェノール樹脂
などの外装樹脂１２を全体に塗布した後硬化し、装置を
完成している。In FIG. 1, reference numeral 1 denotes a circuit board on which circuit elements constituting the device are mounted and connected. Reference numeral 2 is a substantially square-shaped magnetic core, and the current detection coil 3 is wound around the magnetic core.
Magnetoelectric conversion element 4 provided on the circuit board 1 corresponding to the magnetic gap between both ends of the closed magnetic field of the current flowing in the
, A magnetic flux density proportional to the current flowing through the current detection coil 3 is given. The magnetoelectric conversion element 4 generates a Hall voltage that is proportional to the current flowing in the current detection coil 3, and after the function adjustment is performed by the circuit composed of the amplification circuit 5 and the electronic component 6, the signal is externally transmitted by the connection lead 7. Output to. 11
Is a resin for protecting the magnetoelectric conversion element 4 from the stress of the exterior resin 12, and is a hemispherical cap having an open lower surface, which is mounted on the circuit board 1 so as to cover the magnetoelectric conversion element 4, and its upper surface is It is in contact with one end of the magnetic core 2.
Note that the magnetoelectric conversion element 4 is provided in such a manner that the sensitivity is maximized when the upper surface is arranged to be perpendicular to the one end surface of the magnetic core 2. Further, the amplifier circuit 5 and the electronic component 6
The thick film conductor 10 makes electrical connection with. Further, the connection between the current detection coil 3 and the circuit board 1 is
The soldering lands 8 are connected and fixed with solder 9. An exterior resin 12 such as an epoxy-modified phenol resin is applied to the entire current detection device and then cured to complete the device.

【００１２】以上のように構成された電流検出装置につ
いて、以下にその動作について説明する。The operation of the current detecting device configured as described above will be described below.

【００１３】まず、電流検出コイル３に電流が流れる
と、その電流の大きさに比例した密度の磁束が発生し、
磁気コア２は、発生した磁束により、内部に磁気閉ルー
プを形成する。次に、磁気コア２に発生した磁気閉ルー
プの磁束密度を、そのギャップ部に配置した磁電変換素
子４を用いて、磁束密度に比例したホール電圧に変換す
る。次に、磁電変換素子４でホール電圧に変換された信
号を、使用する外部機器の用途に合わせて、増幅回路５
と電子部品６により信号処理する。この処理された信号
を、接続リード７を用いて外部に出力している。また接
続リード７は、増幅回路５及び電子部品６に電源を供給
するための役割も兼ねている。First, when a current flows through the current detection coil 3, a magnetic flux having a density proportional to the magnitude of the current is generated,
The magnetic core 2 forms a magnetic closed loop inside due to the generated magnetic flux. Next, the magnetic flux density of the magnetic closed loop generated in the magnetic core 2 is converted into a Hall voltage proportional to the magnetic flux density by using the magnetoelectric conversion element 4 arranged in the gap portion. Next, the signal converted into the Hall voltage by the magnetoelectric conversion element 4 is amplified by the amplifier circuit 5 according to the application of the external device to be used.
And the electronic component 6 performs signal processing. The processed signal is output to the outside using the connection lead 7. The connection lead 7 also serves to supply power to the amplifier circuit 5 and the electronic component 6.

【００１４】[0014]

【発明の効果】以上のように、本発明の電流検出装置
は、回路基板と、この回路基板に植設されるとともに、
前記回路基板上においてその両端間で磁気ギャップを形
成した磁気コアと、前記磁気コアの中部に巻回された電
流検出コイルと、前記磁気コアの磁気ギャップに対応す
る回路基板上に実装された磁電変換素子とを備え、前記
磁電変換素子を覆うキャップを基板上に設けるととも
に、このキャップの上面を磁気コアの一端と当接させ、
このキャップの上面および磁気コアを外装樹脂で覆った
ものであり、キャップにより外装樹脂による応力が磁電
変換素子に加わらなくなるので、信頼性の高いものとな
る。またキャップの上面を磁気コアの一端と当接させて
いるので、磁気コアの一端と磁電変換素子との距離も変
動せず、この点からも信頼性の高いものとなる。As described above, the current detecting device of the present invention is provided with a circuit board, which is embedded in the circuit board.
A magnetic core having a magnetic gap formed between its two ends on the circuit board, a current detection coil wound around the center of the magnetic core, and a magnetoelectric device mounted on the circuit board corresponding to the magnetic gap of the magnetic core. A conversion element, and a cap for covering the magnetoelectric conversion element is provided on the substrate, and an upper surface of the cap is brought into contact with one end of the magnetic core,
The upper surface of the cap and the magnetic core are covered with an exterior resin, and the cap prevents stress from the exterior resin from being applied to the magnetoelectric conversion element, resulting in high reliability. Further, since the upper surface of the cap is in contact with one end of the magnetic core, the distance between the one end of the magnetic core and the magnetoelectric conversion element does not change, and the reliability is high in this respect as well.

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

【図１】（ａ），（ｂ）は本発明の一実施形態における
電流検出装置の斜視図及び断面図1A and 1B are a perspective view and a sectional view of a current detection device according to an embodiment of the present invention.

【図２】（ａ），（ｂ）は従来の電流検出装置の斜視図
及び断面図2A and 2B are a perspective view and a sectional view of a conventional current detection device.

【符号の説明】[Explanation of symbols]

１ 回路基板 ２ 磁気コア ３ 電流検出コイル ４ 磁電変換素子 ５ 増幅回路 ６ 電子部品 ７ 接続リード ８ 半田付けランド ９ 半田 １０ 厚膜導体 １１ キャップ １２ 外装樹脂 DESCRIPTION OF SYMBOLS 1 Circuit board 2 Magnetic core 3 Current detection coil 4 Magnetoelectric conversion element 5 Amplification circuit 6 Electronic component 7 Connection lead 8 Soldering land 9 Solder 10 Thick film conductor 11 Cap 12 Exterior resin

Claims (3)

【特許請求の範囲】[Claims] 【請求項１】 回路基板と、この回路基板に植設される
とともに、前記回路基板上においてその両端間で磁気ギ
ャップを形成した磁気コアと、前記磁気コアの中部に巻
回された電流検出コイルと、前記磁気コアの磁気ギャッ
プに対応する回路基板上に実装された磁電変換素子とを
備え、前記磁電変換素子を覆うキャップを基板上に設け
るとともに、このキャップの上面を磁気コアの一端と当
接させ、このキャップの上面および磁気コアを外装樹脂
で覆った電流検出装置。1. A circuit board, a magnetic core embedded in the circuit board and having a magnetic gap formed between the two ends on the circuit board, and a current detection coil wound around the center of the magnetic core. And a magnetoelectric conversion element mounted on the circuit board corresponding to the magnetic gap of the magnetic core, a cap covering the magnetoelectric conversion element is provided on the board, and the upper surface of the cap contacts one end of the magnetic core. A current detection device that is in contact with the upper surface of the cap and the magnetic core is covered with an exterior resin. 【請求項２】 キャップは、下面が開口した半球状とし
た請求項１記載の電流検出装置。2. The current detecting device according to claim 1, wherein the cap has a hemispherical shape with an open lower surface. 【請求項３】 キャップを、磁気コアの一端に接着した
請求項１または２記載の電流検出装置。3. The current detecting device according to claim 1, wherein the cap is bonded to one end of the magnetic core.
JP8055719A 1996-03-13 1996-03-13 Current detector Pending JPH09243667A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8055719A JPH09243667A (en) 1996-03-13 1996-03-13 Current detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8055719A JPH09243667A (en) 1996-03-13 1996-03-13 Current detector

Publications (1)

Publication Number Publication Date
JPH09243667A true JPH09243667A (en) 1997-09-19

Family

ID=13006688

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8055719A Pending JPH09243667A (en) 1996-03-13 1996-03-13 Current detector

Country Status (1)

Country Link
JP (1) JPH09243667A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003056347A1 (en) * 2001-12-27 2003-07-10 Matsushita Electric Industrial Co., Ltd. Current sensor

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003056347A1 (en) * 2001-12-27 2003-07-10 Matsushita Electric Industrial Co., Ltd. Current sensor
JPWO2003056347A1 (en) * 2001-12-27 2005-05-12 松下電器産業株式会社 Current detector
JP4507599B2 (en) * 2001-12-27 2010-07-21 パナソニック株式会社 Current detector

Similar Documents

Publication Publication Date Title
US6727683B2 (en) Hall-effect current detector
JP4414545B2 (en) Manufacturing method of current sensor
TW556474B (en) Fluxgate sensor integrated in printed circuit board and method for manufacturing the same
JPH09127159A (en) Current detector
JP4507599B2 (en) Current detector
JP2002243767A (en) Electric current detector
JPH09243667A (en) Current detector
JP2002286822A (en) Magnetic sensor
JPS6180074A (en) Magnetic sensor with terminal for detecting current
JPH08178965A (en) Current detection circuit module
JPH01240867A (en) Current detector
JP2935409B2 (en) Current detector
JPH08248066A (en) Current detector
JP2542216Y2 (en) Detection structure of current sensor
JPH04148869A (en) Current sensor
JP2934255B2 (en) Magnetic sensor
JPH0835993A (en) Current detector
JPH054037U (en) Current detection sensor
JPH06109771A (en) Current sensor
JPS6091209A (en) Magnetic sensor
JP3543309B2 (en) Current detector
JPS6041474B2 (en) signal transmission element
JP2579194Y2 (en) Current detector
JPH0754332B2 (en) Current detection unit
JP2003098195A (en) Current detector