WO2003056347A1 - Detecteur de courant - Google Patents

Detecteur de courant Download PDF

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Publication number
WO2003056347A1
WO2003056347A1 PCT/JP2002/013358 JP0213358W WO03056347A1 WO 2003056347 A1 WO2003056347 A1 WO 2003056347A1 JP 0213358 W JP0213358 W JP 0213358W WO 03056347 A1 WO03056347 A1 WO 03056347A1
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WO
WIPO (PCT)
Prior art keywords
core
ring
substrate
hall element
detection device
Prior art date
Application number
PCT/JP2002/013358
Other languages
English (en)
Japanese (ja)
Inventor
Sueo Matsumoto
Akihiko Ura
Junji Oishi
Takashi Hara
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 JP2003556818A priority Critical patent/JP4507599B2/ja
Publication of WO2003056347A1 publication Critical patent/WO2003056347A1/fr

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • 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
    • G01R15/20—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices
    • G01R15/202—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices using Hall-effect devices

Definitions

  • the present invention relates to a current detector for detecting a current flowing in a device such as a motor.
  • a conventional current detector has a configuration as shown in FIGS. 11A and 11B, as disclosed in, for example, Japanese Patent Application Laid-Open No. 08-21105.
  • FIG. 12A is a perspective view showing the configuration of a conventional current detector
  • FIG. 12B is a side view thereof.
  • a Hall element 22 is mounted on the substrate 21, and ring-shaped cores (hereinafter referred to as cores) 23 are formed on the upper and lower sides of the substrate 21 so as to sandwich the Hall element 22.
  • a coil 24 is wound around the core 23 and a part of both ends thereof is fixed by soldering.
  • the electronic circuit 25 comprises chip parts 25 A and I 2 C 5 B for amplifying the output of the Hall element 22, and outputs the current value detected through the terminal 26 as a voltage value. '
  • Such a current detector is manufactured in the following manner. That is, first, on the substrate 21 are mounted the Hall elements 22 and the chip components 25 A, I 2 C 5 B, etc. constituting the electronic circuit 25. Next, the coil 24 prewound from the gap of the core 23 is inserted at a position crossing the magnetic path of the core 23. In this state, the core 23 is fixed so that the Hall element 2 2 is disposed in the gap portion of the core 23. Subsequently, the coil 24 is fixed to the substrate 21.
  • such a current detector operates as follows. That is, the coil 24 is connected in series with a device such as a motor, and the current flowing in the device flows as it is. The current flowing through the coil 24 generates a magnetic flux in the core 23, and the generated magnetic flux changes the output voltage of the Hall element 22. Let The current detector detects the magnitude of the current flowing through the device by amplifying the change in the output of the Hall element 22 with the electronic circuit 25.
  • the coil 24 wound in advance is inserted from the gap of the core 2 3, and in this state, the Hall element 2 2 is fixed so as to be disposed in the gap. For this reason, it is impossible to make the gap of the core 2 3 smaller than the wire diameter (diameter) of the coil 2 4. Therefore, in order to improve the performance as a current detector, it is necessary to increase the number of turns of the coil 24 wound around the core 23. This makes miniaturization difficult. Disclosure of the invention
  • the current detector according to the present invention comprises a ring-shaped core provided so as to sandwich a substrate between its gaps, a Hall element provided on the substrate so as to be disposed between the gaps of the core, and a core It has a U-shaped coil set to traverse the magnetic path, and an electronic circuit section for amplifying the output of the Hall element.
  • FIG. 1A is a perspective view showing a configuration of a current detector in a first embodiment of the present invention.
  • FIG. 1B is a top view showing the configuration of the current detector in the first embodiment of the present invention.
  • FIG. 1C is a side view showing the configuration of the current detector in the first embodiment of the present invention.
  • FIGS. 2A to 2C show the magnetism of the current detector according to the first embodiment of the present invention. It is a perspective view which shows the structure of a pneumatic circuit part.
  • FIG. 3A is a side view showing the configuration of the current detector in the second embodiment of the present invention.
  • FIG. 3B is a top view showing the configuration of the current detector in the second embodiment of the present invention.
  • FIG. 3C is a perspective view showing the configuration of the current detector in the second embodiment of the present invention.
  • FIG. 3D is a perspective view from the back of FIG. 3C.
  • FIG. 3E is a diagram showing a configuration of a current detector in a second embodiment of the present invention.
  • FIG. 4A is a side view showing the configuration of the current detector in the third embodiment of the present invention.
  • FIG. 4B is a top view showing the configuration of the current detector in the third embodiment of the present invention.
  • FIG. 4C is a perspective view showing the configuration of the current detector in the third embodiment of the present invention.
  • FIG. 5A is a side view showing the configuration of the current detector in the fourth embodiment of the present invention.
  • FIG. 5B is a top view showing the configuration of the current detector in the fourth embodiment of the present invention.
  • FIG. 5C is a perspective view showing the configuration of the current detector in the fourth embodiment of the present invention.
  • FIG. 6A is a side view showing the configuration of the current detector in the fifth embodiment of the present invention.
  • FIG. 6B is a top view showing the configuration of the current detector in the fifth embodiment of the present invention.
  • FIG. 7A is a side view showing the configuration of the current detector in the sixth embodiment of the present invention.
  • FIG. 7B is a perspective view showing the configuration of the current detector in the sixth embodiment of the present invention.
  • FIG. 8A is a top view of a ring-shaped core of a current detector in a seventh embodiment of the present invention.
  • FIGS. 8B and 8C are partially enlarged top views of the ring-shaped core for explaining the operation of the current detector in the seventh embodiment of the present invention.
  • FIG. 9 is a top view showing the configuration of the current detector in the eighth embodiment of the present invention.
  • FIG. 10A is a top view showing a configuration of a current detector in a ninth embodiment of the present invention.
  • FIG. 10B is a side view of the ring-shaped core of the current detector in the ninth embodiment of the present invention.
  • FIG. 10C is a view for explaining the force shimming portion of the ring core of the current detector in the ninth embodiment of the present invention.
  • FIG. 10D is a diagram showing the configuration of a ring-shaped core of the current detector in the ninth embodiment of the present invention.
  • FIG. 10E is a side view of another ring-shaped core of the current detector in the ninth embodiment of the present invention.
  • Fig. 10 F is another side view of the ring core of Fig. 10 E.
  • FIG. 11A is a perspective view showing the configuration of a conventional current detector.
  • FIG. 11B is a top view showing the configuration of a conventional current detector. BEST MODE FOR CARRYING OUT THE INVENTION
  • FIG. 1A is a perspective view showing a schematic configuration of a current detector in Embodiment 1
  • FIG. 1B is a top view thereof
  • FIG. 1C is a side view thereof.
  • a detection unit 6 integrated with resin is positioned and fixed on a substrate 1 by a soldering electrode unit 7.
  • Detector 6 A ring-shaped core (hereinafter referred to as core) 3 having a gap, a Hall element 2 provided between the gaps, and a U-shaped coil 4 provided across the magnetic path of the core 3 are made of resin. It is integrated and configured.
  • an electronic circuit 5 composed of a chip component 5 A, an IC 5 B or the like for amplifying the output of the Hall element 2 in the detection unit 6 and detecting the current value.
  • the electronic circuit 5 amplifies the output of the Hall element 2 to a desired voltage value and outputs it via the terminal 8.
  • Such a current detector operates as follows. That is, the coil 4 is connected in series with a device such as a motor, and the current flowing in the device flows as it is. The current flowing through the coil 4 generates a magnetic flux in the core 3, and the generated magnetic flux changes the output voltage of the Hall element 2. By amplifying this change with the electronic circuit 5, the magnitude of the current flowing through the device is detected.
  • the wire diameter (diameter) of the U-shaped coil 4 is larger than the gap of the core 3 and smaller than the ring hole of the core 3.
  • the gap of the core 3 is provided with a gap just so that the Hall element 2 can be disposed.
  • the U-shaped coil 4 is disposed so as to cross the magnetic path of the core 3 through one of the ring holes of the core 3 without inserting the gap from the gap as in the prior art.
  • the gap between the core 3 and the Hall element 2 can be narrowed as narrowly as possible, so the amount of magnetic flux of the core 3 is increased. Therefore, as the number of turns of the coil wound around the core 3 is changed to the U-shaped coil 4, the reduced amount of magnetic flux is also covered.
  • the output from Hall element 2 increases as a whole, and the performance as a current detector improves. In addition, since the coil 4 can be mounted very easily and efficiently, productivity is improved.
  • the core 3, the Hall element 2, and the coil 4 are disposed in the predetermined positional relationship as described above, and are integrally molded of resin to form the detection portion 6.
  • the detection unit 6 is a chip component that constitutes the electronic circuit 5. 5A, IC 5B, etc. Mount at the same position.
  • the detection unit 6 is integrally formed of a resin, it can be mounted by an automatic mounting machine similarly to the chip parts 5A, IC 5B, etc. constituting the electronic circuit 5, and the productivity is greatly improved. improves.
  • FIG. 1 is a perspective view showing the configuration of the detection unit 6.
  • the detection unit 6 has a soldering electrode 7 and is positioned and fixed using this. Thereby, the detection unit 6 is easily positioned and fixed to the substrate in the same manner as the parts on the other substrates.
  • the positioning projection 9 is provided on the bottom surface of the detection unit 6, and an engagement portion (not shown) to be engaged with the positioning projection 9 is provided on the substrate 1. Then, the detection portion 6 is easily positioned and fixed to the substrate 1 by engaging the positioning projection 9 with the engaging portion.
  • the top surface of the detection unit 6 can be mounted by suction using an automatic mounting machine even when it is flat.
  • FIG. 2C when the protrusion 10 for automatic mounting is provided on the upper surface of the detection unit 6, mounting with an automatic mounting machine becomes easier.
  • FIG. 3A is a side view showing a schematic configuration of the current detector in Embodiment 2
  • FIG. 3B is a top view
  • FIG. 3C is a perspective view
  • FIG. 3D is a perspective view from the back
  • a Hall element 2 is disposed on the substrate 1 at a position straddling a notch 12 provided in the substrate 1. Further, the core 3 and the U-shaped coil (hereinafter, coil) 4 are disposed such that the hole element 2 is positioned in the gap portion of the ring-shaped core (hereinafter, core) 3. Further, the core 3 is configured to have a projecting portion 16 projecting toward the inside of the substrate notch portion 12 from the one end located on the side opposite to the substrate surface on which the hall element 2 is provided. The notch width of the substrate notch 12 is smaller than the width of the core of the portion where the core 3 faces the Hall element 2. This is easy The Hall element 2 can be attached so as to straddle the notch 12. The Povin 1 1 fixes a part of the coil 4.
  • the electronic circuit 5 has the same configuration as that of the first embodiment, and outputs the detected current value to the external circuit through the terminal 8 as a voltage.
  • the width of the projecting portion 16 is smaller than the width of the portion where the core 3 faces the Hall element 2. As a result, even if the gap of core 3 is narrowed, the protruding portion 16 of core 3 is easily inserted into substrate 1 and Hall element 2 is attached to substrate 1, so that core 3 is positioned between the gaps of core 3. It can be installed as In addition, since the width of the portion close to the Hall element of the core 3 is reduced, the magnetic flux density in the portion where the width of the core 3 is small becomes high, and a high magnetic flux density can be applied to the Hall element.
  • the povin 11 is preferably made of an insulating resin. This ensures insulation withstanding voltage between the coil and the other parts of the current detector. Further, the coil 4 is easily positioned and fixed to the substrate 1 and the core 3 by positioning and fixing the povin 11 on the substrate 1. In addition, it is preferable to apply insulating resin to the surface of the coil 4 and fix it on the substrate. As a result, the withstand voltage of the coil 4 and the other part than the coil of the current detector can be secured with a simple configuration.
  • the surface of the povin 11 is covered with a conductive material (not shown), and the conductive material portion is connected to the ground of the electronic circuit 5 for amplifying the output of the Hall element 2.
  • the conductive material covering the surface of Povin 11 becomes a shield.
  • Method of covering with the above conductive material examples include plating and a method of applying a conductive resin.
  • a laminated core in which a layer made of a solderable material is laminated as the outermost layer may be used as the core 3 and connected to the ground of the substrate 1. This produces the same effect as described above.
  • the povin 1 1 holding the coil 4 has a first flange 13, a second flange 14 and a holding part 15.
  • the substrate 1 and the core 3 and the coil 4 are fixed by the first flange 13, the second flange 14 and the sandwiching part 15.
  • the length of the terminal 8 connected to the external circuit is longer than the lead terminal 4 A of the coil 4.
  • the manufacturing process of the current detector with the above configuration will be briefly described.
  • the Hall element 2 and the components that make up the electronic circuit 5 are mounted on the substrate 1.
  • the coil 4 to which the povin 1 1 is attached in advance to the core 3 is inserted from the side of the core 3 and combined.
  • the core 3 and the coil 4 can be easily assembled to the substrate 1 by being slid from the notched portion 12 of the substrate.
  • the coil 4 can be easily assembled to the core 3, these can be mounted very easily and efficiently, and the productivity is improved.
  • FIG. 4A is a side view showing a schematic configuration of the current detector in Embodiment 3
  • FIG. 4B is a top view thereof
  • FIG. 4C is a perspective view thereof.
  • the basic configuration of the third embodiment is the same as that of the second embodiment.
  • the difference from the second embodiment is that a protective resin 17 is provided so as to cover the Hall element 2, the gap of the core 3, and the substrate notch 12. This further improves the reliability, particularly the moisture resistance.
  • the protective resin 12 is preferably made of a soft elastic resin. Thereby, the stress on the Hall element 2 in the use environment is relaxed, and the fluctuation of the output voltage value of the current detector generated by the stress on the Hall element 2 is reduced. (Embodiment 4)
  • FIG. 5A is a side view showing a schematic configuration of the current detector in Embodiment 4, FIG. 5B is a top view thereof, and FIG. 5C is a perspective view thereof.
  • the basic configuration of the fourth embodiment is the same as that of the second embodiment.
  • a difference from the second embodiment is that a wall 18 is provided to cover the Hall element 2, the gap of the core 3, and the substrate notch 12. This configuration protects the internal configuration against the environment of use.
  • a hollow cap may be provided instead of the wall 18.
  • FIG. 6A is a side view showing a schematic configuration of the current detector in the sixth embodiment, and FIG. 6B is a top view thereof.
  • the Hall element 2 is disposed in the notch 12 provided in the substrate 1. Further, the core 3 and the U-shaped coil (hereinafter, coil) 4 are disposed such that the Hall element 2 is positioned in the gap portion of the ring-shaped core (hereinafter, core) 3.
  • the length of the gap between the core 3 which has conventionally been restricted by the thicknesses of the substrate 1 and the Hall element 2 is limited only by the thickness of the substrate 1, and the gap length of the core 3 can be narrowed.
  • the current flowing through the coil 4 makes it possible to increase the magnetic flux generated in the core 3 and its gap, and the performance as a current detector is improved.
  • the protective resin can be easily applied from the upper surface of the notch portion 12 of the substrate, and the productivity is improved.
  • FIG. 7A is a side view showing a schematic configuration of the current detector in the sixth embodiment
  • FIG. 7B is a perspective view of the same.
  • the basic configuration of the sixth embodiment is the same as that of the second embodiment. A difference from the second embodiment is that a ground pattern 20 is formed on the surface of the substrate 1.
  • the ground pattern 20 provided on the surface of the substrate between the U-shaped coil 4 and the electronic circuit 5 serves as a shield.
  • noise generated in the electronic circuit 5 when the potential of the U-shaped coil 4 rapidly changes due to switching or the like in an apparatus using a current detector can be reduced.
  • the configuration of the ground pattern 20 is, for example, composed of a whole surface or a grid pattern.
  • FIG. 8A is a side view of a ring core in a seventh embodiment
  • FIG. 8B is a view for explaining the state of magnetic flux in the vicinity of the ring core in the seventh embodiment.
  • one end of the ring core 3 on the side facing the Hall element 2 is arched in a direction away from the Hall element 2 to form a recess 3A.
  • the position of the Hall element 2 is shifted with respect to the one end of the ring core 3 facing the Hall element 2 compared to the case where both ends of the ring core 3 are flat as shown in FIG. 8C.
  • FIG. 9 is a top view of the current detector in the eighth embodiment.
  • the basic configuration of the eighth embodiment is the same as that of the second embodiment.
  • the inner peripheral surface 3 B and the outer peripheral surface 3 C of the corner portion of the ring-shaped core 3 are formed by curved surfaces.
  • both the inner circumferential side 3 B and the outer circumferential side 3 C of the corner portion of the ring-shaped core 3 are formed as curved surfaces, but it is also effective to form either one as a curved surface.
  • FIG. 10A is a top view of the current detector in the ninth embodiment.
  • the basic configuration of the ninth embodiment is the same as that of the second embodiment.
  • the ring-shaped core 3 is formed of the laminated core, and as shown in FIG. 1OA, the force shimming portion 3D is provided at the corner of each layer.
  • the ring-shaped core 3 can be made of inexpensive silicon steel plate having high permeability.
  • the core material to be laminated may be other materials such as permalloy (nickel and iron alloy).
  • each layer of the laminated core may be constituted by one magnetic plate.
  • the ring-shaped core 3 may be composed of two laminated cores.
  • the gap of the ring core 3 is expanded and a coil (not shown) which is not affected by the wire diameter of the winding lead is inserted at a position crossing the magnetic path of the ring core 3 from the gap. Na becomes possible.
  • a coil not shown
  • the coil 4 wound in advance and narrowing the length of the gap, it is possible to increase the magnetic flux generated in the core 3 and its gap by the current flowing through the coil 4, and Performance is improved.
  • the current flowing through the coil 4 adjusts the magnetic flux generated in the core 3 and its gap. As a result, it becomes possible to substitute the adjustment of the output voltage which has been performed in the amplification of the electronic circuit 5.
  • one of the layers may be formed of a substantially L-shaped magnetic plate 3E, and each of the other layers may be formed of a substantially I-shaped magnetic plate 3F, which may be alternately stacked.
  • the ring-shaped core can be easily formed by lamination.
  • a joint 3D which is a pivot point of the two stacked bodies, by a V notch as shown in FIG. 10C. This makes it possible to easily form the joint, which is the pivot point of the two laminates, by punching the die.
  • the gap of the ring-shaped core 3 is made smaller than the wire diameter of the U-shaped coil 4, it is possible to easily pass the coil 4 through the ring hole of the core 3 to cross the magnetic path of the core 3 Can. And by narrowing the gap between the core 3 and the Hall element 2, the performance of current detection is improved, and miniaturization is also difficult.
  • the moisture resistance of the device can be further improved.
  • a substrate notch 12 is provided at a position corresponding to the position and at a position corresponding to the gap between the cores 3. Then, the Hall element 2 is disposed so as to straddle the substrate notch 12. With such a configuration, the core 3 and the coil 4 can be easily assembled to the substrate 1 by being slid from the notched portion 12 of the substrate 1.

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  • General Physics & Mathematics (AREA)
  • Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)

Abstract

Cette invention concerne un détecteur de courant comprenant un noyau de forme annulaire disposé de manière à enserrer une plaquette dans son entrefer, un dispositif à effet Hall monté sur la plaquette entre les entrefers du noyau, un bobinage en forme de U disposé de manière à couper un chemin magnétique du noyau et une partie circuit électronique destinée à amplifier la sortie du dispositif à effet Hall. Cet agencement permet au bobinage de traverser le chemin magnétique du noyau et de passer facilement à travers les trous de la bobine, même si l'entrefer du noyau est plus étroit que le diamètre linéaire du bobinage. Le fait de réduire l'entrefer entre le noyau et le dispositif à effet Hall facilite la miniaturisation du détecteur de courant grâce à une amélioration des caractéristiques de détection.
PCT/JP2002/013358 2001-12-27 2002-12-20 Detecteur de courant WO2003056347A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2003556818A JP4507599B2 (ja) 2001-12-27 2002-12-20 電流検出器

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2001-396391 2001-12-27
JP2001396391 2001-12-27

Publications (1)

Publication Number Publication Date
WO2003056347A1 true WO2003056347A1 (fr) 2003-07-10

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PCT/JP2002/013358 WO2003056347A1 (fr) 2001-12-27 2002-12-20 Detecteur de courant

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WO (1) WO2003056347A1 (fr)

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EP1491902A1 (fr) * 2003-06-24 2004-12-29 Robert Bosch Gmbh Capteur de courant pour un appareil de contrôle
JP2005308662A (ja) * 2004-04-23 2005-11-04 Tani Electronics Corp 過電流警報装置
JP2006519375A (ja) * 2003-02-27 2006-08-24 リエゾン、エレクトロニク−メカニク、エルウエム、ソシエテ、アノニム 電流センサー
JP2008020403A (ja) * 2006-07-14 2008-01-31 Asahi Kasei Electronics Co Ltd 電流センサの電流検出機構
JP2010223929A (ja) * 2009-03-19 2010-10-07 Kohshin Electric Corp 磁気コア及びこれを用いた電流センサ
US20130187633A1 (en) * 2012-01-20 2013-07-25 Aisin Seiki Kabushiki Kaisha Current sensor
US20140084914A1 (en) * 2011-06-15 2014-03-27 Autonetworks Technologies, Ltd. Current detection device
JP2015141196A (ja) * 2014-01-27 2015-08-03 甲神電機株式会社 磁気コア及びこれを用いた電流センサ
JP2017032475A (ja) * 2015-08-05 2017-02-09 大崎電気工業株式会社 電流センサユニット
EP2743662B1 (fr) 2012-12-13 2017-05-17 Valeo Schalter und Sensoren GmbH Dispositif comprenant une installation de capteurs de couple et en option une installation de capteurs d'angle de direction pour un véhicule automobile
JP2019534465A (ja) * 2016-10-11 2019-11-28 レム・インテレクチュアル・プロパティ・エスエイＬｅｍ Ｉｎｔｅｌｌｅｃｔｕａｌ Ｐｒｏｐｅｒｔｙ Ｓａ 電流変換器

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JPH11258275A (ja) * 1997-11-29 1999-09-24 Hioki Ee Corp 電流センサ
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JPS599565A (ja) * 1982-07-07 1984-01-18 Nippon Radiator Co Ltd 電流センサ
JPS59107270A (ja) * 1982-12-10 1984-06-21 Alps Electric Co Ltd 直流電流測定センサ
JPH0613496Y2 (ja) * 1987-03-13 1994-04-06 日置電機株式会社 クランプセンサ
JPS63150379U (fr) * 1987-03-23 1988-10-04
JPH02307068A (ja) * 1989-05-22 1990-12-20 Asahi Kasei Denshi Kk 磁気センサ
JPH05333058A (ja) * 1992-05-29 1993-12-17 Mitsubishi Electric Corp 電流検出装置
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