WO2016111278A1 - Capteur de courant - Google Patents

Capteur de courant Download PDF

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Publication number
WO2016111278A1
WO2016111278A1 PCT/JP2016/050089 JP2016050089W WO2016111278A1 WO 2016111278 A1 WO2016111278 A1 WO 2016111278A1 JP 2016050089 W JP2016050089 W JP 2016050089W WO 2016111278 A1 WO2016111278 A1 WO 2016111278A1
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WO
WIPO (PCT)
Prior art keywords
magnetic field
magnetic sensor
value
sensor
midpoint potential
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Application number
PCT/JP2016/050089
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English (en)
Japanese (ja)
Inventor
英楠 張
Original Assignee
株式会社村田製作所
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.)
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Publication date
Application filed by 株式会社村田製作所 filed Critical 株式会社村田製作所
Priority to CN201680004590.2A priority Critical patent/CN107110897A/zh
Publication of WO2016111278A1 publication Critical patent/WO2016111278A1/fr

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    • 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
    • G01R15/205—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 magneto-resistance devices, e.g. field plates
    • 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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R21/00—Arrangements for measuring electric power or power factor
    • G01R21/08—Arrangements for measuring electric power or power factor by using galvanomagnetic-effect devices, e.g. Hall-effect devices
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
    • G01R33/06—Measuring direction or magnitude of magnetic fields or magnetic flux using galvano-magnetic devices
    • G01R33/09—Magnetoresistive devices

Definitions

  • the present invention relates to a current sensor, and more particularly, to a current sensor used for measuring electric energy in an electric meter.
  • Patent Document 1 Japanese Patent Application Laid-Open No. 2014-169952
  • Patent Document 2 Japanese Patent Application Laid-Open No. 62-110165
  • Patent Document 3 Japanese Unexamined Patent Application Publication No. 2014-55791
  • Patent Document 5 Japanese Unexamined Patent Application Publication No. 2013-196861
  • the current sensor described in Patent Document 1 includes an AC power supply that supplies current to a load, a magnetoresistive effect element that changes its resistance value based on a magnetic field that changes with the current flowing through the load, and a current that flows through the magnetoresistive effect element. And a detection output circuit that detects and outputs the maximum and minimum values of the potential difference between both terminals of the magnetoresistive element, and detects the current flowing through the load based on the maximum and minimum values. To do.
  • the wattmeter described in Patent Document 2 has a current sensing device physically attached adjacent to the power supply conductor in a magnetically coupled relationship so as to sense the magnitude of the current through the power supply conductor. .
  • the wattmeter described in Patent Document 3 has a group of magnetoresistive effect elements connected in a bridge, and at least one of the magnetoresistive effect elements in the magnetoresistive effect element group is resisted by a magnetic field generated by the magnetic field generating means. It is arranged so that the value changes.
  • the current sensor described in Patent Document 4 includes a current path having a U-shape and a plurality of magnetoresistive elements that detect a magnetic field.
  • a partition member that is an insulating portion is provided behind a terminal holding portion that holds a pair of input terminals for inputting current through a power cable.
  • a current path for connecting the pair of input terminals and the pair of output terminals is disposed on the upper surface side of the partition member.
  • a magnetic detection element that detects a magnetic field generated from the current path is disposed on the bottom surface side of the partition member.
  • the current sensor as described above is used for inverter control in automobiles and industrial equipment such as hybrid cars or electric cars, overcurrent protection in power generators, and measurement of electric energy in electric meters.
  • the magnetic tampering detection method for a meter described in Patent Document 6 continuously detects the magnetic field strength near the meter using a magnetic field strength sensor.
  • the magnetic field strength sensor generates an analog voltage signal proportional to the detected magnetic field strength.
  • the analog voltage signal of the magnetic field strength sensor is continuously converted into a digital voltage signal.
  • the digital voltage signal is stored in memory in an intermittent manner, and the digital voltage signal is monitored for deviations indicating meter tampering. When tampering is detected, an alarm to indicate tampering is triggered.
  • a plurality of magnetic field detection devices are arranged close to the meter.
  • a magnetic event signal is generated when the detected output voltage of the magnetic field exceeds a predetermined threshold.
  • JP 2014-169952 A Japanese Unexamined Patent Publication No. Sho 62-110165 JP-A 64-74457 JP 2014-55791 A JP 2013-196861 A JP 2012-108128 A US Pat. No. 7,218,223
  • the present invention has been made in view of the above-mentioned problems, and is a current sensor that can reduce the size and cost of an electric meter that can perform both detection of tampering with an external magnetic field and measurement of electric energy.
  • the purpose is to provide.
  • a current sensor includes a primary conductor and at least one magnetoresistive element, a plurality of magnetic sensors for detecting the strength of a magnetic field generated by an alternating current flowing through the primary conductor, and a plurality of magnetic sensors And a control unit electrically connected to each of the above.
  • the control unit determines the presence or absence of an external magnetic field based on the midpoint potential of each of the plurality of magnetic sensors.
  • the control unit includes a storage unit and a determination unit.
  • the storage unit stores the first threshold value and the value of the midpoint potential when there is no external magnetic field.
  • the determination unit determines the difference between the central value of the signal waveform of the midpoint potential of at least one of the plurality of magnetic sensors input to the control unit and the value of the midpoint potential when there is no external magnetic field. If the absolute value is greater than or equal to the first threshold, it is determined that there is an external magnetic field.
  • the storage unit stores the second threshold value.
  • the determination unit determines whether the absolute value of the difference between the central values of the signal waveforms of the midpoint potentials of at least two magnetic sensors of the plurality of magnetic sensors input to the control unit is equal to or greater than the second threshold value. It is judged that there is.
  • the storage unit stores a third threshold value.
  • the determination unit is configured such that at least one of the absolute value of the maximum value and the absolute value of the minimum value of the midpoint potential of at least one of the plurality of magnetic sensors input to the control unit is greater than or equal to the third threshold value. It is determined that there is an external magnetic field in some cases.
  • FIG. 1 is a plan view showing a configuration of a current sensor according to an embodiment of the present invention.
  • FIG. 2 is a block diagram showing the configuration of the magnetic sensor provided in the current sensor according to one embodiment of the present invention.
  • FIG. 3 is a plan view showing the configuration of the magnetic sensor provided in the current sensor according to the embodiment of the present invention.
  • FIG. 4 is a block diagram showing the configuration of the current sensor according to one embodiment of the present invention.
  • a current sensor 100 includes a primary conductor 110 and four magnetoresistive elements R1 to R4, and is generated by an alternating current flowing through the primary conductor 110.
  • the two magnetic sensors are composed of a first magnetic sensor 120a and a second magnetic sensor 120b.
  • the current sensor 100 includes two magnetic sensors.
  • the present invention is not limited to this, and it is only necessary to include at least one magnetic sensor.
  • the primary conductor 110 has a planar shape bent into an L shape. Specifically, the two straight portions are bent so as to intersect at an angle ⁇ in plan view. The angle ⁇ is about 90 °.
  • the primary conductor 110 is made of copper.
  • the material of the primary conductor 110 is not limited to this, and may be a metal such as silver or aluminum or an alloy containing these metals.
  • the primary conductor 110 may be subjected to a surface treatment. For example, at least one plating layer made of a metal such as nickel, tin, silver, copper, or an alloy containing these metals may be provided on the surface of the primary conductor 110.
  • the primary conductor 110 is formed by pressing a thin plate.
  • the method of forming the primary conductor 110 is not limited to this, and the primary conductor 110 may be formed by a method such as cutting, forging, or casting.
  • the cross-sectional shape of the primary conductor 110 is not limited to a rectangle, and may be another shape such as a circle.
  • the directions (magnetic sensitive directions) 120ax and 120bx of the detection axes of the first magnetic sensor 120a and the second magnetic sensor 120b are the width direction of the primary conductor 110. That is, each of the first magnetic sensor 120a and the second magnetic sensor 120b can detect a magnetic field in a direction orthogonal to both the thickness direction of the primary conductor 110 and the direction 110i in which the current flows through the primary conductor 110. Yes.
  • each of the first magnetic sensor 120a and the second magnetic sensor 120b includes a voltage positive output terminal V +, a voltage negative output terminal V-, a power supply positive terminal Vcc, And a ground terminal GND of the power source.
  • Each of the first magnetic sensor 120a and the second magnetic sensor 120b further includes four magnetoresistive elements R1 to R4 constituting the Wheatstone bridge type bridge circuit 1.
  • Each of the four magnetoresistive elements R1 to R4 is composed of a permalloy thin film.
  • each of the four magnetoresistive elements R1 to R4 is an AMR (Anisotropic Magneto Resistance) element, but instead of an AMR element, a GMR (Giant Magneto Resistance) element, a TMR (Tunnel Magneto Resistance) element.
  • a magnetoresistive effect element such as an element, a BMR (Balistic Magneto Resistance) element, or a CMR (Colossal Magneto Resistance) element may be used.
  • each of the first magnetic sensor 120a and the second magnetic sensor 120b may have a half-bridge circuit including two magnetoresistive elements. Further, each of the first magnetic sensor 120a and the second magnetic sensor 120b may have a half-bridge circuit including one magnetoresistive element and one fixed resistor.
  • Each of the first magnetic sensor 120a and the second magnetic sensor 120b further includes two permanent magnets with a pair of different polarities facing each other.
  • the two permanent magnets are composed of a first magnet 2a and a second magnet 2b.
  • Each of the first magnet 2a and the second magnet 2b applies a bias magnetic field to the four magnetoresistive elements R1 to R4.
  • Each of the four magnetoresistive elements R1 to R4, the first magnet 2a and the second magnet 2b is fixed on one substrate.
  • the positive electrode connected to the positive terminal Vcc and the ground electrode connected to the ground terminal GND are aligned along the X-axis direction.
  • the midpoint electrode connected to the positive output terminal V + and the midpoint electrode connected to the negative output terminal V ⁇ are arranged along the Y-axis direction.
  • Each of the four magnetoresistive elements R1 to R4 has a zigzag pattern.
  • the patterns of the magnetoresistive elements R1 and R4 extend along the Y-axis direction
  • the patterns of the magnetoresistive elements R2 and R3 extend along the X-axis direction.
  • the maximum magnetic field detection direction of the magnetoresistive elements R1 and R4 is the X-axis direction
  • the maximum magnetic field detection direction of the magnetoresistive elements R2 and R3 is the Y-axis direction.
  • the bridge circuit 1 is formed by a thin film process. Specifically, a permalloy film serving as a magnetoresistive effect element and a copper film or gold film serving as an electrode are formed by a thin film forming method such as sputtering or vapor deposition. A photomask having a desired shape is formed on each of the formed films by photolithography. Next, a magnetoresistive effect element pattern and an electrode pattern having a desired shape are formed by an etching method such as ion milling.
  • Each of the first magnet 2a and the second magnet 2b is formed by a thin film process as described above or a bulk process in which a magnet material is molded and assembled.
  • a magnet material a ferrite magnet, a Co magnet such as an SmCo magnet, or an Fe magnet such as an NdFeB magnet can be used.
  • Each of the first magnet 2a and the second magnet 2b has a longitudinal direction of each of the first magnet 2a and the second magnet 2b, that is, a direction perpendicular to the direction of the magnetic field lines of each of the first magnet 2a and the second magnet 2b. , Arranged so as to intersect the X-axis direction.
  • the four magnetoresistive elements R1 to R4 are arranged in the X-axis direction and the Y direction.
  • a bias magnetic field is applied in both axial directions.
  • the angle ⁇ formed by the magnetization direction 20a of the first magnet 2a and the second magnet 2b and the direction 110i in which the current flows through the primary conductor 110 is about 30 °. It is.
  • the angle ⁇ formed by the magnetization direction 20b of the first magnet 2a and the second magnet 2b and the direction 110i in which the current flows through the primary conductor 110 is about 30 °.
  • the magnetization direction 20a and the magnetization direction 20b may both be opposite directions.
  • the magnetization directions of the four magnetoresistive elements R1 to R4 can be made to coincide with the Y-axis direction even when there is no external magnetic field to be detected. Therefore, the hysteresis can be reduced by suppressing the discontinuous movement of the domain wall.
  • the control unit 130 electrically connected to each of the first magnetic sensor 120a and the second magnetic sensor 120b having the above configuration includes a storage unit 131 and a determination unit 132.
  • the storage unit 131 stores various information input in advance.
  • the determination unit 132 determines the presence / absence of an external magnetic field and the presence / absence of an abnormality from the signal input to the control unit 130 and the information stored in the storage unit 131.
  • the first magnetic sensor 120 a, the second magnetic sensor 120 b, and the control unit 130 are disposed on the substrate 150.
  • the current sensor 100 further includes a temperature sensor 140 disposed on the substrate 150 and electrically connected to the control unit 130.
  • the temperature sensor 140 measures the environmental temperature. Note that the temperature sensor 140 is not necessarily provided.
  • the substrate 150 is disposed on a main board 160 having a primary conductor 110 formed on the upper surface.
  • the input wiring 10 and the output wiring 11 connected to the drive power supply line of the electric meter are connected to one end side and the other end side of the primary conductor 110, respectively.
  • a metering current that is an alternating current input from the input wiring 10 passes through the primary conductor 110 and exits from the output wiring 11.
  • substrate 150 and the main board 160 may be comprised integrally.
  • the first magnetic sensor 120a detects the strength of the magnetic field 110e1 generated around the primary conductor 110 when an alternating current flows through the primary conductor 110.
  • the second magnetic sensor 120b detects the strength of the magnetic field 110e2 generated around the primary conductor 110 when an alternating current flows through the primary conductor 110.
  • the output voltage of the first magnetic sensor 120a and the output voltage of the second magnetic sensor 120b are substantially the same.
  • the midpoint potential of the first magnetic sensor 120a and the midpoint potential of the second magnetic sensor 120b are substantially the same.
  • the midpoint potential of each of the first magnetic sensor 120a and the second magnetic sensor 120b is a voltage output from the positive output terminal V + or the negative output terminal V ⁇ .
  • the storage unit 131 stores the value of the midpoint potential of each of the first magnetic sensor 120a and the second magnetic sensor 120b.
  • the storage unit 131 stores temperature characteristics of the first magnetic sensor 120a and the second magnetic sensor 120b. Specifically, variation patterns of output voltages of the first magnetic sensor 120a and the second magnetic sensor 120b due to changes in the environmental temperature are stored.
  • the storage unit 131 stores the first threshold value and the virtual signal waveform of the midpoint potential when there is no external magnetic field.
  • the first threshold is appropriately set so that meter tampering with an external magnetic field can be detected.
  • the midpoint potential of each of the first magnetic sensor 120a and the second magnetic sensor 120b is a voltage output from the positive output terminal V + or the negative output terminal V ⁇ .
  • the control unit 130 grasps the midpoint potential of each of the first magnetic sensor 120a and the second magnetic sensor 120b.
  • FIG. 5 shows a virtual signal waveform of the midpoint potential of each of the first magnetic sensor and the second magnetic sensor when there is no external magnetic field, and one of the first magnetic sensor and the second magnetic sensor when there is an external magnetic field. It is a graph which shows the signal waveform of a middle point electric potential.
  • the vertical axis represents the midpoint potential (V) of the magnetic sensor
  • the horizontal axis represents time (t).
  • the virtual signal waveform N of the middle point potential of the magnetic sensor when there is no external magnetic field is a two-dot chain line
  • the center value C 1 of the virtual signal waveform N is a one-dot chain line
  • the magnetic sensor is when there is an external magnetic field.
  • the signal waveform E 1 of the middle point potential is indicated by a solid line
  • the center value C 2 of the signal waveform E 1 is indicated by a one-dot chain line.
  • the external magnetic field is superimposed on the magnetic field generated by the current flowing through the primary conductor 110, and the signal at the midpoint potential of each of the first magnetic sensor 120a and the second magnetic sensor 120b.
  • the waveform deviates from the virtual signal waveform N.
  • the determination unit 132 has a central value C of the signal waveform E 1 of the midpoint potential of at least one of the first magnetic sensor 120a and the second magnetic sensor 120b input to the control unit 130.
  • the absolute value V 1 of the difference between 2 and the center value C 1 of the virtual signal waveform N is equal to or greater than the first threshold value, it is determined that there is an external magnetic field.
  • control unit 130 determines the presence or absence of an external magnetic field based on the midpoint potential of each of the first magnetic sensor 120a and the second magnetic sensor 120b.
  • the storage unit 131 further stores a second threshold value.
  • the second threshold value is appropriately set so that meter tampering with an external magnetic field can be detected.
  • FIG. 6 shows a virtual signal waveform of the midpoint potential of each of the first magnetic sensor and the second magnetic sensor when there is no external magnetic field and a first signal when there is an external magnetic field in the current sensor according to one embodiment of the present invention. It is a graph which shows the signal waveform of the midpoint electric potential of each of 1 magnetic sensor and 2nd magnetic sensor.
  • the vertical axis indicates the midpoint potential (V) of the magnetic sensor
  • the horizontal axis indicates time (t).
  • the virtual signal waveform N of the midpoint potential of the magnetic sensor when there is no external magnetic field is a two-dot chain line
  • the center value C 1 of the virtual signal waveform N is a one-dot chain line
  • the first is when there is an external magnetic field.
  • the signal waveform E 1 of the midpoint potential of the magnetic sensor is a solid line
  • the center value C 2 of the signal waveform E 1 is a dashed line
  • the signal waveform E 2 of the midpoint potential of the second magnetic sensor when there is an external magnetic field is a solid line
  • the center value C 3 of the waveform E 2 is indicated by a one-dot chain line.
  • the external magnetic field is superimposed on the magnetic field generated by the current flowing through the primary conductor 110, and the signal at the midpoint potential of each of the first magnetic sensor 120a and the second magnetic sensor 120b.
  • the waveforms E 1 and E 2 deviate from the virtual signal waveform N. Since the strengths of the external magnetic fields acting on each of the first magnetic sensor 120a and the second magnetic sensor 120b are different from each other, the signal waveforms E 1 and E of the midpoint potential of the first magnetic sensor 120a and the second magnetic sensor 120b are different. The deviation from the two virtual signal waveforms N is different from each other.
  • the determination unit 132 includes the center value C 2 and the center value of the signal waveforms E 1 and E 2 of the midpoint potential of each of the first magnetic sensor 120a and the second magnetic sensor 120b input to the control unit 130. Even when the absolute value V 2 of the difference from C 3 is equal to or greater than the second threshold, it is determined that there is an external magnetic field.
  • control unit 130 determines the presence or absence of an external magnetic field based on the midpoint potential of each of the first magnetic sensor 120a and the second magnetic sensor 120b.
  • the storage unit 131 further stores a third threshold value.
  • the third threshold value is appropriately set so that meter tampering with an external magnetic field can be detected.
  • FIG. 7 is a graph showing the relationship between the strength of the magnetic field detected by the magnetic sensor and the output voltage of the magnetic sensor in the current sensor according to the embodiment of the present invention.
  • the vertical axis indicates the midpoint potential (V) of the magnetic sensor
  • the horizontal axis indicates the strength of the magnetic field.
  • the midpoint potential increases in proportion to the strength of the magnetic field to be detected. If the maximum value of the strength of the magnetic field generated around the primary conductor 110 detected by each of the first magnetic sensor 120a and the second magnetic sensor 120b in the state where there is no external magnetic field is Hmax, ⁇ Hmax, the first magnetic sensor
  • the maximum value of the midpoint potential of each of the sensor 120a and the second magnetic sensor 120b is Vmax, and the minimum value is ⁇ Vmax.
  • a region from the maximum value Vmax to the minimum value ⁇ Vmax of the midpoint potential is defined as a normal region T 1 .
  • the maximum value Vmax of the midpoint potential is set as the third threshold value.
  • At least one of the maximum value Vo and the minimum value Vo of any midpoint potential of the first magnetic sensor 120a and the second magnetic sensor 120b becomes the value of the abnormality in the region T 2.
  • the determination unit 132 has an absolute value and a minimum value of the maximum value of the midpoint potential of at least one of the first magnetic sensor 120a and the second magnetic sensor 120b input to the control unit 130. It is also determined that an external magnetic field is present when at least one of the absolute values of is greater than or equal to the third threshold value Vmax.
  • control unit 130 determines the presence or absence of an external magnetic field based on the midpoint potential of each of the first magnetic sensor 120a and the second magnetic sensor 120b.
  • both the detection of meter tampering by an external magnetic field and the measurement of electric energy can be performed, so that it is not necessary to separately arrange a magnetic sensor for detecting an external magnetic field in an electric meter. Therefore, the electric meter can be reduced in size and cost.
  • the storage unit 131 only needs to store at least one of the first threshold value, the second threshold value, and the third threshold value. Further, the determination unit 132 may determine the presence or absence of an external magnetic field by appropriately selecting or combining any one of the first threshold value, the second threshold value, and the third threshold value.

Abstract

Dans la présente invention, un capteur de courant comprend: un conducteur primaire (110); une pluralité de capteurs magnétiques (120a, 120b) qui comprennent chacun au moins un élément à effet magnétorésistif et qui détectent l'intensité d'un champ magnétique produit par un courant alternatif qui circule à travers le conducteur primaire (110); et une unité de commande (130) qui est électriquement connectée à chacun des capteurs magnétiques de la pluralité de capteurs magnétiques (120a, 120b). L'unité de commande (130) détermine la présence ou l'absence d'un champ magnétique externe sur la base de la tension moyenne de chacun des capteurs magnétiques de la pluralité de capteurs magnétiques (120a, 120b).
PCT/JP2016/050089 2015-01-08 2016-01-05 Capteur de courant WO2016111278A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201680004590.2A CN107110897A (zh) 2015-01-08 2016-01-05 电流传感器

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JP2015-002320 2015-01-08
JP2015002320 2015-01-08

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WO2016111278A1 true WO2016111278A1 (fr) 2016-07-14

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03503930A (ja) * 1988-04-21 1991-08-29 オメガ　エレクトリック　リミテッド 磁界検出方式
JP2012108128A (ja) * 2010-11-18 2012-06-07 General Electric Co <Ge> メータの磁気改ざん検出のための方法、デバイス及びコンピュータプログラム成果物
JP2013156029A (ja) * 2012-01-26 2013-08-15 Toyota Industries Corp 電流センサ

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1274086A (zh) * 1999-12-21 2000-11-22 南京大学 巨磁电阻效应交、直流两用电流检测、控制器件
US8593133B2 (en) * 2010-12-29 2013-11-26 General Electric Company Current measuring systems and methods of assembling the same
JP5586036B2 (ja) * 2011-01-11 2014-09-10 アルプス・グリーンデバイス株式会社 電流センサ
WO2014111976A1 (fr) * 2013-01-18 2014-07-24 株式会社村田製作所 Détecteur magnétique et son procédé de fabrication
WO2014181382A1 (fr) * 2013-05-10 2014-11-13 株式会社村田製作所 Détecteur magnétique de courant et procédé de mesure du courant

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03503930A (ja) * 1988-04-21 1991-08-29 オメガ　エレクトリック　リミテッド 磁界検出方式
JP2012108128A (ja) * 2010-11-18 2012-06-07 General Electric Co <Ge> メータの磁気改ざん検出のための方法、デバイス及びコンピュータプログラム成果物
JP2013156029A (ja) * 2012-01-26 2013-08-15 Toyota Industries Corp 電流センサ

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