WO2016035606A1 - Capteur de courant - Google Patents

Capteur de courant Download PDF

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Publication number
WO2016035606A1
WO2016035606A1 PCT/JP2015/073807 JP2015073807W WO2016035606A1 WO 2016035606 A1 WO2016035606 A1 WO 2016035606A1 JP 2015073807 W JP2015073807 W JP 2015073807W WO 2016035606 A1 WO2016035606 A1 WO 2016035606A1
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WIPO (PCT)
Prior art keywords
magnetic
sensor
primary conductor
current
magnetic sensor
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PCT/JP2015/073807
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English (en)
Japanese (ja)
Inventor
清水　康弘
仁志 坂口
川浪　崇
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株式会社村田製作所
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Publication of WO2016035606A1 publication Critical patent/WO2016035606A1/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

Definitions

  • the present invention relates to a current sensor, and more particularly to a current sensor that measures the value of a current to be measured by detecting a magnetic field generated according to the current to be measured.
  • JP 2010-2277 A Patent Document 1
  • JP 2010-8050 A Patent Document 2
  • JP 2013-11469 A Patent Document 3
  • JP 2013-238580 A Patent Document 4
  • JP 2013-228315 A Patent Document 5
  • JP 2001-281270 A Patent Document 6
  • the current sensor described in Patent Document 1 includes a bus bar, an insulating substrate, a Hall IC as a magnetic detection element, and a magnetic shield for each of the U phase, the V phase, and the W phase.
  • the upper magnetic shield member and the lower magnetic shield member form an annular enclosure that annularly surrounds the bus bar, the insulating substrate, and the Hall IC, thereby magnetically shielding the external magnetic field.
  • a gap is formed between the upper magnetic shield member and the lower magnetic shield member. The position in the height direction of the gap is the same as or near the position in the height direction of the bus bar, and the gap is located at a portion facing the side surface of the bus bar.
  • the Hall IC is arranged above the central portion of the bus bar.
  • the current sensor described in Patent Document 2 includes a nonmagnetic spacer in addition to the configuration of the current sensor described in Patent Document 1.
  • the protrusions of the nonmagnetic spacer are engaged with the gaps of the magnetic shield body. Thereby, the space
  • the current sensor described in Patent Document 3 includes a sensor substrate on which a magnetoresistive effect element is formed, a measured conductor through which a measured current flows, and a magnetic shield portion that surrounds the sensor substrate and the measured conductor. And have. Two gaps for suppressing magnetic saturation in the magnetic shield part are formed in the magnetic shield part, and the magnetic flux flowing in the magnetic shield part is released in the gap. An air gap is formed at a portion of the magnetic shield portion having a symmetrical structure. The height position of the air gap and the height position of the sensor substrate in the z direction are the same.
  • the current sensor described in Patent Document 4 includes a bus bar that is a conductor through which a current to be measured flows, a Hall IC as a magnetosensitive element, and first and second magnets that form a pair that magnetically shields the Hall IC from an external magnetic field. Have a body. Both ends of the first and second magnetic bodies forming a pair are opposed to each other with a gap.
  • the current sensor described in Patent Document 5 includes a bus bar, a main core, a sub core, and a magnetosensitive element.
  • the main core has an annular shape (C-type) with a gap, and the bus bar passes therethrough.
  • the sub-core is U-shaped (semi-annular) and its end face is located in the vicinity of the gap of the main core, is in non-contact with the main core and is in the same plane as the main core, and a part of the leakage flux of the main core flows.
  • the magnetosensitive element is a Hall element, and exists in a position where the magnetic field generated by the residual magnetization of the main core and the magnetic field generated by the residual magnetization of the sub core are weakened in the gap of the main core.
  • the current sensor described in Patent Document 6 includes a current sensor body, an inner magnetic shield case, and an outer magnetic shield case.
  • the dividing direction of the inner magnetic shield case and the dividing direction of the outer magnetic shield case intersect each other.
  • the inner magnetic shield case surrounds the current sensor body, and the outer magnetic shield case surrounds the inner magnetic shield case.
  • the influence of the magnetic field generated by the residual magnetization of the magnetic shield body is smaller than that of the current sensors described in Patent Documents 1 and 2, but the main core, the sub-core, and the magnetosensitive element. Are required to be arranged at appropriate positions, high assembly accuracy is required, and the manufacture of the current sensor is difficult.
  • the present invention has been made in view of the above problems, and an object of the present invention is to provide a current sensor that can be easily manufactured while reducing a measurement error due to a magnetic field generated by residual magnetization.
  • a current sensor includes a primary conductor through which a current to be measured flows, at least one magnetic sensor for detecting the strength of a magnetic field generated by the current flowing through the primary conductor, and a direction in which the current flows. And a pair of magnetic members each having an L shape.
  • the pair of magnetic members has a rectangular shape in which a gap is provided between the ends when viewed from the direction in which the current flows, and surrounds the primary conductor and the magnetic sensor.
  • the primary conductor has a flat plate shape.
  • the magnetic sensor can detect a magnetic field in a direction orthogonal to both the thickness direction of the primary conductor and the direction in which the current flows.
  • the magnetic sensor is disposed at least one of the one side and the other side in the thickness direction of the primary conductor in the central portion in the width direction of the primary conductor.
  • the current sensor includes a first magnetic sensor and a second magnetic sensor as magnetic sensors.
  • the first magnetic sensor and the second magnetic sensor are positioned to face each other with the primary conductor interposed therebetween.
  • the current sensor further includes a calculation unit that calculates the value of the current by calculating the detection value of the first magnetic sensor and the detection value of the second magnetic sensor. Regarding the strength of the magnetic field generated by the current flowing through the primary conductor, the phase of the detection value of the first magnetic sensor and the phase of the detection value of the second magnetic sensor are opposite in phase.
  • the calculation unit is a subtractor or a differential amplifier.
  • the current sensor further includes a calculation unit that calculates the value of the current by calculating the detection value of the first magnetic sensor and the detection value of the second magnetic sensor. Regarding the strength of the magnetic field generated by the current flowing through the primary conductor, the phase of the detection value of the first magnetic sensor and the phase of the detection value of the second magnetic sensor are in phase.
  • the calculation unit is an adder or a summing amplifier.
  • the current sensor further includes another pair of magnetic members each having an L shape when viewed from the direction in which the current flows.
  • the other pair of magnetic members has a rectangular shape with a gap provided between the ends when viewed from the direction in which the current flows, and is spaced from the pair of magnetic members. Surrounding a pair of magnetic members. The gaps of the other pair of magnetic members are located outside the corners of each pair of magnetic members.
  • FIG. 3 is a cross-sectional view of the current sensor of FIG. 2 as viewed from the direction of arrows III-III. It is a disassembled perspective view which shows the structure of the current sensor which concerns on Embodiment 1 of this invention. It is a perspective view which shows the external appearance of the circuit board of the current sensor which concerns on Embodiment 1 of this invention. It is a circuit diagram which shows the circuit structure of the current sensor which concerns on Embodiment 1 of this invention.
  • FIG. 6 is a cross-sectional view showing a cross-sectional shape of a primary conductor according to Comparative Example 1.
  • FIG. 3 is a cross-sectional view showing a cross-sectional shape of a primary conductor according to Example 1.
  • FIG. 3 is a cross-sectional view schematically showing a magnetic field generated around a primary conductor according to Example 1.
  • FIG. The distance from the front surface or the back surface of the primary conductor and the width direction of the primary conductor (X-axis direction) on the reference line located immediately above or directly below the central portion in the width direction of the primary conductor according to Comparative Example 1 and Example 1 ) Is a graph showing the relationship with the magnetic flux density.
  • FIG. 17 is a cross-sectional view of the current sensor of FIG.
  • the distance from the center position in the thickness direction of the primary conductor on the reference line located immediately above or directly below the center portion in the width direction of the primary conductor 5 is a graph showing the relationship between the magnetic flux density in the length direction (Y-axis direction) of the primary conductor.
  • the distance from the center position in the thickness direction of the primary conductor on the reference line located immediately above or directly below the center portion in the width direction of the primary conductor 5 is a graph showing the relationship between the magnetic flux density in the thickness direction (Z-axis direction) of the primary conductor.
  • FIG. 10 is a graph showing hysteresis rates of a current sensor 100 according to Example 2, a current sensor 200 according to Comparative Example 2, a current sensor 300 according to Comparative Example 3, and a current sensor according to Comparative Example 4. It is sectional drawing which shows the structure of the current sensor which concerns on Embodiment 2 of this invention. It is sectional drawing which shows the structure of the current sensor which concerns on Embodiment 3 of this invention.
  • the current sensor according to Embodiment 4 of the present invention it is a cross-sectional view showing a state where a printed board and a magnetic member are attached to a primary conductor.
  • the current sensor according to Embodiment 4 of the present invention it is a cross-sectional view showing a state before the printed board and the magnetic member are attached to the primary conductor.
  • FIG. 1 is a perspective view showing an appearance of a current sensor according to Embodiment 1 of the present invention.
  • FIG. 2 is a side view of the current sensor of FIG. 1 viewed from the direction of arrow II.
  • FIG. 3 is a cross-sectional view of the current sensor of FIG. 2 as viewed from the direction of arrows III-III.
  • FIG. 4 is an exploded perspective view showing the configuration of the current sensor according to Embodiment 1 of the present invention.
  • FIG. 5 is a perspective view showing an appearance of a circuit board of the current sensor according to the first embodiment of the present invention.
  • FIG. 6 is a circuit diagram showing a circuit configuration of the current sensor according to Embodiment 1 of the present invention.
  • the width direction of a primary conductor 110 which will be described later, is illustrated as an X-axis direction
  • the length direction of the primary conductor 110 is defined as a Y-axis direction
  • the thickness direction of the primary conductor 110 is illustrated as a Z-axis direction.
  • the current sensor 100 detects the primary conductor 110 through which the current to be measured flows and the strength of the magnetic field generated by the current through the primary conductor 110.
  • 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 current sensor 100 includes a pair of magnetic members 170 each having an L shape when the primary conductor 110 is viewed from the direction in which current flows (Y-axis direction).
  • the pair of magnetic members 170 includes a first magnetic member 171 and a second magnetic member 172.
  • the pair of magnetic members 170 has a rectangular shape in which a gap 173 is provided between ends of each other when viewed from the direction in which the current flowing through the primary conductor 110 flows (Y-axis direction).
  • the pair of magnetic members 170 includes a first circuit board 160a, a second circuit board 160b, and a portion sandwiched between the first circuit board 160a and the second circuit board 160b, which will be described later. It surrounds the second conductor 110 with a space.
  • the relative positions of the primary conductor 110, the first circuit board 160a, the second circuit board 160b, and the pair of magnetic members 170 are maintained by a case (not shown).
  • the case is preferably formed of an engineering plastic having high temperature resistance such as polyphenylene sulfide.
  • each of the first circuit board 160a and the second circuit board 160b and the case are fastened with screws, it is preferably fastened with screws made of a non-magnetic material so as not to disturb the magnetic field.
  • the primary conductor 110 has a flat plate shape.
  • the primary conductor 110 has one penetrating portion that penetrates from the front surface to the back surface of the primary conductor 110.
  • a circular through hole 110h is provided in a central portion in the width direction of the primary conductor 110 in a plan view. The current flows through the primary conductor 110 in the Y-axis direction.
  • 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.
  • 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 or casting.
  • the first magnetic sensor 120a is mounted on the first printed circuit board 130a together with the first operational amplifier 140a and the first passive element 150a.
  • the first magnetic sensor 120a is disposed at the center of the first printed circuit board 130a.
  • the first magnetic sensor 120a, the first printed board 130a, the first operational amplifier 140a, and the first passive element 150a constitute a first circuit board 160a.
  • the first printed circuit board 130a includes a substrate made of glass epoxy or alumina, and wiring formed by patterning a metal foil such as a copper foil on the substrate.
  • the first circuit board 160a is configured with an arithmetic circuit that calculates a signal from the first magnetic sensor 120a.
  • the second magnetic sensor 120b is mounted on the second printed circuit board 130b together with the second operational amplifier 140b and the second passive element 150b.
  • the second magnetic sensor 120b is disposed at the center of the second printed circuit board 130b.
  • the second magnetic sensor 120b, the second printed board 130b, the second operational amplifier 140b, and the second passive element 150b constitute a second circuit board 160b.
  • Second printed circuit board 130b includes a substrate made of glass epoxy or alumina, and a wiring formed by patterning a metal foil such as a copper foil on the substrate.
  • the second circuit board 160b is configured with an arithmetic circuit that calculates a signal from the second magnetic sensor 120b.
  • the first circuit board 160a is placed on the surface of the primary conductor 110.
  • the first magnetic sensor 120a is located immediately above the through hole 110h with the first printed board 130a sandwiched between the primary conductor 110.
  • the second circuit board 160 b is disposed on the back surface of the primary conductor 110.
  • the second magnetic sensor 120b is located directly below the through hole 110h with the second printed board 130b sandwiched between the primary conductor 110.
  • first magnetic sensor 120a and the second magnetic sensor 120b are located on opposite sides of the primary conductor 110.
  • the first magnetic sensor 120 a is disposed on one side (upper side) in the thickness direction (Z-axis direction) of the primary conductor 110 in the central portion in the width direction (X-axis direction) of the primary conductor 110.
  • the second magnetic sensor 120b is disposed on the other side (lower side) in the thickness direction (Z-axis direction) of the primary conductor 110 at the center in the width direction (X-axis direction) of the primary conductor 110.
  • the direction (magnetic direction) of the detection axis of each of the first magnetic sensor 120a and the second magnetic sensor 120b is the width direction (X-axis direction) of the primary conductor 110. That is, each of the first magnetic sensor 120a and the second magnetic sensor 120b is orthogonal to both the thickness direction (Z-axis direction) of the primary conductor 110 and the direction in which the current flows through the primary conductor 110 (Y-axis direction).
  • the magnetic field in the direction (X-axis direction) can be detected.
  • Each of the first magnetic sensor 120a and the second magnetic sensor 120b outputs a positive value when a magnetic field directed in one direction of the detection axis is detected, and is directed in a direction opposite to the one direction of the detection axis. It has an input / output characteristic that outputs a negative value when a magnetic field is detected.
  • Each of the first magnetic sensor 120a and the second magnetic sensor 120b has a Wheatstone bridge type bridge circuit including four AMR (Anisotropic Magneto Resistance) elements.
  • Each of the first magnetic sensor 120a and the second magnetic sensor 120b is replaced with an AMR element, and GMR (Giant Magneto Resistance), TMR (Tunnel Magneto Resistance), BMR (Balistic Magneto Resistance), CMR (Colossal Magneto Resistance). It may have a magnetoresistive element.
  • each of the first magnetic sensor 120a and the second magnetic sensor 120b may have a half bridge circuit including two magnetoresistive elements.
  • a magnetic sensor having a Hall element a magnetic sensor having an MI (Magneto Impedance) element using a magnetic impedance effect, a fluxgate type magnetic sensor, or the like is used.
  • Magnetic elements such as a magnetoresistive element and a Hall element may be packaged with a resin, or may be potted with a silicone resin or an epoxy resin.
  • Each AMR element of the first magnetic sensor 120a and the second magnetic sensor 120b has an odd function input / output characteristic by including a barber pole type electrode.
  • each AMR element of the first magnetic sensor 120a and the second magnetic sensor 120b includes a barber pole type electrode, and is biased so that a current flows at a predetermined angle.
  • the magnetization direction of the magnetoresistive film in the AMR element of the first magnetic sensor 120a and the magnetization direction of the magnetoresistive film in the AMR element of the second magnetic sensor 120b are the same direction. Thereby, the fall of the output accuracy by the influence of an external magnetic field can be made small.
  • the current sensor 100 calculates the value of the current flowing through the primary conductor 110 by calculating the detection value of the first magnetic sensor 120a and the detection value of the second magnetic sensor 120b. Is provided.
  • the calculation unit 190 is a differential amplifier. However, the calculation unit 190 may be a subtracter.
  • each of the first magnetic member 171 and the second magnetic member 172 includes a first plate-like portion and a second plate-like portion orthogonal to the first plate-like portion. Have. The first plate-like portions of the first magnetic member 171 and the second magnetic member 172 and the primary conductor 110 are positioned in parallel to each other.
  • Each of the two gaps 173 extends from one end of the pair of magnetic members 170 to the other end in the direction in which the current flows through the primary conductor 110 (Y-axis direction).
  • Each of the two gaps 173 is located at a diagonal of a rectangular shape formed by the pair of magnetic members 170 when viewed from the direction in which the current flowing through the primary conductor 110 flows (Y-axis direction).
  • the center position of the rectangular shape formed by the pair of magnetic members 170 and the position of the through hole 110h of the primary conductor 110 overlap. .
  • Each of the first magnetic member 171 and the second magnetic member 172 is made of permalloy, but the material of each of the first magnetic member 171 and the second magnetic member 172 is not limited to permalloy, and is soft. Any magnetic material having high magnetic permeability and saturation magnetic flux density, such as iron steel, silicon steel, electromagnetic steel, nickel alloy, iron alloy, or ferrite, may be used.
  • each of the first magnetic member 171 and the second magnetic member 172 is formed by pressing a thin plate.
  • the formation method of each of the first magnetic member 171 and the second magnetic member 172 is not limited to this, and each of the first magnetic member 171 and the second magnetic member 172 is formed by a method such as cutting or casting. May be.
  • FIG. 7 is a cross-sectional view showing the cross-sectional shape of the primary conductor according to Comparative Example 1.
  • FIG. 8 is a cross-sectional view illustrating the cross-sectional shape of the primary conductor according to the first embodiment.
  • the outer shape of the cross section of the primary conductor 110 was 30 mm wide and 2.5 mm thick.
  • a through hole 110h having a diameter of 2 mm was provided at the center in the width direction of the primary conductor 110 according to the first embodiment.
  • the reference line located immediately above or immediately below the central portion in the width direction of the primary conductor 110 The magnetic flux density distribution on 1 was calculated by simulation analysis.
  • the pair of magnetic members 170 is not disposed.
  • FIG. 9 is a cross-sectional view schematically showing a magnetic field generated around the primary conductor according to the first embodiment.
  • FIG. 10 shows the distance from the front surface or the back surface of the primary conductor and the width direction of the primary conductor on the reference line located immediately above or directly below the central portion in the width direction of the primary conductor according to Comparative Example 1 and Example 1. It is a graph which shows the relationship with the magnetic flux density of (X-axis direction).
  • the vertical axis represents the magnetic flux density (mT)
  • the horizontal axis represents the distance (mm) from the front surface 110s or the back surface 110t of the primary conductor 110.
  • the data of the primary conductor 110 according to the first embodiment is indicated by a solid line
  • the data of the primary conductor 110 according to the comparative example 1 is indicated by a dotted line.
  • the magnetic field 110e is generated by the current 10 flowing through the primary conductor 110 located on the left side of the through hole 110h according to the so-called right-handed screw law. Similarly, a magnetic field 110e is generated by the current 10 flowing through the primary conductor 110 located on the right side of the through hole 110h.
  • LZ and the magnetic flux density RZ in the Z-axis direction due to the magnetic field 110e generated by the current 10 flowing through the primary conductor 110 located on the right side of the through hole 110h cancel each other.
  • the magnetic flux density RX in the X-axis direction due to the generated magnetic field 110e is combined.
  • LZ and the magnetic flux density RZ in the Z-axis direction due to the magnetic field 110e generated by the current 10 flowing through the primary conductor 110 located on the right side of the through hole 110h cancel each other.
  • the magnetic flux density RX in the X-axis direction due to the generated magnetic field 110e is combined.
  • the magnetic flux density in the X-axis direction on the reference line 1 located immediately above the central portion in the width direction of the primary conductor 110 according to Comparative Example 1 is the distance from the surface 110 s of the primary conductor 110. Decreases as the value increases.
  • the magnetic flux density in the X-axis direction on the reference line 1 located immediately above the central portion in the width direction of the primary conductor 110 according to the first embodiment reaches a distance of 4 mm from the surface 110s of the primary conductor 110. The distance increases as the distance increases, and is substantially constant at a position of 4 mm to 10 mm from the surface 110 s of the primary conductor 110.
  • the magnetic flux density in the X-axis direction on the reference line 1 located immediately above the central portion in the width direction of the primary conductor 110 according to Example 1 is the comparative example regardless of the distance from the surface 110s of the primary conductor 110. It is lower than the magnetic flux density in the X-axis direction on the reference line 1 located immediately above the central portion in the width direction of the primary conductor 110. This is because no current flows through the through hole 110h.
  • the magnetic flux density in the X-axis direction on the reference line 1 located immediately below the center in the width direction of the primary conductor 110 according to Comparative Example 1 increases as the distance from the back surface 110t of the primary conductor 110 increases. It is falling.
  • the magnetic flux density in the X-axis direction on the reference line 1 located immediately below the central portion in the width direction of the primary conductor 110 according to the first embodiment reaches a distance of 4 mm from the back surface 110t of the primary conductor 110. The distance increases as the distance increases, and is substantially constant at a position of 4 mm to 10 mm from the back surface 110 t of the primary conductor 110.
  • the magnetic flux density in the X-axis direction on the reference line 1 located immediately below the central portion in the width direction of the primary conductor 110 according to Example 1 is the comparative example regardless of the distance from the back surface 110t of the primary conductor 110. It is lower than the magnetic flux density in the X-axis direction on the reference line 1 located immediately below the central portion in the width direction of the primary conductor 110. This is because no current flows through the through hole 110h.
  • the first magnetic sensor 120a is disposed at a position immediately above the through hole 110h of the primary conductor 110, thereby providing the first magnetic sensor.
  • the magnetic flux density acting on 120a can be reduced. Therefore, even when a large current flows through the primary conductor 110, it is possible to suppress the magnetic saturation of the magnetoresistive element of the first magnetic sensor 120a.
  • the second magnetic sensor 120b by arranging the second magnetic sensor 120b at a position directly below the through hole 110h of the primary conductor 110, the magnetic flux density acting on the second magnetic sensor 120b can be reduced. Therefore, even when a large current flows through the primary conductor 110, it is possible to suppress magnetic saturation of the magnetoresistive element of the second magnetic sensor 120b.
  • FIG. 11 is a graph showing the relationship between the magnetic flux density acting on the magnetoresistive element and the output voltage of the magnetoresistive element.
  • the vertical axis represents the output voltage of the magnetoresistive element
  • the horizontal axis represents the magnetic flux density acting on the magnetoresistive element.
  • the output voltage of the magnetoresistive element increases in proportion to the increase of the magnetic flux density acting on the magnetoresistive element.
  • the output voltage of the magnetoresistive element hardly increases even if the magnetic flux density acting on the magnetoresistive effect element increases.
  • the first magnetism is reduced by reducing the magnetic flux density acting on the magnetoresistive element with a simple structure in which the through hole 110h is provided in the primary conductor 110 without using a complicated circuit.
  • the sensor 120a and the second magnetic sensor 120b can be operated in the first region T 1.
  • the input dynamic range of the current sensor 100 can be expanded, and a large current can be accurately measured by the current sensor 100.
  • the first magnetic sensor 120a is disposed at a position immediately above the through hole 110h of the primary conductor 110
  • the second magnetic sensor 120b is disposed at a position immediately below the through hole 110h of the primary conductor 110, thereby Since the magnetic flux density in the X-axis direction and the Z-axis direction acting on each of the magnetic sensor 120a and the second magnetic sensor 120b can be reduced, the strength of the magnetic field applied to each of the first magnetic sensor 120a and the second magnetic sensor 120b. It is possible to suppress the occurrence of variations. As a result, the current sensor 100 can stably measure the magnitude of the current to be measured.
  • a position of 4 mm to 10 mm from the front surface 110s or the back surface 110t of the primary conductor 110 Is a robust region in which the magnetic flux density in the X-axis direction is substantially constant.
  • the first magnetic sensor 120a is positioned directly above the through hole 110h with the first printed board 130a interposed between the primary conductor 110 and the first magnetic sensor 120a.
  • the sensor 120a is located in the robust area. That is, the thickness of the first printed circuit board 130a is appropriately set so that the first magnetic sensor 120a is positioned in the robust region.
  • the second magnetic sensor 120b is located directly below the through hole 110h with the second printed circuit board 130b sandwiched between the primary conductor 110 and the second magnetic sensor 120b. Is located in the robust region. That is, the thickness of the second printed circuit board 130b is appropriately set so that the second magnetic sensor 120b is located in the robust region.
  • each of the first magnetic sensor 120a and the second magnetic sensor 120b By positioning each of the first magnetic sensor 120a and the second magnetic sensor 120b within the robust region, it is possible to stably cause variations in the strength of the magnetic field applied to each of the first magnetic sensor 120a and the second magnetic sensor 120b. Can be suppressed. As a result, the current sensor 100 can more stably measure the magnitude of the current to be measured.
  • the primary conductor 110 is connected.
  • the phase of the detection value of the first magnetic sensor 120a is opposite to the phase of the detection value of the second magnetic sensor 120b.
  • the strength of the magnetic field detected by the first magnetic sensor 120a is a positive value
  • the strength of the magnetic field detected by the second magnetic sensor 120b is a negative value.
  • the detection value of the first magnetic sensor 120a and the detection value of the second magnetic sensor 120b are transmitted to the calculation unit 190.
  • the calculation unit 190 subtracts the detection value of the second magnetic sensor 120b from the detection value of the first magnetic sensor 120a. As a result, the absolute value of the detection value of the first magnetic sensor 120a and the absolute value of the detection value of the second magnetic sensor 120b are added. From this addition result, the value of the current flowing through the primary conductor 110 is calculated.
  • the primary conductor 110, the first printed board 130a, and the second printed board 130b are located between the first magnetic sensor 120a and the second magnetic sensor 120b.
  • the external magnetic field source cannot be physically located between the first magnetic sensor 120a and the second magnetic sensor 120b.
  • the direction of the magnetic field component in the direction of the detection axis of the magnetic field applied to the first magnetic sensor 120a from the external magnetic field source and the detection axis of the magnetic field applied to the second magnetic sensor 120b from the external magnetic field source is the same direction. Therefore, if the strength of the external magnetic field detected by the first magnetic sensor 120a is a positive value, the strength of the external magnetic field detected by the second magnetic sensor 120b is also a positive value.
  • the calculation unit 190 subtracts the detection value of the second magnetic sensor 120b from the detection value of the first magnetic sensor 120a, thereby detecting the absolute value of the detection value of the first magnetic sensor 120a and the detection of the second magnetic sensor 120b.
  • the absolute value of the value is subtracted. Thereby, the magnetic field from the external magnetic field source is hardly detected. That is, the influence of the external magnetic field is reduced.
  • the directions of the detection axes with positive detection values may be opposite to each other (opposite 180 °).
  • the strength of the external magnetic field detected by the first magnetic sensor 120a is a positive value
  • the strength of the external magnetic field detected by the second magnetic sensor 120b is a negative value.
  • the phase of the detection value of the first magnetic sensor 120a and the phase of the detection value of the second magnetic sensor 120b are in phase.
  • an adder or an addition amplifier is used as the calculation unit 190 instead of the differential amplifier.
  • the detected value of the first magnetic sensor 120a and the detected value of the second magnetic sensor 120b are added by an adder or an adding amplifier, thereby obtaining the absolute value of the detected value of the first magnetic sensor 120a.
  • the absolute value of the detection value of the second magnetic sensor 120b is subtracted. Thereby, the magnetic field from the external magnetic field source is hardly detected. That is, the influence of the external magnetic field is reduced.
  • the strength of the magnetic field generated by the current flowing through the primary conductor 110 is obtained by adding the detection value of the first magnetic sensor 120a and the detection value of the second magnetic sensor 120b by an adder or an addition amplifier.
  • the absolute value of the detection value of the first magnetic sensor 120a and the absolute value of the detection value of the second magnetic sensor 120b are added. From this addition result, the value of the current flowing through the primary conductor 110 is calculated.
  • an adder or an addition amplifier may be used as the calculation unit in place of the differential amplifier while the input / output characteristics of the first magnetic sensor 120a and the second magnetic sensor 120b have opposite polarities.
  • each of the first magnetic sensor 120 a and the second magnetic sensor 120 b is surrounded by a pair of magnetic members 170.
  • the external magnetic field that is an error factor can be suppressed from reaching each of the first magnetic sensor 120a and the second magnetic sensor 120b.
  • each of the first magnetic sensor 120a and the second magnetic sensor 120b can be prevented from detecting an unnecessary external magnetic field. That is, the pair of magnetic members 170 functions as a magnetic shield.
  • FIG. 12 is a perspective view showing an appearance of the current sensor according to Comparative Example 2.
  • FIG. FIG. 13 is a side view of the current sensor of FIG. 12 as viewed from the direction of the arrow XIII.
  • FIG. 14 is a cross-sectional view of the current sensor of FIG. 13 as viewed from the direction of arrows XIV-XIV.
  • the current sensor 200 includes a pair of magnetic members 270 each having a U-shape when the primary conductor 110 is viewed from the direction in which current flows (Y-axis direction). Is provided.
  • the pair of magnetic members 270 includes a first magnetic member 271 and a second magnetic member 272.
  • the pair of magnetic members 270 has a rectangular shape in which a gap 273 is provided between the ends when viewed from the direction in which the current flowing through the primary conductor 110 flows (Y-axis direction).
  • the pair of magnetic members 270 includes the first circuit board 160a, the second circuit board 160b, and the portion of the primary conductor 110 sandwiched between the first circuit board 160a and the second circuit board 160b. Is surrounded by a space.
  • Each of the first magnetic member 271 and the second magnetic member 272 is a first plate-like portion and a second plate-like portion and a third plate-like shape that are orthogonal to the first plate-like portion and face each other. Part. The first plate-like portions of the first magnetic member 271 and the second magnetic member 272 and the primary conductor 110 are positioned in parallel to each other.
  • Each of the two air gaps 273 extends from one end of the pair of magnetic members 270 to the other end in the direction in which the current flows through the primary conductor 110 (Y-axis direction).
  • Each of the two gaps 273 is located at the center in the Z-axis direction on both sides of the rectangular shape formed by the pair of magnetic members 270 when viewed from the direction (Y-axis direction) in which the current flowing through the primary conductor 110 flows. is doing.
  • the center position of the rectangular shape formed by the pair of magnetic members 270 and the position of the through hole 110h of the primary conductor 110 overlap each other when viewed from the direction in which the current flowing through the primary conductor 110 flows (Y-axis direction). .
  • FIG. 15 is a perspective view showing an appearance of a current sensor according to Comparative Example 3.
  • FIG. 16 is a plan view of the current sensor of FIG. 15 viewed from the direction of the arrow XVI.
  • FIG. 17 is a cross-sectional view of the current sensor of FIG. 16 viewed from the direction of the arrow XVII-XVII.
  • the current sensor 300 has a pair of magnetic members 370 each having a U shape when the primary conductor 110 is viewed from the direction in which the current flows (Y-axis direction). Is provided.
  • the pair of magnetic members 370 includes a first magnetic member 371 and a second magnetic member 372.
  • the pair of magnetic members 370 has a rectangular shape in which a gap 373 is provided between the ends when viewed from the direction in which the current flowing through the primary conductor 110 flows (Y-axis direction). Surrounding the conductor 110 and the two magnetic sensors.
  • the pair of magnetic members 370 includes a first circuit board 160a, a second circuit board 160b, and a portion of the primary conductor 110 sandwiched between the first circuit board 160a and the second circuit board 160b. Is surrounded by a space.
  • Each of the first magnetic member 371 and the second magnetic member 372 has a first plate-like portion and a second plate-like portion and a third plate-like shape that are orthogonal to the first plate-like portion and face each other. Part. The first plate-like portions of the first magnetic member 371 and the second magnetic member 372 and the primary conductor 110 are positioned in parallel to each other.
  • Each of the two gaps 373 extends from one end of the pair of magnetic members 370 to the other end in the direction in which the current flows through the primary conductor 110 (Y-axis direction).
  • Each of the two air gaps 373 is the center in the X-axis direction of each of the upper and lower sides of the rectangular shape formed by the pair of magnetic members 370 when viewed from the direction in which the current flowing through the primary conductor 110 flows (Y-axis direction).
  • the size of the gaps 173, 273, and 373 was 1 mm.
  • the size of the gaps 173, 273, 373 is the shortest distance between the first magnetic members 171, 271, 371 and the second magnetic members 172, 272, 372.
  • the outer shape of the pair of magnetic members 170, 270, and 370 was 25.0 mm in length, 23.0 mm in width, and 20.0 mm in height.
  • the plate thickness of each of the first magnetic members 171, 271 and 371 and the second magnetic members 172, 272 and 372 was 0.5 mm.
  • the material of each of the first magnetic members 171, 271, 371 and the second magnetic members 172, 272, 372 was 42 alloy (42Ni).
  • the outer dimensions of the primary conductor 110 were 80.0 mm in length, 13.0 mm in width, and 1.5 mm in height.
  • the material of the primary conductor 110 was oxygen-free copper (C1020).
  • FIG. 18 is a schematic diagram showing a state in which a pair of magnetic shields are uniformly magnetized. As shown in FIG. 18, when a current flows through the primary conductor 110 from the front side of the drawing to the back side of the drawing, the pair of magnetic members 170, 270, and 370 are paired with the pair of magnetic members 170, 270. , 370 is magnetized in the direction indicated by arrow 2 so as to circulate clockwise.
  • FIG. 19 is a diagram showing a reference line and a center point in the Z-axis direction in the simulation analysis. As shown in FIG. 19, the magnetic flux density distribution on the reference line 1 located immediately above or directly below the central portion in the width direction of the primary conductor 110 was calculated by simulation analysis. The center position O in the thickness direction of the primary conductor 110 was set as the origin in the Z-axis direction.
  • FIG. 20 shows the center of the primary conductor in the thickness direction on the reference line located immediately above or directly below the central portion in the width direction of the primary conductor in the current sensors according to Example 2, Comparative Example 2 and Comparative Example 3. It is a graph which shows the relationship between the distance from a position, and the magnetic flux density of the width direction (X-axis direction) of a primary conductor.
  • FIG. 21 shows the center in the thickness direction of the primary conductor on the reference line located immediately above or directly below the center portion in the width direction of the primary conductor in the current sensors according to Example 2, Comparative Example 2 and Comparative Example 3. It is a graph which shows the relationship between the distance from a position, and the magnetic flux density of the length direction (Y-axis direction) of a primary conductor.
  • FIG. 22 shows the center in the thickness direction of the primary conductor on the reference line located immediately above or directly below the central portion in the width direction of the primary conductor in the current sensors according to Example 2, Comparative Example 2 and Comparative Example 3. It is a graph which shows the relationship between the distance from a position, and the magnetic flux density of the thickness direction (Z-axis direction) of a primary conductor.
  • the vertical axis represents the normalized magnetic flux density
  • the horizontal axis represents the distance (mm) in the Z-axis direction from the center position O in the thickness direction of the primary conductor 110.
  • the data of the current sensor 100 according to the second embodiment is indicated by a solid line
  • the data of the current sensor 200 according to the comparative example 2 is indicated by a dotted line
  • the data of the current sensor 300 according to the comparative example 3 is indicated by a one-dot chain line. Show.
  • the arrangement positions 121 of the AMR elements of the first magnetic sensor 120a and the second magnetic sensor 120b are shown.
  • each of the current sensor 200 according to the comparative example 2 and the current sensor 300 according to the comparative example 3 includes the first magnetic sensor 120 a and the second magnetic sensor 120 b at the arrangement position 121 of the AMR element.
  • the normalized magnetic flux density Bx in the detection axis direction (X-axis direction) was about 0.3 to 0.5 in absolute value.
  • the normalized magnetic flux density Bx in the detection axis direction (X-axis direction) of each of the first magnetic sensor 120a and the second magnetic sensor 120b is 0 at the AMR element arrangement position 121. .1 or less, which is smaller than the current sensor 200 according to Comparative Example 2 and the current sensor 300 according to Comparative Example 3.
  • each of the current sensor 100 according to the second embodiment, the current sensor 200 according to the second comparative example, and the current sensor 300 according to the third comparative example is arranged in the Y-axis direction at the arrangement position 121 of the AMR element.
  • Each of the normalized magnetic flux density By and the normalized magnetic flux density Bz in the Z-axis direction was substantially 0, and no difference was recognized.
  • FIG. 23 is a graph showing a relationship between an input current value and a sensor output voltage in the current sensor according to the second embodiment.
  • FIG. 24 is a graph showing an enlarged view of the vicinity 3 of the input current value in FIG.
  • FIG. 25 is a graph showing the relationship between the input current value and the sensor output voltage in the current sensor according to Comparative Example 2.
  • FIG. 26 is an enlarged graph showing the vicinity 3 of the input current value 0A in FIG.
  • FIG. 27 is a graph showing the relationship between the input current value and the sensor output voltage in the current sensor according to Comparative Example 3.
  • FIG. 28 is an enlarged graph showing the vicinity 3 of the input current value 0A in FIG. 23 to 28, the vertical axis represents the sensor output voltage (V), and the horizontal axis represents the input current (A).
  • the current sensor 200 according to Comparative Example 2 and the current sensor 300 according to Comparative Example 3 each have an input current value.
  • the sensor output voltage greatly deviated in the vicinity 3 of 0A.
  • the current sensor 100 according to Example 2 when the input current flowing through the primary conductor 110 was swept positively and negatively, no deviation in sensor output voltage was observed in the vicinity 3 of the input current value of 0A.
  • FIG. 29 is a graph showing hysteresis rates of the current sensor 100 according to the second embodiment, the current sensor 200 according to the second comparative example, the current sensor 300 according to the third comparative example, and the current sensor according to the fourth comparative example.
  • the vertical axis represents the hysteresis rate (% FS) and the horizontal axis represents the sample name.
  • the current sensor according to Comparative Example 4 differs from the current sensor according to Example 1 only in that a pair of magnetic members is not provided.
  • the hysteresis rate is a 100-minute ratio of the difference in sensor output voltage when the input current value is 0 A to the sensor output voltage when the input current value is ⁇ 300 A.
  • each of the current sensor 200 according to the comparative example 2 and the current sensor 300 according to the comparative example 3 has a hysteresis rate of 1.8% or more, whereas the current according to the second example.
  • the hysteresis rate was reduced to 0.2%, which was substantially the same as the hysteresis rate of 0.1% of the current sensor according to Comparative Example 4 in which the pair of magnetic members were not provided.
  • each of the two air gaps 173 is 1 as viewed from the direction in which the current flowing through the primary conductor 110 flows (Y-axis direction).
  • the first magnetic sensor 120a and the second magnetic sensor 120b are positioned in the robust region, high accuracy is not required for the assembly of the current sensor 100.
  • the sensor 100 can be easily manufactured.
  • the current sensor 400 according to the second embodiment is different from the current sensor according to the first embodiment only in that it further includes another pair of magnetic members, and thus the description of the other configurations will not be repeated.
  • FIG. 30 is a cross-sectional view showing a configuration of a current sensor according to Embodiment 2 of the present invention. 30 is a cross-sectional view of the current sensor as viewed from the same direction as in FIG.
  • the current sensor 400 includes another pair of magnetic elements each having an L shape when the primary conductor 110 is viewed from the direction in which the current flows (Y-axis direction).
  • a body member 470 is further provided.
  • the other pair of magnetic members 470 is composed of a third magnetic member 471 and a fourth magnetic member 472.
  • the other pair of magnetic members 470 has a rectangular shape in which a gap 473 is provided between the ends when viewed from the direction in which the current flowing through the primary conductor 110 flows (Y-axis direction),
  • the pair of magnetic members 170 is surrounded by a distance from the pair of magnetic members 170.
  • the gaps 473 of the other pair of magnetic members 470 are located outside the corners 171r and 172r of the pair of magnetic members 170, respectively.
  • Each of the third magnetic member 471 and the fourth magnetic member 472 has a third plate-like portion and a fourth plate-like portion orthogonal to the third plate-like portion.
  • the third plate-like portion of each of the third magnetic member 471 and the fourth magnetic member 472 and the primary conductor 110 are positioned in parallel to each other.
  • the third plate-like portion of the third magnetic member 471 and the first plate-like portion of the second magnetic member 172 are located in parallel with a distance from each other.
  • the third plate-like portion of the fourth magnetic body member 472 and each first plate-like portion of the first magnetic body member 171 are positioned in parallel with an interval therebetween.
  • the fourth plate-like portion of the third magnetic member 471 and the second plate-like portion of the first magnetic member 171 are located in parallel with a distance from each other.
  • the fourth plate-like portion of the fourth magnetic body member 472 and each second plate-like portion of the second magnetic body member 172 are positioned in parallel with a space between each other.
  • Each of the two gaps 473 extends from one end of the other pair of magnetic members 470 to the other end in the direction in which the current flows through the primary conductor 110 (Y-axis direction).
  • Each of the two gaps 473 is located at a diagonal of a rectangular shape formed by the other pair of magnetic members 470 when viewed from the direction in which the current flowing through the primary conductor 110 flows (Y-axis direction).
  • the center position of the rectangular shape formed by the other pair of magnetic members 470 overlaps the position of the through hole 110h of the primary conductor 110. ing.
  • Each of the third magnetic member 471 and the fourth magnetic member 472 is made of permalloy, but the material of each of the third magnetic member 471 and the fourth magnetic member 472 is not limited to permalloy, and is soft. Any magnetic material having high magnetic permeability and saturation magnetic flux density, such as iron steel, silicon steel, electromagnetic steel, nickel alloy, iron alloy, or ferrite, may be used.
  • each of the third magnetic member 471 and the fourth magnetic member 472 is formed by pressing a thin plate.
  • the formation method of each of the third magnetic member 471 and the fourth magnetic member 472 is not limited to this, and each of the third magnetic member 471 and the fourth magnetic member 472 is formed by a method such as cutting or casting. May be.
  • each of the first magnetic sensor 120a and the second magnetic sensor 120b includes a pair of magnetic members 170 and another pair of magnetic members 470. Therefore, it is possible to further suppress the external magnetic field, which is an error factor, from reaching each of the first magnetic sensor 120a and the second magnetic sensor 120b. As a result, each of the first magnetic sensor 120a and the second magnetic sensor 120b can be prevented from detecting an unnecessary external magnetic field. That is, each of the pair of magnetic members 170 and the other pair of magnetic members 470 functions as a magnetic shield.
  • the gaps 473 of the other pair of magnetic members 470 are positioned outside the corners 171r and 172r of the pair of magnetic members 170, so that the first magnetic sensor 120a and the second magnetic member 120a.
  • the sensor 120b can be completely surrounded by a pair of magnetic members 170 and another pair of magnetic members 470. As a result, each of the first magnetic sensor 120a and the second magnetic sensor 120b can be prevented from detecting an unnecessary external magnetic field.
  • each of the two gaps 173 has a rectangular shape formed by the pair of magnetic members 170 when viewed from the direction in which the current flowing through the primary conductor 110 flows (Y-axis direction). By being positioned diagonally, measurement errors due to the magnetic field generated by the residual magnetization of the pair of magnetic members 170 can be reduced.
  • Embodiment 3 of the present invention a current sensor according to Embodiment 3 of the present invention will be described.
  • the current sensor 500 according to the third embodiment is different from the current sensor according to the second embodiment only in that two magnetic sensors are mounted on one printed circuit board, and thus the description of the other configurations will not be repeated.
  • FIG. 31 is a cross-sectional view showing a configuration of a current sensor according to Embodiment 3 of the present invention.
  • FIG. 31 shows in the cross-sectional view which looked at the current sensor from the same direction as FIG.
  • the printed circuit board 530c is held in a state where the primary conductor 110 is inserted into the through hole 530h. That is, the printed circuit board 530 c is positioned perpendicular to the primary conductor 110.
  • the first magnetic sensor 120a and the second magnetic sensor 120b are mounted on a printed circuit board 530c together with a differential amplifier and a passive element.
  • the differential amplifier and the passive element are not shown.
  • the differential amplifier and the passive element may be mounted on a printed board different from the printed board 530c on which the first magnetic sensor 120a and the second magnetic sensor 120b are mounted.
  • the first magnetic sensor 120a and the second magnetic sensor 120b are located on opposite sides of the through hole 530h. Each of the first magnetic sensor 120a and the second magnetic sensor 120b is located at an interval from the through hole 530h.
  • the first magnetic sensor 120a is positioned directly above the through hole 530h, and the second printed circuit board 130b is positioned directly below the through hole 530h. . That is, the first magnetic sensor 120a and the second magnetic sensor 120b are located on opposite sides of the primary conductor 110.
  • each of the first magnetic sensor 120a and the second magnetic sensor 120b is located in the robust region. That is, the interval between each of the first magnetic sensor 120a and the second magnetic sensor 120b and the through hole 530h is appropriately set so that the first magnetic sensor 120a and the second magnetic sensor 120b are positioned in the robust region.
  • the direction (magnetic direction) of the detection axis of each of the first magnetic sensor 120a and the second magnetic sensor 120b is the width direction (X-axis direction) of the primary conductor 110.
  • the magnetic flux density in the X-axis direction, the Y-axis direction, and the Z-axis direction acting on each of the first magnetic sensor 120a and the second magnetic sensor 120b can be reduced. Variations in the strength of the magnetic field applied to the first magnetic sensor 120a and the second magnetic sensor 120b can be suppressed. As a result, the current sensor 500 can stably measure the magnitude of the current to be measured.
  • each of the two gaps 173 has a rectangular shape formed by the pair of magnetic members 170 when viewed from the direction in which the current flowing through the primary conductor 110 flows (Y-axis direction). By being positioned diagonally, measurement errors due to the magnetic field generated by the residual magnetization of the pair of magnetic members 170 can be reduced.
  • the gaps 473 of the other pair of magnetic members 470 are positioned outside the corners 171r and 172r of the pair of magnetic members 170, so that the first magnetic sensor 120a and the second magnetic member 120a.
  • the sensor 120b can be completely surrounded by a pair of magnetic members 170 and another pair of magnetic members 470. As a result, each of the first magnetic sensor 120a and the second magnetic sensor 120b can be prevented from detecting an unnecessary external magnetic field.
  • the current sensor 600 according to the fourth embodiment differs from the current sensor according to the third embodiment only in that the printed circuit board and the magnetic member are configured to be detachable from the primary conductor. Will not repeat the description.
  • FIG. 32 is a cross-sectional view showing a state where a printed circuit board and a magnetic member are attached to a primary conductor in a current sensor according to Embodiment 4 of the present invention.
  • FIG. 33 is a cross-sectional view illustrating a state before the printed circuit board and the magnetic member are attached to the primary conductor in the current sensor according to the fourth embodiment of the present invention. 32 and 33 are shown in a cross-sectional view of the current sensor as viewed from the same direction as in FIG.
  • the first magnetic member 171 of the pair of magnetic members 170 and the other pair of magnetic members 470 As shown in FIGS. 31 and 32, in the current sensor 600 according to the fourth embodiment of the present invention, the first magnetic member 171 of the pair of magnetic members 170 and the other pair of magnetic members 470.
  • the third magnetic body member 471 and the printed board 630c are joined together by a first joining member 681 made of resin or adhesive, and are integrated.
  • the second magnetic member 172 of the pair of magnetic members 170 and the fourth magnetic member 472 of the other pair of magnetic members 470 are made of a resin or an adhesive. They are joined together by 682 and integrated.
  • the peripheral surface of the printed circuit board 630c and the inner surface of the first magnetic member 171 are joined to each other by the first joining member 681.
  • the outer surface of the second plate-like portion of the first magnetic member 171 and the inner surface of the fourth plate-like portion of the third magnetic member 471 facing each other are joined to each other by the first joining member 681.
  • the outer surface of the second plate-like portion of the second magnetic member 172 and the inner surface of the fourth plate-like portion of the fourth magnetic member 472 facing each other are joined to each other by the second joining member 682.
  • a through groove 630h is provided from the end surface side of the peripheral surface of the printed circuit board 630c that is not surrounded by the first magnetic member 171 and the third magnetic member 471 to the opposite end surface.
  • a gap is provided between the printed board 630c and the third plate-like portion of the third magnetic member 471 so that the first plate-like portion of the second magnetic member 172 can be inserted.
  • the primary conductor 110 is inserted into the through groove 630h of the printed board 630c.
  • the printed circuit board 630 c, the first magnetic member 171, and the third magnetic member 471 are moved closer to the primary conductor 110 in the direction indicated by the arrow 61.
  • the first plate-like portion of the second magnetic member 172 is inserted in the direction indicated by the arrow 62 so that the first plate-like portion of the second magnetic member 172 is inserted into the gap between the printed circuit board 630c and the third plate-like portion of the third magnetic member 471.
  • the second magnetic member 172 and the fourth magnetic member 472 are brought closer to the primary conductor 110.
  • the printed circuit board 630c and the magnetic member are attached to the primary conductor 110, the printed circuit board 630c is held with the primary conductor 110 inserted in the through groove 630h. . That is, the printed circuit board 630 c is positioned perpendicular to the primary conductor 110.
  • each of the two gaps 173 and the two gaps 473 is filled with at least one of the first joining member 681 and the second joining member 682.
  • the printed circuit board 630c and the magnetic member are configured to be detachable from the primary conductor 110, so that the assembly and disassembly of the current sensor 600 is easy.
  • each of the two gaps 173 has a rectangular shape formed by a pair of magnetic members 170 when viewed from the direction in which the current flowing through the primary conductor 110 flows (Y-axis direction). By being positioned diagonally, measurement errors due to a magnetic field generated by the residual magnetization of the pair of magnetic members 170 can be reduced.
  • the gaps 473 of the other pair of magnetic members 470 are positioned outside the corners 171r and 172r of the pair of magnetic members 170, so that the first magnetic sensor 120a and the second magnetic member 120a.
  • the sensor 120b can be completely surrounded by a pair of magnetic members 170 and another pair of magnetic members 470. As a result, each of the first magnetic sensor 120a and the second magnetic sensor 120b can be prevented from detecting an unnecessary external magnetic field.

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

Abstract

L'invention concerne un capteur de courant qui comporte : un conducteur principal (110) dans lequel circule un courant à mesurer ; au moins un capteur magnétique (120a, 120b) qui détecte l'intensité d'un champ magnétique généré au moyen du courant circulant dans le conducteur principal (110) ; et une paire d'éléments de matériau magnétique (170), chaque élément présentant une forme de L lorsqu'il est vu depuis la direction dans laquelle circule le courant. La paire d'éléments de matériau magnétique (170) forme une forme rectangulaire lorsqu'elle est vue depuis la direction dans laquelle circule le courant, ladite forme rectangulaire comportant des espaces (173) entre les parties extrémités d'éléments de matériau magnétique respectifs, et entoure le conducteur principal (110) et les capteurs magnétiques (120a, 120b).
PCT/JP2015/073807 2014-09-05 2015-08-25 Capteur de courant WO2016035606A1 (fr)

Applications Claiming Priority (4)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109416377A (zh) * 2016-07-15 2019-03-01 阿尔卑斯电气株式会社 电流传感器
EP3692379A4 (fr) * 2017-10-02 2021-11-03 ABB Schweiz AG Absorbeur de flux pour dispositif de ligne électrique
US11555835B2 (en) * 2018-11-01 2023-01-17 Murata Manufacturing Co., Ltd. Current sensor

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Publication number Priority date Publication date Assignee Title
JP2001281270A (ja) * 2000-03-31 2001-10-10 Sumitomo Special Metals Co Ltd 分割型電流検出器
JP2007033303A (ja) * 2005-07-28 2007-02-08 Mitsubishi Electric Corp 電流検出装置
JP2012052980A (ja) * 2010-09-03 2012-03-15 Alps Green Devices Co Ltd 電流センサ
JP2013015371A (ja) * 2011-07-01 2013-01-24 Toshiba Toko Meter Systems Co Ltd 電流検出装置及び電力量計

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Publication number Priority date Publication date Assignee Title
JP2001281270A (ja) * 2000-03-31 2001-10-10 Sumitomo Special Metals Co Ltd 分割型電流検出器
JP2007033303A (ja) * 2005-07-28 2007-02-08 Mitsubishi Electric Corp 電流検出装置
JP2012052980A (ja) * 2010-09-03 2012-03-15 Alps Green Devices Co Ltd 電流センサ
JP2013015371A (ja) * 2011-07-01 2013-01-24 Toshiba Toko Meter Systems Co Ltd 電流検出装置及び電力量計

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109416377A (zh) * 2016-07-15 2019-03-01 阿尔卑斯电气株式会社 电流传感器
EP3692379A4 (fr) * 2017-10-02 2021-11-03 ABB Schweiz AG Absorbeur de flux pour dispositif de ligne électrique
US11353480B2 (en) 2017-10-02 2022-06-07 Abb Schweiz Ag Flux absorber for power line device
US11555835B2 (en) * 2018-11-01 2023-01-17 Murata Manufacturing Co., Ltd. Current sensor

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