WO2014123007A1 - Capteur de courant électrique - Google Patents

Capteur de courant électrique Download PDF

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Publication number
WO2014123007A1
WO2014123007A1 PCT/JP2014/051497 JP2014051497W WO2014123007A1 WO 2014123007 A1 WO2014123007 A1 WO 2014123007A1 JP 2014051497 W JP2014051497 W JP 2014051497W WO 2014123007 A1 WO2014123007 A1 WO 2014123007A1
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WO
WIPO (PCT)
Prior art keywords
bus bar
magnetic sensor
bar portion
current
sensor
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Application number
PCT/JP2014/051497
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English (en)
Japanese (ja)
Inventor
川浪　崇
Original Assignee
株式会社村田製作所
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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 JP2014560716A priority Critical patent/JPWO2014123007A1/ja
Publication of WO2014123007A1 publication Critical patent/WO2014123007A1/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
    • G01R15/207—Constructional details independent of the type of device used

Definitions

  • the present invention relates to a current sensor, and more particularly to a current sensor that detects the value of a current to be measured by measuring the strength of a magnetic field generated according to the current to be measured.
  • Patent Document 1 Japanese Unexamined Patent Application Publication No. 2008-151530 is a prior art document that discloses a semiconductor integrated circuit for magnetic field detection that can detect characteristic deterioration of a magnetoelectric conversion element such as a Hall element.
  • a bus bar serving as a current path is formed along the peripheral edge of the Hall element.
  • Patent Document 2 discloses a sensor chip in which an output signal is proportional to a current to be measured and is not easily disturbed by temperature and an external magnetic field and aims to maintain a stable sensitivity.
  • the sensor chip described in Patent Document 2 is provided with a Wheatstone bridge type bridge circuit for measuring the gradient of the magnetic field strength.
  • the sensor chip has first to fourth magnetic sensitive resistors arranged in first and second ranges spaced from the central axis.
  • the first magnetic sensitive resistor and the second magnetic sensitive resistor are connected in series to form a first bridge shunt, and the third magnetic sensitive resistor and the fourth magnetic sensitive resistor are connected in series. Forming a second bridge shunt.
  • the first and fourth magnetic sensitive resistors are arranged in the first range
  • the second and third magnetic sensitive resistors are arranged in the second range
  • the first and fourth magnetic sensitive resistors and the second and third magnetic sensitive resistors arranged in the second range are arranged symmetrically with respect to the central axis.
  • a magnetic field generated according to the current to be measured is detected using one Hall element, and thus may malfunction due to an external magnetic field.
  • the strength of the magnetic field detected by the first to fourth magnetic sensitive resistors is inversely proportional to the square of the distance from the bus bar. Therefore, it is necessary to accurately arrange the first to fourth magnetic sensitive resistors at desired positions with respect to the bus bar, and it is difficult to manufacture the sensor chip.
  • An external magnetic field having a strength inversely proportional to the square of is applied.
  • the external magnetic field in the first and fourth magnetic sensitive resistors arranged in the first range and the second and third magnetic sensitive resistors arranged in the second range Since the distance from the source is different, the external magnetic field generated from the external magnetic field source affects the output signal of the sensor chip.
  • each path is used to accurately detect the value of the current flowing through each path.
  • the influence of the magnetic field generated by the flowing current has been an obstacle.
  • the present invention has been made in view of the above problems, and an object thereof is to provide a current sensor that can reduce the influence of an external magnetic field and can be easily manufactured.
  • the current sensor according to the present invention includes a bus bar through which a current to be measured flows, and a first magnetic sensor and a second magnetic sensor that detect the strength of a magnetic field generated by the current flowing through the bus bar.
  • the bus bars are electrically connected in parallel with each other, and are positioned in parallel between the first bus bar portion and the second bus bar portion and spaced in parallel with each other, and between the first bus bar portion and the second bus bar portion.
  • a first bus bar portion and a third bus bar portion extending in parallel with an interval to each of the first bus bar portion and the second bus bar portion. The direction in which the current flows through the first bus bar portion and the direction in which the current flows through the second bus bar portion are the same.
  • the direction in which the current flows through the first bus bar portion and the direction in which the current flows through the second bus bar portion are opposite to the direction in which the current flows through the third bus bar portion.
  • the first magnetic sensor is located between the first bus bar portion and the third bus bar portion.
  • the second magnetic sensor is located between the second bus bar portion and the third bus bar portion.
  • Each of the first magnetic sensor and the second magnetic sensor has a direction perpendicular to the direction in which the first bus bar portion, the second bus bar portion, and the third bus bar portion are aligned, and the extending direction of the third bus bar portion. And has a detection axis in the orthogonal direction.
  • the first magnetic sensor and the second magnetic sensor detect the strength of the magnetic field generated by the current flowing through the bus bar with an odd function input / output characteristic.
  • the current sensor further includes calculation means for calculating the value of the current by calculating each detection value of the first magnetic sensor and the second magnetic sensor.
  • the width dimension of the first bus bar part, the width dimension of the second bus bar part, and the width dimension of the third bus bar part are respectively adjacent to each other in the direction of the detection axis. It is 1.5 times or more of the dimension of the space
  • the interval between the first bus bar portion and the third bus bar portion and the interval between the second bus bar portion and the third bus bar portion are equal in the direction of the detection axis.
  • the first bus bar portion and the second bus bar portion are located in point symmetry with respect to the center point of the third bus bar portion in the cross section.
  • the first magnetic sensor and the second magnetic sensor are located in point symmetry with respect to the center point of the third bus bar portion in the cross section.
  • the first bus bar portion and the second bus bar portion are positioned symmetrically with respect to each other about the center line of the third bus bar portion in the direction of the detection axis in the cross section.
  • the first magnetic sensor and the second magnetic sensor are located symmetrically with respect to each other about the center line of the third bus bar portion in the direction of the detection axis in the cross section.
  • the first magnetic sensor is located closer to the first bus bar portion than the third bus bar portion.
  • the second magnetic sensor is located closer to the second bus bar portion than the third bus bar portion.
  • the first magnetic sensor is located closer to the third bus bar portion than the first bus bar portion.
  • the second magnetic sensor is located closer to the third bus bar portion than the second bus bar portion.
  • one end of the first bus bar portion, one end of the second bus bar portion, and one end of the third bus bar portion are connected to each other by the first connecting portion.
  • the other end of the first bus bar portion and the other end of the second bus bar portion are connected to each other by the second connecting portion.
  • the bus bar includes a first bus bar member that forms part of the first bus bar part and the third bus bar part, and a second bus bar that forms part of the second bus bar part and the third bus bar part. Member.
  • the first bus bar member and the second bus bar member are in contact with each other in the respective third bus bar portions.
  • the bus bar has an input terminal portion for inputting current to the first bus bar portion and the second bus bar portion, and an output terminal portion for outputting current from the third bus bar portion.
  • the input terminal portion and the output terminal portion are located on the same plane and extend in opposite directions in the direction of the detection axis.
  • 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 opposite phases with respect to the strength of the magnetic field generated by the current flowing through the bus bar.
  • the calculation means is a subtracter.
  • 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 with respect to the strength of the magnetic field generated by the current flowing through the bus bar.
  • the calculating means is an adder.
  • a current sensor that can reduce the influence of an external magnetic field can be easily manufactured.
  • FIG. 3 is a diagram schematically showing a generated magnetic field in a cross-sectional view of the current sensor according to the first embodiment of the present invention as viewed from the direction of arrows III-III in FIG. 1. It is sectional drawing which shows the state which has arrange
  • FIG. 8 is a diagram schematically showing a generated magnetic field in a cross-sectional view of the current sensor according to the second embodiment of the present invention as viewed from the direction of arrows VIII-VIII in FIG. 7.
  • FIG. 1 It is a magnetic flux diagram which shows the result of having simulated the magnetic flux density of the magnetic field which generate
  • 11 is a contour diagram showing the result of simulating the magnetic flux density of the magnetic field generated by the current to be measured flowing through the bus bar in the periphery of the bus bar of the current sensor according to the comparative example, as viewed in the direction of the arrow in FIG. is there.
  • 11 is a graph showing the relationship between the distance away from the central portion of the third bus bar portion in the left-right direction in FIG. 10 in the up-down direction in FIG. 10 and the magnetic flux density in the current sensor according to Embodiment 2 of the present invention.
  • FIG. 12 is a diagram schematically showing a generated magnetic field in the cross-sectional view of the current sensor according to the fifth embodiment of the present invention as viewed from the direction of the arrow XVIII-XVIII in FIG. It is a perspective view which shows the structure of the current sensor which concerns on Embodiment 6 of this invention.
  • FIG. 18 is a diagram schematically showing a generated magnetic field in the cross-sectional view of the current sensor according to the fifth embodiment of the present invention as viewed from the direction of the arrow XVIII-XVIII in FIG. It is a perspective view which shows the structure of the current sensor which concerns on Embodiment 6 of this invention.
  • FIG. 20 is a diagram schematically showing a generated magnetic field in the cross-sectional view of the current sensor according to the sixth embodiment of the present invention as viewed from the direction of the arrow XX-XX in FIG. It is a perspective view which shows the structure of the current sensor module which concerns on Embodiment 7 of this invention.
  • FIG. 1 is a perspective view showing a configuration of a current sensor according to Embodiment 1 of the present invention.
  • FIG. 2 is a perspective view showing a state in which the bus bar and the external wiring of the current sensor according to the present embodiment are connected.
  • the current sensor 100 includes a bus bar 110 through which a current to be measured flows.
  • the current sensor 100 also includes a first magnetic sensor 120 and a second magnetic sensor 121 that detect the strength of a magnetic field generated by the current to be measured flowing through the bus bar 110 with an odd function input / output characteristic.
  • the current sensor 100 includes a subtractor 130 that is a calculation unit that calculates the value of the current by subtracting the detection values of the first magnetic sensor 120 and the second magnetic sensor 121.
  • Bus bar 110 includes a first bus bar portion 111 and a second bus bar portion 112 that are electrically connected to each other in parallel and are spaced in parallel with each other.
  • the bus bar 110 extends in parallel to the first bus bar part 111 and the second bus bar part 112 at an interval between the first bus bar part 111 and the second bus bar part 112, and extends in parallel. 113 is further included.
  • the first bus bar portion 111, the second bus bar portion 112, and the third bus bar portion 113 have a rectangular parallelepiped shape and are arranged at equal intervals. One end in the longitudinal direction of the first bus bar portion 111, one end in the longitudinal direction of the second bus bar portion 112, and one end in the longitudinal direction of the third bus bar portion 113 are connected to each other by the first connecting portion 114.
  • the first connecting portion 114 has a rectangular parallelepiped shape, and extends in the direction in which the first bus bar portion 111, the second bus bar portion 112, and the third bus bar portion 113 are arranged. That is, the 1st connection part 114 is orthogonally crossed with the 1st bus-bar part 111, the 2nd bus-bar part 112, and the 3rd bus-bar part 113, respectively.
  • the shape of the 1st bus-bar part 111, the 2nd bus-bar part 112, the 3rd bus-bar part 113, and the 1st connection part 114 is not restricted to a rectangular parallelepiped shape, For example, a cylindrical shape may be sufficient.
  • the bus bar 110 has an E-shape when viewed in plan.
  • the shape of the bus bar 110 is not limited to this, and it is only necessary to include the first bus bar part 111, the second bus bar part 112, and the third bus bar part 113.
  • the bus bar 110 is made of aluminum.
  • the material of the bus bar 110 is not limited to this, and may be a metal such as silver or copper, or an alloy containing these metals.
  • the bus bar 110 may be subjected to a surface treatment.
  • 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 bus bar 110.
  • the bus bar 110 is formed by pressing a thin plate.
  • the method of forming the bus bar 110 is not limited to this, and the bus bar 110 may be formed by a method such as cutting or casting.
  • the direction 11 in which the current flows through the first bus bar portion 111 and the direction 12 in which the current flows through the second bus bar portion 112 are the same.
  • the direction 11 in which current flows through the first bus bar portion 111, the direction 12 in which current flows through the second bus bar portion 112, and the direction 13 in which current flows through the third bus bar portion 113 are opposite.
  • the external wiring includes an input wiring 170 branched to two input terminals and an output wiring 171 having an output terminal.
  • the two input terminals of the input wiring 170 and the output terminal of the output wiring 171 each have an annular portion.
  • a first through hole 111 h is provided at the other end in the longitudinal direction of the first bus bar portion 111, and the other end in the longitudinal direction of the second bus bar portion 112.
  • the second through hole 112h is provided in the second bus bar portion 113, and the third through hole 113h is provided at the other end in the longitudinal direction of the third bus bar portion 113.
  • the first bus bar portion 111 is inserted. And the input wiring 170 are connected.
  • the second bus bar portion 112 is inserted. And the input wiring 170 are connected.
  • the bolt 190 is inserted into the annular portion of the output terminal of the output wiring 171 and the third through hole 113h, and the bolt 190 and the nut 180 are fastened, whereby the third bus bar portion 113 and the output wiring 171 are connected. Connected.
  • the current input to the first bus bar portion 111 is output from the third bus bar portion 113 through the first connecting portion 114.
  • the current input to the second bus bar portion 112 is output from the third bus bar portion 113 through the first connecting portion 114.
  • connection method between the bus bar 110 and the external wiring is not limited to the above.
  • the direction in which current flows in the first bus bar portion 111, the direction in which current flows in the second bus bar portion 112, and the direction in which current flows in the third bus bar portion 113. are connected so as to be opposite.
  • the first bus bar portion 111 and the second bus bar portion 112 may be connected to the output wiring, and the third bus bar portion 113 may be connected to the input wiring.
  • the first magnetic sensor 120 is located between the first bus bar portion 111 and the third bus bar portion 113.
  • the second magnetic sensor 121 is located between the second bus bar part 112 and the third bus bar part 113.
  • the first magnetic sensor 120 is orthogonal to the direction in which the first bus bar portion 111, the second bus bar portion 112, and the third bus bar portion 113 are aligned, and is orthogonal to the extending direction of the third bus bar portion 113.
  • the detection axis is in the direction indicated by the arrow 120a in FIG.
  • the second magnetic sensor 121 is orthogonal to the direction in which the first bus bar part 111, the second bus bar part 112, and the third bus bar part 113 are aligned, and is orthogonal to the extending direction of the third bus bar part 113.
  • the detection axis is in the direction indicated by the arrow 121a in FIG.
  • the first magnetic sensor 120 and the second magnetic sensor 121 output a positive value when a magnetic field directed in one direction of the detection axis is detected, and a magnetic field directed in a direction opposite to the one direction of the detection axis. It has an odd function input / output characteristic that outputs a negative value when detected. That is, the phase of the detection value of the first magnetic sensor 120 and the phase of the detection value of the second magnetic sensor 121 are opposite to each other with respect to the strength of the magnetic field generated by the current to be measured flowing through the bus bar 110.
  • Examples of the first magnetic sensor 120 and the second magnetic sensor 121 include AMR (Anisotropic Magneto Resistance), GMR (Giant Magneto Resistance), TMR (Tunnel Magneto Resistance), BMR (Balistic Magneto Resistance), CMR (Colossal Magneto Resistance), and the like.
  • a magnetic sensor having a magnetoresistive element can be used.
  • a magnetic sensor using an AMR element having a barber pole structure having an odd function input / output characteristic and a Wheatstone bridge type bridge circuit or a half bridge circuit which is a half circuit configuration thereof can be used.
  • first magnetic sensor 120 and the second magnetic sensor 121 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. Can do.
  • the method is not limited to the method using the barber pole structure, and an induction magnetic field generated around the coil, a magnetic field of a permanent magnet, or a magnetic field combining these is used. May be biased.
  • the first magnetic sensor 120 is electrically connected to the subtractor 130 by the first connection wiring 141.
  • the second magnetic sensor 121 is electrically connected to the subtractor 130 by the second connection wiring 142.
  • the subtractor 130 subtracts the detection value of the second magnetic sensor 121 from the detection value of the first magnetic sensor 120, thereby calculating the value of the current to be measured flowing through the bus bar 110.
  • the subtractor 130 is used as the calculation means, but the calculation means is not limited to this and may be a differential amplifier or the like.
  • FIG. 3 is a diagram schematically showing a generated magnetic field in a cross-sectional view of the current sensor 100 according to the present embodiment as viewed from the direction of arrows III-III in FIG.
  • a rightward magnetic field in the figure is applied to the first magnetic sensor 120 in the direction of the detection axis indicated by the arrow 120a.
  • a leftward magnetic field in the figure is applied to the second magnetic sensor 121 in the direction of the detection axis indicated by the arrow 121a.
  • the detection value indicating the strength of the magnetic field detected by the first magnetic sensor 120 is a positive value
  • the detection value indicating the strength of the magnetic field detected by the second magnetic sensor 121 is a negative value.
  • the detection value of the first magnetic sensor 120 and the detection value of the second magnetic sensor 121 are transmitted to the subtractor 130.
  • the subtracter 130 subtracts the detection value of the second magnetic sensor 121 from the detection value of the first magnetic sensor 120. As a result, the absolute value of the detection value of the first magnetic sensor 120 and the absolute value of the detection value of the second magnetic sensor 121 are added. From this addition result, the value of the current to be measured flowing through the bus bar 110 is calculated.
  • the external magnetic field source is physically the first magnetic sensor. It cannot be positioned between the sensor 120 and the second magnetic sensor 121.
  • the direction of the magnetic field component in the direction of the detection axis indicated by the arrow 120a and the magnetic field applied from the external magnetic field source to the second magnetic sensor 121 is the same direction. Therefore, if the detection value indicating the strength of the external magnetic field detected by the first magnetic sensor 120 is a positive value, the detection value indicating the strength of the external magnetic field detected by the second magnetic sensor 121 is also a positive value.
  • the subtractor 130 subtracts the detection value of the second magnetic sensor 121 from the detection value of the first magnetic sensor 120, thereby detecting the absolute value of the detection value of the first magnetic sensor 120 and the detection of the second magnetic sensor 121.
  • 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 detection axis directions in which the detection values are positive may be opposite to each other (opposite 180 °). In this case, if the detection value indicating the strength of the external magnetic field detected by the first magnetic sensor 120 is a positive value, the detection value indicating the strength of the external magnetic field detected by the second magnetic sensor 121 is a negative value. .
  • the phase of the detection value of the first magnetic sensor 120 and the phase of the detection value of the second magnetic sensor 121 are in phase.
  • an adder is used in place of the subtractor 130 as the calculation means.
  • the adder adds the detection value of the first magnetic sensor 120 and the detection value of the second magnetic sensor 121, so that the absolute value of the detection value of the first magnetic sensor 120 and the second magnetic sensor 121 The absolute value of the detected 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 adder adds the detection value of the first magnetic sensor 120 and the detection value of the second magnetic sensor 121, thereby The absolute value of the detection value and the absolute value of the detection value of the second magnetic sensor 121 are added. From this addition result, the value of the current to be measured flowing through the bus bar 110 is calculated.
  • an adder may be used as the calculation unit in place of the subtractor 130 while the input / output characteristics of the first magnetic sensor 120 and the second magnetic sensor 121 have opposite polarities.
  • the first bus bar portion 111 and the second bus bar portion 112 are located in point symmetry with respect to the center point of the third bus bar portion 113 in the cross section.
  • the first bus bar portion 111 and the second bus bar portion 112 are symmetrical with respect to each other about the center line of the third bus bar portion 113 in the direction of the detection axis of the first magnetic sensor 120 and the second magnetic sensor 121 in the cross section. positioned.
  • first magnetic sensor 120 and the second magnetic sensor 121 are located point-symmetrically with respect to the center point of the third bus bar portion 113 in the cross section.
  • the first magnetic sensor 120 and the second magnetic sensor 121 are symmetrical with respect to each other about the center line of the third bus bar portion 113 in the direction of the detection axis of the first magnetic sensor 120 and the second magnetic sensor 121 in the cross section. positioned.
  • FIG. 4 is a cross-sectional view showing a state in which the first bus bar portion and the second bus bar portion are arranged in point symmetry with each other, and the first magnetic sensor and the second magnetic sensor are arranged in point symmetry with respect to each other. 4 shows the same cross-sectional view as FIG.
  • the first bus bar portion 111 and the second bus bar portion 112 are located in point symmetry with respect to the center point 113 c of the third bus bar portion 113 in the cross section. Further, the first magnetic sensor 120y and the second magnetic sensor 121y are located point-symmetrically with respect to the center point 113c of the third bus bar portion 113 in the cross section.
  • the magnetic field 113e generated by the current to be measured flowing through the bus bar 110 and circulating around the third bus bar portion 113 is equivalently applied in the opposite direction to each of the first magnetic sensor 120y and the second magnetic sensor 121y. Is done.
  • the subtractor 130 subtracts the detection value of the second magnetic sensor 121y from the detection value of the first magnetic sensor 120y, thereby doubling the detection value of the magnetic field 113e.
  • the subtractor 130 subtracts the detection value of the second magnetic sensor 121y from the detection value of the first magnetic sensor 120y, so that the detection value of the external magnetic field becomes zero.
  • the first magnetic sensor 120y and the second magnetic sensor 121y arranged in a point-symmetric manner in this way show detection values that equally reflect the magnetic field generated by the current to be measured flowing through the bus bar 110. Therefore, the linearity between the strength of the magnetic field generated by the current to be measured flowing through the bus bar 110 and the value of the current to be measured flowing through the bus bar 110 can be improved.
  • FIG. 5 is a cross-sectional view showing a state in which the first bus bar portion and the second bus bar portion are arranged in line symmetry with each other, and the first magnetic sensor and the second magnetic sensor are arranged in line symmetry with each other.
  • FIG. 5 shows the same cross-sectional view as FIG.
  • the first bus bar portion 111 and the second bus bar portion 112 are cross-sectionally shown with a center line 113x of the third bus bar portion 113 in the direction of the detection axis of the first magnetic sensor 120 and the second magnetic sensor 121. They are located symmetrically with each other as the center.
  • the first magnetic sensor 120z and the second magnetic sensor 121z are symmetrical with respect to each other about the center line 113x of the third bus bar portion 113 in the direction of the detection axis of the first magnetic sensor 120z and the second magnetic sensor 121z in the cross section. Is located.
  • the magnetic field 113e generated by the current to be measured flowing through the bus bar 110 and circulating around the third bus bar portion 113 is equivalently applied in the opposite direction to each of the first magnetic sensor 120z and the second magnetic sensor 121z. Is done.
  • the subtractor 130 subtracts the detection value of the second magnetic sensor 121z from the detection value of the first magnetic sensor 120z, the detection value of the magnetic field 113e is doubled.
  • the subtractor 130 subtracts the detection value of the second magnetic sensor 121z from the detection value of the first magnetic sensor 120z, so that the detection value of the external magnetic field becomes zero.
  • the external magnetic field source 10 when the external magnetic field source 10 is in the vicinity of the first magnetic sensor 120z and the second magnetic sensor 121z, the external magnetic field source 10 and the first magnetic sensor in the direction of the detection axis of the first magnetic sensor 120z indicated by the arrow 120a.
  • the distance L 1 from 120z is equal to the distance L 2 between the external magnetic field source 10 and the second magnetic sensor 121z in the direction of the detection axis of the second magnetic sensor 121z indicated by the arrow 121a.
  • the subtractor 130 subtracts the detection value of the second magnetic sensor 121z from the detection value of the first magnetic sensor 120z, so that the detection value of the external magnetic field becomes zero.
  • the distance L 4 between the external magnetic field source 10 and the second magnetic sensor 121z in the direction orthogonal to the direction of the detection axis is different, the magnetic field component in this direction is detected by the first magnetic sensor 120z and the second magnetic sensor 121z.
  • the first magnetic sensor 120z and the second magnetic sensor 121z arranged in line symmetry in this way indicate detection values that equally reflect the magnetic field generated by the current to be measured flowing through the bus bar 110. Therefore, the linearity between the strength of the magnetic field generated by the current to be measured flowing through the bus bar 110 and the value of the current to be measured flowing through the bus bar 110 can be improved. Furthermore, even when the external magnetic field source 10 is located in the vicinity of the first magnetic sensor 120z and the second magnetic sensor 121z, the influence of the external magnetic field can be reduced.
  • the current sensor 100 Since the current sensor 100 according to the present embodiment satisfies both the point-symmetrical arrangement and the line-symmetrical arrangement, the magnetic field generated by the current to be measured flowing through the bus bar 110 regardless of the position of the external magnetic field source 10. The influence of the external magnetic field can be reduced while increasing the linearity between the strength and the value of the current to be measured flowing through the bus bar 110 calculated from the strength.
  • the magnetic field generated between the first bus bar portion 111 and the third bus bar portion 113 has a relatively small change due to the distance from each bus bar portion. Therefore, high accuracy is not required for the arrangement of the first magnetic sensor 120.
  • the magnetic field generated between the second bus bar portion 112 and the third bus bar portion 113 has a relatively small change depending on the distance from each bus bar portion. Therefore, high accuracy is not required for the arrangement of the second magnetic sensor 121. Therefore, the current sensor 100 can be easily manufactured.
  • FIG. 6 is a perspective view showing the structure of the bus bar of the current sensor according to the modification of the present embodiment.
  • the bus bar 110a of the current sensor according to the modified example has an annular shape when seen in a plan view because both ends of the first bus bar portion 111 and both ends of the second bus bar portion 112 are connected to each other. have.
  • the other end in the longitudinal direction of the first bus bar portion 111 and the other end in the longitudinal direction of the second bus bar portion 112 are connected to each other by the second connecting portion 115.
  • the second connecting portion 115 extends in the direction in which the first bus bar portion 111, the second bus bar portion 112, and the third bus bar portion 113 are arranged. That is, the second connecting part 115 is orthogonal to the first bus bar part 111 and the second bus bar part 112.
  • the second connecting portion 115 has a rectangular parallelepiped shape.
  • the shape of the 2nd connection part 115 is not restricted to a rectangular parallelepiped shape, For example, a cylindrical shape may be sufficient.
  • the first female screw 115h is provided at the center in the extending direction of the second connecting portion 115, and the second female screw is provided at the other end in the longitudinal direction of the third bus bar portion 113. 113h 'is provided.
  • the second connecting portion 115 and the input wiring are connected by inserting a bolt into the input terminal of the input wiring and fastening the bolt with the first female screw 115h.
  • the third bus bar portion 113 and the output wiring are connected by inserting a bolt into the output terminal of the output wiring and fastening the bolt with the second female screw 113h '.
  • the current input to the second connecting portion 115 is output from the third bus bar portion 113 through the first bus bar portion 111, the second bus bar portion 112, and the first connecting portion 114.
  • the second connecting portion 115 a portion where the current flows through the portion located on the first bus bar portion 111 side from the third bus bar portion 113 and a portion located on the second bus bar portion 112 side from the third bus bar portion 113. This is opposite to the direction 17 in which the current flows.
  • connection method between the bus bar 110a and the external wiring is not limited to the above, and the direction in which current flows in the first bus bar portion 111, the direction in which current flows in the second bus bar portion 112, and the direction in which current flows in the third bus bar portion 113. Are connected so as to be opposite.
  • the 2nd connection part 115 may be connected to the output wiring, and the 3rd bus-bar part 113 may be connected to the input wiring.
  • the mechanical strength of the bus bar 110a can be made higher than that of the bus bar 110 according to the first embodiment. Further, by eliminating the need for nuts while reducing the number of connection points with external wiring, it is possible to easily connect with external wiring as compared with the bus bar 110 according to the first embodiment.
  • Embodiment 2 of the present invention will be described with reference to the drawings. Since the current sensor 200 according to the present embodiment is different from the current sensor 100 according to the first embodiment only in that the width of the bus bar is widened, the description of other configurations will not be repeated.
  • FIG. 7 is a perspective view showing a configuration of a current sensor according to Embodiment 2 of the present invention.
  • the current sensor 200 according to the second embodiment of the present invention includes a bus bar 210 through which a current to be measured flows.
  • the current sensor 200 includes a first magnetic sensor 220 and a second magnetic sensor 221 that detect the strength of a magnetic field generated by the current to be measured flowing through the bus bar 210 with an odd function input / output characteristic.
  • the current sensor 200 includes a subtracter 230 that is a calculation unit that calculates the value of the current by subtracting the detection values of the first magnetic sensor 220 and the second magnetic sensor 221.
  • the bus bar 210 includes a first bus bar portion 211 and a second bus bar portion 212 that are electrically connected in parallel to each other and located in parallel with an interval therebetween.
  • the bus bar 210 has a third bus bar portion that extends in parallel to the first bus bar portion 211 and the second bus bar portion 212 at an interval between the first bus bar portion 211 and the second bus bar portion 212. 213 is further included.
  • the gap G 1 between the first bus bar part 211 and the third bus bar part 213 is equal to the gap G 2 between the second bus bar part 212 and the third bus bar part 213.
  • the first bus bar portion 211, the second bus bar portion 212, and the third bus bar portion 213 have a rectangular parallelepiped shape and are arranged at equal intervals. One end in the longitudinal direction of the first bus bar portion 211, one end in the longitudinal direction of the second bus bar portion 212, and one end in the longitudinal direction of the third bus bar portion 213 are connected to each other by the first connecting portion 214.
  • the first connecting portion 214 has a rectangular parallelepiped shape, and extends in the direction in which the first bus bar portion 211, the second bus bar portion 212, and the third bus bar portion 213 are arranged. That is, the 1st connection part 214 is orthogonally crossed with the 1st bus-bar part 211, the 2nd bus-bar part 212, and the 3rd bus-bar part 213, respectively. As described above, the bus bar 210 has an E shape when seen in a plan view.
  • the first magnetic sensor 220 is located between the first bus bar part 211 and the third bus bar part 213.
  • the main surface of the first magnetic sensor 220 faces the first bus bar part 211 and the third bus bar part 213.
  • the second magnetic sensor 221 is located between the second bus bar part 212 and the third bus bar part 213.
  • the main surface of the second magnetic sensor 221 faces the second bus bar part 212 and the third bus bar part 213.
  • the first magnetic sensor 220 is orthogonal to the direction in which the first bus bar portion 211, the second bus bar portion 212, and the third bus bar portion 213 are aligned, and is orthogonal to the extending direction of the third bus bar portion 213.
  • the detection axis is in the direction indicated by the arrow 220a in FIG.
  • the second magnetic sensor 221 is orthogonal to the direction in which the first bus bar portion 211, the second bus bar portion 212, and the third bus bar portion 213 are aligned, and is orthogonal to the extending direction of the third bus bar portion 213.
  • the detection axis is in the direction indicated by the arrow 221a in FIG.
  • the first magnetic sensor 220 and the second magnetic sensor 221 output a positive value when a magnetic field directed in one direction of the detection axis is detected, and a magnetic field directed in a direction opposite to the one direction of the detection axis. It has an odd function input / output characteristic that outputs a negative value when detected.
  • the first magnetic sensor 220 is electrically connected to the subtracter 230 by connection wiring.
  • the second magnetic sensor 221 is electrically connected to the subtracter 230 by connection wiring.
  • the subtracter 230 calculates the value of the current to be measured flowing through the bus bar 210 by subtracting the detection value of the second magnetic sensor 221 from the detection value of the first magnetic sensor 220.
  • the width dimension 211t of the first bus bar portion 211, the width dimension 212t of the second bus bar portion 212, and The width dimension 213t of the third bus bar portion 213 is 1.5 times the distance dimensions G 1 and G 2 between the adjacent bus bar portions.
  • the dimension of the width of the first bus bar portion 211 211t, dimensions 212t of the width of the second bus bar 212, and the dimensions 213t of the width of the third bus bar portions 213 are each 1.5G 1.
  • the size of the width of the first bus bar portion 211 211t, dimensions 212t of the width of the second bus bar 212, and the dimensions 213t of the width of the third bus bar 213 is respectively 1.5G 1 or more It is more preferable that each is 2.0 G 1 or more.
  • the direction 21 in which the current flows through the first bus bar portion 211 and the direction 22 in which the current flows through the second bus bar portion 212 are the same.
  • the direction 21 in which current flows in the first bus bar portion 211, the direction 22 in which current flows in the second bus bar portion 212, and the direction 23 in which current flows in the third bus bar portion 213 are opposite to each other.
  • the bus bar 210 is connected to external wiring including input wiring and output wiring, as in the current sensor 100 according to the first embodiment shown in FIG. For this reason, the current input to the first bus bar portion 211 is output from the third bus bar portion 213 through the first connection portion 214. In addition, the current input to the second bus bar portion 212 is output from the third bus bar portion 213 through the first connecting portion 214.
  • the portion 24 that is located on the first bus bar portion 211 side from the third bus bar portion 213 and the portion 24 that is located on the second bus bar portion 212 side from the third bus bar portion 213 are disposed. This is opposite to the direction 25 in which the current flows.
  • FIG. 8 is a diagram schematically showing a generated magnetic field in a cross-sectional view of the current sensor 200 according to the present embodiment as viewed from the direction of arrows VIII-VIII in FIG.
  • a rightward magnetic field in the drawing is applied to the first magnetic sensor 220 in the direction of the detection axis indicated by the arrow 220a.
  • a leftward magnetic field in the figure is applied to the second magnetic sensor 221 in the direction of the detection axis indicated by the arrow 221a.
  • the detection value indicating the strength of the magnetic field detected by the first magnetic sensor 220 is a positive value
  • the detection value indicating the strength of the magnetic field detected by the second magnetic sensor 221 is a negative value.
  • the detection value of the first magnetic sensor 220 and the detection value of the second magnetic sensor 221 are transmitted to the subtracter 230.
  • the subtracter 230 subtracts the detection value of the second magnetic sensor 221 from the detection value of the first magnetic sensor 220. As a result, the absolute value of the detection value of the first magnetic sensor 220 and the absolute value of the detection value of the second magnetic sensor 221 are added. From this addition result, the value of the current to be measured flowing through the bus bar 210 is calculated.
  • FIG. 9 is a magnetic flux diagram showing the result of simulating the magnetic flux density of the magnetic field generated by the current to be measured flowing through the bus bar 210 around the bus bar 210 of the current sensor 200 according to the present embodiment.
  • FIG. 10 is a contour map showing the result of simulating the magnetic flux density of the magnetic field generated by the current to be measured flowing through the bus bar 210 around the bus bar 210 of the current sensor 200 according to the present embodiment. 9 and 10 show the same cross section as FIG.
  • a current sensor according to a comparative example is prepared.
  • the current sensor according to the comparative example includes a bus bar 910 through which a current to be measured flows.
  • FIG. 11 is a plan view showing the shape of the bus bar 910 included in the current sensor according to the comparative example.
  • FIG. 12 shows the result of simulating the magnetic flux density of the magnetic field generated by the current to be measured flowing through the bus bar 910 in the vicinity of the bus bar 910 of the current sensor according to the comparative example, as viewed from the direction of the arrow XII-XII in FIG. It is the contour map shown in the cross section.
  • the bus bar 910 included in the current sensor according to the comparative example includes a first bus bar portion 911 and a second bus bar portion 912 that are positioned in parallel with a space between each other.
  • the bus bar 910 one end of the first bus bar part 911 and one end of the second bus bar part 912 are connected by a connecting part 913.
  • the bus bar 910 is formed in a thin plate shape. The current flows from the first bus bar part 911 to the second bus bar part 912 through the connecting part 913.
  • FIG. 13 is a graph showing the relationship between the distance away from the central portion of the third bus bar portion 213 in the left-right direction in FIG. 10 in the up-down direction in FIG. 10 and the magnetic flux density in the current sensor 200 according to the present embodiment. It is.
  • the vertical axis represents the magnetic flux density (mT)
  • the horizontal axis represents the distance (mm) from the surface of the third bus bar portion 213.
  • FIG. 14 shows a distance between the center portion of the first bus bar portion 911 or the center portion of the second bus bar portion 912 in the left-right direction in FIG. 12 and the magnetic flux in the up-down direction in FIG. It is a graph which shows the relationship with a density.
  • the vertical axis represents the magnetic flux density (mT)
  • the horizontal axis represents the distance (mm) from the surface of the bus bar 910.
  • each bus bar portion in this embodiment and the comparative example was 2 mm ⁇ 10 mm, and the value of the current to be measured flowing through the bus bar was 100 A.
  • the value of the current to be measured flowing through the third bus bar portion 213 is 100A.
  • a line with a magnetic flux density of 0.6 mT is E 1
  • a line with 1.2 mT is E 2
  • a line with 1.8 mT is E 3
  • a line with 2.4 mT is E 4.
  • a line of 3.0 mT is E 5
  • a line of 3.6 mT is E 6
  • a line of 4.2 mT is E 7
  • a line of 4.8 mT is E 8
  • a line of 5.4 mT is E 9
  • a line that is 6.0 mT is indicated by E 10 .
  • the width dimension 211t of the first bus bar portion 211, the width dimension 212t of the second bus bar portion 212, and the width dimension 213t of the third bus bar portion 213 are adjacent to each other. 1.5 times the dimension G 1, G 2 of the spacing between the bus bar unit to.
  • the magnetic flux lines of the magnetic field to be extended extend substantially linearly along each bus bar portion in the left-right direction in the figure.
  • the horizontal direction in the figure is the direction of the detection axis of the first and second magnetic sensors 220 and 221.
  • the magnetic flux density is higher than 4.8 mT in the vicinity of the third bus bar portion 213 between the first bus bar portion 211 and the third bus bar portion 213. A region is formed.
  • the magnetic flux density is about 4.5 mT and hardly changes at the center portion in the left-right direction in the drawing on the first bus bar portion 211 side. Is formed.
  • a region having a magnetic flux density higher than 4.8 mT is formed in the vicinity of the third bus bar portion 213 between the second bus bar portion 212 and the third bus bar portion 213.
  • the magnetic flux density between the first bus bar portion 911 and the second bus bar portion 912 increases as the distance from the vicinity of the first bus bar portion 911 and the vicinity of the second bus bar portion 912 increases. Is rapidly decreasing, and there is no region where the magnetic flux density hardly changes.
  • the magnetic flux density rapidly decreases as the distance from the central portion of the first bus bar portion 911 or the central portion of the second bus bar portion 912 in the vertical direction in FIG. ing.
  • the first magnetic sensor 220 is disposed closer to the third bus bar portion 213 than the first bus bar portion 211, and the second magnetic sensor 221 is disposed from the second bus bar portion 212 to the third bus bar. Since the first magnetic sensor 220 and the second magnetic sensor 221 can be disposed in a region having a high magnetic flux density by being disposed near the portion 213, the SN ratio (signal-noise ratio) of the current sensor 200 can be increased. . In this case, the sensitivity of the current sensor 200 can be improved.
  • the first magnetic sensor 220 is disposed closer to the first bus bar portion 211 than the third bus bar portion 213, and the second magnetic sensor 221 is disposed from the third bus bar portion 213 to the second bus bar. Since the first magnetic sensor 220 and the second magnetic sensor 221 can be arranged in a region where the magnetic flux density hardly changes by being arranged near the portion 212, the arrangement of the first magnetic sensor 220 and the second magnetic sensor 221 can be reduced. High accuracy is not required. In this case, the current sensor 200 can be easily manufactured.
  • width dimension 211t of the first bus bar portion 211, the width dimension 212t of the second bus bar portion 212, and the width dimension 213t of the third bus bar portion 213 are each 1.5 G 1 or more. It becomes remarkable when it is obtained stably and each is 2.0 G 1 or more.
  • the influence of the external magnetic field can be reduced. Moreover, since high precision is not required for the arrangement of the first magnetic sensor 220 and the second magnetic sensor 121, the current sensor 200 can be easily manufactured.
  • the bus bar 210 according to the present embodiment has an area where the magnetic flux density is lower than 0.6 mT, which is formed near the bus bar, as compared with the bus bar 910 of the comparative example. That is, the leakage magnetic field of the bus bar 210 according to the present embodiment is smaller than the leakage magnetic field of the bus bar 910 of the comparative example.
  • the current flowing through each path is obtained by using the current sensor 200 according to the present embodiment. Can be detected more accurately.
  • FIG. 15 is a perspective view showing a configuration of a current sensor according to Embodiment 3 of the present invention.
  • the current sensor 300 according to the third embodiment of the present invention includes a bus bar 310 through which a current to be measured flows.
  • the current sensor 300 includes a first magnetic sensor 320 and a second magnetic sensor 321 that detect the strength of the magnetic field generated by the current to be measured flowing through the bus bar 310 with an odd function input / output characteristic.
  • the current sensor 300 includes a subtracter (not shown) which is a calculation means for calculating the current value by subtracting the detection values of the first magnetic sensor 320 and the second magnetic sensor 321.
  • the bus bar 310 constitutes a first bus bar member 310a constituting the first bus bar part 311 and a part 313a of the third bus bar part, and a second bus bar part 312 and a part 313b of the third bus bar part. Second bus bar member 310b.
  • first bus bar member 310a and the second bus bar member 310b have the same U-shape when viewed in plan.
  • first bus bar member 310a one end in the longitudinal direction of the first bus bar part 311 and one end in the longitudinal direction of the part 313a of the third bus bar part, which are parallel to each other with a space therebetween, are curved. They are connected to each other by one connecting portion 314a.
  • the first end in the longitudinal direction of the second bus bar portion 312 and the one end in the longitudinal direction of the portion 313b of the third bus bar portion, which are parallel to each other with a space therebetween, are curved. They are connected to each other by one connecting portion 314b.
  • the third bus bar portion 313 includes a third bus bar portion 313a of the first bus bar member 310a and a third bus bar portion 313b of the second bus bar member 310b.
  • the first through-hole 311h at the other end in the longitudinal direction of the first bus bar portion 311, the second through-hole 312h at the other end in the longitudinal direction of the second bus bar portion 312 and the other end in the longitudinal direction of the third bus bar portion 313 A third through hole 313h is provided.
  • the first through hole 311h and the second through hole 312h are provided for connecting the input wiring, and the third through hole 313h is provided for connecting the output wiring.
  • the first through hole 311h and the second through hole 312h may be used for connecting the output wiring, and the third through hole 313h may be used for connecting the input wiring.
  • the first bus bar member 310a and the second bus bar member 310b are joined, and are in contact with each other in a part of each third bus bar portion 313. Specifically, the surface of the third bus bar portion 313a opposite to the first bus bar member 310a side and the surface of the third bus bar portion 313b opposite to the second bus bar member 310b side Are in contact with each other.
  • the first bus bar member 310a and the second bus bar member 310b are joined by welding.
  • the joining method of both members is not limited to welding, and joining is performed by brazing, soldering, fastening using bolts and nuts, fastening using rivets, fitting of both members, or caulking of both members. Also good.
  • the bus bar 310 may be insert-molded using an insulating resin. In this case, only the periphery of the first through hole 311h, the second through hole 312h, and the third through hole 313h is exposed, and the other part of the bus bar 310 is molded with an insulating resin.
  • the bonding strength between the first bus bar member 310a and the second bus bar member 310b can be improved, and the portions other than the connection portion of the bus bar 310 with the external wiring can be insulated and sealed.
  • the third bus bar portion 313 of the bus bar 310 according to the present embodiment includes a third bus bar portion 313a of the first bus bar member 310a and a third bus bar portion 313b of the second bus bar member 310b. Therefore, the dimensions of the first bus bar part 311 and the second bus bar part 312 of the bus bar 310 according to the present embodiment are made equal to the dimensions of the first bus bar part 211 and the second bus bar part 212 of the bus bar 210 according to the second embodiment.
  • the third bus bar portion 313 of the bus bar 310 according to the present embodiment has a cross-sectional area twice that of the third bus bar portion 213 of the bus bar 210 according to the second embodiment. Therefore, the electrical resistance in the third bus bar portion 313 is halved, and the allowable current of the bus bar 310 can be increased.
  • the influence of the external magnetic field can be reduced. Further, since high accuracy is not required for the arrangement of the first magnetic sensor 320 and the second magnetic sensor 321, the current sensor 300 can be easily manufactured.
  • the first bus bar member 310a and the second bus bar member 310b do not necessarily have the same shape, but by using the same shape, the types of members to be prepared can be reduced and the first magnetic sensor 320 can be reduced.
  • the second magnetic sensor 321 can be arranged symmetrically with respect to the bus bar 310 to ensure the detection stability of the current sensor 300.
  • the current sensor 400 according to the present embodiment is different from the current sensor 300 according to the third embodiment only in that the input terminal portion and the output terminal portion are drawn in opposite directions, and therefore, description of other configurations will not be repeated. .
  • FIG. 16 is a perspective view showing a configuration of a current sensor according to Embodiment 4 of the present invention.
  • the current sensor 400 according to the fourth embodiment of the present invention includes a bus bar 410 through which a current to be measured flows.
  • the current sensor 400 also includes a first magnetic sensor 420 and a second magnetic sensor 421 that detect the strength of the magnetic field generated by the current to be measured flowing through the bus bar 410 with an odd function input / output characteristic.
  • the current sensor 400 includes a subtracter (not shown) that is a calculation unit that calculates the value of the current by subtracting the detection values of the first magnetic sensor 420 and the second magnetic sensor 421.
  • the bus bar 410 constitutes a first bus bar member 410a constituting a first bus bar part 411 and a part 413a of a third bus bar part, and a second bus bar part 412 and a part 413b of a third bus bar part. Second bus bar member 410b.
  • the bus bar 410 has an input terminal part 416 for inputting current to the first bus bar part 411 and the second bus bar part 412 and an output terminal part 417 for outputting current from the third bus bar part 413.
  • first bus bar member 410a one end of the first bus bar part 411 and one end of the part 413a of the third bus bar part which are positioned in parallel with a space between each other are mutually connected by the curved first connecting part 414a. It is connected.
  • the third bus bar part 413 of the bus bar 410 is composed of a part 413a of the third bus bar part in the first bus bar member 410a and a part 413b of the third bus bar part in the second bus bar member 410b.
  • the input terminal part 416 of the bus bar 410 includes a part 416a of the input terminal part in the first bus bar member 410a and a part 416b of the input terminal part in the second bus bar member 410b.
  • the output terminal part 417 of the bus bar 410 includes a part 417a of the output terminal part in the first bus bar member 410a and a part 417b of the output terminal part in the second bus bar member 410b.
  • the input terminal portion 416 and the output terminal portion 417 are located on the same plane and extend in opposite directions in the direction of the detection axis of the first magnetic sensor 420 and the second magnetic sensor 421.
  • the left-right direction in FIG. 16 is the direction of the detection axis of the first magnetic sensor 420 and the second magnetic sensor 421.
  • the other end of the first bus bar portion 411 and one end of the input terminal portion 416a are connected to each other by a curved second connecting portion 415a.
  • the part 416a of the input terminal portion extends in the left direction in FIG. 16 from the second connecting portion 415a.
  • a part 417a of the output terminal portion extends in the right direction in FIG. 16 from the other end of the part 413a of the third bus bar portion.
  • the input terminal portion 416a and the output terminal portion 417a are located on the same plane.
  • the other end of the second bus bar portion 412 and one end of the input terminal portion 416b are connected to each other by a curved second connecting portion 415b.
  • the part 416b of the input terminal portion extends in the left direction in FIG. 16 from the second connecting portion 415b.
  • a portion 417b of the output terminal portion extends in the right direction in FIG. 16 from the other end of the portion 413b of the third bus bar portion.
  • the input terminal portion 416b and the output terminal portion 417b are located on the same plane.
  • a first through hole 416h is provided at the other end of the input terminal portion 416, and a second through hole 417h is provided at the other end of the output terminal portion 417.
  • the first through hole 416h is a hole for connecting the input wiring
  • the second through hole 417h is a hole for connecting the output wiring.
  • the first through hole 416h may be used for connecting the output wiring
  • the second through hole 417h may be used for connecting the input wiring.
  • the first bus bar member 410a and the second bus bar member 410b are in contact with each other in each third bus bar portion 413.
  • the first bus bar member 410a and the second bus bar member 410b are in contact with each other at the input terminal portion 416 and the output terminal portion 417 as well.
  • the influence of the external magnetic field can be reduced. Moreover, since high precision is not required for the arrangement of the first magnetic sensor 420 and the second magnetic sensor 421, the current sensor 400 can be easily manufactured.
  • FIG. 17 is a perspective view showing a configuration of a current sensor according to Embodiment 5 of the present invention.
  • the current sensor 200x according to the fifth embodiment of the present invention includes a bus bar 210 through which a current to be measured flows.
  • the current sensor 200x includes a first magnetic sensor 220 and a second magnetic sensor 221 that detect the strength of the magnetic field generated by the current to be measured flowing through the bus bar 210 with an odd function input / output characteristic.
  • the current sensor 200x includes a subtracter 230 that is a calculation means for calculating the value of the current by subtracting the detection values of the first magnetic sensor 220 and the second magnetic sensor 221.
  • the first magnetic sensor 220 is located between the first bus bar part 211 and the third bus bar part 213.
  • the main surface of the first magnetic sensor 220 faces the first connecting portion 214.
  • the second magnetic sensor 221 is located between the second bus bar part 212 and the third bus bar part 213.
  • the main surface of the second magnetic sensor 221 faces the first connecting part 214.
  • the first magnetic sensor 220 is orthogonal to the direction in which the first bus bar portion 211, the second bus bar portion 212, and the third bus bar portion 213 are aligned, and is orthogonal to the extending direction of the third bus bar portion 213.
  • the detection axis is in the direction indicated by the arrow 220a in FIG.
  • the second magnetic sensor 221 is orthogonal to the direction in which the first bus bar portion 211, the second bus bar portion 212, and the third bus bar portion 213 are aligned, and is orthogonal to the extending direction of the third bus bar portion 213.
  • the detection axis is in the direction indicated by the arrow 221a in FIG.
  • FIG. 18 is a diagram schematically showing a generated magnetic field in a cross-sectional view of the current sensor 200x according to the present embodiment as viewed from the direction of the arrow XVIII-XVIII in FIG.
  • a rightward magnetic field in the drawing is applied to the first magnetic sensor 220 in the direction of the detection axis indicated by the arrow 220a.
  • a leftward magnetic field in the figure is applied to the second magnetic sensor 221 in the direction of the detection axis indicated by the arrow 221a.
  • the detection value indicating the strength of the magnetic field detected by the first magnetic sensor 220 is a positive value
  • the detection value indicating the strength of the magnetic field detected by the second magnetic sensor 221 is a negative value.
  • the detection value of the first magnetic sensor 220 and the detection value of the second magnetic sensor 221 are transmitted to the subtracter 230.
  • the subtracter 230 subtracts the detection value of the second magnetic sensor 221 from the detection value of the first magnetic sensor 220. As a result, the absolute value of the detection value of the first magnetic sensor 220 and the absolute value of the detection value of the second magnetic sensor 221 are added. From this addition result, the value of the current to be measured flowing through the bus bar 210 is calculated.
  • Magnetic sensors having magnetoresistive elements such as AMR, GMR, and TMR as the optimum magnetic sensor for detecting a magnetic field applied in a direction parallel to the main surface of the magnetic sensor as in the second and fifth embodiments, There are magnetic sensors having an MI element or flux gate type magnetic sensors.
  • FIG. 19 is a perspective view showing a configuration of a current sensor according to Embodiment 6 of the present invention.
  • a current sensor 200y according to Embodiment 6 of the present invention includes a bus bar 210 through which a current to be measured flows.
  • the current sensor 200y includes a first magnetic sensor 220y and a second magnetic sensor 221y that detect the strength of the magnetic field generated by the current to be measured flowing through the bus bar 210 with an odd function input / output characteristic.
  • the current sensor 200y includes a subtracter 230, which is a calculation means for calculating the current value by subtracting the detection values of the first magnetic sensor 220y and the second magnetic sensor 221y.
  • the first magnetic sensor 220y is located between the first bus bar portion 211 and the third bus bar portion 213.
  • a plane including the main surface of the first magnetic sensor 220y is orthogonal to each of the first bus bar portion 211, the third bus bar portion 213, and the first connecting portion 214.
  • the second magnetic sensor 221y is located between the second bus bar portion 212 and the third bus bar portion 213.
  • a plane including the main surface of the second magnetic sensor 221y is orthogonal to each of the second bus bar portion 212, the third bus bar portion 213, and the first connecting portion 214.
  • the first magnetic sensor 220y is orthogonal to the direction in which the first bus bar portion 211, the second bus bar portion 212, and the third bus bar portion 213 are aligned, and is orthogonal to the extending direction of the third bus bar portion 213.
  • the detection axis is in the direction indicated by the arrow 220ya in FIG.
  • the second magnetic sensor 221y is orthogonal to the direction in which the first bus bar portion 211, the second bus bar portion 212, and the third bus bar portion 213 are aligned, and is orthogonal to the extending direction of the third bus bar portion 213.
  • the detection axis is in the direction indicated by the arrow 221ya in FIG.
  • FIG. 20 is a diagram schematically showing a generated magnetic field in a cross-sectional view of the current sensor 200y according to the present embodiment as viewed from the direction of arrows XX-XX in FIG.
  • a rightward magnetic field in the figure is applied to the first magnetic sensor 220y in the direction of the detection axis indicated by the arrow 220ya.
  • a leftward magnetic field in the figure is applied to the second magnetic sensor 221y in the direction of the detection axis indicated by the arrow 221ya.
  • the detection value indicating the strength of the magnetic field detected by the first magnetic sensor 220y is a positive value
  • the detection value indicating the strength of the magnetic field detected by the second magnetic sensor 221y is a negative value.
  • the detection value of the first magnetic sensor 220y and the detection value of the second magnetic sensor 221y are transmitted to the subtracter 230.
  • the subtracter 230 subtracts the detection value of the second magnetic sensor 221y from the detection value of the first magnetic sensor 220y. As a result, the absolute value of the detection value of the first magnetic sensor 220y and the absolute value of the detection value of the second magnetic sensor 221y are added. From this addition result, the value of the current to be measured flowing through the bus bar 210 is calculated.
  • a magnetic sensor having a Hall element as an optimum magnetic sensor for detecting a magnetic field applied in a direction perpendicular to the main surface of the magnetic sensor.
  • the current sensor module according to Embodiment 7 of the present invention is configured in the same manner as the current sensor according to Embodiment 5 in the arrangement direction of the main surface of the magnetic sensor. Will be described with reference to FIG. In the description of the current sensor module 300x below, the description of the same configuration as the current sensor 300 will not be repeated.
  • FIG. 21 is a perspective view showing a configuration of a current sensor module according to Embodiment 7 of the present invention.
  • the current sensor module 300x according to the seventh embodiment of the present invention includes a current sensor, a mounting board 350, a subtractor 330, and an external connection terminal 360.
  • the current sensor, the subtractor 330, and the external connection terminal 360 are mounted on the mounting board 350.
  • the mounting substrate 350 is provided with a first opening 351, a second opening 352, and a third opening 353.
  • the first bus bar portion 311 is fitted in the first opening portion 351.
  • a third bus bar portion 313 is fitted in the second opening 352.
  • the second bus bar portion 312 is fitted in the third opening 353.
  • the first magnetic sensor 320 and the second magnetic sensor 321 are mounted on the mounting board 350.
  • the main surface of the first magnetic sensor 320 faces the first connecting portion 314a.
  • the main surface of the second magnetic sensor 321 faces the first connecting portion 314b.
  • the first magnetic sensor 320 is orthogonal to the direction in which the first bus bar portion 311, the second bus bar portion 312, and the third bus bar portion 313 are aligned, and orthogonal to the extending direction of the third bus bar portion 313.
  • the detection axis is in the direction indicated by the arrow 320a in FIG.
  • the second magnetic sensor 321 has a direction orthogonal to the direction in which the first bus bar portion 311, the second bus bar portion 312 and the third bus bar portion 313 are aligned, and is orthogonal to the extending direction of the third bus bar portion 313.
  • the detection axis is in the direction indicated by the arrow 321a in FIG.
  • the first magnetic sensor 320 is electrically connected to the subtractor 330 through the first connection wiring 341.
  • the second magnetic sensor 321 is electrically connected to the subtractor 330 through the second connection wiring 342.
  • the subtractor 330 calculates the value of the current to be measured flowing through the bus bar 310 by subtracting the detection value of the second magnetic sensor 321 from the detection value of the first magnetic sensor 320.
  • the calculation result of the subtracter 330 is output from the external connection terminal 360.
  • the current sensor module 300x is modularized by mounting each component on the mounting substrate 350, the current sensor module 300x can be easily manufactured while maintaining high positional accuracy between the components.
  • 10 external magnetic field source 100, 200, 200x, 200y, 300, 300x, 400 current sensor, 110, 110a, 210, 310, 410, 910 bus bar, 111, 211, 311, 411, 911, first bus bar part, 111h, 311h, 416h 1st through hole, 112, 212, 312, 412, 912 2nd bus bar part, 112h, 312h, 417h 2nd through hole, 113, 213, 313, 413 3rd bus bar part, 113c center point, 113h 1st 3 through hole, 113h 'second female thread, 113x center line, 114, 214, 314a, 314b, 414a, 414b first connecting part, 115, 415a, 415b second connecting part, 115h first female thread, 120, 120y, 120z , 220, 220y, 320, 4 0 1st magnetic sensor, 121, 121y, 121z, 221, 221y, 321, 421

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

Abstract

La présente invention comporte une barre omnibus (110) à travers laquelle un courant électrique à mesurer circule, et deux capteurs magnétiques (120, 121) pour détecter l'intensité d'un champ magnétique généré par le courant électrique circulant à travers la barre omnibus (110). La barre omnibus (110) comprend une première partie de barre omnibus (111) et une seconde partie de barre omnibus (112) connectées électriquement en parallèle l'une par rapport à l'autre et positionnées parallèle l'une à l'autre espacées d'un intervalle l'une par rapport à l'autre, et une troisième partie de barre omnibus (113) s'étendant parallèle à la première partie de barre omnibus (111) et à la seconde partie de barre omnibus (112) espacées d'un intervalle de chacune de celles-ci à mi-chemin entre la première partie de barre omnibus (111) et la seconde partie de barre omnibus (112).
PCT/JP2014/051497 2013-02-06 2014-01-24 Capteur de courant électrique WO2014123007A1 (fr)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016142961A (ja) * 2015-02-04 2016-08-08 日本精機株式会社 ヘッドアップディスプレイ装置
JP2017003575A (ja) * 2015-06-04 2017-01-05 株式会社村田製作所 電流センサ
US11204374B2 (en) * 2017-09-06 2021-12-21 Murata Manufacturing Co., Ltd. Current sensor, and manufacturing method for current sensor
WO2022030177A1 (fr) * 2020-08-06 2022-02-10 株式会社村田製作所 Capteur de courant électrique
WO2022118878A1 (fr) * 2020-12-02 2022-06-09 株式会社デンソー Capteur de courant électrique

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63500961A (ja) * 1985-09-14 1988-04-07 エルゲーツエット・ランディス・ウント・ギール・ツーク・アクチエンゲゼルシャフト 静的積算電気計器の変流装置
US5541503A (en) * 1994-11-21 1996-07-30 General Electric Company Alternating current sensor based on concentric-pipe geometry and having a transformer for providing separate self-powering
JP2007183221A (ja) * 2006-01-10 2007-07-19 Denso Corp 電流センサ

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0799900B2 (ja) * 1988-03-04 1995-10-25 三菱電機株式会社 母線装置
JP2002071728A (ja) * 2000-08-28 2002-03-12 Yazaki Corp 電流検出装置及び電流検出方法並びにこれらを用いた電源供給システム
JP4876794B2 (ja) * 2006-08-29 2012-02-15 株式会社豊田自動織機 電流測定装置および電流測定方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63500961A (ja) * 1985-09-14 1988-04-07 エルゲーツエット・ランディス・ウント・ギール・ツーク・アクチエンゲゼルシャフト 静的積算電気計器の変流装置
US5541503A (en) * 1994-11-21 1996-07-30 General Electric Company Alternating current sensor based on concentric-pipe geometry and having a transformer for providing separate self-powering
JP2007183221A (ja) * 2006-01-10 2007-07-19 Denso Corp 電流センサ

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016142961A (ja) * 2015-02-04 2016-08-08 日本精機株式会社 ヘッドアップディスプレイ装置
JP2017003575A (ja) * 2015-06-04 2017-01-05 株式会社村田製作所 電流センサ
CN107250813A (zh) * 2015-06-04 2017-10-13 株式会社村田制作所 电流传感器
CN107430155A (zh) * 2015-06-04 2017-12-01 株式会社村田制作所 电流传感器
US10215780B2 (en) 2015-06-04 2019-02-26 Murata Manufacturing Co., Ltd. Current sensor
US11204374B2 (en) * 2017-09-06 2021-12-21 Murata Manufacturing Co., Ltd. Current sensor, and manufacturing method for current sensor
WO2022030177A1 (fr) * 2020-08-06 2022-02-10 株式会社村田製作所 Capteur de courant électrique
WO2022118878A1 (fr) * 2020-12-02 2022-06-09 株式会社デンソー Capteur de courant électrique
JP7452398B2 (ja) 2020-12-02 2024-03-19 株式会社デンソー 電流センサ

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