WO2014192625A1 - Capteur de courant - Google Patents

Capteur de courant Download PDF

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Publication number
WO2014192625A1
WO2014192625A1 PCT/JP2014/063559 JP2014063559W WO2014192625A1 WO 2014192625 A1 WO2014192625 A1 WO 2014192625A1 JP 2014063559 W JP2014063559 W JP 2014063559W WO 2014192625 A1 WO2014192625 A1 WO 2014192625A1
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WO
WIPO (PCT)
Prior art keywords
bus bar
bar portion
magnetic sensor
current
parallel
Prior art date
Application number
PCT/JP2014/063559
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English (en)
Japanese (ja)
Inventor
川浪　崇
Original Assignee
株式会社村田製作所
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 株式会社村田製作所 filed Critical 株式会社村田製作所
Priority to JP2015519815A priority Critical patent/JPWO2014192625A1/ja
Publication of WO2014192625A1 publication Critical patent/WO2014192625A1/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 measures the value of a current to be measured by detecting 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.
  • Patent Document 3 Japanese Patent Application Laid-Open No. 2010-223722 is a prior art document that discloses a current detection device that has improved resistance to misalignment between a conductor and a magnetic sensor.
  • a pair of magnetic sensors are arranged with a bus bar between them. Further, when one of the pair of magnetic sensors approaches the bus bar, the other of the pair of magnetic sensors is in a state of separating from the bus bar.
  • Patent Document 4 JP-A-2007-218729 is a prior art document that discloses a current sensor with improved detection accuracy.
  • the current sensor described in Patent Document 4 is fitted in the fitting groove so that the bus bar formed with the fitting groove and the end of the lead frame connected to the hall element protrude while molding the hall element. And a fixed package.
  • 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 first to fourth bus bars. Therefore, it is necessary to accurately dispose the magnetic sensitive resistor at a desired position 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.
  • the positional relationship between the magnetic sensors is limited because the amount of increase in the output of one magnetic sensor matches the amount of decrease in the output of the other magnetic sensor. Therefore, it is necessary to accurately arrange the magnetic sensors so as to have a desired positional relationship with each other, and it is difficult to manufacture the current detection device.
  • 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 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 bar includes a first bus bar portion, a second bus bar portion, and a third bus bar portion that are electrically connected in series.
  • the first bus bar portion and the third bus bar portion extend in parallel with a space between each other, and are connected to each other by the second bus bar portion.
  • the direction in which the current flows through the first bus bar is the same as the direction in which the current flows through the third bus bar.
  • the first magnetic sensor is located between the first bus bar portion and the second bus bar portion.
  • the second magnetic sensor is located between the second bus bar portion and the third bus bar portion.
  • the first magnetic sensor has a detection axis in a direction orthogonal to the direction in which the first bus bar portion and the third bus bar portion are arranged and in a direction orthogonal to the extending direction of the first bus bar portion.
  • the second magnetic sensor has a detection axis in a direction orthogonal to the direction in which the first bus bar portion and the third bus bar portion are aligned and in a direction orthogonal to the extending direction of the third bus bar portion.
  • the second bus bar portion includes a parallel portion extending in parallel with an interval from each of the first bus bar portion and the third 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 third bus bar portion are opposite to the direction in which the current flows through the parallel portion of the second bus bar portion.
  • the first magnetic sensor is located between the first bus bar portion and the parallel portion of the second bus bar portion facing each other.
  • the second magnetic sensor is located between the parallel portion of the second bus bar portion and the third bus bar portion facing each other.
  • Each of the first magnetic sensor and the second magnetic sensor includes a direction orthogonal to a direction in which the parallel portion of the first bus bar portion, the second bus bar portion, and the third bus bar portion are arranged, and a parallel portion of the second bus bar portion.
  • the detection axis is in a direction orthogonal to the extending direction of the.
  • the width of each of the first bus bar portion, the second bus bar portion, and the third bus bar portion is parallel between the adjacent bus bar portions. It is at least 1.5 times the dimension of the interval.
  • the distance between the first bus bar portion and the parallel portion of the second bus bar portion, and between the parallel portion of the second bus bar portion and the third bus bar portion is equal.
  • the length dimension in the extending direction of the parallel portion of the second bus bar portion is equal to or greater than the width dimension of the second bus bar portion.
  • the first bus bar portion and the third bus bar portion are located symmetrically with respect to each other about the center point of the parallel portion of the second bus bar portion in the cross section.
  • the first magnetic sensor and the second magnetic sensor are located symmetrically with respect to each other about the center point of the parallel portion of the second bus bar portion in the cross section.
  • the first bus bar portion and the third bus bar portion are positioned symmetrically with respect to each other about the center line of the parallel portion of the second bus bar portion in the direction of the detection axis in the cross section.
  • the first magnetic sensor and the second magnetic sensor are positioned symmetrically with respect to each other about the center line of the parallel portion of the second bus bar portion in the direction of the detection axis.
  • the second bus bar portion includes a first connecting portion that connects the other end of the first bus bar portion and one end of the parallel portion of the second bus bar portion, and a parallel portion of the second bus bar portion.
  • a second connecting portion connecting the end and one end of the third bus bar portion.
  • the first connecting portion of the second bus bar portion extends linearly in a side view and is orthogonal to each of the parallel portions of the first bus bar portion and the second bus bar portion.
  • the second connecting portion of the second bus bar portion extends linearly in a side view and is orthogonal to each of the parallel portion of the second bus bar portion and the third bus bar portion.
  • the second bus bar portion includes a first connecting portion that connects the other end of the first bus bar portion and one end of the parallel portion of the second bus bar portion, and a parallel portion of the second bus bar portion.
  • a second connecting portion connecting the end and one end of the third bus bar portion.
  • Each of the first connecting portion and the second connecting portion of the second bus bar portion has a shape curved convexly toward the side away from the parallel portion of the second bus bar portion in a side view.
  • the second bus bar portion includes a connecting portion that connects the other end of the first bus bar portion and one end of the third bus bar portion.
  • the connecting portion is connected to the other end of the first bus bar portion, and has a first connecting portion having a shape curved in a convex shape toward the side away from the first bus bar portion in the extending direction of the first bus bar portion, and a third bus bar.
  • a second connecting part having a shape curved in a convex shape on the side away from the third bus bar part in the extending direction of the third bus bar part.
  • the second bus bar portion includes a connecting portion that connects the other end of the first bus bar portion and one end of the third bus bar portion.
  • the connecting portion has a flat shape.
  • each of the first magnetic sensor and the second magnetic sensor detects the strength of the magnetic field generated by the current flowing through the bus bar with an odd function input / output characteristic.
  • a calculation unit is further provided that calculates the value of the current by calculating each detection value of the first magnetic sensor and the second magnetic sensor.
  • 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 unit is a subtractor or a differential amplifier.
  • 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 calculation unit is an adder or a summing amplifier.
  • a current sensor that can reduce the influence of an external magnetic field can be easily manufactured.
  • FIG. 4 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 viewed from the direction of arrows IV-IV in FIG. 1.
  • FIG. 9 is a diagram schematically showing a generated magnetic field in the cross-sectional view of the current sensor according to the second embodiment of the present invention as viewed from the direction of the arrow IX-IX in FIG. 8. It is a magnetic flux diagram which shows the result of having simulated the magnetic flux density of the magnetic field which generate
  • FIG. 12 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 in the periphery of the bus bar of the current sensor according to the comparative example as seen from the XIII-XIII line arrow direction of FIG. is there.
  • 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 first example of a state in which the bus bar and the external wiring of the current sensor according to the present embodiment are connected.
  • FIG. 3 is a perspective view showing a second example of a state in which the bus bar of the current sensor according to the present embodiment and the external wiring 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, a second bus bar portion, and a third bus bar portion 113 that are electrically connected in series.
  • the first bus bar portion 111 and the third bus bar portion 113 extend in parallel with a space between each other, and are connected to each other by the second bus bar portion.
  • the second bus bar portion includes a parallel portion 112 extending in parallel with an interval from each of the first bus bar portion 111 and the third bus bar portion 113.
  • the second bus bar portion includes a first connecting portion 114 that connects the other end in the longitudinal direction of the first bus bar portion 111 and one end in the longitudinal direction of the parallel portion 112 of the second bus bar portion, and a parallel of the second bus bar portion.
  • 2nd connection part 115 which connects the other end of the longitudinal direction of the part 112, and the longitudinal end of the 3rd bus-bar part 113 is included.
  • the first bus bar part 111, the parallel part 112 of the second bus bar part, and the third bus bar part 113 are arranged at equal intervals.
  • Each of the first bus bar portion 111, the parallel portion 112 of the second bus bar portion, and the third bus bar portion 113 has a rectangular parallelepiped shape.
  • the shape of each of the first bus bar portion 111, the parallel portion 112 of the second bus bar portion, and the third bus bar portion 113 is not limited to a rectangular parallelepiped shape, and may be, for example, a cylindrical shape.
  • the first connecting portion 114 of the second bus bar portion extends linearly in a side view and is orthogonal to each of the first bus bar portion 111 and the parallel portion 112 of the second bus bar portion.
  • the second connecting portion 115 of the second bus bar portion extends linearly in a side view and is orthogonal to each of the parallel portion 112 and the third bus bar portion 113 of the second bus bar portion.
  • Each of the 1st connection part 114 and the 2nd connection part 115 of a 2nd bus-bar part has a rectangular parallelepiped shape.
  • each shape of the 1st connection part 114 of the 2nd bus-bar part and the 2nd connection part 115 is not restricted to a rectangular parallelepiped shape, For example, a column shape may be sufficient.
  • the bus bar 110 has an S-shape when viewed from the side.
  • the bus bar 110 By configuring the bus bar 110 with one bus bar member having a bent shape so as to be folded back as in this embodiment, the bus bar 110 having a high mechanical strength and a symmetrical shape can be obtained.
  • the shape of the bus bar 110 is not limited to this, and the bus bar 110 may have the first bus bar part 111, the second bus bar part, 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, casting, or forging.
  • the direction 11 in which the current flows through the first bus bar portion 111 and the direction 15 in which the current flows through the third bus bar portion 113 are the same.
  • the direction 11 in which current flows through the first bus bar portion 111, the direction 15 in which current flows through the third bus bar portion 113, and the direction 13 in which current flows through the parallel portion 112 of the second bus bar portion 113 are opposite.
  • the direction 12 in which the current flows through the first connecting portion 114 of the second bus bar portion is the same as the direction 14 in which the current flows through the second connecting portion 115 of the second bus bar portion.
  • the external wiring includes an input wiring 170 having an input terminal and an output wiring 171 having an output terminal.
  • the input terminal 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 one end in the longitudinal direction of the first bus bar portion 111, and the other in the longitudinal direction of the third bus bar portion 113.
  • a second through hole 113h is provided at the end.
  • Each of first through hole 111h and second through hole 113h extends in the width direction of bus bar 110a.
  • the bolt 190 is inserted into the annular portion of the input terminal of the input wiring 170, the first through hole 111h, and the washer 181, and the bolt 190 and the nut 180 are fastened. 170 is connected.
  • the bolt 190 is inserted into the annular portion of the output terminal of the output wiring 171, the second through hole 113 h and the washer 181, and the bolt 190 and the nut 180 are fastened, whereby the third bus bar portion 113 and the output wiring are connected. 171 is connected.
  • a first female screw 111s is provided at one end in the longitudinal direction of the first bus bar portion 111, and the other end in the longitudinal direction of the third bus bar portion 113.
  • the second female screw 113s is provided in the first.
  • Each of the first female screw 115s and the second female screw 113s extends in a direction in which the first bus bar portion 111, the parallel portion 112 of the second bus bar portion, and the third bus bar portion 113 are arranged.
  • the bolt 190 is inserted into the annular portion of the input terminal of the input wiring 170, and the bolt 190 and the first female screw 111s are fastened to connect the first bus bar portion 111 and the input wiring 170.
  • the third bus bar portion 113 and the output wiring 171 are connected by inserting the bolt 190 into the annular portion of the output terminal of the output wiring 171 and fastening the bolt 190 and the second female screw 113s.
  • bus bar 110b In the bus bar 110b according to the second example, a nut for connection with the external wiring is not necessary, and therefore, the connection with the external wiring becomes easier as compared with the bus bar 110a according to the first example.
  • the current input to the first bus bar portion 111 is converted into the first connecting portion 114, the parallel portion 112, and the second connecting portion of the second bus bar portion. 115 flows in this order and is output from the third bus bar unit 113.
  • connection method of the bus bar 110 and the external wiring is not limited to the above.
  • the first bus bar portion 111 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 parallel portion 112 of the second bus bar portion facing each other.
  • the second magnetic sensor 121 is located between the parallel part 112 and the third bus bar part 113 of the second bus bar part facing each other.
  • the first magnetic sensor 120 is a direction orthogonal to the direction in which the first bus bar part 111 and the third bus bar part 113 are arranged, and a direction orthogonal to the extending direction of the first bus bar part 111. 1 has a detection axis in the direction indicated by the arrow 120a.
  • the first magnetic sensor 120 has a direction orthogonal to the direction in which the first bus bar portion 111, the parallel portion 112 of the second bus bar portion, and the third bus bar portion 113 are arranged, and the second bus bar portion. 1 has a detection axis in a direction indicated by an arrow 120a in FIG. 1, which is a direction orthogonal to the extending direction of the parallel portion 112.
  • the second magnetic sensor 121 is in a direction orthogonal to the direction in which the first bus bar part 111 and the third bus bar part 113 are arranged, and in a direction orthogonal to the extending direction of the third bus bar part 113. 1 has a detection axis in the direction indicated by the arrow 121a.
  • the second magnetic sensor 121 includes a first bus bar portion 111, a direction perpendicular to the direction in which the parallel portion 112 of the second bus bar portion and the third bus bar portion 113 are arranged, and the second bus bar portion. 1 has a detection axis in a direction indicated by an arrow 121a in FIG. 1, which is a direction orthogonal to the extending direction of the parallel portion 112.
  • 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 and the second magnetic sensor 121 an open-loop magnetic field measurement without an exciting coil portion may be performed.
  • the first magnetic sensor 120 and the second magnetic sensor 121 output via an amplifier and a converter that amplify while linearly amplifying or correcting the output of the element.
  • the first magnetic sensor 120 and the second magnetic sensor 121 may perform a closed loop magnetic field measurement having an exciting coil section.
  • each of the first magnetic sensor 120 and the second magnetic sensor 121 includes a sensor circuit in which a closed loop of an exciting coil is configured.
  • a drive current is supplied to the excitation coil unit from the excitation coil drive unit.
  • a magnetic field generated by the drive current flowing through the exciting coil is applied to the first magnetic sensor 120 and the second magnetic sensor 121.
  • a magnetic field generated by the current to be measured flowing through the bus bar 110 is also applied to the first magnetic sensor 120 and the second magnetic sensor 121. Therefore, the first magnetic sensor 120 and the second magnetic sensor 121 are applied with the magnetic field generated from the exciting coil and the magnetic field generated by the current to be measured flowing through the bus bar 110 in an overlapping manner.
  • the strength of the magnetic field applied so as to overlap the first magnetic sensor 120 and the second magnetic sensor 121 becomes a value obtained by superimposing them according to the so-called superposition principle.
  • the exciting coil driving unit supplies a driving current to the exciting coil unit so that the strength of the magnetic field applied to the first magnetic sensor 120 and the second magnetic sensor 121 is zero due to the negative feedback.
  • the measurement is performed in a state in which a magnetic field having a certain strength (approximately 0) is applied to the first magnetic sensor 120 and the second magnetic sensor 121.
  • a magnetic field having a certain strength approximately 0
  • the influence of the nonlinearity of the input / output characteristics (the relationship between the input magnetic field and the output voltage) of the sensor 120 and the second magnetic sensor 121 on the linearity of the measurement result can be reduced.
  • 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 unit.
  • the calculation unit is not limited to this, and a differential amplifier or the like may be used.
  • FIG. 4 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 IV-IV in FIG.
  • the detection axis direction of the first magnetic sensor 120 and the second magnetic sensor 121 is the X direction
  • the direction in which the first bus bar part 111, the parallel part 112 of the second bus bar part and the third bus bar part 113 are arranged is Y. Shown as direction.
  • the extending direction of the parallel portion 112 of the second bus bar portion is the Z direction.
  • a leftward 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.
  • the right 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 located between 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 directions of the detection axes with positive detection values may be opposite to each other (180 ° opposite).
  • 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 or an addition amplifier is used as the calculation unit instead of the subtracter 130.
  • the adder or the addition amplifier adds the detection value of the first magnetic sensor 120 and the detection value of the second magnetic sensor 121, thereby obtaining the absolute value of the detection value of the first magnetic sensor 120.
  • the absolute value of the detection value of the second magnetic sensor 121 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.
  • an adder or an addition amplifier adds the detection value of the first magnetic sensor 120 and the detection value of the second magnetic sensor 121, 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.
  • an adder or an addition amplifier may be used as the calculation unit in place of the subtracter 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 third bus bar portion 113 are located point-symmetrically with respect to the center point of the parallel portion 112 of the second bus bar portion in the cross section.
  • the first bus bar part 111 and the third bus bar part 113 are in cross section with respect to each other about the center line of the parallel part 112 of the second bus bar part in the direction of the detection axis of the first magnetic sensor 120 and the second magnetic sensor 121. Located in line symmetry.
  • first magnetic sensor 120 and the second magnetic sensor 121 are located symmetrically with respect to each other about the center point of the parallel portion 112 of the second bus bar portion in the cross section.
  • first magnetic sensor 120 and the second magnetic sensor 121 are cross-sectionally crossed with respect to the center line of the parallel portion 112 of the second bus bar portion in the direction of the detection axis of the first magnetic sensor 120 and the second magnetic sensor 121. Located in line symmetry.
  • FIG. 5 is a cross-sectional view showing a state in which the first bus bar part and the parallel part of the second bus bar part are arranged point-symmetrically with each other, and the first magnetic sensor and the second magnetic sensor are arranged point-symmetric with each other. is there. 5 shows the same cross-sectional view as FIG.
  • the first bus bar portion 111 and the third bus bar portion 113 are positioned symmetrically with respect to each other about the center point 112 c of the parallel portion 112 of the second bus bar portion in the cross section.
  • the first magnetic sensor 120y and the second magnetic sensor 121y are positioned symmetrically with respect to each other about the center point 112c of the parallel portion 112 of the second bus bar portion in the cross section.
  • the magnetic field 112e that is generated by the current to be measured flowing through the bus bar 110 and circulates around the parallel portion 112 of the second bus bar portion is equivalent and reverse to each of the first magnetic sensor 120y and the second magnetic sensor 121y. Applied in the direction.
  • the subtractor 130 subtracts the detection value of the second magnetic sensor 121y from the detection value of the first magnetic sensor 120y, the detection value of the magnetic field 112e is doubled.
  • 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. 6 is a cross-sectional view showing a state in which the first bus bar portion and the parallel portion of 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. is there. 6 shows the same cross-sectional view as FIG.
  • the first bus bar part 111 and the third bus bar part 113 are in the cross section, and the center of the parallel part 112 of the second bus bar part in the direction of the detection axis of the first magnetic sensor 120 and the second magnetic sensor 121. They are positioned symmetrically with respect to each other about the line 112x.
  • first magnetic sensor 120z and the second magnetic sensor 121z are cross-sectionally centered on the center line 112x of the parallel portion 112 of the second bus bar portion in the direction of the detection axis of the first magnetic sensor 120z and the second magnetic sensor 121z. They are line-symmetric with each other.
  • the magnetic field 112e that is generated by the current to be measured flowing through the bus bar 110 and circulates around the parallel portion 112 of the second bus bar portion is equivalent and reverse to each of the first magnetic sensor 120z and the second magnetic sensor 121z. Applied in the direction.
  • 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 112e 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 parallel portion 112 of the second bus bar portion due to the current to be measured flowing through the bus bar 110 changes relatively depending on the distance from each bus bar portion. small. Therefore, high accuracy is not required for the arrangement of the first magnetic sensor 120.
  • the magnetic field generated between the parallel portion 112 and the third bus bar portion 113 of the second bus bar portion due to the current to be measured flowing through the bus bar 110 is relatively small with respect to 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.
  • the dimension of the length in the extending direction of the parallel part 112 of the second bus bar part is not less than the dimension of the width of the second bus bar part.
  • the 1st magnetic sensor 120 can be arrange
  • the second magnetic sensor 121 can be arranged at a predetermined distance or more away from the second connecting portion 115 of the second bus bar portion. As a result, high accuracy is not required for the arrangement of the first magnetic sensor 120 and the second magnetic sensor 121 in the extending direction of the parallel portion 112 of the second bus bar portion. Therefore, the current sensor 100 can be easily manufactured.
  • 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 200 according to Embodiment 2 of the present invention.
  • FIG. 8 is a side view showing the configuration of the current sensor 200 according to the present embodiment.
  • 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 current value 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 part 211, a second bus bar part, and a third bus bar part 213 that are electrically connected in series.
  • the first bus bar portion 211 and the third bus bar portion 213 extend in parallel with a space between each other, and are connected to each other by the second bus bar portion.
  • the second bus bar portion includes a parallel portion 212 that extends in parallel with a space from each of the first bus bar portion 211 and the third bus bar portion 213.
  • the second bus bar portion includes a first connecting portion 214 that connects the other end in the longitudinal direction of the first bus bar portion 211 and one end in the longitudinal direction of the parallel portion 212 of the second bus bar portion, and a parallel of the second bus bar portion.
  • 2nd connection part 215 which connects the other end of the longitudinal direction of the part 212 and the end of the 3rd bus-bar part 213 in the longitudinal direction is included.
  • the first bus bar portion 211, the parallel portion 212 of the second bus bar portion, and the third bus bar portion 213 are arranged at equal intervals. That is, the distance dimension G 1 between the first bus bar part 211 and the parallel part 212 of the second bus bar part and the distance dimension G 2 between the parallel part 212 of the second bus bar part and the third bus bar part 213. Is equal to
  • the first connecting portion 214 of the second bus bar portion extends linearly in a side view and is orthogonal to each of the first bus bar portion 211 and the parallel portion 212 of the second bus bar portion.
  • the second connecting portion 215 of the second bus bar portion extends linearly in a side view and is orthogonal to each of the parallel portion 212 and the third bus bar portion 213 of the second bus bar portion.
  • the first magnetic sensor 220 is located between the first bus bar portion 211 and the parallel portion 212 of the second bus bar portion facing each other.
  • the second magnetic sensor 221 is located between the parallel part 212 and the third bus bar part 213 of the second bus bar part facing each other.
  • the first magnetic sensor 220 is a direction orthogonal to the direction in which the first bus bar portion 211 and the third bus bar portion 213 are aligned, and a direction orthogonal to the extending direction of the first bus bar portion 211. 7 has a detection axis in the direction indicated by the arrow 220a.
  • the first magnetic sensor 220 includes a second bus bar portion that is orthogonal to the direction in which the first bus bar portion 211, the parallel portion 212 of the second bus bar portion, and the third bus bar portion 213 are aligned.
  • 7 has a detection axis in a direction indicated by an arrow 220a in FIG. 7, which is a direction orthogonal to the extending direction of the parallel portion 212.
  • the second magnetic sensor 221 is a direction orthogonal to the direction in which the first bus bar portion 211 and the third bus bar portion 213 are aligned, and a direction orthogonal to the extending direction of the third bus bar portion 213. 7 has a detection axis in the direction indicated by the arrow 221a.
  • the second magnetic sensor 221 includes the first bus bar portion 211, the direction perpendicular to the direction in which the parallel portion 212 of the second bus bar portion and the third bus bar portion 213 are aligned, and the second bus bar portion. 7 has a detection axis in the direction indicated by the arrow 221a in FIG. 7, which is a direction orthogonal to the extending direction of the parallel portion 212.
  • 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 the first connection wiring 241.
  • the second magnetic sensor 221 is electrically connected to the subtracter 230 by the second connection wiring 242.
  • 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 dimension H of each width of the first bus bar part 211, the second bus bar part, and the third bus bar part 213 is This is 1.5 times the distance dimensions G 1 and G 2 between the bus bar portions adjacent to each other.
  • the dimension H of the width of the first bus bar 211, the dimensions of the width of the second bus bar portion H, and the dimension H in the width of the third bus bar portions 213 are each 1.5G 1.
  • the width dimension H of the first bus bar portion 211, the width dimension H of the second bus bar portion, and the width dimension H of the third bus bar portion 213 are each 1.5 G 1 or more.
  • each is 2.0 G 1 or more.
  • variety of the 1st bus-bar part 211, the 2nd bus-bar part, and the 3rd bus-bar part 213 may mutually differ.
  • the bus bar 210 is formed by bending one plate-like bus bar member.
  • the direction 21 in which the current flows through the first bus bar portion 211 and the direction 25 in which the current flows through the third bus bar portion 213 are the same.
  • the direction 21 in which current flows in the first bus bar portion 211, the direction 25 in which current flows in the third bus bar portion 213, and the direction 23 in which current flows in the parallel portion 212 of the second bus bar portion are opposite.
  • the direction 22 in which the current flows through the first connecting portion 214 of the second bus bar portion and the direction 24 in which the current flows through the second connecting portion 215 of the second bus bar portion are the same.
  • 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 FIGS. For this reason, the current input to the first bus bar portion 211 flows through the first connecting portion 214, the parallel portion 212, and the second connecting portion 215 of the second bus bar portion in this order, and is output from the third bus bar portion 213.
  • FIG. 9 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 the arrow IX-IX in FIG.
  • the detection axis direction of the first magnetic sensor 220 and the second magnetic sensor 221 is the X direction
  • the direction in which the first bus bar portion 211, the parallel portion 212 of the second bus bar portion and the third bus bar portion 213 are aligned is Y. Shown as direction.
  • the extending direction of the parallel portion 212 of the second bus bar portion is the Z direction.
  • a leftward magnetic field in the figure is applied to the first magnetic sensor 220 in the direction of the detection axis indicated by the arrow 220a.
  • the right 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. 10 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. 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 210 around the bus bar 210 of the current sensor 200 according to the present embodiment. 10 and 11 show the same cross section as FIG.
  • FIG. 12 is a plan view showing the shape of the bus bar 910 included in the current sensor according to the comparative example.
  • 13 is a cross-sectional view of 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 around the bus bar 910 of the current sensor according to the comparative example, as viewed from the direction of the arrow XIII-XIII in FIG. FIG.
  • 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 portion 911 and one end of the second bus bar portion 912 are connected by a connecting portion 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. 14 shows the relationship between the distance from the central portion of the parallel portion 212 of the second bus bar portion in the left-right direction in FIG. 11 in the horizontal direction in FIG. 11 and the magnetic flux density in the current sensor 200 according to the present embodiment. It is a graph which shows. In FIG. 14, the vertical axis represents the magnetic flux density (mT), and the horizontal axis represents the distance (mm) from the surface of the parallel portion 212 of the second bus bar portion.
  • FIG. 15 shows a current sensor according to a comparative example in which 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 left-right 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 line having a magnetic flux density of 0.7 mT is E 11
  • the line having 1.4 mT is E 12
  • the line having 2.1 mT is E 13
  • the line having 2.8 mT is E 14
  • 3 E 15 line is .5mT
  • E 16 a line is 4.2MT
  • a line is 4.9mT E 17
  • a line is 5.6mT E 18, show a line is 6.3mT in E 19 ing.
  • the line having a magnetic flux density of 0.6 mT is E 1
  • the line having 1.2 mT is E 2
  • the line having 1.8 mT is E 3
  • the line having 2.4 mT is E 4
  • a line that is 0.0 mT is E 5
  • a line that is 3.6 mT is E 6
  • a line that is 4.2 mT is E 7
  • a line that is 4.8 mT is E 8
  • a line that is 5.4 mT is E 9
  • 6 A line that is 0.0 mT is indicated by E 10 .
  • the width H of each of the first bus bar portion 211, the second bus bar portion, and the third bus bar portion 213 is the distance between the adjacent bus bar portions G 1 , G 1.5 times 2
  • the magnetic flux lines of the magnetic field generated between the first bus bar portion 211 and the parallel portion 212 of the second bus bar portion, and the parallel portion 212 and the third bus bar portion of the second bus bar portion extend substantially linearly along the bus bar portions in the left-right direction in the drawing.
  • the horizontal direction in the figure is the direction of the detection axis of the first and second magnetic sensors 220 and 221.
  • a magnetic flux density of 6. is provided in the vicinity of the first bus bar portion 211 between the first bus bar portion 211 and the parallel portion 212 of the second bus bar portion. A region higher than 3 mT is formed.
  • the magnetic flux density is almost 6.1 mT at the parallel portion 212 side of the second bus bar portion in the center in the horizontal direction in the figure. A region that has not changed is formed.
  • a region having a magnetic flux density higher than 6.3 mT is formed in the vicinity of the third bus bar portion 213 between the parallel portion 212 of the second bus bar portion and the third bus bar portion 213.
  • the magnetic flux density is about 6.1 mT in the center part of the left-right direction in the figure on the parallel part 212 side of the 2nd bus-bar part. A region that has not changed is formed.
  • the first bus bar part 911 and the second bus bar part 912 are positioned between the first bus bar part 911 and the second bus bar part 912 until the middle position.
  • the magnetic flux density rapidly decreases, and there is no region where the magnetic flux density hardly changes.
  • the magnetic flux density increases as the distance from the vicinity of the second bus bar portion 912 increases to a position intermediate between the first bus bar portion 911 and the second bus bar portion 912. 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 first bus bar portion 211 than the parallel portion 212 of the second bus bar portion, and the second magnetic sensor 221 is parallel to the second bus bar portion. Since the first magnetic sensor 220 and the second magnetic sensor 221 can be arranged in a region having a high magnetic flux density by being arranged closer to the third bus bar part 213 than the part 212, the SN ratio (signal-noise ratio) of the current sensor 200 Can be high. In this case, the sensitivity of the current sensor 200 can be improved.
  • the first magnetic sensor 220 is disposed closer to the parallel portion 212 of the second bus bar portion than the first bus bar portion 211, and the second magnetic sensor 221 is disposed from the third bus bar portion 213. 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 parallel portion 212 of the second bus bar portion, the first magnetic sensor 220 and the second magnetic sensor 220 High accuracy is not required for the arrangement of the magnetic sensor 221. In this case, the current sensor 200 can be easily manufactured. This effect is stably obtained when the dimension H of each width of the first bus bar part 211, the second bus bar part, and the third bus bar part 213 is 1.5 G 1 or more, and is 2.0 G 1 or more. The case becomes noticeable.
  • the length L 10 in the extending direction of the parallel portion 212 of the second bus bar portion is equal to or greater than the width H of the second bus bar portion.
  • the 1st magnetic sensor 220 can be arranged apart from the 1st connection part 214 of the 2nd bus bar part more than predetermined distance.
  • the second magnetic sensor 221 can be arranged at a predetermined distance or more away from the second connection part 215 of the second bus bar part. As a result, high accuracy is not required for the arrangement of the first magnetic sensor 220 and the second magnetic sensor 221 in the extending direction of the parallel portion 212 of the second bus bar portion. Therefore, the current sensor 200 can be easily manufactured.
  • the influence of the external magnetic field can be reduced. Moreover, since the high precision is not requested
  • the bus bar 210 according to the present embodiment has a region where the magnetic flux density is lower than 0.6 mT 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.
  • the current sensor 300 according to the present embodiment is different from the current sensor 200 according to the second 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 3 of the present invention. In FIG. 16, only the bus bar of the current sensor is illustrated. As shown in FIG. 16, the current sensor 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 includes a first magnetic sensor and a second magnetic sensor (not shown) 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 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 and the second magnetic sensor.
  • the bus bar 310 includes a first bus bar portion 311, a second bus bar portion, and a third bus bar portion 313 that are electrically connected in series.
  • the first bus bar portion 311 and the third bus bar portion 313 extend in parallel with a space between each other, and are connected to each other by the second bus bar portion.
  • the second bus bar portion includes a parallel portion 312 extending in parallel with a space from each of the first bus bar portion 311 and the third bus bar portion 313.
  • the second bus bar portion includes a first connecting portion 314 that connects the other end in the longitudinal direction of the first bus bar portion 311 and one end in the longitudinal direction of the parallel portion 312 of the second bus bar portion, and a parallel of the second bus bar portion.
  • 2nd connection part 315 which connects the other end of the longitudinal direction of the part 312 and the longitudinal end of the 3rd bus-bar part 313 is included.
  • the bus bar 310 includes an input terminal portion 317 for inputting current to the first bus bar portion 311, a lead portion 316 that connects the other end of the input terminal portion 317 and one end of the first bus bar portion 311 in the longitudinal direction. including.
  • the third bus bar portion 313 serves as an output terminal portion.
  • the input terminal part 317 and the third bus bar part 313 as the output terminal part are located on the same plane and extend in opposite directions.
  • a first through hole 317 h is provided at one end of the input terminal portion 317, and a second through hole 313 h is provided at the other end in the longitudinal direction of the third bus bar portion 313.
  • the first bus bar portion 311, the parallel portion 312 of the second bus bar portion, and the third bus bar portion 313 are arranged at equal intervals.
  • the first connecting portion 314 of the second bus bar portion extends linearly in a side view and is orthogonal to each of the first bus bar portion 311 and the parallel portion 312 of the second bus bar portion.
  • the second connecting portion 315 of the second bus bar portion extends linearly in a side view and is orthogonal to each of the parallel portion 312 and the third bus bar portion 313 of the second bus bar portion.
  • the lead-out portion 316 extends linearly in side view and is orthogonal to each of the first bus bar portion 311 and the input terminal portion 317.
  • 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 and the second magnetic sensor, the current sensor can be easily manufactured.
  • the bus bar 310 may be insert-molded using an insulating resin. In this case, only the periphery of the first through hole 317h and the second through hole 313h is exposed, and the other part of the bus bar 310 is molded with an insulating resin. By doing in this way, parts other than a connection part with the external wiring of the bus-bar 310 can be insulation-sealed.
  • the material of the insulating resin is a thermoplastic resin or a thermosetting resin, such as acrylonitrile butadiene styrene (ABS) resin, polyphenylene sulfide (PPS) resin, liquid crystal polymer (LCP), polybutylene terephthalate (PBT) resin or polyamide.
  • Resin (PA) or the like is preferable from the viewpoint of heat resistance and mold accuracy.
  • the magnetic sensor When the bus bar 310 is insert-molded, the magnetic sensor may be insert-molded together with the bus bar 310, or the magnetic sensor may be accommodated in a recess provided in the molded insulating resin.
  • the current sensor 400 according to the present embodiment is different from the current sensor 200 according to the second embodiment only in that the first connecting portion and the second connecting portion of the second bus bar portion are curved. Do not repeat.
  • FIG. 17 is a perspective view showing a configuration of a current sensor according to Embodiment 4 of the present invention. In FIG. 17, the calculation unit is not shown.
  • the current sensor 400 includes a bus bar 410 through which a current to be measured flows.
  • the current sensor 400 includes a first magnetic sensor 420 and a second magnetic sensor 421 that detect the strength of a 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 current value by subtracting the detection values of the first magnetic sensor 420 and the second magnetic sensor 421.
  • the bus bar 410 includes a first bus bar part 411, a second bus bar part, and a third bus bar part 413 that are electrically connected in series.
  • the first bus bar portion 411 and the third bus bar portion 413 extend in parallel with a space therebetween and are connected to each other by the second bus bar portion.
  • the second bus bar portion includes a parallel portion 412 extending in parallel with an interval from each of the first bus bar portion 411 and the third bus bar portion 413.
  • the second bus bar portion includes a first connecting portion 414 that connects the other end in the longitudinal direction of the first bus bar portion 411 and one end in the longitudinal direction of the parallel portion 412 of the second bus bar portion, and a parallel of the second bus bar portion.
  • 2nd connection part 415 which connects the other end of the longitudinal direction of the part 412 and the longitudinal end of the 3rd bus-bar part 413 is included.
  • first bus bar portion 411, the parallel portion 412 of the second bus bar portion, and the third bus bar portion 413 are arranged at equal intervals.
  • Each of the first connecting portion 414 and the second connecting portion 415 of the second bus bar portion has a shape curved convexly toward the side away from the parallel portion 412 of the second bus bar portion in a side view.
  • first connecting portion 414 of the second bus bar portion is curved in a convex shape on the right side in FIG.
  • the second connecting portion 415 of the second bus bar portion is curved in a convex shape on the left side in FIG.
  • the bus bar 410 by configuring the bus bar 410 with one bus bar member having a curved shape so as to be folded back, the bus bar 410 having a high mechanical strength and a symmetrical shape can be obtained.
  • the bus bar 410 of the current sensor 400 according to the present embodiment is bent at the first connecting portion 214 and the second connecting portion 215 of the second bus bar portion like the bus bar 210 of the current sensor 200 according to the second embodiment.
  • the first connecting portion 414 and the second connecting portion 415 are curved. Accordingly, it is possible to form the bus bar 410 by bending one plate-like bus bar member made of a material having high hardness, and the mechanical strength of the bus bar 410 can be made higher than that of the bus bar 210 of the second embodiment. it can.
  • the first magnetic sensor 420 is located between the first bus bar portion 411 and the parallel portion 412 of the second bus bar portion facing each other.
  • the second magnetic sensor 421 is located between the parallel part 412 and the third bus bar part 413 of the second bus bar part facing each other.
  • the first magnetic sensor 420 is a direction orthogonal to the direction in which the first bus bar portion 411 and the third bus bar portion 413 are aligned, and a direction orthogonal to the extending direction of the first bus bar portion 411. 17 has a detection axis in a direction indicated by an arrow 420a.
  • the first magnetic sensor 420 has a direction that is orthogonal to the direction in which the first bus bar portion 411, the parallel portion 412 of the second bus bar portion, and the third bus bar portion 413 are aligned, and the second bus bar portion. 17 has a detection axis in a direction indicated by an arrow 420a in FIG. 17, which is a direction orthogonal to the extending direction of the parallel portion 412.
  • the second magnetic sensor 421 is a direction orthogonal to the direction in which the first bus bar portion 411 and the third bus bar portion 413 are aligned, and a direction orthogonal to the extending direction of the third bus bar portion 413. 17 has a detection axis in a direction indicated by an arrow 421a.
  • the second magnetic sensor 421 has a direction orthogonal to the direction in which the first bus bar portion 411, the parallel portion 412 of the second bus bar portion, and the third bus bar portion 413 are aligned, and the second bus bar portion. 17 has a detection axis in a direction indicated by an arrow 421a in FIG. 17, which is a direction orthogonal to the extending direction of the parallel portion 412.
  • the first magnetic sensor 420 and the second magnetic sensor 421 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 420 is electrically connected to the subtractor through a connection wiring (not shown).
  • the second magnetic sensor 421 is electrically connected to the subtractor through a connection wiring (not shown).
  • the subtracter calculates the value of the current flowing through the bus bar 410 by subtracting the detection value of the first magnetic sensor 420 and the detection value of the second magnetic sensor 421.
  • 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 and the second magnetic sensor, the current sensor can be easily manufactured.
  • FIG. 18 is a perspective view showing a configuration of a current sensor according to Embodiment 5 of the present invention. In FIG. 18, the calculation unit is not shown.
  • the current sensor 500 includes a bus bar 510 through which a current to be measured flows.
  • the current sensor 500 includes a first magnetic sensor 520 and a second magnetic sensor 521 that detect the strength of a magnetic field generated by the current to be measured flowing through the bus bar 510 with an odd function input / output characteristic.
  • the current sensor 500 includes a subtracter (not shown) that is a calculation unit that calculates the current value by subtracting the detection values of the first magnetic sensor 520 and the second magnetic sensor 521.
  • the bus bar 510 includes a first bus bar portion 511, a second bus bar portion, and a third bus bar portion 513 that are electrically connected in series.
  • the first bus bar portion 511 and the third bus bar portion 513 extend in parallel with a space between each other, and are connected to each other by the second bus bar portion.
  • the second bus bar portion includes a parallel portion 512 that extends in parallel with a space from each of the first bus bar portion 511 and the third bus bar portion 513.
  • the second bus bar portion includes a first connecting portion 514 that connects the other end in the longitudinal direction of the first bus bar portion 511 and one end in the longitudinal direction of the parallel portion 512 of the second bus bar portion, and a parallel of the second bus bar portion.
  • 2nd connection part 515 which connects the other end of the longitudinal direction of the part 512, and the end of the 3rd bus-bar part 513 in the longitudinal direction.
  • the bus bar 510 includes an input terminal portion 516 for inputting current to the first bus bar portion 511 and an output terminal portion 517 for outputting current from the third bus bar portion 513.
  • the 1st bus-bar part 511, the parallel part 512 of a 2nd bus-bar part, and the 3rd bus-bar part 513 are arrange
  • the first connecting portion 514 of the second bus bar portion extends linearly in a side view and is orthogonal to each of the first bus bar portion 511 and the parallel portion 512 of the second bus bar portion.
  • the second connecting portion 515 of the second bus bar portion extends linearly in a side view and is orthogonal to each of the parallel portion 512 and the third bus bar portion 513 of the second bus bar portion.
  • the input terminal portion 516 extends linearly in a side view and is orthogonal to the first bus bar portion 511.
  • the output terminal portion 517 extends linearly in a side view and is orthogonal to the third bus bar portion 513.
  • the first magnetic sensor 520 is located between the first bus bar portion 511 and the parallel portion 512 of the second bus bar portion facing each other.
  • the second magnetic sensor 521 is located between the parallel part 512 and the third bus bar part 513 of the second bus bar part facing each other.
  • the first magnetic sensor 520 is a direction orthogonal to the direction in which the first bus bar portion 511 and the third bus bar portion 513 are aligned, and a direction orthogonal to the extending direction of the first bus bar portion 511. 18 has a detection axis in a direction indicated by an arrow 520a.
  • the first magnetic sensor 520 includes the first bus bar portion 511, the direction parallel to the direction in which the parallel portion 512 of the second bus bar portion and the third bus bar portion 513 are aligned, and the second bus bar portion. 18 has a detection axis in a direction indicated by an arrow 520a in FIG. 18, which is a direction orthogonal to the extending direction of the parallel portion 512.
  • the second magnetic sensor 521 is a direction orthogonal to the direction in which the first bus bar portion 511 and the third bus bar portion 513 are aligned, and a direction orthogonal to the extending direction of the third bus bar portion 513.
  • 18 has a detection axis in the direction indicated by the arrow 521a.
  • the second magnetic sensor 521 has a direction perpendicular to the direction in which the first bus bar portion 511, the parallel portion 512 of the second bus bar portion, and the third bus bar portion 513 are aligned, and the second bus bar portion.
  • 18 has a detection axis in a direction indicated by an arrow 521a in FIG. 18, which is a direction orthogonal to the extending direction of the parallel portion 512.
  • the first magnetic sensor 520 and the second magnetic sensor 521 output a positive value when a magnetic field directed in one direction of the detection axis is detected, and outputs 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 520 is electrically connected to the subtractor through a connection wiring (not shown).
  • the second magnetic sensor 521 is electrically connected to the subtractor through connection wiring (not shown).
  • the subtracter calculates the value of the current to be measured flowing through the bus bar 510 by subtracting the detection value of the second magnetic sensor 521 from the detection value of the first magnetic sensor 520.
  • the thickness dimension T of the bus bar 510 is increased, the surface of the first bus bar portion 511 opposite to the third bus bar portion 513 side, and the third bus bar portion 513 the first bus bar portion 511 side to reduce the distance L a between the opposite face.
  • the distance L a is smaller to the extent that does not require high precision placement of the first magnetic sensor 520 and the second magnetic sensor 521.
  • the cross-sectional area determined by the product of the width dimension H and the thickness dimension T of the bus bar 510 is increased, and the allowable current of the bus bar 510 is increased, and the enlargement of the bus bar 510 is suppressed. Can do. As a result, it is possible to suppress an increase in size of the current sensor 500 while increasing a current value measurable by the current sensor 500.
  • 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 and the second magnetic sensor, the current sensor can be easily manufactured.
  • the current sensor 600 according to the present embodiment is different from the current sensor 400 according to the fourth embodiment only in that there is no parallel portion in the second bus bar portion, and therefore the description of other configurations will not be repeated.
  • FIG. 19 is a perspective view showing a configuration of a current sensor according to Embodiment 6 of the present invention. In FIG. 19, the calculation unit is not shown.
  • a current sensor 600 includes a bus bar 610 through which a current to be measured flows.
  • the current sensor 600 includes a first magnetic sensor 620 and a second magnetic sensor 621 that detect the strength of the magnetic field generated by the current to be measured flowing through the bus bar 610 with an odd function input / output characteristic.
  • the current sensor 600 includes a subtracter (not shown) which is a calculation unit that calculates the current value by subtracting the detection values of the first magnetic sensor 620 and the second magnetic sensor 621.
  • the bus bar 610 includes a first bus bar portion 611, a second bus bar portion, and a third bus bar portion 613 that are electrically connected in series.
  • the first bus bar portion 611 and the third bus bar portion 613 extend in parallel with a space therebetween and are connected to each other by the second bus bar portion.
  • the second bus bar portion includes a connecting portion that connects the other end in the longitudinal direction of the first bus bar portion 611 and one end in the longitudinal direction of the third bus bar portion 613.
  • the connecting portion is connected to the other end in the longitudinal direction of the first bus bar portion 611 and has a shape curved in a convex shape toward the side away from the first bus bar portion 611 in the extending direction of the first bus bar portion 611.
  • Portion 614 and a second connecting portion that is connected to one end in the longitudinal direction of third bus bar portion 613 and has a shape that is convexly curved toward the side away from third bus bar portion 613 in the extending direction of third bus bar portion 613 615.
  • first connecting portion 614 of the second bus bar portion is curved in a convex shape on the right side in FIG.
  • the second connecting portion 615 of the second bus bar portion is curved in a convex shape on the left side in FIG.
  • the other end of the first connecting part 614 of the second bus bar part and one end of the second connecting part 615 are connected.
  • the bus bar 610 by configuring the bus bar 610 with one bus bar member having a curved shape so as to be folded back, the bus bar 610 having a high mechanical strength and a symmetrical shape can be obtained.
  • the first connection part 214 and the second connection part 215 of the second bus bar part are bent like the bus bar 210 of the current sensor 200 according to the second embodiment.
  • the first connecting portion 614 and the second connecting portion 615 are curved. Accordingly, it is possible to form the bus bar 610 by bending one plate-like bus bar member made of a material having high hardness, and the mechanical strength of the bus bar 610 can be made higher than that of the bus bar 210 of the second embodiment. it can.
  • the first magnetic sensor 620 is located between the first bus bar portion 611 and the first connecting portion 614 of the second bus bar portion.
  • the second magnetic sensor 621 is located between the second connecting part 615 and the third bus bar part 613 of the second bus bar part.
  • the first magnetic sensor 620 is a direction orthogonal to the direction in which the first bus bar portion 611 and the third bus bar portion 613 are aligned, and a direction orthogonal to the extending direction of the first bus bar portion 611. 19 has a detection axis in a direction indicated by an arrow 620a.
  • the second magnetic sensor 621 is a direction orthogonal to the direction in which the first bus bar portion 611 and the third bus bar portion 613 are aligned and a direction orthogonal to the extending direction of the third bus bar portion 613. 19 has a detection axis in a direction indicated by an arrow 621a.
  • the first magnetic sensor 620 and the second magnetic sensor 621 output a positive value when a magnetic field directed in one direction of the detection axis is detected, and outputs 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 620 is electrically connected to the subtractor through connection wiring (not shown).
  • the second magnetic sensor 621 is electrically connected to the subtractor through connection wiring (not shown).
  • the subtracter calculates the value of the current to be measured flowing through the bus bar 610 by subtracting the detection value of the second magnetic sensor 621 from the detection value of the first magnetic sensor 620.
  • 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 and the second magnetic sensor, the current sensor can be easily manufactured.
  • FIG. 20 is a perspective view showing a configuration of a current sensor according to Embodiment 7 of the present invention. In FIG. 20, the calculation unit is not shown.
  • a current sensor 700 includes a bus bar 710 through which a current to be measured flows.
  • the current sensor 700 includes a first magnetic sensor 720 and a second magnetic sensor 721 that detect the strength of the magnetic field generated by the current to be measured flowing through the bus bar 710 with an odd function input / output characteristic.
  • the current sensor 700 includes a subtracter (not shown) that is a calculation unit that calculates the current value by subtracting the detection values of the first magnetic sensor 720 and the second magnetic sensor 721.
  • the bus bar 710 includes a first bus bar part 711, a second bus bar part, and a third bus bar part 713 that are electrically connected in series.
  • the first bus bar portion 711 and the third bus bar portion 713 extend in parallel with a space between each other and are connected to each other by the second bus bar portion.
  • the second bus bar portion includes a connecting portion 714 that connects the other end in the longitudinal direction of the first bus bar portion 711 and one end in the longitudinal direction of the third bus bar portion 713.
  • the connection part 714 of the second bus bar part has a flat plate shape.
  • the first magnetic sensor 720 is located between the first bus bar portion 711 and the connecting portion 714 of the second bus bar portion.
  • the second magnetic sensor 721 is located between the connecting portion 714 and the third bus bar portion 713 of the second bus bar portion.
  • the first magnetic sensor 720 is a direction orthogonal to the direction in which the first bus bar portion 711 and the third bus bar portion 713 are aligned, and a direction orthogonal to the extending direction of the first bus bar portion 711. 20 has a detection axis in a direction indicated by an arrow 720a.
  • the second magnetic sensor 721 is a direction orthogonal to the direction in which the first bus bar portion 711 and the third bus bar portion 713 are aligned, and a direction orthogonal to the extending direction of the third bus bar portion 713. 20 has a detection axis in a direction indicated by an arrow 721a.
  • the first magnetic sensor 720 and the second magnetic sensor 721 output a positive value when detecting a magnetic field directed in one direction of the detection axis, and output 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 720 is electrically connected to the subtractor through a connection wiring (not shown).
  • the second magnetic sensor 721 is electrically connected to the subtractor through connection wiring (not shown).
  • the subtracter calculates the value of the current flowing through the bus bar 710 by subtracting the detection value of the second magnetic sensor 721 from the detection value of the first magnetic sensor 720.
  • 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 and the second magnetic sensor, the current sensor can be easily manufactured.

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

Abstract

La présente invention concerne un capteur de courant comprenant : une barre omnibus (110) ayant un courant à mesurer circulant à travers elle ; et un premier capteur magnétique (120) et un second capteur magnétique (121) détectant la puissance d'un champ magnétique généré par le courant circulant à travers la barre omnibus (110). La barre omnibus (110) comprend une première section de barre omnibus (111), une seconde section de barre omnibus et une troisième section de barre omnibus (113) connectées électriquement en série. La première section de barre omnibus (111) et la troisième section de barre omnibus (113) s'étendent en parallèle, avec un interstice entre elles, et sont connectées l'une à l'autre par la seconde section de barre omnibus.
PCT/JP2014/063559 2013-05-30 2014-05-22 Capteur de courant WO2014192625A1 (fr)

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JP2013114022 2013-05-30

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CN106353561A (zh) * 2016-09-12 2017-01-25 上海兴工微电子有限公司 电流检测芯片和电流检测方法
CN108254609A (zh) * 2016-12-28 2018-07-06 意法半导体股份有限公司 集成电流传感器器件和对应的电子器件
JP2018112472A (ja) * 2017-01-12 2018-07-19 日立オートモティブシステムズ株式会社 電流検出装置
CN108318728A (zh) * 2018-03-12 2018-07-24 宁波锦澄电子科技股份有限公司 一种无屏蔽抗干扰电流传感器
JP2020071100A (ja) * 2018-10-30 2020-05-07 矢崎総業株式会社 電流検出方法及び電流検出構造
JP2020148752A (ja) * 2019-03-13 2020-09-17 甲神電機株式会社 電流検出装置
KR20200126347A (ko) * 2016-12-20 2020-11-06 한국전자기술연구원 전류센서 및 그의 제조방법
JP2021052471A (ja) * 2019-09-24 2021-04-01 株式会社ケーヒン 電力変換装置
CN114034922A (zh) * 2021-11-23 2022-02-11 江苏兴宙微电子有限公司 电流传感器及电流检测芯片

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KR102072065B1 (ko) * 2018-08-24 2020-01-31 홍기철 코어리스(Coreless) 비접촉식 전류 계측 시스템

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CN106353561A (zh) * 2016-09-12 2017-01-25 上海兴工微电子有限公司 电流检测芯片和电流检测方法
KR20200126347A (ko) * 2016-12-20 2020-11-06 한국전자기술연구원 전류센서 및 그의 제조방법
KR102445270B1 (ko) * 2016-12-20 2022-09-20 한국전자기술연구원 전류센서 및 그의 제조방법
CN108254609A (zh) * 2016-12-28 2018-07-06 意法半导体股份有限公司 集成电流传感器器件和对应的电子器件
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CN110178040B (zh) * 2017-01-12 2021-07-30 日立汽车系统株式会社 电流检测装置
JP2018112472A (ja) * 2017-01-12 2018-07-19 日立オートモティブシステムズ株式会社 電流検出装置
CN108318728A (zh) * 2018-03-12 2018-07-24 宁波锦澄电子科技股份有限公司 一种无屏蔽抗干扰电流传感器
JP2020071100A (ja) * 2018-10-30 2020-05-07 矢崎総業株式会社 電流検出方法及び電流検出構造
JP2020148752A (ja) * 2019-03-13 2020-09-17 甲神電機株式会社 電流検出装置
JP2021052471A (ja) * 2019-09-24 2021-04-01 株式会社ケーヒン 電力変換装置
CN114034922A (zh) * 2021-11-23 2022-02-11 江苏兴宙微电子有限公司 电流传感器及电流检测芯片

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