WO2015115238A1 - Capteur de courant - Google Patents

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Publication number
WO2015115238A1
WO2015115238A1 PCT/JP2015/051309 JP2015051309W WO2015115238A1 WO 2015115238 A1 WO2015115238 A1 WO 2015115238A1 JP 2015051309 W JP2015051309 W JP 2015051309W WO 2015115238 A1 WO2015115238 A1 WO 2015115238A1
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WIPO (PCT)
Prior art keywords
bus bar
current
bar portion
magnetic sensor
sensor
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PCT/JP2015/051309
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English (en)
Japanese (ja)
Inventor
仁志 坂口
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株式会社村田製作所
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Publication of WO2015115238A1 publication Critical patent/WO2015115238A1/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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R33/00—Arrangements or instruments for measuring magnetic variables
    • G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
    • G01R33/06—Measuring direction or magnitude of magnetic fields or magnetic flux using galvano-magnetic devices
    • G01R33/09—Magnetoresistive devices

Definitions

  • the present invention relates to a current sensor, and more particularly to a current sensor that measures a large current.
  • Patent Document 1 JP2012-242082 (Patent Document 1) and JP2012-58150 (Patent Document 2) as prior documents disclosing current sensors capable of changing the measurement range.
  • the current sensor described in Patent Document 1 includes a first conductive path and a second conductive path that are arranged substantially in parallel and through which a current to be measured flows, and a measured current that flows through the first conductive path and the second conductive path.
  • a first magnetic sensing element and a second magnetic sensing element that output an output signal from an electric current by an induced magnetic field are provided.
  • the current sensor described in Patent Document 1 includes a first electrode connected to one end of the first conductive path, a second electrode connected to one end of the second conductive path, And a third electrode connected to the other end of the first conductive path and the second conductive path and electrically connecting the first conductive path and the second conductive path.
  • a current sensor described in Patent Document 2 includes a magnetic field detection bridge circuit including a magnetoresistive effect element whose resistance value changes due to application of an induced magnetic field from a current to be measured, an electromagnet that applies a magnetic field to the magnetoresistive effect element, A switching control circuit for controlling the magnetic field strength applied from the electromagnet to the magnetoresistive element in accordance with an output signal output from the magnetic field detection bridge circuit.
  • the current sensors described in Patent Documents 1 and 2 include a circuit for reducing the strength of the magnetic field applied to the magnetoresistive effect element, and the circuit structure is complicated.
  • the present invention has been made in view of the above problems, and an object thereof is to provide a current sensor that can measure a large current with a simple structure.
  • the current sensor includes a bus bar through which a current to be measured flows, and at least one magnetic sensor that detects the strength of a magnetic field generated by the current flowing through the bus bar.
  • the bus bar includes a first bus bar portion and a second bus bar portion that are electrically connected in series.
  • the first bus bar portion is opposed to the second bus bar portion with an interval.
  • the direction in which the current flows through the first bus bar portion is opposite to the direction in which the current flows through the second bus bar portion.
  • At least one of the first bus bar portion and the second bus bar portion is provided with a flow dividing portion including a through hole or a through groove. In at least one of the first bus bar portion and the second bus bar portion, the current flows divided into a plurality of flow paths by the diversion portion.
  • At least one magnetic sensor is disposed between the first bus bar portion and the second bus bar portion.
  • a plurality of flow dividing portions are provided in at least one of the first bus bar portion and the second bus bar portion.
  • the current sensor includes a first magnetic sensor and a second magnetic sensor as magnetic sensors.
  • the bus bar further includes a third bus bar portion electrically connected in series with the second bus bar portion.
  • the third bus bar portion is located on the opposite side of the first bus bar portion across the second bus bar portion, and faces the second bus bar portion with a gap.
  • the direction in which the current flows through the second bus bar portion is opposite to the direction in which the current flows through the third bus bar portion.
  • At least one of the second bus bar portion and the third bus bar portion is provided with a flow dividing portion including a through hole or a through groove. In at least one of the second bus bar portion and the third bus bar portion, the current flows divided into a plurality of flow paths by the diversion portion.
  • 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 third bus bar portion is provided with a flow dividing portion.
  • a current sensor is further provided with the calculation part which calculates the value of the said electric current by calculating the detection value of a 1st magnetic sensor, and the detection value of a 2nd 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 opposite in phase.
  • the calculation unit is a subtractor or a differential amplifier.
  • the current sensor further includes a calculation unit that calculates the value of the current by calculating the detection value of the first magnetic sensor and the detection value of the second magnetic sensor. Regarding the strength of the magnetic field generated by the current flowing through the bus bar, the phase of the detection value of the first magnetic sensor and the phase of the detection value of the second magnetic sensor are in phase.
  • the calculation unit is an adder or a summing amplifier.
  • a large current can be measured with a simple structure.
  • FIG. 3 is a cross-sectional view of the current sensor according to Embodiment 1 of the present invention, and is a view of the current sensor of FIG. 2 as viewed from the direction of arrows VV.
  • FIG. 7 is a graph showing the relationship between the magnetic flux density at point C 2 and the hole diameters ⁇ of the first through hole and the second through hole based on the simulation result of Experimental Example 1.
  • FIG. 11 It is a perspective view which shows the external appearance of the current sensor module which concerns on Embodiment 2 of this invention. It is the side view of the current sensor module which concerns on Embodiment 2 of this invention, and is the figure which looked at the current sensor module of FIG. 11 from the arrow XII direction. It is the side view of the current sensor module which concerns on Embodiment 2 of this invention, and is the figure which looked at the current sensor module of FIG. 11 from the arrow XIII direction. It is the top view of the current sensor module which concerns on Embodiment 2 of this invention, and is the figure which looked at the current sensor module of FIG. 11 from the arrow XIV direction.
  • FIG. 6 is a graph showing the magnetic flux density change rate from point A 1 to point A 3 on the virtual straight line AA ′ in each of the bus bars of Embodiment 1 and Example 5 based on the simulation result of Experimental Example 2.
  • 6 is a graph showing the magnetic flux density change rate from point B 1 to point B 3 on the virtual straight line BB ′ in each of the bus bars of Embodiment 1 and Example 5 based on the simulation result of Experimental Example 2.
  • 10 is a graph showing the change rate of magnetic flux density from point C 1 to point C 3 on the virtual straight line CC ′ in each of the bus bars of Embodiment 1 and Example 5 based on the simulation result of Experimental Example 2.
  • 7 is a graph showing a magnetic flux density change rate from point A 1 to point A 3 on a virtual straight line AA ′ in each of the bus bars of Embodiment 1 and Example 6 based on the simulation result of Experimental Example 2.
  • 7 is a graph showing the magnetic flux density change rate from point B 1 to point B 3 on the virtual straight line BB ′ in each of the bus bars of Embodiment 1 and Example 6 based on the simulation result of Experimental Example 2.
  • 7 is a graph showing a magnetic flux density change rate from point C 1 to point C 3 on a virtual straight line CC ′ in each of the bus bars of Embodiment 1 and Example 6 based on the simulation result of Experimental Example 2.
  • It is a perspective view which shows the external appearance of the bus bar of the current sensor which concerns on Embodiment 5 of this invention. It is a perspective view which shows the external appearance of the current sensor which concerns on Embodiment 6 of this invention.
  • FIG. 37 is a cross-sectional view of the bus bar of the current sensor according to the sixth embodiment of the present invention, and is a view of the bus bar of FIG. 36 viewed from the direction of the arrow XXXVII-XXXVII. It is a circuit diagram which shows the sensor circuit comprised by the two circuit boards in the current sensor which concerns on Embodiment 6 of this invention.
  • FIG. 35 is a cross-sectional view of a current sensor according to Embodiment 6 of the present invention, and is a view of the current sensor of FIG. 34 as viewed from the direction of the arrow on the line XXXIX It is a graph which shows the relationship between the input electric current to a bus bar, and the output voltage of a current sensor based on the simulation result and measurement result of Experimental example 3. It is a perspective view which shows the external appearance of the current sensor which concerns on Embodiment 7 of this invention. It is a perspective view which shows the external appearance of the bus bar of the current sensor which concerns on Embodiment 7 of this invention.
  • FIG. 1 is a perspective view showing an appearance of a current sensor according to Embodiment 1 of the present invention.
  • FIG. 2 is a cross-sectional view of the current sensor according to Embodiment 1 of the present invention, and is a view of the current sensor of FIG. 1 as viewed from the direction of arrows II-II.
  • FIG. 3 is a perspective view showing an appearance of the bus bar of the current sensor according to the first embodiment of the present invention.
  • FIG. 4 is a perspective view showing an appearance of the circuit board of the current sensor according to the first embodiment of the present invention.
  • the current sensor 100 includes a bus bar 110 through which a current to be measured which is a current to be measured flows, and a magnetic field generated by the current to be measured through the bus bar 110. And one magnetic sensor 120 for detecting the height.
  • the bus bar 110 includes a first bus bar portion 111 and a second bus bar portion 112 that are electrically connected in series.
  • the first bus bar portion 111 is opposed to the second bus bar portion 112 with an interval.
  • the bus bar 110 includes a first bus bar portion 111 and a second bus bar portion 112 which are in the form of flat plates and are located in parallel with a space therebetween.
  • Bus bar 110 further includes a connection portion 113 that connects one end of first bus bar portion 111 and one end of second bus bar portion 112.
  • the bus bar 110 includes a flat plate-like current input unit 114 connected to the other end of the first bus bar unit 111 so as to be orthogonal to the first bus bar unit 111, and a second bus bar unit so as to be orthogonal to the second bus bar unit 112.
  • a plate-like current output unit 115 connected to the other end of 112 is further included.
  • the current input unit 114 and the current output unit 115 are located on the same plane and extend in opposite directions.
  • one circular first through hole 111h serving as a diversion portion is provided in the center of the first bus bar portion 111.
  • one circular second through hole 112h serving as a flow dividing portion is provided in the center of the second bus bar portion 112.
  • the diversion part may not be provided in both the first bus bar part 111 and the second bus bar part 112, and may be provided only in one of them.
  • the bus bar 110 is made of copper.
  • the material of the bus bar 110 is not limited to copper, and may be, for example, a metal such as aluminum or silver, or an alloy containing these metals.
  • 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 magnetic sensor 120 is mounted on the printed circuit board 130 together with the operational amplifier 140 and the passive element 150.
  • the magnetic sensor 120 is disposed at the center of the printed circuit board 130.
  • the magnetic sensor 120 has a bridge circuit composed of four magnetoresistive elements.
  • the magnetic sensor 120 is configured to have the first bus bar portion 111. And the second bus bar portion 112. In the present embodiment, the magnetic sensor 120 is disposed between the first through hole 111h and the second through hole 112h.
  • the direction 12 in which the current to be measured flows through the first bus bar portion 111 is opposite to the direction 14 in which the current to be measured flows through the second bus bar portion 112.
  • a direction 11 in which the current to be measured flows through the current input unit 114, a direction 13 in which the current to be measured flows through the connection unit 113, and a direction 15 in which the current to be measured flows through the current output unit 115 are the same.
  • FIG. 5 is a cross-sectional view of the current sensor according to the first embodiment of the present invention, and is a view of the current sensor of FIG. 2 as viewed from the direction of the arrows VV.
  • the current to be measured flowing through the first bus bar portion 111 is divided into two flow paths by the first through hole 111h.
  • the current to be measured flowing through the second bus bar portion 112 is divided into two flow paths by the second through holes 112h.
  • the magnetic fields 111e adjacent to each other cancel each other. Further, at the position of the magnetic sensor 120, the magnetic fields 112e adjacent to each other cancel each other. As a result, the magnetic flux density acting on the magnetic sensor 120 can be reduced. Thereby, even when a large current flows through the bus bar 110, it is possible to suppress the magnetic saturation of the magnetoresistive effect element of the magnetic sensor 120.
  • FIG. 6 is a graph showing the relationship between the magnetic flux density acting on the magnetoresistive effect element and the output voltage of the magnetoresistive effect element.
  • the vertical axis represents the output voltage of the magnetoresistive effect element
  • the horizontal axis represents the magnetic flux density acting on the magnetoresistive effect element.
  • the output voltage of the magnetoresistive effect element increases in proportion to the increase of the magnetic flux density acting on the magnetoresistive effect element. .
  • the output voltage of the magnetoresistive element hardly increases even if the magnetic flux density acting on the magnetoresistive element increases.
  • the magnetic sensor 120 is formed by reducing the magnetic flux density acting on the magnetoresistive element with a simple structure in which the shunt portion is provided in the bus bar 110 without using a complicated circuit. It can be operated in one region T 1 . As a result, the current sensor 100 can accurately measure a large current.
  • the current input unit 114 and the current output unit 115 are drawn in opposite directions, a short circuit of the external circuit connected to the bus bar 110 can be suppressed, and Easy connection.
  • FIG. 7 is a front view showing the external dimensions of the bus bar used in Experimental Example 1.
  • FIG. 8 is a side view showing the external dimensions of the bus bar used in Experimental Example 1. 7 and 8, a virtual straight line AA ′ extending in the X direction through a point C 2 described later, a virtual straight line BB ′ extending in the Z direction through a point C 2 , and the first bus bar
  • An imaginary straight line CC ′ extending in the Y direction through the center of the portion 111 and the center of the second bus bar portion 112 is illustrated.
  • the external dimensions of the bus bar are as follows: width (length in the X direction) 20.0 mm, length (length in the Y direction) 35.0 mm, height (Z The length in the direction) was 28.0 mm.
  • the gap between the first bus bar portion 111 and the second bus bar portion 112 was 5.0 mm.
  • the thickness of the bus bar 110 was 1.0 mm.
  • the material of the bus bar 110 was Cu.
  • the intersection of the virtual straight line CC ′ and the inner surface of the first bus bar portion 111 is C 1 point
  • the intersection of the virtual straight line CC ′ and the second bus bar portion 112 is C 3 point
  • the intermediate point between points C 1 and C 3 on the virtual straight line CC ′ is defined as point C 2 .
  • FIG. 9 shows the relationship between the magnetic flux density distribution from the C 1 point to the C 3 point on the virtual straight line CC ′ and the hole diameters ⁇ of the first and second through holes on the virtual straight line CC ′. It is a graph which shows a relationship.
  • FIG. 10 is a graph showing the relationship between the magnetic flux density at point C 2 and the hole diameters ⁇ of the first and second through holes based on the simulation result of Experimental Example 1.
  • the vertical axis indicates the magnetic flux density
  • the horizontal axis indicates the position on the virtual straight line C-C ′.
  • the vertical axis represents the magnetic flux density
  • the horizontal axis represents the diameters ⁇ of the first and second through holes.
  • FIG. 11 is a perspective view showing an appearance of a current sensor module according to Embodiment 2 of the present invention.
  • 12 is a side view of the current sensor module according to Embodiment 2 of the present invention, and is a view of the current sensor module of FIG. 11 as viewed from the direction of the arrow XII.
  • FIG. 13 is a side view of the current sensor module according to Embodiment 2 of the present invention, and is a view of the current sensor module of FIG. 11 as viewed from the direction of arrow XIII.
  • FIG. 14 is a plan view of the current sensor module according to Embodiment 2 of the present invention, and is a view of the current sensor module of FIG. 11 viewed from the direction of the arrow XIV.
  • the current sensor module 200 includes two current sensors, a printed circuit board 130, an operational amplifier 140, a passive element 150, and an external connection terminal 160. .
  • the two current sensors, the operational amplifier 140, the passive element 150, and the external connection terminal 160 are mounted on the printed board 130.
  • the bus bars 110a and 110b of the two current sensors are fitted in openings provided in the printed circuit board 130.
  • the magnetic sensor 120 of each of the two current sensors is mounted on the printed board 130.
  • the hole diameter ⁇ of the first through hole and the second through hole of the bus bar 110b is larger than the hole diameter ⁇ of the first through hole and the second through hole of the bus bar 110a. Therefore, the current sensor including the bus bar 110b has a wider measurement range than the current sensor including the bus bar 110a.
  • the current sensor module 200 includes the current sensors having different measurement ranges, the measurement sensitivity can be kept high while having a wide measurement range.
  • the number of current sensors included in the current sensor module is not limited to two, but may be plural.
  • the current sensor according to the third embodiment of the present invention which is different from the current sensor according to the first embodiment only in the shape of the through hole of the bus bar serving as the diversion portion, will be described. Note that the description of the same configuration as the current sensor 100 according to the first embodiment will not be repeated.
  • FIG. 15 is a perspective view showing an appearance of a bus bar of a current sensor according to Embodiment 3 of the present invention.
  • FIG. 16 is a front view showing the outer shape of the bus bar of the current sensor according to the third embodiment of the present invention.
  • one rectangular first through hole 111 s serving as a diversion portion is provided in the center of the first bus bar portion 111. ing. In the center of the second bus bar portion 112, one rectangular second through hole serving as a flow dividing portion is provided.
  • the diversion part may not be provided in both the first bus bar part 111 and the second bus bar part 112, and may be provided only in one of them.
  • the longitudinal directions of the first through hole 111s and the second through hole are in the direction in which the current to be measured flows through the first bus bar portion 111 and the direction in which the current to be measured flows through the second bus bar portion 112. Parallel.
  • the longitudinal directions of the first through hole 111s and the second through hole intersect the direction in which the current to be measured flows through the first bus bar portion 111 and the direction in which the current to be measured flows through the second bus bar portion 112. May be.
  • the current to be measured flowing through the first bus bar portion 111 and the second bus bar portion 112 is the same as the current sensor 100 according to the first embodiment.
  • the magnetic flux density acting on the magnetoresistive effect element can be reduced.
  • the shape of the through hole of the bus bar 110c serving as the diversion portion is not limited to a rectangle, and may be any shape that can divert the current to be measured flowing through the first bus bar portion 111 and the second bus bar portion 112.
  • FIG. 17 is a perspective view showing an appearance of a bus bar of a current sensor according to Embodiment 4 of the present invention.
  • FIG. 18 is a front view showing the outer shape of the bus bar of the current sensor according to the fourth embodiment of the present invention.
  • the first bus bar portion 111 is provided with two circular first through holes 111 h serving as a flow dividing portion.
  • the second bus bar portion 112 is provided with two circular second through holes serving as a flow dividing portion.
  • the diversion part may not be provided in both the first bus bar part 111 and the second bus bar part 112, and may be provided only in one of them.
  • each of the first through-hole 111h and the second through-hole is in the direction in which the current to be measured flows through the first bus bar portion 111 and the direction in which the current to be measured flows through the second bus bar portion 112. They are lined up in parallel.
  • the current sensor 100 can be shunted to reduce the magnetic flux density acting on the magnetoresistive effect element. As a result, it is possible to operate the magnetic sensor 120 in the first region T 1, it is possible to accurately measure the large current.
  • the number of through holes provided in each of the first and second bus bar portions 111 and 112 is not limited to two.
  • a current sensor according to a modification of the present embodiment will be described.
  • FIG. 19 is a perspective view showing an appearance of a bus bar of a current sensor according to a modification of Embodiment 4 of the present invention.
  • FIG. 20 is a front view showing an outer shape of a bus bar according to a modification of the fourth embodiment of the present invention.
  • the first bus bar portion 111 is provided with four circular first through holes 111h serving as a flow dividing portion.
  • the second bus bar portion 112 is provided with four circular second through holes serving as a diversion portion.
  • the current according to the fourth embodiment Similar to the sensor, the current to be measured flowing through the first bus bar portion 111 and the second bus bar portion 112 can be shunted to reduce the magnetic flux density acting on the magnetoresistive effect element. As a result, it is possible to operate the magnetic sensor 120 in the first region T 1, it is possible to accurately measure the large current.
  • FIG. 21 is a perspective view showing an appearance of the bus bar of Example 5 used in Experimental Example 2.
  • FIG. 22 is a front view showing the outer dimensions of the bus bar of the fifth embodiment.
  • FIG. 23 is a side view showing the outer dimensions of the bus bar of the fifth embodiment.
  • FIG. 24 is a perspective view showing an appearance of the bus bar of Example 6 used in Experimental Example 2.
  • FIG. 25 is a front view showing the outer dimensions of the bus bar of Example 6.
  • FIG. 26 is a side view showing the outer dimensions of the bus bar of Example 6.
  • the outer dimensions of the bus bar are as follows: width (length in the X direction) 20.0 mm, length (length in the Y direction) 35. The height (length in the Z direction) was 28.0 mm. The gap between the first bus bar portion 111 and the second bus bar portion 112 was 5.0 mm. The thickness of the bus bar 110 was 1.0 mm. The material of the bus bar 110 was Cu.
  • the first bus bar portion 111 has seven rectangular first through holes 111s
  • the second bus bar portion 112 has seven rectangular second through holes. 112s is provided.
  • Each of the first through hole 111s and the second through hole 112s has a length in the short side direction (length in the X direction) of 1.5 mm and a length in the long side direction (length in the Z direction) of 10.0 mm. Yes, they are lined up at intervals in the X direction.
  • the first bus bar portion 111 has 36 circular first through holes 111h
  • the second bus bar portion 112 has 36 circular second holes.
  • a through hole 112h is provided.
  • Each of the first through hole 111h and the second through hole 112h has a hole diameter ⁇ of 2.0 mm and is arranged in a matrix.
  • the intersection of the virtual straight line CC ′ and the inner surface of the first bus bar portion 111 is C 1 point
  • 'position A 1 point -10.0mm from C 2 points in the X direction on the virtual straight line A-A' virtual straight line A-A C 2 points on A position of +10.0 mm in the X direction is defined as A 3 point.
  • FIG. 27 is a graph showing the magnetic flux density change rate from point A 1 to point A 3 on the virtual straight line AA ′ in each of the bus bars of the first embodiment and the fifth embodiment based on the simulation result of the experimental example 2.
  • FIG. 28 is a graph showing the magnetic flux density change rate from point B 1 to point B 3 on the virtual straight line BB ′ in each of the bus bars of Embodiment 1 and Example 5 based on the simulation result of Experimental Example 2.
  • FIG. 29 is a graph showing the magnetic flux density change rate from point C 1 to point C 3 on the virtual straight line CC ′ in each of the bus bars of the first embodiment and the fifth embodiment based on the simulation result of the experimental example 2. It is.
  • FIG. 30 is a graph showing the magnetic flux density change rate from point A 1 to point A 3 on the virtual straight line AA ′ in each of the bus bars of the first embodiment and the sixth embodiment based on the simulation result of the experimental example 2. It is.
  • FIG. 31 is a graph showing the rate of change in magnetic flux density from point B 1 to point B 3 on the virtual straight line BB ′ in each of the bus bars of the first embodiment and the sixth embodiment based on the simulation result of the experimental example 2.
  • FIG. 32 is a graph showing the magnetic flux density change rate from point C 1 to point C 3 on the virtual straight line CC ′ in each of the bus bars of the first embodiment and the sixth embodiment based on the simulation result of the experimental example 2. It is.
  • the magnetic flux density variation rate with respect to the magnetic flux density of the C 2 points on the vertical axis indicates the position on the virtual line A-A 'on the horizontal axis.
  • the magnetic flux density variation rate on the vertical axis with respect to the magnetic flux density of the C 2 points, and the horizontal axis indicates the position on the virtual line B-B '.
  • the magnetic flux density variation rate with respect to the magnetic flux density of the C 2 points on the vertical axis indicates the position on the virtual line C-C 'on the horizontal axis.
  • the distribution of the magnetic flux density change rate of the bus bar of Embodiment 1 is indicated by a dotted line
  • the distribution of the magnetic flux density change rate of the bus bar of Example 5 is indicated by a solid line.
  • the distribution of the magnetic flux density change rate of the bus bar of Embodiment 1 is indicated by a dotted line
  • the distribution of the magnetic flux density change rate of the bus bar of Example 6 is indicated by a solid line.
  • the current sensor according to the fifth embodiment of the present invention which is different from the current sensor according to the first embodiment only in that the flow dividing portion is formed of a through groove, will be described. Note that the description of the same configuration as the current sensor 100 according to the first embodiment will not be repeated.
  • FIG. 33 is a perspective view showing an appearance of a bus bar of a current sensor according to Embodiment 5 of the present invention.
  • the bus bar 210 of the current sensor according to the fifth embodiment of the present invention the first bus bar portion 111, the second bus bar portion 112, and the through hole provided so as to extend to the connection portion 113,
  • One bus bar portion 111 is provided with one first through groove 211n serving as a diversion portion
  • the second bus bar portion 112 is provided with one second through groove 212n serving as a diversion portion.
  • the diversion part may not be provided in both the first bus bar part 111 and the second bus bar part 112, and may be provided only in one of them.
  • the first through groove 211n and the second through groove 212n are parallel to the direction in which the current to be measured flows through the first bus bar portion 111 and the direction in which the current to be measured flows through the second bus bar portion 112. It extends to.
  • the extending direction of the first through groove 211n and the second through groove 212n is 90 with respect to the direction in which the current to be measured flows through the first bus bar portion 111 and the direction in which the current to be measured flows through the second bus bar portion 112. It may intersect at an angle smaller than °.
  • the current to be measured flowing through the first bus bar portion 111 and the second bus bar portion 112 is the same.
  • the magnetic flux density acting on the magnetoresistive effect element can be reduced. As a result, it is possible to operate the magnetic sensor 120 in the first region T 1, it is possible to accurately measure the large current.
  • the shape of the through groove of the bus bar 210 serving as a flow dividing portion is not limited to a linear shape, and may be any shape that can divert the current to be measured flowing through the first bus bar portion 111 and the second bus bar portion 112.
  • FIG. 34 is a perspective view showing an appearance of a current sensor according to Embodiment 6 of the present invention.
  • FIG. 35 is a perspective view showing an appearance of a bus bar of a current sensor according to Embodiment 6 of the present invention.
  • FIG. 36 is a plan view showing the appearance of a bus bar of a current sensor according to Embodiment 6 of the present invention.
  • FIG. 37 is a cross-sectional view of the bus bar of the current sensor according to the sixth embodiment of the present invention, and is a view of the bus bar of FIG. 36 viewed from the direction of the arrow XXXVII-XXXVII.
  • the current sensor 300 includes a bus bar 310 through which a current to be measured that is a current to be measured flows, and a strength of a magnetic field generated by the current to be measured through the bus bar 310.
  • the bus bar 310 includes a first bus bar portion 311, a second bus bar portion 312 and a third bus bar portion 313 which are electrically connected in series.
  • the first bus bar portion 311 is opposed to the second bus bar portion 312 with an interval.
  • the third bus bar portion 313 is located on the opposite side of the first bus bar portion 311 across the second bus bar portion 312 and faces the second bus bar portion 312 with an interval.
  • the bus bar 310 includes a first bus bar portion 311, a second bus bar portion 312, and a third bus bar portion 313 that are parallel to each other and spaced from each other.
  • the bus bar 310 connects the first connection part 314 that connects one end of the first bus bar part 311 and one end of the second bus bar part 312, and the other end of the second bus bar part 312 and the other end of the third bus bar part 313.
  • a second connection part 315 to be connected is further included.
  • the bus bar 310 is located on the same plane as the second bus bar part 312 and is located on the same plane as the flat current input part 317 connected to the other end of the first bus bar part 311 and the second bus bar part 311.
  • a plate-shaped current output unit 319 connected to one end of the third bus bar unit 313 is further included.
  • the current input unit 317 and the current output unit 319 are located on the same plane and extend in opposite directions.
  • the bus bar 310 connects the other end of the first bus bar portion 311 and one end of the current input portion 317, and the one end of the third bus bar portion 313 and the other end of the current output portion 319.
  • a second drawer 318 is further included.
  • one circular first through hole 311h serving as a flow dividing portion is provided in the center of the first bus bar portion 311.
  • one circular second through hole 312 h serving as a flow dividing portion is provided in the center of the second bus bar portion 3112.
  • one circular third through hole 313h serving as a flow dividing portion is provided in the center of the third bus bar portion 313, one circular third through hole 313h serving as a flow dividing portion is provided.
  • all of the first bus bar part 311, the second bus bar part 312 and the third bus bar part 313 may not be provided with a flow dividing part, only the first bus bar part 311 and the third bus bar part 313, or the second A diversion part may be provided only in the bus bar part 312.
  • a diversion part with the through-hole or through-groove of shapes other than circular may comprise a plurality of flow dividing portions.
  • the current input portion 317 is provided with a fourth through hole 317h for connection between the current sensor 300 and an external circuit.
  • the current output unit 319 is provided with a fifth through hole 319h for connection between the current sensor 300 and an external circuit.
  • the bus bar 310 is made of copper.
  • the material of the bus bar 310 is not limited to copper, and may be, for example, a metal such as aluminum or silver, or an alloy containing these metals.
  • a circuit board is inserted between each of the first bus bar portion 311 and the second bus bar portion 312 and between the second bus bar portion 312 and the third bus bar portion 313, and the current sensor. 300 is configured.
  • FIG. 38 is a circuit diagram showing a sensor circuit configured by two circuit boards in the current sensor according to the sixth embodiment of the present invention.
  • FIG. 39 is a cross-sectional view of the current sensor according to Embodiment 6 of the present invention, and is a view of the current sensor of FIG. 34 as viewed from the direction of the arrow on the XXXIX-XXXIX line.
  • the first magnetic sensor 120a is mounted on the first printed circuit board 130a together with the first operational amplifier 140a and the first passive element 150a.
  • the second magnetic sensor 120b is mounted on the second printed circuit board 130b together with the second operational amplifier 140b and the second passive element 150b.
  • Each of the first magnetic sensor 120a and the second magnetic sensor 120b has a bridge circuit including four magnetoresistive elements.
  • the current sensor 300 includes a calculation unit 390 that calculates the value of the current to be measured flowing through the bus bar 310 by calculating the detection value of the first magnetic sensor 120a and the detection value of the second magnetic sensor 120b.
  • Calculation unit 390 is a differential amplifier. However, the calculation unit 390 may be a subtracter.
  • the first magnetic sensor 120a is disposed between the first bus bar portion 311 and the second bus bar portion 312. In the present embodiment, the first magnetic sensor 120a is disposed between the first through hole 311h and the second through hole 312h.
  • the first magnetic sensor 120a has a direction orthogonal to the direction in which the first bus bar portion 311 and the third bus bar portion 313 are aligned, and a direction orthogonal to the direction 33 in which the current to be measured flows through the first bus bar portion 111.
  • the detection axis is in the direction indicated by the arrow 121a in FIG.
  • the second magnetic sensor 120b is disposed between the second bus bar portion 312 and the third bus bar portion 313.
  • the second magnetic sensor 120b is disposed between the second through hole 312h and the third through hole 313h.
  • the second magnetic sensor 120b has a direction orthogonal to the direction in which the first bus bar portion 311 and the third bus bar portion 313 are aligned, and a direction orthogonal to the direction 37 in which the current to be measured flows through the third bus bar portion 313.
  • the detection axis is in the direction indicated by the arrow 121b in FIG.
  • the first magnetic sensor 120a and the second magnetic sensor 120b 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 direction 33 in which the current to be measured flows through the first bus bar portion 311 and the direction 37 in which the current to be measured flows through the third bus bar portion 313 are the same.
  • the direction 33 in which the current to be measured flows in the first bus bar portion 311, the direction 37 in which the current to be measured flows in the third bus bar portion 313, and the direction 35 in which the current to be measured flows in the second bus bar portion 312 are opposite.
  • the direction 31 in which the current to be measured flows through the current input unit 317 and the direction 39 in which the current to be measured flows through the current output unit 319 are the same.
  • the direction 32 in which the current to be measured flows through the first lead portion 316 and the direction 38 in which the current to be measured flows through the second lead portion 318 are the same.
  • the direction 34 in which the current to be measured flows through the first connection portion 314 and the direction 36 in which the current to be measured flows through the second connection portion 315 are the same.
  • the current to be measured flowing through the first bus bar portion 311 is divided into two flow paths by the first through hole 311h.
  • the current to be measured flowing through the second bus bar portion 312 is divided into two flow paths by the second through hole 312h.
  • the current to be measured flowing through the third bus bar portion 313 is divided into two flow paths by the third through hole 313h.
  • a magnetic field 311 e that circulates through each flow path is generated according to the so-called right-handed screw law.
  • a magnetic field 312 e that goes around each flow path is generated.
  • a magnetic field 313e that goes around each flow path is generated.
  • the magnetic fields 311e adjacent to each other cancel each other at the position of the first magnetic sensor 120a. Further, at the position of the first magnetic sensor 120a, the adjacent magnetic fields 312e cancel each other. As a result, the magnetic flux density acting on the first magnetic sensor 120a can be reduced.
  • the magnetic fields 312e adjacent to each other cancel each other at the position of the second magnetic sensor 120b. Further, the magnetic fields 313e adjacent to each other cancel each other at the position of the second magnetic sensor 120b. As a result, the magnetic flux density acting on the second magnetic sensor 120b can be reduced.
  • the magnetoresistive effect elements of the first magnetic sensor 120a and the second magnetic sensor 120b are prevented from being magnetically saturated, and the first magnetic sensor 120a and the second magnetic sensor 120a are suppressed.
  • the sensor 120b can be operated in the first region T 1.
  • the current sensor 300 can accurately measure a large current.
  • the strength of the magnetic field generated by the measured current flowing through the bus bar 310 is The phase of the detection value of the first magnetic sensor 120a is opposite to the phase of the detection value of the second magnetic sensor 120b.
  • the strength of the magnetic field detected by the first magnetic sensor 120a is a positive value
  • the strength of the magnetic field detected by the second magnetic sensor 120b is a negative value.
  • the detection value of the first magnetic sensor 120a and the detection value of the second magnetic sensor 120b are transmitted to the calculation unit 390.
  • the calculation unit 390 subtracts the detection value of the second magnetic sensor 120b from the detection value of the first magnetic sensor 120a. As a result, the absolute value of the detection value of the first magnetic sensor 120a and the absolute value of the detection value of the second magnetic sensor 120b are added. From this addition result, the value of the current to be measured flowing through the bus bar 310 is calculated.
  • the external magnetic field source is physically the first magnetic sensor. It cannot be located between the sensor 120a and the second magnetic sensor 120b.
  • the direction of the magnetic field component in the direction of the detection axis indicated by the arrow 121a and the magnetic field applied from the external magnetic field source to the second magnetic sensor 120b is the same direction. Therefore, if the strength of the external magnetic field detected by the first magnetic sensor 120a is a positive value, the strength of the external magnetic field detected by the second magnetic sensor 120b is also a positive value.
  • the calculation unit 390 subtracts the detection value of the second magnetic sensor 120b from the detection value of the first magnetic sensor 120a, thereby detecting the absolute value of the detection value of the first magnetic sensor 120a and the detection of the second magnetic sensor 120b.
  • the absolute value of the value is subtracted. Thereby, the magnetic field from the external magnetic field source is hardly detected. That is, the influence of the external magnetic field is reduced.
  • the directions of the detection axes with positive detection values may be opposite to each other (opposite 180 °).
  • the strength of the external magnetic field detected by the first magnetic sensor 120a is a positive value
  • the strength of the external magnetic field detected by the second magnetic sensor 120b is a negative value.
  • the phase of the detection value of the first magnetic sensor 120a and the phase of the detection value of the second magnetic sensor 120b are in phase.
  • an adder or an addition amplifier is used as the calculation unit 390 instead of the differential amplifier.
  • the detected value of the first magnetic sensor 120a and the detected value of the second magnetic sensor 120b are added by an adder or an adding amplifier, thereby obtaining the absolute value of the detected value of the first magnetic sensor 120a.
  • the absolute value of the detection value of the second magnetic sensor 120b is subtracted. Thereby, the magnetic field from the external magnetic field source is hardly detected. That is, the influence of the external magnetic field is reduced.
  • the strength of the magnetic field generated by the current to be measured flowing through the bus bar 310 is calculated by adding the detection value of the first magnetic sensor 120a and the detection value of the second magnetic sensor 120b by an adder or an addition amplifier.
  • the absolute value of the detection value of the first magnetic sensor 120a and the absolute value of the detection value of the second magnetic sensor 120b are added. From this addition result, the value of the current to be measured flowing through the bus bar 310 is calculated.
  • an adder or an addition amplifier may be used as the calculation unit in place of the differential amplifier while the input / output characteristics of the first magnetic sensor 120a and the second magnetic sensor 120b have opposite polarities.
  • Example 3 As shown in FIGS. 36 and 37, in Experimental Example 3, the outer dimensions of the bus bar are as follows: width (length in the X direction) 20.0 mm, length (length in the Y direction) 96.0 mm, and height (Z The length in the direction) was 10.0 mm. The gap between the first bus bar portion 311 and the second bus bar portion 312 was 3.5 mm. The gap between the second bus bar portion 312 and the third bus bar portion 313 was 3.5 mm. The thickness of the bus bar 310 was 1.0 mm. The material of the bus bar 110 was Cu.
  • FIG. 40 is a graph showing the relationship between the input current to the bus bar and the output voltage of the current sensor based on the measurement result of Experimental Example 3.
  • the vertical axis represents the output voltage (V) of the current sensor
  • the horizontal axis represents the input current (A) to the bus bar.
  • the change amount of the output voltage of the current sensor with respect to the change amount of the input current to the bus bar is reduced.
  • This acts on the magnetoresistive effect element of each of the first magnetic sensor 120a and the second magnetic sensor 120b by increasing the hole diameters ⁇ of the first through hole 311h, the second through hole 312h, and the third through hole 313h. It shows that the degree of magnetic flux density reduction can be increased.
  • the measurement ranges of the first magnetic sensor 120a and the second magnetic sensor 120b can be expanded.
  • the linearity of the output voltage with respect to the current to be measured within the measurement range is important.
  • the current sensor is required to maintain high sensitivity within the measurement range. Therefore, it is preferable to set the hole diameter ⁇ of the first through hole 311h, the second through hole 312h, and the third through hole 313h to the smallest hole diameter within a range that can be expanded to a necessary measurement range. For example, when the current sensor measurement range is set to ⁇ 100 A, the diameter ⁇ of the first through hole 311 h, the second through hole 312 h, and the third through hole 313 h is set to 3.0 mm, and the current sensor measurement range is set to ⁇ 300 A. In this case, the hole diameter ⁇ of the first through hole 311h, the second through hole 312h, and the third through hole 313h is set to 7.5 mm.
  • FIG. 41 is a perspective view showing an appearance of a current sensor according to Embodiment 7 of the present invention.
  • FIG. 42 is a perspective view showing an appearance of a bus bar of a current sensor according to Embodiment 7 of the present invention.
  • FIG. 43 is a perspective view of the bus bar of the current sensor according to the seventh embodiment of the present invention, and is a view of the bus bar of FIG. 42 as viewed from the direction of the arrow XLIII.
  • 44 is a perspective view of the bus bar of the current sensor according to the seventh embodiment of the present invention, and is a view of the bus bar of FIG. 42 as viewed from the direction of the arrow XLIV.
  • the current sensor 400 includes a bus bar 410 through which a current to be measured that is a current to be measured flows, and a strength of a magnetic field generated by the current to be measured through the bus bar 410.
  • a first magnetic sensor and a second magnetic sensor for detecting the height are shown in FIGS. 41 to 44.
  • the bus bar 410 includes a first bus bar portion 411a, second bus bar portions 412a and 412b, and a third bus bar portion 411b that are electrically connected in series.
  • the first bus bar portion 411a is opposed to the second bus bar portions 412a and 412b with a space therebetween.
  • the third bus bar portion 411b is located on the opposite side of the first bus bar portion 411a across the second bus bar portions 412a and 412b, and is opposed to the second bus bar portions 412a and 412b with a space therebetween.
  • a circuit board is inserted between the first bus bar portion 411a and the second bus bar portions 412a and 412b, and between the second bus bar portions 412a and 412b and the third bus bar portion 411b, so that the current sensor 400 is configured. Has been.
  • the bus bar 410 includes a first bus bar member 410a constituting the first bus bar part 411a and a part 412a of the second bus bar part, and a second bus bar member 410b constituting the part 412b of the second bus bar part and the third bus bar part 411b. Are combined.
  • the first bus bar member 410a includes a first connection part 413a that connects one end of the first bus bar part 411a and one end of a part 412a of the second bus bar part. Further, the first bus bar member 410a is located on the same plane as the part 412a of the second bus bar part, and is connected to the other end of the first bus bar part 411a, and one of the second bus bar parts. A current output part 419a extending from the other end of the part 412a is included. The current input part 417a and the current output part 419a are located on the same plane and extend in opposite directions.
  • the first bus bar member 410a further includes a first lead portion 416a that connects the other end of the first bus bar portion 411a and the current input portion 417a.
  • the second bus bar member 410b includes a second connection part 413b that connects one end of the third bus bar part 411b and one end of a part 412b of the second bus bar part. Further, the second bus bar member 410b is located on the same plane as the part 412b of the second bus bar part, and is connected to the other end of the third bus bar part 411b, and one of the second bus bar parts. A current output part 419b extending from the other end of the part 412b is included. The current input part 417b and the current output part 419b are located on the same plane and extend in opposite directions. Second bus bar member 410b further includes a second lead portion 416b that connects the other end of third bus bar portion 411b and current input portion 417b.
  • one circular first through hole 411ha serving as a flow dividing portion is provided in the center of the first bus bar portion 411a.
  • One circular second through hole 412ha serving as a flow dividing portion is provided at the center of a part 412a of the second bus bar portion.
  • One circular second through hole 412hb serving as a flow dividing portion is provided at the center of a part 412b of the second bus bar portion.
  • one circular third through hole 411hb serving as a flow dividing portion is provided in the center of the third bus bar portion 411b.
  • first bus bar portion 411a, the second bus bar portions 412a, 412b, and the third bus bar portion 411b may not be provided with a diversion portion, only the first bus bar portion 411a and the third bus bar portion 411b, or A diversion part may be provided only in the second bus bar parts 412a and 412b.
  • the current input portions 417a and 417b are provided with fourth through holes 417ha and 417hb for connection between the current sensor 400 and an external circuit.
  • the current output portions 419a and 419b are provided with fifth through holes 419ha and 419hb for connection between the current sensor 400 and an external circuit.
  • the current sensor 400 can accurately measure a large current.
  • FIG. 45 is a perspective view showing an appearance of a current sensor according to Embodiment 8 of the present invention.
  • FIG. 46 is a perspective view showing an appearance of a bus bar of a current sensor according to Embodiment 8 of the present invention.
  • FIG. 47 is a perspective view of the bus bar of the current sensor according to the eighth embodiment of the present invention, and is a view of the bus bar of FIG. 46 as viewed from the direction of the arrow XLVII.
  • 48 is a perspective view of the bus bar of the current sensor according to the eighth embodiment of the present invention, and is a view of the bus bar of FIG. 46 as viewed from the direction of arrow XLVIII.
  • the current sensor 500 includes a bus bar 510 through which a current to be measured that is a current to be measured flows, and a strength of a magnetic field generated by the current to be measured through the bus bar 510.
  • a first magnetic sensor and a second magnetic sensor for detecting the height are shown in FIGS. 45 to 48.
  • the bus bar 510 includes a first bus bar portion 511a, second bus bar portions 512a and 512b, and a third bus bar portion 511b that are electrically connected in series.
  • the first bus bar portion 511a faces the second bus bar portions 512a and 512b with an interval therebetween.
  • the third bus bar portion 511b is located on the opposite side of the first bus bar portion 511a across the second bus bar portions 512a and 512b, and faces the second bus bar portions 512a and 512b with a gap therebetween.
  • a circuit board is inserted between each of the first bus bar portion 511a and the second bus bar portions 512a and 512b and between the second bus bar portions 512a and 512b and the third bus bar portion 511b, thereby forming the current sensor 500. Has been.
  • the bus bar 510 includes a first bus bar member 510a constituting the first bus bar part 511a and a part 512a of the second bus bar part, and a second bus bar member 510b constituting the part 512b of the second bus bar part and the third bus bar part 511b. Are combined.
  • the first bus bar member 510a includes a first connection part 513a that connects one end of the first bus bar part 511a and one end of a part 512a of the second bus bar part. Further, the first bus bar member 510a is positioned on the same plane as the part 512a of the second bus bar part, and is connected to the other end of the first bus bar part 511a and one of the second bus bar parts. A current output part 519a extending from the other end of the part 512a is included. The current input part 517a and the current output part 519a are located on the same plane and extend in opposite directions. The first bus bar member 510a further includes a first lead portion 516a that connects the other end of the first bus bar portion 511a and the current input portion 517a.
  • the first bus bar member 510a is connected to one side end of the first bus bar part 511a and extends toward the part 512a of the second bus bar part, and the other of the first bus bar part 511a. And a second cover portion 511ay connected to the side end and extending toward a part 512a of the second bus bar portion. The part 512a of the second bus bar part is not in contact with the first cover part 511ax and the second cover part 511ay.
  • the second bus bar member 510b includes a second connection part 513b that connects one end of the third bus bar part 511b and one end of a part 512b of the second bus bar part. Further, the second bus bar member 510b is located on the same plane as the part 512b of the second bus bar part, and is connected to the other end of the third bus bar part 511b, and one of the second bus bar parts. Current output portion 519b extending from the other end of portion 512b is included. The current input part 517b and the current output part 519b are located on the same plane and extend in opposite directions. Second bus bar member 510b further includes a second lead portion 516b that connects the other end of third bus bar portion 511b and current input portion 517b.
  • the second bus bar member 510b is connected to one side end of the third bus bar part 511b and extends toward the part 512b of the second bus bar part, and the other of the third bus bar part 511b. And a second cover portion 511by connected to the side end and extending toward a part 512b of the second bus bar portion.
  • the part 512b of the second bus bar part is not in contact with the first cover part 511bx and the second cover part 511by.
  • the first cover portion 511ax and the first cover portion 511bx are connected to each other.
  • the second cover part 511ay and the second cover part 511by are connected to each other.
  • one circular first through hole 511ha serving as a flow dividing portion is provided in the center of the first bus bar portion 511a.
  • One circular second through hole 512ha serving as a flow dividing portion is provided at the center of a part 512a of the second bus bar portion.
  • One circular second through hole 512hb serving as a flow dividing portion is provided at the center of a portion 512b of the second bus bar portion.
  • one circular third through hole 511hb serving as a flow dividing portion is provided in the center of the third bus bar portion 511b.
  • first bus bar portion 511a, the second bus bar portions 512a, 512b, and the third bus bar portion 511b may not be provided with a diversion portion, only the first bus bar portion 511a and the third bus bar portion 511b, or A diversion part may be provided only in the 2nd bus-bar part 512a, 512b. Moreover, you may comprise a diversion part with the through-hole or through-groove of shapes other than circular. Furthermore, a plurality of flow dividing portions may be provided in any of the first bus bar portion 511a, the second bus bar portions 512a and 512b, and the third bus bar portion 511b.
  • the current input portions 517a and 517b are provided with fifth through holes 517ha and 517hb for connection between the current sensor 500 and an external circuit.
  • the current output portions 519a and 519b are provided with fifth through holes 519ha and 519hb for connection between the current sensor 500 and an external circuit.
  • the current sensor 500 can accurately measure a large current.
  • the first magnetic sensor is covered by the first bus bar member 510a.
  • the second magnetic sensor is covered with a second bus bar member 510b.
  • the first magnetic sensor is covered by the first bus bar portion 511a, the part 512a of the second bus bar portion, the first connection portion 513a, the first cover portion 511ax, and the second cover portion 511ay.
  • the second magnetic sensor is covered by the third bus bar portion 511b, a part 512b of the second bus bar portion, the second connection portion 513b, the first cover portion 511bx, and the second cover portion 511by.
  • the high frequency component of the external magnetic field can only penetrate to a depth of about 2 to 3 times the skin depth of the first bus bar member 510a and the second bus bar member 510b due to the skin effect. Therefore, it can suppress that the high frequency component of an external magnetic field reaches the 1st magnetic sensor arrange
  • the thickness dimension of the first bus bar member 510a and the second bus bar member 510b is determined in accordance with the frequency of the high frequency component of the external magnetic field that is assumed.

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

Abstract

L'invention concerne un capteur de courant qui comprend une barre omnibus (110) à travers laquelle circule un courant mesuré et au moins un capteur (120) magnétique destiné à détecter la force du champ magnétique généré par le courant circulant à travers la barre omnibus (110). La barre omnibus (110) comprend une première partie (111) de barre omnibus et une seconde partie (112) de barre omnibus qui sont reliées électriquement en série. La première partie (111) de barre omnibus est en regard de la seconde partie (112) de barre omnibus, un espace étant aménagé entre les deux. La direction dans laquelle le courant circule à travers la première partie (111) de barre omnibus est opposée à la direction dans laquelle le courant circule à travers la seconde partie (112) de barre omnibus. La première partie (111) de barre omnibus, la seconde partie (112) de barre omnibus ou les deux sont dotées d'une partie de shunt qui comprend un trou (111h) traversant ou une rainure traversante. Dans la première partie (111) de barre omnibus, la seconde partie (112) de barre omnibus ou les deux, la circulation du courant ci-dessus est divisée en une pluralité de trajets de circulation par la partie de shunt. Ledit au moins un capteur (120) magnétique est disposé entre la première partie (111) de barre omnibus et la seconde partie (112) de barre omnibus.
PCT/JP2015/051309 2014-01-28 2015-01-20 Capteur de courant WO2015115238A1 (fr)

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WO2017010210A1 (fr) * 2015-07-15 2017-01-19 株式会社村田製作所 Capteur de courant électrique
WO2017061206A1 (fr) * 2015-10-08 2017-04-13 株式会社村田製作所 Capteur de courant et appareil de conversion de puissance le comprenant
WO2017192256A1 (fr) * 2016-05-04 2017-11-09 Safran Electrical & Power Ensemble capteur de courant de barre omnibus
JP6471826B1 (ja) * 2018-10-22 2019-02-20 Tdk株式会社 電流センサ及びこれに用いるバスバーの製造方法
CN112345811A (zh) * 2019-08-07 2021-02-09 英飞凌科技股份有限公司 用于将磁场传感器芯片安装至汇流排的装置和方法

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JP2008216230A (ja) * 2007-03-02 2008-09-18 Koshin Denki Kk 電流センサ
JP2010048809A (ja) * 2008-08-25 2010-03-04 Robert Seuffer Gmbh & Co Kg 電流検出装置

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JP2005043254A (ja) * 2003-07-23 2005-02-17 Uchihashi Estec Co Ltd 導体電流測定方法。
JP2008216230A (ja) * 2007-03-02 2008-09-18 Koshin Denki Kk 電流センサ
JP2010048809A (ja) * 2008-08-25 2010-03-04 Robert Seuffer Gmbh & Co Kg 電流検出装置

Cited By (13)

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Publication number Priority date Publication date Assignee Title
WO2017010210A1 (fr) * 2015-07-15 2017-01-19 株式会社村田製作所 Capteur de courant électrique
US10274524B2 (en) 2015-10-08 2019-04-30 Murata Manufacturing Co., Ltd. Current sensor including a first flow path portion and a second flow path folder and power conversion apparatus including the same
JPWO2017061206A1 (ja) * 2015-10-08 2018-04-26 株式会社村田製作所 電流センサおよびこれを備える電力変換装置
WO2017061206A1 (fr) * 2015-10-08 2017-04-13 株式会社村田製作所 Capteur de courant et appareil de conversion de puissance le comprenant
WO2017192256A1 (fr) * 2016-05-04 2017-11-09 Safran Electrical & Power Ensemble capteur de courant de barre omnibus
CN109073686A (zh) * 2016-05-04 2018-12-21 赛峰电气与电源公司 母线电流传感器组件
JP2019516971A (ja) * 2016-05-04 2019-06-20 サフラン エレクトリカル アンド パワー バスバー電流センサアセンブリ
RU2730412C2 (ru) * 2016-05-04 2020-08-21 Сафран Электрикал Энд Пауэр Узел датчика тока электрической шины
US10782322B2 (en) 2016-05-04 2020-09-22 Safran Electrical & Power Busbar current sensor assembly
CN109073686B (zh) * 2016-05-04 2021-05-28 赛峰电气与电源公司 母线电流传感器组件
JP6471826B1 (ja) * 2018-10-22 2019-02-20 Tdk株式会社 電流センサ及びこれに用いるバスバーの製造方法
JP2020067305A (ja) * 2018-10-22 2020-04-30 Tdk株式会社 電流センサ及びこれに用いるバスバーの製造方法
CN112345811A (zh) * 2019-08-07 2021-02-09 英飞凌科技股份有限公司 用于将磁场传感器芯片安装至汇流排的装置和方法

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