WO2013161496A1 - Capteur de courant - Google Patents

Capteur de courant Download PDF

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Publication number
WO2013161496A1
WO2013161496A1 PCT/JP2013/059094 JP2013059094W WO2013161496A1 WO 2013161496 A1 WO2013161496 A1 WO 2013161496A1 JP 2013059094 W JP2013059094 W JP 2013059094W WO 2013161496 A1 WO2013161496 A1 WO 2013161496A1
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WO
WIPO (PCT)
Prior art keywords
conversion element
magnetoelectric conversion
magnetic field
magnetoelectric
current path
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PCT/JP2013/059094
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English (en)
Japanese (ja)
Inventor
蛇口　広行
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アルプス・グリーンデバイス株式会社
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Publication of WO2013161496A1 publication Critical patent/WO2013161496A1/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 that detects a current to be measured flowing in a current path, and more particularly to a current sensor that detects magnetism of an induced magnetic field generated by a current flowing in a current path.
  • a current sensor that detects a measured current flowing in a current path (wire) is well known for controlling and monitoring various devices.
  • a current using a magnetic core that surrounds the current path and focuses the magnetic flux generated around the current path, and a magnetoelectric transducer that detects magnetism generated when current flows in the current path Sensors are well known.
  • FIG. 18 is a diagram schematically showing a configuration of a current detector 900 in the conventional example of Patent Document 1.
  • a current detector 900 shown in FIG. 18 includes a parasitic capacitance adjustment unit 910 provided on the mounting wiring board 909, and the parasitic capacitance adjustment unit 910 causes a connection between the conductor 902 and the wiring unit 940 wired on the mounting wiring board 909. It is said that malfunction of the circuit can be suppressed by setting the value of the parasitic capacitance (stray capacitance) to the same value.
  • the present invention solves the above-described problems, and an object of the present invention is to provide a current sensor capable of measuring a current value with high accuracy by reducing the influence of noise.
  • a current sensor for detecting a current path through which a current to be measured flows and a magnetic field of an induced magnetic field generated by a current flowing through the current path.
  • Surrounding the magnetic core provided with the first gap and the second gap, the first magnetoelectric conversion element provided in the first gap of the magnetic core, and the magnetic core A second magnetoelectric conversion element provided in the second gap, and an arithmetic device for calculating a difference in output between the first magnetoelectric conversion element and the second magnetoelectric conversion element, The angle formed by the direction of the first magnetic field applied to the magnetoelectric conversion element and the first magnetosensitive direction detected by the first magnetoelectric conversion element, and the induction magnetic field applied to the second magnetoelectric conversion element.
  • the direction of the second magnetic field and the second magnetoelectric transducer detect The angle formed by the two magnetic sensing directions is different, and the total capacitance between the current path and the first magnetoelectric transducer, and between the current path and the second magnetoelectric trans
  • the current sensor of the present invention is different in the angle formed between the direction of the first magnetic field and the first magnetosensitive direction and the angle formed between the direction of the second magnetic field and the second magnetosensitive direction. Since the total capacitance between the path and the first magnetoelectric conversion element is equal to the total capacitance between the current path and the second magnetoelectric conversion element, it is detected by the two magnetoelectric conversion elements. When the difference between different output values is calculated by the calculation device, the influence of noise caused by the capacitance can be accurately subtracted. As a result, the influence of noise entering at the same timing can be reduced, and only the signal can be accurately detected. Therefore, it is possible to provide a current sensor that can measure a current value with high accuracy.
  • the current sensor of the present invention is characterized in that a dielectric is provided between the current path and the magnetic core.
  • this dielectric since the dielectric is provided between the current path and the magnetic core, this dielectric allows the total capacitance between the current path and the first magnetoelectric transducer, the current path and the first The total capacitance between the two magnetoelectric conversion elements can be easily made equal, and the total capacitance of each can be made more equal. For this reason, when the difference between the different output values detected by the two magnetoelectric conversion elements is calculated by the calculation device, it is possible to subtract the influence of noise caused by the capacitance more accurately. As a result, the influence of noise that enters at the same timing can be further reduced, and only the signal can be detected more accurately.
  • the direction of the first magnetic field and the first magnetosensitive direction are parallel, and the direction of the second magnetic field and the second magnetosensitive direction are parallel. Yes.
  • the first magnetic field direction and the first magnetosensitive direction are parallel, and the second magnetic field direction and the second magnetosensitive direction are parallel.
  • the induced magnetic fields received by the first and second magnetoelectric conversion elements are the same, and the external magnetic fields received by the first and second magnetoelectric conversion elements at different angles are different.
  • the influence of the external magnetic field can be calculated and canceled, and the influence from the external magnetic field can be easily reduced.
  • the current sensor of the present invention is characterized in that the direction of the first magnetic field is opposite to the direction of the second magnetic field.
  • the output value of one of the magnetoelectric transducers Becomes a positive value and the output value of the other magnetoelectric conversion element becomes a negative value, so that the maximum difference value between the output value of the first magnetoelectric conversion element and the output value of the second magnetoelectric conversion element is obtained.
  • the sensitivity of the current sensor can be increased by calculating the difference value between the outputs of the first and second magnetoelectric transducers with the computing device.
  • the current sensor of the present invention is characterized in that the direction of the first magnetic field and the first magnetosensitive direction are parallel, and the direction of the second magnetic field and the second magnetosensitive direction are orthogonal to each other. .
  • the magnetoelectric transducer since the direction of the first magnetic field and the first magnetosensitive direction are parallel to each other and the direction of the second magnetic field and the second magnetosensitive direction are orthogonal to each other, The magnetoelectric transducer no longer feels the magnetic field in the direction of the second magnetic field, but only the external magnetic field. Thus, the influence of the external magnetic field can be easily reduced by comparing the first magnetoelectric conversion element and the second magnetoelectric conversion element.
  • the current sensor of the present invention is a current sensor for detecting a current path through which a current to be measured flows and a magnetic field of an induced magnetic field generated by the current flowing through the current path, and surrounds the current path and is provided with a gap.
  • the angle formed by the first magnetosensitive direction detected by the conversion element, the direction of the magnetic field that is the induction magnetic field applied to the second magnetoelectric conversion element, and the second magnetosensitive direction detected by the second magnetoelectric conversion element The angle between the current path and the front And the capacitance of the overall between the first magneto-electric transducer, is characterized
  • the angle formed between the direction of the first magnetic field and the first magnetosensitive direction is different from the angle formed between the direction of the second magnetic field and the second magnetosensitive direction.
  • the output values detected by the two magnetoelectric conversion elements are different, and the difference between the output values detected by the two magnetoelectric conversion elements can be calculated by an arithmetic device and compared.
  • the total capacitance between the current path and the first magnetoelectric conversion element is equal to the total capacitance between the current path and the second magnetoelectric conversion element. It is possible to accurately cancel the influence of noise. As a result, the influence of noise entering at the same timing can be reduced, and only the signal can be accurately detected. Therefore, it is possible to provide a current sensor that can measure a current value with high accuracy.
  • the first magnetoelectric conversion element and the second magnetoelectric conversion element are disposed in the thickness direction of the magnetic core and are equidistant from the current path. It is characterized by being arranged side by side.
  • the current sensor of the present invention is arranged side by side so that the first magnetoelectric transducer and the second magnetoelectric transducer arranged in the thickness direction of the magnetic core are equidistant from the current path. Therefore, the total capacitance between the current path and the first magnetoelectric conversion element and the total capacitance between the current path and the second magnetoelectric conversion element can be made more equal. it can. For this reason, when the difference between the different output values detected by the two magnetoelectric conversion elements is calculated by the calculation device, it is possible to subtract the influence of noise caused by the capacitance more accurately. As a result, the influence of noise that enters at the same timing can be further reduced, and only the signal can be detected more accurately.
  • the current sensor of the present invention is characterized in that the direction of the magnetic field and the first magnetic sensing direction are parallel, and the direction of the magnetic field and the second magnetic sensing direction are parallel.
  • the current sensor of the present invention since the direction of the magnetic field and the first magnetosensitive direction are parallel and the direction of the magnetic field and the second magnetosensitive direction are parallel, the current sensor of the present invention has the first magnetoelectric conversion element.
  • the induced magnetic fields received by the second and second magnetoelectric conversion elements are the same, and the external magnetic fields received by the first and second magnetoelectric conversion elements at different angles are different.
  • the influence of the external magnetic field can be calculated and canceled, and the influence from the external magnetic field can be easily reduced.
  • the distance and the facing area between the current path and the first magnetoelectric conversion element and the distance and the facing area between the current path and the second magnetoelectric conversion element are equal.
  • the distance and the facing area between the magnetic core and the first magnetoelectric conversion element are equal to the distance and the facing area between the magnetic core and the second magnetoelectric conversion element.
  • the distance between the current path, the first magnetoelectric conversion element, and the second magnetoelectric conversion element and the facing area are equal, and the magnetic core, the first magnetoelectric conversion element, and the first magnetoelectric conversion element Since the distance and the facing area between the two magnetoelectric conversion elements are equal, the capacitances of the respective magnetoelectric conversion elements and current paths, and the respective magnetoelectric conversion elements and the magnetic core are equal. As a result, it is easy to make the total capacitance of each magnetoelectric conversion element equal when manufacturing a current sensor, and the influence of noise caused by electrostatic coupling can be further reduced. .
  • the angle formed by the direction of the first magnetic field and the first magnetic sensing direction is different from the angle formed by the direction of the second magnetic field and the second magnetic sensitive direction. Since the total capacitance between the magnetoelectric transducers and the total capacitance between the current path and the second magnetoelectric transducer are equal, different output values detected by the two magnetoelectric transducers When the difference is calculated by the calculation device, the influence of noise caused by the capacitance can be accurately subtracted. As a result, the influence of noise entering at the same timing can be reduced, and only the signal can be accurately detected.
  • FIG. 2A and 2B are diagrams illustrating the current sensor according to the first embodiment of the present invention, in which FIG. 2A is a side view seen from the X1 side shown in FIG. 1, and FIG. 2B is a side view seen from the X2 side shown in FIG.
  • FIG. 2C is a top view seen from the Z1 side shown in FIG.
  • FIG. 6A is a front view seen from the Y2 side shown in FIG. 5 and FIG. 6B is a side view seen from the X1 side shown in FIG.
  • FIG. 6C is a top view seen from the Z1 side shown in FIG.
  • It is the schematic diagram which showed the direction of the induction magnetic field in the current sensor of 2nd Embodiment of this invention, and the magnetosensitive direction of a magnetoelectric conversion element.
  • FIG. 6A is a front view seen from the Y2 side shown in FIG. 5
  • FIG. 6B is a side view seen from the X1 side shown in FIG.
  • FIG. 6C is a top view seen from the Z1 side shown in FIG.
  • It is the schematic diagram which showed the direction of the induction magnetic field in the current
  • FIG. 10A is a front view seen from the Y2 side shown in FIG. 9 and FIG. 10B is a side view seen from the X1 side shown in FIG.
  • FIG. 10C is a top view seen from the Z1 side shown in FIG.
  • It is the schematic diagram which showed the electrostatic capacitance in the current sensor of 3rd Embodiment of this invention. It is the schematic diagram which showed the direction of the induction magnetic field in the current sensor of 3rd Embodiment of this invention, and the magnetosensitive direction of a magnetoelectric conversion element.
  • FIG. 13A is a diagram illustrating a modification of the current sensor according to the first embodiment of the present invention
  • FIG. 13A is a modification 1 in which the arrangement position of the magnetoelectric conversion element is changed
  • FIG. 13B is a diagram of the magnetoelectric conversion element; It is the modification 2 which changed the arrangement position.
  • FIG. 14A is a schematic diagram illustrating a modification of the current sensor according to the first embodiment and the second embodiment of the present invention, and FIG. 14A is a modification 3 in which the arrangement position of the magnetoelectric conversion element according to the first embodiment is changed.
  • FIG. 14B is the modification 4 which changed the arrangement position of the magnetoelectric conversion element of 2nd Embodiment. It is a figure explaining the modification of the current sensor of 1st Embodiment of this invention, and 2nd Embodiment, Comprising:
  • FIG. 15A is the modification 5 which changed the electric current path and magnetic body core of 1st Embodiment, FIG.
  • FIG. 15B is a sixth modification in which the current path and the magnetic core of the second embodiment are changed. It is a figure explaining the modification of the current sensor of 2nd Embodiment of this invention, Comprising: It is the current sensor of the modification 9 which changed the arrangement position of the magnetoelectric conversion element.
  • FIG. 17A is a diagram illustrating a modification of the current sensor according to the third embodiment of the present invention, and FIG. 17A is a modification 10 in which the arrangement position of the magnetoelectric transducer according to the third embodiment is changed, and FIG. This is a modified example 11 in which the arrangement position of the third embodiment is changed. It is the figure which showed schematically the structure of the current detector in the prior art example of patent document 1.
  • FIG. 17A is a diagram illustrating a modification of the current sensor according to the third embodiment of the present invention
  • FIG. 17A is a modification 10 in which the arrangement position of the magnetoelectric transducer according to the third embodiment is changed
  • FIG. This is a modified example 11 in which the arrangement position
  • FIG. 1 is a perspective view illustrating a current sensor 101 according to the first embodiment of the present invention.
  • 2A and 2B are diagrams for explaining the current sensor 101 according to the first embodiment of the present invention.
  • FIG. 2A is a side view seen from the X1 side shown in FIG. 1
  • FIG. 2B is a diagram showing X2 shown in FIG. 2C is a side view seen from the side
  • FIG. 2C is a top view seen from the Z1 side shown in FIG.
  • FIG. 3 is a schematic diagram showing capacitance in the current sensor according to the first embodiment of the present invention.
  • FIG. 4 is a schematic diagram showing the direction of the induced magnetic field and the magnetosensitive direction of the magnetoelectric transducer 13 in the current sensor according to the first embodiment of the present invention.
  • the current sensor 101 includes a current path CB through which a current to be measured flows and a magnetic body disposed at a position surrounding the current path CB in a circular ring shape.
  • Core 11 two magnetoelectric conversion elements 13 (first magnetoelectric conversion element 13 ⁇ / b> A and second magnetoelectric conversion element 13 ⁇ / b> B) that detect magnetism of an induced magnetic field generated by a current flowing in current path CB, and a first magnetoelectric conversion
  • an arithmetic unit 17 that calculates a difference in output between the element 13A and the second magnetoelectric transducer 13B.
  • the dielectric 14 (the first dielectric 14A and the second dielectric 14B) provided between the current path CB and the magnetic core 11, the first magnetoelectric conversion element 13A, the second magnetoelectric The board
  • substrate 9 which mounts the conversion element 13B and the arithmetic unit 17 is provided.
  • the substrate 9 is provided with a wiring pattern (not shown) for transmitting output values from the first magnetoelectric conversion element 13A and the second magnetoelectric conversion element 13B to the arithmetic unit 17.
  • the magnetic core 11 is made of a soft magnetic material, such as permalloy (Fe—Ni alloy), and is formed in a circular ring shape as shown in FIGS. 1 and 2.
  • the first gap K11 is provided, and the second gap K12 is provided on the side facing the first gap K11 and the current path CB.
  • the magnetic body core 11 is arrange
  • the current path CB and the magnetic core 11 are fixed by using a dielectric 14 described later, or by holding the current path CB on the magnetic core 11 using a holding member or the like (not shown). Can be easily achieved.
  • the first gap K11 and the second gap K12 are formed in the same size and shape, and the first gap K11 and the second gap K12 are connected to the current path CB.
  • the current path CB is arranged so as to be symmetric with respect to the central axis Aj.
  • the magnetic core 11 is formed in a circular ring shape, but the opposing surfaces forming the first gap K11 or the second gap K12 are formed so as to be parallel, A magnetic field (first magnetic field direction M11 or second magnetic field direction M12 described later) in the first gap K11 or the second gap K12 is a parallel magnetic field.
  • permalloy Fe—Ni alloy
  • Amorphous magnetic alloy, oxide ferrite, etc. may be used.
  • the magnetoelectric conversion element 13 is a current sensor that detects magnetism generated when a current flows through the current path CB.
  • the magnetoelectric conversion element 13 is a magnetoresistive element (GMR (Giant Magneto Resistive) element using a giant magnetoresistive effect).
  • GMR Magnetoresistive element
  • an antiferromagnetic layer is formed of an ⁇ -Fe 2 O 3 layer
  • a pinned layer is formed of a NiFe layer
  • an intermediate layer is formed of a Cu layer
  • a free layer is formed of a NiFe layer.
  • a GMR element is produced on a silicon substrate, and the cut GMR chip is packaged with a thermosetting synthetic resin. As shown in FIGS.
  • the magnetoelectric conversion element 13 includes two magnetoelectric conversion elements 13, that is, a first magnetoelectric conversion element 13A and a second magnetoelectric conversion element 13B. Note that the first magnetoelectric conversion element 13A and the second magnetoelectric conversion element 13B have the same outer shape (packaging size).
  • first magnetoelectric conversion element 13A and the second magnetoelectric conversion element 13B are mounted on a substrate 9 such as a printed circuit board (PCB) as shown in FIG. 1 and FIG.
  • the first magnetoelectric conversion element 13A is disposed in the gap K11, and the second magnetoelectric conversion element 13B is disposed in the second gap K12.
  • C1 C 13 + C 31 ⁇ C 11 / (C 31 + C 11) + C 32 ⁇ C 12 / (C 32 + C 12)
  • the capacitance between the second magneto-electric conversion element 13B and the magnetic core 11 is generated as C 21 and C 22, the capacitance between the second magneto-electric conversion element 13B and the current path CB There occurs as C 23, as a result, the electrostatic capacity C2 of the total between the current paths CB and the second electromagnetic element 13B is as follows.
  • C2 C 23 + C 31 ⁇ C 21 / (C 31 + C 21) + C 32 ⁇ C 22 / (C 32 + C 22)
  • the magnetic sensing direction detected by the first magnetoelectric conversion element 13A is arranged to be the first magnetic sensing direction S11, and the sensitivity detected by the second magnetoelectric conversion element 13B. It arrange
  • the magnetosensitive direction here indicates a direction in which the value detected by the magnetoelectric transducer 13 is positive.
  • the direction of the induced magnetic field in the first gap K11 in which the first magnetoelectric conversion element 13A is disposed is the first magnetic field direction M11, and the second magnetoelectric conversion element 13B.
  • the direction of the induced magnetic field in the second gap K12 in which is disposed is the second magnetic field direction M12.
  • the angle formed by the first magnetic direction S11 detected by the first magnetoelectric conversion element 13A and the direction M11 of the first magnetic field of the induced magnetic field applied to the first magnetoelectric conversion element 13A that is, 0 °
  • the angle formed by the second magnetic direction S12 detected by the second magnetoelectric conversion element 13B and the direction M12 of the second magnetic field of the induced magnetic field applied to the magnetoelectric conversion element 13B that is, 180 °.
  • the calculation device 17 calculates the difference between the output values detected by the two magnetoelectric conversion elements 13 (13A, 13B). Can be compared.
  • the total capacitance C1 between the current path CB and the first magnetoelectric conversion element 13A and the total capacitance between the current path CB and the second magnetoelectric conversion element 13B is adjusted to be equal.
  • the electrostatic capacitance added to each magnetoelectric conversion element 13 (13A, 13B) can be accurately subtracted.
  • the influence of noise entering at the same timing can be reduced, and only the signal can be accurately detected.
  • two dielectrics 14, that is, the first dielectric 14 ⁇ / b> A and the second dielectric are provided between the current path CB and the magnetic core 11.
  • the dielectric 14B is provided.
  • the dielectric constant and size of the dielectric 14 the first dielectric 14A and the second dielectric 14B
  • the total current between the current path CB and the first magnetoelectric transducer 13A is changed.
  • the above-described adjustment to make the capacitance C1 equal to the total capacitance C2 between the current path CB and the second magnetoelectric transducer 13B can be easily performed, and the respective total capacitance (C1 and C2). ) Can be made more equal.
  • the material of the dielectric 14 is not limited, and may be a synthetic resin or an oxide, and may be a metal if it is non-magnetic. Further, as shown in FIG. 2C, the thicknesses of the two dielectrics 14 (the first dielectric 14A and the second dielectric 14B) are made the same and press-fitted between the current path CB and the magnetic core 11. In this arrangement, the dielectric 14 fixes the current path CB and plays a role of positioning the current path CB at the center of the magnetic core 11, and consequently the current path CB and the two magnetoelectric transducers 13 (13 ⁇ / b> A, 13 ⁇ / b> B). ) Is the same distance from each other. Further, in the adjustment described above, it is also performed by slightly moving the arrangement position of the dielectric 14.
  • the first magnetic field direction M11 and the first magnetic sensing direction S11 are parallel, and the second magnetic field direction M12 and the second magnetic sensitive direction S12. Are arranged in parallel to the first gap K11 and the second gap K12, the first magnetoelectric conversion element 13A and the second magnetoelectric conversion element 13B.
  • the induction magnetic fields received by the first magnetoelectric conversion element 13A and the second magnetoelectric conversion element 13B are the same, and the first magnetoelectric conversion element 13A and the second magnetoelectric conversion element 13B are at different angles.
  • the external magnetic field received by each will be different.
  • the influence of the external magnetic field can be canceled and the influence from the external magnetic field can be easily reduced.
  • the first gap K11 and the second gap so that the first magnetic field direction M11 and the second magnetic field direction M12 are opposite to each other.
  • K12 is provided in the magnetic core 11.
  • the first magnetoelectric conversion element 13A and the second magnetoelectric conversion element 13B are arranged, and a first feeling parallel to the first magnetic field direction M11 is provided.
  • the magnetic direction S11 and the second magnetic sensing direction S12 parallel to the second magnetic field direction M12 are opposite to each other. As a result, the output value of one magnetoelectric conversion element 13 becomes a positive value and the output value of the other magnetoelectric conversion element 13 becomes a negative value.
  • the output value of the first magnetoelectric conversion element 13A and the second magnetoelectric conversion element The maximum difference value with the output value of 13B is obtained.
  • the sensitivity of the current sensor 101 can be increased by calculating the difference value between the outputs of the first magnetoelectric conversion element 13A and the second magnetoelectric conversion element 13B by the calculation device 17.
  • the arithmetic device 17 described above is mounted on the substrate 9 and is not shown in detail, the first magnetoelectric conversion element 13A, the second magnetoelectric conversion element 13B, and the electric Are connected, and a difference between outputs of the first magnetoelectric conversion element 13A and the second magnetoelectric conversion element 13B is calculated.
  • the arithmetic unit 17 includes a semiconductor integrated circuit (IC: IC) for processing and calculating electrical signals from the first magnetoelectric conversion element 13A and the second magnetoelectric conversion element 13B. Integrated Circuit).
  • the arithmetic device 17 is mounted on the substrate 9 on which the first magnetoelectric conversion element 13A and the second magnetoelectric conversion element 13B are mounted. However, the arithmetic device 17 is mounted on another substrate or another electronic device, May be connected.
  • the first magnetoelectric conversion element is formed in the first gap K11 and the second gap K12 formed in the same size and shape. Since the 13A and the second magnetoelectric conversion element 13B are arranged so as to be positioned at the center of each gap, the distance between the magnetic core 11 and the first and second magnetoelectric conversion elements 13A and 13B is Are equal. Also, since the first magnetoelectric conversion element 13A and the second magnetoelectric conversion element 13B are formed with the same outer shape (packaging size), the magnetic core 11, the first magnetoelectric conversion element 13A, and the second magnetoelectric conversion The facing area with the element 13B is equal. As a result, the capacitances C 11 and C 21 , and C 12 and C 22 shown in FIG. 3 are equivalent.
  • the first magnetoelectric conversion element 13A and the second magnetoelectric conversion element 13B are disposed so as to be symmetric with respect to the central axis Aj of the current path CB. Therefore, the distance between the current path CB and the first and second magnetoelectric conversion elements 13A and 13B is equal. Further, since the first magnetoelectric conversion element 13A and the second magnetoelectric conversion element 13B are formed with the same outer shape (packaging size), the current path CB, the first magnetoelectric conversion element 13A, and the second magnetoelectric conversion element The facing area with 13B is equal. As a result, the capacitances C 13 and C 23 shown in FIG. 3 become equivalent.
  • each of the magnetoelectric conversion elements 13 becomes more equal. Therefore, when the current sensor 101 is manufactured, each of the magnetoelectric conversion elements 13 (13A, It is easy to make the total capacitance (C1, C2) of 13B) more equal.
  • the current sensor 101 of the present invention has the angle formed by the first magnetic field direction M11 and the first magnetic sensing direction S11 and the angle formed by the second magnetic field direction M12 and the second magnetic sensing direction S12. Unlikely, the total capacitance C1 between the current path CB and the first magnetoelectric conversion element 13A and the total capacitance C2 between the current path CB and the second magnetoelectric conversion element 13B are equal.
  • the difference between different output values detected by the two magnetoelectric conversion elements 13 (13A, 13B) is calculated by the calculation device 17, the influence of noise caused by electrostatic coupling can be accurately subtracted. As a result, the influence of noise entering at the same timing can be reduced, and only the signal can be accurately detected. Therefore, it is possible to provide the current sensor 101 that can measure the current value with high accuracy.
  • the dielectric 14 (the first dielectric 14A and the second dielectric 14B) is provided between the current path CB and the magnetic core 11, the dielectric 14 (the first dielectric 14A and the second dielectric 14B) is provided.
  • the dielectric constant and size of the dielectric 14B By changing the dielectric constant and size of the dielectric 14B), the total capacitance C1 between the current path CB and the first magnetoelectric conversion element 13A, and the current path CB and the second magnetoelectric conversion element 13B.
  • the above-described adjustment can be facilitated to make the total electrostatic capacity C2 between and equal to each other, and the total electrostatic capacity (C1 and C2) can be made more equal.
  • the first magnetoelectric transducer 13A and The induction magnetic fields received by the second magnetoelectric conversion element 13B are the same, and the external magnetic fields received by the first magnetoelectric conversion element 13A and the second magnetoelectric conversion element 13B at different angles are different. Accordingly, by comparing the first magnetoelectric conversion element 13A and the second magnetoelectric conversion element 13B, the influence of the external magnetic field can be calculated and canceled, and the influence from the external magnetic field can be easily reduced. . Therefore, it is possible to provide the current sensor 101 that can measure the current value with high accuracy.
  • the first magnetic sensing direction S11 parallel to the first magnetic field direction M11 and the second magnetic field direction M12 parallel to the first magnetic field direction M12.
  • the two magnetic sensing directions S12 are opposite to each other.
  • the output value of one magnetoelectric conversion element 13 becomes a positive value and the output value of the other magnetoelectric conversion element 13 becomes a negative value
  • the output value of the first magnetoelectric conversion element 13A and the second magnetoelectric conversion element The maximum difference value with the output value of 13B is obtained.
  • the sensitivity of the current sensor 101 can be increased by calculating the difference value between the outputs of the first magnetoelectric conversion element 13A and the second magnetoelectric conversion element 13B by the calculation device 17.
  • the distance and the facing area between the current path CB and the first and second magnetoelectric conversion elements 13A and 13B are equal, and the magnetic core 11, the first and second magnetoelectric conversion elements 13A and 13B, and the second magnetoelectric conversion element. Since the distance to 13B and the facing area are equal, the capacitances of the respective magnetoelectric conversion elements 13 (13A, 13B) and the current path CB, the respective magnetoelectric conversion elements 13 (13A, 13B), and the magnetic core 11 are equivalent. become. As a result, it is easy to make the total capacitance (C1, C2) of the respective magnetoelectric conversion elements 13 (13A, 13B) more equal, and the influence of noise due to electrostatic coupling is further reduced. be able to.
  • FIG. 5 is a perspective view illustrating the current sensor 102 according to the second embodiment of the present invention.
  • 6A and 6B are diagrams illustrating the current sensor 102 according to the second embodiment of the present invention.
  • FIG. 6A is a front view seen from the Y2 side shown in FIG. 5, and
  • FIG. 6B is X1 shown in FIG. 6C is a side view seen from the side, and
  • FIG. 6C is a top view seen from the Z1 side shown in FIG.
  • FIG. 7 is a schematic diagram showing capacitance in the current sensor according to the second embodiment of the present invention.
  • FIG. 8 is a schematic diagram showing the direction of the induced magnetic field and the magnetosensitive direction of the magnetoelectric transducer 23 in the current sensor according to the second embodiment of the present invention.
  • the current sensor 102 of the second embodiment is mainly different from the first embodiment in the arrangement position of the magnetoelectric conversion element 23.
  • symbol is attached
  • the current sensor 102 includes a current path CB through which a current to be measured flows and a magnetic body disposed at a position surrounding the current path CB with a hollow rectangle.
  • the core 21 two magnetoelectric conversion elements 23 (first magnetoelectric conversion element 23A and second magnetoelectric conversion element 23B) for detecting the magnetism of the induced magnetic field generated by the current flowing in the current path CB, and the first magnetoelectric conversion And an arithmetic unit 17 that calculates a difference in output between the element 23A and the second magnetoelectric conversion element 23B.
  • the dielectric 24 (the first dielectric 24A and the second dielectric 24B) provided between the current path CB and the magnetic core 21, the first magnetoelectric transducer 23A, the second magnetoelectric The board
  • substrate 9 which mounts the conversion element 23B and the arithmetic unit 17 is provided.
  • the substrate 9 is provided with a wiring pattern (not shown) for transmitting output values from the first magnetoelectric conversion element 23A and the second magnetoelectric conversion element 23B to the arithmetic unit 17.
  • the magnetic core 21 is made of a soft magnetic material, such as Sendust (Fe—Si—Al alloy), and is formed into a hollow rectangle as shown in FIGS. 5 and 6, and the magnetic core 21 has one side thereof.
  • the first gap K21 and the second gap K22 are provided on the other side.
  • the magnetic body core 21 is arrange
  • the first gap K21 and the second gap K22 are formed in the same size and shape, and the first gap K21 and the second gap K22 are 90 ° with respect to the central axis Aj of the current path CB.
  • the current path CB is arranged so as to be equidistant.
  • the current path CB is easily disposed and fixed by using the dielectric 14 described later or by holding the current path CB on the magnetic core 11 using a holding member or the like (not shown). it can.
  • Sendust Fe—Si—Al alloy
  • Fe—Si—Al alloy any soft magnetic material may be used.
  • Other ferrous materials such as permalloy (Fe—Ni alloy), silicon steel, etc. Amorphous magnetic alloy, oxide ferrite, etc. may be used.
  • the magnetoelectric conversion element 23 is a current sensor for detecting magnetism generated when a current flows in the current path CB.
  • a magnetoresistive element GMR (Giant Magneto Resistive) element using a giant magnetoresistive effect) Say.
  • GMR element for example, an antiferromagnetic layer is formed of an ⁇ -Fe 2 O 3 layer, a pinned layer is formed of a NiFe layer, an intermediate layer is formed of a Cu layer, and a free layer is formed of a NiFe layer.
  • a GMR element is produced on a silicon substrate, and the cut out GMR chip is packaged with a thermosetting synthetic resin. Further, as shown in FIGS.
  • the magnetoelectric conversion element 23 includes two magnetoelectric conversion elements 23, that is, a first magnetoelectric conversion element 23 ⁇ / b> A and a second magnetoelectric conversion element 23 ⁇ / b> B. Note that the first magnetoelectric conversion element 23A and the second magnetoelectric conversion element 23B have the same outer shape (packaging size).
  • the first magnetoelectric conversion element 23A and the second magnetoelectric conversion element 23B are mounted on the substrate 9, and the first magnetoelectric conversion element 23A is arranged in the first gap K21.
  • the second magnetoelectric conversion element 23B is disposed in the second gap K22.
  • C3 C 16 + C 34 ⁇ C 14 / (C 34 + C 14) + C 35 ⁇ C 15 / (C 35 + C 15)
  • the capacitance between the second magneto-electric conversion element 23B and the magnetic core 21 is produced as a C 24 and C 25, the capacitance between the second magneto-electric conversion element 23B and the current path CB There occurs as C 26, as a result, the capacitance C4 of the total between the current paths CB and the second electromagnetic element 23B is as follows.
  • C4 C 26 + C 34 ⁇ C 24 / (C 34 + C 24) + C 35 ⁇ C 25 / (C 35 + C 25)
  • the magnetic sensing direction detected by the first magnetoelectric conversion element 23A is arranged to be the first magnetic sensing direction S21, and the sensitivity detected by the second magnetoelectric conversion element 23B. It arrange
  • the magnetosensitive direction here indicates a direction in which the value detected by the magnetoelectric conversion element 23 is positive.
  • the direction of the induced magnetic field in the first gap K21 in which the first magnetoelectric conversion element 23A is disposed is the first magnetic field direction M21, and the second magnetoelectric conversion element 23B.
  • the direction of the induced magnetic field in the second gap K22 in which is disposed is the second magnetic field direction M22.
  • the angle formed by the first magnetic field direction M21 of the first magnetic field applied to the first magnetoelectric transducer 23A and the first magnetosensitive direction S21 detected by the first magnetoelectric transducer 23A that is, 0 °
  • This is different from the angle formed by the direction M22 of the second magnetic field of the induced magnetic field applied to the magnetoelectric conversion element 23B and the second magnetosensitive direction S22 detected by the second magnetoelectric conversion element 23B, that is, 90 °.
  • the difference between the output values detected by the two magnetoelectric conversion elements 23 (23A, 23B) is calculated by the arithmetic unit 17. Can be compared.
  • the capacitance C4 is adjusted to be equal.
  • the electrostatic capacitance added to each magnetoelectric conversion element 23 (23A, 23B) can be accurately subtracted.
  • the influence of noise entering at the same timing can be reduced, and only the signal can be accurately detected.
  • two dielectrics 24, that is, the first dielectric 24A and the second dielectric are provided between the current path CB and the magnetic core 21.
  • the dielectric 24B is provided.
  • the dielectric constant and size of the dielectric 24 (the first dielectric 24A and the second dielectric 24B)
  • the total current between the current path CB and the first magnetoelectric transducer 23A is changed.
  • the above-described adjustment can be easily performed to make the capacitance C3 equal to the total capacitance C4 between the current path CB and the second magnetoelectric transducer 23B, and each total capacitance (C3 and C4) can be made more equal.
  • the material of the dielectric 24 is not limited, and may be a synthetic resin or an oxide, and may be a metal if it is non-magnetic. Further, as shown in FIG. 6C, the thicknesses of the two dielectrics 24 (the first dielectric 24A and the second dielectric 24B) are made the same and press-fitted between the current path CB and the magnetic core 21. In this arrangement, the dielectric 24 fixes the current path CB and plays a role of positioning the current path CB at the center of the magnetic core 21, and thus the current path CB and the two magnetoelectric transducers 23 (23 ⁇ / b> A, 23 ⁇ / b> B). ) Is the same distance from each other.
  • the first magnetic field direction M21 and the first magnetic sensing direction S21 are parallel, and the second magnetic field direction M22 and the second magnetic sensitive direction S22.
  • the first magnetoelectric conversion element 23A and the second magnetoelectric conversion element 23B are arranged in the first gap K21 and the second gap K22.
  • the induced magnetic field received by the second magnetoelectric conversion element 23B that is, the magnetic field of the second magnetic field direction M22 becomes 0, and the first magnetoelectric conversion element 23A and the second magnetoelectric conversion element 23B have different angles.
  • the external magnetic field received at will be different.
  • the 1st magnetoelectric conversion element is made into the 1st space
  • the first magnetoelectric conversion element 23A and the second magnetoelectric conversion element 23B are formed with the same outer shape (packaging size), the magnetic core 21, the first magnetoelectric conversion element 23A, and the second magnetoelectric conversion The area facing the element 23B is equal. As a result, the capacitances C 14 and C 24 , and C 15 and C 25 shown in FIG. 7 are equivalent.
  • the first gap K21 and the second gap K22 are arranged so as to be 90 ° and equidistant from the central axis Aj of the current path CB. Therefore, the distance between the current path CB and the first and second magnetoelectric conversion elements 23A and 23B can be arranged equally. Further, since the first magnetoelectric conversion element 23A and the second magnetoelectric conversion element 23B are formed with the same outer shape (packaging size), the current path CB, the first magnetoelectric conversion element 23A, and the second magnetoelectric conversion element The opposing area to 23B is equal. As a result, the capacitances C 16 and C 26 shown in FIG. 7 become equivalent.
  • the capacitances added to the respective magnetoelectric conversion elements 23 become more equal. Therefore, when the current sensor 102 is manufactured, the respective magnetoelectric conversion elements 23 (23A, 23A, It is easy to make the total capacitance (C3, C4) of 23B) more equal.
  • the current sensor 102 of the present invention includes the angle formed by the first magnetic field direction M21 and the first magnetic sensing direction S21, and the angle formed by the second magnetic field direction M22 and the second magnetic sensitive direction S22. Unlikely, the total capacitance C3 between the current path CB and the first magnetoelectric conversion element 23A is equal to the total capacitance C4 between the current path CB and the second magnetoelectric conversion element 23B.
  • the difference between the different output values detected by the two magnetoelectric conversion elements 23 (23A, 23B) is calculated by the calculation device 17, the influence of noise caused by electrostatic coupling can be accurately subtracted. As a result, the influence of noise entering at the same timing can be reduced, and only the signal can be accurately detected. Therefore, it is possible to provide the current sensor 102 that can measure the current value with high accuracy.
  • the dielectric 24 (first dielectric 24A and second dielectric 24B) is provided between the current path CB and the magnetic core 21, the dielectric 24 (first dielectric 24A and second dielectric 24A) is provided.
  • the dielectric constant and size of the dielectric 24B By changing the dielectric constant and size of the dielectric 24B), the total capacitance C3 between the current path CB and the first magnetoelectric conversion element 23A, and the current path CB and the second magnetoelectric conversion element 23B are changed.
  • the above-described adjustment to make the total electrostatic capacity C4 between the two terminals equal to each other can be facilitated, and the respective total electrostatic capacity (C3 and C4) can be made more equal.
  • the second magnetoelectric conversion element 23B receives the magnetic field.
  • the induced magnetic field becomes 0, that is, the magnetic field of the second magnetic field direction M22 is not felt, and the external magnetic fields received at different angles by the first magnetoelectric transducer 23A and the second magnetoelectric transducer 23B are different.
  • the influence of the external magnetic field can be calculated and canceled, and the influence from the external magnetic field can be easily reduced. .
  • the distance and the facing area between the current path CB and the first and second magnetoelectric conversion elements 23A and 23B are equal, and the magnetic core 21, the first magnetoelectric conversion element 23A and the second magnetoelectric conversion element Since the distance and the facing area to 23B are equal, the respective magnetoelectric transducers 23 (23A, 23B) and current paths CB, the respective magnetoelectric transducers 23 (23A, 23B) and the magnetic core 21 have the same capacitance. become. As a result, the electrostatic capacitance, which is the stray capacitance superimposed on each of the magnetoelectric conversion elements 23 (23A, 23B), becomes more equal. Therefore, when the current sensor 102 is manufactured, each of the magnetoelectric conversion elements 23 (23A) 23B), it is easy to make the total capacitance (C3, C4) more equal, and the influence of noise caused by electrostatic coupling can be further reduced.
  • FIG. 9 is a perspective view illustrating the current sensor 103 according to the third embodiment of the present invention.
  • 10A and 10B are diagrams illustrating the current sensor 103 according to the third embodiment of the present invention.
  • FIG. 10A is a front view seen from the Y2 side shown in FIG. 9, and
  • FIG. 10B is X1 shown in FIG. 10C is a side view seen from the side, and
  • FIG. 10C is a top view seen from the Z1 side shown in FIG. 9.
  • the second substrate 39B and the second magnetoelectric transducer 33B are omitted in FIG. 10C.
  • FIG. 11 is a schematic diagram illustrating the capacitance in the current sensor according to the third embodiment of the present invention.
  • FIG. 11 is a schematic diagram illustrating the capacitance in the current sensor according to the third embodiment of the present invention.
  • the current sensor 103 of the third embodiment is mainly different from the first embodiment in the arrangement positions of the gap K33 of the magnetic core 31 and the magnetoelectric conversion element 33.
  • symbol is attached
  • the current sensor 103 includes a current path CB through which a current to be measured flows and a magnetic body disposed at a position surrounding the current path CB with a hollow rectangle.
  • Core 31 two magnetoelectric conversion elements 33 (first magnetoelectric conversion element 33 ⁇ / b> A and second magnetoelectric conversion element 33 ⁇ / b> B) for detecting the magnetism of the induced magnetic field generated by the current flowing in current path CB, and the first magnetoelectric conversion And an arithmetic device 17 that calculates a difference in output between the element 33A and the second magnetoelectric conversion element 33B.
  • first substrate 39A on which the first magnetoelectric conversion element 33A and the arithmetic unit 17 are mounted, and a second substrate 39B on which the second magnetoelectric conversion element 33B is mounted are provided.
  • a wiring pattern (not shown) for transmitting output values from the first magnetoelectric conversion element 33A and the second magnetoelectric conversion element 33B to the arithmetic unit 17 is provided on the first substrate 39A and the second substrate 39B. Is provided.
  • the magnetic core 31 is made of a soft magnetic material, such as permalloy (Fe—Ni alloy), and is formed into a hollow rectangle as shown in FIGS. 9 and 10, and the magnetic core 31 has a gap on one side thereof. K33 is provided and configured. And the magnetic body core 31 is arrange
  • permalloy Fe—Ni alloy
  • Sendust Fe—Si—Al alloy
  • silicon steel etc.
  • other non-ferrous materials such as non-ferrous Amorphous magnetic alloy, oxide ferrite, etc. may be used.
  • the magnetoelectric conversion element 33 is a current sensor for detecting magnetism generated when a current flows through the current path CB.
  • the magnetoelectric conversion element 33 is a magnetoresistive element (GMR (Giant Magneto Resistive) element using a giant magnetoresistive effect).
  • GMR Magnetoresistive element
  • an antiferromagnetic layer is formed of an ⁇ -Fe 2 O 3 layer
  • a pinned layer is formed of a NiFe layer
  • an intermediate layer is formed of a Cu layer
  • a free layer is formed of a NiFe layer.
  • a GMR element is produced on a silicon substrate, and the cut out GMR chip is packaged with a thermosetting synthetic resin.
  • the magnetoelectric conversion element 33 includes two magnetoelectric conversion elements 33, that is, a first magnetoelectric conversion element 33A and a second magnetoelectric conversion element 33B. Note that the first magnetoelectric conversion element 33A and the second magnetoelectric conversion element 33B have the same outer shape (packaging size).
  • the first magnetoelectric conversion element 33A is mounted on a first substrate 39A such as a printed circuit board (PCB), and the second magnetoelectric conversion element 33B is printed wiring. It is mounted on a second substrate 39B such as a printed circuit board (PCB), and is arranged in the gap K33 in the thickness direction of the magnetic core 31 and arranged vertically so as to be equidistant from the current path CB. It is arranged.
  • a first substrate 39A such as a printed circuit board (PCB)
  • PCB printed circuit board
  • C5 C 19 + C 37 ⁇ C 17 / (C 37 + C 17) + C 37 ⁇ C 18 / (C 37 + C 18)
  • the capacitance between the second magneto-electric conversion element 33B and the magnetic core 31 is produced as a C 27 and C 28, the capacitance between the second magneto-electric conversion element 33B and the current path CB There occurs as C 29, as a result, the capacitance C6 of the total between the current paths CB and second magnetoelectric conversion element 33B are as the following equation.
  • C6 C 29 + C 37 ⁇ C 27 / (C 37 + C 27) + C 37 ⁇ C 28 / (C 37 + C 28)
  • the magnetic sensing direction detected by the first magnetoelectric conversion element 33A is arranged to be the first magnetic sensing direction S31, and the sensitivity detected by the second magnetoelectric conversion element 33B.
  • the magnetic direction is arranged to be a second magnetic sensing direction S32 opposite to the first magnetic sensing direction S31.
  • the magnetosensitive direction here indicates a direction in which the value detected by the magnetoelectric conversion element 33 is positive.
  • the direction of the magnetic field in the gap K33 in which the first magnetoelectric conversion element 33A and the second magnetoelectric conversion element 33B are disposed is a magnetic field direction M33 that is an induction magnetic field.
  • the angle formed by the direction M33 of the magnetic field applied to the first magnetoelectric conversion element 33A and the first magnetosensitive direction S31 detected by the first magnetoelectric conversion element 33A that is, 0 °
  • the second magnetoelectric conversion element 33B Is different from an angle formed by the direction M33 of the magnetic field applied to the second magnetic sensing direction S32 detected by the second magnetoelectric transducer 33B, that is, 180 °.
  • the output values detected by the two magnetoelectric conversion elements 33 (33A, 33B) are different, so the difference between the output values detected by the two magnetoelectric conversion elements 33 (33A, 33B) is calculated by the arithmetic unit 17. Can be compared.
  • the capacitance C6 is adjusted to be equal. Thereby, the electrostatic capacitance added to each magnetoelectric conversion element 33 (33A, 33B) can be accurately subtracted. As a result, the influence of noise entering at the same timing can be reduced, and only the signal can be accurately detected. Further, this adjustment is performed by slightly moving the arrangement position of the current path CB, or by inserting a dielectric between the magnetoelectric conversion element 33 and the magnetic core 31 in some cases.
  • positioned in the thickness direction of the magnetic body core 31 are electric current. Since they are arranged vertically so as to be equidistant with respect to the path CB, the total capacitance C5 between the current path CB and the first magnetoelectric transducer 33A, the current path CB and the second path The total capacitance C6 between the magnetoelectric conversion element 33B can be made more equal.
  • the magnetic field direction M33 and the first magnetic sensing direction S31 are parallel, and the magnetic field direction M33 and the second magnetic sensing direction S32 are parallel. Therefore, the induction magnetic fields received by the first magnetoelectric conversion element 33A and the second magnetoelectric conversion element 33B are the same as absolute values, and the first magnetoelectric conversion element 33A and the second magnetoelectric conversion element 33B are respectively External magnetic fields received at different angles will be different. Thereby, by comparing the first magnetoelectric conversion element 33A and the second magnetoelectric conversion element 33B, the influence of the external magnetic field can be calculated and canceled, and the influence from the external magnetic field can be easily reduced. .
  • the current sensor 103 of the present invention is different in the angle formed between the magnetic field direction M33 and the first magnetic sensing direction S31 and the angle formed between the magnetic field direction M33 and the second magnetic sensitive direction S32.
  • the output values detected by the two magnetoelectric conversion elements 33 (33A, 33B) are different, and the difference between the output values detected by the two magnetoelectric conversion elements 33 (33A, 33B) is calculated by the arithmetic unit 17 and compared. it can.
  • the total capacitance C5 between the current path CB and the first magnetoelectric conversion element 33A is equal to the total capacitance C6 between the current path CB and the second magnetoelectric conversion element 33B.
  • the first magnetoelectric conversion element 33A and the second magnetoelectric conversion element 33B arranged in the thickness direction of the magnetic core 31 are arranged vertically so as to be equidistant from the current path CB.
  • the total capacitance C5 between the current path CB and the first magnetoelectric conversion element 33A and the total capacitance C6 between the current path CB and the second magnetoelectric conversion element 33B are made more equal. be able to. For this reason, when calculating the difference between the different output values detected by the two magnetoelectric conversion elements 33 (33A, 33B) by the calculation device 17, it is possible to subtract the influence of noise caused by the capacitance more accurately. . As a result, the influence of noise that enters at the same timing can be further reduced, and only the signal can be detected more accurately.
  • the first magnetoelectric transducer 33A and the second magnetoelectric element 33A since the magnetic field direction M33 and the first magnetic sensing direction S31 are parallel, and the magnetic field direction M33 and the second magnetic sensing direction S32 are parallel, the first magnetoelectric transducer 33A and the second magnetoelectric element 33A.
  • the induction magnetic fields received by the conversion element 33B are the same in absolute value, and the external magnetic fields received by the first magnetoelectric conversion element 33A and the second magnetoelectric conversion element 33B at different angles are different. Thereby, by comparing the first magnetoelectric conversion element 33A and the second magnetoelectric conversion element 33B, the influence of the external magnetic field can be calculated and canceled, and the influence from the external magnetic field can be easily reduced. .
  • FIG. 13 is a diagram for explaining a modification of the current sensor 101 according to the first embodiment of the present invention.
  • FIG. 13A shows a modification 1 in which the arrangement position of the magnetoelectric transducer 13 (13A, 13B) is changed.
  • FIG. 13B is a current sensor C101 of Modification 2 in which the arrangement position of the magnetoelectric conversion element 13 (13B) is changed.
  • FIG. 14 is a schematic diagram for explaining a modification of the current sensors (101, 102) of the first embodiment and the second embodiment of the present invention.
  • FIG. 14A shows the magnetoelectric conversion element 13 of the first embodiment.
  • FIG. 14B is a fourth modification in which the arrangement position of the magnetoelectric transducer 23 of the second embodiment is changed.
  • FIG. 15 is a diagram for explaining a modification of the current sensors (101, 102) according to the first and second embodiments of the present invention.
  • FIG. 15A shows the current path CB and the magnetic body according to the first embodiment.
  • FIG. 15B is a sixth modification in which the core 11 is changed, and
  • FIG. 15B is a sixth modification in which the current path CB and the magnetic core 21 of the second embodiment are changed.
  • FIG. 16 is a diagram for explaining a modification of the current sensor 102 according to the second embodiment of the present invention, and is a current sensor D102 of the modification 9 in which the arrangement position of the magnetoelectric conversion element 23 is changed.
  • FIG. 17 is a top view illustrating a modification of the current sensor 103 according to the third embodiment of the present invention.
  • FIG. 17A illustrates a modification 10 in which the arrangement position of the magnetoelectric transducer 33 according to the third embodiment is changed.
  • FIG. 17B is a current sensor D123 of Modification 11 in which the arrangement position of the magnetoelectric conversion element 33 of the third embodiment is changed.
  • the first magnetoelectric conversion element 13A and the second magnetoelectric conversion element 13B are positioned at the centers of the respective gaps (K11, K12) of the first gap K11 and the second gap K12. by disposing the capacitance of the magnetic core 11 and the first electromagnetic element 13A and the second magneto-electric conversion element 13B, C 11 and C 21, and C 12 and preferably as C 22 is equal to However, they may be shifted from each other. As shown in FIG. 13A, the first magnetoelectric conversion element 13A and the second magnetoelectric conversion element 13B are relative to each of the first gap K11 and the second gap K12 (K11, K12). If the target positional relationship is made equal, the same effect is obtained.
  • the magnetic core 11 is configured such that the first gap K11 and the second gap K12 are symmetrical with respect to the central axis Aj of the current path CB.
  • the arrangement angle with the second gap K12 may be changed.
  • the arrangement angle of the magnetic core C11 with the first gap K11 and the second gap CK12 is 135 °.
  • the first magnetic field direction M11 and the first magnetic sensing direction S11 are parallel, and the second magnetic field direction M12 and the second magnetic sensing direction S12 are parallel.
  • the magnetoelectric conversion element 13A and the second magnetoelectric conversion element 13B are preferably arranged and configured, the magnetosensitive directions of the first magnetoelectric conversion element 13A and the second magnetoelectric conversion element 13B may be changed.
  • the angle formed by the first magnetic field direction M11 of the induced magnetic field applied to the first magnetoelectric transducer 13A and the first magnetosensitive direction CS11 detected by the first magnetoelectric transducer 13A that is, 15 °.
  • the angle formed by the second magnetic direction CS12 detected by the second magnetoelectric conversion element 13B and the direction M12 of the second magnetic field of the induced magnetic field applied to the second magnetoelectric conversion element 13B that is, 75 °. .
  • the first magnetic field direction M21 and the first magnetosensitive direction S21 are parallel, and the second magnetic field direction M22 and the second magnetic sensitive direction S22 are orthogonal to each other.
  • the magnetoelectric conversion element 23A and the second magnetoelectric conversion element 23B are preferably arranged, but may be configured by changing the magnetic sensitive direction of the first magnetoelectric conversion element 23A and the second magnetoelectric conversion element 23B. .
  • the angle formed by the first magnetic field direction M21 of the induced magnetic field applied to the first magnetoelectric transducer 23A and the first magnetosensitive direction CS21 detected by the first magnetoelectric transducer 23A that is, 30 °.
  • the angle formed by the second magnetic direction CS22 detected by the second magnetoelectric conversion element 23B and the direction M22 of the second magnetic field of the induced magnetic field applied to the second magnetoelectric conversion element 23B that is, 60 °. .
  • the current path CB has a circular cross section, but a current path CCB having a rectangular cross section may be used. In that case, as shown to FIG. 15A, it is good to make the magnetic body core C12 of the current sensor C501 into an elliptical shape. Similarly, as shown in FIG. 15B, the magnetic core C21 of the current sensor C602 may be rectangular.
  • two dielectrics are used between the current path CB and the magnetic cores (11, 21). You may comprise using the above dielectric material. Or the structure which does not use a dielectric material may be sufficient.
  • ⁇ Modification 8> In the first embodiment and the second embodiment, two dielectrics (14, 24) are used between the current path CB and the magnetic cores (11, 21). However, the magnetoelectric conversion element (13 23) and the magnetic core (11, 21) may be configured using a dielectric. In this case, the same effect can be obtained.
  • the first gap K21 and the second gap K22 are arranged to be 90 ° with respect to the central axis Aj of the current path CB.
  • the first gap CK21 and the second gap CK22 may be disposed in the vicinity of the rectangular corner of the magnetic core C71. For this reason, since the first magnetoelectric conversion element 23A and the second magnetoelectric conversion element 23B can be disposed close to each other, the external magnetic field is entered at the same timing even when the source of the external magnetic field is relatively close. The influence of the incoming noise can be reduced, and the influence from the external magnetic field can be more reliably reduced.
  • the first magnetoelectric conversion element 33A and the second magnetoelectric conversion element 33B are arranged vertically in the thickness direction of the magnetic core 31, but as shown in FIG. 17A, You may arrange

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Abstract

La présente invention concerne un capteur de courant sur lequel le bruit a moins d'incidence et qui peut mesurer une valeur de courant très précisément. Le capteur de courant de la présente invention est caractérisé en ce qu'il est pourvu : d'un noyau de matière magnétique (11), qui est disposé en une position entourant un trajet de courant (CB) ayant, circulant dans celui-ci, un courant à mesurer, et qui présente un premier intervalle et un second intervalle ; d'un premier élément de conversion magnétoélectrique (13A), qui est disposé dans le premier intervalle du noyau de matière magnétique ; d'un second élément de conversion magnétoélectrique (13B), qui est disposé dans le second intervalle du noyau de matière magnétique ; d'un appareil de calcul, qui calcule une différence entre la sortie du premier élément de conversion magnétoélectrique et celle du second élément de conversion magnétoélectrique. Le capteur de courant est également caractérisé en ce : qu'un angle formé par la direction d'un premier champ magnétique d'un champ magnétique inductif, appliqué au premier élément de conversion magnétoélectrique, et la première direction de détection magnétique, détectée au moyen du premier élément de conversion magnétoélectrique, et un angle formé par la direction d'un second champ magnétique d'un champ magnétique inductif, appliqué au second élément de conversion magnétoélectrique, et la seconde direction de détection magnétique, détectée au moyen du second élément de conversion magnétoélectrique, sont différents l'un de l'autre ; qu'une capacité électrostatique totale entre le trajet de courant et le premier élément de conversion magnétoélectrique, et une capacité électrostatique totale entre le trajet de courant et le second élément de conversion magnétoélectrique sont égales l'une à l'autre.
PCT/JP2013/059094 2012-04-27 2013-03-27 Capteur de courant WO2013161496A1 (fr)

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JPWO2015133621A1 (ja) * 2014-03-07 2017-04-06 日立金属株式会社 電流量検出器
CN110446933A (zh) * 2016-12-14 2019-11-12 韩国标准科学研究院 多钳位电流测量装置和电流测量系统
EP3657180A1 (fr) * 2018-11-22 2020-05-27 Valeo Siemens eAutomotive France SAS Noyau magnetique pour capteur de mesure de courant

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JPS57128854A (en) * 1981-02-02 1982-08-10 Mitsubishi Electric Corp Current transformer
JPH04250365A (ja) * 1991-01-28 1992-09-07 Akutasu Power Drive Kk 電流検出器
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JP2012047564A (ja) * 2010-08-26 2012-03-08 Sumitomo Wiring Syst Ltd 電流検出装置

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Publication number Priority date Publication date Assignee Title
JPS4871681A (fr) * 1971-12-28 1973-09-27
JPS57128854A (en) * 1981-02-02 1982-08-10 Mitsubishi Electric Corp Current transformer
JPH04250365A (ja) * 1991-01-28 1992-09-07 Akutasu Power Drive Kk 電流検出器
JP2003315376A (ja) * 2002-04-18 2003-11-06 Aichi Micro Intelligent Corp 電流センサ
JP2011158337A (ja) * 2010-01-29 2011-08-18 Aichi Micro Intelligent Corp 電流センサ
JP2012047564A (ja) * 2010-08-26 2012-03-08 Sumitomo Wiring Syst Ltd 電流検出装置

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPWO2015133621A1 (ja) * 2014-03-07 2017-04-06 日立金属株式会社 電流量検出器
CN110446933A (zh) * 2016-12-14 2019-11-12 韩国标准科学研究院 多钳位电流测量装置和电流测量系统
EP3557267A4 (fr) * 2016-12-14 2020-07-29 Korea Research Institute of Standards and Science Dispositif de mesure à multi-pinces et système de mesure de courant
EP3657180A1 (fr) * 2018-11-22 2020-05-27 Valeo Siemens eAutomotive France SAS Noyau magnetique pour capteur de mesure de courant
FR3089013A1 (fr) * 2018-11-22 2020-05-29 Valeo Siemens Eautomotive France Sas Noyau magnetique pour capteur de mesure de courant
CN111289790A (zh) * 2018-11-22 2020-06-16 维洛西门子新能源汽车法国简式股份公司 电流测量传感器用磁芯

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