WO2022014266A1 - 電流検出装置 - Google Patents

電流検出装置 Download PDF

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Publication number
WO2022014266A1
WO2022014266A1 PCT/JP2021/023376 JP2021023376W WO2022014266A1 WO 2022014266 A1 WO2022014266 A1 WO 2022014266A1 JP 2021023376 W JP2021023376 W JP 2021023376W WO 2022014266 A1 WO2022014266 A1 WO 2022014266A1
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WO
WIPO (PCT)
Prior art keywords
current detection
bus bar
adjacent
shields
shield
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2021/023376
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English (en)
French (fr)
Japanese (ja)
Inventor
学 田村
稔 安部
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Alps Alpine Co Ltd
Original Assignee
Alps Alpine Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Alps Alpine Co Ltd filed Critical Alps Alpine Co Ltd
Priority to JP2022536197A priority Critical patent/JP7466646B2/ja
Priority to DE112021003837.0T priority patent/DE112021003837T5/de
Priority to CN202180040701.6A priority patent/CN115698730A/zh
Publication of WO2022014266A1 publication Critical patent/WO2022014266A1/ja
Priority to US18/061,337 priority patent/US12135342B2/en
Anticipated expiration legal-status Critical
Priority to JP2024019595A priority patent/JP2024056856A/ja
Ceased legal-status Critical Current

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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
    • 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
    • G01R15/146—Measuring arrangements for current not covered by other subgroups of G01R15/14, e.g. using current dividers, shunts, or measuring a voltage drop
    • G01R15/148—Measuring arrangements for current not covered by other subgroups of G01R15/14, e.g. using current dividers, shunts, or measuring a voltage drop involving the measuring of a magnetic field or electric field
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/0092—Measuring current only
    • 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
    • G01R15/202—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 using Hall-effect devices
    • 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
    • G01R15/205—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 using magneto-resistance devices, e.g. field plates

Definitions

  • the present invention relates to a current detection device that measures a measured current based on a magnetic field generated by a measured current flowing through a bus bar.
  • the current sensor described in Patent Document 1 includes a conductor through which a measured current flows, a magnetic sensor for measuring an induced magnetic field in which a measured current is generated, an accommodation space for accommodating the conductor and the magnetic sensor, and an accommodation space leading to the accommodation space. It has a case with a space opening, a lid covering the accommodation space opening, and a magnetic shield with a lid integrally molded to the lid, the lid having a shield exposed opening with the edges of the lid magnetic shield exposed. Has. As a result, by looking at the shield exposed opening, it is possible to easily visually confirm whether the magnetic shield of the lid is fixed in the correct position inside the lid.
  • the present invention aims to reduce the size of the configuration when the bus bar and the magnetic sensor are viewed along the opposite directions while suppressing the influence of the magnetic field generated by the measured current flowing through the adjacent bus bars (current paths). It is an object of the present invention to provide a current detection device capable of capable.
  • the current detection device of the present invention has a bus bar through which a current to be measured flows, a magnetic sensor arranged at a position facing the bus bar, and a bus bar and magnetism in the opposite direction between the bus bar and the magnetic sensor. It is a current detection device in which a pair of shields arranged so as to sandwich a sensor and a plurality of current detection units provided therein are arranged. It is characterized in that the positions of the shields and magnetic sensors of the adjacent current detection units are different from each other in the extension direction of the bus bar when they are extended and viewed along the opposite direction. As a result, it is possible to suppress the influence of the magnetic field generated by the measured current flowing through the adjacent bus bars, and it is possible to reduce the size of the configuration when the bus bars and the magnetic sensor are viewed along the opposite directions.
  • the shields of adjacent current detection units partially overlap each other in the direction in which the bus bars are arranged in parallel when viewed along the extension direction of the bus bars. ..
  • the shields of adjacent current detection units partially overlap each other in the direction in which the bus bars are arranged in parallel when viewed along the extension direction of the bus bars. ..
  • the positions of the shields in the opposite direction are the same as each other in the adjacent current detection units, and the positions of the magnetic sensors in the opposite direction are the same as each other. This makes it possible to keep the size of the shield in the opposite direction small.
  • the pair of shields extends to a position overlapping the bus bar of the adjacent current detection unit when viewed along the opposite direction.
  • the shield when viewed along the opposite direction, has a notch in a part of the outer edge, and the notch is combined with a part of the outer edge of the adjacent shield. Is preferable. As a result, when viewed along the opposite direction, adjacent shields can be arranged more efficiently, so that the overall size can be reduced.
  • FIG. 1 It is a perspective view which shows the structure of the current detection apparatus which concerns on 1st Embodiment of this invention.
  • (A) is a front view showing the configuration of a current detection unit provided with a single bus bar, a corresponding magnetic sensor, and a pair of shields in the first embodiment, and (b) is the first embodiment.
  • (c) is a front view of (b).
  • (A) is a plan view showing the configuration of the three bus bars in the first modification, the three magnetic sensors corresponding to each, and the three pairs of shields, and (b) is the three in the second modification.
  • (A) is a plan view showing the configuration of three bus bars, three magnetic sensors corresponding to each, and three pairs of shields in the second embodiment
  • (b) is a plan view showing the configuration of three pairs of shields, respectively. It is a top view which shows the structure of the bus bar of a book, three magnetic sensors corresponding to each, and three pairs of shields. It is a graph which shows the change of the adjacency influence error (adjacent error) with respect to the applied amount of a bus bar and a shield in Examples 1 and 2 of 2nd Embodiment and Comparative Examples 1 and 2.
  • (A) is a front view showing the configuration of three bus bars, three magnetic sensors corresponding to each, and three pairs of shields in the third embodiment
  • (b) is a plan view of (a). Is.
  • XYZ coordinates are shown as reference coordinates.
  • the Z1-Z2 direction is referred to as a vertical direction
  • the X1-X2 direction is referred to as a front-back direction
  • the Y1-Y2 direction is referred to as a left-right direction.
  • the X1-X2 direction and the Y1-Y2 direction are perpendicular to each other, and the XY plane including them is perpendicular to the Z1-Z2 direction.
  • a state in which the lower side (Z2 side) is viewed from the upper side (Z1 side) may be referred to as a plan view.
  • the current detection device 10 is a current path 3 arranged so as to penetrate the case member 11 and the inside of the case member 11 in the front-rear direction (X1-X2 direction). It is equipped with two bus bars 21, 22, and 23.
  • the three bus bars 21, 22, and 23 have a long plate shape having the same shape as each other, and are juxtaposed with each other and extended along the front-rear direction.
  • FIGS. 2 (b) and 2 (c) it is generated by a current to be measured flowing through each of the three bus bars 21, 22, and 23 at positions facing each other in the case member 11.
  • Three magnetic sensors 61, 62, and 63 that can detect the magnetic field to be generated are provided.
  • the first bus bar 21 and the first magnetic sensor 61 facing each other in the vertical direction (Z1-Z2 direction) at the position on the left side are sandwiched from above and below by a pair of shields 31 and 41. ing.
  • a pair of shields 31 and 41 are arranged so as to sandwich the first bus bar 21 and the first magnetic sensor 61 in the opposite direction between the first bus bar 21 and the first magnetic sensor 61.
  • the first upper shield 31, the first magnetic sensor 61, the first bus bar 21, and the first lower shield 41 are arranged in order from the upper side to the lower side, and the first current detection in which the members arranged vertically face each other.
  • Part 10a is configured.
  • the second bus bar 22 and the second magnetic sensor 62 which face each other in the vertical direction at the central position, are sandwiched from above and below by another pair of shields 32 and 42, and are on the upper side.
  • the second upper shield 32, the second magnetic sensor 62, the second bus bar 22, and the second lower shield 42 are arranged in this order from the lower side to the lower side, and the second current detection unit 10b in which the vertically arranged members face each other is configured. Will be done.
  • the third bus bar 23 and the third magnetic sensor 63 which face each other in the vertical direction, are sandwiched from above and below by yet another pair of shields 33 and 43, and are sequentially sandwiched from the upper side to the lower side.
  • the third upper shield 33, the third magnetic sensor 63, the third bus bar 23, and the third lower shield 43 are arranged, and a third current detection unit 10c in which the vertically arranged members face each other is configured.
  • the three magnetic sensors 61, 62, and 63 are arranged on the lower surface of the substrate 50 housed in the case member 11 as an example of the first magnetic sensor 61 in FIG. 2A.
  • the three magnetic sensors 61, 62, and 63 are the same element, and for example, a magnetoresistive effect element and a Hall element are used depending on the specifications of the current detection device and other conditions.
  • the three upper shields 31, 32, 33 are arranged at the same position as each other, and the three magnetic sensors 61, 62, 63 are also arranged at the same position with each other.
  • the three bus bars 21, 22, and 23 are also arranged at the same position as each other, and the three lower shields 41, 42, and 43 are also arranged at the same position with each other.
  • each shield has a structure in which five rectangular plates made of the same magnetic material in a plan view are laminated.
  • the left first upper shield 31, the first magnetic sensor 61, the first lower shield 41 below it, and the right third upper shield 33, the third magnetic sensor 63. , And the third lower shield 43 below it are arranged at the same position in the front-rear direction.
  • the central second upper shield 32, the second magnetic sensor 62, and the lower second lower shield 42 are arranged in front of them at positions where they do not overlap. That is, when the current detection units adjacent to each other in the left-right direction are viewed along the vertical direction (opposite direction between the first bus bar 21 and the first magnetic sensor 61), the shield and the magnetic sensor are arranged at different positions from each other. There is.
  • the three current detection units are arranged so as to be staggered in the front-rear direction.
  • the shields of the current detection units adjacent to each other in the left-right direction are in the front-rear direction, that is, in the direction (Y1-) in which the buses 21, 22, and 23 are arranged in parallel. In the Y2 direction), they are arranged so that they partially overlap each other.
  • the adjacent state in the left-right direction means a state in which the bus bars 21, 22, and 23 are arranged side by side when viewed along the extending direction, and the front-back direction. It is also included when it is off to.
  • the current detection units are arranged so as to be adjacent to each other in the left-right direction, and the shield and the magnetic sensor of the current detection unit are in the front-rear direction (X1-X2 direction) when viewed along the vertical direction. They are arranged so as to be staggered in each other, and some of them overlap each other in the left-right direction.
  • the bus bars 21, 22, and 23 can be arranged in parallel, and the distance between the current detection units can be shortened in the direction in which they are arranged in parallel (Y1-Y2 direction). For this reason, the size in the front-rear direction (X1-X2 direction) can be suppressed by arranging the shields side by side without shifting them back and forth, and the shields are arranged in a staggered manner in the left-right direction (Y1-Y2 direction). The size can be reduced. Further, in this arrangement, the distance between the bus bars 21, 22, and 23 is reduced without reducing the size of the shield, so that sufficient shielding property is ensured.
  • the two current detection units arranged at both ends of the three adjacent current detection units are shown in FIG. 2. It is preferable to arrange them at the same position in the front-rear direction (extending direction of the bus bar), such as the positional relationship between the first current detection unit 10a and the third current detection unit 10c. With such an arrangement, it is possible to minimize the increase in size of the current detection device 10 in the front-rear direction.
  • the above-mentioned three upper shields 31, 32, 33 and three lower shields 41, 42, 43 have a configuration in which five flat plate-shaped magnetic materials are laminated, but the number of layers is five. It can be set arbitrarily other than the sheet, or it can be a single layer.
  • the three upper shields 31, 32, 33 and the three lower shields 41, 42, 43 are rectangular in plan view, but FIGS. 3A, 3B, 3C. ),
  • the shape may have a notch portion in which the four corner portions of the rectangle are notched inward. With such a shape, it is possible to arrange the cutouts of adjacent shields so that they mesh with each other in a plan view. Therefore, in the extending direction (X1-X2 direction) of the bus bars 21, 22, and 23,
  • the three upper shields 31, 32, 33 and the three lower shields 41, 42, 43 can be staggered in a narrower range, and the overall size can be kept small.
  • the notches so that they mesh with each other, the distance between the current detection units in the left-right direction (Y1-Y2 direction) is reduced so that the shield does not hit the bus bar of the adjacent current detection units. can do.
  • Examples of the cutout portion include those shown in FIGS. 3A, 3B, and 3C.
  • the three upper shields 131, 132, and 133 shown in the modified example 1 of FIG. 3A notches 131c, 132c, and 133c, which are notched at four corners in a rectangular shape, are provided and adjacent to each other.
  • the three current detection units can be compactly arranged in the left-right direction and the front-rear direction. It will be possible.
  • notches 231c, 232c, and 233c in which the four corners are cut out in a triangular shape are provided and adjacent to each other.
  • the four corner portions are cut out in a triangular shape having a larger size than the modified example 2, and the notched portions 331c, 332c, and 333c are cut out.
  • the vertical sides of the adjacent notches are arranged so as to face each other, it is possible to arrange the three current detection units more compactly in the left-right direction and the front-back direction than in the case of the second modification. Become.
  • the second embodiment is different from the first embodiment in that a part of the shield, that is, the end portion in the left-right direction extends to a position where it overlaps on the bus bar of the adjacent current detection unit.
  • Other configurations are the same as those of the first embodiment, the same reference numerals are used for the same members, and detailed description thereof will be omitted.
  • three upper shields 431, 432, and 433 having the same configuration as each other are provided.
  • three magnetic sensors 61, 62, 63, and three bus bars 21, 22, 23 are sandwiched under the shields, as in the first embodiment, and the upper shields 431, 432 are sandwiched under the shields. It has the same configuration as each of the 433s, and is provided with three lower shields facing each other.
  • the first upper shield 431 on the left side and the third upper shield 433 on the right side are arranged at the same position in the front-rear direction, while the second upper shield 432 in the center is from these. Is located on the front side and does not overlap.
  • the right end of the first upper shield 431 extends to a position overlapping the central second bus bar 22, and in the second upper shield 432, the left end thereof overlaps the left first bus bar 21. Moreover, the right end portion is extended to a position where it overlaps with the third bus bar 23 on the right side. Further, the third upper shield 433 extends to a position where the left end portion overlaps with the central second bus bar 22.
  • the ends of the upper shields 431, 432, and 433 in the left-right direction overlap with each other with the same width L (width in the left-right direction, amount of engagement) with respect to the adjacent bus bars.
  • the left-right end of the shield by extending the left-right end of the shield to a position where it overlaps the bus bar of the adjacent current detection section, the magnetic field generated by the measured current flowing through the bus bar of the adjacent current detection section.
  • it is easy to pass through the shield of the current detection unit it is possible to suppress the influence error (adjacent influence error) due to the magnetic field generated in the adjacent current detection units to a small value.
  • FIG. 5 shows the adjacent influence error (unit%) with respect to the amount of the bus bar and the shield applied (unit: mm) (width of overlap in the left-right direction L) in Examples 1 and 2 and Comparative Examples 1 and 2 of the second embodiment. It is a graph which shows the result obtained by the simulation of the change.
  • the adjacent influence error is a numerical value obtained by dividing the difference between the measured values of the magnetic field measured when the measured current is passed through the adjacent bus bars and when the measured current is not passed, by the measured value measured when the measured current is not passed. The ratio is based on.
  • Example 1 and 2 the numerical values are set as follows in the configuration shown in FIG. 4 (a).
  • Overlapping width (applied amount) L between the end of the shield and the bus bar Example 1 -6 mm to 6 mm, Example 2 -4 mm to 4 mm
  • the shield and the bus bar do not overlap, when it is zero, the positions of the end faces in the left-right direction of both are the same, and when it is negative, the end faces of both are only the numerical value. They are separated from each other.
  • Comparative Examples 1 and 2 have the configuration shown in FIG. 4 (b). Specifically, as in the second embodiment, the three bus bars 21, 22, and 23 are arranged in parallel in the left-right direction, and the three magnetisms in the vertical direction with respect to each of the bus bars 21, 22, 23. Sensors (not shown) are arranged, and three upper shields 531, 532, 533 and three lower shields (not shown) are arranged so as to sandwich the bus bar and the magnetic sensor facing each other from above and below. As a result, three current detection units are arranged in parallel in the left-right direction.
  • the three upper shields 531, 532, 533 and the lower shields (not shown) facing each other are arranged at the same position in the front-rear direction so as to extend along the left-right direction, respectively, and the left and right sides thereof. Both ends in the direction are separated from the ends of adjacent shields.
  • Comparative Examples 1 and 2 the numerical values are set as follows in the configuration shown in FIG. 4 (b). (1) Distance between the end of the shield and the bus bar (left-right direction): This distance is the distance between the end of the shield and the end of the bus bar facing the shield in the vertical direction, for example, the distance between the left end of the bus bar 21 and the left end of the shield 531. Comparative Example 1 2 mm, Comparative Example 2 1 mm (2) Width W of bus bars 21, 22, 23: 10 mm for both Comparative Examples 1 and 2.
  • the three bus bars 621, 622, and 623 are arranged in parallel in the left-right direction (Y1-Y2 direction) as in the first and second embodiments, and each of them is arranged in parallel. It is extended in the front-back direction.
  • three magnetic sensors 661, 662, and 663 are arranged so as to face each other.
  • the first upper shield 631 and the first lower shield 641 face each other vertically so as to sandwich the first bus bar 621 and the first magnetic sensor 661 facing each other from above and below.
  • the first current detection unit 60a is configured by these arrangements.
  • the second upper shield 632 and the second lower shield 642 are arranged so as to sandwich the second bus bar 622 and the first magnetic sensor 662 facing each other from above and below, so that the second upper shield 632 and the second lower shield 642 face each other vertically.
  • the current detection unit 60b is configured.
  • the third upper shield 633 and the first lower shield 643 are arranged so as to sandwich the third bus bar 623 and the third magnetic sensor 663 facing each other from above and below, so that the third bus bar 623 and the first lower shield 643 face each other vertically.
  • the detection unit 60c is configured.
  • the second current detection unit 60b is arranged below the first current detection unit 60a and the third current detection unit 60c, which are arranged at the same positions as each other.
  • the left and right ends of the second upper shield 632 and the second lower shield 642 in the second current detection unit 60b are inside the first current detection unit 60a.
  • the third current detection unit 60c it has entered to a position where it does not come into contact with the magnetic sensor or the bus bar.
  • the three bus bars can be arranged in parallel in the left-right direction without shifting in the front-rear direction, it is possible to suppress the size increase in the extension direction (X1-X2 direction) of the bus bars. Further, since the adjacent shields are overlapped in the left-right direction, the size in the left-right direction can be suppressed.
  • the current detection device has a small size when viewed along the direction in which the bus bar and the magnetic sensor face each other, while suppressing the influence of the magnetic field generated by the measured current flowing through the adjacent bus bars. It is useful in that it can be converted.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
PCT/JP2021/023376 2020-07-14 2021-06-21 電流検出装置 Ceased WO2022014266A1 (ja)

Priority Applications (5)

Application Number Priority Date Filing Date Title
JP2022536197A JP7466646B2 (ja) 2020-07-14 2021-06-21 電流検出装置
DE112021003837.0T DE112021003837T5 (de) 2020-07-14 2021-06-21 Stromerfassungsvorrichtung
CN202180040701.6A CN115698730A (zh) 2020-07-14 2021-06-21 电流检测装置
US18/061,337 US12135342B2 (en) 2020-07-14 2022-12-02 Current detection device
JP2024019595A JP2024056856A (ja) 2020-07-14 2024-02-13 電流検出装置

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2020120611 2020-07-14
JP2020-120611 2020-07-14

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US18/061,337 Continuation US12135342B2 (en) 2020-07-14 2022-12-02 Current detection device

Publications (1)

Publication Number Publication Date
WO2022014266A1 true WO2022014266A1 (ja) 2022-01-20

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PCT/JP2021/023376 Ceased WO2022014266A1 (ja) 2020-07-14 2021-06-21 電流検出装置

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US (1) US12135342B2 (https=)
JP (2) JP7466646B2 (https=)
CN (1) CN115698730A (https=)
DE (1) DE112021003837T5 (https=)
WO (1) WO2022014266A1 (https=)

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JP2024146826A (ja) * 2023-03-31 2024-10-15 旭化成エレクトロニクス株式会社 電流測定モジュール

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