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WO2013038867A1 - Capteur de courant électrique - Google Patents

Capteur de courant électrique Download PDF

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Publication number
WO2013038867A1
WO2013038867A1 PCT/JP2012/070817 JP2012070817W WO2013038867A1 WO 2013038867 A1 WO2013038867 A1 WO 2013038867A1 JP 2012070817 W JP2012070817 W JP 2012070817W WO 2013038867 A1 WO2013038867 A1 WO 2013038867A1
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WIPO (PCT)
Prior art keywords
current path
current
sub
main
path
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PCT/JP2012/070817
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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 WO2013038867A1 publication Critical patent/WO2013038867A1/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 can measure the current flowing through a conductor while eliminating the influence of a disturbance magnetic field.
  • a current sensor that can measure these large currents in a non-contact manner is required.
  • a current sensor that detects a change in a magnetic field caused by a current to be measured by a plurality of magnetic sensors has been proposed.
  • a current sensor has been proposed in which differential processing is performed on detection values obtained by two magnetosensitive elements to eliminate the influence of a disturbance magnetic field.
  • an opening is formed in the central portion of the current path and branches into two of the first and second current paths.
  • the first current path is located in the vicinity of the first current path.
  • a first magnetosensitive element for detecting a magnetic field due to a current flowing through the current path is provided, and a second sensitivity for detecting a magnetic field due to the current flowing through the second current path is provided in the vicinity of the second current path.
  • a magnetic element is provided. The first magnetosensitive element and the second magnetosensitive element are almost equally affected by the external magnetic field.
  • the distance from one current path is set to the other current path for each of the first and second magnetosensitive elements. It is necessary to make it sufficiently smaller than the distance. As a result, in the above-described current sensor, it is necessary to increase the distance between the first magnetosensitive element and the second magnetosensitive element arranged between the first current path and the second current path. Therefore, the current sensor cannot be reduced in size.
  • the present invention has been made in view of such points, and in a current sensor that eliminates the influence of an external magnetic field by performing arithmetic processing on detection values of two magnetosensitive elements while maintaining current measurement accuracy.
  • An object of the present invention is to provide a current sensor that can be miniaturized.
  • the current sensor of the present invention includes a main current path and a current path including a region formed by a pair of sub current paths arranged in parallel at intervals on both sides of the main current path; A pair of magnetosensitive elements provided between the current path and each sub-current path, and an arithmetic circuit that calculates the current value of the main current path based on the detection value of the pair of magnetosensitive elements.
  • the resistance values of the pair of sub current paths are equal, and the resistance values of the main current path are different from the resistance values of the pair of sub current paths.
  • the induced magnetic field due to the current to be measured is not canceled out.
  • the magnetosensitive element reliably detects the induced magnetic field due to the current to be measured. can do.
  • the measurement accuracy of the current value of the current path can be maintained without increasing the distance between the pair of magnetosensitive elements, and the current sensor can be downsized.
  • the pair of magnetosensitive elements may be provided so as to be symmetrical with respect to the center of the main current path in a sectional view of the region.
  • the pair of magnetosensitive elements includes a direction in which the main current path and the sub current path are arranged, and a direction in which current flows through the main current path and the sub current path.
  • Each may be arranged so as to have a sensitivity axis in a direction parallel to the orthogonal direction. According to this configuration, the direction of the magnetic field in the main current path detected by each magneto-sensitive element and the direction of the magnetic field in the sub current path are reversed, and the mutual magnetic fields are offset. Even when current flows, the measurement accuracy of the current value in the main current path can be maintained.
  • the main current path and the sub current path may be made of the same material, and the cross-sectional areas in the cross-sectional view of the region may be different. According to this configuration, since the main current path and the sub current path can be made of the same material, the current sensor can be manufactured more easily.
  • the width of the main current path may be narrower than the width of the sub current path. According to this configuration, the distance between the first magnetosensitive element and the second magnetosensitive element can be further reduced, the current sensor can be reduced in size, and noise can be placed near the current sensor. The influence of the external magnetic field with the source can also be effectively canceled by the differential processing, and the measurement accuracy can be improved.
  • the current path has a flat plate shape, and the region includes a pair of slits formed in a direction parallel to a direction in which current flows through the main current path and the sub current path. You may comprise by forming in an electric current path.
  • each of the main current path and the sub current path has a flat plate shape, and the current path is configured by connecting the surface of the main current path and the surface of the sub current path. In the region, the main current path and the sub current path may be spaced apart.
  • the current sensor of the present invention includes a main current path and a current path including a region formed by a pair of sub current paths arranged in parallel at intervals on both sides of the main current path; A pair of magnetosensitive elements provided between the current path and each sub-current path, and an arithmetic circuit that calculates the current value of the main current path based on the detection value of the pair of magnetosensitive elements.
  • the strength of the magnetic field generated by the pair of sub-current paths is the same and the direction of the magnetic field is opposite, the strength of the magnetic field generated by the main current path and the strength of the magnetic field generated by the sub-current path Are different.
  • the intensity of the magnetic field applied to the pair of magnetosensitive elements by the main current path is different from the intensity of the magnetic field applied to the pair of magnetosensitive elements by the sub current path, so that the induced magnetic field due to the current to be measured cancels out. There is no end to it.
  • the magnetosensitive element reliably detects the induced magnetic field due to the current to be measured. can do.
  • the measurement accuracy of the current value of the current path can be maintained without increasing the distance between the pair of magnetosensitive elements, and the current sensor can be downsized.
  • a current sensor that eliminates the influence of an external magnetic field by performing arithmetic processing on detection values of two magnetosensitive elements, a current sensor that can be reduced in size while maintaining current measurement accuracy is provided. it can.
  • FIG. 4 is a schematic diagram showing a current sensor according to Embodiment 1.
  • FIG. 3 is a circuit diagram illustrating an example of a current sensor according to Embodiment 1.
  • FIG. 6 is a schematic diagram showing a current sensor according to Embodiment 2.
  • FIG. 6 is a schematic diagram showing a current sensor according to Embodiment 3.
  • FIG. 6 is a schematic diagram showing a current sensor according to a fourth embodiment. It is a schematic diagram which shows the current sensor which concerns on a modification.
  • the present inventor has a plurality of current paths branched when canceling the influence of the disturbance magnetic field.
  • this inventor makes resistance value between several electric current paths differ in view of not being able to reduce in size, if a difference is provided between induction magnetic fields by adjusting the distance between a magnetosensitive element and an electric current path. As a result, it was found that a difference can be provided between the induction magnetic fields, and the present invention has been achieved.
  • the essence of the present invention is that the main current path and the main current path of the type of current sensor that eliminates the influence of the disturbance magnetic field by calculating (difference or sum) the detection values of the two magnetosensitive elements.
  • a current path including a region composed of a pair of sub-current paths arranged in parallel at intervals on both sides, and in this region, a pair of magnetosensitive elements is provided between the current path and each sub-current path.
  • the resistance value of the pair of sub current paths is made equal, and the resistance value of the main current path is made different from the resistance value of the pair of sub current paths, thereby reducing the size while maintaining the current measurement accuracy.
  • FIG. 1 is a schematic diagram showing a current sensor 1 of the present embodiment.
  • 1A is a top view of the current sensor 1
  • FIG. 1B is a cross-sectional view taken along line IB-IB in FIG. 1A.
  • a current sensor 1 includes a current path 2 in which a pair of openings 2a and 2b are formed in a plate-shaped conductor, and magnetosensitive elements 3a and 3b disposed in the openings 2a and 2b, respectively. It is equipped with.
  • the pair of openings 2a and 2b are connected to the current path 2 in a direction parallel to the direction in which current flows through the current path 2 (particularly the main current path and the sub current path). It is a pair of formed slits.
  • the current path 2 has a pair of sub-currents arranged in parallel with the openings 2 a and 2 b on both sides of the main current path 21 and the main current path 21. Branches to current paths 22 and 23.
  • the main current path 21 and the pair of sub current paths 22 and 23 form a current path region R.
  • the current path 2 includes a main current path 21 and sub-current paths 22 and 23 that are arranged in parallel at intervals on both sides of the main current path 21.
  • the current flowing through the current path 2 includes a current flowing through the main current path 21 (hereinafter referred to as main current) I, a current flowing through the sub current path 22 (hereinafter referred to as sub current) I2, and a sub current.
  • the current is divided into three currents (hereinafter referred to as subcurrents) I3 flowing through the path 23.
  • the current sensor 1 shown in FIG. 1A is configured such that the resistance values of the auxiliary current paths 22 and 23 are equal, and the resistance values of the auxiliary current paths 22 and 23 and the resistance value of the main current path 21 are different.
  • the resistance value is different between the main current path 21 and the sub current paths 22 and 23
  • the cross sectional area of the main current path 21 and the cross section area of the sub current paths 22 and 23 may be different from each other.
  • the material of the main current path 21 and the material of the sub current paths 22 and 23 may be different. In the current sensor 1 shown in FIG.
  • the cross-sectional areas of the sub-current paths 22 and 23 are made equal, and the cross-sectional area of the sub-current paths 22 and 23 is made larger than the cross-sectional area of the main current path 21. Therefore, the current values of the subcurrents I2 and I3 flowing through the subcurrent paths 22 and 23 are equalized, and the main current I1 flowing through the main current path 21 and the subcurrents I2 and I3 flowing through the subcurrents 22 and 23 are equalized. Are different from each other (I1> I2, I3 or I1 ⁇ I2, I3). For this reason, the strength of the magnetic field generated by the main current path 21 is different from the strength of the magnetic field generated by the sub current paths 23 and 23.
  • the cross-sectional area is appropriately adjusted by changing the width (X direction) and thickness (Z direction) in FIG. 1B. By changing the cross-sectional area in this way, the current sensor 1 can be easily manufactured. Further, when the material of the main current path 21 and the material of the sub current paths 22 and 23 are different, the cross sectional area of the main current path 21 and the cross sectional area of the sub current paths 22 and 23 can be made equal.
  • the induced magnetic field B1 of the main current path 21 And the induced magnetic fields B2 and B3 of the auxiliary current paths 22 and 23 can be increased, so that even if the current I to be measured is a large current of several hundred A level, the magnetosensitive The elements 3a and 3b can be prevented from being magnetically saturated, and current can be measured accurately.
  • the magnetosensitive elements 3a and 3b are provided between the main current path 21 and the sub current paths 22 and 23, respectively.
  • the magnetic sensitive elements 3 a and 3 b are arranged at positions symmetrical with respect to the center of the main current path 21.
  • the magnetosensitive elements 3a and 3b include a direction in which the main current path 21 and the sub current paths 22 and 23 are arranged (the X direction in FIG. 1B), the main current path 21 and They are arranged so as to have a sensitivity axis in a direction parallel to a direction (Z direction in FIG. 1B) orthogonal to a direction (Y direction in FIG.
  • the magnetic sensitive elements 3a and 3b have sensitivity axis directions 32a and 32b, respectively.
  • the magnetosensitive elements 3a and 3b are arranged so that the sensitivity axis directions 32a and 32b are in the same direction, but are arranged so that the sensitivity axis directions 32a and 32b are opposite to each other. Also good.
  • the magnetic sensitive elements 3 a and 3 b have sensitivity axis directions 32 a and 32 b parallel to the pair of main surfaces 31.
  • the magnetic sensitive element 3 a has one main surface 31 in contact with the side surface 211 of the main current path 21.
  • the magnetic sensitive element 3b is arranged such that one main surface 31 is in contact with the side surface 212 of the main current path 21.
  • one main surface 31 is the side surface 221 of the sub-current path 22 so that the induced magnetic field B2 oriented parallel to the side surface 221 of the sub-current path 22 can be easily detected.
  • one main surface 31 is a side surface of the sub-current path 23 so that the induced magnetic field B3 oriented parallel to the side surface 231 of the sub-current path 23 can be easily detected.
  • 231 may be arranged so as to be in contact with 231.
  • the sensitivity axes of the sensitivity elements 3a and 3b are such that the current passes through the main current path 21 and the sub current paths 22 and 23 (the X direction in FIG. 1B) and the main current path 21 and the sub current path 22.
  • the sensitivity is maximized when the direction is parallel to the direction (Z direction in FIG. 1B) perpendicular to the flowing direction (Y direction in FIG. 1B), but is not limited thereto.
  • the sensitivity axes of the sensitivity elements 3a and 3b are on the YZ plane (excluding the Y direction) in FIG. 1B and are in any direction as long as the pair of sensitivity elements 3a and 3b are parallel to each other. May be.
  • the direction of the induced magnetic field B1 in the main current path 21 is opposite to the direction of the induced magnetic field B3 in the subcurrent path 23 (downward in FIG. 1B).
  • the magnetosensitive element 3b detects the combined induction magnetic field b (B1-B3) canceled by the induction magnetic field B3 of the sub current path 23.
  • the magnetosensitive elements 3a and 3b detect the combined induction magnetic fields canceled by the induction magnetic fields B2 and B3 of the sub current paths 22 and 23, respectively. Further, as will be described in detail later, the disturbance magnetic field in the direction parallel to the sensitivity axis directions 32a and 32b of the magnetic sensitive elements 3a and 3b can be canceled by the differential operation of the magnetic sensitive elements 3a and 3b. The influence of the disturbance magnetic field can be eliminated.
  • the magnetosensitive elements 3a and 3b for example, a magnetoresistive element such as a GMR (Giant Magneto Resistance) element or a TMR (Tunnel Magneto Resistance) element, a magnetic sensor using a Hall element, or the like can be applied.
  • the magnetoresistive effect element has a sensitivity axis parallel to the pair of main surfaces 31 of the magnetosensitive elements 3a and 3b.
  • the openings 2a and 2b of the current path 2 are arranged. Since the induced magnetic field B1 can be detected by providing it on the side surface of the current path, it is preferable in terms of ease of mounting.
  • FIG. 2 is a circuit diagram showing a current sensor according to the present invention.
  • the current sensor shown in FIG. 2 is a signal processing circuit (arithmetic circuit) that outputs a pair of magnetic sensitive elements 3a and 3b and signal processing (current value is calculated) of detection results from the magnetic sensitive elements 3a and 3b. 4.
  • the magnetosensitive element 3 a detects the combined induction magnetic field a canceled by the induction magnetic field B 2 of the sub current path 22, and a voltage signal having a magnitude proportional to the detected magnetic field is output to the signal processing circuit 4.
  • a voltage signal having a magnitude proportional to the detected magnetic field is output to the signal processing circuit 4.
  • the voltage signal Va output from the magnetosensitive element 3a is expressed by equation (1), where k is a proportional constant.
  • the magnetic field in the same direction as the sensitivity axis direction of the magnetic sensing element 3a is +, and the magnetic field in the opposite direction is-.
  • Va k * ⁇ ( ⁇ B1 + B2) ⁇ B ⁇ (1)
  • the magnetosensitive element 3 b detects the combined induction magnetic field b canceled by the induction magnetic field B 3 of the sub current path 23, and a voltage signal having a magnitude proportional to the detected magnetic field is output to the signal processing circuit 4.
  • the voltage signal Vb output from the magnetosensitive element 3b is expressed by equation (2), where k is a proportional constant.
  • the magnetic field in the same direction as the sensitivity axis direction of the magnetosensitive element 3b is +, and the magnetic field in the opposite direction is-.
  • Vb k * ⁇ (B1-B3) -B ⁇ (2)
  • the signal processing circuit 4 performs arithmetic processing on the voltage signals Va and Vb output from the magnetic sensitive elements 3a and 3b. Specifically, as shown in FIG. 1B, when the magnetic sensitive elements 3a and 3b are arranged so that the sensitivity axis directions 32a and 32b are in the same direction, the signal processing circuit 4 includes the magnetic sensitive elements 3a and 3b. Is subtracted as shown in the equation (3) to calculate the current value of the main current I1 flowing through the main current path 21.
  • the external magnetic field B ⁇ is canceled by subtracting the voltage signals Va and Vb.
  • the influence of the external magnetic field B ⁇ can be eliminated, and the current value measurement accuracy can be improved.
  • the result of the expression (3) is also proportional to the measured current, and the signal processing circuit 4 determines the measured current (that is, the current path 2). It is possible to easily calculate the total current).
  • the signal processing circuit 4 adds the signals output from the magnetic sensitive elements 3a and 3b. Then, the current value may be calculated.
  • the resistance values of the auxiliary current paths 22 and 23 are equal, and the resistance values of the auxiliary current paths 22 and 23 and the resistance value of the main current path 21 are different. Composed.
  • a current is generated by using an induction magnetic field which is a difference between an induction magnetic field generated by the main current flowing through the main current path 21 and an induction magnetic field generated by the sub current flowing through the sub current paths 22 and 23.
  • the difference between the induced magnetic field is not generated by using the distance between the magnetosensitive element and the current path, but the difference is determined by the intensity difference of the induced magnetic field between the main current path and the sub current path.
  • the magnetic sensitive elements 3a and 3b may be arranged symmetrically with respect to the center of the main current path 21 between the main current path 21 and the sub current paths 22 and 23. High positional accuracy in mounting is not required. Further, the influence of the external magnetic field B ⁇ can be canceled by differential processing by the pair of magnetosensitive elements 3a and 3b. As a result, the current value measurement accuracy can be maintained and the current sensor 1 can be miniaturized without increasing the distance between the magnetosensitive element 3a and the magnetosensitive element 3b.
  • FIG. 3 is a schematic diagram showing the current sensor 1 of the present embodiment.
  • 3A is a top view of the current sensor 1
  • FIG. 3B is a cross-sectional view taken along line IIIB-IIIB in FIG. 3A.
  • the current sensor 1 includes a current path 2 in which slit-like openings 2a and 2b are formed in a plate-shaped conductor, and magnetosensitive elements 3a and 3b arranged in the openings 2a and 2b, respectively.
  • the current sensor 1 shown in FIG. 1 and the current sensor shown in FIG. 3 are common.
  • the difference between the current sensor 1 shown in FIG. 1 and the current sensor shown in FIG. 3 is the arrangement position of the magnetosensitive elements 3a and 3b due to the difference in the sensitivity axis direction of the magnetosensitive elements 3a and 3b.
  • the magnetic sensitive elements 3a and 3b are arranged in the direction in which the main current path 21 and the sub current paths 22 and 23 are arranged (X direction in FIG. 3B), and in the main current path 21 and the sub current path 22. They are arranged so as to have a sensitivity axis in a direction parallel to a direction (Z direction in FIG. 3B) orthogonal to a direction in which current flows (Y direction in FIG. 3B). That is, the magnetic sensitive elements 3a and 3b have sensitivity axis directions 32a and 32b, respectively.
  • X direction in FIG. 3B the direction in which the main current path 21 and the sub current paths 22 and 23 are arranged
  • the magnetic sensitive elements 3a and 3b are arranged so that the sensitivity axis directions 32a and 32b are in the same direction, but are arranged so that the sensitivity axis directions 32a and 32b are opposite to each other. Also good.
  • the magnetic sensitive elements 3a and 3b have sensitivity axis directions 32a and 32b in a direction orthogonal to the pair of main surfaces 31 like Hall elements. For this reason, it is preferable to arrange
  • the magnetic sensing elements 3a and 3b are configured such that the lower main surface 31, the upper surface 213 of the main current path 21, and the upper surfaces 222 and 223 of the sub current paths 22 and 23 are substantially in the same plane. You may arrange
  • the magnetic sensitive elements 3 a and 3 b may be arranged such that the side surfaces thereof are in contact with the side surface 211 of the main current path 21 and the side surfaces 221 and 231 of the sub current paths 22 and 23.
  • the resistance values of the auxiliary current paths 22 and 23 are equal, and the resistance values of the auxiliary current paths 22 and 23 and the resistance value of the main current path 21 are different.
  • a current is generated by using an induction magnetic field which is a difference between an induction magnetic field generated by the main current flowing through the main current path 21 and an induction magnetic field generated by the sub current flowing through the sub current paths 22 and 23.
  • the difference between the induced magnetic field is not generated by using the distance between the magnetosensitive element and the current path, but the difference is determined by the intensity difference of the induced magnetic field between the main current path and the sub current path. Since it is generated, it is not necessary to provide an extra space for difference generation.
  • the magnetic sensitive elements 3a and 3b may be arranged symmetrically with respect to the center of the main current path 21 between the main current path 21 and the sub current paths 22 and 23. High positional accuracy in mounting is not required. Further, the influence of the external magnetic field B ⁇ can be canceled by differential processing by the pair of magnetosensitive elements 3a and 3b. As a result, the current value measurement accuracy can be maintained and the current sensor 1 can be miniaturized without increasing the distance between the magnetosensitive element 3a and the magnetosensitive element 3b.
  • FIG. 4 is a schematic diagram showing the current sensor 1 of the present embodiment.
  • 4A is a top view of the current sensor 1
  • FIG. 4B is a cross-sectional view taken along line IVB-IVB in FIG. 4A.
  • the current sensor 1 includes a current path 2 in which slit-like openings 2a and 2b are formed in a plate-shaped conductor, and magnetosensitive elements 3a and 3b arranged in the openings 2a and 2b, respectively.
  • the current sensor 1 shown in FIG. 1 and the current sensor shown in FIG. 4 are common.
  • the difference between the current sensor 1 shown in FIG. 1 and the current sensor shown in FIG. 4 is that the width of the main current path 21 is considerably smaller than the width of the sub current paths 22 and 23.
  • the magnetosensitive elements 3a and 3b detect the combined induction magnetic fields canceled by the induction magnetic fields B2 and B3 of the sub current paths 22 and 23, respectively.
  • the noise source is very far like geomagnetism, and the external magnetic field can be canceled by differential, not to mention that the external magnetic field affects the magnetic sensing elements 3a and 3b in parallel with the same intensity.
  • the external magnetic field generated by the noise source is substantially applied to the magnetosensitive elements 3a and 3b. It has the same effect and can be canceled by differential.
  • the distance between the magnetic sensing element 3a and the sub current path 23 is considerably smaller than that shown in FIG. 1B.
  • the magnetosensitive elements 3a and 3b are affected to the same extent by the induced magnetic field B3 of the sub current path 23.
  • Va k * ⁇ B1 + (B2 ⁇ B3 ′) + B ⁇ (1)
  • Vb k * ⁇ B1 + ( ⁇ B3 + B2 ′) + B ⁇ (2) ′
  • the width of the main current path 21 only needs to cancel the noise source in the vicinity of the main current path 21 and can be appropriately determined depending on the magnitude of the current to be measured, the type of the noise source in the vicinity of the main current path 21, and the like.
  • the resistance values of the auxiliary current paths 22 and 23 are equal, and the resistance values of the auxiliary current paths 22 and 23 and the resistance value of the main current path 21 are different.
  • the induced magnetic field is generated by using the induced magnetic field which is the difference between the induced magnetic field generated by the main current flowing through the main current path 21 and the induced magnetic field generated by the subcurrent flowing through the auxiliary current paths 22 and 23.
  • Current measurements can be made.
  • the distance between the magnetic sensing elements 3a and 3b can be further reduced by making the width of the main current path 21 smaller than the width of the sub current paths 22 and 23,
  • the current sensor 1 can be further downsized.
  • the influence of the noise source near the main current path here the adjacent current path, can be eliminated without reducing the signal of the current to be measured. The ratio can be improved.
  • FIG. 5 is a schematic diagram showing the current sensor 1 of the present embodiment.
  • 5A is a top view of the current sensor 1
  • FIG. 5B is a cross-sectional view taken along the line VB-VB in FIG. 5A.
  • the difference between the current sensor 1 shown in FIG. 1 and the current sensor 1 shown in FIG. 5 is the method of forming the openings 2a and 2b.
  • the current sensor 1 has a current path region R including a main current path 21 which is a flat conductor and a pair of sub current paths 22 and 23 which are flat conductors. At both ends of the current path 2 of the current sensor 1, the surface of the main current path 21 and the surfaces of the sub current paths 22 and 23 are connected. Further, in the region R formed of the central portion of the main current path 21 and the sub current paths 22 and 23, the main current path 21 and the sub current paths 22 and 23 are arranged with an interval.
  • the magnetosensitive elements 3a and 3b are arranged in the direction in which the main current path 21 and the sub current paths 22 and 23 are arranged (the X direction in FIG. 5B), and in the main current path 21 and the sub current path 22. They are arranged so as to have a sensitivity axis in a direction parallel to a direction (Z direction in FIG. 5B) orthogonal to a direction in which current flows (Y direction in FIG. 5B).
  • the magnetosensitive elements 3a and 3b detect the combined induction magnetic fields canceled by the induction magnetic fields B2 and B3 of the sub current paths 22 and 23, respectively.
  • the main current path 21 and the sub current paths 22 and 23 are configured by conductors having a rectangular cross section that is long in the height direction (Z direction) in a cross-sectional view.
  • the magnetic field B1 has more parallel components with respect to the side surface 211 of the main current path 21 than in the case shown in FIG. 1B. For this reason, compared with the case shown in FIG. 1B, the magnetic sensitive elements 3a and 3b can easily detect the induced magnetic field B1 of the main current path 2.
  • the width of the entire current path 2 including the main current path 21 and the sub current paths 22 and 23 can be further reduced, and the current sensor 1 can be reduced in size.
  • the current path 2 is formed by connecting the three conductors of the main current path 21 and the sub current paths 22 and 23, one current path 2 is branched into three current paths as shown in FIG. 1A. Compared to the case, it can be easily manufactured.
  • the resistance values of the auxiliary current paths 22 and 23 are equal, and the resistance values of the auxiliary current paths 22 and 23 and the resistance value of the main current path 21 are different.
  • a combined induction magnetic field that is a difference between the induction magnetic field generated by the main current flowing through the main current path 21 and the induction magnetic field generated by the sub current flowing through the sub current paths 22 and 23 is used. Current measurements can be made.
  • FIG. 6 is a diagram illustrating a modification of the present embodiment.
  • the current sensor 1 according to the present embodiment includes a main current path 21 made of a current line having a circular cross section and sub-current paths 22 and 23 made of a current line having a circular cross section. Also good.
  • the main current path 21 and the sub current paths 22, 23 are arranged at an interval in a region R formed of the central portion of the main current path 21 and the sub current paths 22, 23.
  • the main current path 21 and the sub current paths 22 and 23 are connected to each other at both ends of the main current path 21 and the sub current paths 22 and 23.
  • the resistance values of the auxiliary current paths 22 and 23 are equal, and the resistance values of the auxiliary current paths 22 and 23 and the resistance value of the main current path 21 are different.
  • a combined induction magnetic field that is a difference between the induction magnetic field generated by the main current flowing through the main current path 21 and the induction magnetic field generated by the sub current flowing through the sub current paths 22 and 23 is used. Current measurements can be made.
  • Embodiments 1 to 4 above can be implemented in combination as appropriate.
  • the arrangement, size, and the like of each component in the above embodiment can be changed as appropriate.
  • the present invention can be implemented with appropriate modifications without departing from the scope of the present invention.
  • the resistance values of the pair of sub current paths are made equal, and the resistance values of the pair of sub current paths are different from the resistance values of the main current path.
  • the present invention is not limited to this configuration.
  • the strength of the magnetic field generated by the pair of sub current paths is the same, the direction of the magnetic field is opposite, and the strength of the magnetic field generated by the main current path and the magnetic field generated by the sub current path are You may make it differ in strength.
  • the intensity of the magnetic field applied to the pair of magneto-sensitive elements by the main current path is different from the intensity of the magnetic field applied to the pair of magneto-sensitive elements by the sub current path. There is no end to it. Therefore, as in the first to fourth embodiments, a current sensor that can be miniaturized while maintaining the measurement accuracy of the current value can be realized.
  • the current sensor of the present invention can be used, for example, to detect the magnitude of a current for driving a motor of an electric vehicle or a hybrid car.

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

Abstract

La présente invention porte sur un capteur de courant électrique dans lequel un processus de calcul est réalisé sur des valeurs de détection de deux éléments de détection magnétiques, ce par quoi l'effet d'un champ magnétique extérieur est éliminé, le capteur pouvant être réalisé plus compact sans sacrifier la précision avec laquelle une valeur de courant électrique est mesurée. Ce capteur de courant électrique (1) comporte un trajet de courant électrique (2) comprenant une région (R) formée par un trajet principal de courant électrique (21) et une paire de trajets secondaires de courant électrique (22, 23) agencés en parallèle de part et d'autre d'un intervalle sur chaque côté du trajet principal de courant électrique (21), une paire d'éléments de détection magnétiques (3a, 3b) disposés entre le trajet principal de courant électrique (21) et chacun des trajets secondaires de courant électrique (22, 23) dans la région (R), et un circuit de calcul pour calculer une valeur de courant électrique du trajet principal de courant électrique (21) sur la base de valeurs de détection en provenance de la paire d'éléments de détection magnétiques (3a, 3b). Les valeurs de résistance de la paire de trajets secondaires de courant électrique (22, 23) sont égales et la valeur de résistance du trajet principal de courant électrique (21) est différente des valeurs de résistance de la paire de trajets secondaires de courant électrique (22, 23).
PCT/JP2012/070817 2011-09-13 2012-08-16 Capteur de courant électrique WO2013038867A1 (fr)

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JP2011199340 2011-09-13

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015089122A1 (fr) * 2013-12-11 2015-06-18 Eaton Corporation Appareil de détection de courant électrique
JP2015137894A (ja) * 2014-01-21 2015-07-30 日立金属株式会社 電流検出構造
JP2015137892A (ja) * 2014-01-21 2015-07-30 日立金属株式会社 電流検出構造
WO2016002501A1 (fr) * 2014-07-02 2016-01-07 株式会社村田製作所 Capteur de courant
WO2018021082A1 (fr) * 2016-07-26 2018-02-01 株式会社デンソー Capteur de courant
DE102019114554B3 (de) * 2019-05-29 2020-09-24 Infineon Technologies Ag Stromschiene und Leistungsmodul mit Stromschiene
JP2024522898A (ja) * 2021-06-28 2024-06-21 ルーテック インコーポレイテッド 大電流計測装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5512497A (en) * 1978-07-11 1980-01-29 Westinghouse Electric Corp Electric current detection converter
JP2002202328A (ja) * 2000-12-28 2002-07-19 Japan System Engineering Kk 磁界型電流センサ
JP2006184269A (ja) * 2004-12-02 2006-07-13 Yazaki Corp 電流センサ
JP2008216230A (ja) * 2007-03-02 2008-09-18 Koshin Denki Kk 電流センサ

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5512497A (en) * 1978-07-11 1980-01-29 Westinghouse Electric Corp Electric current detection converter
JP2002202328A (ja) * 2000-12-28 2002-07-19 Japan System Engineering Kk 磁界型電流センサ
JP2006184269A (ja) * 2004-12-02 2006-07-13 Yazaki Corp 電流センサ
JP2008216230A (ja) * 2007-03-02 2008-09-18 Koshin Denki Kk 電流センサ

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105981126A (zh) * 2013-12-11 2016-09-28 伊顿公司 电流感测设备
CN105981126B (zh) * 2013-12-11 2018-11-02 伊顿公司 电流感测设备
US9746500B2 (en) 2013-12-11 2017-08-29 Eaton Corporation Electrical current sensing apparatus
WO2015089122A1 (fr) * 2013-12-11 2015-06-18 Eaton Corporation Appareil de détection de courant électrique
US9513317B2 (en) 2014-01-21 2016-12-06 Hitachi Metals, Ltd. Current detection structure
EP2899551A3 (fr) * 2014-01-21 2015-08-12 Hitachi Metals, Ltd. Structure de détection de courant
JP2015137892A (ja) * 2014-01-21 2015-07-30 日立金属株式会社 電流検出構造
JP2015137894A (ja) * 2014-01-21 2015-07-30 日立金属株式会社 電流検出構造
WO2016002501A1 (fr) * 2014-07-02 2016-01-07 株式会社村田製作所 Capteur de courant
JPWO2016002501A1 (ja) * 2014-07-02 2017-04-27 株式会社村田製作所 電流センサ
WO2018021082A1 (fr) * 2016-07-26 2018-02-01 株式会社デンソー Capteur de courant
DE102019114554B3 (de) * 2019-05-29 2020-09-24 Infineon Technologies Ag Stromschiene und Leistungsmodul mit Stromschiene
US11796571B2 (en) 2019-05-29 2023-10-24 Infineon Technologies Ag Busbar and power module with busbar
JP2024522898A (ja) * 2021-06-28 2024-06-21 ルーテック インコーポレイテッド 大電流計測装置

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