WO2012029439A1 - Détecteur de courant - Google Patents

Détecteur de courant Download PDF

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Publication number
WO2012029439A1
WO2012029439A1 PCT/JP2011/066811 JP2011066811W WO2012029439A1 WO 2012029439 A1 WO2012029439 A1 WO 2012029439A1 JP 2011066811 W JP2011066811 W JP 2011066811W WO 2012029439 A1 WO2012029439 A1 WO 2012029439A1
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WO
WIPO (PCT)
Prior art keywords
magnetic sensor
magnetic
current
sensor
conductive member
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PCT/JP2011/066811
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English (en)
Japanese (ja)
Inventor
学 田村
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アルプス・グリーンデバイス株式会社
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Application filed by アルプス・グリーンデバイス株式会社 filed Critical アルプス・グリーンデバイス株式会社
Priority to JP2012531747A priority Critical patent/JP5487403B2/ja
Publication of WO2012029439A1 publication Critical patent/WO2012029439A1/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 measures the magnitude of a current, and more particularly, to a current sensor that detects a current flowing through a conductor via a magnetoelectric conversion element.
  • a current sensor As a current sensor having a wide measurement range, a current sensor has been proposed in which two magnetic sensors are arranged at positions where the distance from a conductor is changed, and current values are measured at locations where the strength of the magnetic field generated by the current is different. (For example, refer to Patent Document 1). In addition, a pair of magneto-impedance elements as magnetic high-sensitivity elements are placed opposite to each other with a current line passing through the current to be detected, and the voltage generated in the pair of magnetic impedances is added to stably measure a minute current. A current sensor has been proposed (see, for example, Patent Document 2).
  • the current sensor described in Patent Document 1 it is necessary to increase the distance from the conductor in order to obtain a wide measurement range, so that the necessary space increases. Also, if the magnetic sensor is too far away from the conductor, the noise generated between the magnetic sensors will be different, so that it is difficult to take countermeasures. In addition, the current sensor described in Patent Document 2 has a problem that a measurement error of a detected current occurs due to an error in the distance between a pair of magnetic impedances and a current line.
  • the present invention has been made in view of the above points, and an object of the present invention is to provide a current sensor that can measure a wide range of currents to be measured and can reduce noise due to disturbance magnetism.
  • the current sensor of the present invention includes a first magnetic sensor and a second magnetic sensor that output an output signal by an induced magnetic field from a current to be measured, an output signal of the first magnetic sensor, and the second magnetic sensor.
  • a differential unit that performs a differential operation on an output signal; and a switching control unit that switches connection between the first magnetic sensor and the second magnetic sensor and the differential unit, the first magnetic sensor And the second magnetic sensor is arranged such that the sensitivity axis direction is fixed in the same direction and the distance from the central point of the conductive member through which the current to be measured flows is different from each other, and the switching control
  • the means determines whether an output signal of the first magnetic sensor or the second magnetic sensor is larger than a predetermined threshold value, and the first magnetic sensor and the second magnetic sensor according to the determination result, and the Switching the connection with the differential unit And features.
  • the measured current when the measured current is a small current, the measured current can be measured by differentially calculating the output signals of the first magnetic sensor and the second magnetic sensor, and the measured current is a large current.
  • the current to be measured can be measured by the first magnetic sensor or the second magnetic sensor having a relatively low detection sensitivity.
  • the current to be measured when the current to be measured is a small current, noise due to disturbance magnetism included in the output signals of the first magnetic sensor and the second magnetic sensor is canceled, and the measurement accuracy is improved.
  • Even in the case of a large current magnetic saturation of the first magnetic sensor or the second magnetic sensor used for measuring the current to be measured can be suppressed. Therefore, it is possible to realize a current sensor that can measure a wide range of currents to be measured and can reduce the influence of noise due to disturbance magnetism.
  • the first magnetic sensor and the second magnetic sensor have a distance between the first magnetic sensor and a center point of the conductive member that is the same as the second magnetic sensor and the second magnetic sensor.
  • the switching control means is arranged so as to be smaller than the distance between the central point of the conductive member.
  • the second magnetic sensor is connected to the differential unit. It is preferable.
  • the measured current when the measured current is small, the measured current is measured by differential calculation of the output signals of the first magnetic sensor and the second magnetic sensor. Can be reduced. Further, when the current value of the current to be measured increases and the output signal of the first magnetic sensor exceeds a predetermined threshold value, the first magnetic sensor is installed away from the center of the conductive member. Since the current to be measured is measured by the second magnetic sensor, the magnetic saturation of the second magnetic sensor can be suppressed. Therefore, it is possible to realize a current sensor that can measure a wide range of currents to be measured and can reduce the influence of noise due to disturbance magnetism.
  • the first magnetic sensor and the second magnetic sensor include a sensitivity axis direction of the first magnetic sensor and an application direction of the induction magnetic field applied to the first magnetic sensor. Is preferably arranged to be smaller than an angle ⁇ 2 formed between the sensitivity axis direction of the second magnetic sensor and the application direction of the induction magnetic field applied to the second magnetic sensor.
  • the magnetic vector of the induced magnetic field from the measured current applied to the second magnetic sensor is equal to the magnetic vector of the induced magnetic field from the measured current applied to the first magnetic sensor. Becomes smaller than Thereby, even when the current to be measured is a large current, it is possible to suppress the magnetic saturation of the second magnetic sensor.
  • the current sensor of the present invention includes a substrate on which the first magnetic sensor and the second magnetic sensor are disposed, and the conductive member has a major axis direction and a minor axis direction in a cross-sectional view.
  • the substrate is arranged in parallel with the conductive member in the minor axis direction of the conductive member, and is arranged so that the in-plane direction of the substrate and the major axis direction coincide with each other.
  • the current sensor can be reduced in size and thickness.
  • the current sensor can be manufactured without individually adjusting the distances between the first magnetic sensor and the second magnetic sensor and the conductive member, the current sensor can be easily manufactured.
  • the conductive member has a rectangular shape in a sectional view. According to this configuration, the change in the application direction of the induced magnetic field in the vicinity of the end portion in the short axis direction of the conductive member becomes large, so that the difference in magnetic vector in the sensitivity axis direction between the first magnetic sensor and the second magnetic sensor is reduced. Can be bigger. As a result, magnetic saturation of the second magnetic sensor can be suppressed, and measurement of a large current to be measured becomes possible.
  • the first magnetic sensor and the second magnetic sensor are GMR elements.
  • a current sensor that can measure a wide range of measured currents and can reduce noise due to disturbance magnetism.
  • FIG. 1 is a schematic plan view of the current sensor according to the present embodiment.
  • the current sensor 1 according to the present embodiment includes a case 11 having a space inside, and a conductive member 12 that is partially disposed in the case 11 and extends in one direction.
  • a pair of first and second magnetic sensors 14 a, 14 b that output an output signal through a substrate 13 by an induced magnetic field M 1 (see FIG. 4) from the current I to be measured. Is placed.
  • the first and second magnetic sensors 14a and 14b used for measuring the measured current I are switched according to the magnitude of the measured current I while passing through the conductive member 12. The current I to be measured I is measured.
  • FIG. 2 is a schematic cross-sectional view of the current sensor 1 according to the present embodiment, and is a cross-sectional view taken along line AA in FIG.
  • the case 11 is formed of an insulator, but a part thereof is made of a material having high magnetic permeability such as silicon steel or permalloy, and shields disturbance magnetism into the case 11. It may be configured as follows.
  • the case 11 has a rectangular frame shape in a cross-sectional view, and the conductive member 12 is disposed so as to penetrate the case 11.
  • the conductive member 12 has a rectangular shape in a sectional view, and has a pair of main surfaces 12a and 12b at both ends in the minor axis direction D2, and a pair of end surfaces 12c and 12d at both ends in the major axis direction D3.
  • the current I to be measured is passed in one direction by the conductive member 12.
  • the substrate 13 is supported by a support member (not shown) between one main surface 12a in the major axis direction D3 of the conductive member 12 and the top plate 11a of the case 11.
  • the substrate 13 is arranged in parallel on the one main surface 12a side of the conductive member 12 so that the in-plane direction of the substrate 13 and the major axis direction D3 are parallel to each other.
  • the in-plane direction of the substrate 13 and the major axis direction D3 do not need to be completely parallel, and may be substantially parallel as long as the effects of the present invention are achieved.
  • the position of the midpoint P1 in the width direction is the position of the midpoint in the major axis direction D3 (width direction) of the conductive member 12 (center point P2 of the conductive member 12). It is preferable that they are arranged at the same position.
  • the position of the midpoint P1 in the width direction does not have to be completely the same as the position of the midpoint (center point P2 of the conductive member 12) in the long axis direction D3 (width direction) of the conductive member 12. It suffices if they are substantially the same as long as the above effect is achieved.
  • the midpoint P1 in the width direction and the midpoint in the major axis direction D3 of the conductive member 12 are aligned in the direction perpendicular to the substrate surface (see F1). Arrangement is more preferable from the viewpoint of miniaturization of the current sensor 1.
  • first and second magnetic sensors 14a and 14b On the substrate 13, there are provided first and second magnetic sensors 14a and 14b, and a control unit 21 (see FIG. 5) for calculating and processing output signals of the first and second magnetic sensors 14a and 14b.
  • the first magnetic sensor 14a is disposed at the center of the upper surface of the substrate 13 (near the midpoint P1), and the second magnetic sensor 14b is disposed at one end of the upper surface of the substrate 13.
  • the first and second magnetic sensors 14a and 14b are configured so that the sensitivity axis direction D1 is fixed in the same direction as the major axis direction D3 of the conductive member 12, and the detection sensitivity is the same.
  • the sensitivity axis direction D1 does not have to be completely the same as the major axis direction D3 of the conductive member 12, and may be substantially the same as long as the effect of the present invention is achieved.
  • FIG. 3 is an explanatory diagram of an induced magnetic field in the current sensor 1 according to the present embodiment
  • FIG. 4 is a partially enlarged view of the first and second magnetic sensors 14a and 14b shown in FIG.
  • FIG. 3 the cross-sectional schematic diagram of the current sensor 1 is shown, and the case 11 is omitted for convenience of explanation.
  • an induced magnetic field M ⁇ b> 1 is generated in a certain range from the outer periphery of the conductive member 12 with the conductive member 12 as the center.
  • the induction magnetic field M1 is in a clockwise direction with respect to the flow direction of the measured current I (from the front side to the back side). Therefore, in the vicinity of the central portion of one main surface 12a of the conductive member 12, the direction of the induced magnetic field M1 is rightward (leftward), and in the vicinity of the central portion of the other main surface 12b of the conductive member 12, induction is performed.
  • the direction of the magnetic field M1 is the left direction (right direction).
  • the direction of the induced magnetic field M1 changes in a curved shape in a cross-sectional view from one end side to the other end side of the end faces 12c and 12d.
  • the induced magnetic field M1 is applied in parallel to the sensitivity axis direction D1 to the first magnetic sensor 14a disposed in the vicinity of the central portion of the main surface 12a of the conductive member 12, and in the vicinity of the end surface 12c.
  • the induced magnetic field M1 is applied to the second magnetic sensor 14b disposed from an oblique direction with respect to the sensitivity axis direction D1.
  • the induction magnetic field M1 is applied from the same direction as the sensitivity axis direction D1 (right direction) to the first magnetic sensor 14a disposed in the vicinity of the central portion of the main surface 12a of the conductive member 12. Is done. Therefore, the sensitivity axis direction D1 of the first magnetic sensor 14a and the application direction of the induction magnetic field M1 are the same direction, and the angle ⁇ 1 formed by the sensitivity axis direction D1 of the first magnetic sensor 14a and the application direction of the induction magnetic field M1. Becomes a minute value.
  • the induced magnetic field M1 is applied to the second magnetic sensor 14b disposed in the vicinity of the end face 12c of the conductive member 12 from a direction that forms a predetermined angle ⁇ 2 with respect to the sensitivity axis direction D1. Therefore, the angle ⁇ 2 formed between the sensitivity axis direction D1 of the second magnetic sensor 14b and the application direction of the induction magnetic field M1 is the angle formed between the sensitivity axis direction D1 of the first magnetic sensor 14a and the application direction of the induction magnetic field M1. It becomes relatively larger than ⁇ 1.
  • the induced magnetic field M1 applied to the center point P3 of the first magnetic sensor 14a is vector-decomposed into a magnetic vector M2 in the sensitivity axis direction D1 and a magnetic vector M3 in a direction perpendicular to the surface of the substrate 13.
  • the angle ⁇ 1 formed by the induction magnetic field M1 and the sensitivity axis direction D1 is a minute value.
  • the magnitude of the induction magnetic field M1 and the magnitude of the magnetic vector M2 are substantially the same. For this reason, the output signal output from the first magnetic sensor 14a is an output signal corresponding to the magnitude of the induced magnetic field M1.
  • the induced magnetic field M1 applied to the center point P4 of the second magnetic sensor 14b is vector-decomposed into a magnetic vector M2 in the sensitivity axis direction D1 and a magnetic vector M3 perpendicular to the surface of the substrate 13.
  • the output signal output from the second magnetic sensor 14b is an output signal corresponding to the magnitude of the magnetic vector M2 obtained by vector decomposition of the induced magnetic field M1.
  • the first and second magnetic sensors 14a and 14b have the distance between the first magnetic sensor 14a and the center point P2 of the conductive member 12 being the second. It arrange
  • FIG. With this configuration, the induced magnetic field M1 from the current I to be measured is applied to the first and second magnetic sensors 14a and 14b as magnetic vectors M2 having different magnitudes.
  • the output signal output from the second magnetic sensor 14a is relatively larger than the output signal output from the second magnetic sensor 14b.
  • the measured current I when the measured current I is a small current, the measured current I can be measured by the first magnetic sensor 14a having relatively high detection sensitivity. Further, when the current I to be measured is a large current, the magnetic vector M2 of the induction magnetic field M1 is applied to the second magnetic sensor 14a, so that the magnetic saturation of the second magnetic sensor 14b can be suppressed. Become. Therefore, the measurement range of the current I to be measured can be expanded.
  • the sensitivity axis directions D1 of the first and second magnetic sensors 14a and 14b are fixed in the same direction, and the first and second magnetic fields from the same direction are first and second. Because the output signals output from the magnetic sensors 14a and 14b are the same, the same phase and the same output signal are output to the disturbance magnetic Hc. For this reason, the noise component is removed from the disturbance magnetism in the same phase by differentially calculating the output signals of the first and second magnetic sensors 14a and 14b. Therefore, the measurement accuracy of the current sensor 1 can be improved.
  • FIG. 5 is a functional block diagram showing the current sensor according to the embodiment of the present invention.
  • the first and second magnetic sensors 14a and 14b are magnetic balance sensors, respectively, and feedback coils 141a and 141b arranged so as to be able to generate a magnetic field in a direction to cancel the magnetic field generated by the current I to be measured. It is composed of two magnetoresistive effect elements, which are elements, and bridge circuits 142a and 142b composed of two fixed resistance elements.
  • the control unit 21 amplifies the differential output of the bridge circuit 142a of the first magnetic sensor 14a and controls the feedback current of the feedback coil 141a and the differential / current amplifier 211 and the feedback current of the first magnetic sensor 14a.
  • a differential / current amplifier 213 that amplifies the differential output of the bridge circuit 142b of the second magnetic sensor 14b and controls the feedback current of the feedback coil 141b;
  • I / V amplifier 214 that converts the feedback current of sensor 14b into voltage, first and second magnetic sensors 14a and 14b, and differential amplifier 222 according to the magnitude of the output signal from first magnetic sensor 14a
  • the switching control circuit 221 for switching the connection between the I / V amplifiers 212 and 214 is amplified.
  • a dynamic amplifier 222 is used to the differential output signal from first magnetic sensor 14a.
  • the feedback coils 141a and 141b are disposed in the vicinity of the magnetoresistive effect elements of the bridge circuits 142a and 142b, and generate a canceling magnetic field that cancels the induced magnetic field generated by the current I to be measured.
  • the magnetoresistive effect elements of the bridge circuits 142a and 142b include a GMR (Giant Magneto Resistance) element and a TMR (Tunnel Magneto Resistance) element.
  • the resistance value of the magnetoresistive effect element changes when an induction magnetic field is applied from the current I to be measured.
  • the bridge circuits 142a and 142b have two outputs that generate a voltage difference according to the induced magnetic field M1 generated by the current I to be measured.
  • the two outputs of the bridge circuits 142a and 142b are amplified by the differential / current amplifiers 211 and 213, and the amplified outputs are supplied to the feedback coils 141a and 141b as currents (feedback currents).
  • This feedback current corresponds to a voltage difference corresponding to the induced magnetic field M1.
  • a cancellation magnetic field that cancels the induction magnetic field M1 is generated in the feedback coils 141a and 141b.
  • the currents that flow through the feedback coils 141a and 141b when the induced magnetic field M1 and the canceling magnetic field cancel each other are converted into voltages by the I / V amplifiers 212 and 214, and this voltage becomes the sensor output.
  • the feedback current is set by setting the power supply voltage to a value close to the reference voltage for I / V conversion (maximum value within the rated value of feedback coil resistance ⁇ feedback coil current at full scale). Is automatically limited, and the effect of protecting the magnetoresistive effect element and the feedback coil can be obtained.
  • the differential of the two outputs of the bridge circuits 142a and 142b is amplified and used as a feedback current. However, only the midpoint potential is output from the bridge circuit and based on the potential difference from a predetermined reference potential. It may be a feedback current.
  • the switching control circuit 221 includes a determination circuit that determines whether or not the magnitude of the output signal from the first magnetic sensor 14a is greater than a predetermined threshold, and the magnitude of the output signal of the first magnetic sensor 14a. Accordingly, the connection between the I / V amplifier 212 and the I / V amplifier 214 and the differential amplifier 222 is switched. When the output signal of the first magnetic sensor 14a is smaller than a predetermined threshold, the switching control circuit 221 connects the I / V amplifiers 212 and 214 to the differential amplifier 222, and the first and second magnetic sensors. The output signals from 14a and 14b are output to the differential amplifier 222 together. Further, when the output signal of the first magnetic sensor 14b is larger than a predetermined threshold, the switching control circuit 221 connects the I / V amplifier 214 to the differential amplifier 222 and outputs from the second magnetic sensor 14b. Output a signal.
  • the differential amplifier 222 amplifies the output signal of the I / V amplifier 212 with a reference voltage and processes it as a sensor output, and processes the differential value of the output signals of the I / V amplifiers 212 and 214 as a sensor output. To do. By performing such processing, the influence of an external magnetic field such as geomagnetism on the output signals of the first magnetic sensor 14a and the second magnetic sensor 14b is canceled, and the current can be measured with higher accuracy.
  • FIG. 6 is a flowchart showing an operation example of the current sensor according to the present embodiment.
  • step ST1 the measured current I is measured using both the first and second magnetic sensors 14a and 14b (step ST2).
  • step ST2 it is determined by the determination circuit of the switching control circuit 221 whether the magnitude of the output signal of the first magnetic sensor 14a is larger than a predetermined threshold (step ST2).
  • step ST2 when the output signal of the first magnetic sensor 14a is smaller than a predetermined threshold value, the measured current I is measured using both the first and second magnetic sensors 14a and 14b (step ST1).
  • step ST3 the measured current I is measured using the second magnetic sensor 14b (step ST3).
  • the determination circuit of the switching control circuit 221 determines whether or not the output signal of the first magnetic sensor 14a is larger than a predetermined threshold (step ST4).
  • the current I to be measured is measured using the second magnetic sensor 14b (step ST3).
  • the output signal of the first magnetic sensor 14a becomes smaller than a predetermined threshold value
  • the magnitude of the current I to be measured is measured using both the first and second magnetic sensors 14a and 14b (step ST1). .
  • the current to be measured is measured by repeating the above operation.
  • the current sensor 1 is manufactured in which the first and second magnetic sensors 14 a and 14 b are arranged at different distances from the center point P ⁇ b> 2 of the conductive member 12 through the substrate 13. While switching the first and second magnetic sensors 14a and 14b, the output signal of the current sensor 1 when the measured current I was changed from 0A to 1000A was examined. The result is shown in FIG.
  • a current sensor is manufactured by arranging a pair of magnetic sensors 14a and 14b on the conductive member 12 through the substrate 13 at equal distances from the center point P2 of the conductive member 12, respectively.
  • the output signal of the current sensor when the measured current I was changed from 0A to 1000A was examined.
  • the results are also shown in FIG.
  • the output signal of the current sensor changes linearly from the small current I to be measured to the large current I to be measured.
  • the current sensor according to the comparative example it can be seen that magnetic saturation occurs and the output signal of the current sensor becomes constant in the range of the measured current I greater than 600A.
  • the distance between the first magnetic sensor 14a and the central point P2 of the conductive member 12 is such that the second magnetic sensor 14b and the conductive member 12 It arrange
  • the induced magnetic field M1 from the current I to be measured is applied to the first and second magnetic sensors 14a and 14b as magnetic vectors M2 having different magnitudes.
  • the output signal output from the second magnetic sensor 14a is relatively larger than the output signal output from the second magnetic sensor 14b.
  • the measured current I is a large current
  • only the magnetic vector M2 of the induction magnetic field M1 is applied to the second magnetic sensor 14a, so that it is possible to suppress the magnetic saturation of the second magnetic sensor 14b. It becomes. Therefore, the measurement range of the current I to be measured can be expanded.
  • the sensitivity axis direction D1 of the first and second magnetic sensors 14a and 14b is fixed in the same direction, and the first and second magnetic sensors are fixed. Since the output signals of the sensors 14a and 14b are differentially calculated, noise due to the disturbance magnetism Hc applied to the first and second magnetic sensors 14a and 14b can be canceled out.
  • a pair of first and second magnetic sensors 14a and 14b are arranged on the conductive member 12 via the substrate 13, and the in-plane direction of the substrate 13 and the conductive member are arranged. Since the 12 major axis directions D3 coincide with each other, the current sensor 1 can be downsized. Further, since the first and second magnetic sensors 14a and 14b are disposed on the single substrate 13, the current sensor 1 can be easily manufactured, and the manufacturing cost can be reduced.
  • the present invention is not limited to the above embodiment, and can be implemented with various modifications.
  • the connection relationship, size, and the like of each element in the above embodiment can be changed as appropriate.
  • the present invention can be implemented with appropriate modifications without departing from the scope in which the effects of the present invention can be obtained.
  • the distance between the first magnetic sensor 14a and the central point P2 of the conductive member 12 is such that the second magnetic sensor 14b and the central point P2 of the conductive member 12 are
  • 14b can be changed in a timely manner as long as the disturbance magnetic Hc is applied to the first and second magnetic sensors 14b at the same intensity.
  • the first and second magnetic sensors 14a and 14b have an angle ⁇ 1 formed by the direction in which the induction magnetic field M1 is applied to the first magnetic sensor 14a and the sensitivity axis direction D1 of the first magnetic sensor 14a.
  • the magnetic sensor 14b may be arranged so as to be smaller than an angle ⁇ 2 formed by the direction in which the induced magnetic field M1 is applied to the magnetic sensor 14b and the sensitivity axis direction D1 of the second magnetic sensor 14b. Even with this configuration, when the current I to be measured is small, the current I to be measured can be measured by the first magnetic sensor 14a having relatively high detection sensitivity. Further, when the measured current I is a large current, only the magnetic vector M2 of the induction magnetic field M1 is applied to the second magnetic sensor 14a, so that it is possible to suppress the magnetic saturation of the second magnetic sensor 14b. It becomes.
  • the shape of the conductive member 12 includes the short axis direction D2 and the long axis direction D3. If it has a shape, it can be changed at any time.
  • the shape of the conductive member 12 can be changed in a timely manner as long as the effect of the present invention is obtained, for example, a rectangular shape, an elliptical shape, a flat shape, or the like in a sectional view.
  • the angle ⁇ 2 of the induced magnetic field M1 applied to the second magnetic sensor 14b is within a range in which the magnetic saturation of the second magnetic sensor 14b can be suppressed. It can be changed in a timely manner.
  • the output signal of the first magnetic sensor 14a is compared with a predetermined threshold value and the first and second magnetic sensors 14a and 14b are switched has been described.
  • the output signal of the sensor 14b and a predetermined threshold value may be compared to switch the first and second magnetic sensors 14a and 14b.
  • the substrate 13 is not limited to the above arrangement configuration, and can be changed in a timely manner.
  • the substrate 13 may be disposed at a predetermined angle with respect to the major axis direction of the conductive member 12.
  • the first magnetic sensor and the second magnetic sensor are configured to use magnetic balance sensors, but the present invention is not limited to this configuration.
  • the magnetic sensor may be any sensor that outputs output signals to each other by an induced magnetic field from the current I to be measured passing through the current line.
  • a magnetic proportional sensor, a Hall element, or other magnetic detection element may be used. Good. By using a magnetic proportional sensor, it is possible to reduce power consumption as compared with a configuration using a magnetic balance sensor.
  • the present invention has an effect that it can measure a wide range of currents to be measured and can reduce noise due to disturbance magnetism, and is particularly suitable for a current sensor that detects the magnitude of a current for driving a motor of an electric vehicle or a hybrid car. It is possible to use.

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

Abstract

L'invention concerne un détecteur de courant qui peut mesurer un courant à mesurer dans une large plage et qui peut réduire le bruit lié aux perturbations magnétiques externes. Ce détecteur de courant (1) comprend : un premier et un deuxième capteur magnétique (14a, 14b) qui délivrent des signaux de sortie par induction d'un champ à partir d'un courant à mesurer ; une unité de commande (21) qui réalise un calcul différentiel sur les signaux de sortie du premier et du deuxième capteur magnétique (14a, 14b) ; et un circuit de commande de commutation (221) qui réalise la commutation entre une connexion avec laquelle le premier capteur magnétique (14a) est connecté à une unité de traitement (21) et une connexion avec laquelle le deuxième capteur magnétique (14b) est connecté à l'unité de traitement. Le premier et le deuxième capteur magnétique (14a, 14b) présentent une direction (D1) fixe identique de leurs axes de sensibilité et sont disposés à des distances différentes du point central (P2) d'un élément conducteur (12). Le circuit de commande de commutation (221) détermine si les signaux de sortie du premier et du deuxième capteur magnétique (14a, 14b) sont supérieurs à des valeurs de seuil prédéterminées et, suivant les résultats de la détermination, le circuit de commande de commutation réalise la commutation entre la connexion avec laquelle le premier capteur magnétique (14a) est connecté à l'unité de traitement (21) et la connexion avec laquelle le deuxième capteur magnétique (14b) est connecté à l'unité de commande.
PCT/JP2011/066811 2010-08-31 2011-07-25 Détecteur de courant WO2012029439A1 (fr)

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Cited By (3)

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EP3667334A1 (fr) * 2018-12-12 2020-06-17 Melexis Technologies SA Capteur de courant
CN111308153A (zh) * 2018-12-12 2020-06-19 迈来芯电子科技有限公司 具有集成电流导体的电流传感器
EP3919922A1 (fr) * 2020-06-02 2021-12-08 Melexis Technologies SA Système de capteur de courant

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DE102017214142A1 (de) * 2017-08-14 2019-02-14 Robert Bosch Gmbh Messanordnung und Verfahren zum magnetischen Sensieren eines elektrischen Stroms sowie ein Fahrzeug mit einer solchen Messanordnung

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JP2020095029A (ja) * 2018-12-12 2020-06-18 メレキシス テクノロジーズ エス エーＭｅｌｅｘｉｓ Ｔｅｃｈｎｏｌｏｇｉｅｓ ＳＡ 電流センサ
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US11422163B2 (en) 2018-12-12 2022-08-23 Melexis Technologies Sa Current sensor
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