WO2016002500A1 - Capteur de courant - Google Patents

Capteur de courant Download PDF

Info

Publication number
WO2016002500A1
WO2016002500A1 PCT/JP2015/067265 JP2015067265W WO2016002500A1 WO 2016002500 A1 WO2016002500 A1 WO 2016002500A1 JP 2015067265 W JP2015067265 W JP 2015067265W WO 2016002500 A1 WO2016002500 A1 WO 2016002500A1
Authority
WO
WIPO (PCT)
Prior art keywords
magnetic
current sensor
magnetic sensors
current
wiring
Prior art date
Application number
PCT/JP2015/067265
Other languages
English (en)
Japanese (ja)
Inventor
川浪　崇
清水　康弘
Original Assignee
株式会社村田製作所
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 株式会社村田製作所 filed Critical 株式会社村田製作所
Priority to JP2016531245A priority Critical patent/JPWO2016002500A1/ja
Publication of WO2016002500A1 publication Critical patent/WO2016002500A1/fr

Links

Images

Classifications

    • 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

Definitions

  • the present invention relates to a current sensor, and particularly to a current sensor including a plurality of magnetic sensors.
  • a current sensor including a magnetic sensor is known.
  • a current sensor provided with a magnetic sensor is provided with a magnetic sensor around a primary conductor (bus bar) through which a primary current to be measured flows, and a magnetic field generated by the primary current is detected by the magnetic sensor. The value of is detected. Therefore, a current sensor including a magnetic sensor is required to reduce the influence of a magnetic field different from the magnetic field generated by the primary current, that is, an unnecessary external magnetic field.
  • a first magnetic sensor, a second magnetic sensor, a first magnetic sensor, and a second magnetic sensor are connected via a first wiring and a second wiring, respectively.
  • a current sensor is disclosed that includes an arithmetic circuit connected to the magnetic sensor.
  • Each of the first magnetic sensor and the second magnetic sensor includes a bridge circuit including four magnetoresistive elements and a circuit that outputs a single-ended signal obtained by differentially amplifying the output of the bridge circuit to an arithmetic circuit.
  • the arithmetic circuit outputs a signal obtained by differentially amplifying the single-ended signal differentially amplified in the first magnetic sensor and the single-ended signal differentially amplified in the second magnetic sensor, to the final current sensor.
  • Patent Document 2 discloses a current sensor including two magnetic sensors, two feedback coils respectively connected to the two magnetic sensors, and an arithmetic unit connected to the two feedback coils. It is disclosed.
  • Each of the two magnetic sensors includes a bridge circuit including two magnetoresistive elements and two fixed resistance elements, and a circuit that outputs a signal obtained by differentially amplifying the output of the bridge circuit to the arithmetic unit via a feedback coil. .
  • JP 2012-98202 A Japanese Patent No. 5411285
  • the single-ended signal differentially amplified in the first magnetic sensor and the single-ended signal differentially amplified in the second magnetic sensor are each the first When the signal is transmitted to the differential amplifier circuit via the wiring and the second wiring, noise due to an unnecessary external magnetic field may be superimposed on at least one of the first wiring and the second wiring.
  • the wiring capacity of the first wiring and the second wiring are made equal, the lengths of the first wiring and the second wiring are made equal, or the first wiring and the second wiring are It may be possible to easily remove the superimposed noise by a method such as making the shape the same.
  • the degree of freedom in designing the first wiring and the second wiring is lowered, and there is a possibility that the degree of freedom in arrangement of the first magnetic sensor and the second magnetic sensor is lowered.
  • connection between the two feedback coils and the calculation unit is an unbalanced type in which one terminal is grounded.
  • the unbalanced connection has a problem that it is susceptible to noise due to an induced electromotive force due to an unnecessary external magnetic field.
  • the present invention has been made in view of the above-described problems, and an object of the present invention is to provide an unnecessary external magnetic field in a current sensor having a plurality of magnetic sensors without impairing the degree of freedom of arrangement of the plurality of magnetic sensors. It is to reduce the influence by.
  • the current sensor detects the current flowing through the conductor.
  • the current sensor includes a plurality of magnetic sensors each disposed at a position where it can be magnetically coupled to the conductor, a calculation unit that calculates the magnitude of the current flowing through the conductor based on outputs of the plurality of magnetic sensors, and a calculation unit And a plurality of wiring portions respectively connecting the plurality of magnetic sensors.
  • Each of the plurality of magnetic sensors has a balanced output unit that balances and outputs two voltage signals corresponding to the magnetic flux.
  • Each of the plurality of wiring units includes two signal lines for outputting two voltage signals balanced-output by the balanced output unit to the arithmetic unit.
  • the two signal lines included in each of the plurality of wiring portions are arranged substantially parallel to each other at positions close to each other.
  • the two signal lines included in each of the plurality of wiring portions are arranged such that a surface formed by the two signal lines is substantially parallel to a specific direction.
  • the two signal lines included in each of the plurality of wiring portions are arranged in a single plane whose normal is the direction of the current flowing through the conductor.
  • the two signal lines included in each of the plurality of wiring portions are more aligned with each other.
  • each of the plurality of magnetic sensors further includes a bridge circuit that outputs two voltage signals corresponding to the magnetic flux.
  • the balanced output unit balance-amplifies and outputs the two voltage signals input from the bridge circuit.
  • the plurality of magnetic sensors includes two magnetic sensors.
  • the arithmetic unit differentially amplifies two voltage signals output from the other of the two magnetic sensors and a first differential amplifier that differentially amplifies the two voltage signals output from the one of the two magnetic sensors.
  • an amplification unit is an amplification unit.
  • the plurality of wiring portions are electrostatically shielded from the outside.
  • the plurality of magnetic sensors and the calculation unit are respectively formed on a plurality of different substrates.
  • the calculation unit is magnetically shielded from the outside.
  • the influence of an unnecessary external magnetic field can be reduced without impairing the degree of freedom of arrangement of the plurality of magnetic sensors.
  • FIG. 1 shows the whole structure of a current sensor. It is a circuit diagram (the 1) of a current sensor. It is a figure which shows typically the magnetic flux which generate
  • FIG. 3 is a second diagram illustrating the entire configuration of the current sensor. It is a circuit diagram (the 2) of a current sensor. It is FIG. (3) which shows the whole structure of a current sensor.
  • FIG. 4 is a diagram (part 4) illustrating an entire configuration of a current sensor; It is a circuit diagram (the 3) of a current sensor.
  • balanced output means outputting two input signals, respectively.
  • “Balanced amplification (balanced amplification)” is an aspect of balanced output, and means that two signals obtained by amplifying two input signals are output.
  • “Differential amplification” means outputting one signal obtained by subtracting the other from one of the two input signals, or a signal obtained by amplifying one signal obtained by subtraction. It shall be.
  • FIG. 1 is a diagram showing an overall configuration of a current sensor 1 according to the present embodiment.
  • FIG. 1A is a plan view of the current sensor 1.
  • FIG. 1B is a cross-sectional view of the current sensor 1 taken along the line II of FIG.
  • FIG. 1C is a cross-sectional view of the current sensor 1 taken along the line II-II in FIG.
  • the current sensor 1 includes a primary conductor (bus bar) 10, two magnetic sensors 20A and 20B, a calculation unit 30, and two wiring units 40A and 40B.
  • the primary current i to be measured flows through the primary conductor 10.
  • the primary conductor 10 is a quadrangular columnar metal plate.
  • metals such as copper, silver, and aluminum can be used.
  • the primary conductor 10 can be manufactured by a method such as pressing, cutting, casting, or forging.
  • the surface of the primary conductor 10 may be subjected to a surface treatment such as plating with nickel, tin, copper, silver, or the like.
  • the configuration of the current sensor 1 will be described using the system.
  • the two magnetic sensors 20A and 20B are arranged side by side in the Z direction so as to face each other with the primary conductor 10 interposed therebetween.
  • the two magnetic sensors 20 ⁇ / b> A and 20 ⁇ / b> B are arranged with a certain distance from the primary conductor 10.
  • each printed circuit board is made of an insulating material.
  • the printed circuit board is soldered to the primary conductor 10, and the magnetic sensor 20A or the magnetic sensor 20B is solder-mounted on the other surface of each printed circuit board.
  • glass epoxy or ceramics such as bakelite, paper epoxy, and alumina can be used.
  • the two magnetic sensors 20A and 20B have sensitivity axes Da and Db, respectively.
  • the sensitivity axis Da of the magnetic sensor 20A is set in the positive direction of the X direction.
  • the sensitivity axis Db of the magnetic sensor 20B is also set in the positive direction of the X direction.
  • Each magnetic sensor 20A, 20B outputs a positive value when a magnetic flux directed in one direction of each sensitivity axis Da, Db is applied, and is directed in a direction opposite to one direction of each sensitivity axis Da, Db.
  • a characteristic that outputs a negative value when the applied magnetic flux is applied hereinafter also referred to as “odd function input / output characteristic”.
  • the magnetic sensors 20A and 20B are arranged in such a manner that the output of the magnetic sensor 20A and the output of the magnetic sensor 20B when the right-handed magnetic field is generated by the primary current i are equal in magnitude (absolute value) and opposite in phase. As such, it is predetermined.
  • Each of the magnetic sensors 20A and 20B may be of a type (open loop type) that outputs an output signal via an amplifier or a converter that calculates the output signal linearly or in a correction function, or is excited via an amplifier or a converter.
  • the calculation unit 30 is connected to the two magnetic sensors 20A and 20B by the two wiring units 40A and 40B, respectively.
  • the arithmetic unit 30 calculates the value of the primary current i by subtracting (differential amplification) the output signal of the magnetic sensor 20A and the output signal of the magnetic sensor 20B.
  • the magnetic sensors 20A and 20B and the arithmetic unit 30 are respectively formed on three different substrates. Specifically, the magnetic sensors 20A and 20B and the calculation unit 30 are each independently formed into a substrate shape, a module shape, a monolithic integrated circuit shape, and a hybrid integrated circuit shape. Although not shown, the magnetic sensors 20A and 20B and the arithmetic unit 30 are molded with an insulating resin in one casing and their mutual positional relationship is fixed.
  • the type of resin for molding may be thermosetting or thermoplastic.
  • PPS polyphenylene sulfide
  • PCT polycyclohexylene dimethylene terephthalate
  • LCP liquid crystal polymer
  • nylon epoxy resin, and the like, which are excellent in heat resistance and mold accuracy, are suitable.
  • the two wiring parts 40A and 40B are both balanced signal lines. That is, the wiring unit 40A includes two signal lines 41A and 42A for balanced output (balanced output) of the two voltage signals input from the magnetic sensor 20A to the arithmetic unit 30. Similarly, the wiring unit 40B includes two signal lines 41B and 42B for balanced output (balance output) of the two voltage signals input from the magnetic sensor 20B to the arithmetic unit 30.
  • the two signal lines 41A and 42A included in the wiring section 40A are arranged in parallel in a position close to each other.
  • the two signal lines 41A and 42A are arranged so as to overlap when viewed from the Z direction (see FIG. 1A). That is, the surface formed by the two signal lines 41A and 42A is arranged in a single plane that is substantially parallel to the XZ plane (a plane having the direction of the primary current i as a normal line).
  • the two signal lines 41B and 42B included in the wiring part 40B are arranged in parallel in a position close to each other.
  • the two signal lines 41B and 42B are arranged so as to overlap when viewed from the Z direction (see FIG. 1A). That is, the two signal lines 41B and 42B are arranged in a single plane substantially parallel to the XZ plane (a plane having the direction of the primary current i as a normal line).
  • the signal lines 41A, 42A, 41B, and 42B included in the wiring portions 40A and 40B are arranged so as to overlap each other when viewed from the Z direction (see FIG. 1A). That is, the signal lines 41A, 42A, 41B, and 42B are all arranged in a single XZ plane having the direction of the primary current i as a normal line.
  • the XZ plane is a plane substantially parallel to the direction of the magnetic flux ⁇ generated by the primary current i (see FIG. 3 described later).
  • FIG. 2 is a circuit diagram of the current sensor 1.
  • the magnetic sensor 20A includes a bridge circuit 21A and a balanced amplifier circuit 22A.
  • the bridge circuit 21A is a Wheatstone bridge type full bridge circuit including the magnetoresistive elements R1 to R4.
  • the magnetoresistive elements R1 to R4 are magnetoresistive elements such as AMR (Anisotropic Magneto Resistance), GMR (Giant Magneto Resistance), TMR (Tunnel Magneto Resistance), BMR (Ballistic Magneto Resistance), CMR (Colossal Magneto Resistance), etc.
  • AMR can be configured with an element having an odd function input / output characteristic by providing a barber pole structure.
  • the magnetoresistive elements R1 and R3 have one end connected to the power supply node N1 and the other end connected to output nodes N3 and N4, respectively.
  • One end of the magnetoresistive elements R2 and R4 is connected to the power supply node N2, and the other end is connected to the output nodes N3 and N4, respectively.
  • the power supply nodes N1 and N2 are respectively connected to a positive electrode and a negative electrode of a DC power supply (not shown).
  • Output nodes N3 and N4 are connected to a positive input portion and a negative input portion of balanced amplifier circuit 22A via signal lines L1 and L2, respectively.
  • the bridge circuit 21A When a magnetic flux is applied in the direction of the sensitivity axis Da (see FIG. 1), the bridge circuit 21A generates two voltage signals corresponding to the magnitude of the magnetic flux, and the balanced amplifier circuit via the signal lines L1 and L2, respectively. It outputs to the positive input part and negative input part of 22A.
  • the balanced amplifier circuit 22A performs balanced amplification (balance amplification) on the two voltage signals input from the bridge circuit 21A via the signal lines L1 and L2, and outputs the voltage signals to the signal lines 41A and 42A of the wiring section 40A, respectively.
  • the magnetic sensor 20B includes a bridge circuit 21B and a balanced amplifier circuit 22B.
  • the configurations of the bridge circuit 21B and the balanced amplifier circuit 22B are basically the same as the configurations of the bridge circuit 21A and the balanced amplifier circuit 22A. That is, when a magnetic flux is applied in the direction of the sensitivity axis Db (see FIG. 1), the bridge circuit 21B generates two voltage signals corresponding to the magnitude of the magnetic flux, and is balanced via the signal lines L1 and L2, respectively. It outputs to the positive input part and negative input part of amplifier circuit 22B.
  • the balanced amplifier circuit 22B performs balanced amplification (balance amplification) on the two voltage signals input from the bridge circuit 21B and outputs them to the signal lines 41B and 42B of the wiring section 40B, respectively.
  • the calculation unit 30 includes three differential amplifier circuits 31A, 31B, and 32.
  • the arithmetic unit 30 first differentially amplifies the output signals of the magnetic sensors 20A and 20B by the differential amplifier circuits 31A and 31B to form single-end signals, and then outputs the single-end signals output from the differential amplifier circuit 31A. And the single-ended signal output from the differential amplifier circuit 31B is subtracted (differential amplification) by the differential amplifier circuit 32.
  • a signal differentially amplified by the differential amplifier circuit 32 is output as a final output signal (a signal indicating the value of the primary current i) of the current sensor 1.
  • FIG. 3 is a diagram schematically showing the magnetic flux ⁇ generated around the current sensor 1 by the primary current i. With reference to FIG. 3, the effect of the current sensor 1 by this Embodiment is demonstrated.
  • the primary current i flows through the primary conductor 10, so that the primary conductor 10 is centered on the primary current i in FIG.
  • a magnetic field (magnetic flux ⁇ ) that circulates clockwise is generated.
  • a magnetic flux ⁇ directed in one direction of the sensitivity axis Da (positive direction in the X direction) is applied to the magnetic sensor 20A
  • a direction opposite to one direction of the sensitivity axis Da (in the X direction) is applied to the magnetic sensor 20B.
  • a magnetic flux ⁇ directed in the negative direction) is applied.
  • the output of the magnetic sensor 20A and the output of the magnetic sensor 20B are equal in magnitude (absolute value) and opposite in phase.
  • the magnetic sensors 20A and 20B and the calculation unit 30 are connected by balanced wiring units 40A and 40B, respectively. Therefore, compared to the case where the magnetic sensors 20A and 20B and the arithmetic unit 30 are connected by an unbalanced signal line, the current sensor 1 that is resistant to noise can be realized.
  • the two voltage signals from the magnetic sensor 20A are respectively input to the differential amplifier circuit 31A of the arithmetic unit 30 via the balanced wiring section 40A, and the differential amplifier circuit 31A performs a difference. Dynamically amplified.
  • two voltage signals from the magnetic sensor 20B are respectively input to the differential amplifier circuit 31B of the arithmetic unit 30 via the balanced wiring section 40B, and are differentially amplified by the differential amplifier circuit 31B.
  • the common-mode noise is canceled out by being differentially amplified by the differential amplifier circuits 31A and 31B of the arithmetic unit 30, respectively. That is, the noise can be removed by the differential amplifier circuits 31A and 31B before the output signal of the magnetic sensor 20A and the output signal of the magnetic sensor 20B are subtracted (differential amplification) by the differential amplifier circuit 32.
  • the design restrictions of the wiring portions 40A and 40B for example, the restriction that the length of the wiring portion 40A and the length of the wiring portion 40B are substantially the same, the shape of the wiring portion 40A and the shape of the wiring portion 40B are substantially the same.
  • the common-mode noise superimposed on the wiring portions 40A and 40B can be removed without being restricted by the above. Therefore, the degree of freedom of arrangement of the magnetic sensors 20A and 20B and the calculation unit 30 is increased, and the design is advantageous in that the S / N ratio (Signal-to-Noise ratio) on the magnetic circuit and measurement is advantageous. It becomes possible to set it as the shape and arrangement
  • the wiring portion 40A is the signal lines 41A and 42A arranged substantially in parallel, the magnetic sensor 20A, the signal lines 41A and 42A, and the arithmetic unit 30 form a closed loop. Since the induced electromotive force generated with the time change of the magnetic flux density passing through the closed loop is superimposed as noise, it can be a factor of reducing the measurement accuracy of the current sensor 1.
  • the two signal lines 41A and 42A included in the wiring section 40A are arranged at positions close to each other. Thereby, the area of the closed loop formed between the signal lines 41A and 42A can be reduced. Therefore, the magnetic flux passing through the closed loop formed between the signal lines 41A and 42A can be reduced, and the magnetic noise received by the wiring portion 40A can be suppressed.
  • the two signal lines 41B and 42B included in the wiring part 40B are arranged at positions close to each other. Therefore, the magnetic flux passing through the closed loop formed between the signal lines 41B and 42B can be reduced, and the magnetic noise received by the wiring part 40B can be suppressed.
  • the two signal lines 41A and 42A included in the wiring portion 40A are arranged in a single plane substantially parallel to the XZ plane having the direction of the primary current i as a normal line. . Therefore, the surface formed by the signal lines 41A and 42A (the closed loop formed between the signal lines 41A and 42A) is arranged so as to be substantially parallel to the direction of the magnetic flux ⁇ generated by the primary current i. As a result, even if a magnetic flux ⁇ due to the right-handed magnetic field is generated around the primary conductor 10 by the primary current i, the magnetic flux ⁇ does not cross the closed loop formed between the signal lines 41A and 42A. be able to. Therefore, the magnetic noise received by the wiring part 40A can be minimized.
  • the two signal lines 41B and 42B included in the wiring portion 40B are also arranged in a single plane substantially parallel to the XZ plane.
  • the magnetic flux ⁇ does not cross the closed loop formed between the signal lines 41B and 42B. be able to. Therefore, the magnetic noise received by the wiring part 40B can be minimized.
  • all of the signal lines 41A, 42A, 41B, and 42B included in the wiring portions 40A and 40B are a single plane that is substantially parallel to the XZ plane having the direction of the primary current i as a normal line. Placed inside. Therefore, the difference between the magnetic noise received by the wiring unit 40B and the magnetic noise received by the wiring unit 40B can be further reduced.
  • the magnetic sensors 20A and 20B preliminarily balance and amplify the output signals of the bridge circuits 21A and 21B in the magnetic sensors 20A and 20B, and then output them to the wiring sections 40A and 40B. For this reason, it is possible to increase the signal passing through the wiring sections 40A and 40B as compared with the case where the output signals of the bridge circuits 21A and 21B are simply output in a balanced manner (when the balanced amplification is not performed in the magnetic sensors 20A and 20B). As a result, it is possible to relatively reduce the influence of noise received in the portions after the wiring portions 40A and 40B. Therefore, the current sensor 1 that is more resistant to noise can be realized.
  • the arithmetic unit 30 is differentially amplified by the single-ended signal (the output signal of the magnetic sensor 20A) after being differentially amplified by the differential amplifier circuit 31A and the differential amplifier circuit 31B.
  • the single-ended signal (output signal of the magnetic sensor 20B) after the subtraction is subtracted (differential amplification) by the differential amplifier circuit 32 to calculate the value of the primary current i. Therefore, noise that has not been removed by the differential amplifier circuits 31A and 31B is also removed at the time of subtraction by the differential amplifier circuit 32. As a result, it is possible to realize the current sensor 1 that is extremely resistant to disturbance noise.
  • the magnetic sensors 20A and 20B and the arithmetic unit 30 are respectively formed on three different substrates. Therefore, it is possible to realize the current sensor 1 having a higher degree of freedom in arrangement of the magnetic sensors 20A and 20B and the calculation unit 30 and having high disturbance resistance.
  • the magnetic sensors 20A and 20B and the calculation unit 30 are connected by the balanced wiring units 40A and 40B, respectively. Therefore, it is possible to reduce the influence of an unnecessary external magnetic field without impairing the degree of freedom of arrangement of the magnetic sensors 20A and 20B.
  • this Embodiment can be deform
  • ⁇ Modification 1> In the above-described embodiment, the case where one current sensor 1 is provided has been described. However, the present invention is also effective when a plurality of current sensors 1 are arranged adjacent to each other.
  • FIG. 4 is a diagram illustrating an example in which the current sensor according to the above-described embodiment is applied to three-phase alternating current.
  • the three current sensors 1u, 1v, and 1w shown in FIG. 4 are respectively provided with three primary conductors 10u, 10v, and 10w through which three-phase alternating currents (U-phase current iu, V-phase current iv, and W-phase current iw) flow.
  • the three primary conductors 10u, 10v, 10w are arranged in parallel in the X direction with a predetermined interval.
  • the balanced wiring portions 40A and 40B included in each of the current sensors 1u, 1v, and 1w are all arranged in a single XZ plane with the direction of each of the phase currents iu, iv, and iw as normals.
  • the basic structure of the current sensors 1u, 1v, 1w is the same as that of the current sensor 1 according to the above-described embodiment.
  • the three current sensors 1u, 1v, and 1w may be arranged in parallel as shown in FIG.
  • a magnetic flux ⁇ u due to the right-handed magnetic field due to the U-phase current iu a magnetic flux ⁇ v due to the right-handed magnetic field due to the V-phase current iv
  • a magnetic flux ⁇ w due to the right-handed magnetic field due to the W-phase current iw are generated.
  • the magnetic field due to the current flowing through the adjacent primary conductor circulates around each primary conductor. For example, as shown in FIG.
  • the magnetic field generated by the U-phase current iu flowing through the primary conductor 10u and the primary conductor are disposed around the primary conductor 10v.
  • a magnetic field generated by the W-phase current iw flowing through 10w circulates.
  • the signal lines included in the wiring portions 40A and 40B of the current sensors 1u, 1v, and 1w are all arranged in a single XZ plane whose normal is the direction of the phase currents iu, iv, and iw. The Therefore, it is possible to prevent the magnetic fluxes ⁇ u, ⁇ v, ⁇ w caused by the phase currents iu, iv, iw from crossing the closed loop formed between the balanced signal lines in the wiring portions 40A, 40B. Therefore, the magnetic noise received by each wiring part 40A, 40B can be minimized.
  • the magnetic sensors 20A and 20B and the calculation unit 30 are formed independently.
  • the magnetic sensors 20A and 20B and the arithmetic unit 30 are not necessarily formed independently.
  • all or part of the magnetic sensors 20A and 20B and the arithmetic unit 30 may be integrally formed in a substrate shape, a module shape, a monolithic integrated circuit shape, or a hybrid integrated circuit shape.
  • FIG. 5 is a diagram showing an overall configuration of the current sensor 1-1 in which the magnetic sensor 20B and the calculation unit 30 are integrated into a module.
  • FIG. 5A is a plan view of the current sensor 1-1.
  • FIG. 5B is a cross-sectional view of the current sensor 1-1 taken along line II of FIG.
  • FIG. 5C is a cross-sectional view of the current sensor 1-1 taken along line II-II in FIG.
  • the magnetic sensor 20B and the arithmetic unit 30 are integrally configured as one module 30-1, and the module 30-1 and the magnetic sensor 20A are balanced. Connected by 40A-1.
  • FIG. 6 is a circuit diagram of the current sensor 1-1 shown in FIG. As shown in FIG. 6, the magnetic sensor 20B and the calculation unit 30 are arranged in one module 30-1. Therefore, the magnetic sensor 20B and the arithmetic unit 30 are connected to each other through the balanced wiring unit 40B-1 in the module 30-1.
  • the magnetic sensor 20B and the arithmetic unit 30 are integrally configured for design reasons, the lengths and shapes of the wiring units 40A-1 and 40B-1 are different. However, since the wiring portions 40A-1 and 40B-1 are balanced signal lines, the influence of noise can be suppressed.
  • the wiring portions 40A and 40B are parallel lines.
  • the wiring sections 40A and 40B may be two lines that repeat the intersection more closely, so-called twisted pair lines.
  • FIG. 7 is a diagram showing an overall configuration of the current sensor 1-2 including the wiring portions 40A-2 and 40B-2, each of which is a twisted pair wire.
  • FIG. 7A is a plan view of the current sensor 1-2.
  • FIG. 7B is a cross-sectional view of the current sensor 1-2 taken along line II of FIG. 7A.
  • FIG. 7C is a cross-sectional view of the current sensor 1-2 taken along the line II-II in FIG.
  • the wiring part 40A-2 is a twisted pair line
  • the wiring part 40B-2 is also a twisted pair line.
  • the twisted pair wire is realized by combining coated copper wires and the like.
  • the twisted pair lines may be realized using both front and back surfaces of a printed circuit board or the like, or may be realized by using through holes.
  • the generated electromotive forces cancel each other regardless of the direction of the magnetic flux applied from the outside. Therefore, the magnetic noise received by the magnetic flux applied from an unspecified direction can be suppressed to the minimum.
  • the wiring portions 40A and 40B are not electrostatically shielded. However, they may be electrostatically shielded from the outside.
  • FIG. 8 is a diagram showing an overall configuration of a current sensor 1-3 including wiring portions 40A-3 and 40B-3 covered with electrostatic shield members 43A and 43B, respectively.
  • FIG. 8A is a plan view of the current sensor 1-3.
  • FIG. 8B is a cross-sectional view of the current sensor 1-3 taken along line II in FIG. 8A.
  • FIG. 8C is a cross-sectional view of the current sensor 1-3 taken along the line II-II in FIG.
  • FIG. 9 is a circuit diagram of the current sensor 1-3 shown in FIG.
  • the wiring portions 40A-3 and 40B-3 are the same as the electrostatic shielding members 43A and 40B-2 (twisted pair wires) shown in the third modification example, respectively. It is covered with 43B. Therefore, the wiring portions 40A-3 and 40B-3 are electrostatically shielded against the external potential.
  • the electrostatic shield members 43A and 43B a copper plate, a copper foil, a copper net, an aluminum plate, an aluminum foil, an aluminum net, or the like can be used.
  • the electrostatic shield members 43A and 43B are grounded. Therefore, the potentials of the electrostatic shield members 43A and 43B are fixed at the ground level. That is, the ground potentials of the magnetic sensors 20A and 20B, the electrostatic shield members 43A and 43B, and the calculation unit 30 are constant.
  • the balanced signal line included in each of the wiring sections 40A-3 and 40B-3 is the twisted pair line shown in the above-described third modification. Therefore, in addition to the electrostatic noise received by the wiring portions 40A-3 and 40B-3, the magnetic field noise received by the wiring portions 40A-3 and 40B-3 can be minimized. As a result, the disturbance noise removal capability can be further enhanced.
  • the arithmetic unit 30 is not magnetically shielded, but the arithmetic unit 30 may be magnetically shielded. As a result, a current sensor that is less susceptible to malfunctions due to electromagnetic interference can be realized.
  • the magnetic sensors 20A and 20B since it is necessary to magnetically couple the magnetic sensors 20A and 20B with the magnetic flux by the primary current i to be measured, it is not desirable that the magnetic sensors 20A and 20B be affected by the magnetic shield. Therefore, when a magnetic shield is applied to the arithmetic unit 30, as described in the above embodiment, the arithmetic unit 30 and the magnetic sensors 20A and 20B are arranged apart from each other, and these are connected by a balanced signal line. By doing so, it is possible to perform measurement while minimizing the influence of magnetic noise and electrostatic noise.
  • the primary conductor 10 is a part of the configuration of the current sensor 1, but the primary conductor 10 is not necessarily limited to being a part of the configuration of the current sensor 1. That is, the primary conductor 10 may not be included in the configuration of the current sensor 1 and may be used by the user of the current sensor 1 in combination with the current sensor 1 as appropriate.
  • the bridge circuits 21A and 21B included in the magnetic sensors 20A and 20B are Wheatstone bridge type full bridge circuits, but the bridge circuits 21A and 21B are half Wheatstone bridge type bridge circuits. It is good.
  • a magnetic sensor using a Hall element an MI (Magneto Impedance) magnetic sensor, a fluxgate magnetic sensor, or the like may be used.
  • the bias applied to the magnetic sensors 20A and 20B is not limited to the above-described method using the barber pole structure, and the bias is generated using an induction magnetic field generated around the coil, a magnetic field of a permanent magnet, or a magnetic field combining these. You may spend.
  • the three differential amplifier circuits 31A, 31B, and 32 are used as the arithmetic unit 30, but the configuration of the arithmetic unit 30 is not limited to this.
  • a single balanced input type differential amplifier circuit may be used as the arithmetic unit 30.
  • two balanced input type analog-digital converters may be used to subtract these outputs.
  • all of the signal lines 41A, 42A, 41B, and 42B included in the wiring portions 40A and 40B are arranged in a single plane.
  • the plane on which the signal lines 41A and 42A are arranged may be different from the plane on which the signal lines 41A and 42A are arranged.
  • the number of magnetic sensors included in the current sensor is two in the above-described embodiment, the number of magnetic sensors included in the current sensor may be three or more.

Landscapes

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

Abstract

L'invention concerne un capteur de courant (1) qui comporte un conducteur principal (10) à travers lequel circule un courant à mesurer, deux capteurs magnétiques (20A, 20B) disposés à proximité dudit conducteur principal, une unité de calcul (30) qui calcule la valeur du courant en obtenant la différence entre des signaux de sortie provenant des deux capteurs magnétiques, et deux sections de câblage (40A, 40B) qui relient l'unité de calcul aux capteurs magnétiques respectifs. Chacune des sections de câblage (40A, 40B) est un câble de signal équilibré contenant deux fils de signal pour émettre, de manière équilibrée, deux signaux de tension entrés provenant du capteur magnétique correspondant.
PCT/JP2015/067265 2014-07-02 2015-06-16 Capteur de courant WO2016002500A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2016531245A JPWO2016002500A1 (ja) 2014-07-02 2015-06-16 電流センサ

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2014-136935 2014-07-02
JP2014136935 2014-07-02

Publications (1)

Publication Number Publication Date
WO2016002500A1 true WO2016002500A1 (fr) 2016-01-07

Family

ID=55019047

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2015/067265 WO2016002500A1 (fr) 2014-07-02 2015-06-16 Capteur de courant

Country Status (2)

Country Link
JP (1) JPWO2016002500A1 (fr)
WO (1) WO2016002500A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023276673A1 (fr) * 2021-07-02 2023-01-05 株式会社村田製作所 Capteur de courant électrique

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH065685A (ja) * 1992-06-17 1994-01-14 Fuji Electric Co Ltd 半導体装置の製造方法
JP2012026966A (ja) * 2010-07-27 2012-02-09 Alps Green Devices Co Ltd 電流センサ
JP2012088191A (ja) * 2010-10-20 2012-05-10 Alps Green Devices Co Ltd 電流センサ
JP2012098202A (ja) * 2010-11-04 2012-05-24 Alps Green Devices Co Ltd 電流センサ
JP2014016347A (ja) * 2012-07-06 2014-01-30 Senis Ag 電流を測定するための電流変換器

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS463274Y1 (fr) * 1970-04-02 1971-02-04
JPH06105263B2 (ja) * 1987-02-27 1994-12-21 富士電機株式会社 電流検出装置
JPH08273952A (ja) * 1995-03-31 1996-10-18 Ikuro Moriwaki 平面電流検出器

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH065685A (ja) * 1992-06-17 1994-01-14 Fuji Electric Co Ltd 半導体装置の製造方法
JP2012026966A (ja) * 2010-07-27 2012-02-09 Alps Green Devices Co Ltd 電流センサ
JP2012088191A (ja) * 2010-10-20 2012-05-10 Alps Green Devices Co Ltd 電流センサ
JP2012098202A (ja) * 2010-11-04 2012-05-24 Alps Green Devices Co Ltd 電流センサ
JP2014016347A (ja) * 2012-07-06 2014-01-30 Senis Ag 電流を測定するための電流変換器

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023276673A1 (fr) * 2021-07-02 2023-01-05 株式会社村田製作所 Capteur de courant électrique

Also Published As

Publication number Publication date
JPWO2016002500A1 (ja) 2017-04-27

Similar Documents

Publication Publication Date Title
JP5531215B2 (ja) 電流センサ
JP5489145B1 (ja) 電流センサ
US10605835B2 (en) Current sensor
WO2017010219A1 (fr) Capteur de courant
US10274523B2 (en) Current sensor including a first current sensor and a second current sensor unit
JP2015049184A (ja) インバータ装置
WO2016194240A1 (fr) Capteur de courant électrique
JP2013170878A (ja) 電流センサ
JP6384677B2 (ja) 電流センサ
JP2021124289A (ja) 電流センサ、磁気センサ及び回路
JP6311790B2 (ja) 電流センサ
US10267825B2 (en) Current sensor including a housing surrounded by bent portions of primary conductors
WO2016203781A1 (fr) Capteur de courant
WO2012046547A1 (fr) Capteur de courant
WO2016002500A1 (fr) Capteur de courant
JP2013108787A (ja) 電流センサ
JP2015219058A (ja) 電流センサ
WO2023053792A1 (fr) Capteur de courant électrique, son procédé de correction, et procédé de correction d'une pluralité de capteurs de courant électrique
WO2012029439A1 (fr) Détecteur de courant
WO2016035606A1 (fr) Capteur de courant
JP5504483B2 (ja) 電流センサ
WO2014155888A1 (fr) Dispositif de capteur de magnétisme
JP5504488B2 (ja) 電流センサ
JP6671985B2 (ja) 電流センサ
JP2013142604A (ja) 電流センサ

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 15814269

Country of ref document: EP

Kind code of ref document: A1

ENP Entry into the national phase

Ref document number: 2016531245

Country of ref document: JP

Kind code of ref document: A

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 15814269

Country of ref document: EP

Kind code of ref document: A1