CN111624386A - Current sensor - Google Patents

Current sensor Download PDF

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Publication number
CN111624386A
CN111624386A CN202010478174.4A CN202010478174A CN111624386A CN 111624386 A CN111624386 A CN 111624386A CN 202010478174 A CN202010478174 A CN 202010478174A CN 111624386 A CN111624386 A CN 111624386A
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CN
China
Prior art keywords
current
sensor
leg
magnetic sensor
magnetic
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202010478174.4A
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Chinese (zh)
Inventor
李大来
蒋乐跃
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Aceinna Transducer Systems Co Ltd
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Aceinna Transducer Systems Co Ltd
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Publication date
Application filed by Aceinna Transducer Systems Co Ltd filed Critical Aceinna Transducer Systems Co Ltd
Priority to CN202010478174.4A priority Critical patent/CN111624386A/en
Publication of CN111624386A publication Critical patent/CN111624386A/en
Pending legal-status Critical Current

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
    • G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
    • G01R15/20—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices
    • G01R15/205—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices using magneto-resistance devices, e.g. field plates
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only

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

Abstract

The present invention provides a current sensor for detecting a current to be measured based on magnetic induction generated by the current to be measured, the current sensor including: a current-carrying conductor for providing a flow path for the current to be measured, the current-carrying conductor comprising a first leg, a second leg, and a connection between the first and second legs; a first magnetic sensor comprising a first magnetic sensor cell and a second magnetic sensor cell, the first and second magnetic sensor cells being located above and below the first leg, respectively, to form a differential output. Compared with the prior art, the invention can improve the detection precision of the current sensor in the environment of uneven external magnetic field.

Description

Current sensor
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of current sensors, in particular to a current sensor capable of improving external magnetic field suppression.
[ background of the invention ]
Current sensors for measuring the magnitude of current are widely used in various electronic devices. In the current sensor in the prior art, a U-shaped conductor is integrated inside the current sensor, two magneto-resistance sensor units are arranged around the conductor, so that a current to be measured flows through the U-shaped conductor integrated inside the current sensor, and the two magneto-resistance sensor units perform differential measurement on a magnetic field generated by the current in the conductor, thereby achieving the purpose of detecting (or detecting) the current to be measured.
However, in the conventional current sensor, the distance between the two magnetoresistive sensor units above or below the U-shaped conductor is relatively long, and the current sensor has a weak ability to suppress an external magnetic field in an inhomogeneous external magnetic field environment, thereby reducing the detection accuracy.
Therefore, it is necessary to provide a technical solution to overcome the above problems.
[ summary of the invention ]
One of the objectives of the present invention is to provide a current sensor, which can improve the detection accuracy of the current sensor in the environment of non-uniform external magnetic field.
According to one aspect of the present invention, there is provided a current sensor for detecting a current to be measured based on magnetic induction generated by the current to be measured, the current sensor including: a current-carrying conductor for providing a flow path for the current to be measured, the current-carrying conductor comprising a first leg, a second leg, and a connection between the first and second legs; a first magnetic sensor comprising a first magnetic sensor cell and a second magnetic sensor cell, the first and second magnetic sensor cells being located above and below the first leg, respectively, to form a differential output.
Further, the current sensor further includes a second magnetic sensor including a third magnetic sensor unit and a fourth magnetic sensor unit, the third and fourth magnetic sensor units being respectively located below and above the second leg to form a differential output.
Further, the first sensor unit and the second magnetic sensor unit are oppositely arranged; the third sensor unit and the fourth magnetic sensor unit are disposed opposite to each other.
Further, the first magnetic sensor and the second magnetic sensor are both magneto-resistance sensors.
Further, the current sensor may further include a signal processing circuit that averages the differential output of the first magnetic sensor and the differential output of the second magnetic sensor.
Further, the first leg portion and the second leg portion are located on the same side of the connecting portion; one end of the first leg portion serves as one end of the current-carrying conductor, and the other end of the first leg portion is connected with one end of the connecting portion; one end of the second leg portion serves as the other end of the current-carrying conductor, and the other end of the second leg portion is connected with the other end of the connecting portion.
Compared with the prior art, the current sensor comprises a current-carrying conductor and a magnetic sensor, wherein the magnetic sensor comprises a first magnetic sensor unit and a second magnetic sensor unit, and the first magnetic sensor unit and the second magnetic sensor unit are respectively positioned above and below the first leg or the second leg to form differential output. Therefore, the invention can improve the detection accuracy of the current sensor in the environment of uneven external magnetic field.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise. Wherein:
FIG. 1 is a schematic diagram of a current sensor in one embodiment of the present invention;
FIG. 2 is a schematic sectional view taken along line A-A of FIG. 1;
FIG. 3 is a schematic diagram of a current sensor according to another embodiment of the present invention;
fig. 4 is a schematic sectional view taken along line B-B of fig. 3.
[ detailed description ] embodiments
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic may be included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Unless otherwise specified, the terms connected, and connected as used herein mean electrically connected, directly or indirectly.
Fig. 1 shows a schematic structural diagram 100a of a current sensor according to an embodiment of the invention. The current sensor 100a shown in fig. 1 includes a current carrying conductor 101 and a first magnetic sensor 102.
The current-carrying conductor 101 is used for providing a flow channel for a current I to be measured, so that the current I to be measured can flow through the current-carrying conductor 101. The current carrying conductor 101 includes a first leg portion 101a, a second leg portion 101b, and a connecting portion 101c between the first leg portion 101a and the second leg portion 101 b.
In the embodiment shown in fig. 1, the current carrying conductor 101 is a U-shaped conductor, wherein the first leg portion 101a and the second leg portion 101b are located on the same side of the connecting portion 101 c; one end of the first leg portion 101a serves as one end of the U-shaped conductor 101, and the other end of the first leg portion 101a is connected to one end of the connecting portion 101 c; one end of the second leg portion 101b serves as the other end of the U-shaped conductor 101, and the other end of the second leg portion 101b is connected to the other end of the connecting portion 101 c.
The current I to be measured flows in from one end of the first leg 101a, sequentially flows through the first leg 101a, the connecting portion 101c, and the second leg 101b, and flows out from one end of the second leg 101 b.
The first magnetic sensor 102 is located around the current-carrying conductor 101, and detects the measured current I from a magnetic field (or magnetic induction) generated by the current in the current-carrying conductor 101.
Please refer to fig. 2, which is a cross-sectional view 100b along the line a-a of fig. 1. In the embodiment shown in fig. 1 and 2, the first magnetic sensor 102 is a magnetoresistive sensor including a first magnetoresistive sensor cell 102a and a second magnetoresistive sensor cell 102 b. The first magnetoresistive sensor cell 102a is positioned above the first leg 101a, and the second magnetoresistive sensor cell 102b is positioned below the first leg 101 a; the first magnetoresistive sensor cell 102a and the second magnetoresistive sensor cell 102b are oppositely arranged; the distance between the first magnetoresistive sensor cell 102a and the second magnetoresistive sensor cell 102b is very close.
The current I in the current carrying conductor 101 generates a magnetic field H at the first magnetoresistive sensor cell 102a11A magnetic field-H is generated at the second magnetoresistive sensor cell 102b12. The output of the first magnetoresistive sensor cell 102a is V11＝S[(H11/I)I+H0]Where S is the sensitivity of the magnetoresistive sensor cell with respect to the magnetic field, H0An external magnetic field; the output of the second magnetoresistive sensor cell 102b is V12＝S[-(H12/I)I+H0](ii) a The output of the first magnetic sensor 102 is V1＝V11-V12＝S[(H11+H12)/I]I. Because the distance between the first magnetoresistive sensor unit 102a and the second magnetoresistive sensor unit 102b is very close, the current sensor 100a has very strong suppression capability to the non-uniform external magnetic field, and the detection accuracy of the current sensor 100a in the environment of the non-uniform external magnetic field is improved.
Since the first leg 101a and the second leg 101b are opposite to each other, in another implementation, the first magnetoresistive sensor unit 102a may be located above the second leg 101b, and the second magnetoresistive sensor unit 102b may be located below the second leg 101b to form a differential output, which is not described herein again.
Fig. 3 is a schematic structural diagram 200a of a current sensor according to another embodiment of the present invention. The current sensor 200a shown in fig. 3 includes a current carrying conductor 201, a first magnetic sensor 202, and a second magnetic sensor 203. Fig. 3 differs from fig. 1 in that fig. 3 adds a second magnetic sensor 203 to the current sensor shown in fig. 1.
The current carrying conductor 201 is used for providing a flow channel for a measured current I, so that the measured current I can flow through the current carrying conductor 201. The current carrying conductor 201 includes a first leg 201a, a second leg 201b, and a connection portion 201c between the first and second legs 201a, 201 b.
In the embodiment shown in fig. 3, the current carrying conductor 201 is a U-shaped conductor, wherein the first leg portion 201a and the second leg portion 201b are located on the same side of the connecting portion 201 c; one end of the first leg portion 201a serves as one end of the U-shaped conductor 201, and the other end of the first leg portion 201a is connected to one end of the connecting portion 201 c; one end of the second leg portion 201b serves as the other end of the U-shaped conductor 201, and the other end of the second leg portion 201b is connected to the other end of the connecting portion 201 c.
The current I to be measured flows in from one end of the first leg 201a, sequentially flows through the first leg 201a, the connecting portion 201c, and the second leg 201b, and flows out from one end of the second leg 201 b.
The first and second magnetic sensors 202 and 203 are located around the current carrying conductor 201 and detect the measured current I from a magnetic field (or magnetic induction) generated by the current in the current carrying conductor 201.
Please refer to fig. 4, which is a cross-sectional view 200B along line B-B of fig. 3. In the embodiment shown in fig. 3 and 4, the first magnetic sensor 202 and the second magnetic sensor 203 are each a magnetoresistive sensor, and the first magnetic sensor 202 includes a first magnetoresistive sensor cell 202a and a second magnetoresistive sensor cell 202 b. The first magnetoresistive sensor unit 202a is positioned above the first leg 201a, and the second magnetoresistive sensor unit 202b is positioned below the first leg 201 a; the first magnetoresistive sensor cell 202a and the second magnetoresistive sensor cell 202b are disposed oppositely; the distance between the first magnetoresistive sensor cell 202a and the second magnetoresistive sensor cell 202b is very close. The second magnetic sensor 203 includes a third magnetoresistive sensor cell 203a and a fourth magnetoresistive sensor cell 203 b. The third magnetoresistive sensor unit 203a is positioned below the second leg 201b, and the fourth magnetoresistive sensor unit 203b is positioned above the second leg 201 b; the third magnetoresistive sensor cell 203a and the fourth magnetoresistive sensor cell 203b are oppositely disposed; the distance between the third magnetoresistive sensor cell 203a and the fourth magnetoresistive sensor cell 203b is very close.
The current I in the current carrying conductor 201 generates a magnetic field H at the first magnetoresistive sensor cell 202a11A magnetic field-H is generated at the second magnetoresistive sensor cell 202b12A magnetic field H is generated at the third magnetoresistive sensor cell 203a21A magnetic field-H is generated at the fourth magnetoresistive sensor cell 203b22. The output of the first magnetoresistive sensor cell 202a is V11＝S[(H11/I)I+H0]Where S is the sensitivity of the magnetoresistive sensor cell with respect to the magnetic field, H0An external magnetic field; the output of the second magnetoresistive sensor cell 202b is V12＝S[-(H12/I)I+H0](ii) a The output of the first magnetic sensor 202 is V1＝V11-V12＝S[(H11+H12)/I]I. The output of the third magnetoresistive sensor unit 203a is V21＝S[(H21/I)I+H0]Where S is the sensitivity of the magnetoresistive sensor cell with respect to the magnetic field, H0An external magnetic field; the output of the fourth magnetoresistive sensor unit 203b is V22＝S[-(H22/I)I+H0](ii) a The output of the second magnetic sensor 203 is V2＝V21-V22＝S[(H21+H22)/I]I. The average value of the outputs of the first and second magnetic sensors 202 and 203 is V ═ V (V ═ V)1+V2)/2. In one embodiment, the differential output of the first magnetic sensor and the differential output of the second magnetic sensor are averaged by a signal processing circuit (not shown), i.e., V ═ V (V ═ V-1+V2)/2。
Because the first magnetoresistive sensor unit 202a and the second magnetoresistive sensor unit 202b are close to each other, and the third magnetoresistive sensor unit 203a and the fourth magnetoresistive sensor unit 203b are close to each other, the current sensor 200a has strong suppression capability on the non-uniform external magnetic field, and the detection accuracy of the current sensor 200a in the non-uniform external magnetic field environment is improved.
The "U-shaped" herein refers to a shape similar to U in a broad sense, and does not need to be strictly consistent with the shape of the letter U, and certain modifications can be made. That is, the U-shaped conductors 101, 201 in fig. 1 and 3 may be standard U-shaped conductors or U-like shaped conductors.
In the present invention, the terms "connected", "connecting", and the like mean electrical connections, and direct or indirect electrical connections unless otherwise specified.
The above description is only a preferred embodiment of the present invention, and the scope of the present invention is not limited to the above embodiment, but equivalent modifications or changes made by those skilled in the art according to the present disclosure should be included in the scope of the present invention as set forth in the appended claims.

Claims (6)

1. A current sensor for detecting a current to be measured based on magnetic induction generated by the current to be measured, comprising:
a current-carrying conductor for providing a flow path for the current to be measured, the current-carrying conductor comprising a first leg, a second leg, and a connection between the first and second legs;
a first magnetic sensor comprising a first magnetic sensor cell and a second magnetic sensor cell, the first and second magnetic sensor cells being located above and below the first leg, respectively, to form a differential output.
2. The current sensor of claim 1, further comprising a second magnetic sensor,
the second magnetic sensor includes a third magnetic sensor cell and a fourth magnetic sensor cell,
the third and fourth magnetic sensor units are located below and above the second leg, respectively, to form a differential output.
3. The current sensor of claim 2,
the first sensor unit and the second magnetic sensor unit are arranged oppositely;
the third sensor unit and the fourth magnetic sensor unit are disposed opposite to each other.
4. The current sensor of claim 2,
the first magnetic sensor and the second magnetic sensor are both magneto-resistance sensors.
5. The current sensor of claim 2, further comprising a signal processing circuit,
the signal processing circuit averages the differential output of the first magnetic sensor and the differential output of the second magnetic sensor.
6. The current sensor of claim 1,
the first leg and the second leg are located on the same side of the connecting portion;
one end of the first leg portion serves as one end of the current-carrying conductor, and the other end of the first leg portion is connected with one end of the connecting portion;
one end of the second leg portion serves as the other end of the current-carrying conductor, and the other end of the second leg portion is connected with the other end of the connecting portion.
CN202010478174.4A 2020-05-29 2020-05-29 Current sensor Pending CN111624386A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010478174.4A CN111624386A (en) 2020-05-29 2020-05-29 Current sensor

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Application Number Priority Date Filing Date Title
CN202010478174.4A CN111624386A (en) 2020-05-29 2020-05-29 Current sensor

Publications (1)

Publication Number Publication Date
CN111624386A true CN111624386A (en) 2020-09-04

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113917215A (en) * 2021-10-08 2022-01-11 江苏多维科技有限公司 Current sensor

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113917215A (en) * 2021-10-08 2022-01-11 江苏多维科技有限公司 Current sensor
WO2023056828A1 (en) * 2021-10-08 2023-04-13 江苏多维科技有限公司 Current sensor
CN113917215B (en) * 2021-10-08 2024-01-12 江苏多维科技有限公司 Current sensor

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