CN111551768A - Current sensor - Google Patents

Current sensor Download PDF

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Publication number
CN111551768A
CN111551768A CN202010506067.8A CN202010506067A CN111551768A CN 111551768 A CN111551768 A CN 111551768A CN 202010506067 A CN202010506067 A CN 202010506067A CN 111551768 A CN111551768 A CN 111551768A
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China
Prior art keywords
current
magnetic
sensor
magneto
leg
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Pending
Application number
CN202010506067.8A
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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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Priority to CN202010506067.8A priority Critical patent/CN111551768A/en
Publication of CN111551768A publication Critical patent/CN111551768A/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 invention provides a current sensor, which comprises a current-carrying conductor, a magnetic sensor and a soft magnet, wherein the current-carrying conductor is used for providing a flowing channel for a current to be measured; the magnetic sensor is positioned around the current carrying conductor and detects the current to be measured according to a magnetic field at the magnetic sensor; the soft-magnetic body is located around the magnetic sensor for amplifying a magnetic field generated at the magnetic sensor by a current in the current carrying conductor. Compared with the prior art, the current sensor is additionally provided with the soft magnet, and the soft magnet plays a role in amplifying the magnetic field generated by the current in the current-carrying conductor at the position of the magnetic sensor, so that the sensitivity of the current sensor is increased, and the detection of smaller current is realized.

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 with high sensitivity.
[ background of the invention ]
Current sensors for measuring the magnitude of current are widely used in various electronic devices. A traditional magnetic resistance current sensor comprises a U-shaped current-carrying conductor and a magnetic resistance sensor. How to further improve the sensitivity of the magneto-resistance current sensor, so as to realize the detection of smaller current, is always a difficult point.
Therefore, it is necessary to provide a technical solution to solve the above problems.
[ summary of the invention ]
It is an object of the present invention to provide a current sensor which can increase the sensitivity of the current sensor, thereby achieving detection of a smaller current.
According to one aspect of the present invention, the present invention provides a current sensor comprising a current carrying conductor for providing a passage for a current to be measured to flow through, a magnetic sensor and a soft-magnetic body; the magnetic sensor is positioned around the current carrying conductor and detects the current to be measured according to a magnetic field at the magnetic sensor; the soft-magnetic body is located around the magnetic sensor for amplifying a magnetic field generated at the magnetic sensor by a current in the current carrying conductor.
Further, the magnetic sensor is a magnetoresistive sensor, which includes a first magnetoresistive sensor unit and a second magnetoresistive sensor unit, and the first magnetoresistive sensor unit and the second magnetoresistive sensor unit are used for forming differential output; the soft magnet comprises a first soft magnet unit and a second soft magnet unit, the first soft magnet unit is located around the first magneto-resistance sensor unit, and the second soft magnet unit is located around the second magneto-resistance sensor unit.
Further, the first soft-magnetic body unit is positioned at one side of the first magneto-resistance sensor unit; the second soft-magnetic cell is located on the other side of the second magnetoresistive sensor cell.
Further, the current carrying conductor includes a first leg portion, a second leg portion, and a connecting portion, the first leg portion and the second leg portion being 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.
Further, the first magnetic resistance sensor unit and the second magnetic resistance sensor unit are respectively positioned above the first leg part and the second leg part: or the first magnetic resistance sensor unit and the second magnetic resistance sensor unit are respectively positioned below the first leg part and the second leg part.
Further, one side of the first magnetoresistive sensor unit is: the side opposite to the side where the second magneto-resistance sensor unit is located; the other side of the second magneto-resistance sensor unit is: and the side opposite to the side where the first magneto-resistance sensor unit is located.
Further, the soft magnet is made of a soft magnetic material with high magnetic permeability.
Further, the magneto-resistance sensor is an anisotropic magneto-resistance, giant magneto-resistance or tunneling magneto-resistance sensor.
Compared with the prior art, the current sensor comprises a current-carrying conductor, a magnetic sensor and a soft magnet, wherein the soft magnet plays a role in amplifying a magnetic field generated by current in the current-carrying conductor at the magnetic sensor, so that the sensitivity of the current sensor is increased, and the detection of smaller current is realized.
[ 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 conventional current sensor;
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 in one embodiment of the 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 is a schematic structural diagram 100a of a conventional current sensor. The current sensor 100a shown in FIG. 1 includes a current carrying conductor 101 and a magnetoresistive sensor 102. The current carrying 101 includes a first leg 101a, a second leg 101b, and a connection 101c between the first leg 101a and the second leg 101 b.
Please refer to fig. 2, which is a cross-sectional view 100b along the line a-a of fig. 1. The magnetoresistive sensor 102 includes a first magnetoresistive sensor cell 102a and a second magnetoresistive sensor cell 102 b. 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 magnetoresistive sensor 102 is V1＝V11-V12＝S[(H11+H12)/I]I。
Fig. 3 is a schematic structural diagram 200a of a current sensor according to an embodiment of the present invention; please refer to fig. 4, which is a cross-sectional view 200B along line B-B of fig. 3. As can be seen from fig. 3 and 4, the current sensor shown in fig. 3 comprises a current carrying conductor 201, a magnetic sensor 202 and a soft-magnetic body 203.
The current-carrying conductor 201 is used for providing a flowing channel for a measured current I, so that the measured current I can flow through the current-carrying conductor 201; the soft-magnetic body 203 is located around the magnetic sensor 202 for amplifying the magnetic field (or magnetic induction) generated at the magnetic sensor 202 by the current I in the current carrying conductor 201; the magnetic sensor 202 is located around the current carrying conductor 201 and detects the current I to be measured from the magnetic field at the magnetic sensor 202.
The current carrying conductor 201 is a U-shaped conductor. The current carrying conductor 201 includes a first leg 201a, a second leg 201b, and a connection portion 201c between the first leg 201a and the second leg 201 b. The first leg portion 201a and the second leg portion 201b are located on the same side of the connection portion 201c, one end of the first leg portion 201a serves as one end of the current-carrying conductor 201, and the other end of the first leg portion 201a is connected to one end of the connection portion 201 c; one end of the second leg portion 201b serves as the other end of the current-carrying conductor 201, and the other end of the second leg portion 201b is connected to the other end of the connection portion 201 c. In the particular embodiment shown in fig. 3, the first leg 201a and the second leg 201b are both straight conductors.
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 magnetic sensor 202 is a magnetoresistive sensor, and includes a first magnetoresistive sensor unit 202a and a second magnetoresistive sensor unit 202b, and the first magnetoresistive sensor unit 202a and the second magnetoresistive sensor unit 202b are located around the U-shaped conductor 201 to form a differential output. In one embodiment, the magnetoresistive sensor 202 may be an Anisotropic Magnetoresistive (AMR), Giant Magnetoresistive (GMR), or Tunneling Magnetoresistive (TMR) sensor.
In the particular embodiment shown in fig. 3, a first magnetoresistive sensor cell 202a is located above the first leg 201 a; a second magnetoresistive sensor cell 202b is located above the second leg 201 b.
The soft-magnetic body 203 comprises a first soft-magnetic body cell 203a and a second soft-magnetic body cell 203b, the first soft-magnetic body cell 203a is located around the first magneto-resistive sensor cell 202a, and the second soft-magnetic body cell 203b is located around the second magneto-resistive sensor cell 202 b. In a preferred embodiment, the first soft-magnetic element 203a and the second soft-magnetic element 203b are made of a soft magnetic material with a high magnetic permeability.
In the particular embodiment shown in FIG. 3, the first soft-magnetic cell 203a is located above the first leg 201a and to the left (or side) of the first magnetoresistive sensor cell 202 a; a second soft-magnetic cell 203b is located above the second leg 201b and to the right (or side) of the second magnetoresistive sensor cell 202 b. Wherein, the left side (or one side) of the first magnetoresistive sensor unit 202a is: a side opposite to the side where the second magnetoresistive sensor cell 202b is located; the right side (or one side) of the second magnetoresistive sensor unit 202b is: the side opposite to the side where the first magnetoresistive sensor cell 202a is located.
The soft-magnetic body 203 acts to amplify the magnetic field generated at the magnetoresistive sensor 202 by the current I in the current carrying conductor 201 by an amplification factor G, wherein G>1. The current I in the current carrying conductor 201, in the presence of the soft-magnetic body 203, generates a magnetic field GH at the first magnetoresistive sensor cell 202a21A magnetic field-GH is generated at the second magnetoresistive sensor cell 202b22. The output of the first magnetoresistive sensor cell 202a is V21＝S[(GH21/I)I+GH0]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 V22＝S[-(GH22/I)I+GH0](ii) a The output of the magnetoresistive sensor 202 is V2＝V21-V22＝S[G(H21+H22)/I]I. Compared with the traditional magneto-resistance current sensor, the current sensor disclosed by the invention has the advantages that the sensitivity relative to the current is improved by G times, and the detection of smaller current can be realized.
It should be particularly noted that, in another embodiment, the first magnetoresistive sensor unit 202a is located below the first leg 201 a; a second magnetoresistive sensor cell 202b is located below the second leg 201 b; a first soft-magnetic cell 203a is located below the first leg 201a and to the left (or side) of the first magnetoresistive sensor cell 202 a; the second soft-magnetic cell 203b is located below the second leg 201b and to the right (or side) of the second magnetoresistive sensor cell 202 b.
In one embodiment, the thickness of the first soft-magnetic cell 203a is greater than the thickness of the first magnetoresistive sensor cell 202 a; the thickness of the second soft-magnetic cell 203b is larger than the thickness of the second magnetoresistive sensor cell 202 b.
In summary, the current sensor in the present invention includes the current-carrying conductor 201, the magnetic sensor 202, and the soft magnetic body 203 amplifies the magnetic field generated by the current in the current-carrying conductor 201 at the position of the magnetoresistive sensor 202, so as to increase the sensitivity of the current sensor, and to realize the detection of smaller current.
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.
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 (8)

1. A current sensor, characterized in that it comprises a current carrying conductor, a magnetic sensor and a soft-magnetic body,
the current-carrying conductor is used for providing a flow channel for the current to be measured;
the magnetic sensor is positioned around the current carrying conductor and detects the current to be measured according to a magnetic field at the magnetic sensor;
the soft-magnetic body is located around the magnetic sensor for amplifying a magnetic field generated at the magnetic sensor by a current in the current carrying conductor.
2. The current sensor of claim 1,
the magnetic sensor is a magneto-resistance sensor and comprises a first magneto-resistance sensor unit and a second magneto-resistance sensor unit, and the first magneto-resistance sensor unit and the second magneto-resistance sensor unit are used for forming differential output;
the soft magnet comprises a first soft magnet unit and a second soft magnet unit, the first soft magnet unit is located around the first magneto-resistance sensor unit, and the second soft magnet unit is located around the second magneto-resistance sensor unit.
3. The current sensor of claim 2,
the first soft magnetic unit is positioned at one side of the first magneto-resistance sensor unit;
the second soft-magnetic cell is located on the other side of the second magnetoresistive sensor cell.
4. The current sensor of claim 2, wherein the current carrying conductor includes a first leg, a second leg, and a connection,
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.
5. The current sensor of claim 4,
the first magnetic resistance sensor unit and the second magnetic resistance sensor unit are respectively positioned above the first leg part and the second leg part: or
The first magnetic resistance sensor unit and the second magnetic resistance sensor unit are respectively positioned below the first leg part and the second leg part.
6. The current sensor of claim 5,
one side of the first magnetoresistive sensor unit is: the side opposite to the side where the second magneto-resistance sensor unit is located;
the other side of the second magneto-resistance sensor unit is: and the side opposite to the side where the first magneto-resistance sensor unit is located.
7. The current sensor of claim 1,
the soft magnet is made of a soft magnetic material with high magnetic permeability.
8. The current sensor of claim 3,
the magneto-resistance sensor is an anisotropic magneto-resistance, giant magneto-resistance or tunneling magneto-resistance sensor.
CN202010506067.8A 2020-06-05 2020-06-05 Current sensor Pending CN111551768A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010506067.8A CN111551768A (en) 2020-06-05 2020-06-05 Current sensor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010506067.8A CN111551768A (en) 2020-06-05 2020-06-05 Current sensor

Publications (1)

Publication Number Publication Date
CN111551768A true CN111551768A (en) 2020-08-18

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ID=72003659

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010506067.8A Pending CN111551768A (en) 2020-06-05 2020-06-05 Current sensor

Country Status (1)

Country Link
CN (1) CN111551768A (en)

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