CN111551769A - High-precision current sensor based on magnetic sensor array - Google Patents

Abstract

The present invention provides a current sensor, which includes a current-carrying conductor, a magnetic sensor array and a soft magnetic array, wherein the current-carrying conductor is used to provide a passage for a measured current to flow through; the magnetic sensor array is located on the side of the current-carrying conductor. around, the magnetic sensor array includes n magnetic sensors, n is a natural number greater than 1; the soft magnetic array is located around the current-carrying conductor, the soft magnetic array includes n soft magnetics, the magnetic sensor array At least one soft magnet is arranged between two adjacent magnetic sensors. In this way, the sensitivity of the current sensor is increased, and the accuracy of the current sensor is improved.

Description

High-precision current sensor based on magnetic sensor array

【Technical field】

The invention relates to the technical field of current sensors, in particular to a high-precision current sensor based on a magnetic sensor array.

【Background technique】

Current sensors for measuring the magnitude of current are widely used in various electronic devices. Traditional current sensors based on magnetic sensor arrays include magnetic sensor arrays and current-carrying conductors. The magnetic field generated by the current in the current-carrying conductor is induced at the magnetic sensor array, so as to achieve the purpose of detecting the current. The disadvantage is that the sensitivity is low.

Therefore, it is necessary to propose a technical solution to solve the above problems.

[Content of the invention]

One of the objectives of the present invention is to provide a high-precision current sensor based on a magnetic sensor array, which increases the sensitivity of the current sensor and improves the accuracy of the current sensor.

According to one aspect of the present invention, the present invention provides a current sensor, which includes a current-carrying conductor, a magnetic sensor array and a soft magnetic array, the current-carrying conductor is used to provide a passage for the measured current to flow through; the magnetic sensor array Located around the current-carrying conductor, the magnetic sensor array includes n magnetic sensors, where n is a natural number greater than 1; the soft magnetic array is located around the current-carrying conductor, and the soft magnetic array includes n soft magnetic sensors A magnet, at least one soft magnet is disposed between two adjacent magnetic sensors in the magnetic sensor array.

Compared with the prior art, the current sensor in the present invention includes a current-carrying conductor, a magnetic sensor array and a soft magnetic body array. The soft magnet array is used to amplify the magnetic field generated by the current in the current-carrying conductor at the magnetic sensor, thereby increasing the sensitivity of the current sensor and improving the accuracy of the current sensor.

【Description of drawings】

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without any creative effort. in:

FIG. 1 is a schematic structural diagram 100 of a conventional current sensor based on a magnetic sensor array;

FIG. 2 is a schematic structural diagram 200 of a high-precision current sensor based on a magnetic sensor array in an embodiment of the present invention;

FIG. 3 is a perspective schematic diagram 300 of the current sensor shown in FIG. 2 .

【Detailed ways】

In order to make the above objects, features and advantages of the present invention more clearly understood, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

Reference herein to "one embodiment" or "an embodiment" refers to a particular feature, structure, or characteristic that may be included in at least one implementation of the present invention. The appearances of "in one embodiment" in various places in this specification are not all referring to the same embodiment, nor are they separate or selectively mutually exclusive from other embodiments. Unless otherwise specified, the terms connected, connected, and connected herein mean electrically connected, all mean direct or indirect electrical connection.

Please refer to FIG. 1 , which is a schematic structural diagram 100 of a conventional current sensor based on a magnetic sensor array. The magnetic sensor array-based current sensor 100 shown in FIG. 1 includes a magnetic sensor array 102 and a current-carrying conductor 101 . Take the magnetic sensor array 102 including 8 magnetic sensors as an example. The magnetic sensor array 102 includes magnetic sensors 102a, 102b, 102c, 102d, 102e, 102f, 102g and 102h, the centers of the eight magnetic sensors form a circle 103, and the circumference of the circle 103 is L. The current-carrying conductors 101 are located in the area surrounded by the magnetic sensor array 102 . The current I of the current-carrying conductor 101 generates magnetic fields H ₁ , H ₂ , H ₃ , H ₄ , H ₅ , H ₆ , H ₇ and H ₈ ; the outputs of the magnetic sensors 102a, 102b, 102c, 102d, 102e, 102f, 102g and 102h are V ₁ =S(H ₁ /I)I, V ₂ =S(H ₂ /I)I, V ₃ , respectively =S(H ₃ /I)I, V ₄ =S(H ₄ /I)I, V ₅ =S(H ₅ /I)I, V ₆ =S(H ₆ /I)I, V ₇ =S (H ₇ /I)I and V ₈ =S(H ₈ /I)I, where S is the sensitivity of the magnetic sensor to the magnetic field; the output of the magnetic sensor array 102 is V=S[(H ₁ +H ₂ +H ₃ +H4 _{+ H5} + _H6 + _H7 +H8)/I]I/ ₈ =(S/L)I. A disadvantage of the conventional magnetic sensor array based current sensor 100 shown in FIG. 1 is that the sensitivity is low.

Please refer to FIG. 2 , which is a schematic structural diagram 200 of a high-precision current sensor based on a magnetic sensor array in one embodiment of the present invention; please refer to FIG. 3 , which is a three-dimensional perspective schematic diagram of the current sensor shown in FIG. 2 300. As can be seen from FIG. 2 and FIG. 3 , the current sensor 200 in the present invention includes: a magnetic sensor array 202 , a soft magnetic body array 204 and a current-carrying conductor 201 .

The current-carrying conductor 201 is used to provide a passage for the current I to be measured. In the embodiment shown in FIGS. 2 and 3 , the current-carrying conductors 201 are located in the area surrounded by the magnetic sensor array 202 . It can also be said that the current-carrying conductor 201 passes through the area surrounded by the magnetic sensor array 202 .

The magnetic sensor array 202 is located around the current-carrying conductor 201 , which detects the measured current I according to the magnetic field at the magnetic sensor array 202 . In one embodiment, the magnetic sensor array 202 includes n magnetic sensors, where n is a natural number greater than 1, and the centers of the n magnetic sensors are arranged in a first circle.

The soft magnetic array 204 is located around the current-carrying conductor 201 for amplifying the magnetic field generated at the magnetic sensor array 202 by the current in the current-carrying conductor 201 . Wherein, each soft magnet in the soft magnet array 204 is located between two adjacent magnetic sensors in the magnetic sensor array 202 . In one embodiment, the soft magnet array 204 includes n soft magnets, and the centers of the n soft magnets are arranged in a second circle. The first circle and the second circle overlap, and the perimeters of the first circle and the second circle are equal. Preferably, each soft magnet is located at the center of an arc formed by two adjacent magnetic sensors.

In the embodiments shown in FIGS. 2 and 3 , the magnetic sensor array 202 includes 8 magnetic sensors and the soft magnet array 204 includes 8 soft magnets as an example.

The magnetic sensor array 202 includes magnetic sensors 202a, 202b, 202c, 202d, 202e, 202f, 202g and 202h. The perimeter is L. The soft magnet array 204 includes soft magnets 204a, 204b, 204c, 204d, 204e, 204f, 204g and 204h, the centers of the eight soft magnets form (or are arranged in) a second circle, and the centers of the eight magnetic sensors form The first circles 203 are coincident, and each soft magnet is located at the center of the arc formed by two adjacent magnetic sensors. The current-carrying conductors 201 are located in the area surrounded by the magnetic sensor array 202 . The soft magnetic array 204 is made of a soft magnetic material with high magnetic permeability, which amplifies the magnetic field generated by the current in the current-carrying conductor 201 at the magnetic sensor array 202, and the amplification factor is G, where G>1. In the presence of the soft magnetic array 204, the current I of the current-carrying conductor 201 generates magnetic fields GH ₁ , GH ₂ , GH ₃ , GH ₄ at the magnetic sensors 202 a , 202 b , 202 c , 202 d , 202 e , 202 f , 202 g and 202 h , respectively , GH ₅ , GH ₆ , GH ₇ and GH ₈ ; the outputs of the magnetic sensors 202a, 202b, 202c, 202d, 202e, 202f, 202g and 202h are V ₁ =S(GH ₁ /I)I, V ₂ =S, respectively (GH ₂ /I)I, V ₃ =S(GH ₃ /I)I, V ₄ =S(GH ₄ /I)I, V ₅ =S(GH ₅ /I)I, V ₆ =S(GH ₆ /I)I, _V7 =S( _GH7 /I)I and _V8 =S( _GH8 /I)I, where S is the sensitivity of the magnetic sensor to the magnetic field; the output of the magnetic sensor array 202 is V= S[G(H ₁ +H ₂ +H ₃ +H ₄ +H ₅ +H ₆ +H ₇ +H ₈ )/I]I/8=(GS/L)I.

Compared with the conventional magnetic sensor array-based current sensor 100 shown in FIG. 1 , the magnetic sensor array-based high-precision current sensor 200 in the present invention increases the sensitivity relative to current by G times and improves the accuracy of the current sensor.

In the present invention, "connected", "connected", "connected", "connected" and other words refer to electrical connection, and unless otherwise specified, refer to direct or indirect electrical connection.

The above descriptions are only the preferred embodiments of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, but any equivalent modifications or changes made by those of ordinary skill in the art according to the disclosure of the present invention shall be included in the rights within the scope of protection stated in the request.

Claims (6)

1. A current sensor comprising a current carrying conductor, an array of magnetic sensors and an array of soft magnets,

the current-carrying conductor is used for providing a flow channel for the current to be measured;

the magnetic sensor array is positioned around the current-carrying conductor and comprises n magnetic sensors, wherein n is a natural number greater than 1;

the soft magnet array is located around the current-carrying conductor and comprises n soft magnets, and at least one soft magnet is arranged between every two adjacent magnetic sensors in the magnetic sensor array.

2. The current sensor of claim 1,

the current carrying conductor is located within a region surrounded by the magnetic sensor array;

the magnetic sensor array detects the current to be measured from a magnetic field at the magnetic sensor array,

the soft magnetic array is used for amplifying a magnetic field generated by current in the current carrying conductor at the magnetic sensor array.

3. The current sensor of claim 2,

the centers of the n magnetic sensors are arranged in a first circle;

the centers of the n soft magnets are arranged in a second circle.

4. The current sensor of claim 3,

the first circle and the second circle coincide;

the first circle and the second circle have equal circumferences.

5. The current sensor of claim 3,

each soft-magnetic body is located at the center of an arc formed by two adjacent magnetic sensors.

6. The current sensor of claim 2,

the soft magnet array is made of a soft magnetic material with high magnetic permeability.

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