阅读说明：本技术 一种高抗干扰霍尔传感器 (High anti-interference Hall sensor ) 是由 刘玉正 唐新颖 于 2020-12-21 设计创作，主要内容包括：一种高抗干扰霍尔传感器,包括：外壳,所述外壳中部凸起有母线绕线部,所述母线绕线部中部中空；聚磁环,绕设在所述母线绕线部外周,其一侧设有缺口；PCB板,设置在所述聚磁环一端上,其电性连接有霍尔元件、调节电位器以及功能端子,所述霍尔元件位于所述缺口内,以采集缺口内的磁通量,并传输至所述PCB板最后通过功能端子输出,所述调节电位器设有两个,并对称设置在所述PCB板的一端面上。用于调节霍尔元件的驱动电流；灌封层,设置在所述外壳的一端上,本发明的的电流传感器具有高精度高抗扰能力的优点,并且成本低,工艺简单,防止受到外围磁场的干扰影响检测精度。(A high interference rejection hall sensor, comprising: the middle part of the shell is provided with a bus winding part in a protruding mode, and the middle part of the bus winding part is hollow; the magnetic gathering ring is wound on the periphery of the bus winding part, and one side of the magnetic gathering ring is provided with a notch; the PCB is arranged at one end of the magnetic gathering ring, the Hall element, the adjusting potentiometer and the functional terminal are electrically connected to the PCB, the Hall element is located in the notch to collect magnetic flux in the notch and transmit the magnetic flux to the PCB, and the magnetic flux is finally output through the functional terminal, and the two adjusting potentiometers are symmetrically arranged on one end face of the PCB. A drive current for adjusting the Hall element; the current sensor has the advantages of high precision and high anti-interference capability, and is low in cost and simple in process, and the detection precision is prevented from being influenced by the interference of a peripheral magnetic field.)

1. The utility model provides a high anti-interference hall sensor which characterized in that: the method comprises the following steps:

the bus winding device comprises a shell (1), wherein a bus winding part (101) protrudes from the middle of the shell (1), and the middle of the bus winding part (101) is hollow;

the magnetic gathering ring (2) is wound on the periphery of the bus winding part (101), and one side of the magnetic gathering ring is provided with a notch;

the PCB (3) is arranged at one end of the magnetic gathering ring (2), and is electrically connected with a Hall element (4), an adjusting potentiometer (5) and a functional terminal (7), wherein the Hall element (4) is positioned in the gap to collect magnetic flux in the gap and transmit the magnetic flux to the PCB (3) which is finally output through the functional terminal (7), and the two adjusting potentiometers (5) are symmetrically arranged on one end face of the PCB (3). For adjusting the drive current of the Hall element (4);

and the encapsulating layer (6) is arranged on one end of the shell (1).

2. The hall sensor with high interference resistance according to claim 1, wherein: the PCB (3) is provided with a constant current driving module, the constant current driving module comprises an input end (301) connected with the adjusting potentiometer (5), the adjusting potentiometer (5) is connected to an emitter of a triode Q1 through a resistor R2, a collector of the triode Q1 is connected with the Hall element (4), a base of the triode Q1 is connected to the emitter of the triode Q2, the collector of the triode Q2 is grounded through a resistor R1, and the base of the triode Q2 is connected with the emitter.

3. The hall sensor with high interference resistance according to claim 2, wherein: and on the PCB (3), the copper foil of the positive and negative power supply wire or the copper foil of the ground wire surrounds the welding disc feet of the Hall element (4) in a semi-surrounding or full-surrounding mode.

4. The hall sensor with high interference resistance according to claim 2, wherein: the driving current generated by the constant current driving module is between 3 and 10 mA.

5. The hall sensor with high interference resistance according to claim 2, wherein: on the PCB (3), the Hall element (4) is directly wrapped by a layer of copper foil, and then the copper foil is grounded.

Technical Field

The invention relates to the field of current sensors, in particular to a high-interference-resistance Hall sensor.

Background

The existing Hall current sensor has two types of open loop and closed loop, the open loop Hall current sensor has simple process, low cost and diversified installation mode, the measured current is larger, and the Hall current sensor is convenient to produce and apply; the closed-loop Hall current sensor has the advantages of relatively complex process, high cost, high precision and quick response time. However, in both open-loop and closed-loop hall current sensors, the main sensitive device is a hall element, which belongs to a semiconductor material and is a sensitive material, and when the hall current sensor works in an environment with a strong peripheral interference magnetic field, the hall element is easily interfered by the peripheral magnetic field or peripheral electronic signals, so that the performance of products is reduced.

Disclosure of Invention

In order to solve the problems, the technical scheme provides the high-interference-resistance Hall sensor which can improve the product precision and the anti-interference capability of the product.

In order to achieve the purpose, the technical scheme is as follows:

a high interference rejection hall sensor, comprising:

the middle part of the shell is provided with a bus winding part in a protruding mode, and the middle part of the bus winding part is hollow;

the magnetic gathering ring is wound on the periphery of the bus winding part, and one side of the magnetic gathering ring is provided with a notch;

the PCB is arranged at one end of the magnetic gathering ring, the Hall element, the adjusting potentiometer and the functional terminal are electrically connected to the PCB, the Hall element is located in the notch to collect magnetic flux in the notch and transmit the magnetic flux to the PCB, and the magnetic flux is finally output through the functional terminal, and the two adjusting potentiometers are symmetrically arranged on one end face of the PCB. A drive current for adjusting the Hall element;

and the encapsulating layer is arranged on one end of the shell.

In some embodiments, the PCB is provided with a constant current driving module, the constant current driving module includes an input end connected to the adjustment potentiometer, the adjustment potentiometer is connected to an emitter of a transistor Q1 through a resistor R2, a collector of the transistor Q1 is connected to the hall element, a base of the transistor Q1 is connected to the emitter of the transistor Q2, a collector of the transistor Q2 is grounded through a resistor R1, and a base of the transistor Q2 is connected to the emitter.

In some embodiments, the pad legs of the hall element are surrounded by copper foils of the positive and negative power traces or copper foils of the ground traces in a semi-surrounding or fully-surrounding manner on the PCB board.

In some embodiments, the driving current generated by the constant current driving module is between 3 and 10 mA.

In some embodiments, the hall element is directly wrapped by a layer of copper foil on the PCB, and the copper foil is grounded.

The beneficial effect of this application does: the current sensor has the advantages of high precision and high anti-interference capability, is low in cost and simple in process, and prevents the detection precision from being influenced by the interference of a peripheral magnetic field.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below.

FIG. 1 is a schematic structural diagram of an embodiment of the present invention;

FIG. 2 is an exploded view of an embodiment of the present invention;

FIG. 3 is a first schematic diagram of a PCB layout structure according to an embodiment of the present invention;

FIG. 4 is a second schematic diagram of a PCB layout structure according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a constant current driving module according to an embodiment of the present invention.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Referring to fig. 1-5, a hall sensor with high interference resistance includes:

the bus winding device comprises a shell 1, wherein a bus winding part 101 protrudes from the middle of the shell 1, and the middle of the bus winding part 101 is hollow;

the magnetic gathering ring 2 is wound on the periphery of the bus winding part 101, and one side of the magnetic gathering ring is provided with a notch;

the PCB 3 is arranged at one end of the magnetic gathering ring 2, and is electrically connected with a Hall element 4, an adjusting potentiometer 5 and a functional terminal 7, the Hall element 4 is located in the notch to collect magnetic flux in the notch and transmit the magnetic flux to the PCB 3 to be finally output through the functional terminal 7, and the two adjusting potentiometers 5 are symmetrically arranged on one end face of the PCB 3. For adjusting the drive current of the hall element 4;

and the encapsulating layer 6 is arranged at one end of the shell 1.

In the structural design, a magnetic gathering ring is assembled through a plastic shell (shell), a proper air gap (notch) is arranged on the magnetic gathering ring, a Hall element and a rear end processing circuit are attached to a PCB, an electronic element, a potentiometer and a functional terminal are attached to the PCB, the Hall element body is arranged in the air gap of the magnetic gathering ring, a primary side bus penetrates into a hole in the plastic shell provided with the magnetic gathering ring and the PCB in a perforation way, when current passes through the primary side bus, a magnetic field which is in linear relation with the current at the periphery of the bus, the magnetic field is collected by the magnetic gathering ring, a Hall element arranged in an air gap of the magnetic gathering ring collects the magnetic flux in the air gap, the voltage is transmitted to an amplification processing circuit at the rear end, and is directly output to a system end after being amplified, and the signal can feed back the change of the magnitude and the direction of the primary current in real time;

in principle design, a core device Hall element is subjected to constant current driving, the optimal driving current of the Hall element is 5mA, the constant current is adjusted within the range of 3-10mA in principle by adjusting a potentiometer, the output gain value of the Hall element can be adjusted by adjusting the driving current of the Hall element, the output of the Hall element is sent to a rear-end amplifying circuit, and the output signal of the amplifying circuit changes in magnitude and is in linear proportional relation with the magnitude of primary side current; when the layout of the PCB is designed, the sensitive device Hall element wraps the pins of the Hall element in a semi-surrounding or fully-surrounding mode by using the wiring of a positive power supply or the wiring of a ground wire, so that the peripheral interference source of the Hall element is absorbed between the positive power supply and the negative power supply or absorbed on the ground wire for release, and through the mode, other interference signals from the peripheral interference or the PCB are released, thereby ensuring that the signals output by the Hall element are not influenced by the interference source, ensuring the accuracy of a rear-end signal processing circuit and improving the performance of a product.

In this embodiment, the PCB 3 is provided with a constant current driving module, the constant current driving module includes an input end 301 connected to the adjustment potentiometer 5, the adjustment potentiometer 5 is connected to an emitter of a transistor Q1 through a resistor R2, a collector of the transistor Q1 is connected to the hall element 4, a base of the transistor Q1 is connected to the emitter of the transistor Q2, a collector of the transistor Q2 is grounded through a resistor R1, a base of the transistor Q2 is connected to the emitter, the transistor Q1 and the transistor Q2 form an amplifying circuit, and the adjustment potentiometer is used to adjust an input current.

In this embodiment, on the PCB 3, the copper foil of the positive and negative power traces or the copper foil of the ground trace surrounds the pad pin of the hall element 4 in a semi-surrounding or fully-surrounding manner, as shown in fig. 3 and 4, so that the interference source around the hall element is absorbed between the positive and negative power sources or absorbed on the ground for release, and by this manner, the interference from the periphery or other interference signals on the PCB are released, thereby ensuring that the signals output by the hall element are not affected by the interference source, ensuring the accuracy of the rear-end signal processing circuit, and improving the product performance.

In the embodiment, the driving current generated by the constant current driving module is between 3 and 10 mA.

In this embodiment, the hall element 4 is directly wrapped by a layer of copper foil on the PCB 3, and then the copper foil is grounded, or a layer of copper foil is designed on the PCB layout, the hall element is directly wrapped by the copper foil, and the copper foil is grounded, so that the peripheral interference source can be absorbed on the ground for release.

The above description is only for the purpose of illustrating the preferred embodiments of the present application and is not intended to limit the scope of the present application, which is within the scope of the present application, except that the same or similar principles and basic structures as the present application may be used.