Multi-air-gap Hall current sensor

Abstract

The utility model discloses a multi-air-gap Hall current sensor, which comprises a plastic shell, two sections of equally divided magnetic cores are arranged in the plastic shell, the rear ends of the magnetic cores are provided with a PCB (Printed Circuit Board), the magnetic cores and the PCB are pressed into the plastic shell through pouring sealant, a Hall element is arranged on the PCB, and the plastic shell is provided with an overflowing hole which is integrally formed with the plastic shell; when in use, an over-current cable is connected to the over-current hole. According to the utility model, the pouring sealant is arranged, so that the magnetic core and the plastic shell are tightly combined, and the production efficiency and the qualified rate of finished products are improved; meanwhile, the design of the upper magnetic core and the lower magnetic core is adopted, so that a large channel structure with two air gaps which are consistent in size and symmetrical up and down is formed, large-current detection is achieved, the problem of limitation of installation space is solved, the use cost of a client side is reduced, in addition, due to the fact that the total air gap is equally distributed in two positions, the air gap size is relatively small, and the detection precision is high. And the anti-interference performance to a peripheral interference magnetic field is greatly improved.

Description

Technical Field

[0001] The utility model relates to the relevant field of current sensor technology, in particular to a multi-air-gap Hall current sensor. Background Art

[0002] Existing Hall current sensors are of two types: open-loop and closed-loop. Open-loop Hall current sensors have simple processes, low costs, and a variety of installation methods. They can measure large currents and are easy to produce and apply. Existing open-loop Hall current sensors with small currents and small structures are generally single-gap single-Hall structures. When the small structure type is used in the client, it has little effect when the through-current cable is not in the center of the through-current hole. However, for products with large structures, especially when the through-current hole is square or other special-shaped, it has a great effect when the through-current cable is not in the center of the through-current hole, causing the accuracy error of the sensor detecting current to exceed the accuracy requirement range. In addition, since the product is designed with a single air gap, the core air gap needs to be enlarged when detecting large currents, and the anti-interference performance to the external magnetic field is very poor. Utility Model Content

[0003] The main purpose of the utility model is to overcome the deficiencies of the prior art and provide a multi-air-gap Hall current sensor.

[0004] The utility model is implemented by the following technical scheme: a multi-air-gap Hall current sensor, the structure of which includes a plastic shell, two equally divided magnetic cores are arranged inside the plastic shell, a PCB circuit board is arranged at the rear end of the magnetic core, the magnetic core and the PCB circuit board are pressed into the plastic shell by potting glue, a Hall element is installed on the PCB circuit board, and the plastic shell is provided with a flow hole integrally formed therewith; when in use, the flow hole is connected to a flow cable.

[0005] Furthermore, the plastic shell is a square structure.

[0006] Furthermore, the magnetic core is vertically symmetrically arranged to form two vertically symmetrical air gaps.

[0007] Furthermore, electronic components are installed on the PCB circuit board. There are two Hall elements installed on the PCB circuit board, and they are respectively arranged corresponding to the two air gaps.

[0008] Furthermore, a Hall electronic element socket connector is provided on the PCB circuit board to facilitate installation of the Hall element.

[0009] Furthermore, a socket connector is provided at the bottom of the PCB circuit board, and the socket connector is clamped with a mounting groove on one side of the bottom of the plastic shell after assembly, and the other side of the bottom of the plastic shell is locked inwardly by a locking bolt.

[0010] Beneficial Effects

[0011] Compared with the prior art, the beneficial effects of the utility model are as follows: the utility model sets a potting glue and utilizes the magnetic core potting process to achieve a close combination of the magnetic core and the plastic shell, thereby solving the problems of production efficiency and finished product qualification rate; at the same time, the utility model adopts a design of an upper and lower magnetic core, thereby forming a large channel structure with two air gaps of the same size and symmetrical up and down, thereby realizing large current detection, solving the limitation of installation space and reducing client use costs. In addition, since the total air gap is evenly distributed in two positions, the air gap size is relatively small, and the anti-interference performance to the external interference magnetic field is greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Other features, objects and advantages of the present invention will become more apparent by reading the detailed description of non-limiting embodiments with reference to the following drawings:

[0013] Figure 1 It is an exploded view of the utility model.

[0014] Figure 2 It is a schematic diagram of the structure of the utility model after assembly.

[0015] Figure 3 for Figure 1 Front view of .

[0016] In the figure: 1. Plastic shell; 11. Locking bolt; 12. Current hole; 2. Magnetic core; 3. PCB circuit board; 4. Hall electronic component socket connector; 5. Potting glue; 6. Socket connector. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0018] See also Figure 1-3The utility model provides a technical solution for a multi-air-gap Hall current sensor: a multi-air-gap Hall current sensor, the structure of which includes a plastic shell 1, wherein the plastic shell 1 is a square structure; two equally divided magnetic cores 2 are arranged inside the plastic shell 1, and the magnetic cores 2 are symmetrically arranged up and down to facilitate the formation of two symmetrical air gaps; a PCB circuit board 3 is arranged at the rear end of the magnetic core 2, and electronic components are also installed on the PCB circuit board 3. There are two Hall elements installed on the PCB circuit board 3, and they are respectively arranged corresponding to the two air gaps. At the same time, a Hall electronic element socket connector 4 is provided on the PCB circuit board 3 for facilitating the installation of the Hall element, so that the Hall element can be better installed.

[0019] See attached for details Figure 2 and 3 The magnetic core 2 and the PCB circuit board 3 are both pressed into the plastic shell 1 through the potting glue 5, the PCB circuit board 3 is mounted with a Hall element, and the plastic shell 1 is provided with a flow hole 12 integrally formed therewith; when in use, the flow hole 12 is connected to the flow cable; in order to facilitate the assembly of the PCB circuit board 3 and the plastic shell 1, a socket connector 6 is provided at the bottom of the PCB circuit board 3, and the socket connector 6 is clamped with the mounting groove on one side of the bottom of the plastic shell 1 after assembly, and the other side of the bottom of the plastic shell 1 is locked inwardly by a locking bolt 11, thereby realizing double-sided reinforcement.

[0020] The working principle of the multi-air-gap Hall current sensor of the utility model is as follows:

[0021] When the multi-gap Hall current sensor is used, when current flows through the overcurrent cable (not shown in the figure), a magnetic field with the same magnitude and direction as the current is generated. The magnetic core 2 collects the magnetic field signal and generates a corresponding magnetic flux in the core air gap. The Hall element on the PCB circuit board 3 detects the magnetic flux in the core air gap and converts it into a differential signal, which is then amplified by the back-end circuit and outputs a signal that is linearly related to the sum of the magnetic flux in the two core air gaps. The client collects this signal and can monitor the changes in the primary current in real time. Because there are detection air gaps designed at both ends of the overcurrent cable, when the overcurrent cable is not in the center of the overcurrent hole, the detection accuracy of the product will not change much. At the same time, because the total air gap is evenly distributed in two positions (divided into two air gaps in the figure), the air gap size is relatively small, and the anti-interference performance against external interference magnetic fields is greatly improved.

[0022] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art may still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A multi-air-gap Hall current sensor, characterized in that: The structure comprises a plastic shell (1), wherein two equally divided magnetic cores (2) are arranged inside the plastic shell (1), a PCB circuit board (3) is arranged at the rear end of the magnetic core (2), the magnetic core (2) and the PCB circuit board (3) are both pressed into the plastic shell (1) through a potting glue (5), a Hall element is mounted on the PCB circuit board (3), and the plastic shell (1) is provided with a flow hole (12) integrally formed therewith; when in use, a flow cable is connected to the flow hole (12).

2. The multi-air-gap Hall current sensor according to claim 1, characterized in that: The plastic shell (1) is a square structure.

3. The multi-air-gap Hall current sensor according to claim 1, characterized in that: The magnetic core (2) is arranged symmetrically up and down, and forms two symmetrical air gaps up and down.

4. The multi-air-gap Hall current sensor according to claim 3, characterized in that: Electronic components are also installed on the PCB circuit board (3), and there are two Hall elements installed on the PCB circuit board (3), which are respectively arranged corresponding to the two air gaps.

5. The multi-air-gap Hall current sensor according to claim 4, characterized in that: The PCB circuit board (3) is provided with a Hall electronic element socket connector (4) for facilitating installation of the Hall element.

6. The multi-air-gap Hall current sensor according to claim 1, characterized in that: A socket connector (6) is provided at the bottom of the PCB circuit board (3). After assembly, the socket connector (6) is clamped in cooperation with a mounting groove on one side of the bottom of the plastic shell (1). The other side of the bottom of the plastic shell (1) is locked inwardly by a locking bolt (11).

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