A dual Hall current sensor

Abstract

The utility model discloses a dual Hall current sensor, comprising: a housing, two U-shaped open magnetic cores arranged in the housing, and two Hall elements; the openings of the two U-shaped open magnetic cores are arranged opposite to each other, the gap between the two U-shaped open magnetic cores forms two air gaps, and the two Hall elements are arranged in the two air gaps respectively. Compared with the prior art, the utility model increases the measurement range of current and voltage, has a small volume, is simple to manufacture, has high reliability, and relatively reduces the production cost of the product.

Description

Technical Field

[0001] The utility model relates to the technical field of Hall current sensors, in particular to a dual Hall current sensor. Background Art

[0002] Hall effect sensors are widely used in industry, automobiles, computers, mobile phones and emerging consumer electronics. Hall effect current sensors are an important automatic detection component, which is popular because of its fast response speed, high measurement accuracy and wide measurement range. In order to make it suitable for a larger range of measurement processes, and considering the cost and popularity, it is necessary to design a sensor with a large range and relatively low production cost.

[0003] At present, there are three difficulties in the research and design of current sensors:

[0004] 1. Since high current sensors are usually large in size, heavy in weight, and complex in structure, it is very inconvenient to disassemble and transport them. If the test object is often in a working mode of intermittent conversion between low current and high current, then in order to complete the detection of currents of different ranges, two current sensors must be installed at the same time - a low current sensor and a high current sensor.

[0005] 2. Due to the characteristics of the installation environment, power safety principles and uninterrupted operation characteristics of the current sensor itself, its debugging, calibration and testing are only suitable for on-site implementation. Generally, in a large current environment, there is electromagnetic interference with large electromagnetic radiation and a wide spectrum range. A wide-range current sensor that can simultaneously measure small current and large current signals, how to resist the electromagnetic interference of the surrounding environment and improve the test accuracy when detecting weak current signals.

[0006] 3. Current includes steady-state current (such as direct current and alternating current), pulse current and transient large current. Therefore, an ideal current sensor should have the ability to detect the above three types of current at the same time. It can not only detect direct current but also transient current up to several hundred kHz. The amplitude of the measured current ranges from mA to 10,000 amperes, and the current test range and frequency band are very wide. Utility Model Content

[0007] The main purpose of the utility model is to provide a dual Hall current sensor, aiming to increase the current and voltage measurement range while relatively reducing the production cost of the product.

[0008] To achieve the above object, the utility model provides a dual Hall current sensor, comprising: a housing, two U-shaped open magnetic cores and two Hall elements arranged in the housing;

[0009] The openings of the two U-shaped open magnetic cores are arranged opposite to each other, the gap between the two U-shaped open magnetic cores forms two air gaps, and the two Hall elements are respectively arranged in the two air gaps.

[0010] A further technical solution of the utility model is that positioning blocks are arranged at the bottom of the two U-shaped open magnetic cores, and the two U-shaped open magnetic cores are arranged in the shell through the positioning blocks.

[0011] A further technical solution of the utility model is that the positioning block is arranged at the open end of the U-shaped open magnetic core, and the positioning block abuts against the inner side wall of the shell.

[0012] A further technical solution of the utility model is that a rectangular cavity is opened in the middle position of the shell, and the two U-shaped open magnetic cores are arranged around the outer wall of the rectangular cavity.

[0013] A further technical solution of the utility model is that an insulating plate and a circuit board are arranged in the shell, wherein the insulating plate is located between the two U-shaped open magnetic cores and the circuit board, and the two U-shaped open magnetic cores are bonded to the insulating plate to form a whole, and then connected to the circuit board.

[0014] A further technical solution of the utility model is that the two U-shaped open magnetic cores are welded to the circuit board through pins.

[0015] A further technical solution of the utility model is that a via is provided on the circuit board, and the dual Hall current sensor further comprises a wire, and the root of the wire is knotted, rotated 180° and then welded to the via.

[0016] A further technical solution of the utility model is that a filling layer is filled in the shell.

[0017] A further technical solution of the utility model is that the filling layer is an electronic glue potting sealing layer.

[0018] The beneficial effects of the dual Hall current sensor of the utility model are:

[0019] (1) The utility model provides two Hall elements connected to two U-shaped open magnetic cores, so that the measurable range of the dual Hall current sensor is expanded, thereby improving its scope of application. The two U-shaped open magnetic cores can relatively reduce the amount of magnetic cores used, thereby reducing the production cost and the weight of the dual Hall current sensor.

[0020] (2) Providing positioning blocks on the two U-shaped open magnetic cores can improve the accuracy and efficiency of assembling the two U-shaped open magnetic cores;

[0021] (3) The structure of the rectangular cavity and two U-shaped open magnetic cores can greatly reduce the interference of the surrounding electromagnetic field and improve the detection accuracy;

[0022] (4) A threading hole is set on the circuit board, and the root of the wire is knotted and rotated 180 degrees before being soldered to the via hole of the circuit board, which improves the reliability of the wire soldering point;

[0023] (5) Compared with a single Hall element, the dual Hall element greatly reduces the voltage offset and is not restricted by the shape and position of the conductor being measured. The same magnetic field strength can be obtained at any position of the two U-shaped open magnetic cores, thereby improving the performance of the dual Hall current sensor. However, the magnetic field strength of a single Hall element in the U-shaped magnetic core is unevenly distributed and is restricted by the position and shape of the conductor being measured.

[0024] (6) The utility model can convert the current signal of the conductor under test into a voltage signal through a high-precision resistor, allowing users to freely select current and voltage signals, and at the same time convert strong current signals into weak current signals, thereby improving safety of use and having a wider range of application scenarios and fields. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the exploded structure of a preferred embodiment of the dual Hall current sensor of the utility model;

[0026] Figure 2 It is a schematic diagram of the overall structure of a preferred embodiment of the dual Hall current sensor of the utility model.

[0027] Description of Figure Numbers:

[0028] Shell 1; U-shaped open magnetic core 2; Hall element 3; air gap 4; positioning block 5; rectangular cavity 6; insulating plate 7; circuit board 8; pin 9; wire 10. DETAILED DESCRIPTION

[0029] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0030] The utility model provides a dual-Hall current sensor, which can relatively reduce the production cost of the product while increasing the current and voltage measurement ranges thereof.

[0031] like Figure 1 and Figure 2 As shown, a preferred embodiment of the dual Hall current sensor of the utility model includes: a shell 1, two U-shaped open magnetic cores 2 and two Hall elements 3 arranged in the shell 1, and the shell 1 can support and protect the two U-shaped open magnetic cores 2 and the two Hall elements 3.

[0032] The housing 1 is provided with two wiring terminals, and the two Hall elements 3 are electrically connected to the two wiring terminals respectively.

[0033] The openings of the two U-shaped open magnetic cores 2 are arranged opposite to each other, and the gap between the two U-shaped open magnetic cores 2 forms two air gaps 4 . The two Hall elements 3 are respectively arranged in the two air gaps 4 .

[0034] In this embodiment, two Hall elements 3 are respectively arranged in two air gaps 4 between two U-shaped open magnetic cores 2 to increase the measuring range, so that the measuring range can be applied to the measuring circuit of a larger current.

[0035] In addition, the present embodiment uses two U-shaped open cores 2, which can reduce the volume compared to a circular or square core of the same size. Therefore, the core material is relatively small, the weight is reduced, and the production cost is relatively reduced.

[0036] At the same time, compared with the single Hall element 3, the dual Hall element 3 greatly reduces the voltage offset and is not restricted by the shape and position of the current-carrying conductor being measured. The same magnetic field strength can be obtained at any position of the U-shaped open magnetic core 2, thereby improving the performance of the dual Hall current sensor. However, the magnetic field strength distribution of the single Hall element 3 in the U-shaped magnetic core is uneven and is constrained by the position and shape of the conductor being measured.

[0037] The dual Hall current sensor of this embodiment can be used as a key component of a contactless sensor for detecting linear position, rotation angle, speed, current, etc., and can be widely used in industrial control, consumer electronics, automotive industry and other fields.

[0038] Furthermore, in this embodiment, positioning blocks 5 are provided at the bottom of the two U-shaped open magnetic cores 2 , and the two U-shaped open magnetic cores 2 are arranged in the housing 1 through the positioning blocks 5 .

[0039] Specifically, in this embodiment, the positioning block 5 is disposed at the open end of the U-shaped open magnetic core 2 , and the positioning block 5 abuts against the inner wall of the housing 1 .

[0040] During the process of placing the two U-shaped open magnetic cores 2 in the shell 1 for assembly, the positioning block 5 can directly abut the inner wall of the shell, and there is no need to manually grasp the specific fixed position of the two U-shaped open magnetic cores 2. The positioning block 5 can be used to position the two U-shaped open magnetic cores 2 in the shell 1, which can not only ensure the installation accuracy but also improve the installation efficiency.

[0041] Furthermore, in this embodiment, a rectangular cavity 6 is opened in the middle of the shell 1 , and two U-shaped open magnetic cores 2 are arranged around the outer wall of the rectangular cavity 6 .

[0042] The rectangular cavity 6 can be used as a measuring hole for placing a current-carrying conductor. The rectangular cavity 6 and the two U-shaped open magnetic cores 2 can greatly reduce the interference of the surrounding electromagnetic field and improve the detection accuracy.

[0043] Furthermore, in this embodiment, an insulating plate 7 and a circuit board 8 are provided in the shell 1, wherein the insulating plate 7 is located between the two U-shaped open magnetic cores 2 and the circuit board 8, and the two U-shaped open magnetic cores 2 are bonded to the insulating plate 7 to form a whole, and then connected to the circuit board 8.

[0044] The two U-shaped open magnetic cores 2 are welded to the circuit board 8 via pins 9 .

[0045] In this embodiment, the two U-shaped open magnetic cores 2 are bonded to the insulating plate 7 to form a whole, and then installed on the circuit board 8. The two U-shaped open magnetic cores 2 are welded to the circuit board 8 through the pins 9. The insulating plate 7 is arranged between the circuit board 8 and the two U-shaped open magnetic cores 2, so that the devices on the circuit board 8 are insulated and isolated from the two U-shaped open magnetic cores 2, and at the same time, they are not affected by the magnetic field strength.

[0046] Furthermore, in this embodiment, a via is provided on the circuit board 8, and the dual Hall current sensor further includes a wire 10, the root of the wire 10 is knotted and rotated 180 degrees and then welded into the via.

[0047] In this embodiment, the wire 10 is knotted at the root, rotated 180° and then welded to the via hole, so that when the wire 10 is subjected to external tension, the point of action is at the knotted position of the wire 10 rather than at the soldering point of the wire 10, thereby improving the connection strength between the wire 10 and the circuit board 8, making the joint of the wire 10 less likely to be damaged and disconnected, thereby improving the service life of the dual Hall current sensor.

[0048] Furthermore, in this embodiment, the housing is filled with a filling layer, wherein the filling layer is an electronic potting sealing layer.

[0049] In this embodiment, the filling layer is arranged in the idle space inside the shell, so as to support and protect the internal components of the shell. When a collision occurs, it can provide buffering and shock absorption, and it is not easy to damage the internal components, thereby further improving the service life of the dual Hall current sensor.

[0050] The beneficial effects of the dual Hall current sensor of the utility model are:

[0051] (1) The utility model provides two Hall elements connected to two U-shaped open magnetic cores, so that the measurable range of the dual Hall current sensor is expanded, thereby improving its scope of application. The two U-shaped open magnetic cores can relatively reduce the amount of magnetic cores used, thereby reducing the production cost and the weight of the dual Hall current sensor.

[0052] (2) Providing positioning blocks on the two U-shaped open magnetic cores can improve the accuracy and efficiency of assembling the two U-shaped open magnetic cores;

[0053] (3) The structure of the rectangular cavity and two U-shaped open magnetic cores can greatly reduce the interference of the surrounding electromagnetic field and improve the detection accuracy;

[0054] (4) A threading hole is set on the circuit board, and the root of the wire is knotted and rotated 180 degrees before being soldered to the via hole of the circuit board, which improves the reliability of the wire soldering point;

[0055] (5) Compared with a single Hall element, the dual Hall element greatly reduces the voltage offset and is not restricted by the shape and position of the conductor being measured. The same magnetic field strength can be obtained at any position of the two U-shaped open magnetic cores, thereby improving the performance of the dual Hall current sensor. However, the magnetic field strength of a single Hall element in the U-shaped magnetic core is unevenly distributed and is restricted by the position and shape of the conductor being measured.

[0056] (6) The utility model can convert the current signal of the conductor under test into a voltage signal through a high-precision resistor, allowing users to freely select current and voltage signals, and at the same time convert strong current signals into weak current signals, thereby improving safety of use and having a wider range of application scenarios and fields.

[0057] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A dual Hall current sensor, characterized in that: include: A shell, two U-shaped open magnetic cores and two Hall elements arranged in the shell; The openings of the two U-shaped open magnetic cores are arranged opposite to each other, the gap between the two U-shaped open magnetic cores forms two air gaps, and the two Hall elements are respectively arranged in the two air gaps.

2. The dual Hall current sensor according to claim 1, characterized in that: Positioning blocks are arranged at the bottom of the two U-shaped open magnetic cores, and the two U-shaped open magnetic cores are arranged in the shell through the positioning blocks.

3. The dual Hall current sensor according to claim 2, characterized in that: The positioning block is arranged at the opening end of the U-shaped open magnetic core, and the positioning block abuts against the inner side wall of the shell.

4. The dual Hall current sensor according to claim 3, characterized in that: A rectangular cavity is opened in the middle of the shell, and the two U-shaped open magnetic cores are arranged around the outer wall of the rectangular cavity.

5. The dual Hall current sensor according to claim 4, characterized in that: An insulating plate and a circuit board are arranged in the shell, wherein the insulating plate is located between the two U-shaped open magnetic cores and the circuit board, and the two U-shaped open magnetic cores are bonded to the insulating plate to form a whole, and then connected to the circuit board.

6. The dual Hall current sensor according to claim 5, characterized in that: The two U-shaped open magnetic cores are welded to the circuit board through pins.

7. The dual Hall current sensor according to claim 6, characterized in that: The circuit board is provided with a via hole, and the dual Hall current sensor also includes a wire, and the root of the wire is knotted, rotated 180 degrees, and then welded to the via hole.

8. The dual Hall current sensor according to claim 7, characterized in that: The shell is filled with a filling layer.

9. The dual Hall current sensor according to claim 8, characterized in that: The filling layer is an electronic potting sealing layer.

Images