A coreless current sensor

Abstract

The utility model relates to a coreless current sensor relates to current sensor technical field for the prior art coreless current sensor shell cannot be dismantled, internal element maintenance replacement difficult problem. Coreless current sensor includes plastic shell, PCB board, pin and positioning column, the cavity of accommodating is formed in the plastic shell, and the plastic shell forms the mounting hole of through the side wall board of one side of plastic shell, the PCB board sets up in the plastic shell, the one end of pin is welded on the PCB board, and the other end of pin is through mounting hole and extends to the outside of plastic shell, positioning column sets up two, two positioning columns interval distribution, two positioning columns with mounting hole are located on the same side side wall of plastic shell, and two positioning columns are located opposite two sides of pin respectively, wherein, the plastic shell includes first part and second part, and the connecting place of first part and second part forms annular clamping protrusion and clamping recess, and clamping protrusion extends into clamping recess to form the plastic shell.

Description

Technical Field

[0001] This application relates to the field of current sensor technology, and more particularly to a coreless current sensor. Background Technology

[0002] Coreless current sensors are widely used in power electronics, new energy and other fields due to their advantages such as no hysteresis and fast response speed.

[0003] Currently, most existing coreless current sensors have a one-piece housing structure. When internal components are damaged and need repair or replacement, it is difficult to disassemble the housing. Often, the housing needs to be broken to operate, which not only makes repair difficult but also wastes resources. Utility Model Content

[0004] This application provides a coreless current sensor to address the problem in the prior art where the housing of a coreless current sensor is not removable and the internal components are difficult to repair or replace.

[0005] This application provides a coreless current sensor, including a plastic housing, a PCB board, a pin, and positioning posts. A receiving cavity is formed inside the plastic housing, and a mounting hole penetrating one side wall of the plastic housing is formed on one side of the plastic housing. The PCB board is disposed inside the plastic housing. One end of the pin is soldered to the PCB board, and the other end of the pin passes through the mounting hole and extends outside the plastic housing. Two positioning posts are provided, spaced apart, with the two positioning posts and the mounting hole located on the same side wall of the plastic housing, and the two positioning posts located on opposite sides of the pin. The plastic housing includes a first part and a second part, with an annular snap-fit ​​protrusion and a snap-fit ​​recess formed at the connection between the first part and the second part. The snap-fit ​​protrusion extends into the snap-fit ​​recess to form the plastic housing, and the connection between the first part and the second part is welded and fixed.

[0006] In some embodiments of this application, the positioning post and mounting hole are located on the first part, and the PCB board is mounted in the second part.

[0007] In some embodiments of this application, six pins are provided, distributed in an array; each pin corresponds to an independent mounting hole.

[0008] In some embodiments of this application, a mounting groove is provided in the first part, and the PCB board is disposed in the mounting groove and fixedly connected to the first part by bolts.

[0009] In some embodiments of this application, the plastic housing is encapsulated with adhesive.

[0010] In some embodiments of this application, a foolproof protrusion is provided on the side of the second portion away from the first portion.

[0011] In some embodiments of this application, a clearance groove is provided on the side of the second part away from the first part, and the clearance groove is located on the side of the anti-foolproof protrusion.

[0012] Compared with the prior art, the technology provided in this application has the following advantages:

[0013] By setting the plastic housing as a detachable first part and second part, which are fixed together by snap-fit ​​protrusions and snap-fit ​​recesses and welded together, the welded joints can be removed when internal components need to be repaired or replaced, thus disassembling the housing. This facilitates operation of the internal components, reduces resource waste, and lowers the cost of use. Attached Figure Description

[0014] The accompanying drawings are provided to further illustrate the technical solution of this utility model and constitute a part of the specification. They are used together with the embodiments of this application to explain the technical solution of this utility model and do not constitute a limitation on the technical solution of this utility model.

[0015] Figure 1 This is a schematic diagram of a coreless current sensor provided in an embodiment of this application.

[0016] Figure 2 This is a front view of a coreless current sensor provided in an embodiment of this application.

[0017] Reference numerals: 1-Plastic housing; 11-First part; 12-Second part; 13-Anti-foolproof protrusion; 14-Allowing groove; 15-Mounting hole; 2-Pin; 3-Positioning post. Detailed Implementation

[0018] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0019] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0020] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0021] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "connected" and "linked" should be interpreted broadly, for example, as a fixed connection, a detachable connection, or an integral connection. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances. Furthermore, when describing pipelines, the terms "connected" and "linked" as used in this application have the meaning of establishing electrical connection. The specific meaning needs to be understood in conjunction with the context.

[0022] In the embodiments of this application, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design that is described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design. Specifically, the use of the terms "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0023] A coreless current sensor, please refer to Figure 1 It includes a plastic housing 1, a PCB board, pins 2, positioning posts 3, and a foolproof protrusion 13.

[0024] Please refer to Figure 1 The plastic housing 1 is made of engineering plastics such as PBT (polybutylene terephthalate) or LCP (liquid crystal polymer), which has good insulation, heat resistance, and mechanical strength, meeting the sensor's usage requirements in different environments. It is generally rectangular in shape, with an internal cavity to house components such as the PCB board. Both the first part 11 and the second part 12 are box-shaped structures with one open end, their open ends fitting together to provide installation space and protection for the internal components, preventing external dust and moisture from affecting them, while also providing insulation to ensure safe sensor operation. The first part 11 and the second part 12 are connected by annular snap-fit ​​protrusions and recesses. The snap-fit ​​protrusions extend into the snap-fit ​​recesses for initial positioning and fixation, and then are welded together at the connection point to ensure reliable connection. When repairing or replacing internal components, the welded joints can be removed for separation.

[0025] The PCB board uses a fiberglass cloth substrate, which has good insulation properties and mechanical strength, and can support various electronic components. Its shape is rectangular according to the design of the cavity of the plastic housing 1, and its dimensions are adapted to the mounting slot or the interior of the second part 12. As the core component of the sensor, it integrates circuit elements for current detection, enabling current sensing and signal processing. When the PCB board is installed in the second part 12, it is initially fixed by clips or glue; when the mounting slot is provided in the first part 11, the PCB board is placed in the mounting slot and fixedly connected to the first part 11 by bolts. The bolt connection method facilitates its disassembly and replacement.

[0026] Please refer to Figure 1 The pin 2 is made of brass with a tin-plated surface to improve conductivity and oxidation resistance. It is cylindrical, with one end serving as a soldering end for soldering to the PCB board and the other end as a connection end for connecting to external devices. This enables signal transmission between the PCB board and external devices, transmitting the current signal detected by the sensor to the external device. One end of the pin 2 is soldered to the PCB board to ensure a good electrical connection; the other end passes through the mounting hole 15 and extends outside the plastic housing 1. The mounting hole 15 positions and fixes the pin 2, preventing it from shaking.

[0027] Please refer to Figure 1 The positioning post 3 is made of the same material as the plastic housing 1, using engineering plastics such as PBT or LCP. It is cylindrical and its height is slightly higher than the side wall of the plastic housing 1. It plays a positioning role during sensor installation, ensuring that the sensor is accurately installed in the preset position, thus improving installation accuracy and efficiency. The two positioning posts 3 are spaced apart on the same side wall of the plastic housing 1, located on opposite sides of the pin 2, and are integrally formed with the plastic housing 1.

[0028] Please refer to Figure 1 and Figure 2 The anti-mistake protrusion 13 is made of the same material as the plastic shell 1, and its shape can be designed as an irregular shape such as a triangle or a rectangle. It can prevent the sensor from being installed in the wrong direction and ensure the correctness of the installation. It is located on the side of the second part 12 away from the first part 11 and is integrally formed with the second part 12.

[0029] Please refer to Figure 1 and Figure 2 The clearance groove 14 is made of the same material as the plastic housing 1 and is a rectangular groove. Its size is designed according to the obstacles in the installation environment. When the sensor is installed, it can provide clearance space for protrusions or other structures on the external device to avoid interference during installation. It is located on one side of the anti-fooling protrusion 13 and is integrally formed with the second part 12.

[0030] The adhesive is made of epoxy resin, which has good sealing, insulation and bonding strength. It fixes and protects the components inside the plastic housing 1, prevents the components from shaking during use, and enhances the sealing of the housing to prevent dust, moisture and other substances from entering. It is encapsulated in the plastic housing 1 and fills the gap between the PCB board and the plastic housing 1.

[0031] Please refer to Figure 1 This application provides an embodiment of a coreless current sensor, comprising a plastic housing 1, a PCB board, pins 2, and positioning posts 3. The plastic housing 1 is made of PBT material and includes a first part 11 and a second part 12, both of which are rectangular box-shaped structures with one open end. An annular snap-fit ​​protrusion and a snap-fit ​​recess are formed at the connection between the first part 11 and the second part 12, with the snap-fit ​​protrusion extending into the snap-fit ​​recess. The connection is fixed by ultrasonic welding.

[0032] Positioning posts 3 and mounting holes 15 are located on the first part 11. Two positioning posts 3 are spaced apart on the side wall of the first part 11, located on opposite sides of the pins 2. The positioning posts 3 are integrally formed with the first part 11. There are 6 pins 2, made of tin-plated brass, cylindrical in shape, and arranged in an array. Each pin 2 has an independent mounting hole 15. One end of the pin 2 is soldered to the PCB board, and the other end passes through the mounting hole 15 and extends to the outside of the plastic housing 1.

[0033] The PCB board uses a fiberglass cloth substrate and is installed inside the second part 12, initially fixed by clips. A square anti-misalignment protrusion 13 is provided on the side of the second part 12 away from the first part 11, and a rectangular clearance groove 14 is provided on one side of the anti-misalignment protrusion 13. Both the anti-misalignment protrusion 13 and the clearance groove 14 are integrally formed with the second part 12. Epoxy resin adhesive is encapsulated inside the plastic housing 1.

[0034] This application provides a second embodiment of a coreless current sensor, comprising a plastic housing 1, a PCB board, pins 2, and positioning posts 3. The plastic housing 1 is made of LCP material and includes a first part 11 and a second part 12. The connection between the first part 11 and the second part 12 has an annular snap-fit ​​protrusion and a snap-fit ​​recess, with the snap-fit ​​protrusion extending into the snap-fit ​​recess. The connection is fixed by laser welding.

[0035] The first part 11 has a mounting slot. The PCB board is made of fiberglass cloth substrate, which is placed in the mounting slot and fixedly connected to the first part 11 by bolts. There are 6 pins 2 arranged in an array. Each pin 2 has an independent mounting hole 15. One end of the pin 2 is soldered to the PCB board, and the other end passes through the mounting hole 15 and extends to the outside of the plastic shell 1.

[0036] Two positioning posts 3 are spaced apart on the side wall of the first part 11 and are integrally formed with the first part 11. A rectangular anti-foolproof protrusion 13 is provided on the side of the second part 12 away from the first part 11, and a rectangular clearance groove 14 is provided on one side of the anti-foolproof protrusion 13. Epoxy resin adhesive is encapsulated inside the plastic shell 1.

[0037] In the description of this specification, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0038] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A coreless current sensor, characterized in that, include: A plastic housing with an internal cavity, and a mounting hole through a side wall panel of the plastic housing is formed on one side of the plastic housing. The PCB board is housed within the plastic casing; The pin has one end soldered to the PCB board, and the other end of the pin passes through the mounting hole and extends to the outside of the plastic housing; The positioning posts are provided in two, and the two positioning posts are distributed at intervals. The two positioning posts and the mounting holes are located on the same side wall of the plastic housing, and the two positioning posts are respectively located on opposite sides of the pin. The plastic shell includes a first part and a second part. An annular snap-fit ​​protrusion and a snap-fit ​​recess are formed at the connection between the first part and the second part. The snap-fit ​​protrusion extends into the snap-fit ​​recess to form the plastic shell. The connection between the first part and the second part is welded and fixed.

2. The coreless current sensor according to claim 1, characterized in that, The positioning post and the mounting hole are located on the first part, and the PCB board is mounted in the second part.

3. The coreless current sensor according to claim 2, characterized in that, The pins are configured to be 6 in number, and the 6 pins are arranged in an array. Each of the aforementioned pins corresponds to a separate mounting hole.

4. The coreless current sensor according to claim 1, characterized in that, The first part is provided with a mounting groove, and the PCB board is disposed in the mounting groove and fixedly connected to the first part by bolts.

5. The coreless current sensor according to claim 1, characterized in that, The plastic shell is encapsulated with glue.

6. The coreless current sensor according to any one of claims 1 to 5, characterized in that, The second part has a foolproof protrusion on the side away from the first part.

7. The coreless current sensor according to claim 6, characterized in that, A clearance groove is provided on the side of the first part away from the second part, and the clearance groove is located on the side of the anti-foolproof protrusion.

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