Single-hole current sensor

Abstract

The single-hole current sensor comprises a shell and a chip, an installation groove is formed in the position, close to the middle, of the top of the shell, a plurality of reinforcing ribs are symmetrically installed on the side wall of the installation groove, and the chip extends in the depth direction of the installation groove and is inserted between the reinforcing ribs in an interference fit mode; the single-hole current sensor further comprises an adhesive layer, the adhesive layer is arranged to be poured into the installation groove after the chip is installed in place and completely covers the reinforcing ribs, and pins of the chip are located on the outer side of the adhesive layer and used for being connected with a PCBA board. According to the single-hole current sensor provided by the invention, the chip is fixed through the plurality of reinforcing ribs of the shell and then is further fixed through the adhesive layer, parts such as a bushing, a PCBA board and a cover are omitted, the structure is simple, the assembly is convenient, automatic production can be realized, the production efficiency is greatly improved, and the product rejection rate is relatively low.

Description

Technical Field

[0001] The utility model relates to the technical field of sensor products, in particular to a single-hole current sensor. Background Art

[0002] The main function of the drive motor is to provide power for new energy vehicles and convert electrical energy into rotational mechanical energy. The role of the motor controller assembly is to control the working state of the motor in real time based on the hardware and software design of power semiconductors, so that it can work in the required direction, speed, torque, and response time. The real-time control of the working state of the motor is inseparable from the real-time data of the current, which requires current sensors to sample to achieve closed-loop control.

[0003] At present, the current sensor used in electric drive is a three-in-one module, which consists of a sensor housing, three cores, three chips, a PCBA board, five terminals and a cover. The three cores and the housing are injection molded into one part, and three chips are welded on the PCBA board, which are inserted into the openings of the corresponding cores. The terminal adopts a fisheye design, one end of which is fixed to the PCBA board by crimping, and the other end is crimped and fixed to the PCBA board on the IGBT. At the same time, there are five bushings on the housing, which are fixed to the IBGT and the copper busbar respectively. This module has many parts and high cost, and the production process is complicated and the scrap rate is also high. Utility Model Content

[0004] One advantage of the utility model is that it provides a single-hole current sensor, in which the shell fixes the chip by means of a plurality of reinforcing ribs provided therewith, and then further fixes it by means of an adhesive layer, thereby eliminating components such as a bushing, a PCBA board and a cover, and has a simple structure, is easy to assemble, and can realize automated production, thereby greatly improving production efficiency, and at the same time, the product scrap rate is low.

[0005] One advantage of the utility model is that it provides a single-hole current sensor, in which guide reinforcement ribs and limit reinforcement ribs are arranged in the shell at the same time, so that the chip can be accurately inserted into place, wherein the top of the limit reinforcement rib is triangular, which can reduce the resistance when the chip is inserted, thereby ensuring that the chip is quickly and accurately inserted into place.

[0006] One advantage of the utility model is that it provides a single-hole current sensor, in which the terminal can be directly welded to the PCBA board, eliminating the original bolt fixation, which can not only save costs but also further improve production efficiency.

[0007] In order to achieve at least one of the above advantages of the utility model, the utility model provides a single-hole current sensor, including a shell and a chip, wherein the shell is provided with a mounting groove near the middle of the top, and the side wall of the mounting groove is symmetrically provided with a plurality of reinforcing ribs, and the chip extends along the depth direction of the mounting groove and is inserted between the plurality of reinforcing ribs in an interference fit manner;

[0008] The single-hole current sensor also includes a glue layer, which is configured to be poured into the installation groove after the chip is installed in place and completely cover the reinforcing rib, wherein the pins of the chip are located on the outside of the glue layer for connecting to the PCBA board.

[0009] According to one embodiment of the utility model, the mounting groove is a square groove, and the reinforcing ribs include two symmetrically distributed guide reinforcing ribs and an even number of symmetrically distributed limiting reinforcing ribs, wherein the guide reinforcing ribs are located at both ends of the mounting groove in the length direction and are gap-matched with the chip, and the limiting reinforcing ribs are located on both sides of the mounting groove in the length direction and are interference-matched with the chip.

[0010] According to an embodiment of the utility model, the limiting reinforcement ribs are implemented as four, and the two limiting reinforcement ribs on any side are evenly distributed in the length direction of the installation groove.

[0011] According to an embodiment of the utility model, the top end of the limiting reinforcement rib has a triangular cross-section in the horizontal direction, and the sharp corner of the triangle is located in the middle position facing the chip, wherein the horizontal direction is perpendicular to the depth direction of the mounting groove.

[0012] According to an embodiment of the utility model, an iron core and a terminal are provided in the housing by means of integral injection molding.

[0013] According to an embodiment of the utility model, the terminals are U-shaped and symmetrically distributed at both ends of the shell in the length direction, and the two antennae of the terminals protrude vertically from the shell for connecting the PCBA board.

[0014] These and other purposes, features and advantages of the present invention are fully reflected in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram of the three-dimensional structure of a single-hole current sensor according to a preferred embodiment of the present application is shown.

[0016] Figure 2 A partial top view structural schematic diagram of a single-hole current sensor according to a preferred embodiment of the present application is shown.

[0017] Figure 3A partial structural schematic diagram of a single-hole current sensor according to a preferred embodiment of the present application is shown. DETAILED DESCRIPTION

[0018] The following description is used to disclose the utility model so that those skilled in the art can implement the utility model. The preferred embodiments described below are only examples, and those skilled in the art can think of other obvious variations. The basic principles of the utility model defined in the following description can be applied to other embodiments, variations, improvements, equivalents, and other technical solutions that do not deviate from the spirit and scope of the utility model.

[0019] Those skilled in the art should understand that, in the disclosure of the specification, the orientation or position relationship indicated by the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. are based on the orientation or position relationship shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

[0020] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0021] refer to Figures 1 to 3A single-hole current sensor according to a preferred embodiment of the utility model will be described in detail below, wherein the single-hole current sensor includes a shell 10 and a chip 20, wherein the shell 10 is a plastic shell, and an iron core 11 and a terminal 12 are arranged in the shell 10 in an integral injection molding manner, thereby reducing the number of parts, simplifying the production and assembly process, and reducing the loss rate, wherein the shell 10 is provided with a mounting groove 101 near the middle of the top, and the side wall of the mounting groove 101 is symmetrically provided with a plurality of reinforcing ribs 13, and the chip 20 extends along the depth direction of the mounting groove 101, and is formed by passing through the mounting groove 101. It is inserted between the multiple reinforcing ribs 13 in an interference fit manner. In addition, the single-hole current sensor also includes a glue layer 30, wherein the glue layer 30 is configured to be poured into the installation groove 101 after the chip 20 is installed in place, and completely covers the reinforcing rib 13 to ensure that the chip 20 and the pins of the chip 20 are always maintained in a vertically extended state, thereby eliminating the additional plastic parts for maintaining the position of the pins of the chip 20, wherein the pins of the chip 20 are located on the outside of the glue layer 30, for connecting to the PCBA board, such as directly welding to the PCBA board on the customer side, saving costs and facilitating customer installation.

[0022] That is to say, in the single-hole current sensor provided in the present application, the shell 10 fixes the chip 20 by means of its own reinforcing ribs 13 and the adhesive layer 30, which can ensure that the chip 20 and the pins of the chip 20 always remain in a vertically extended state, so as to facilitate the connection to the PCBA board on the customer side, thereby eliminating the additional plastic parts for maintaining the pin posture of the chip 20, saving costs and simplifying the process. In addition, the PCBA board is eliminated, and the iron core 11 and the terminal 12 are both arranged in the shell 10 in an integral injection molding manner, which effectively reduces the total number of components and facilitates production and assembly.

[0023] In one embodiment, the mounting groove 101 is a square groove. The reinforcing ribs 13 include two symmetrically distributed guiding reinforcing ribs 131 and an even number of symmetrically distributed limiting reinforcing ribs 132, wherein the guiding reinforcing ribs 131 are located at both ends of the length direction of the mounting groove 101 and are clearance-matched with the chip 20 to play a guiding role when inserting the chip 20, wherein the limiting reinforcing ribs 132 are located at both sides of the length direction of the mounting groove 101 and are interference-matched with the chip 20 to play a limiting role when inserting the chip 20, thereby ensuring that the chip 20 can be accurately inserted into place and maintained in a vertically extended posture.

[0024] Further preferably, the limiting reinforcement ribs 132 are implemented as four, and the two limiting reinforcement ribs 132 on any side are evenly distributed in the length direction of the installation groove 101, so as to maintain a uniform limiting resistance.

[0025] Further preferably, the top end of the limiting reinforcement rib 132 has a triangular cross-section in the horizontal direction, and the sharp corner of the triangle is located in the middle position opposite to the chip 20, wherein the horizontal direction is the vertical direction of the depth direction of the mounting groove 101. In this way, the resistance to the chip 20 can be reduced to a certain extent through the triangular design on the basis of multi-point synchronous limiting. At the same time, the limiting effect is not greatly reduced, thereby ensuring that the chip 20 is quickly and accurately inserted into place, which can improve production efficiency.

[0026] In one embodiment, the terminal 12 is U-shaped and symmetrically distributed at both ends of the shell 10 in the length direction, and the two antennae 121 of the terminal 12 protrude vertically from the shell, and are used to connect the PCBA board, such as connecting the PCBA board on the customer side by welding, thereby eliminating conventional fixing bolts, reducing parts and reducing costs.

[0027] It should be understood by those skilled in the art that the embodiments of the present invention described above and shown in the accompanying drawings are only examples and do not limit the present invention. The advantages of the present invention have been fully and effectively realized. The functions and structural principles of the present invention have been demonstrated and explained in the embodiments, and the embodiments of the present invention may be deformed or modified in any way without departing from the principles.

Claims

1. A single-hole current sensor, comprising a housing and a chip, characterized in that: The housing is provided with a mounting groove near the middle of the top, and a plurality of reinforcing ribs are symmetrically installed on the side wall of the mounting groove. The chip extends along the depth direction of the mounting groove and is inserted between the plurality of reinforcing ribs in an interference fit manner. The single-hole current sensor also includes a glue layer, which is configured to be poured into the installation groove after the chip is installed in place and completely cover the reinforcing rib, wherein the pins of the chip are located on the outside of the glue layer for connecting to the PCBA board.

2. The single-hole current sensor according to claim 1, characterized in that: The mounting groove is a square groove, and the reinforcing ribs include two symmetrically distributed guide reinforcing ribs and an even number of symmetrically distributed limiting reinforcing ribs, wherein the guide reinforcing ribs are located at both ends of the length direction of the mounting groove and are gap-matched with the chip, wherein the limiting reinforcing ribs are located on both sides of the length direction of the mounting groove and are interference-matched with the chip.

3. The single-hole current sensor according to claim 2, characterized in that: The number of the limiting reinforcement ribs is four, and the two limiting reinforcement ribs on any one side are evenly distributed in the length direction of the installation groove.

4. The single-hole current sensor according to claim 3, characterized in that: The cross-section of the top end of the limiting reinforcement rib in the horizontal direction is triangular, and the sharp corner of the triangle is located in the middle position facing the chip, wherein the horizontal direction is the vertical direction of the depth direction of the mounting groove.

5. The single-hole current sensor according to claim 1, characterized in that: An iron core and a terminal are arranged in the shell in an integral injection molding manner.

6. The single-hole current sensor according to claim 5, characterized in that: The terminals are U-shaped and symmetrically distributed at both ends of the shell in the length direction, and two antennae of the terminals protrude vertically from the shell for connecting to the PCBA board.

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