Self-positioning assembly type current sensor

Abstract

The utility model relates to a self-positioning assembly type current sensor. A magnetic core is of an annular structure provided with an open air gap; and the PINs are arranged at the upper end of the PCB and are connected with the PCB. The shell is of a cavity structure with an open upper part; a first positioning column and a first buckle structure are arranged in the shell; the magnetic core is arranged on the first positioning column in a sleeving mode, and the PCB is clamped and fixed to the first buckle structure. The outer edge of the PCB is provided with a substrate extending outwards, the substrate is arranged in the opening air gap of the magnetic core, and the TMR chip is installed on the substrate; and the copper wire passes through the shell and is connected with the PCB. According to the self-positioning assembly type current sensor, the magnetic core sleeves the first positioning column, the magnetic core can be positioned through the first positioning column, the PCB is clamped and fixed on the first buckle structure, and the position of the PCB can be fixed through the first buckle structure, so that displacement of the magnetic core and the PCB in a subsequent glue injection process can be prevented, and the reliability of the current sensor is improved. And the yield of the current sensor is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of current sensors, in particular to a self-positioning assembled current sensor. Background Art

[0002] The current sensor has complicated installation steps and assembly problems in the product manufacturing process. Due to the small size of the sensor product and the large number of components, the installation and positioning of most structural parts are difficult. For example, the magnetic core of some existing TCTK current sensors needs to be positioned by the PCB circuit board. After the magnetic core and the PCB circuit board are connected, they are placed in the shell and then fixed by glue injection. This positioning method easily leads to positioning deviations of multiple components, affecting the yield rate of the current sensor. Utility Model Content

[0003] The utility model provides a self-positioning assembled current sensor to solve the technical problem that the magnetic core of a TCTK current sensor in the prior art needs to be positioned by a PCB circuit board, which easily leads to positioning deviations of multiple devices.

[0004] The technical solution of the utility model to solve the above technical problems is as follows:

[0005] A self-positioning assembled current sensor, comprising: a copper wire, a housing, a PCB circuit board, a TMR chip, a PIN needle and a magnetic core;

[0006] The magnetic core is an annular structure provided with an open air gap;

[0007] The PIN needle is arranged at the upper end of the PCB circuit board and connected to the PCB circuit board;

[0008] The housing is configured as a chamber structure with an open top; a first positioning column and a first buckle structure are provided inside the housing; the magnetic core is sleeved on the first positioning column, and the PCB circuit board is fixedly connected to the first buckle structure;

[0009] The outer edge of the PCB circuit board is provided with a substrate extending outward, the substrate is arranged in the open air gap of the magnetic core, and the TMR chip is mounted on the substrate; the copper wire passes through the housing and is connected to the PCB circuit board.

[0010] Further: also include: a second positioning column;

[0011] The second positioning column is arranged inside the housing;

[0012] The second positioning column cooperates with the arc surface on the side of the PCB circuit board to assist in positioning the PCB circuit board.

[0013] Furthermore: the copper wire passes through the inner sides of the first positioning column and the second positioning column.

[0014] Further: also includes: a second buckle structure;

[0015] The second buckle structure is fixed on the outer side of the shell, and the copper wire is buckled on the second buckle structure.

[0016] Furthermore: a plurality of feet with the same height are arranged at the bottom of the inner side of the shell, and the PCB circuit board is placed on the feet.

[0017] The self-positioning assembled current sensor provided by the utility model has at least the following beneficial effects or advantages:

[0018] The utility model provides a self-positioning assembled current sensor, wherein the magnetic core is an annular structure provided with an open air gap. The PIN pin is arranged at the upper end of the PCB circuit board and connected to the PCB circuit board. The outer shell is arranged as a chamber structure with an open upper portion; a first positioning column and a first snap-fit ​​structure are arranged inside the outer shell; the magnetic core is sleeved on the first positioning column, and the PCB circuit board is snap-fitted and fixed on the first snap-fit ​​structure. The outer edge of the PCB circuit board is provided with a substrate extending outward, the substrate is arranged in the air gap of the magnetic core, and the TMR chip is mounted on the substrate; the copper wire passes through the outer shell and is connected to the PCB circuit board. In the self-positioning assembled current sensor, the magnetic core is sleeved on the first positioning column, the magnetic core can be positioned by the first positioning column, the PCB circuit board is snap-fitted and fixed on the first snap-fit ​​structure, and the PCB circuit board can be fixed in position by the first snap-fit ​​structure, thereby preventing the magnetic core and the PCB circuit board from being displaced in the subsequent glue injection process, thereby improving the yield rate of this type of current sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of the external structure of a self-positioning assembled current sensor provided by an embodiment of the utility model;

[0020] Figure 2 A schematic diagram of the housing structure provided by an embodiment of the utility model;

[0021] Figure 3 A schematic diagram of another housing structure provided by an embodiment of the utility model;

[0022] Figure 4 A schematic diagram of the explosion structure of a self-positioning assembled current sensor provided by an embodiment of the utility model;

[0023] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0024] 1-housing, 2-PCB circuit board, 21-substrate, 3-first positioning column, 4-second positioning column, 5-copper wire, 6-magnetic core, 7-TMR chip, 8-PIN needle, 9-foot, 10-second buckle structure, 11-first buckle structure. DETAILED DESCRIPTION

[0025] The utility model provides a self-positioning assembled current sensor to solve the technical problem that the magnetic core of a TCTK current sensor in the prior art needs to be positioned by a PCB circuit board, which easily leads to positioning deviations of multiple devices.

[0026] 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 of 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.

[0027] like Figure 2-Figure 4 As shown: The embodiment of the utility model provides a self-positioning assembled current sensor, including: copper wire 5, shell 1, PCB circuit board 2, TMR chip 7, PIN needle 8 and magnetic core 6. The magnetic core 6 is a ring structure with an open air gap. The PIN needle 8 is arranged at the upper end of the PCB circuit board 2 and connected to the PCB circuit board 2. The shell 1 is arranged as a chamber structure with an open upper portion, and a first positioning column 3 and a first buckle structure 11 are arranged inside the shell 1. The first positioning column 3 is arranged as a structure that matches the inner cavity of the magnetic core 6, and the first buckle structure 11 is arranged as a structure that matches the PCB circuit board 2; in a specific application, the first positioning column 3 and the second buckle structure 10 are integrally processed with the shell 1. The magnetic core 6 is sleeved on the first positioning column 3, and the magnetic core 6 is positioned by the first positioning column 3; the PCB circuit board 2 is snap-fitted and fixed on the first buckle structure 11, and the position of the PCB circuit board 2 is fixed by the first buckle structure 11. A plurality of feet 9 of the same height are arranged at the bottom of the inner side of the housing 1 , and the PCB circuit board 2 is placed on the feet 9 to ensure the flatness of the PCB circuit board 2 and to ensure that the lower part of the PCB circuit board 2 is filled with glue of a certain thickness.

[0028] The outer edge of the PCB circuit board 2 is provided with a substrate 21 extending outward, the substrate 21 is a part of the PCB circuit board 2, and is processed integrally with the PCB circuit board 2; the substrate 21 is arranged in the open air gap of the magnetic core 6, the TMR chip 7 is mounted on the substrate 21, and the TMR chip 7 is electrically connected to the PCB circuit board 2. At this time, the TMR chip 7 is located exactly in the middle of the air gap of the magnetic core 6 and does not contact the magnetic core 6. The copper wire 5 passes through the housing 1 and is connected to the PCB circuit board 2, and the copper wire 5 is used to transmit the large current to be measured.

[0029] like Figure 1-Figure 4 As shown: To further realize the auxiliary positioning of the PCB circuit board 2, a preferred embodiment provided by the utility model also includes: a second positioning column 4. The second positioning column 4 is arranged inside the housing 1, and the first positioning column 3 is integrally processed with the housing 1. The second positioning column 4 cooperates with the arc surface on the side of the PCB circuit board 2 to assist in positioning the PCB circuit board 2.

[0030] In a preferred embodiment provided by the present utility model, Figure 1-Figure 4 As shown: the copper wire 5 passes through the inner side of the first positioning column 3 and the second positioning column 4; based on the above design, on the one hand, the space required for arranging the copper wire 5 can be saved; on the other hand, the copper wire 5 can be supported by the first positioning column 3 and the second positioning column 4 to prevent the copper wire 5 from deviating from its position during the glue injection process and affecting the yield rate of the sensor.

[0031] Since the copper wire 5 is a conductor for externally connected large current, a part of it needs to be arranged outside the housing 1. In order to facilitate the fixed support of this part of the copper wire 5, a preferred embodiment provided by the utility model is further provided with: a second buckle structure 10. The second buckle structure 10 is fixed to the outside of the housing 1, and the copper wire 5 is buckled on the second buckle structure 10.

[0032] like Figure 1-Figure 4 As shown: The self-positioning assembled current sensor provided by the embodiment of the utility model has at least the following beneficial effects or advantages:

[0033] The self-positioning assembled current sensor provided by the embodiment of the utility model has a magnetic core 6 which is an annular structure with an open air gap. The PIN pin 8 is arranged at the upper end of the PCB circuit board 2 and connected to the PCB circuit board 2. The housing 1 is arranged as a chamber structure with an open upper portion; a first positioning column 3 and a first buckle structure 11 are arranged inside the housing 1; the magnetic core 6 is sleeved on the first positioning column 3, and the PCB circuit board 2 is fixedly connected to the first buckle structure 11. The outer edge of the PCB circuit board 2 is provided with a substrate 21 extending outward, the substrate 21 is arranged in the air gap of the magnetic core 6, and the TMR chip 7 is installed on the substrate 21; the copper wire 5 passes through the housing 1 and is connected to the PCB circuit board 2. In the self-positioning assembled current sensor, the magnetic core 6 is sleeved on the first positioning column 3, the magnetic core 6 can be positioned by the first positioning column 3, the PCB circuit board 2 is fixedly connected to the first buckle structure 11, and the PCB circuit board 2 can be fixed in position by the first buckle structure 11, thereby preventing the magnetic core 6 and the PCB circuit board 2 from being displaced in the subsequent glue injection process, thereby improving the yield rate of this type of current sensor.

[0034] In the description of the present utility model, it should be noted that the terminology nouns in the various embodiments, such as words indicating directions such as "upper", "lower", "front", "back", "left", "right", etc., are only for simplifying the description of the positional relationship based on the drawings in the specification, and do not mean that the referred elements and devices must be operated according to the specific directions and specified operations and methods and structures in the specification. Such directional nouns do not constitute limitations on the present utility model.

[0035] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood in combination with specific circumstances.

[0036] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A self-positioning assembled current sensor, characterized in that: include: Copper wire, shell, PCB circuit board, TMR chip, PIN needle and magnetic core; The magnetic core is an annular structure provided with an open air gap; The PIN needle is arranged at the upper end of the PCB circuit board and connected to the PCB circuit board; The housing is configured as a chamber structure with an open top; a first positioning column and a first buckle structure are provided inside the housing; the magnetic core is sleeved on the first positioning column, and the PCB circuit board is fixedly connected to the first buckle structure; The outer edge of the PCB circuit board is provided with a substrate extending outward, the substrate is arranged in the open air gap of the magnetic core, and the TMR chip is mounted on the substrate; the copper wire passes through the housing and is connected to the PCB circuit board.

2. The self-positioning assembled current sensor according to claim 1, characterized in that: Also includes: A second positioning column; The second positioning column is arranged inside the housing; The second positioning column cooperates with the arc surface on the side of the PCB circuit board to assist in positioning the PCB circuit board.

3. The self-positioning assembled current sensor according to claim 2, characterized in that: The copper wire passes through the inner sides of the first positioning post and the second positioning post.

4. The self-positioning assembled current sensor according to any one of claims 1 to 3, characterized in that: Also includes: A second buckle structure; The second buckle structure is fixed on the outer side of the shell, and the copper wire is buckled on the second buckle structure.

5. The self-positioning assembled current sensor according to any one of claims 1 to 3, characterized in that: A plurality of feet having the same height are arranged at the bottom of the inner side of the shell, and the PCB circuit board is placed on the feet.

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