CN214382043U

CN214382043U - Open-loop sensor magnetic core shielding piece elastic contact structure assembly

Info

Publication number: CN214382043U
Application number: CN202120458548.6U
Authority: CN
Inventors: 邹高芝; 魏义松
Original assignee: Nanjing Token Electronic Technology Co ltd
Current assignee: Nanjing Token Electronic Technology Co ltd
Priority date: 2021-03-03
Filing date: 2021-03-03
Publication date: 2021-10-08
Anticipated expiration: 2031-03-03

Abstract

The utility model relates to an open-loop sensor magnetic core shielding piece elastic contact structure subassembly, including shielding piece and hall subassembly, the constant head tank has been seted up to the centre inside of shielding piece, the hall subassembly cartridge is in the constant head tank, be equipped with spring point, every side on the both sides contact surface of shielding piece respectively the spring point is equipped with one at least, the spring point perk that makes progress, the bottom both sides of shielding piece are equipped with the leg. At 2 or above spring points of the both sides shaping of shielding piece 1, utilize red copper's resilience to reach elastic contact's purpose, the more effectual contact effect with the magnetic core of shielding piece has been guaranteed to 2 or above spring points, has guaranteed the quality of ring-opening type sensor product, and the bottom both sides of shielding piece are equipped with the leg, and the shielding piece passes through leg lug weld on the PCB board. The whole installation process does not need a screw driving process, and the quality of the open-loop sensor product is also ensured.

Description

Open-loop sensor magnetic core shielding piece elastic contact structure assembly

Technical Field

The utility model relates to a hall current sensor technical field especially relates to an open loop type sensor magnetic core shielding piece elastic contact structure subassembly.

Background

The non-contact measurement and monitoring methods for the current are many, and the Hall current sensor is widely applied due to the excellent cost performance to form industrialization; the Hall current sensor generally has two working modes of open loop and closed loop, and the open loop type Hall current sensor is a novel current sensor, has the characteristics of high sensitivity, low power consumption, electric isolation, high cost performance, convenient use and the like, and is widely applied to the automatic control field of various current conversion technologies, alternating current numerical control devices and the like which take current as a measurement and monitoring object.

With the development of power electronics, various current transformation technologies, alternating current numerical control devices and the like are changing day by day, and in the field of automatic control using current as a measurement and monitoring object, particularly in the fields of electric automobiles, rail transit, renewable energy base station equipment and the like, a current sensor is required to have good consistency and also must reliably work in a more complex electromagnetic environment; under the conditions of global economic recovery and debilitation and increasingly severe market competition, the current sensor has higher cost performance, and in order to adapt to application environments and meet market requirements, various manufacturers at home and abroad try to best achieve the best, and the current sensor with higher anti-interference capability, higher performance and lower price and high cost performance is developed.

The open-loop Hall current sensor consists of Hall element, soft magnetic material made into loop magnetic core with air gap and proper amplifier circuit. The working process is as follows: the magnetic induction intensity generated by the primary current in the air gap of the magnetic core is detected by a Hall element, and the output voltage of the Hall element is adjusted and amplified to 0-4V or 0-5V through an amplifier and output. The working process of the current sensor is an open loop structure, so the current sensor is called as an open loop type Hall current sensor.

Since the open-loop hall current sensor is generally used for measuring a large current of 50 a or more, the magnetic induction intensity in the magnetic core is relatively high, and magnetic saturation is likely to occur for a magnetic core of a given cross-sectional area. In order to improve the linear measurement range of the hall current sensor, the air gap width of the magnetic core must be increased or the number of the air gaps must be increased, so that the leakage flux at the air gap of the magnetic core is increased, and the capability of resisting electromagnetic interference of the hall current sensor is reduced. In order to improve the anti-electromagnetic interference capability of the Hall current sensor, manufacturers at home and abroad generally adopt the magnetic core to be grounded and use a copper strip to be wound outside the magnetic core to shield the air gap of the magnetic core, and the air gap shielding structure of the magnetic core has the following problems:

the plane contact effect of the shielding sheet is poor, and if the magnetic core and the shielding sheet are assembled unevenly, poor contact can be caused, and the performance is influenced. Generally, screws are used for fixing the shielding sheet on a PCB, and the electric screwdriver head is easy to accidentally damage elements in the operation process, so that potential quality hazards are caused.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an open loop type sensor magnetic core shielding piece elastic contact structure subassembly to solve the problem that meets in the above-mentioned background art.

In order to achieve the above purpose, the technical scheme of the utility model is as follows:

the utility model provides an open-loop sensor magnetic core shielding piece elastic contact structure subassembly, includes shielding piece and hall subassembly, the constant head tank has been seted up to the centre inside of shielding piece, the hall subassembly cartridge is in the constant head tank, be equipped with the spring point on the both sides contact surface of shielding piece respectively, every side the spring point is equipped with one at least, the spring point perk that makes progress, the bottom both sides of shielding piece are equipped with the leg.

And positioning fulcrums are arranged around the inside of the positioning groove.

And a positioning frame is arranged in the positioning groove.

The upward tilting angle of the spring point is 10-15 degrees.

The shielding sheet is a 0.3mm red copper sheet.

The outer sides of the contact surfaces on the two sides of the shielding sheet are respectively provided with at least one spring point, and the spring points are tilted upwards.

In the above-mentioned scheme, the first step of the method,

compared with the prior art, the beneficial effects of the utility model are that:

1. at 2 or above spring points of the both sides shaping of shielding piece 1, utilize red copper's resilience to reach the purpose of elastic contact, 2 or above spring points have guaranteed the more effective contact effect with the magnetic core of shielding piece, have guaranteed the quality of open-loop type sensor product.

2. And welding feet are arranged on two sides of the bottom of the shielding sheet, and the shielding sheet is directly welded on the PCB through the welding feet. The whole installation process does not need a screw driving process, the quality of the open-loop type sensor product is also ensured, the production efficiency is greatly improved, the production cost is reduced, the anti-electromagnetic interference capability of the open-loop type Hall current sensor is also greatly improved, and the anti-electromagnetic pulse group discharge voltage of the open-loop type Hall current sensor is improved to +/-4800 volts from less than 1500 volts.

Drawings

The disclosure of the present invention is explained with reference to the drawings. It is to be understood that the drawings are designed solely for the purposes of illustration and not as a definition of the limits of the invention. In the drawings, like reference numerals are used to refer to like parts. Wherein:

FIG. 1 is a schematic view of the overall structure of the present invention;

fig. 2 is a schematic top view of the shielding plate of the present invention;

fig. 3 is a schematic top view of a shield sheet according to embodiment 2 of the present invention;

fig. 4 is a schematic side view of the shielding sheet according to embodiment 2 of the present invention;

fig. 5 is a schematic top view of a shield sheet according to embodiment 3 of the present invention;

fig. 6 is a schematic side view of a shield sheet according to embodiment 3 of the present invention;

FIG. 7 is a schematic view of the assembly structure of the present invention and a PCB;

FIG. 8 is a schematic view of the assembly structure of the present invention with a PCB and a magnetic core;

fig. 9 is a schematic view of the assembly structure of the present invention with the PCB, the magnetic core, and the housing;

reference numbers in the figures: 1-a shielding sheet; 11-spring point; 12-positioning grooves; 13-positioning the fulcrum; 14-a solder fillet; 15-positioning frame; 2-a hall assembly; 21-Hall element positioning frame; 22-a hall element; 3-a PCB board; 4-a magnetic core; 41-voids; 5-a housing; 51-hook.

Detailed Description

In order to make the technical means, creation features, achievement purposes and functions of the present invention easy to understand, the present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic drawings and illustrate the basic structure of the invention only in a schematic way, and therefore they show only the relevant components of the invention.

According to the technical scheme of the utility model, under the essential spirit of the utility model, general technical personnel in this field can propose the multiple structural style and the realization that can replace each other. Therefore, the following detailed description and the accompanying drawings are merely illustrative of the technical solutions of the present invention, and should not be considered as limiting or restricting the technical solutions of the present invention in their entirety or in any other way.

The technical solution of the present invention will be further described in detail with reference to the accompanying drawings and embodiments.

Embodiment 1, as shown in fig. 1 and 2, an open-loop sensor magnetic core shield piece elastic contact structure assembly includes a shield piece 1 and a hall assembly 2, a positioning groove 12 is provided in the middle of the shield piece 1, and the shield piece 1 is made of a 0.3mm red copper sheet. The Hall assembly 2 comprises a Hall element positioning frame 21 and a Hall element 22, the Hall element 22 is connected with the Hall element positioning frame 21 in an inserting mode, and the Hall assembly 2 is integrally inserted into the positioning groove 12.

As a preferable scheme, the positioning supporting points 13 are arranged around the inside of the positioning groove 12, and the four positioning supporting points 13 are used for clamping and fixing the periphery of the hall assembly 2.

The contact surfaces of the two sides of the shielding plate 1 are respectively provided with spring points 11, one spring point 11 is arranged on each side, the spring points 11 are tilted upwards, and the upward tilting angle of the spring points 11 is 10-15 degrees, preferably 14 degrees. Both sides of the bottom of the shielding plate 1 are provided with solder tails 14, and the shielding plate 1 is directly welded on the PCB through the solder tails 14. 2 or above spring point 11 of both sides shaping at shielding piece 1 utilize red copper's resilience to reach the purpose of elastic contact, and 2 or above spring point 11 have guaranteed the more effective contact effect with magnetic core 4 of shielding piece 1, have guaranteed the quality of open-loop type sensor product.

Example 2, as shown in fig. 3 and 4, is different from example 1 in that: two spring points 11 are arranged on each side of the two sides of the

shielding sheet

1, 4 spring points 11 are arranged in total, and the contact area of the shielding sheet and the magnetic core 4 is enlarged.

Example 3, as shown in fig. 5 and 6, is different from example 1 in that: the positioning frame 15 is arranged inside the positioning groove 12, the positioning groove is formed in the positioning frame 15, and the positioning groove is of a rectangular frame-shaped structure and is used for clamping and fixing the periphery of the Hall assembly 2.

As a preferable scheme, the outer sides of the contact surfaces on both sides of the shielding plate 1 are respectively provided with at least one spring point 11, the spring point 11 is tilted upwards, and the upward tilting angle of the spring point 11 is 10-15 degrees, preferably 14 degrees.

When the shielding piece is manufactured, the shielding piece 1 is processed by using the red copper sheet with the thickness of 0.3mm through cold punching, bending forming and tinning, so that certain mechanical strength of the shielding piece 1 is ensured, and the weldability of pins on the shielding piece 1 is also ensured; the shell 5 of the Hall element fixing frame is formed by injection molding through a plastic mold, and the thickness of the air gap part of the magnetic core 4 arranged on the shell 5 is smaller than the minimum width of the air gap of the magnetic core 4.

When the utility model is installed, please refer to fig. 7 to fig. 9, the assembly sequence is: the first leg of the hall element 22 is mounted on the hall element holder 21 according to the direction indicating port on the hall element holder 21, thereby forming the hall assembly 2. The positioning groove 12 on the shielding plate 1 is sleeved on the hall element fixing frame 21 to firmly fix the hall assembly 2. Then, pins of the Hall element 22 penetrate through the welding holes according to the installation direction of the Hall element 22 on the PCB 3, then the pins of the shielding plate 1 penetrate through the corresponding welding holes on the PCB 3, are pressed to the bottom and then are welded with the PCB 3; will install the utility model discloses a 3 makeup clothes-peg of PCB board of magnetic core air gap shielding subassembly for ring-opening type hall current sensor are adorned on overflowing the frame, realize automatic weld with wave-soldering.

The magnetic core 4 is fixed at the bottom of the inner cavity of the shell 5 by glue, then the components are arranged in the shell 5, the head part of the Hall component 2 is inserted into the gap 41 of the magnetic core 4, and the PCB 3 is fixedly arranged in the shell by utilizing the clamping hooks 51 at the two sides of the shell 5 of the sensor. The whole installation process does not need a screw driving process, the quality of the open-loop type sensor product is also ensured, the production efficiency is greatly improved, the production cost is reduced, the anti-electromagnetic interference capability of the open-loop type Hall current sensor is also greatly improved, and the anti-electromagnetic pulse group discharge voltage of the open-loop type Hall current sensor is improved to +/-4800 volts from less than 1500 volts.

The above-mentioned embodiments further explain in detail the objects, technical solutions and advantages of the present invention, and it should be understood that the above-mentioned embodiments are only the embodiments of the present invention, and are not intended to limit the scope of the present invention, any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the scope of the present invention.

Claims

1. The utility model provides an open-loop type sensor magnetic core shielding piece elastic contact structure subassembly, includes shielding piece (1) and hall subassembly (2), constant head tank (12) have been seted up to the middle inside of shielding piece (1), hall subassembly (2) cartridge is in constant head tank (12), its characterized in that: be equipped with spring point (11) on the both sides contact surface of shielding piece (1) respectively, every side spring point (11) are equipped with one at least, spring point (11) perk that makes progress, the bottom both sides of shielding piece (1) are equipped with leg (14).

2. The open-loop sensor core shield spring contact structural assembly of claim 1, wherein: and positioning fulcrums (13) are arranged around the inside of the positioning groove (12).

3. The open-loop sensor core shield spring contact structural assembly of claim 1, wherein: and a positioning frame (15) is arranged in the positioning groove (12).

4. The open-loop sensor core shield spring contact structural assembly of claim 1, wherein: the upward tilting angle of the spring point (11) is 10-15 degrees.

5. The open-loop sensor core shield spring contact structural assembly of claim 1, wherein: the shielding sheet (1) is a copper sheet with the thickness of 0.3 mm.

6. The open-loop sensor core shield spring contact structural assembly of claim 1, wherein: the outer sides of the contact surfaces on the two sides of the shielding sheet (1) are respectively provided with spring points (11), at least one spring point (11) is arranged on each side, and the spring points (11) tilt upwards.