Shielding cover and sensor

Abstract

The embodiment of the utility model discloses a shielding case and a sensor, and relates to the technical field of sensor structures. The shielding case comprises a plurality of shielding stacked bodies, any shielding stacked body is formed by stacking a plurality of shielding sheets, and the plurality of shielding stacked bodies are sequentially connected in series so as to define an accommodating cavity for placing a sensing chip. Wherein the plurality of shielding sheets are all of a linear strip-shaped structure, so that the rolling forming direction of any shielding sheet can be the same as the magnetic flux direction of the shielding cover. According to the shielding case, the shielding sheets with the strip-shaped structures can be stacked to form a plurality of shielding stacked bodies, so that the forming direction of each part in the shielding case is the same as the magnetic flux direction of the shielding case, the saturation B value of the shielding case is further improved, and the loss is reduced. Meanwhile, the plurality of shielding stacked bodies which are sequentially connected in series can be spliced to form an accommodating cavity for arranging the sensing chip, so that the sensing chip can work in a good magnetic shielding environment, external magnetic field interference is reduced, and the measurement precision and stability of the sensor are improved.

Description

Technical Field

[0001] This utility model relates to the field of sensor structure technology, and in particular to a shielding cover and a sensor. Background Technology

[0002] Current sensors are often used to detect the magnitude of phase current in motors. Related sensors include... Figure 1 and Figure 2 As shown, where Figure 1 The image shows a C-type sensor, with the shielding cover shaped like a C. The chip is placed within the gaps of the C-shaped shielding cover, and a magnetic plate is located inside the chip. The shielding cover's function is to provide a uniform magnetic field to the chip. In this type of sensor, the magnetic plate inside the chip and the magnetic field are perpendicular. Figure 2 The image shows a U-shaped sensor, with the shielding cover in a U-shape. In this type of sensor, the magnetic sheet and magnetic field inside the chip are parallel. U-shaped sensors are smaller, easier to install, and more robust.

[0003] However, regardless of whether it's a C-type or U-type shield, the shielding sheets that make up the shield have very high conductivity. Therefore, when guiding AC magnetic flux, the shielding sheets need to be segmented; otherwise, significant losses will occur. Figure 1 and Figure 2 This is a schematic diagram; the diagram does not show the markings of the shielding sheet segmentation. Traditional U-shaped shields are often made by stamping thin shielding sheets into a U-shape and then stacking multiple sheets together, such as... Figure 3 The image shows a side view of a U-shaped shield. Assuming the current in the conductor is perpendicular to the paper and outwards, the direction of the magnetic flux inside the U-shaped shield is as shown by the arrow in the figure. Figure 4 The image shown is a top view of the U-shaped shield, which reveals the stacking of the shielding sheets. Figure 5 The image shows a U-shaped shielding sheet that can be stamped from a single profile. Since the profile is a large sheet, shielding sheet 1 and shielding sheet 2 are U-shaped shielding sheets with two different stamping directions. Assuming the rolling direction is along the arrow direction, the magnetic flux directions of shielding sheet 1 and shielding sheet 2 (e.g., ...) Figure 3 As shown, none of these can be completely aligned with the rolling direction, resulting in a lower saturation B value (saturation magnetic induction) and higher losses. Therefore, in related technologies, at least a portion of the stamped U-shaped shielding sheet is perpendicular to the rolling direction, and the core performance of this portion is poor, leading to a decrease in the overall core performance. Furthermore, stamping U-shaped shielding sheets on large profiles also wastes material, indirectly increasing the cost of the sensor. Utility Model Content

[0004] In view of the shortcomings of the prior art, the present invention aims to provide a shielding cover and a sensor. This shielding cover can be formed by stacking multiple shielding sheets of strip structure, so that the forming direction of each part of the shielding cover is the same as the magnetic flux direction of the shielding cover, thereby increasing the saturation B value (saturation magnetic induction intensity) of the shielding cover and reducing losses. Simultaneously, multiple shielding stacks connected in series can be spliced ​​to form a accommodating chamber for accommodating a sensor chip, allowing the sensor chip to operate in a well-shielded magnetic environment, reducing external magnetic field interference, and improving the measurement accuracy and stability of the sensor.

[0005] This utility model discloses a shielding cover for enclosing a sensor chip. It includes:

[0006] Multiple shielding stacks, each shielding stack is formed by stacking multiple shielding sheets, and the multiple shielding stacks are connected in series to enclose and form a accommodating cavity for placing the sensor chip;

[0007] Among them, multiple shielding sheets are all straight strip structures, so that the rolling direction of any shielding sheet can be the same as the magnetic flux direction of the shielding cover.

[0008] Furthermore, a first adhesive is filled between two adjacent shielding stacks.

[0009] Furthermore, each shielding stack also includes connectors, through which multiple stacked shielding sheets are fixed to each other.

[0010] Furthermore, the connector is a fastening screw, and threaded holes are provided in multiple shielding plates; the fastening screw is sequentially inserted into multiple shielding plates through the threaded holes.

[0011] Furthermore, the connector is a second adhesive, and the space between two adjacent shielding sheets is filled with the second adhesive.

[0012] Furthermore, multiple shielding sheets in any shielding stack are stacked along a first preset direction.

[0013] Furthermore, the number of shielding stacks is three, and the three shielding stacks are connected in series to form a "U"-shaped shield.

[0014] Furthermore, the shielding stack located at the bottom of the "U" shape is defined as the bottom stack, and the shielding stack located on the side of the "U" shape is defined as the side stack. In this case, multiple shielding sheets in the side stack are stacked along a second preset direction, and multiple shielding sheets in the bottom stack are stacked along a first preset direction or along a third preset direction.

[0015] The second preset direction is respectively set perpendicular to the first preset direction and the third preset direction.

[0016] Furthermore, the shielding sheet is an oriented silicon steel shielding sheet.

[0017] This utility model embodiment also discloses a sensor, including:

[0018] As mentioned above, a shielding cover;

[0019] The sensor chip is arranged in the accommodating chamber, and the sensor chip is a Hall chip.

[0020] The shielding cover provided by this utility model has the following beneficial effects, including but not limited to:

[0021] 1) The shield can form multiple shield stacks by stacking strip-shaped shielding sheets, so that the forming direction of each part in the shield is the same as the magnetic flux direction of the shield, thereby improving the saturation B value (saturation magnetic induction intensity) of the shield and reducing losses. At the same time, multiple shield stacks connected in series can be spliced ​​to form a accommodating cavity for arranging the sensor chip, so that the sensor chip can work in a good magnetic shielding environment, reduce external magnetic field interference, and improve the measurement accuracy and stability of the sensor.

[0022] 2) The shielding cover adopts a split structure. The strip-shaped shielding sheet is easy to process. Stamping strip-shaped shielding sheets on large profiles can reduce the waste of profiles, thereby indirectly reducing the production cost of the sensor. Attached Figure Description

[0023] This specification will be further described by way of exemplary embodiments, which will be described in detail with reference to the accompanying drawings. These embodiments are not limiting; in these embodiments, the same reference numerals denote the same structures, wherein:

[0024] Figure 1 C-type sensors provided for related technologies;

[0025] Figure 2 U-shaped sensors provided for related technologies;

[0026] Figure 3 A side view of a U-shaped sensor provided for related technologies;

[0027] Figure 4 A top view of a U-shaped sensor provided for related technologies;

[0028] Figure 5 A schematic diagram of the stamping process for shielding sheets provided for related technologies;

[0029] Figure 6 This is a side view of the shielding sheet provided in Embodiment 1 of this utility model;

[0030] Figure 7This is a top view of the shielding sheet provided in Embodiment 1 of this utility model;

[0031] Figure 8 This is a side view of the shielding sheet provided in Embodiment 2 of this utility model;

[0032] Figure 9 This is a top view of the shielding sheet provided in Embodiment 2 of this utility model;

[0033] Figure 10 This is a side view of the shielding sheet provided in Embodiment 3 of this utility model;

[0034] Figure 11 This is a top view of the shielding sheet provided in Embodiment 3 of this utility model.

[0035] Icons: 100 - Shielding cover; 1 - Side stack; 3 - Bottom stack; 4 - Threaded hole; 5 - First adhesive. Detailed Implementation

[0036] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that, unless otherwise specified, the following embodiments and features described therein can be combined with each other.

[0037] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the illustrations only show the components related to the present invention and are not drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0038] Please refer to Figures 6-11 ,in, Figure 6 This is a side view of the shielding sheet provided in Embodiment 1 of this utility model; Figure 7 This is a top view of the shielding sheet provided in Embodiment 1 of this utility model; Figure 8 This is a side view of the shielding sheet provided in Embodiment 2 of this utility model; Figure 9 This is a top view of the shielding sheet provided in Embodiment 2 of this utility model; Figure 10 This is a side view of the shielding sheet provided in Embodiment 3 of this utility model; Figure 11This is a top view of the shielding sheet provided in Embodiment 3 of this utility model. This utility model provides a shielding cover 100, which includes multiple shielding stacks. Each shielding stack is formed by stacking multiple shielding sheets, and the multiple shielding stacks are connected in series to enclose and form an accommodating cavity (not shown in the figure) for placing a sensor chip. The multiple shielding sheets are all linear strip structures, so that the rolling direction of any shielding sheet is the same as the magnetic flux direction of the shielding cover 100.

[0039] It is worth noting that the shielding cover 100 can be formed by stacking multiple shielding sheets with strip-shaped structures, so that the forming direction of each part of the shielding cover 100 is the same as the magnetic flux direction of the shielding cover 100, thereby increasing the saturation B value (saturation magnetic induction intensity) of the shielding cover 100 and reducing losses. At the same time, multiple shielding stacks connected in series can be spliced ​​to form a accommodating chamber for accommodating the sensor chip, so that the sensor chip can work in a good magnetic shielding environment, reducing external magnetic field interference and improving the measurement accuracy and stability of the sensor.

[0040] It is also worth noting that the shielding cover 100 adopts a split structure. The strip-shaped shielding sheet is easy to process. Stamping strip-shaped shielding sheets on large profiles can reduce the waste of profiles, thereby indirectly reducing the production cost of the sensor.

[0041] Optionally, a first adhesive 5 is filled between two adjacent shielding stacks.

[0042] Specifically, the filling of the first adhesive 5 can firmly fix adjacent shielding stacks, preventing loosening, misalignment, or deformation, and improving overall mechanical stability. Simultaneously, the filling of the first adhesive 5 can reduce gaps, thereby reducing magnetic flux leakage, making the magnetic shielding effect more complete and uniform, and improving the ability of the shielding cover 100 to suppress external interference magnetic fields. In this embodiment, the first adhesive 5 can be epoxy resin. Epoxy resin has high strength and durability; its cured strength is high, it can maintain structural stability for a long time, and it avoids generating additional electromagnetic interference, making it suitable for long-term applications. Depending on the specific implementation environment, other materials can also be used as the first adhesive 5.

[0043] In this embodiment, each shielding stack also includes a connector, through which multiple stacked shielding sheets are fixed to each other.

[0044] It is worth noting that the shielding stack is composed of multiple shielding sheets stacked together. Without a reliable fixing method, the sheets may become misaligned or loose due to vibration, external force, or long-term use. In this embodiment, the shielding sheets can be firmly fixed by connectors, so that the shielding stack as a whole remains stable, ensuring the long-term reliability of the shielding cover 100, reducing the risk of magnetic flux leakage, and improving the magnetic shielding capability of the shielding cover 100.

[0045] Optionally, such as Figure 6 As shown, the connector can be a fastening screw, and threaded holes 4 are provided in multiple shielding plates; wherein, the fastening screw is sequentially inserted into multiple shielding plates through the threaded holes 4.

[0046] Specifically, screw fixing is more reliable, providing higher mechanical strength and ensuring a tight fit between the shielding sheets, preventing loosening, deformation, or misalignment due to vibration or external forces. It also offers superior long-term stability, making it suitable for applications requiring high strength and durability, such as magnetic shielding components in high-vibration and high-temperature environments.

[0047] Optionally, the connector can be a second adhesive, with the space between two adjacent shielding sheets filled with the second adhesive.

[0048] Specifically, the second adhesive can be made of the same material as the first adhesive 5, or it can be made of other materials. Compared with the screw fixing mentioned above, it does not require drilling threaded holes 4 on the shielding sheet, thereby reducing processing steps. The adhesive method can be directly applied and bonded, reducing processing steps and improving production efficiency. Its cost is lower than that of screws and thread processing, and it can significantly reduce manufacturing costs in large-scale production.

[0049] In this embodiment, multiple shielding sheets in any shielding stack are stacked along a first preset direction.

[0050] It should be noted that, such as Figure 6 and Figure 7 In the embodiment shown, multiple shielding sheets are stacked along a first preset direction, wherein the first preset direction refers to... Figure 6 With the orientation perpendicular to the paper, this stacking method ensures that all shielding sheets are aligned in the same direction, resulting in optimal magnetic permeability in a uniform direction. Furthermore, the consistent orientation of all shielding sheets allows for the use of standardized production equipment and processes for processing and placement, avoiding complex multi-directional stacking and simplifying the production process.

[0051] Optionally, the number of shielding stacks is three, and the three shielding stacks are connected in series to form a "U"-shaped shielding cover 100.

[0052] Specifically, the number of shielding stacks can be 2, 4, 5, etc., to form a "C"-shaped or other shaped shielding cover 100. This embodiment does not constitute a limitation on the specific structural type of the shielding cover 100, but is only an example to illustrate its structural type.

[0053] In this embodiment, as Figures 8-11 As shown, the shielding stack located at the bottom of the "U" shape is defined as the bottom stack 3, and the shielding stack located on the side of the "U" shape is defined as the side stack 1. The multiple shielding sheets in the side stack 1 are stacked along a second preset direction, and the multiple shielding sheets in the bottom stack 3 are stacked along a first preset direction or a third preset direction. The second preset direction is perpendicular to the first preset direction and the third preset direction, respectively.

[0054] Understandably, the first preset direction refers to, for example... Figure 8 The direction perpendicular to the paper surface, the second preset direction refers to Figure 8 The diagram shows the directions from left to right; the third preset direction refers to... Figure 8 The diagram shows the direction from top to bottom. In this embodiment, the bottom stack 3 and the side stack 1 adopt different stacking directions, which can provide uniform mechanical support in different directions and reduce stress concentration in the overall structure. In addition, this stacking method can be applied to devices with various shapes and structures, which is beneficial for adaptability design according to specific size requirements and meets the space occupation requirements of different sensors.

[0055] In this embodiment, the shielding sheet is an oriented silicon steel shielding sheet.

[0056] This embodiment also includes a sensor comprising the shield 100 as described above and a sensing chip, the sensing chip being disposed within a receiving chamber, and the sensing chip being a Hall effect chip. This sensor possesses all the beneficial effects of the shield 100.

[0057] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

[0058] Throughout this description, numerous specific details, such as examples of components and / or methods, are provided to provide a complete understanding of embodiments of the present invention. However, those skilled in the art will recognize that embodiments of the present invention may be practiced without one or more of these specific details or by other devices, systems, components, methods, parts, materials, components, etc. In other instances, well-known structures, materials, or operations have not been specifically shown or described in detail to avoid obscuring aspects of embodiments of the present invention.

[0059] Throughout this specification, references to "an embodiment," "an embodiment," or "a specific embodiment" mean that a particular feature, structure, or characteristic described in connection with an embodiment is included in at least one embodiment of the present invention, but not necessarily in all embodiments. Therefore, the various representations of the phrases "in one embodiment," "in an embodiment," or "in a specific embodiment" in different places throughout the specification do not necessarily refer to the same embodiment. Furthermore, a particular feature, structure, or characteristic of any specific embodiment of the present invention can be combined with one or more other embodiments in any suitable manner. It should be understood that other variations and modifications of the embodiments of the present invention shown herein may be based on the teachings herein and will be considered part of the spirit and scope of the present invention.

[0060] It should also be understood that one or more of the elements shown in the figures may be implemented in a more separate or more integrated manner, or may even be removed because they are inoperable in certain circumstances or provided because they may be useful for a particular application.

[0061] Furthermore, unless otherwise expressly stated, any arrows in the accompanying drawings should be considered illustrative only and not limiting. Additionally, unless otherwise stated, the term "or" as used herein is generally intended to mean "and / or". Where a term is anticipated to provide a separation or combination capability that is unclear, a combination of components or steps will also be considered as indicated.

[0062] As used herein and throughout the claims below, unless otherwise specified, “a” and “the” include the plural references. Similarly, as used herein and throughout the claims below, unless otherwise specified, “in” means “in” and “on”.

[0063] The above description of the embodiments shown in this utility model (including the content in the abstract of the specification) is not intended to be an exhaustive enumeration or to limit the utility model to the precise forms disclosed herein. Although specific embodiments and examples of the utility model have been described herein for illustrative purposes only, various equivalent modifications are possible within the spirit and scope of the utility model, as will be recognized and understood by those skilled in the art. As indicated, these modifications can be made to the utility model in accordance with the above description of the embodiments of the utility model, and such modifications will be within the spirit and scope of the utility model.

[0064] This document has generally described the systems and methods in detail to aid in understanding the present invention. Furthermore, various specific details have been set forth to provide a general understanding of embodiments of the present invention. However, those skilled in the art will recognize that embodiments of the present invention can be practiced without one or more specific details, or using other devices, systems, accessories, methods, components, materials, parts, etc. In other instances, well-known structures, materials, and / or operations have not been specifically shown or described in detail to avoid obscuring aspects of embodiments of the present invention.

Claims

1. A shielding cover for enclosing a sensing chip, characterized in that, include: Multiple shielding stacks, each of which is formed by stacking multiple shielding sheets, and the multiple shielding stacks are connected in series to enclose and form an accommodating cavity for placing the sensing chip; Among them, all of the shielding sheets are linear strip structures, so that the rolling direction of any shielding sheet can be the same as the magnetic flux direction of the shielding cover.

2. The shielding cover according to claim 1, characterized in that, A first adhesive is used to fill the space between two adjacent shielding stacks.

3. The shielding cover according to claim 1, characterized in that, Each of the shielding stacks further includes a connector, through which the multiple stacked shielding sheets are fixed to each other.

4. The shielding cover according to claim 3, characterized in that, The connector is a fastening screw, and each of the multiple shielding plates has a threaded hole; wherein, the fastening screw passes through the threaded hole in sequence through the multiple shielding plates.

5. The shielding cover according to claim 3, characterized in that, The connector is a second adhesive, and the space between two adjacent shielding sheets is filled with the second adhesive.

6. The shielding cover according to claim 1, characterized in that, The plurality of shielding sheets in any of the shielding stacks are stacked along a first preset direction.

7. The shielding cover according to claim 1, characterized in that, The number of shielding stacks is three, and the three shielding stacks are connected in series to form a "U"-shaped shield.

8. The shielding cover according to claim 7, characterized in that, The shielding stack located at the bottom of the "U" shape is defined as the bottom stack, and the shielding stack located on the side of the "U" shape is defined as the side stack. The plurality of shielding sheets in the side stack are stacked along a second preset direction, and the plurality of shielding sheets in the bottom stack are stacked along a first preset direction or a third preset direction. The second preset direction is respectively perpendicular to the first preset direction and the third preset direction.

9. The shielding cover according to claim 1, characterized in that, The shielding sheet is an oriented silicon steel shielding sheet.

10. A sensor, characterized in that, include: The shielding cover as described in any one of claims 1-9; A sensor chip is disposed in the accommodating chamber, and the sensor chip is a Hall chip.

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