A PCB shielding cover, a PCB circuit and an electrical appliance

Abstract

The application provides a PCB shielding cover, a PCB circuit and an electrical equipment, wherein the PCB shielding cover is arranged on the PCB, the digital ground and the analog ground are most completely connected together, the complexity of ground connection is reduced, the layout and maintenance of the circuit are simplified, the PCB is easier to design and maintain, the problem that the complete separation of ground connection may cause the backflow distance of high-speed digital signals to be too far, thereby increasing the radiation range of the digital signals, increasing the risk of crosstalk, and affecting the overall performance and reliability of the circuit is solved, the digital ground and the analog ground on the PCB are respectively arranged on the diagonal positions of the PCB, the problem that the analog circuit is poor in anti-digital circuit interference without distinguishing the analog ground and the digital ground, the sampled signals have more digital interference signals, and the high-speed AD cannot achieve good performance is avoided, and the problem that the complete separation of ground connection is avoided, the digital signal interference is reduced through the common ground connection.

Description

Technical Field

[0001] This invention relates to the field of intelligent equipment technology, specifically to a PCB board shielding cover, PCB circuit, and electrical equipment. Background Technology

[0002] High-speed PCB (Printed Circuit Board) design is one of the most important areas in electronic engineering. It involves the complex integration of digital and analog circuits and is commonly used in various high-performance electronic devices, such as communication equipment, data storage devices, and high-speed data acquisition systems.

[0003] In traditional high-speed PCB design, ground connections between digital and analog circuits are often a challenging issue. Interconnection and interference between digital and analog grounds can lead to degraded circuit performance, increased noise, and reduced signal quality. These problems can be particularly pronounced when the physical connections between digital and analog grounds are complex or unclear. Current technologies typically employ a ground separation strategy, completely separating digital and analog grounds to reduce interference. However, this approach can increase the complexity of ground connections, hindering board maintenance and debugging.

[0004] Another technical background issue is interference between digital and analog circuits. Without distinguishing between analog and digital grounds, digital circuits can cause significant interference to analog circuits, affecting their performance, especially in applications such as high-speed AD converters.

[0005] Therefore, it is imperative to meet the following requirements simultaneously in high-speed PCB design:

[0006] Reduce the complexity of connections between digital and analog grounds;

[0007] Improve the anti-digital interference performance of analog circuits;

[0008] Avoid completely isolated connections to reduce the risk of radiation and crosstalk from digital signals. Summary of the Invention

[0009] The purpose of this invention is to overcome the above-mentioned technical deficiencies and provide a PCB board shielding cover, PCB circuit and electrical equipment to solve the problem of mutual interference between digital ground and analog ground in PCB boards in related technologies.

[0010] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution:

[0011] According to a first aspect of the present invention, a PCB board shielding cover is provided, comprising:

[0012] Top cover, and supporting eaves welded under the top cover;

[0013] The supporting eaves are provided along the outer edge of the top cover, forming a closed structure;

[0014] The bottom of the support eaves is provided with solder feet for soldering to the digital ground and / or analog ground on the PCB board.

[0015] Preferably, the height of the support eaves is greater than the height of the tallest component on the PCB board, and also higher than the preset height of the tallest component on the PCB board.

[0016] Preferably, the support eaves are regular polygons, including: squares, rectangles, regular hexagons, and regular octagons; the solder holes for digital ground and / or analog ground on the PCB are arranged on the PCB by projecting their paths onto the PCB when the support eaves are placed horizontally above the PCB.

[0017] Preferably, the top cover, and / or the support eaves, have perforations for heat dissipation of the PCB board.

[0018] Preferably, both the top cover and the supporting eaves are made of conductive material.

[0019] Preferably, the conductive material includes aluminum or copper.

[0020] According to a second aspect of the present invention, a PCB circuit is provided, comprising:

[0021] PCB board and the aforementioned PCB board shielding cover.

[0022] Preferably, the digital circuits and analog circuits on the PCB are arranged in different areas;

[0023] Differential signal routing is used internally in both the digital and analog circuits.

[0024] Preferably, the digital ground and analog ground on the PCB are respectively located at diagonal positions on the PCB; and / or, the ground layer of the PCB has an isolation cut or opening between the digital ground and the analog ground.

[0025] According to a third aspect of the present invention, an electrical appliance is provided, comprising:

[0026] The PCB circuit described above.

[0027] The technical solutions provided by the embodiments of the present invention may include the following beneficial effects:

[0028] By covering the PCB board with a PCB shield, the digital ground and analog ground are connected together in the most distant and complete way, which reduces the complexity of ground connection, simplifies circuit layout and maintenance, and makes the PCB board easier to design and maintain. It solves the problem that completely separated ground connections may cause high-speed digital signal return distances to be too far, thereby increasing the radiation range of digital signals, increasing the risk of crosstalk, and affecting the overall performance and reliability of the circuit.

[0029] Furthermore, the digital ground and analog ground on the PCB are respectively located diagonally on the PCB. This avoids the situation where analog circuits are less resistant to digital circuit interference, resulting in more digital interference signals in the sampled signal, which hinders the performance of high-speed AD converters, when analog and digital grounds are not distinguished. Simultaneously, because the PCB shielding cover has a closed structure, the digital ground and analog ground are connected together in the most complete and farthest possible way, reducing the complexity of ground connections, simplifying circuit layout and maintenance, and making the circuit board easier to design and maintain. This solves the problem in traditional high-speed PCB designs where the ground connection between digital and analog circuits can be very complex, leading to complex circuit layout, difficult maintenance, and a high risk of connection errors. At the same time, it avoids completely separate ground connections, reducing digital signal interference through a common ground connection. Attached Figure Description

[0030] Figure 1 This is a top view of a PCB shielding cover according to an exemplary embodiment;

[0031] Figure 2 This is a bottom view of a PCB shielding cover according to an exemplary embodiment;

[0032] Figure 3 This is a schematic diagram of a PCB board according to an exemplary embodiment. Detailed Implementation

[0033] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0034] Example 1

[0035] Figure 1 This is a top view of a PCB shielding cover according to an exemplary embodiment. Figure 2 This is a bottom view of a PCB shielding cover according to an exemplary embodiment, see below. Figure 1 and Figure 2 The PCB shielding cover includes:

[0036] Top cover, and supporting eaves welded under the top cover;

[0037] The supporting eaves are provided along the outer edge of the top cover, forming a closed structure;

[0038] The bottom of the support eaves is provided with solder feet for soldering to the digital ground and / or analog ground on the PCB board.

[0039] Understandably, by covering the PCB board with a PCB shield, the digital ground and analog ground are connected together in the most distant and complete way, which reduces the complexity of ground connection, simplifies circuit layout and maintenance, and makes the PCB board easier to design and maintain. It also solves the problem that completely separated ground connections may cause high-speed digital signal return distances to be too far, thereby increasing the radiation range of digital signals, increasing the risk of crosstalk, and affecting the overall performance and reliability of the circuit.

[0040] Preferably, the height of the support eaves is greater than the height of the tallest component on the PCB board, and also higher than the preset height of the tallest component on the PCB board.

[0041] Understandably, to avoid affecting the normal operation of the circuitry on the PCB, the PCB shielding needs to have a certain height. This is for both heat dissipation and minimizing impact on the circuitry. Generally, the height of the support eaves is set higher than the preset height of the tallest component on the PCB. This preset height is set according to user needs or based on historical experience.

[0042] Preferably, the support eaves are regular polygons, including: squares, rectangles, regular hexagons, and regular octagons; the solder holes for digital ground and / or analog ground on the PCB are arranged on the PCB by projecting their paths onto the PCB when the support eaves are placed horizontally above the PCB.

[0043] It is understandable that properly designing the shape and size of the PCB shield can ensure that it can completely cover the target area of ​​the circuit on the PCB, including both digital and analog circuit sections.

[0044] It is understood that, since the support eaves are connected to the digital ground and / or analog ground on the PCB board, the projection trajectory of the solder holes for the digital ground and / or analog ground on the PCB board when the support eaves are placed horizontally above the PCB board ensures a tight connection between the support eaves and the PCB board. In practice, appropriate ground connectors, such as conductive paths or connection pins, are designed on the PCB board shield to ensure that the digital ground and analog ground are correctly connected to the mixed ground plane. It is understood that the technical solution provided in this embodiment, by using the PCB board shield as a mixed ground plane for analog and digital grounds, achieves the furthest and most complete connection scheme for analog and digital grounds.

[0045] Preferably, the top cover, and / or the support eaves, have perforations for heat dissipation of the PCB board.

[0046] It is understood that the top cover and / or the support eaves have perforations for heat dissipation of the PCB board, which can ensure that the circuits on the PCB board can still dissipate heat normally after the PCB board shielding cover is installed, thus ensuring the normal operation of the circuit.

[0047] Preferably, both the top cover and the supporting eaves are made of conductive material.

[0048] Preferably, the conductive material includes aluminum or copper.

[0049] Understandably, the top cover and support eaves are made of conductive materials, which ensures that the current on the digital ground and analog ground can be smoothly transmitted to the shield, and then transmitted to the ground through the shield, thus ensuring the safe operation of the PCB board.

[0050] In summary, the technical solution provided in this embodiment, by covering the PCB board with a PCB board shield, connects the digital ground and analog ground together in the farthest and most complete way, reducing the complexity of ground connection, simplifying circuit layout and maintenance, and making the PCB board easier to design and maintain; it solves the problem that completely separated ground connections may cause the high-speed digital signal return distance to be too far, thereby increasing the radiation range of digital signals, increasing the risk of crosstalk, and affecting the overall performance and reliability of the circuit.

[0051] Example 2

[0052] A PCB circuit according to an exemplary embodiment includes:

[0053] PCB board and the aforementioned PCB board shielding cover.

[0054] It is understood that the technical solution provided in this embodiment, by covering the PCB board with a PCB board shield, connects the digital ground and analog ground together in the farthest and most complete way, reducing the complexity of ground connection, simplifying circuit layout and maintenance, and making the PCB board easier to design and maintain; it solves the problem that completely separated ground connections may cause the high-speed digital signal return distance to be too far, thereby increasing the radiation range of digital signals, increasing the risk of crosstalk, and affecting the overall performance and reliability of the circuit.

[0055] Preferably, see Figure 3 The digital and analog circuits on the PCB are respectively arranged in different areas;

[0056] Differential signal routing is used internally in both the digital and analog circuits.

[0057] It is understandable that the digital and analog circuits on the PCB are arranged in different areas; the digital circuits use differential signal routing, and the analog circuits use differential signal routing, which solves the problem that when the digital ground and analog ground are not clearly separated, the digital circuits may interfere with the analog circuits and reduce the performance of the analog circuits.

[0058] Furthermore, the digital ground and analog ground on the PCB are respectively located at diagonal positions on the PCB; and / or, the ground layer of the PCB has an isolation cut or opening between the digital ground and the analog ground.

[0059] It should be noted that the ground plane of the PCB board has an isolation notch or opening between the digital ground and the analog ground to better isolate the digital ground and the analog ground. The isolation notch or opening is equivalent to an isolation channel, used to cut off the electrical connection between the digital ground and the analog ground, and to isolate signal crosstalk between the digital ground and the analog ground.

[0060] It is understood that in the technical solution provided in this embodiment, the digital ground and analog ground on the PCB board are respectively arranged on the diagonal positions of the PCB board. This avoids the situation where analog circuits are less resistant to digital circuit interference when analog ground and digital ground are not distinguished, resulting in a large amount of digital interference signals in the sampled signal, which prevents the achievement of good performance of high-speed AD. At the same time, since the supporting eaves of the PCB board shield are designed as a closed structure, the digital ground and analog ground are connected together in the most distant and complete way, reducing the complexity of ground connection, simplifying circuit layout and maintenance, and making the circuit board easier to design and maintain. This solves the problem that in traditional high-speed PCB board design, the ground connection between digital circuits and analog circuits can be very complex, leading to complex circuit layout, difficult maintenance, and easy connection errors. In addition, it avoids completely separated ground connections and reduces digital signal interference through a common ground connection.

[0061] Example 3

[0062] An electrical appliance according to an exemplary embodiment includes:

[0063] The PCB circuit described above.

[0064] It is understood that the technical solution provided in this embodiment, by covering the PCB board with a PCB board shield, connects the digital ground and analog ground together in the farthest and most complete way, reducing the complexity of ground connection, simplifying circuit layout and maintenance, and making the PCB board easier to design and maintain; it solves the problem that completely separated ground connections may cause the high-speed digital signal return distance to be too far, thereby increasing the radiation range of digital signals, increasing the risk of crosstalk, and affecting the overall performance and reliability of the circuit.

[0065] Furthermore, in the technical solution provided in this embodiment, the digital ground and analog ground on the PCB board are respectively arranged on the diagonal positions of the PCB board. This avoids the situation where analog circuits are poorly resistant to digital circuit interference when analog grounds and digital grounds are not distinguished, resulting in a large amount of digital interference signals in the sampled signal, which prevents the achievement of good performance of high-speed AD. At the same time, since the supporting eaves of the PCB board shield are designed as a closed structure, the digital ground and analog ground are connected together in the most distant and complete way, reducing the complexity of ground connections, simplifying circuit layout and maintenance, and making the circuit board easier to design and maintain. This solves the problem that in traditional high-speed PCB board designs, the ground connection between digital circuits and analog circuits can be very complex, leading to complex circuit layout, difficult maintenance, and easy connection errors. At the same time, it avoids completely separated ground connections and reduces digital signal interference through a common ground connection.

[0066] The sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0067] If the integrated units in the above embodiments are implemented as software functional units and sold or used as independent products, they can be stored in the aforementioned computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause one or more computer devices (which may be personal computers, servers, or network devices, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application.

[0068] In the above embodiments of this application, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0069] In the several embodiments provided in this application, it should be understood that the disclosed client can be implemented in other ways. The device embodiments described above are merely illustrative; for example, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces, indirect coupling or communication connection between units or modules, and may be electrical or other forms.

[0070] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0071] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0072] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A PCB circuit, characterized in that, Includes PCB board and PCB board shielding cover, among which, The PCB shielding cover includes: Top cover, and supporting eaves welded under the top cover; The supporting eaves are provided along the outer edge of the top cover, forming a closed structure; The bottom of the support eaves is provided with welding feet, which are used to weld to the digital ground and analog ground on the PCB board; The top cover and / or the support eaves have perforations for heat dissipation of the PCB board; The digital and analog circuits on the PCB are respectively arranged in different areas; Differential signal routing is used internally in the digital circuit, and differential signal routing is used internally in the analog circuit. The digital ground and analog ground on the PCB are respectively located on the diagonal of the PCB; and the ground layer of the PCB has an isolation cutout between the digital ground and the analog ground.

2. The PCB circuit according to claim 1, characterized in that, The height of the support eaves is greater than the height of the tallest component on the PCB board, and also higher than the preset height of the tallest component on the PCB board.

3. The PCB circuit according to claim 1, characterized in that, The support eaves are regular polygons, including: squares, rectangles, regular hexagons, and regular octagons; the solder holes of the digital ground and / or analog ground on the PCB are arranged on the PCB by projecting them onto the PCB when the support eaves are placed horizontally above the PCB.

4. The PCB circuit according to claim 1, characterized in that, Both the top cover and the supporting eaves are made of conductive materials.

5. The PCB circuit according to claim 4, characterized in that, The conductive material includes aluminum or copper.

6. An electrical appliance, characterized in that, include: The PCB circuit according to any one of claims 1 to 5.

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