A power system electromagnetic compatibility port protection device

Abstract

The utility model belongs to signal power supply system equipment electromagnetic compatibility protection technical field relates to a power supply system electromagnetic compatibility port protection device. Including shielding shell, top cover, incoming line mouth closing plate, shielding connector, shielding connector mounting plate, surge protection device, filter and output terminal, shielding shell and top cover mutually cooperate constitute closed cavity, the cavity inside sets surge protection device, filter in proper order, shielding connector is fixed in the cavity lateral wall through mounting plate, and the incoming line mouth closing plate is located in the incoming line side of cavity, and the output terminal is located in the output side of cavity. The utility model device can be used for signal power supply system power supply conduction annoyance, radiation emission overproof improvement, surge protection.

Description

Technical Field

[0001] This utility model belongs to the field of electromagnetic compatibility protection technology for signal power supply system equipment, and relates to an electromagnetic compatibility port protection device for power supply systems, which can be used to improve the conduction interference and radiated emission exceeding the standard in signal power supply systems, and provide surge protection. Background Technology

[0002] With the rapid development of power electronics technology, switching power supplies have become the mainstream power supply solution. However, their inherent high-frequency switching characteristics also bring severe electromagnetic compatibility (EMC) challenges. The high di / dt and dv / dt generated by MOSFETs and diodes during nanosecond-level fast switching processes can induce broadband noise, often covering a frequency range of 30MHz to 1GHz. This interference can affect peripheral devices through conduction and radiation, and may also backfire on the power supply's own critical circuitry. Optocouplers and control ICs in the feedback loop are particularly sensitive and are prone to abnormal output voltage or malfunctioning protection due to interference. High-frequency radiated noise can also cause system-level failures such as MCU program crashes.

[0003] In the context of a globalized market, electromagnetic compatibility (EMC) compliance has become a fundamental requirement for product market access. Standards such as the EU CE certification, the US FCC Part 15B, and China's GB9254 all set strict limits on conducted and radiated emissions. Real-world examples show that power adapters that fail FCC certification may not only be removed from platforms like Amazon but also face hefty fines. More seriously, EMC issues directly threaten equipment reliability—electrical fast transients (EFTs) in industrial environments can trigger malfunctions in power protection circuits, while excessive conducted emissions can pollute the power grid, interfering with the normal operation of sensitive instruments like oscilloscopes on the same grid, and radiated noise can degrade the quality of wireless communications such as Bluetooth and GPS.

[0004] From a life-cycle cost perspective, EMC design has a significant economic leverage effect. Although EMC investment in the initial design phase accounts for less than 5% of the total cost, the cost of later rectification can soar to 30%, with typical measures including adding shielding covers and replacing filters. More importantly, equipment failures in the field due to insufficient immunity can result in repair costs of tens of thousands of yuan per instance. Taking surge protection as an example, this critical design for transient interferences such as lightning strikes and large load switching directly relates to the equipment's survivability in harsh power grid environments.

[0005] Current EMC protection devices on the market often suffer from limited functionality and improper application. Common failure cases include: filters failing due to coupling caused by installation too close to the switching power supply; surge suppressors failing due to placement too far from the filter leading to secondary noise coupling through air gaps; and electromagnetic leakage at the inlet and connector causing excessive radiation. These phenomena clearly demonstrate that EMC protection is not simply a matter of piling up components, but requires system-level collaborative design. A reasonable layout architecture, precise impedance matching, and strict shielding isolation together form the cornerstone of stable operation of switching power supplies in complex electromagnetic environments. Utility Model Content

[0006] The purpose of this invention is to solve the problems in the prior art and provide an electromagnetic compatibility port protection device for power supply systems.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: This utility model provides an electromagnetic compatibility port protection device for a power system, including a shielding shell, a top cover, an inlet sealing plate, a shielding connector, a shielding connector mounting plate, a surge protector, a filter, and an output terminal; the shielding shell and the top cover cooperate to form a closed cavity; the surge protector and the filter are arranged sequentially inside the cavity; the shielding connector is fixed to the side wall of the cavity by the mounting plate, the inlet sealing plate is located on the inlet side of the cavity; and the output terminal is located on the output side of the cavity.

[0008] Preferably, the outer surfaces of the shielding shell and the top cover are made of nickel-plated brass.

[0009] Preferably, both the inlet sealing plate and the shielded connector mounting plate are made of nickel-plated brass.

[0010] Preferably, the shielded connector adopts a brass-plated nickel-phosphorus bronze spring EMC cable connector structure.

[0011] Preferably, the surge protector adopts a stud frame structure, and its varistor and gas discharge tube are connected through O-type cold-pressed terminals.

[0012] Preferably, the filter is a third-order filter, including a first-order filter composed of an X capacitor and a differential-mode inductor, and second-order and third-order filters composed of an X capacitor, a Y capacitor, and a common-mode inductor.

[0013] Preferably, the X capacitor, Y capacitor, dummy load resistor, common-mode inductor, and differential-mode inductor inside the filter are all connected via O-type cold-pressed terminals.

[0014] Preferably, the output terminal adopts a compact screw terminal structure.

[0015] Preferably, the shielded connector mounting plate has lifting lugs on its side.

[0016] Preferably, the bottom of the shielding shell is provided with mounting feet.

[0017] Compared with the prior art, the present invention has the following beneficial effects: The shielding shell and top cover form a closed cavity to achieve overall electromagnetic shielding. Surge protectors arranged sequentially inside provide transient overvoltage protection, and filters suppress conducted interference. The shielding connector and mounting plate work together to ensure reliable cable shielding. Replaceable inlet end plates allow for flexible adaptation to different cable entry methods. Output terminals ensure reliable output connections. All components work together to form a complete electromagnetic compatibility protection system, effectively improving the power supply system's operational stability in complex electromagnetic environments. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the device structure of this utility model; Figure 2 for Figure 1 Sectional view at point A in the middle; Figure 3 This is a schematic diagram of the installation of the lower inlet line of the device of this utility model; Figure 4 This is a schematic diagram of the side-entry line installation of the device of this utility model.

[0020] The components include: 1. Shielding shell; 2. Top cover; 3. Inlet sealing plate; 4. Shielding connector; 5. Shielding connector mounting plate; 6. Surge protector; 7. Filter; 8. Output terminal; 9. Lifting lug; 10. Mounting feet. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0023] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0024] In the description of the embodiments of this utility model, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use, they are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the utility model. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0025] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0026] In the description of the embodiments of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0027] The present invention will now be described in further detail with reference to the accompanying drawings: This utility model provides an electromagnetic compatibility port protection device for a power supply system, such as... Figures 1-2As shown, it includes a shielding shell 1, a top cover 2, an inlet sealing plate 3, a shielding connector 4, a shielding connector mounting plate 5, a surge protector 6, a filter 7, and an output terminal 8; the shielding shell 1 and the top cover 2 form a closed cavity, and the surge protector 6 and the filter 7 are arranged sequentially inside; the shielding connector 4 is fixed to the side wall of the cavity by the mounting plate 5, and the inlet sealing plate 3 can be replaced and installed on the inlet side of the cavity; the output terminal 8 is located on the output side of the cavity.

[0028] The electromagnetic compatibility port protection device for power systems provided by this utility model achieves overall electromagnetic shielding through a closed cavity formed by a shielding shell 1 and a top cover 2. The surge protector 6 arranged sequentially inside can directly suppress the instantaneous overvoltage at the input terminal, and the filter 7 effectively filters out conducted interference. The shielded connector 4 is fixed to the side wall of the cavity through the shielded connector mounting plate 5 to ensure the continuity of shielding at the cable connection. The replaceable input port sealing plate 3 allows the device to flexibly adapt to different input methods. The setting of the output terminal 8 not only ensures the reliability of the output connection, but also maintains the integrity of the cavity shielding. The coordinated work of all components makes the device's overall performance in electromagnetic shielding, surge protection, and filtering improved.

[0029] The outer surfaces of the shielding shell 1 and the top cover 2 are made of nickel-plated brass; the inlet sealing plate 3 and the shielding connector mounting plate 5 are also made of nickel-plated brass. This invention uses nickel-plated brass to manufacture the shielding shell 1, top cover 2, inlet sealing plate 3, and shielding connector mounting plate 5, fully utilizing the excellent conductivity of brass to ensure that the entire protective device forms a continuous and complete electromagnetic shield, effectively blocking electromagnetic wave leakage and intrusion. The nickel plating treatment not only enhances the corrosion resistance of each component and extends the service life of the device, but also maintains good conductive contact characteristics, making the electrical connection between components more reliable, thereby significantly improving the long-term stability and protective effect of the device in complex electromagnetic environments.

[0030] The shielded connector 4 adopts a brass-plated nickel-phosphorus copper spring EMC cable connector structure. The brass base ensures excellent conductivity, and the nickel plating on the surface enhances corrosion resistance, enabling the connector to maintain a stable electrical connection over a long period of time. The special design of the phosphorus copper spring provides reliable elastic contact pressure, ensuring a tight electrical connection between the cable shielding layer and the connector housing, effectively preventing high-frequency electromagnetic waves from leaking through the connection gaps. This achieves complete electromagnetic shielding at the cable entry and exit points, significantly improving the electromagnetic compatibility performance of the entire protective device.

[0031] The shielded connector mounting plate 5 and the inlet sealing plate 3 adopt an interchangeable mounting structure. The shielded connector mounting plate 5 not only provides reliable fixed support for the shielded connector 4, but also allows the entire protective device to quickly switch between two installation modes, namely bottom entry and side entry, according to the actual needs of the site. This enables the protective device to maintain the best electromagnetic compatibility protection effect in various complex engineering environments, significantly enhancing the practicality and engineering applicability of the product.

[0032] The surge protector 6 adopts a stud frame structure, and its varistor and gas discharge tube are connected through O-type cold-pressed terminals. The O-type cold-pressed terminal connection not only provides reliable electrical contact, but also facilitates quick replacement of protective components during later maintenance, enabling the protection device to flexibly adjust the surge protection level according to different application scenarios, while maintaining excellent overvoltage discharge performance.

[0033] This utility model's third-order filter 7 achieves more comprehensive noise suppression through a multi-stage filtering architecture. The first-order filter, composed of an X-capacitor and a differential-mode inductor, effectively filters out differential-mode interference. The second- and third-order filters, through a combination of X-capacitors, Y-capacitors, and a common-mode inductor, simultaneously suppress both common-mode and differential-mode noise, forming multiple filtering protections over a wide frequency range. This progressive filtering structure significantly improves the device's ability to suppress conducted interference, ensuring stable operation of the power supply system in complex electromagnetic environments. Simultaneously, the modular design facilitates adjustment of filtering parameters according to actual needs, achieving optimal electromagnetic compatibility performance.

[0034] The X capacitor, Y capacitor, dummy load resistor, common mode inductor, and differential mode inductor inside the filter 7 are all connected through O-type cold-press terminals. This not only ensures the reliability of the electrical connection between the X capacitor, Y capacitor, dummy load resistor, and common mode / differential mode inductor, but also greatly improves the ease of maintenance of the device.

[0035] The output terminal 8 adopts a compact screw terminal structure. The screw crimping method ensures a firm contact of the output line, effectively reducing contact resistance and potential electromagnetic leakage risks. At the same time, this structure takes into account both installation convenience and maintenance convenience, enabling the protective device to quickly complete the connection and maintenance of the output line while maintaining the overall shielding integrity.

[0036] The shielded connector mounting plate 5 is equipped with lifting lugs 9, which can support both conventional planar fixed installation and lateral hanging installation, significantly improving the deployment adaptability of the equipment in different spatial environments.

[0037] The shielding shell 1 is equipped with mounting feet 10 at its bottom. By raising the distance between the main body of the device and the mounting surface, it ensures the stability of the equipment during installation, provides reasonable space for bottom cable routing, and enhances air circulation between the shell and the mounting surface, effectively preventing moisture accumulation. Furthermore, it enables compact parallel installation in multi-power supply systems, effectively saving installation space.

[0038] In summary, this utility model achieves multiple protection effects through an optimized electromagnetic compatibility port protection device: The use of a high-integrity shielded interface ensures the continuity of the cabinet shielding, completely eliminating electromagnetic leakage dead zones and significantly improving the system's electromagnetic radiation interference suppression capability and anti-interference performance; the optimized layout allows the power line to be immediately connected to the high-power surge protector 6 after passing through the shielded interface, achieving rapid surge voltage suppression through the shortest path and effectively protecting the power supply equipment from transient overvoltage damage; the bottom plate / side plate mounting method ensures a reliable connection between the filter 7 housing and the equipment housing, forming an effective signal blocking and reflection mechanism at the interference source inlet and outlet, and preventing spatial coupling through physical isolation of input / output lines, ensuring that filtering performance is not affected; simultaneously, the inclusion of an openable high-conductivity housing and an open filter structure facilitates rapid on-site adjustment of electrical parameters, providing a flexible and convenient technical means for precise optimization of electromagnetic compatibility performance, and overall achieving efficient and reliable electromagnetic compatibility protection.

[0039] For example, in terms of installation, the device supports two installation modes: bottom entry and side entry. Figure 3 As shown, during bottom-entry installation, holes need to be drilled and tapped at the corresponding positions on the cabinet according to the mounting holes on the bottom of the device, and a shielded connector through-hole needs to be opened at the inlet. The shielded connector 4 is then fixed to the bottom inlet using the shielded connector mounting plate 5, and the inlet sealing plate 3 is installed on the inner side. Figure 4 As shown, for side-entry installation, it needs to be fixed by the lifting lug 9, and the shielded connector 4 should be installed at the side inlet. The inlet cover 3 should be moved to the inner bottom surface. During wiring, the top cover 2 should be opened first and the shielded connector clamping cap should be loosened. The prepared shielded cable should be reliably connected to the surge protector 6, and then the clamping cap should be tightened. Finally, the output terminal 8 should be connected to complete the installation.

[0040] During debugging, the parameters of filter 7 can be replaced and adjusted by opening the top cover 2 to optimize the conduction performance of a specific frequency band. At the same time, the protection level can be adjusted by replacing surge protector 6.

[0041] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A power system electromagnetic compatibility port protection device, characterized in that, It includes a shielding shell (1), a top cover (2), an inlet sealing plate (3), a shielding connector (4), a shielding connector mounting plate (5), a surge protector (6), a filter (7), and an output terminal (8); the shielding shell (1) and the top cover (2) cooperate to form a closed cavity; the surge protector (6) and the filter (7) are arranged in sequence inside the cavity; the shielding connector (4) is fixed to the side wall of the cavity by the mounting plate (5), the inlet sealing plate (3) is located on the inlet side of the cavity; the output terminal (8) is located on the output side of the cavity.

2. The power system electromagnetic compatibility port protection device according to claim 1, characterized in that, The outer surfaces of the shielding shell (1) and the top cover (2) are made of nickel-plated brass.

3. The power system electromagnetic compatibility port protection device according to claim 1, characterized in that, The inlet sealing plate (3) and the shielded connector mounting plate (5) are both made of nickel-plated brass.

4. The power system electromagnetic compatibility port protection device according to claim 1, characterized in that, The shielded connector (4) adopts a brass-plated nickel-phosphorus copper spring EMC cable joint structure.

5. The power system electromagnetic compatibility port protection device according to claim 1, characterized in that, The surge protector (6) adopts a stud frame structure, and its varistor and gas discharge tube are connected through O-type cold-pressed terminals.

6. The power system electromagnetic compatibility port protection device according to claim 1, characterized in that, The filter (7) is a third-order filter, including a first-order filter composed of an X capacitor and a differential-mode inductor, and second-order and third-order filters composed of an X capacitor, a Y capacitor and a common-mode inductor.

7. The power system electromagnetic compatibility port protection device according to claim 6, characterized in that, The X capacitor, Y capacitor, dummy load resistor, common mode inductor and differential mode inductor inside the filter (7) are all connected through O-type cold-pressed terminals.

8. The power system electromagnetic compatibility port protection device according to claim 1, characterized in that, The output terminal (8) adopts a compact screw terminal structure.

9. The power system electromagnetic compatibility port protection device according to claim 1, characterized in that, The shielded connector mounting plate (5) is provided with a lifting lug (9) on its side.

10. The power system electromagnetic compatibility port protection device according to claim 1, characterized in that, The bottom of the shielding shell (1) is provided with mounting feet (10).

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