An EMC multistage filter with an upper and lower combined structure

Abstract

The present invention discloses an EMC multi-stage filter with an up-and-down combined structure, belonging to the technical field of filters. An EMC multi-stage filter with an up-and-down combined structure includes a first filter module and a second filter module. The first filter module includes an upper cover body, a lower housing, and a first capacitor bank. The first capacitor bank is arranged in a combined layout of a "pin" shape and an "F" shape; through the combined layout design of the "pin" shape and the "F" shape of the first capacitor bank in the present invention, the influence of lateral horizontal vibration on the present invention can be reduced; the use of the upper cover body can reduce the influence of longitudinal vertical vibration on the present invention; the split design of the first filter module and the second filter module can meet the differential installation requirements of power-consuming equipment, and can also suppress electromagnetic interference in the circuit, avoid the intrusion of electromagnetic interference in the power supply into the subsequent circuit, and prevent signal distortion, working timing disorder or permanent damage of the power supply components.

Description

Technical Field

[0001] The present invention belongs to the technical field of capacitors, and particularly relates to an EMC multi-stage filter with an up-and-down combined structure. Background Art

[0002] In the electric and electronic control systems of electric vehicles, to suppress electromagnetic interference, an EMC filter (also known as an electromagnetic compatibility filter) has become a core supporting component for the electric and electronic control systems of electric vehicles. Through specific impedance networking design, it can counteract and filter electromagnetic interference in different frequency bands, and at the same time suppress the interference generated by the electronic system itself from conducting to the power supply side, ensuring good electromagnetic compatibility of the entire vehicle system of the electric vehicle.

[0003] Most of the mainstream EMC filters in the existing market adopt an integrated structure design, such as the filter products with the publication numbers of CN116743101A and CN215871186U. Such filter products are made by encapsulating the relevant components of the filter in the housing body with potting glue, and the wiring terminals on the copper busbars are exposed outside the housing body. When the original such filters are installed in vehicles, they cannot simultaneously take into account the performance of resisting vibrations in the horizontal direction and the vertical direction generated by vehicle jolts, making the filter not easily damaged; moreover, the exposed wiring terminals of the original such filters will be deformed due to collision and extrusion, affecting the electrical performance of the wiring terminals; after being used for a period of time, the copper busbar components of such filters sometimes rub against each other, and there is a risk of short circuit between some components. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide an EMC multi-stage filter with an up-and-down combined structure that can overcome or partially solve the above problems.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] An EMC multi-stage filter with an up-and-down combined structure includes a first filter module and a second filter module, and the first filter module and the second filter module are connected by a wire harness.

[0007] The first filter module includes a first capacitor bank, and the first capacitor bank is arranged in a combined layout of a connected "pin" shape and an "F" shape, which can reduce and resist the influence of vibrations in the horizontal direction on the EMC multi-stage filter.

[0008] The second filter module includes a second capacitor bank, and the second capacitor bank is composed of two capacitors arranged in a stacked stepped shape, which can reduce and resist the influence of vibrations in the vertical direction on the EMC multi-stage filter.

[0009] Further, the first capacitor bank is composed of eight capacitors arranged in three rows. The first capacitor bank has a first-row capacitor, a second-row capacitor, and a third-row capacitor. The first-row capacitor is composed of three capacitors arranged at intervals. The second-row capacitor is composed of two capacitors arranged at intervals. Each capacitor in the second-row capacitor is installed at a position directly below the interval area between adjacent capacitors in the first-row capacitor. The second-row capacitor and the first-row capacitor together form a conjoined "pin" shape.

[0010] The third-row capacitor is composed of three capacitors arranged in a determinant pattern, and the three capacitors are arranged in a determinant pattern to form an "F" shape. The three capacitors in the third-row capacitor are all installed at positions directly below the interval area between adjacent capacitors in the second-row capacitor.

[0011] Further, the second capacitor bank is composed of two capacitors arranged in a stacked stepped shape. The second capacitor bank has a first capacitor and a second capacitor. The second capacitor is installed below the first capacitor. The first capacitor and the second capacitor together form a stacked stepped arrangement.

[0012] Further, the first filter module further includes an upper cover, a lower housing, and a first copper busbar assembly. The upper cover is installed above the lower housing. The first capacitor bank is integrated inside the lower housing. One side of the first copper busbar assembly is connected to the first capacitor bank, and the other side has a first wiring terminal that extends outside the lower housing.

[0013] Further, the upper cover has connecting columns, and screw holes are provided inside the connecting columns. The upper cover and the lower housing can be stably connected by bolts installed at the screw holes inside the connecting columns.

[0014] Further, the upper cover also has a clamping member. The clamping member includes an upper clamping member and a lower clamping member. Among them, the upper clamping member is located in the middle upper area of the upper cover, and the lower clamping member is located in the lower area of the upper cover.

[0015] Further, the upper clamping member and the lower clamping member are integrally rectangular, with convex edges on all sides and a concave middle, and a clamping groove is provided at the upper edge.

[0016] The lower clamping member has a through hole for installing the first copper busbar assembly.

[0017] Preferably, the first copper busbar assembly includes a grounding copper busbar, and the first wiring terminal on the grounding copper busbar is provided at the bottom of the upper cover and is connected to the upper cover by bolts.

[0018] Preferably, the upper cover and the lower housing have a barrier member, and the barrier member is provided in the area between the first copper busbar assemblies.

[0019] Further, the second filter module further includes a housing and a second copper busbar assembly. The second capacitor bank is integrated inside the housing. One side of the second copper busbar assembly is connected to the second capacitor bank, and the other side is provided with a second wiring terminal, which extends to the outside of the housing.

[0020] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art:

[0021] 1. Through the design of the "pin" shape and "F" shape combination arrangement of the first capacitor bank in the present invention, when installed on a vehicle, the vibration in the horizontal direction generated by the vehicle jitter can be blocked by the first capacitor bank, thereby weakening the influence of the horizontal vibration on the internal components of the present invention; by using the upper cover body, it can play a buffering and limiting role in the longitudinal vertical direction of the lower housing, and can weaken the influence of the longitudinal vertical vibration generated by the vehicle jitter on the internal components of the present invention; the combined setting of the first capacitor bank and the upper cover body can take into account the vibrations in both the horizontal direction and the longitudinal vertical direction, increasing the stability and service life of the present invention when installed on a vehicle.

[0022] 2. The combined design of the upper cover body and the lower housing can provide stable structural support and an anti-collision and extrusion barrier for the first wiring terminal, avoiding the deformation of the first wiring terminal due to external force collision and extrusion during installation, transportation or use, resulting in a reduction in the anti-interference ability and stability of the filter;

[0023] The setting of the upper cover body can also provide protection for the potting glue layer in the lower housing, preventing the potting glue layer of the lower housing from being damaged by collision and friction with the outside world, thereby losing the protection effect on the first copper busbar assembly and the first capacitor bank inside the lower housing.

[0024] 3. By using the bolts, the first wiring terminal can be stably connected to the upper cover body, further avoiding damage to the first wiring terminal due to external force collision and extrusion during transportation and use; it can also ensure that the first wiring terminal does not shift during the use of the filter, resulting in short circuits caused by the contact between copper busbars;

[0025] At the same time, when the bolts are assembled, they can be mutually adapted to both the first wiring terminal and the upper cover body; when installing the copper busbars, the copper busbars can be directly connected to the first wiring terminal through the bolts, improving the installation efficiency and reducing the installation cost.

[0026] 4. Through the design of the first filter module and the second filter module, the two filtering units are split into two modules, making the spatial layout of the filter more flexible and reducing the operation difficulty during installation in a narrow space; and through the separate setting of the two filter modules, it can be adapted to external devices with different spacings and different specifications, increasing the adaptability of the present invention.

[0027] 5. The recessed center of the mounting bracket can limit the position of the first copper busbar assembly, preventing short circuits caused by friction between the first copper busbar assemblies due to vehicle vibration during vehicle installation. The mounting groove on the mounting bracket allows the upper cover to better fit with other components in the vehicle during installation, ensuring a tight fit and preventing the invention from shifting or falling off during vehicle operation.

[0028] In summary, the present invention, through the combined design of the upper cover and capacitor bank, increases the overall stability and service life of the product; the bolt design ensures strong connection stability between the first terminal and the upper cover, improves installation efficiency, and reduces application costs; the use of first and second filter modules with different arrangements improves the overall vibration resistance of the product and allows for more flexible spatial layout, resulting in better product adaptability; and the snap-fit ​​design enhances the product's stability and safety. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the overall structure of the first filter module in an EMC multi-stage filter with a combined top and bottom structure proposed in this invention, viewed from top to bottom.

[0030] Figure 2 This is a schematic diagram of the overall structure of the first filter module in an EMC multi-stage filter with a combined top and bottom structure proposed in this invention, viewed from bottom to top.

[0031] Figure 3 This is a three-dimensional structural diagram of the first filter module in an EMC multi-stage filter with an upper and lower combined structure proposed in this invention, after removing the upper cover.

[0032] Figure 4 This is a schematic diagram of the arrangement of the first capacitor bank in an EMC multi-stage filter with an upper and lower combined structure proposed in this invention.

[0033] Figure 5 This is a three-dimensional structural diagram of the second filter module in an EMC multi-stage filter with an upper and lower combined structure proposed in this invention.

[0034] Figure 6 This is a three-dimensional structural diagram of the second filter module in an EMC multi-stage filter with an upper and lower combined structure proposed in this invention, with the outer shell removed.

[0035] Figure 7 This is a three-dimensional structural diagram of the upper cover in an EMC multi-stage filter with an upper and lower combined structure proposed in this invention.

[0036] Figure 8Connection circuit diagram when capacitor groups with different capacitance values of the first filter module and the second filter module in an EMC multi-stage filter with an up-and-down combined structure proposed by the present invention are used in series.

[0037] In the figure: 1. First filter module; 11. Upper cover body; 111. Connection column; 112. Upper clamping part; 113. Lower clamping part; 114. Clamping groove; 12. Lower housing; 13. First copper busbar assembly; 131. First terminal; 132. Grounding copper busbar; 14. First capacitor group; 141. First row of capacitors; 142. Second row of capacitors; 143. Third row of capacitors; 2. Second filter module; 21. Outer shell; 22. Second copper busbar assembly; 221. Second terminal; 23. Second capacitor group; 231. First capacitor; 232. Second capacitor; 3. Barrier. Detailed implementation manners

[0038] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0039] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inside", "outside", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0040] Embodiment 1:

[0041] Refer to Figures 1-8 , an EMC multi-stage filter with an up-and-down combined structure, including a first filter module 1 and a second filter module 2. The first filter module 1 and the second filter module 2 are connected by a wire harness.

[0042] The first filter module ① includes a first capacitor group 14. The first capacitor group 14 is arranged in a combined shape of a connected "pin" shape and an "F" shape, which can reduce and resist the influence of vibration in the horizontal direction on the EMC multi-stage filter.

[0043] The second filter module 2 includes a second capacitor group 23. The second capacitor group 23 is composed of capacitors arranged in a stacked stepped shape. The number of capacitors arranged in a stacked stepped shape is an integer greater than or equal to two. This second capacitor group 23 arranged in a stacked stepped shape can reduce and resist the influence of vibration in the vertical direction on the EMC multi-stage filter.

[0044] After the EMC multi-stage filter product of the present invention is installed in a vehicle, when the vehicle is running, the vibration in the longitudinal vertical direction generated by the vehicle jitter can be attenuated by the second capacitor bank 23 arranged in a stacked stepped shape.

[0045] The first capacitor bank 14 is composed of eight capacitors arranged in three rows. The first capacitor bank 14 has a first row of capacitors 141, a second row of capacitors 142, and a third row of capacitors 143. The first row of capacitors 141 is composed of three capacitors arranged at intervals. The second row of capacitors 142 is composed of two capacitors arranged at intervals. The position of each capacitor in the second row of capacitors 142 is directly below the interval area between the adjacent capacitors in the first row of capacitors 141. The second row of capacitors 142 and the first row of capacitors 141 together form a conjoined "pin" shape.

[0046] The third row of capacitors 143 is arranged in a determinant pattern by three capacitors. The three capacitors are arranged in a determinant pattern to form an "F" shape. The three capacitors in the third row of capacitors 143 are all installed directly below the interval area between the adjacent capacitors in the second row of capacitors 142.

[0047] The second capacitor bank 23 is composed of two capacitors. The second capacitor bank 23 has a first capacitor 231 and a second capacitor 232. The second capacitor 232 is installed below the first capacitor 231. The first capacitor 231 and the second capacitor 232 together form a stacked stepped arrangement.

[0048] This stacked stepped arrangement formed by the first capacitor 231 and the second capacitor 232 in the second capacitor bank 23 can effectively resist and attenuate the influence of the vibration in the longitudinal vertical direction generated by the vehicle jitter on the second capacitor bank 23.

[0049] Such as Figure 4 As shown, through the design of the combined arrangement of the "pin" shape and the "F" shape of the first capacitor bank 14 in the present invention, after the EMC multi-stage filter product of the present invention is installed in a vehicle, when the vehicle is running, the vibration in the lateral horizontal direction generated by the vehicle jitter will first be preliminarily attenuated by the first row of capacitors 141. The vibration passing through the interval between two adjacent capacitors in the first row of capacitors 141 will be secondarily attenuated by the second row of capacitors 142 directly below this interval. The vibration passing through the interval between two adjacent capacitors in the second row of capacitors 142 will be thirdly and compoundly attenuated by the third row of capacitors 143 directly below this interval.

[0050] Among them, the third-row capacitor 143 is formed by combining three groups of capacitors into an "F"-shaped combined layout. The "F"-shaped combined layout design of the three groups of capacitors in the third-row capacitor 143 can compoundly attenuate the vibration passing through the interval of the second-row capacitor 142, and this "F"-shaped combined layout design of the third-row capacitor 143 can effectively avoid the coupling resonance of a single-frequency vibration wave.

[0051] These "pin"-shaped and "F"-shaped combined layout designs of the first capacitor bank 14 can effectively attenuate the vibration in the horizontal direction multiple times, eliminate the influence of the vibration in the horizontal direction generated by vehicle jitter on the internal components of the present invention, and improve the ability of the product of the present invention to resist the vibration in the horizontal direction; and the combined layout design of these capacitors in the first capacitor bank 14 can break the periodicity of the electrode spacing, lead length, and capacitance placement angle, realize the electromagnetic coupling path between the distributed capacitors, and also avoid the coupling resonance of a single-frequency vibration wave, and can more effectively resist and eliminate electromagnetic interference in a wide frequency band.

[0052] The first filter module 1 further includes an upper cover body 11, a lower housing 12, and a first copper row assembly 13. The upper cover body 11 is installed above the lower housing 12. The first capacitor bank 14 is integrated inside the lower housing 12. One side of the first copper row assembly 13 is connected to the first capacitor bank 14, and the other side is provided with a first wiring terminal 131, and the first wiring terminal 131 extends to the outside of the lower housing 12.

[0053] The upper cover body 11 is provided with a connecting column 111, and a screw hole is provided inside the connecting column 111. The upper cover body 11 and the lower housing 12 can be stably connected by bolts installed in the screw hole inside the connecting column 111.

[0054]

[0055] The second filter module 2 further includes a housing 21 and a second copper row assembly 22. The second capacitor bank 23 is integrated inside the housing 21. One side of the second copper row assembly 22 is connected to the second capacitor bank 23, and the other side is provided with a second wiring terminal 221, and the second wiring terminal 221 extends to the outside of the housing 21.

[0055] By using the setting of the upper cover body 11, it can play a buffering and limiting role in the longitudinal vertical direction of the lower housing 12, and can weaken the influence of the vibration in the longitudinal vertical direction generated by vehicle jitter on the internal components of the present invention. The combined setting of the first capacitor bank 14 and the upper cover body 11 can take into account the vibrations in the horizontal direction and the longitudinal vertical direction, and increase the stability and service life of the present invention when installed on a vehicle.

[0056] Meanwhile, the combined design of the upper cover 11 and the lower housing 12 connects the first terminal 131 on the first copper busbar assembly 13 to the upper cover 11, which can provide stable structural support and anti-collision and compression barrier for the first terminal 131. This can prevent the first terminal 131 from being deformed due to external force collision or compression during installation, transportation or use, thereby improving the anti-interference performance and overall stability of the filter.

[0057] The lower housing 12 of the present invention is further provided with a potting compound layer. The potting compound layer is used to encapsulate one side of the first capacitor group 14 and the first copper busbar assembly 13 inside the lower housing 12. The upper cover 11 can provide limiting protection for the potting compound layer inside the lower housing 12, preventing the potting compound layer of the lower housing 12 from being damaged by collision and friction with the outside. The design of the potting compound layer can limit protection for the first copper busbar assembly 13 and the first capacitor group 14 inside the lower housing 12.

[0058] The EMC multi-stage filter product of this invention uses a discrete design of the first filter module 1 and the second filter module 2, which splits the filter unit into two modules, making the spatial layout of the filter more flexible and reducing the difficulty of operation when installing in a confined space; and through the discrete design of the two filter modules, it can be adapted to corresponding connected equipment with different spacing and specifications in new energy vehicles, ensuring that the product of this invention has stronger adaptability.

[0059] It should be noted that, as Figure 8 As shown, A and B are the first filter module 1, C is the second filter module 2, and C1~C8 are capacitors in the first capacitor bank 14, where C1, C6, and C8 have a capacitance of 330nF, C2 and C3 have a capacitance of 47nF, and C4, C5, and C7 have a capacitance of 3.3nF; C9 and C10 are capacitors in the second capacitor bank 23, where C9 has a capacitance of 3.3nF and C10 has a capacitance of 330nF. The interconnection structure of these capacitors with different capacitance values ​​allows them to be installed in different areas between different housings and covers, and connected by copper busbar assemblies or wire harnesses, forming a collaborative filter with different capacitance values ​​and different dispersed locations, thus improving the performance of the EMC multi-stage filter of this invention against interference over a wider frequency range.

[0060] When in use, the product of this invention is connected to the corresponding area of ​​the new energy vehicle. The product of this invention utilizes a combination design of large-capacity and small-capacity capacitors to cover and filter out interference waves in a wide frequency range in the relevant systems of the new energy vehicle, making the overall filtering effect of the product of this invention better.

[0061] Example 2:

[0062] Reference Figure 1 and Figure 7 Based on Embodiment 1, the difference is that the upper cover 11 is provided with a connecting post 111, and the connecting post 111 is provided with a screw hole. The upper cover 11 and the lower housing 12 are stably connected by bolts installed in the screw hole of the connecting post 111.

[0063] By using bolts, the first terminal 131 can be securely connected to the upper cover 11, further preventing the first terminal 131 from being damaged by external impact or squeezing during transportation and use; it also ensures that the first terminal will not shift during use, causing short circuits due to contact between copper busbars.

[0064] Meanwhile, during assembly, the bolt can be compatible with both the first terminal block 131 and the upper cover 11; when installing the copper busbar, the copper busbar can be directly connected to the first terminal block 131 via the bolt, improving installation efficiency and reducing installation costs.

[0065] Example 3:

[0066] Reference Figure 1 and Figure 7 Based on Embodiment 2, the difference is that the upper cover 11 is also provided with a mounting component, which includes an upper mounting component 112 and a lower mounting component 113. The upper mounting component 112 is located in the upper middle part of the upper cover 11, and the lower mounting component 113 is located in the lower part of the upper cover 11.

[0067] The upper mounting component 112 and the lower mounting component 113 are rectangular in shape, with raised edges and a recessed center, and a mounting groove 114 is provided at the upper edge.

[0068] The mounting bracket, made of insulating material, has a recessed center that limits the position of the first copper busbar assembly 13, preventing friction between the assemblies 13 due to vehicle vibration during vehicle installation and eliminating the risk of short circuits. The mounting groove 114 on the mounting bracket allows the upper cover 11 to fit seamlessly with other components in the vehicle during installation, preventing the product from shifting or falling off during vehicle operation.

[0069] The lower mounting component 113 is provided with a through hole for inserting the first copper busbar assembly 13: this design can limit the first copper busbar assembly 13, prevent the first copper busbar assembly 13 from shifting or colliding with other components on the vehicle due to vibration during vehicle operation, thereby eliminating the risk of leakage.

[0070] Example 4:

[0071] Reference Figure 2Based on Embodiment 3, the difference is that the first copper busbar assembly 13 includes a grounding copper busbar 132, and the first terminal 131 on the grounding copper busbar 132 is located at the bottom of the upper cover 11 and is connected to the upper cover 11 by bolts.

[0072] By placing the first terminal 131 on the grounding copper busbar 132 at the bottom of the upper cover 11, the upper cover 11 can be directly connected to the vehicle by bolts when the capacitor is installed, so that the grounding copper busbar 132 at the bottom of the upper cover 11 is connected to the vehicle body to achieve grounding. This design eliminates the need for separate wiring of the grounding copper busbar during installation, reducing installation steps. At the same time, this connection method ensures good stability of the connection between the grounding copper busbar 132 and the vehicle body, making it less likely to fall off.

[0073] Example 5:

[0074] Reference Figure 1 and Figure 7 Based on Embodiment 3, the difference is that: the upper cover 11 and the lower shell 12 are provided with a barrier 3, which is located in the area between the first copper busbar assembly 13.

[0075] The first copper busbar assembly 13 also includes a positive copper busbar and a negative copper busbar. The barrier 3 is disposed between the positive copper busbar and the negative copper busbar, and plays a limiting role in the positive copper busbar and the negative copper busbar. The barrier 3 can be a vertical partition or a slanted folded plate. This design can prevent the positive copper busbar and the negative copper busbar from coming into contact with each other and short-circuiting during the use of the filter.

[0076] Example 6:

[0077] The upper cover 11 can also be equipped with a heat sink, with one side of the heat sink connected to the bottom of the upper cover 11 and the other side inserted into the lower housing 12. Since the heat generated by this invention will accumulate inside the lower housing 12, the heat sink design can conduct the heat inside the lower housing 12 to the upper cover 11 and the external environment, preventing heat from accumulating inside the lower housing 12 and causing overheating, which would prevent the first capacitor bank 14 from operating normally.

[0078] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An EMC multi-stage filter of up-down combined structure, comprising a first filter module (1) and a second filter module (2), the first filter module (1) and the second filter module (2) being connected through a wire harness, characterized in that: the first filter module (1) comprises a first capacitor group (14), the first capacitor group (14) being arranged in combination of a connected "product" character and an "F" shape; the second filter module (2) comprises a second capacitor group (23), the second capacitor group (23) being composed of capacitors arranged in a superimposed step shape; the first capacitor group (14) is composed of eight capacitors arranged in three rows, the first capacitor group (14) having a first row of capacitors (141), a second row of capacitors (142) and a third row of capacitors (143), the first row of capacitors (141) being composed of three capacitors arranged in a spaced manner, the second row of capacitors (142) being composed of two capacitors arranged in a spaced manner, each capacitor in the second row of capacitors (142) being arranged at a position directly below the interval between the adjacent capacitors in the first row of capacitors (141), the second row of capacitors (142) and the first row of capacitors (141) together forming a connected "product" character; the third row of capacitors (143) is composed of three capacitors arranged in a row-column manner, the three capacitors being arranged in an "F" shape, the three capacitors in the third row of capacitors (143) being arranged at positions directly below the intervals between the adjacent capacitors in the second row of capacitors (142); the second capacitor group (23) is composed of two capacitors arranged in a superimposed step shape, the second capacitor group (23) having a first capacitor (231) and a second capacitor (232), the second capacitor (232) being arranged below the first capacitor (231), the first capacitor (231) and the second capacitor (232) together forming a superimposed step arrangement. The first filter module (1) further comprises an upper cover body (11), a lower shell (12) and a first copper bar assembly (13), the upper cover body (11) being arranged above the lower shell (12), the first capacitor group (14) being integrated inside the lower shell (12), the first copper bar assembly (13) being connected to one side of the first capacitor group (14) and having a first wiring terminal (131) on the other side, the first wiring terminal (131) extending to the outside of the lower shell (12). The upper cover body (11) is provided with a connecting column (111) having a screw hole therein, the upper cover body (11) and the lower shell (12) being stably connected through a bolt arranged in the screw hole of the connecting column (111). The upper cover body (11) is further provided with a clamping piece, the clamping piece comprising an upper clamping piece (112) and a lower clamping piece (113), wherein the upper clamping piece (112) is located at an upper middle position of the upper cover body (11), and the lower clamping piece (113) is located below the upper cover body (11). The upper clamping piece (112) and the lower clamping piece (113) are in the shape of a rectangle as a whole, with a protrusion around and a recess in the middle, and a clamping groove (114) being provided at the upper edge. ​ 2. The EMC multi-stage filter of claim 1, wherein, ​ 3. The EMC multi-stage filter of claim 2, wherein, ​ 4. The EMC multi-stage filter of claim 3, wherein, ​ 5. The EMC multi-stage filter of claim 4, wherein, ​ The lower clamping piece (113) is provided with a through hole for clamping the first copper bar assembly (13).

6. The EMC multi-stage filter of claim 2, wherein, The first copper bar assembly (13) comprises a grounding copper bar (132), and a first connecting terminal (131) on the grounding copper bar (132) is arranged at the bottom of the upper cover body (11) and connected with the upper cover body (11) through a bolt.

7. The EMC multi-stage filter of claim 6, wherein, The upper cover body (11) and the lower shell (12) are provided with a barrier (3), the first copper bar assembly (13) comprises a positive copper bar and a negative copper bar, and the barrier (3) is arranged between the positive copper bar and the negative copper bar.

8. The EMC multi-stage filter of claim 1, wherein, The second filter module (2) further comprises a shell (21) and a second copper bar assembly (22), the second capacitor set (23) is integrated in the shell (21), one side of the second copper bar assembly (22) is connected with the second capacitor set (23), the other side is provided with a second connecting terminal (221), and the second connecting terminal (221) extends to the outside of the shell (21).

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