Filtering device for enhancing common-mode anti-interference capability
By employing an insulating mounting base and a multi-turn spiral coil design in the inverter filter device, combined with an E-type magnetic body assembly, the problems of large size and high cost of existing filter devices are solved, achieving efficient common-mode interference immunity and flexible electromagnetic compatibility applicability in a small volume.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANGHAI AUTO EDRIVE CO LTD
- Filing Date
- 2025-05-20
- Publication Date
- 2026-04-28
AI Technical Summary
Existing common-mode interference suppression filters for inverters are large in size, expensive, and have poor filtering performance, making it difficult to meet the electromagnetic compatibility requirements of CLASS 5 and above.
An insulating mounting base is directly wrapped around the outside of the first and second coil bodies, and an insulating inner cavity matching the shape of the magnetic body is provided on the mounting base. The magnetic body is installed in the insulating inner cavity. Combined with the multi-turn spiral coil design and the E-type magnetic body combination, the contact between the magnetic body and the coil is reduced, and the common-mode anti-interference capability is enhanced.
It improves common-mode interference immunity in a smaller volume, reduces material costs and inverter size, enhances the integration and reliability of the filter device, has a wide range of applications, and meets different electromagnetic compatibility requirements.
Smart Images
Figure CN224177205U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of electric drive, and in particular to a filter device that enhances common-mode anti-interference capability. Background Technology
[0002] With continuous technological upgrades and innovations, new energy vehicles are becoming increasingly competitive and favored by consumers both domestically and internationally. As a core component of the powertrain system of new energy vehicles, the technical requirements for inverters are becoming increasingly stringent. Previously, the electromagnetic compatibility (EMC) requirements for inverters in vehicles were generally only CLASS 3. However, as vehicles become more intelligent and the integration of internal electronic components increases, various signal interference issues are becoming more prominent. Currently, some high-performance models on the market already require inverter EMC levels of CLASS 5 and above. With the further development and maturation of artificial intelligence and autonomous driving technologies in automobiles, the EMC requirements for inverters will undoubtedly become even more stringent.
[0003] However, the common-mode interference suppression filtering devices on conventional inverters in the market are generally second-order or fourth-order topologies, namely CL (capacitor-inductor) or CLCL (capacitor-inductor-capacitor-inductor). Structurally, they are composed of a magnetic body, a Y capacitor, and a current-carrying copper busbar. The copper busbar passes directly through the magnetic body, which can only meet electromagnetic compatibility requirements within CLASS 3. For electromagnetic compatibility requirements of CLASS 5 and above, current solutions can only try to use a higher-order filtering topology, superimposing the order of inductors and capacitors, that is, increasing the number of sets of magnetic bodies and Y capacitors in the structural layout. This makes the filtering device very large, which not only occupies too much internal space of the controller and increases material costs, but also the filtering effect is not satisfactory. Utility Model Content
[0004] The purpose of this invention is to overcome the shortcomings of the existing technology, which adds magnetic materials and Y capacitors to the structure, making the filter device very large, occupying too much internal space of the controller, increasing material costs, and having a mediocre filtering effect. This invention provides a filter device that enhances common-mode anti-interference capability.
[0005] The objective of this utility model can be achieved through the following technical solutions:
[0006] A filtering device for enhancing common-mode interference immunity includes a magnetic body, a mounting base, a first coil body, and a second coil body. The first and second coil bodies are fixed on the mounting base. The magnetic body passes through the first and second coil bodies and is mounted on the mounting base. The mounting base is made of insulating material and fits snugly around the outside of the first and second coil bodies. The mounting base has an insulating inner cavity that matches the shape of the magnetic body. The magnetic body is installed in the insulating inner cavity and wraps around the outside of the first and second coil bodies.
[0007] Preferably, both the first coil body and the second coil body are flat wire structures, both the first coil body and the second coil body are multi-turn spiral coils, and the coils of the first coil body and the second coil body are coaxially arranged.
[0008] Preferably, the first coil body and the second coil body have the same number of turns.
[0009] Preferably, the first coil body includes a first flat wire input segment and a first flat wire output segment located on the same straight line, the first flat wire input segment bends toward the side closer to the first flat wire output segment, and the first flat wire input segment and the first flat wire output segment are located in the same plane; the second coil body includes a second flat wire input segment and a second flat wire output segment located on the same straight line, the second flat wire output segment bends toward the side closer to the second flat wire input segment, and the second flat wire input segment and the second flat wire output segment are located in the same plane.
[0010] Preferably, the first coil body and the second coil body are stacked and mounted, the first flat wire input segment, the first flat wire output segment, the second flat wire input segment and the second flat wire output segment are located in the same plane, the first flat wire input segment and the second flat wire input segment are parallel to each other and located at the same end of the mounting base, and the first flat wire output segment and the second flat wire output segment are parallel to each other and located at the other end of the mounting base.
[0011] Preferably, the width and thickness of the winding flat wire of the first coil body and the second coil body are the same, and the radial width of the cross-section of the first coil body along the coil axis is greater than the axial height.
[0012] Preferably, the mounting base has an equal thickness covering the outer sides of the first coil body and the second coil body.
[0013] Preferably, the input and output ends of the first coil body and the input and output ends of the second coil body are all provided with flat connecting end faces formed by cold heading, and bolt holes are provided on the connecting end faces.
[0014] Preferably, the device further includes an elastic buckle plate. The magnetic body includes a type I magnetic body and an E-type magnetic body. The insulating inner cavity is provided with an insulating magnetic inner cavity that matches the shape of the E-type magnetic body. The E-type magnetic body is inserted into the insulating magnetic inner cavity, and the type I magnetic body is installed at the open end of the E-type magnetic body. A snap-fit groove is provided on the side wall of the insulating inner cavity near the type I magnetic body. The elastic buckle plate is installed in the snap-fit groove and abuts against the end face of the type I magnetic body away from the E-type magnetic body.
[0015] Preferably, the device further includes a first Y capacitor, a second Y capacitor, a first grounding plate, a third Y capacitor, a second grounding plate, and a fourth capacitor;
[0016] The first grounding plate and the second grounding plate are fixed at both ends of the bottom of the mounting base. The first Y capacitor and the second Y capacitor are placed on the bottom of the mounting base near the first grounding plate, with one pole connected in parallel with the first grounding plate and the other pole connected in parallel with the first coil body.
[0017] The third Y capacitor and the fourth capacitor are placed on the bottom of the mounting base near the second grounding plate, with one pole connected in parallel with the second grounding plate and the other pole connected in parallel with the second coil body.
[0018] Compared with the prior art, the present invention has the following advantages:
[0019] (1) In this solution, the mounting base, based on insulating material, is directly liquefied and bonded to the outside of the first and second coil bodies, achieving insulation treatment for both coil bodies. An insulating cavity matching the shape of the magnetic body is pre-set at the corresponding position on the mounting base. Installing the magnetic body within the insulating cavity allows the coil to wind around it, increasing impedance and inductance, thereby enhancing common-mode interference immunity. Compared to conventional filter devices that apply an insulating layer to the outside of the coil, assemble the magnetic body, and then fix it to the base, this solution uses the special structure of the mounting base to insulate and separate the coil and magnetic body, simplifying the structure and improving safety and reliability while reducing the size of the filter device. Enhanced common-mode interference immunity within a smaller volume, high integration reducing the inverter's size, and effectively lowering the overall cost.
[0020] (2) In this design, the input and output connection faces of the first and second coil bodies are located on opposite sides of the magnetic body. This staggered arrangement improves space utilization and helps reduce the size of the filtering device. The connection faces of the coils all adopt a flat planar design, eliminating the need for additional connection plates, thus reducing the connection risks associated with the number of components, lowering contact resistance losses, and improving the safety and reliability of the coils. Furthermore, the multi-turn spiral-wound copper busbar structure design achieves the corresponding common-mode interference suppression capability without the need for multiple magnetic bodies and multi-order Y capacitors, significantly reducing the size and material cost of the common-mode interference suppression device.
[0021] (3) In this scheme, the magnetic body is composed of a combination of E-type magnetic body and a type I magnetic body, and the coils of the first coil body and the second coil body are wrapped in it. The upper, lower and left and right sides of the wrapped magnetic body are arranged opposite each other. Combined with the spiral circular shape of the coil body, the gap between the magnetic body and the coil body can be reduced, and the amount of magnetic core can be reduced by half, thereby further reducing the volume of the filter device.
[0022] (4) In this scheme, the filter device can be extended to a series of corresponding filter structures by adjusting the number of turns of the copper busbar of the spiral coil or the wire diameter of the copper busbar, so as to achieve different levels of electromagnetic compatibility requirements. It is flexible in adjustment and has good filtering effect, with high scalability and wide applicability. Attached Figure Description
[0023] Figure 1 This is a schematic diagram of the structure of the filtering device of this utility model;
[0024] Figure 2 Exploded view of the filtering device provided by this utility model;
[0025] Figure 3 A schematic diagram of the structure of the first and second coil bodies of the multi-turn copper busbar;
[0026] Figure 4 This is a schematic diagram of the structure of a magnetic material;
[0027] Figure 5 This is a first-person view structural diagram of the mounting bracket;
[0028] Figure 6 This is a structural schematic diagram of the mounting base from a second perspective;
[0029] Figure 7 A schematic diagram showing the elastic buckle plate fastened into the buckle groove on the bottom surface of the mounting base;
[0030] In the figure: 1. Type I magnetic body, 2. Type E magnetic body, 3. First coil body, 4. Second coil body, 5. Mounting base, 6. First Y capacitor, 7. Second Y capacitor, 8. First grounding plate, 9. Elastic buckle plate, 10. Third Y capacitor, 11. Second grounding plate, 12. Fourth capacitor; 5-1. Snap-on slot, 5-2. Insulating magnetic body cavity. Detailed Implementation
[0031] 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.
[0032] 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.
[0033] 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.
[0034] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., 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 this 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. Therefore, they should not be construed as limitations on this utility model.
[0035] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.
[0036] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," not that the structure must be completely horizontal, but can be slightly tilted.
[0037] Example 1
[0038] like Figure 1 and Figure 2 As shown, this embodiment provides a filtering device to enhance common-mode anti-interference capability, including a magnetic body, a mounting base 5, a first coil body and a second coil body. The first coil body and the second coil body are fixed on the mounting base 5. The magnetic body passes through the first coil body and the second coil body and is mounted on the mounting base 5. The mounting base 5 is made of insulating material and fits snugly to cover the outside of the first coil body and the second coil body. The mounting base 5 is provided with an insulating inner cavity that matches the shape of the magnetic body. The magnetic body is installed in the insulating inner cavity and wraps around the outside of the first coil body and the second coil body.
[0039] This device uses an insulating mounting base 5 to directly liquefy and bond the first and second coil bodies to their outer surfaces, achieving insulation. An insulating cavity, matching the shape of the magnetic material, is pre-set at a corresponding position on the mounting base. Installing the magnetic material within this cavity allows the coil to wind around it, increasing impedance and inductance, thereby enhancing common-mode interference immunity. Compared to conventional filter devices that apply an insulating layer to the outside of the coil, assemble the magnetic material, and then fix it to a base, this solution uses the special structure of the mounting base 5 to insulate and separate the coil and magnetic material, simplifying the structure, improving safety and reliability, and reducing the size of the filter device. Enhanced common-mode interference immunity within a smaller size, high integration reducing inverter size, and effectively lowering overall cost.
[0040] In a preferred embodiment, both the first coil body and the second coil body are flat wire structures, both are multi-turn spiral coils, and the coils of the first coil body and the second coil body are coaxially arranged.
[0041] In this embodiment, the first coil body and the second coil body have the same number of turns. By adjusting the number of turns or the wire diameter of the copper busbar of the spiral coil, the filtering device can expand into a series of corresponding filtering structures to achieve different levels of electromagnetic compatibility requirements. It is flexible in adjustment, has good filtering effect, high scalability, and a wide range of applications.
[0042] In this embodiment, the first coil body includes a first flat wire input segment and a first flat wire output segment located on the same straight line. The first flat wire input segment is bent towards the side closer to the first flat wire output segment, and the first flat wire input segment and the first flat wire output segment are located in the same plane. The second coil body includes a second flat wire input segment and a second flat wire output segment located on the same straight line. The second flat wire output segment is bent towards the side closer to the second flat wire input segment, and the second flat wire input segment and the second flat wire output segment are located in the same plane.
[0043] Furthermore, the first coil body and the second coil body are stacked and installed. The first flat wire input segment, the first flat wire output segment, the second flat wire input segment and the second flat wire output segment are located in the same plane. The first flat wire input segment and the second flat wire input segment are parallel to each other and located at the same end of the mounting base 5. The first flat wire output segment and the second flat wire output segment are parallel to each other and located at the other end of the mounting base 5.
[0044] Furthermore, the width and thickness of the winding flat wire of the first coil body and the second coil body are the same, and the radial width of the cross-section of the first coil body along the coil axis is greater than the axial height.
[0045] The input and output connection faces of the first and second coils are located on opposite sides of the magnetic body. This staggered arrangement improves space utilization, thereby helping to reduce the size of the filter device. Furthermore, the multi-turn spiral-wound copper busbar structure design eliminates the need for multiple magnetic bodies and multi-order Y capacitors to achieve the corresponding common-mode interference suppression capability, significantly reducing the size and material cost of the common-mode interference suppression device.
[0046] In this embodiment, the mounting base 5 has an equal thickness covering the outer sides of the first coil body and the second coil body.
[0047] Preferred implementation methods, such as Figure 3 As shown, the input and output ends of the first coil body and the second coil body are all provided with flat connecting end faces formed by cold heading, and bolt holes are provided on the connecting end faces. The connecting end faces of the coils all adopt a flat planar design, which eliminates the need for additional connecting plates, thereby reducing the connection risks associated with the number of components, reducing the contact resistance loss of the components, and improving the safety and reliability of the coils.
[0048] Preferred implementation methods, such as Figure 6 and 7As shown, the device also includes an elastic buckle plate 9. The magnetic body includes a type I magnetic body 1 and an E-type magnetic body 2. An insulating inner cavity 5-2 is provided inside the insulating inner cavity, which matches the shape of the E-type magnetic body 2. The E-type magnetic body 2 is inserted into the insulating inner cavity 5-2. The type I magnetic body 1 is installed at the open end of the E-type magnetic body 2. A buckle groove 5-1 is provided on the side wall of the insulating inner cavity near the end of the type I magnetic body 1. The elastic buckle plate 9 is installed in the buckle groove 5-1 and abuts against the end face of the type I magnetic body 1 away from the E-type magnetic body 2.
[0049] In this embodiment, as Figure 2 As shown, the device also includes a first Y capacitor 6, a second Y capacitor 7, a first grounding plate 8, a third Y capacitor 10, a second grounding plate 11, and a fourth capacitor 12.
[0050] The first grounding plate 8 and the second grounding plate 11 are fixed at both ends of the bottom of the mounting base 5. The first Y capacitor 6 and the second Y capacitor 7 are placed on the bottom of the mounting base 5 near the first grounding plate 8, with one pole connected in parallel with the first grounding plate 8 and the other pole connected in parallel with the first coil body. The third Y capacitor 10 and the fourth capacitor 12 are placed on the bottom of the mounting base 5 near the second grounding plate 11, with one pole connected in parallel with the second grounding plate 11 and the other pole connected in parallel with the second coil body. The magnetic body is composed of a combination of E-type magnetic body and a type I magnetic body, and the coils of the first coil body and the second coil body are wrapped within it. The top, bottom, left, and right sides of the wrapped magnetic body are arranged opposite each other. Combined with the spiral circular winding shape of the coil body, the gap between the magnetic body and the coil body can be reduced, which can reduce the amount of magnetic core by half, thereby further reducing the size of the filter device.
[0051] In conjunction with the preferred embodiments described above, this embodiment also provides a more specific filtering device to enhance common-mode interference immunity, such as... Figure 1 and Figure 2 As shown, it includes a type I magnetic body 1, a type E magnetic body 2, a first coil body 3, a second coil body 4, a mounting base 5, a first Y capacitor 6, a second Y capacitor 7, a first grounding plate 8, an elastic buckle 9, a third Y capacitor 10, a second grounding plate 11, and a fourth capacitor 12.
[0052] Mounting base 5 is made of high-temperature resistant thermoplastic insulating material; the first coil body, second coil body, first grounding plate, and second grounding plate are liquefied from the mounting base and injection molded into one piece. Both E-type and I-type magnetic bodies are mounted on the mounting base. An elastic pressure plate is connected to the base. After the mounting base is liquefied at high temperature, an insulating cavity is formed between the first and second coil bodies to accommodate the E-type and I-type magnetic bodies. The output surfaces of the first and second coil bodies are located on opposite sides of the magnetic bodies. The E-type and I-type magnetic bodies are simultaneously and tightly fitted to the coils.
[0053] Compared to existing controllers that use filtering structures composed of magnetic bodies and linear copper busbars with the copper busbars passing through the loop magnetic body, resulting in low impedance, achieving the same common-mode interference suppression capability requires a multi-order common-mode interference suppression topology. This involves adding multiple sets of magnetic bodies and Y capacitors, significantly increasing cost and size. In this embodiment, both the first and second coil bodies use a multi-turn copper busbar spiral coil design. The magnetic body passes through the coil, effectively allowing multiple turns of copper busbar to pass through two magnetic bodies, increasing impedance and inductance. Under the same operating conditions and dimensions, this greatly improves common-mode interference suppression while significantly reducing the overall device size. The principle of common-mode interference suppression is that when current flows through a common-mode inductor, the unidirectional nature of the common-mode current generates a unidirectional magnetic field within the coil, increasing the coil's inductive reactance. The more coils there are, the higher the impedance, resulting in stronger damping and better attenuation of the common-mode current, thus further enhancing common-mode interference suppression capability.
[0054] Specifically, the first and second coil bodies are wound and bent using a spiral device, and both the input and output poles at both ends of the first and second coil bodies adopt a flat planar design.
[0055] like Figure 3 As shown, after the mounting base is liquefied at high temperature, it insulates and covers the first coil body 3, the second coil body 4, the first grounding piece 8, and the second grounding piece 11, and after cooling, they are integrated into one piece. An insulating magnetic inner cavity 5-2 for accommodating the E-type magnetic body 2 and the I-type magnetic body 1 is formed in the molding body of the mounting base 5. A snap groove 5-1 for fixing the elastic buckle plate 9 is formed in the molding body of the mounting base 5.
[0056] Specifically, the first coil body 3 and the second coil body 4 are respectively wound around the insulating magnetic inner cavity 5-2 of the E-type magnetic body 2 and the I-type magnetic body 1, and are also wrapped around the E-type magnetic body 2 and the I-type magnetic body 1 on the top, bottom and left and right sides. The elastic buckle 9 is set in the molding body of the mounting base 5 and forms a buckle groove 5-1 for fixing the elastic buckle 9.
[0057] In this embodiment, the insulation thickness of the first coil body 3 and the second coil body 4 covered by the mounting base is equal. The number of turns of the first coil body 3 and the second coil body 4 is the same. The distances of the first coil body 3 and the second coil body 4 from the sides of all magnetic bodies are uniform and symmetrical.
[0058] The first Y capacitor 6 and the second Y capacitor 7 are placed on one side of the bottom of the mounting base 5, with one pole connected in parallel with the first grounding piece 8 and the other pole connected in parallel with the first coil body 3; the third Y capacitor 10 and the fourth capacitor 12 are placed on one side of the bottom of the mounting base 5, with one pole connected in parallel with the second grounding piece 11; the other pole of the third Y capacitor 10 and the fourth capacitor 12 is connected in parallel with the second coil body 4.
[0059] like Figure 4 As shown, there are E-type magnetic body 2 and I-type magnetic body 1. The E-type magnetic body 2 adopts the E-type structural design and the I-type magnetic body 1 elongated structural design. The I-type magnetic body 1 and the E-type magnetic body 2 are pasted together to form two magnetic body circuits. In addition to being simple to assemble and using less magnetic material, the leakage magnetic performance is also greatly improved.
[0060] Type E magnet 2 and Type I magnet 1 pass through the coil and are disposed within the molded body of the mounting base 5, forming an insulating magnetic inner cavity 5-2 to accommodate them. The Type E magnet 2 and Type I magnet 1 are symmetrically equal in size to the two sides of the first coil body 3 and the second coil body 4. An elastic buckle 9 is fixed to a snap-fit groove 5-1 within the molded body of the mounting base 5. The elastic buckle 9 tightly presses the Type I magnet 1 with its elastic structure. The end of the Type E magnet 2 furthest from the Type I magnet 1...
[0061] The assembly process of the filter device for enhancing common-mode interference immunity is as follows:
[0062] First, the first coil body 3 and the second coil body 4 of the N-turn copper busbar coil are wound and bent using a spiral device and then formed. Then, the two ends of the multi-turn copper busbar of the first coil body 3 and the second coil body 4 are cold-forged into input connection end face and output connection end face. After the first coil body 3, the second coil body 4, the first grounding piece 8 and the second grounding piece 11 are cooled and formed into a whole, they are placed into a mold container for fixation. The resin insulation material of the mounting base 5 is decomposed into liquid by the heating of the injection molding equipment and injected into the fixed mold container under high pressure to cover it. After cooling, a whole structure is formed.
[0063] Type E magnetic body 2 and Type I magnetic body 1 are disposed on the inner cavity 5-2 of the molded body of the mounting base 5. The elastic buckle 9 is fixed to the snap-fit groove 5-1 within the molded body of the mounting base 5. The elastic buckle 9 presses the Type I magnetic body 1 tightly with its elastic structure. The first Y capacitor 6 and the second Y capacitor 7 are placed on one side of the bottom of the mounting base 5, with one pole connected in parallel with the first grounding plate 8. The third Y capacitor 10 and the fourth capacitor 12 are placed on one side of the bottom of the mounting base 5, with one pole connected in parallel with the second grounding plate 11. One pole of the first Y capacitor 6 and the second Y capacitor 7 is connected in parallel with the first coil body 3. One pole of the third Y capacitor 10 and the fourth capacitor 12 is connected in parallel with the second coil body 4. This completes the assembly of the filter device for improving common-mode interference immunity.
[0064] The preferred embodiments of this utility model have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of this utility model without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of this utility model through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.
Claims
1. A filter device for enhancing common-mode interference immunity, comprising a magnetic body, a mounting base (5), a first coil body (3), and a second coil body (4), wherein the first coil body (3) and the second coil body (4) are fixed on the mounting base (5), and the magnetic body passes through the first coil body (3) and the second coil body (4) and is mounted on the mounting base (5), characterized in that, The mounting base (5) is made of insulating material and fits and covers the outside of the first coil body (3) and the second coil body (4). The mounting base (5) has an insulating inner cavity that matches the shape of the magnetic body. The magnetic body is installed in the insulating inner cavity and wraps around the outside of the first coil body (3) and the second coil body (4).
2. The filtering device for enhancing common-mode anti-interference capability according to claim 1, characterized in that, The first coil body (3) and the second coil body (4) are both flat wire structures. The first coil body (3) and the second coil body (4) are both multi-turn spiral coils. The coils of the first coil body (3) and the second coil body (4) are coaxially arranged.
3. The filtering device for enhancing common-mode anti-interference capability according to claim 2, characterized in that, The first coil body (3) and the second coil body (4) have the same number of turns.
4. The filtering device for enhancing common-mode anti-interference capability according to claim 2, characterized in that, The first coil body (3) includes a first flat wire input segment and a first flat wire output segment located on the same straight line. The first flat wire input segment bends toward the side closer to the first flat wire output segment. The first flat wire input segment and the first flat wire output segment are located in the same plane. The second coil body (4) includes a second flat wire input segment and a second flat wire output segment located on the same straight line. The second flat wire output segment bends toward the side closer to the second flat wire input segment. The second flat wire input segment and the second flat wire output segment are located in the same plane.
5. The filtering device for enhancing common-mode anti-interference capability according to claim 4, characterized in that, The first coil body (3) and the second coil body (4) are stacked and installed. The first flat wire input segment, the first flat wire output segment, the second flat wire input segment and the second flat wire output segment are located in the same plane. The first flat wire input segment and the second flat wire input segment are parallel to each other and located at the same end of the mounting base (5). The first flat wire output segment and the second flat wire output segment are parallel to each other and located at the other end of the mounting base (5).
6. The filtering device for enhancing common-mode anti-interference capability according to claim 1, characterized in that, The first coil body (3) and the second coil body (4) have the same width and thickness of the winding flat wire. The radial width of the cross-section of the first coil body (3) along the coil axis is greater than the axial height.
7. The filtering device for enhancing common-mode anti-interference capability according to claim 1, characterized in that, The mounting base (5) has an equal thickness covering the outer sides of the first coil body (3) and the second coil body (4).
8. The filtering device for enhancing common-mode anti-interference capability according to claim 1, characterized in that, The input and output ends of the first coil body (3) and the input and output ends of the second coil body (4) are all provided with flat connecting end faces formed by cold heading, and bolt holes are provided on the connecting end faces.
9. A filtering device for enhancing common-mode anti-interference capability according to claim 1, characterized in that, The device also includes an elastic buckle plate (9). The magnetic body includes a type I magnetic body (1) and an E-type magnetic body (2). The insulating inner cavity is provided with an insulating magnetic inner cavity (5-2) that matches the shape of the E-type magnetic body (2). The E-type magnetic body (2) is inserted into the insulating magnetic inner cavity (5-2). The type I magnetic body (1) is installed at the open end of the E-type magnetic body (2). The insulating inner cavity has a snap-fit groove (5-1) on the side wall near the end of the type I magnetic body (1). The elastic buckle plate (9) is installed in the snap-fit groove (5-1) and abuts against the end face of the type I magnetic body (1) away from the E-type magnetic body (2).
10. A filtering device for enhancing common-mode anti-interference capability according to claim 1, characterized in that, The device also includes a first Y capacitor (6) and a second Y capacitor (7), a first grounding plate (8), a third Y capacitor (10), a second grounding plate (11), and a fourth capacitor (12); The first grounding piece (8) and the second grounding piece (11) are fixed at both ends of the bottom of the mounting base (5). The first Y capacitor (6) and the second Y capacitor (7) are placed on the side of the bottom of the mounting base (5) close to the first grounding piece (8), and one pole is connected in parallel with the first grounding piece (8), and the other pole is connected in parallel with the first coil body (3). The third Y capacitor (10) and the fourth capacitor (12) are placed on the bottom of the mounting base (5) near the second grounding plate (11), with one pole connected in parallel with the second grounding plate (11) and the other pole connected in parallel with the second coil body (4).