EMC filtering electromagnetic shielding structure and on-board charger

Abstract

Disclosed in the present invention are an EMC filtering electromagnetic shielding structure and an on-board charger. The EMC filtering electromagnetic shielding structure comprises a housing and a cover plate arranged on the housing; a filtering cavity and a main power cavity separated by a shielding wall are formed in the housing, a filtering component is arranged in the filtering cavity, and a main power component is arranged in the main power cavity; and a connection having an electromagnetic shielding effect is maintained between the shielding wall and the cover plate. Such configurations have the advantage of a good electromagnetic shielding effect, effectively preventing electromagnetic interference from the main power component to the filtering component.

Description

EMC filter electromagnetic shielding structure and on-board charger Technical Field

[0001] This invention relates to the field of electromagnetic shielding technology, and in particular to an EMC-filtered electromagnetic shielding structure and an on-board charger using the EMC-filtered electromagnetic shielding structure. Background Technology

[0002] Electromagnetic compatibility (EMC) refers to the ability of electrical and electronic products to operate normally in an electromagnetic environment without causing excessive electromagnetic interference to other products in that environment. On-board chargers (OBCs) can generally be divided into several parts, including high-voltage AC input, high-voltage DC output, low-voltage DC output, and low-voltage signal modules. During the AC-DC conversion process, high-frequency controlled power MOSFETs, transformers, inductors, and other main power components generate electric and magnetic field interference during power conversion. This interference can radiate outwards through space and wire terminals, so it needs to be processed at the AC input and HV output ports. The usual practice is to add filter components to the AC input and HV output ports, and these filter components need to have a complete cavity for electromagnetic shielding to prevent electromagnetic interference.

[0003] As shown in Figure 1, the main power components are typically mounted on the main power board 100, while the filter components are typically integrated on the filter board 200. The filter board 200 is separate from the main power board 100 and is placed below the main power board 100. The filter board 200 and the main power board 100 are shielded by a metal shielding cover 300. However, since the filter board 200 needs to connect to the main power board 100, and considering safety regulations and connection avoidance, the shielding cover 300 has multiple avoidance openings 310, as shown in Figure 2. Electromagnetic interference cannot be effectively shielded, resulting in electromagnetic interference with the main power board, thus affecting the overall EMC performance of the device. Summary of the Invention

[0004] This invention provides an EMC filter electromagnetic shielding structure and an on-board charger to solve the problem of poor electromagnetic shielding effect in existing EMC filter electromagnetic shielding structures.

[0005] The technical solution of the present invention is an EMC filtering electromagnetic shielding structure, comprising: a housing and a cover plate disposed on the housing;

[0006] The housing contains a filter cavity and a main power cavity separated by a shielding wall. The filter assembly is located in the filter cavity, and the main power assembly is located in the main power cavity.

[0007] The shielding wall and the cover plate maintain a connection that provides electromagnetic shielding.

[0008] Furthermore, a metal connection with electromagnetic shielding effect is maintained between the shielding wall and the cover plate.

[0009] Furthermore, the shielding wall and the cover plate maintain an interference fit connection.

[0010] Furthermore, the filter component and the main power component are disposed in different areas of the same PCB board, and the PCB board is provided with slots corresponding to the shielding wall. The shielding wall passes through the slots and separates the filter component and the main power component into the filter cavity and the main power cavity, respectively.

[0011] Furthermore, the inner side of the cover plate is provided with a first protruding rib corresponding to the position of the shielding wall. The first protruding rib is metal-connected to the PCB board through a first conductor, and the shielding wall is metal-connected to the PCB board through the first conductor.

[0012] Furthermore, the first conductor is segmented and disposed at the connection between the shielding wall and the cover plate.

[0013] Furthermore, the shielding wall is integrally formed with the housing; the cover plate is electrically connected to the shielding wall through a connecting structure.

[0014] Furthermore, the connection structure can be any of the following:

[0015] A first conductive element disposed between the cover plate and the shielding wall; or

[0016] A first groove is provided on the inner side of the cover plate for the insertion of the shielding wall; or

[0017] A first protruding rib is disposed on the inner side of the cover plate, and a first conductive body is disposed between the first protruding rib and the shielding wall; or

[0018] The cover plate is connected to the shielding wall by welding.

[0019] Furthermore, the cover plate and the shielding wall are integrally formed; the shielding wall and the housing are maintained in a metal connection through a first conductor or welding.

[0020] Furthermore, the shielding wall and the cover plate form a complementary fit structure to establish an interference contact.

[0021] Furthermore, the complementary mate structure includes any one of the following:

[0022] The shielding wall directly abuts against the mating surface of the cover plate; or

[0023] The cover plate is provided with a second protruding rib extending away from the shielding wall and a corresponding second groove, the shielding wall being inserted into the second groove; or

[0024] The cover plate is provided with second protruding ribs on both sides corresponding to the shielding wall, protruding towards the shielding wall, and the shielding wall is inserted between the two second protruding ribs; or

[0025] The cover plate is provided with at least one row of multiple segmented second ribs protruding towards the shielding wall on both sides corresponding to the shielding wall. The rows of second ribs are arranged side by side or staggered, and the shielding wall is inserted between two rows of second ribs; or

[0026] The cover plate is provided with a second protruding rib protruding towards the shielding wall, and the top surface of the shielding wall is provided with a second groove that mates with the second protruding rib; or

[0027] The cover plate is provided with multiple segmented second ribs protruding towards the shielding wall, and the shielding wall is provided with multiple protrusions that mate with the gaps between the multiple segmented second ribs, the protrusions being inserted into the gaps accordingly; or

[0028] The cover plate is provided with a second protruding rib and a corresponding second groove protruding in the direction away from the shielding wall. The PCB board is provided with a second conductor that cooperates with the second groove. The second conductor is inserted into the second groove and makes interference contact with the cover plate. At the same time, the shielding wall abuts against the PCB board and makes interference contact with the PCB board.

[0029] Furthermore, the filtering component is disposed on an EMC filtering circuit board, and the main power component is disposed on a main power circuit board. The EMC filtering circuit board and the main power circuit board are connected by copper busbars passing through the filtering cavity and the main power cavity. The side walls of the filtering cavity and the main power cavity adjacent to the shielding wall are provided with through holes for the copper busbars to pass through. The gap between the through holes and the copper busbars is sealed with conductive adhesive.

[0030] Furthermore, the filtering component includes an HV filtering component and an AC filtering component;

[0031] The casing is provided with two shielding walls, and there are two filter cavities, namely the HV filter cavity and the AC filter cavity located on both sides of the main power cavity;

[0032] The HV filter component is disposed within the HV filter cavity, and the AC filter component is disposed within the AC filter cavity.

[0033] The present invention also proposes an on-board charger, including an on-board DC-DC conversion module and an EMC filtering electromagnetic shielding structure as described above.

[0034] Compared with the prior art, the present invention has at least the following beneficial effects:

[0035] 1. The EMC filtering electromagnetic shielding structure of the present invention has a shielding wall inside the housing, which separates the filtering cavity from the main power cavity. The filtering component is located inside the filtering cavity, and the main power component is located inside the main power cavity, thereby electromagnetically shielding the filtering component and the main power component. The shielding wall and the cover plate are connected for electromagnetic shielding, which can better separate the filtering cavity and the main power cavity and effectively prevent electromagnetic interference from the main power component to the filtering component.

[0036] 2. The filter components and main power components are located in different areas of the same PCB board. The PCB board has slots corresponding to the shielding wall. The shielding wall passes through the slots, separating the filter components and main power components in the filter cavity and the main power cavity. This not only improves the EMC shielding performance, but also reduces assembly steps and lowers production costs. Attached Figure Description

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used herein in the specification is for the purpose of describing particular embodiments only and is not intended to limit the invention; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and foregoing drawings are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or foregoing drawings are used to distinguish different objects and not to describe a particular order.

[0038] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1 is a three-dimensional structural diagram of the existing EMC filter electromagnetic shielding structure;

[0040] Figure 2 is a plan view of the existing EMC filter electromagnetic shielding structure;

[0041] Figure 3 is a three-dimensional structural schematic diagram of the EMC filtering electromagnetic shielding structure proposed in this invention;

[0042] Figure 4 is a three-dimensional structural diagram of the housing proposed in this invention;

[0043] Figure 5 is a schematic diagram of the planar structure of the EMC filtering electromagnetic shielding structure proposed in this invention;

[0044] Figure 6 is a structural schematic diagram of the first connection method between the shielding wall and the cover plate proposed in this invention;

[0045] Figure 7 is a structural schematic diagram of the second connection method between the shielding wall and the cover plate proposed in this invention;

[0046] Figure 8 is a structural schematic diagram of the third connection method between the shielding wall and the cover plate proposed in this invention;

[0047] Figure 9 is a structural schematic diagram of the fourth connection method between the shielding wall and the cover plate proposed in this invention;

[0048] Figure 10 is a structural schematic diagram of the fifth connection method between the shielding wall and the cover plate proposed in this invention;

[0049] Figure 11 is a structural schematic diagram of the sixth connection method between the shielding wall and the cover plate proposed in this invention;

[0050] Figure 12 is a waveform diagram of electromagnetic radiation in the prior art;

[0051] Figure 13 is a waveform diagram of electromagnetic radiation proposed in this invention;

[0052] Figure 14 is a schematic diagram of the planar structure of an EMC filtering electromagnetic shielding structure according to another embodiment of the present invention;

[0053] Figure 15 is a structural schematic diagram of the seventh connection method between the shielding wall and the cover plate proposed in this invention;

[0054] Figure 16 is a structural schematic diagram of the eighth connection method between the shielding wall and the cover plate proposed in this invention;

[0055] Figure 17 is a schematic diagram of the back structure of the cover plate in Figure 16;

[0056] Figure 18 is a structural schematic diagram of the ninth connection method between the shielding wall and the cover plate proposed in this invention;

[0057] Figure 19 is a schematic diagram of the back structure of the cover plate in Figure 18;

[0058] Figure 20 is a structural schematic diagram of the tenth connection method between the shielding wall and the cover plate proposed in this invention;

[0059] Figure 21 is a schematic diagram of the back structure of the cover plate in Figure 20;

[0060] Figure 22 is a structural schematic diagram of the eleventh connection method between the shielding wall and the cover plate proposed in this invention;

[0061] Figure 23 is a schematic diagram of the back structure of the cover plate in Figure 22;

[0062] Figure 24 is a structural schematic diagram of the twelfth connection method between the shielding wall and the cover plate proposed in this invention;

[0063] Figure 25 is a schematic diagram of the back structure of the cover plate in Figure 24;

[0064] Figure 26 is a structural schematic diagram of the thirteenth connection method between the shielding wall and the cover plate proposed in this invention;

[0065] Figure 27 is a schematic diagram of the back structure of the cover plate in Figure 26;

[0066] Figure 28 is a structural schematic diagram of a connection method between the shielding wall and the cover plate proposed in this invention.

[0067] Figure label:

[0068] 1. Housing;

[0069] 11. Shielding wall; 12. Protrusion; 13. Main power cavity; 14. Filter cavity; 15. Main power assembly; 16. Filter assembly; 17. Stud; 18. Copper busbar;

[0070] 2. Cover plate;

[0071] 20. First groove; 21. First rib; 22. Second rib;

[0072] 3. PCB board;

[0073] 31. Slot; 32. Screw hole; 33. Second conductor; 34. EMC filter circuit board; 35. Main power circuit board;

[0074] 4. First conductor. Detailed Implementation

[0075] To make the technical problems, technical solutions, and beneficial effects of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. Therefore, a feature pointed out in this specification is used to illustrate one feature of one embodiment of the invention, and does not imply that every embodiment of the invention must have the described feature. Furthermore, it should be noted that this specification describes many features. Although certain features may be combined to illustrate possible system designs, these features may also be used in other combinations not explicitly stated. Therefore, unless otherwise stated, the described combinations are not intended to be limiting.

[0076] The principles and structure of the present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0077] The following description uses the EMC filtering electromagnetic shielding structure of an on-board charger as an example to illustrate the EMC filtering electromagnetic shielding structure of the present invention. Basic Implementation

[0078] As shown in Figures 3-5, this embodiment of the invention provides an EMC filtering electromagnetic shielding structure, comprising: a housing 1, a cover plate 2 disposed on the housing 1, and a shielding wall 11 disposed between the housing 1 and the cover plate 2. The housing 1 includes a main power cavity 13 and a filter cavity 14 separated by the shielding wall 11. A main power component 15 is disposed within the main power cavity 13, and a filter component 16 is disposed within the filter cavity 14. The filter component 16 includes an HV filter component and an AC filter component. The shielding wall 11 and the cover plate 2 maintain a connection that provides electromagnetic shielding; both the housing 1 and the cover plate 2 are made of metal, thus providing electromagnetic shielding.

[0079] In this embodiment, two shielding walls 11 are provided inside the housing 1, and there are two filter cavities 14, namely an HV filter cavity and an AC filter cavity located on both sides of the main power cavity 13. The HV filter component is disposed in the HV filter cavity, and the AC filter component is disposed in the AC filter cavity. Of course, there can be one or more shielding walls 11, depending on the specific actual needs, and this invention does not impose any restrictions on this. Example 1

[0080] In this embodiment, the shielding wall 11 and the cover plate 2 are connected by a metal connection that provides electromagnetic shielding, thereby electromagnetically shielding the filter component 16 and the main power component 15 and effectively preventing electromagnetic interference from the main power component 15 to the filter component 16.

[0081] In this embodiment, the filter component 16 and the main power component 15 are both mounted on the same PCB board 3, and are respectively located in different areas corresponding to the main power cavity 13 and the filter cavity 14. The PCB board 3 has slots 31 corresponding to the shielding wall 11 and multiple screw holes 32. The housing 1 also has multiple studs 17 corresponding to the screw holes 32. During assembly, the shielding wall 11 is passed through the slots 31, the PCB board 3 is placed over the main power cavity 13 and the filter cavity 14, and fixed using the studs 17, thus separating the filter component 16 and the main power component 15 within the filter cavity 14 and the main power cavity 13. The fact that the filter component 16 and the main power component 15 are both mounted on the same PCB board 3 improves EMC shielding performance while reducing assembly steps and lowering production costs.

[0082] In this embodiment of the invention, the shielding wall 11 is made of metal and can be fixed inside the housing 1 by welding. The shielding wall 11 can also be integrally formed with the housing 1, thereby achieving a better EMC shielding effect. In this embodiment of the invention, the cover plate 2 and the shielding wall 11 can be kept in a metal connection through various methods.

[0083] As shown in Figure 6, in a preferred implementation, the cover plate 2 can also be metal-connected to the shielding wall 11 through a first conductor 4, which can be conductive foam, metal spring, conductive powder or conductive adhesive.

[0084] As shown in Figure 7, in another preferred implementation, the inner side of the cover plate 2 is provided with a first groove 20 corresponding to the shielding wall 11, and the shielding wall 11 is inserted into the first groove 20, thereby forming a metal connection with the cover plate 2 that has an electromagnetic shielding effect.

[0085] As shown in Figure 8, in another preferred implementation, the inner side of the cover plate 2 is provided with a first protruding rib 21 corresponding to the shielding wall 11, and the shielding wall 11 is metal-connected to the first protruding rib 21 through a first conductor 4.

[0086] As shown in Figure 9, in another preferred implementation, the cover plate 2 and the shielding wall 11 are integrally formed, and the shielding wall 11 and the housing 1 are maintained in a metal connection through the first conductor 4. The shielding wall 11 can also be maintained in a metal connection with the housing 1 by welding. Furthermore, the cover plate 2 and the shielding wall 11 can also be connected by welding.

[0087] As shown in Figure 10, in another preferred implementation, the PCB board 3 does not have a slot 31 through which the shielding wall 11 passes. The inner side of the cover plate 2 is provided with a first protruding rib 21 corresponding to the position of the shielding wall 11. The first protruding rib 21 and the PCB board 3 are kept in a metal connection through a first conductor 4. The shielding wall 11 and the PCB board 3 are kept in a metal connection through the first conductor 4.

[0088] It should be noted that, in the various ways in which the cover plate 2 and the shielding wall 11 are connected by the first conductor 4, the first conductor 4 may be provided at all the connection parts of the shielding wall 11 and the cover plate 2, or it may be provided in sections at the connection parts of the shielding wall 11 and the cover plate 2, as shown in Figure 11.

[0089] Figure 12 shows the EMC radiation test values ​​of the prior art, and Figure 13 shows the EMC radiation test values ​​of the EMC filtering electromagnetic shielding structure adopted in the embodiment of the present invention. It can be seen that, compared with the prior art, the EMC radiation test value of the EMC filtering electromagnetic shielding structure adopted in the embodiment of the present invention is reduced by 10 dBµV / m, and has a better electromagnetic shielding effect.

[0090] As shown in Figure 14, in another embodiment of the present invention, the filter component 16 is disposed on an EMC filter circuit board 34, and the main power component 15 is disposed on a main power circuit board 35. The EMC filter circuit board 34 and the main power circuit board 35 are connected by copper busbars 18 passing through the filter cavity 14 and the main power cavity 13. The filter cavity 14 and the main power cavity 13 are provided with through holes on the side walls adjacent to the shielding wall 11 for the copper busbars 18 to pass through. The gap between the through holes and the copper busbars 18 is sealed with conductive adhesive.

[0091] It should be noted that in the above embodiments, the filtering component 16 includes an HV filtering component and an AC filtering component, and two corresponding filtering cavities 14 are respectively provided in the housing 1 through the shielding wall 11. In other embodiments, the filtering component 16 can be one or more, and the filtering cavity 14 in the housing 1 can also be divided into one or more corresponding filtering cavities 14 by the shielding wall 11. Those skilled in the art can set it according to specific circumstances, and the present invention does not limit it in this way. Example 2

[0092] In this embodiment, the interference fit between the shielding wall 11 and the cover plate 2 is used as an example.

[0093] In this embodiment, the filter component 16 and the main power component 15 are both mounted on the same PCB board 3, and are respectively located in different areas corresponding to the main power cavity 13 and the filter cavity 14. The PCB board 3 has slots 31 corresponding to the shielding wall 11 and multiple screw holes 32. The housing 1 also has multiple studs 17 corresponding to the screw holes 32. During assembly, the shielding wall 11 is passed through the slots 31, the PCB board 3 is placed over the main power cavity 13 and the filter cavity 14, and fixed using the studs 17, thus separating the filter component 16 and the main power component 15 within the filter cavity 14 and the main power cavity 13. The fact that the filter component 16 and the main power component 15 are both mounted on the same PCB board 3 improves EMC shielding performance while reducing assembly steps and lowering production costs.

[0094] In this embodiment of the invention, both the housing 1 and the cover plate 2 are made of metal, thus providing electromagnetic shielding. The shielding wall 11 is integrally formed with the housing 1. Furthermore, the shielding wall 11 and the cover plate 2 are connected by an interference fit, eliminating the need for welding or connection with conductive materials. This achieves both good electromagnetic shielding and good thermal radiation shielding, ensuring EMC shielding performance while reducing processing steps and lowering production costs. The specific implementation of the interference fit between the shielding wall 11 and the cover plate 2 is described below.

[0095] As shown in Figure 15, in one implementation of the present invention, by controlling the machining tolerances of the housing 1 and the cover plate 2, the cover plate 2 and the shielding wall 11 are ensured to have an interference fit in the height direction. When the cover plate 2 and the housing 1 are assembled and fixed, the shielding wall 11 will slightly lift the contact portion with the cover plate 2, thereby maintaining an interference fit connection with the cover plate 2.

[0096] As shown in Figures 16 and 17, in another implementation of the present invention, the cover plate 2 is provided with a second protruding rib 22 corresponding to the position of the shielding wall 11 and protruding towards the front of the cover plate 2. A second groove corresponding to the second protruding rib 22 is formed on the back of the cover plate 2. The shielding wall 11 is inserted into the second groove, thereby maintaining an interference contact connection with the cover plate 2. It should be noted that, in this application, the side of the cover plate 2 away from the shielding wall 11 is defined as the front, and the side closer to the shielding wall 11 is defined as the back.

[0097] As shown in Figures 18 and 19, in another implementation of the present invention, the cover plate 2 is provided with second protruding ribs 22 on both sides of the corresponding position of the shielding wall 11, which protrude toward the back of the cover plate 2. The shielding wall 11 is inserted between the second protruding ribs 22 and maintains an interference contact connection with the cover plate 2.

[0098] As shown in Figures 20 and 21, in another implementation of the present invention, a row of multiple segmented and parallel second ribs 22 are respectively provided on both sides of the cover plate 2 at the corresponding positions of the shielding wall 11, and the shielding wall 11 is inserted between the two rows of second ribs 22 to maintain an interference contact connection with the cover plate 2.

[0099] As shown in Figures 22 and 23, in another implementation of the present invention, a row of multiple segmented and staggered second ribs 22 are respectively provided on both sides of the cover plate 2 at the corresponding positions of the shielding wall 11, and the shielding wall 11 is inserted between the two rows of second ribs 22, and maintains an interference contact connection with the cover plate 2.

[0100] As shown in Figures 24 and 25, in another implementation of the present invention, the cover plate 2 is provided with a second protruding rib 22 at a corresponding position to the shielding wall 11, protruding towards the back of the cover plate 2. The top surface of the shielding wall 11 is provided with a second groove (not marked) corresponding to the second protruding rib 22. The second groove cooperates with the second protruding rib 22, so that the shielding wall 11 and the cover plate 2 maintain an interference contact connection.

[0101] As shown in Figures 26 and 27, in another implementation of the present invention, the cover plate 2 and the shielding wall 11 are provided with a plurality of segmented second ribs 22 protruding toward the back of the cover plate 2 at corresponding positions. The shielding wall 11 is provided with a plurality of protrusions 12 corresponding to the gaps between the plurality of second ribs 22. The plurality of protrusions 12 are inserted into the gaps formed between the plurality of segmented second ribs 22, so that the shielding wall 11 and the cover plate 2 maintain an interference contact connection.

[0102] As shown in Figure 28, in another implementation of the present invention, the cover plate 2 is provided with a second protruding rib 22 that corresponds to the position of the shielding wall 11 and protrudes towards the front of the cover plate 2. The back of the cover plate 2 is provided with a second groove corresponding to the second protruding rib 22. The PCB board 3 is provided with a second conductor 33 corresponding to the second groove. The second conductor 33 is inserted into the second groove and maintains an interference contact connection with the cover plate 2. The shielding wall 11 abuts against the PCB board 3 and maintains an interference contact connection with the PCB board 3. Example 3

[0103] In this embodiment of the invention, an on-board charger is also provided, which includes an on-board DC-DC conversion module and the above-mentioned EMC filtering electromagnetic shielding structure.

[0104] In summary, the EMC filtering electromagnetic shielding structure of this invention includes a shielding wall 11 inside the housing 1, which separates the filter cavity 14 from the main power cavity 13. The filter assembly 16 is disposed within the filter cavity 14, and the main power assembly 15 is disposed within the main power cavity 13, thereby providing electromagnetic shielding for the filter assembly 16 and the main power assembly 15. Furthermore, the cover plate 2 maintains a connection with the shielding wall 11 for electromagnetic shielding (including a metal connection or interference contact connection with electromagnetic shielding effect), further enhancing the separation. The filter cavity 14 and the main power cavity 13 effectively prevent electromagnetic interference from the main power component 15 to the filter component 16. Furthermore, the filter component 16 and the main power component 15 are located in different areas on the same PCB board 3. The PCB board 3 has slots 31 corresponding to the shielding wall 11. The shielding wall 11 passes through the slots 31, separating the filter component 16 and the main power component 15 within the filter cavity 14 and the main power cavity 13. This not only improves the EMC shielding performance but also reduces assembly steps and lowers production costs.

[0105] Obviously, the embodiments described above are merely some embodiments of the present invention, not all embodiments. The accompanying drawings show preferred embodiments of the present invention, but do not limit the patent scope of the present invention. The present invention can be implemented in many different forms; rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific embodiments, or make equivalent substitutions for some of the technical features. Any equivalent structures made using the content of this specification and drawings, directly or indirectly applied to other related technical fields, are similarly within the patent protection scope of this invention.

Claims

1. An EMC filtering electromagnetic shielding structure, characterized in that, include: The housing (1) and the cover plate (2) disposed on the housing (1); The housing (1) is provided with a filter cavity (14) and a main power cavity (13) separated by a shielding wall (11). The filter assembly (16) is disposed in the filter cavity (14) and the main power assembly (15) is disposed in the main power cavity (13). The shielding wall (11) and the cover plate (2) maintain a connection that provides electromagnetic shielding.

2. The EMC filtering electromagnetic shielding structure as described in claim 1, characterized in that, The shielding wall (11) and the cover plate (2) maintain a metal connection with electromagnetic shielding effect.

3. The EMC filtering electromagnetic shielding structure as described in claim 1, characterized in that, The shielding wall (11) is connected to the cover plate (2) by interference fit.

4. The EMC filtering electromagnetic shielding structure as described in claim 2 or 3, characterized in that, The filter component (16) and the main power component (15) are disposed in different areas on the same PCB board (3). The PCB board (3) has a slot (31) corresponding to the shielding wall (11). The shielding wall (11) passes through the slot (31) and separates the filter component (16) and the main power component (15) in the filter cavity (14) and the main power cavity (13).

5. The EMC filtering electromagnetic shielding structure as described in claim 2, characterized in that, The cover plate (2) is provided with a first protruding rib (21) corresponding to the position of the shielding wall (11). The first protruding rib (21) and the PCB board (3) are connected by a first conductor (4). The shielding wall (11) and the PCB board (3) are connected by a first conductor (4).

6. The EMC filtering electromagnetic shielding structure as described in claim 5, characterized in that, The first conductor (4) is segmented and disposed at the connection between the shielding wall (11) and the cover plate (2).

7. The EMC filtering electromagnetic shielding structure as described in claim 1, characterized in that, The shielding wall (11) is integrally formed with the housing (1); the cover plate (2) is electrically connected to the shielding wall (11) through a connecting structure.

8. The EMC filtering electromagnetic shielding structure as described in claim 7, characterized in that, The connection structure can be any of the following: A first conductor (4) is disposed between the cover plate (2) and the shielding wall (11); or A first groove (20) is provided on the inner side of the cover plate (2) for the shielding wall (11) to be inserted; or A first protruding rib (21) disposed on the inner side of the cover plate (2), and a first conductive body (4) disposed between the first protruding rib (21) and the shielding wall (11); or The cover plate (2) and the shielding wall (11) are connected by welding.

9. The EMC filtering electromagnetic shielding structure as described in claim 2, characterized in that, The cover plate (2) is integrally formed with the shielding wall (11); the shielding wall (11) and the housing (1) are connected by a first conductor (4) or by welding.

10. The EMC filtering electromagnetic shielding structure as described in claim 3, characterized in that, The shielding wall (11) and the cover plate (2) form a complementary fit structure to establish an interference contact.

11. The EMC filtering electromagnetic shielding structure as described in claim 10, characterized in that, The complementary synergistic structure includes any one of the following: The shielding wall (11) directly abuts against the mating surface of the cover plate (2); or The cover plate (2) is provided with a second protruding rib (22) protruding in a direction away from the shielding wall (11) and a corresponding second groove, the shielding wall (11) being inserted into the second groove; or The cover plate (2) has second protruding ribs (22) on both sides corresponding to the shielding wall (11), protruding towards the shielding wall (11), and the shielding wall (11) is inserted between the two second protruding ribs (22); or The cover plate (2) is provided with at least one row of multiple segmented second ribs (22) on both sides corresponding to the shielding wall (11), protruding towards the shielding wall (11). The rows of second ribs (22) are arranged side by side or staggered. The shielding wall (11) is inserted between two rows of second ribs (22); or The cover plate (2) is provided with a second protruding rib (22) protruding towards the shielding wall (11), and the top surface of the shielding wall (11) is provided with a second groove that mates with the second protruding rib (22); or The cover plate (2) is provided with a plurality of segmented second ribs (22) protruding toward the shielding wall (11), and the shielding wall (11) is provided with a plurality of protrusions (12) that cooperate with the gaps between the plurality of segmented second ribs (22), and the protrusions (12) are inserted into the gaps accordingly; or The cover plate (2) is provided with a second protruding rib (22) protruding in the direction away from the shielding wall (11) and a corresponding second groove. The PCB board (3) is provided with a second conductor (33) that cooperates with the second groove. The second conductor (33) is inserted into the second groove and makes interference contact with the cover plate (2). At the same time, the shielding wall (11) presses against the PCB board (3) and makes interference contact with the PCB board (3).

12. The EMC filtering electromagnetic shielding structure as described in claim 2 or 3, characterized in that, The filter component (16) is disposed on an EMC filter circuit board (34), and the main power component (15) is disposed on a main power circuit board (35). The EMC filter circuit board (34) and the main power circuit board (35) are connected by copper busbars (18) passing through the filter cavity (14) and the main power cavity (13). The filter cavity (14) and the main power cavity (13) are provided with through holes on the side walls adjacent to the shielding wall (11) for the copper busbars (18) to pass through. The gap between the through holes and the copper busbars (18) is sealed with conductive adhesive.

13. The EMC filtering electromagnetic shielding structure as described in claim 2 or 3, characterized in that, The filtering component (16) includes an HV filtering component and an AC filtering component; The housing (1) is provided with two shielding walls (11), and there are two filter cavities (14), namely the HV filter cavity and the AC filter cavity located on both sides of the main power cavity (13); The HV filter component is disposed within the HV filter cavity, and the AC filter component is disposed within the AC filter cavity.

14. An on-board charger, characterized in that, It includes an on-board DC-DC converter module and an EMC filtering electromagnetic shielding structure as described in any one of claims 1 to 13.

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