EMC filter electromagnetic shielding structure and vehicle-mounted charger

Abstract

The utility model discloses an EMC filter electromagnetic shielding structure, it includes: metal casing, with the shielding wall of integral mould of casing, set up on the cover of casing and set up in the filter component and main power component of casing, be provided with the filter cavity and main power cavity that casing is divided apart by shielding wall, filter component sets up in filter cavity, main power component sets up in main power cavity, shielding wall with the cover keeps interference contact connection. Adopt the EMC filter electromagnetic shielding structure of the utility model has the advantages that electromagnetic shielding effect is good and cost is low. The utility model also provides a kind of vehicle-mounted charger using above-mentioned EMC filter electromagnetic shielding structure.

Description

Technical Field

[0001] This utility model relates to the field of electromagnetic shielding technology, and in particular to an EMC filter electromagnetic shielding structure and an on-board charger using the EMC filter 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] To prevent electromagnetic interference, the inventor of this utility model has proposed a technical solution that uses a shielding wall to separate the filter components and the main power components inside the casing. The top of the shielding wall is connected to the casing with a metal connection that provides electromagnetic shielding, thereby ensuring the effectiveness of electromagnetic shielding.

[0004] like Figure 1 As shown, in one implementation, when the cover plate 20 and the shielding wall 10 need to be shielded together, the cover plate 20 and the shielding wall 10 will be connected by laser welding, friction welding, spot welding or other methods. Although this technology can connect the cover plate 20 and the wall 10 together, the welding process will increase the cost of product production.

[0005] like Figure 2 As shown, in another implementation, when the cover plate 20 and the shielding wall 10 need to be shielded together, it is usually necessary to add a conductor 30 between the cover plate 20 and the shielding wall 10. The conductor can be conductive foam, metal spring, conductive powder, conductive adhesive, or absorbing ferrite, etc. Although this technology can connect the cover plate 20 and the shielding wall 10 together, the shielding scheme of adding a conductor will increase the cost of the product. Utility Model Content

[0006] The purpose of this invention is to address the shortcomings of the existing technology by providing an EMC filtering electromagnetic shielding structure with good electromagnetic shielding effect and low cost, as well as an on-board charger using the above-mentioned EMC filtering electromagnetic shielding structure.

[0007] In this embodiment of the present invention, an EMC filtering electromagnetic shielding structure is provided, comprising: a metal housing, a shielding wall integrally formed with the housing, a cover plate disposed on the housing, and a filtering component and a main power component disposed within the housing. The housing contains a filtering cavity and a main power cavity separated by the shielding wall. The filtering component is disposed within the filtering cavity, and the main power component is disposed within the main power cavity. The shielding wall and the cover plate are connected by an interference fit.

[0008] In this embodiment of the present invention, the filtering component and the main power component are disposed in different areas of the same PCB board. The PCB board is provided with a slot corresponding to the shielding wall. The shielding wall passes through the slot and separates the filtering component and the main power component in the filtering cavity and the main power cavity.

[0009] In this embodiment of the utility model, when the cover plate is assembled and fixed with the housing, the shielding wall presses against the cover plate, thereby maintaining an interference contact connection with the cover plate.

[0010] In this embodiment of the utility model, the cover plate is provided with a protruding rib that corresponds to the position of the shielding wall and protrudes towards the cover plate away from the shielding wall. The cover plate is provided with a groove corresponding to the protruding rib in the direction close to the shielding wall. The shielding wall is inserted into the groove, thereby maintaining an interference contact connection with the cover plate.

[0011] In this embodiment of the utility model, the cover plate is provided with protruding ribs on both sides of the corresponding position of the shielding wall, which protrude towards the shielding wall. The shielding wall is inserted between the protruding ribs and maintains an interference contact connection with the cover plate.

[0012] In this embodiment of the utility model, a row of multiple segmented and parallel protruding ribs are respectively provided on both sides of the cover plate at the corresponding position of the shielding wall, and the shielding wall is inserted between the two rows of protruding ribs, maintaining an interference contact connection with the cover plate.

[0013] In this embodiment of the utility model, a row of multiple segmented and staggered protruding ribs are respectively provided on both sides of the cover plate at the corresponding position of the shielding wall, and the shielding wall is inserted between the two rows of protruding ribs, maintaining an interference contact connection with the cover plate.

[0014] In this embodiment of the utility model, the cover plate is provided with a protruding rib at a corresponding position to the shielding wall, and the top surface of the shielding wall is provided with a groove corresponding to the protruding rib. The groove and the protruding rib cooperate to make the shielding wall and the cover plate maintain an interference contact connection.

[0015] In this embodiment of the utility model, the cover plate and the shielding wall are provided with a plurality of segmented protrusions at corresponding positions, which protrude toward the direction of the shielding wall. The shielding wall is provided with a plurality of protrusions corresponding to the gaps between the plurality of protrusions. The plurality of protrusions are inserted into the gaps formed between the plurality of segmented protrusions, so that the shielding wall and the cover plate maintain an interference contact connection.

[0016] In this embodiment of the utility model, the cover plate is provided with a protruding rib that corresponds to the position of the shielding wall and protrudes from the cover plate away from the shielding wall. The cover plate is provided with a groove corresponding to the protruding rib in the direction close to the shielding wall. The PCB board is provided with a conductor corresponding to the groove. The conductor is inserted into the groove and maintains an interference contact connection with the cover plate. The shielding wall abuts against the PCB board, and the PCB board maintains an interference contact connection.

[0017] In this embodiment of the invention, an on-board charger is also provided, which includes an on-board DC-DC conversion module and the aforementioned EMC filtering electromagnetic shielding structure.

[0018] Compared with existing technologies, the EMC filtering electromagnetic shielding structure of this utility model features a shielding wall inside the housing, which separates the filtering cavity from the main power cavity. The filtering component is housed within the filtering cavity, and the main power component is housed within the main power cavity, thereby providing electromagnetic shielding for both the filtering component and the main power component. The shielding wall maintains an interference fit with the cover plate, eliminating the need for welding or conductive material connections. This achieves both good electromagnetic shielding and good thermal radiation shielding, while also reducing assembly steps and lowering production costs. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of an existing EMC filtering electromagnetic shielding structure.

[0020] Figure 2 A planar schematic diagram of another existing EMC filtering electromagnetic shielding structure.

[0021] Figure 3 This is a three-dimensional structural diagram of the EMC filtering electromagnetic shielding structure according to an embodiment of this utility model.

[0022] Figure 4 This is a three-dimensional structural diagram of the casing according to an embodiment of the present utility model.

[0023] Figure 5 This is a schematic diagram of the planar structure of the EMC filtering electromagnetic shielding structure according to an embodiment of the present invention.

[0024] Figure 6 This is a structural schematic diagram of one connection method between the shielding wall and the cover plate in an embodiment of this utility model.

[0025] Figure 7 This is a structural schematic diagram of one connection method between the shielding wall and the cover plate in an embodiment of this utility model.

[0026] Figure 8 yes Figure 7 A schematic diagram of the back structure of the cover plate.

[0027] Figure 9 This is a structural schematic diagram of one connection method between the shielding wall and the cover plate in an embodiment of this utility model.

[0028] Figure 10 yes Figure 9 A schematic diagram of the back structure of the cover plate.

[0029] Figure 11 This is a structural schematic diagram of one connection method between the shielding wall and the cover plate in an embodiment of this utility model.

[0030] Figure 12 yes Figure 11 A schematic diagram of the back structure of the cover plate.

[0031] Figure 13 This is a structural schematic diagram of one connection method between the shielding wall and the cover plate in an embodiment of this utility model.

[0032] Figure 14 yes Figure 13 A schematic diagram of the back structure of the cover plate.

[0033] Figure 15 This is a structural schematic diagram of one connection method between the shielding wall and the cover plate in an embodiment of this utility model.

[0034] Figure 16 yes Figure 15 A schematic diagram of the back structure of the cover plate.

[0035] Figure 17 This is a structural schematic diagram of one connection method between the shielding wall and the cover plate in an embodiment of this utility model.

[0036] Figure 18 yes Figure 17 A schematic diagram of the back structure of the cover plate.

[0037] Figure 19 This is a structural schematic diagram of one connection method between the shielding wall and the cover plate in an embodiment of this utility model. Detailed Implementation

[0038] 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 this utility model.

[0039] like Figures 3-5 As shown in the embodiment of this utility model, an EMC filtering electromagnetic shielding structure is provided, 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 includes an HV filter component and an AC filter component.

[0040] In this embodiment, two shielding walls 11 are provided inside the housing 1, and there are two filter cavities, namely an HV filter cavity and an AC filter cavity located on both sides of the main power cavity 13. The HV filter assembly is disposed in the HV filter cavity, and the AC filter assembly 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 utility model does not impose any restrictions on this.

[0041] 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. By mounting the filter component 16 and the main power component 15 on the same PCB board, the EMC shielding performance is improved, while assembly steps are reduced, lowering production costs.

[0042] 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. The shielding wall 11 and the cover plate 2 are connected by an interference fit, eliminating the need for welding or connecting 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.

[0043] like Figure 6 As shown, in one implementation of this utility model, 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 part with the cover plate 2, thereby maintaining an interference fit connection with the cover plate 2.

[0044] like Figure 7 , Figure 8 As shown, in another implementation of this utility model, the cover plate 2 is provided with a protruding rib 21 corresponding to the position of the shielding wall 11 and protruding towards the front of the cover plate 2. A groove corresponding to the protruding rib 21 is formed on the back of the cover plate 2. The shielding wall 11 is inserted into the 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.

[0045] like Figure 9 , Figure 10 As shown, in another implementation of this utility model, the cover plate 2 is provided with protruding ribs 21 on both sides of the corresponding position of the shielding wall 11, which protrude towards the back of the cover plate 2. The shielding wall is inserted between the protruding ribs and maintains an interference contact connection with the cover plate 2.

[0046] like Figure 11 , Figure 12 As shown, in another implementation of this utility model, a row of multiple segmented and parallel protruding ribs 21 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 two rows of protruding ribs 21, maintaining an interference contact connection with the cover plate 2.

[0047] like Figure 13 , Figure 14 As shown, in another implementation of this utility model, a row of multiple segmented and staggered protruding ribs 21 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 protruding ribs 21, and maintains an interference contact connection with the cover plate 2.

[0048] like Figure 15 , Figure 16As shown, in another implementation of this utility model, the cover plate 2 is provided with a protruding rib 21 at the corresponding position of the shielding wall 11, which protrudes toward the back of the cover plate 2. The top surface of the shielding wall 11 is provided with a groove (not marked) corresponding to the protruding rib 21. The groove and the protruding rib 21 cooperate with each other, so that the shielding wall 11 and the cover plate 2 maintain an interference contact connection.

[0049] like Figure 17 , Figure 18 As shown, in another implementation of this utility model, the cover plate 2 and the shielding wall 11 are provided with a plurality of segmented protrusions 21 punched 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 protrusions 21. The plurality of protrusions 12 are inserted into the gaps formed between the plurality of segmented protrusions 21, so that the shielding wall 11 and the cover plate 2 maintain an interference contact connection.

[0050] like Figure 19 As shown, in another implementation of this utility model, the cover plate 2 is provided with a protruding rib 21 that corresponds to the position of the shielding wall 11 and protrudes towards the front of the cover plate. The back of the cover plate 2 is provided with a groove corresponding to the protruding rib 21. The PCB board is provided with a conductor 33 corresponding to the groove. The conductor 33 is inserted into the 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.

[0051] Furthermore, in this embodiment of the present invention, an on-board charger is also provided, which includes an on-board DC-DC conversion module and the aforementioned EMC filtering electromagnetic shielding structure.

[0052] In summary, the EMC filtering electromagnetic shielding structure of this utility model features a shielding wall inside the housing, which separates the filtering cavity from the main power cavity. The filtering component is housed within the filtering cavity, and the main power component is housed within the main power cavity, thereby providing electromagnetic shielding for both the filtering component and the main power component. The shielding wall maintains an interference fit with the cover plate, eliminating the need for welding or conductive material connections. This approach ensures EMC shielding performance while reducing assembly steps and lowering production costs.

[0053] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An EMC filtering electromagnetic shielding structure, characterized in that, include: The device comprises a metal casing, a shielding wall integrally formed with the casing, a cover plate disposed on the casing, and a filter assembly and a main power assembly disposed within the casing. The casing contains a filter cavity and a main power cavity separated by the shielding wall. The filter assembly is disposed within the filter cavity, and the main power assembly is disposed within the main power cavity. The shielding wall and the cover plate are connected by an interference fit.

2. The EMC filtering electromagnetic shielding structure as described in claim 1, characterized in that, The filtering component and the main power component are disposed 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 and separates the filtering component and the main power component into the filtering cavity and the main power cavity, respectively.

3. The EMC filtering electromagnetic shielding structure as described in claim 1 or 2, characterized in that, When the cover plate is assembled and fixed to the housing, the shielding wall presses against the cover plate, thereby maintaining an interference contact connection with the cover plate.

4. The EMC filtering electromagnetic shielding structure as described in claim 1 or 2, characterized in that, The cover plate is provided with a protruding rib that corresponds to the position of the shielding wall and protrudes from the cover plate away from the shielding wall. The cover plate is provided with a groove corresponding to the protruding rib in the direction close to the shielding wall. The shielding wall is inserted into the groove, thereby maintaining an interference contact connection with the cover plate.

5. The EMC filtering electromagnetic shielding structure as described in claim 1 or 2, characterized in that, The cover plate is provided with protruding ribs on both sides of the corresponding position of the shielding wall, which protrude towards the shielding wall. The shielding wall is inserted between the protruding ribs and maintains an interference contact connection with the cover plate.

6. The EMC filtering electromagnetic shielding structure as described in claim 1 or 2, characterized in that, On the cover plate, on both sides of the corresponding position of the shielding wall, there are a row of multiple segmented and parallel protruding ribs that punch out toward the direction of the shielding wall. The shielding wall is inserted between the two rows of protruding ribs and maintains an interference contact connection with the cover plate.

7. The EMC filtering electromagnetic shielding structure as described in claim 1 or 2, characterized in that, On the cover plate, on both sides of the corresponding position of the shielding wall, there are a row of multiple segmented and staggered protruding ribs that punch out toward the shielding wall. The shielding wall is inserted between the two rows of protruding ribs and maintains an interference contact connection with the cover plate.

8. The EMC filtering electromagnetic shielding structure as described in claim 1 or 2, characterized in that, The cover plate is provided with protruding ribs at corresponding positions to the shielding wall, and the top surface of the shielding wall is provided with grooves corresponding to the protruding ribs. The grooves cooperate with the protruding ribs so that the shielding wall and the cover plate maintain an interference contact connection.

9. The EMC filtering electromagnetic shielding structure as described in claim 1 or 2, characterized in that, The cover plate and the shielding wall are provided with a plurality of segmented protrusions at corresponding positions, which protrude toward the direction of the shielding wall. The shielding wall is provided with a plurality of protrusions corresponding to the gaps between the plurality of protrusions. The plurality of protrusions are inserted into the gaps formed between the plurality of segmented protrusions, so that the shielding wall and the cover plate maintain an interference contact connection.

10. The EMC filtering electromagnetic shielding structure as described in claim 2, characterized in that, The cover plate is provided with protruding ribs that correspond to the position of the shielding wall and protrude toward the cover plate away from the shielding wall. The cover plate is provided with grooves corresponding to the protruding ribs in the direction close to the shielding wall. The PCB board is provided with conductors corresponding to the grooves. The conductors are inserted into the grooves and maintain an interference contact connection with the cover plate. The shielding wall abuts against the PCB board and maintains an interference contact connection with the PCB board.

11. 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 1-10.

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