EMC filtering electromagnetic shielding structure and vehicle-mounted charger

Abstract

The utility model discloses an EMC filtering electromagnetic shielding structure, which comprises a casing, a shielding wall, a top cover arranged on the casing, a filtering assembly and a main power assembly, the filtering assembly and the main power assembly are arranged in the casing, and a filtering cavity and a main power cavity which are separated by the shielding wall are arranged in the casing. The filtering assembly is arranged in the filtering cavity, the main power assembly is arranged in the main power cavity, and the shielding wall and the top cover are in metal connection with an electromagnetic shielding effect. The EMC filtering electromagnetic shielding structure provided by the utility model has the advantage of good electromagnetic shielding effect. The utility model also provides a vehicle-mounted charger adopting the EMC filtering electromagnetic shielding structure.

Description

TECHNICAL FIELD

[0001] The utility model relates to electromagnetic shielding technical field especially relates to a EMC filter electromagnetic shielding structure and adopt the vehicle charger of EMC filter electromagnetic shielding structure. BACKGROUND

[0002] Electromagnetic compatibility (EMC) refers to the electric appliance electronic product can work normally in electromagnetic environment, and does not produce excessive electromagnetic interference to other products in the environment, vehicle charger (OBC) can be roughly divided into several parts such as high-voltage alternating current input, high-voltage direct current output, low-voltage direct current output, low-voltage signal module, in ac-dc conversion process, containing high-frequency control power MOS, transformer, inductance, etc., these main power components will produce electric field, magnetic field interference in power conversion process, these interferences will radiate through space, line end, so need AC input, HV output port processing, the usual practice is to increase filter components in AC input, HV output port, and this filter component needs to have a complete cavity for electromagnetic shielding, prevent electromagnetic interference.

[0003] As Figure 1 The main power component is usually arranged on the main power board 100, and the filter component is usually integrated on the filter board 200, the filter board 200 is separated from the main power board 100, and the filter board 200 is placed below the main power board 100. The filter board 200 and the main power board 100 are shielded by the metal shielding cover 300, but the filter board 200 needs to be connected between the filter board 200 and the main power board 100, considering the safety regulation avoidance and the connection avoidance, the shielding cover 300 has a plurality of avoidance holes 310, as shown in Figure 2 The electromagnetic interference cannot be effectively shielded, and there is electromagnetic interference with the main power board, thereby affecting the EMC performance of the whole machine. Utility model content

[0004] The utility model discloses a kind of EMC filter electromagnetic shielding structures with good electromagnetic shielding effect and vehicle charger using the above EMC filter electromagnetic shielding structure, to solve the problems that the prior art exists.

[0005] In the utility model embodiment, an EMC filter electromagnetic shielding structure is provided, which comprises: a casing, a shielding wall, a top cover arranged on the casing, a filter component and a main power component arranged in the casing, a filter cavity and a main power cavity separated by the shielding wall are arranged in the casing, the filter component is arranged in the filter cavity, the main power component is arranged in the main power cavity, and the shielding wall and the top cover are connected by metal with electromagnetic shielding effect.

[0006] The filter assembly and the main power assembly are arranged on different regions 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 the filter assembly and the main power assembly are separated in the filter cavity and the main power cavity.

[0007] In the embodiment of the utility model, the shielding wall and the shell are integrally formed.

[0008] The filter assembly and the main power assembly are arranged on different regions 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 the filter assembly and the main power assembly are separated in the filter cavity and the main power cavity.

[0009] In the embodiment of the utility model, the inner side of the top cover is provided with a convex rib corresponding to the position of the shielding wall, the convex rib and the PCB board are kept metal connection through the conductive body, and the shielding wall and the PCB board are kept metal connection through the conductive body.

[0010] In the embodiment of the utility model, the top cover and the shielding wall are kept metal connection through the conductive body.

[0011] In the embodiment of the utility model, the inner side of the top cover is provided with a groove corresponding to the shielding wall, and the shielding wall is inserted into the groove.

[0012] In the embodiment of the utility model, the inner side of the top cover is provided with a convex rib corresponding to the shielding wall, and the shielding wall and the convex rib are kept metal connection through the conductive body.

[0013] In the embodiment of the utility model, the top cover and the shielding wall are integrally formed.

[0014] In the embodiment of the utility model, the shielding wall and the shell are kept metal connection through the conductive body.

[0015] In the embodiment of the utility model, the shielding wall and the shell are kept metal connection through welding.

[0016] In the embodiment of the utility model, the top cover and the shielding wall are connected through welding.

[0017] The utility model discloses an EMC filter electromagnetic shielding structure, which comprises a shell, a filter assembly and a main power assembly.

[0018] The utility model discloses an EMC filter electromagnetic shielding structure, which comprises a shell, a filter assembly and a main power assembly.

[0019] Compared with the prior art, the EMC filter electromagnetic shielding structure of the utility model is provided with a shielding wall in the shell, the filter cavity and the main power cavity are separated by the shielding wall, the filter assembly is arranged in the filter cavity, and the main power assembly is arranged in the main power cavity, so that the filter assembly and the main power assembly are electromagnetically shielded. In addition, the top cover and the shielding wall are connected by metal and have electromagnetic shielding effect, which can better separate the filter cavity and the main power cavity and effectively prevent the electromagnetic interference of the main power assembly on the filter assembly. Furthermore, the filter assembly and the main power assembly are arranged in different areas of the same PCB, the PCB is provided with a slot corresponding to the shielding wall, the shielding wall passes through the slot, and the filter assembly and the main power assembly are separated in the filter cavity and the main power cavity. While improving the EMC shielding performance, the assembly process can be reduced, and the production cost can be reduced. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a three-dimensional structure schematic diagram of the EMC filter electromagnetic shielding structure of prior art.

[0021] Figure 2 It is a plane schematic diagram of the EMC filter electromagnetic shielding structure of prior art.

[0022] Figure 3 It is a three-dimensional structure schematic diagram of the EMC filter electromagnetic shielding structure of the utility model embodiment.

[0023] Figure 4 It is a three-dimensional structure schematic diagram of the shell of the utility model embodiment.

[0024] Figure 5 It is a plane structure schematic diagram of the EMC filter electromagnetic shielding structure of the utility model embodiment.

[0025] Figure 6It is a connection mode structure schematic view of the shielding wall and the top cover of the embodiment of the utility model.

[0026] Figure 7 It is a connection mode structure schematic view of the shielding wall and the top cover of the embodiment of the utility model.

[0027] Figure 8 It is a connection mode structure schematic view of the shielding wall and the top cover of the embodiment of the utility model.

[0028] Figure 9 It is a connection mode structure schematic view of the shielding wall and the top cover of the embodiment of the utility model.

[0029] Figure 10 It is a connection mode structure schematic view of the shielding wall and the top cover of the embodiment of the utility model.

[0030] Figure 11 It is a connection mode structure schematic view of the shielding wall and the top cover of the embodiment of the utility model.

[0031] Figure 12 It is the electromagnetic radiation waveform diagram of prior art.

[0032] Figure 13 It is the electromagnetic radiation waveform diagram of the embodiment of the utility model.

[0033] Figure 14 It is the plane structure schematic view of the EMC filtering electromagnetic shielding structure of another embodiment of the utility model. DETAILED DESCRIPTION

[0034] The EMC filtering electromagnetic shielding structure of the utility model is described below by taking the EMC filtering electromagnetic shielding structure of the vehicle-mounted charging machine as an example.

[0035] As Figures 3-5 shown, the utility model embodiment provides a kind of EMC filtering electromagnetic shielding structure, it includes: casing 1, top cover 2 being arranged on the casing 1 and shielding wall 11 being arranged between the casing 1 and the top cover 2.The casing 1 includes main power cavity 13 and filter cavity 14 separated by the shielding wall 11.The main power cavity 13 is provided with main power component 15, and the filter cavity 14 is provided with filter component 16.The filter component includes HV filter component and AC filter component.The casing 1 and the top cover 2 are metal material, to have electromagnetic shielding effect.

[0036] In the embodiment, two shielding walls 11 are arranged in the casing 1, and two filter cavities are arranged, i.e. an HV filter cavity and an AC filter cavity arranged on both sides of the main power cavity 13. The HV filter assembly is arranged in the HV filter cavity, and the AC filter assembly is arranged in the AC filter cavity. The top cover 2 is connected with the shielding wall 11 in a metal connection with an electromagnetic shielding effect, so that the filter assembly 16 and the main power assembly 15 are electromagnetically shielded, and electromagnetic interference of the main power assembly 15 on the filter assembly 16 is effectively prevented.

[0037] In the embodiment, the filter assembly 16 and the main power assembly 15 are arranged on the same PCB 3 and arranged in different regions corresponding to the main power cavity 13 and the filter cavity 14. The PCB 3 is provided with a slot 31 corresponding to the shielding wall 11 and a plurality of screw holes 32, and the casing 1 is further provided with a plurality of studs 17 corresponding to the screw holes 32. During assembly, the shielding wall 11 is inserted through the slot 31, the PCB 2 is arranged on the main power cavity 13 and the filter cavity 14, and the studs 17 are used for fixing, so that the filter assembly 16 and the main power assembly 15 are arranged in the filter cavity 14 and the main power cavity 13. The filter assembly 16 and the main power assembly 15 are arranged on the same PCB, which can improve the EMC shielding performance, reduce the assembly process, and reduce the production cost.

[0038] In the embodiment, the shielding wall 11 is made of metal, which can be fixed in the casing 1 by welding, and the shielding wall 11 can be integrally formed with the casing 1, so that better EMC shielding effect is achieved. In the embodiment, the top cover 2 and the shielding wall 11 can be connected in a metal connection by various ways.

[0039] As shown in FIG. 1, Figure 6 As shown in FIG. 1,

[0040] As shown in FIG. 1, Figure 7 As shown in FIG. 1,

[0041] As shown in FIG. 1, Figure 8As shown, in another preferred implementation, the inner side of the top cover 2 is provided with a rib 21 corresponding to the shielding wall 11, and the shielding wall 11 is metal-connected to the rib 22 through a conductor 4.

[0042] like Figure 9 As shown, in another preferred implementation, the top cover 2 and the shielding wall 11 are integrally formed, and the shielding wall 11 and the housing 1 are maintained in a metal connection by a conductor 4. The shielding wall 11 can also be maintained in a metal connection with the housing 1 by welding. Furthermore, the top cover 2 and the shielding wall 11 can also be connected by welding.

[0043] like Figure 10 As shown, in another preferred implementation, the PCB board 3 does not have a slot for the shielding wall 11 to pass through, and the inner side of the top cover 2 is provided with a rib 21 corresponding to the position of the shielding wall 11. The rib 21 and the PCB board 3 are kept in a metal connection through a conductor 4, and the shielding wall 11 and the PCB board 3 are kept in a metal connection through a conductor 4.

[0044] It should be noted that, in various ways the top cover 2 and the shielding wall 11 are connected by a conductor 4, the conductor 4 can be disposed at all connection points between the shielding wall 11 and the top cover 2, or it can be disposed in segments at the connection points between the shielding wall 11 and the top cover 2, such as... Figure 11 As shown.

[0045] Figure 12 These are EMC radiation test values ​​from existing technologies. Figure 13 The EMC radiation test values ​​are obtained by using the EMC filtering electromagnetic shielding structure of this utility model embodiment. It can be seen that, compared with the prior art, the EMC radiation test value is reduced by 10dBμV / m by using the EMC filtering electromagnetic shielding structure of this utility model embodiment, which has a better electromagnetic shielding effect.

[0046] like Figure 14 As shown, in another embodiment of this utility model, the filtering component is disposed on an EMC filtering circuit board 31, and the main power component is disposed on a main power circuit board 32. The EMC filtering circuit board 31 and the main power circuit board 32 are connected by a copper busbar 18 passing through the filtering cavity 16 and the main power cavity 15. The side walls of the filtering cavity 16 and the main power cavity 15 adjacent to the shielding wall 11 are provided with through holes for the copper busbar to pass through. The gap between the through hole and the copper busbar is sealed with conductive adhesive.

[0047] It should be noted that in the above embodiment, the filter assembly includes an HV filter assembly and an AC filter assembly, and two corresponding filter cavities are arranged in the shell through the shielding wall. In other embodiments, the filter assembly can be one or more filter assemblies, and the filter cavities in the shell can also be divided into one or more corresponding filter cavities by the shielding wall. Those skilled in the art can set it according to the specific circumstances, and the utility model does not limit this.

[0048] Further, the utility model discloses a kind of vehicle-mounted charger, it includes vehicle-mounted DCDC conversion module and the EMC filter electromagnetic shielding structure described above.

[0049] In conclusion, the EMC filter electromagnetic shielding structure of the utility model, the shell is provided with shielding wall, the shielding wall is separated from the main power cavity, the filter assembly is arranged in the filter cavity, the main power assembly is arranged in the main power cavity, so that the filter assembly and the main power assembly are electromagnetically shielded;In addition, the top cover and the shielding wall remain metal connection with electromagnetic shielding effect, can better divide the filter cavity and the main power cavity, effectively prevent the electromagnetic interference of the main power assembly to the filter assembly;Further, the filter assembly and the main power assembly are arranged in different regions on the same PCB, and the PCB is provided with slot corresponding to the shielding wall, and the shielding wall passes through the slot, and the filter assembly and the main power assembly are separated in the filter cavity and the main power cavity, while improving EMC shielding performance, can also reduce assembly process, reduce production cost.The above only is the preferred embodiment of the utility model, and does not limit the utility model, and any modification, equivalent replacement and improvement, etc. within the spirit and principle of the utility model, should be included in the protection scope of the utility model.

Claims

1. An EMC filtering electromagnetic shielding structure, characterized in that, include: The enclosure comprises a housing, a shielding wall, a top cover mounted on the housing, and a filter assembly and a main power assembly disposed within the housing. The housing 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 top cover are connected by a metal structure that provides electromagnetic shielding.

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, characterized in that, The filter component and the main power component are disposed in different areas of the same PCB board. The inner side of the top cover is provided with a rib corresponding to the position of the shielding wall. The rib is metal-connected to the PCB board through a conductor, and the shielding wall is metal-connected to the PCB board through a conductor.

4. The EMC filtering electromagnetic shielding structure as described in claim 1 or 2, characterized in that, The shielding wall is integrally formed with the casing.

5. The EMC filtering electromagnetic shielding structure as described in claim 4, characterized in that, The top cover and the shielding wall are connected by a conductor.

6. The EMC filtering electromagnetic shielding structure as described in claim 4, characterized in that, The inner side of the top cover is provided with a groove corresponding to the shielding wall, and the shielding wall is inserted into the groove.

7. The EMC filtering electromagnetic shielding structure as described in claim 4, characterized in that, The inner side of the top cover is provided with a rib corresponding to the shielding wall, and the shielding wall and the rib are connected by a conductor.

8. The EMC filtering electromagnetic shielding structure as described in claim 1 or 2, characterized in that, The top cover and the shielding wall are integrally formed.

9. The EMC filtering electromagnetic shielding structure as described in claim 8, characterized in that, The shielding wall and the casing are connected by a conductor to maintain a metallic connection.

10. The EMC filtering electromagnetic shielding structure as described in claim 8, characterized in that, The shielding wall and the casing are connected by welding to maintain a metal connection.

11. The EMC filtering electromagnetic shielding structure as described in claim 1 or 2, characterized in that, The top cover and the shielding wall are connected by welding.

12. The EMC filtering electromagnetic shielding structure as described in claim 1 or 2, characterized in that, The filtering component is mounted on an EMC filtering circuit board, and the main power component is mounted 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.

13. 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 1-12.

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