Direct current filtering structure
By integrating multiple filter devices in the DC filter structure, the existing filter structure has large space requirements and cumbersome installation problems are solved, and efficient filtering capabilities and low-cost production are achieved.
Patent Information
- Application Number
- CN202422141934.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-31
- Publication Date
- 2025-07-22
- Estimated Expiration
- 2034-08-31
AI Technical Summary
When the existing filter structure is at a high filter level, the installation space needs are large, the integration is low, the installation is cumbersome, the production efficiency is low, and the cost is high.
Multiple filter devices are integrated together, including the DC high-voltage busbar, primary filter assembly, secondary filter assembly and membrane capacitor in the housing. The connection between the components is achieved through removable connection and fastener. The fuse is used to connect the copper bar and the PCB board integrated capacitor. The interference-removing parts are nanocrystalline magnetic ring and ferrite core.
Improve filtering capacity in limited space, reduce installation time, reduce production costs, meet the needs of EMC test level 5, and improve production rhythm.
Smart Images
Figure CN223141892U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of filtering, and particularly relates to a DC filtering structure. Background Art
[0002] When designing the current common filtering structure, several filtering components such as filtering capacitors, magnetic rings, and magnetic cores are added to the current transmission path. Traditional filtering components are all independent individuals. When the filtering level is high and there are many filtering devices, the required installation space becomes larger, the integration level is low, the installation is cumbersome, and the production efficiency is low.
[0003] In order to solve the above problems, the utility model provides a filtering structure, which can integrate multiple filtering devices together, ensure the volume utilization rate of the filtering components, maximize the DC-side filtering ability of the controller, reduce the installation time of the filtering devices, improve the production beat, and reduce the production cost. Summary of the Utility Model
[0004] In view of the above problems, the utility model provides a DC filtering structure, including a housing. A DC high-voltage bus is provided on the housing. An first-level filtering component, a second-level filtering component and a thin-film capacitor are sequentially arranged in the housing along the vertical direction. A detachable fuse is provided on the first-level filtering component. The input end of the DC high-voltage bus is detachably connected to the input end of the first-level filtering component. The output end of the first-level filtering component is detachably connected to the input end of the second-level filtering component. The output end of the second-level filtering component is detachably connected to the thin-film capacitor. Both the first-level filtering component and the second-level filtering component are connected to the housing through fasteners.
[0005] Further, the first-level filtering component includes a first integrated structure. A fuse connection copper bar, a first positive copper bar and a first negative copper bar are sequentially arranged on the first integrated structure along the horizontal direction. A grounding copper bar a and a grounding copper bar b are sequentially arranged along the horizontal direction on the side of the first integrated structure away from the fuse connection copper bar. The fuse is arranged on the fuse connection copper bar. The positive input end of the DC high-voltage bus is connected to the input end of the first positive copper bar. The output end of the first positive copper bar is connected to the positive input end of the second-level filtering component. The negative input end of the DC high-voltage bus is connected to the input end of the first negative copper bar. The output end of the first negative copper bar is connected to the negative input end of the second-level filtering component.
[0006] Further, the first integrated structure includes a first-level filtering housing, a first PCB board and a first-level filtering capacitor. The first-level filtering housing is internally provided with the first PCB board. The first PCB board is provided with the first-level filtering capacitor. The first positive copper bar, the first negative copper bar, the grounding copper bar a and the grounding copper bar b are all electrically connected to the first-level filtering capacitor.
[0007] Further, the primary filtering capacitor includes a first X capacitor and a first Y capacitor that are electrically connected in sequence. On one side of the first PCB board close to the inner cavity of the primary filtering housing, the first X capacitor and the first Y capacitor are arranged in sequence horizontally. Both the first positive copper busbar and the first negative copper busbar are connected to the first X capacitor, and the first positive copper busbar, the first negative copper busbar, and the grounding copper busbar a are all connected to the first Y capacitor.
[0008] Further, the first Y capacitor includes a first Y capacitor a and a first Y capacitor b that are arranged vertically along the first PCB board in sequence. The first positive copper busbar and the grounding copper busbar a are both connected to the first Y capacitor a, and the first negative copper busbar and the grounding copper busbar b are both connected to the first Y capacitor b.
[0009] Further, the secondary filtering component includes a second integrated structure. A noise elimination component is provided on the second integrated structure. A second negative copper busbar passing through the noise elimination component is provided on one side of the second integrated structure. A second positive copper busbar passing through the noise elimination component is provided at a position of the second integrated structure close to the second negative copper busbar. On the side of the second integrated structure close to the second positive copper busbar, a first grounding copper busbar and a second grounding copper busbar are arranged vertically in sequence. The second negative copper busbar, the second positive copper busbar, the first grounding copper busbar, and the second grounding copper busbar are all electrically connected to the second integrated structure. The input end of the second positive copper busbar is connected to the output end of the first positive copper busbar, the input end of the second negative copper busbar is connected to the output end of the first negative copper busbar, and the output ends of the second positive copper busbar and the second negative copper busbar are both connected to the thin film capacitor.
[0010] Further, the noise elimination component includes a nanocrystalline magnetic ring and a ferrite magnetic core that are arranged vertically along the second integrated structure in sequence. Inside the second integrated structure, a ferrite magnetic core and a nanocrystalline magnetic ring are arranged vertically in sequence. On the side of the second integrated structure adjacent to the primary filtering component, a second negative copper busbar passing through the nanocrystalline magnetic ring and the ferrite magnetic core in sequence is provided. At a position of the second integrated structure close to the second negative copper busbar, a second positive copper busbar passing through the nanocrystalline magnetic ring and the ferrite magnetic core in sequence is provided.
[0011] Further, the second integrated structure includes a secondary filtering housing, a second PCB board, a secondary filtering capacitor, and a tertiary filtering capacitor. A second PCB board is provided inside the secondary filtering housing. The secondary filtering capacitor and the tertiary filtering capacitor that are electrically connected are arranged horizontally in sequence on the second PCB board. On the side of the secondary filtering housing adjacent to the primary filtering component, a second negative copper busbar and a second positive copper busbar are arranged horizontally in sequence. The first grounding copper busbar and the second grounding copper busbar are sequentially arranged on the side of the secondary filtering housing close to the second positive copper busbar. The second positive copper busbar, the second negative copper busbar, the first grounding copper busbar, and the second grounding copper busbar are all electrically connected to the secondary filtering capacitor. The second positive copper busbar, the second negative copper busbar, the first grounding copper busbar, and the second grounding copper busbar are all electrically connected to the tertiary filtering capacitor.
[0012] Further, the secondary filtering capacitor includes a second X capacitor, a second Y capacitor, and a third Y capacitor. On the second PCB board, at positions close to the second negative copper row and the second positive copper row, the second Y capacitor, the third Y capacitor, and the second X capacitor are sequentially arranged vertically. The second Y capacitor and the third Y capacitor are arranged in parallel. Both the second Y capacitor and the third Y capacitor are connected to the second X capacitor, and the second Y capacitor is electrically connected to the third Y capacitor.
[0013] Further, the tertiary filtering capacitor includes a third X capacitor, a fourth Y capacitor, a fourth X capacitor, and a fifth Y capacitor. On one side of the PCB board close to the first grounding copper row, the fourth Y capacitor, the fourth X capacitor, the third X capacitor, and the fifth Y capacitor are sequentially arranged vertically. The third X capacitor and the fifth Y capacitor are arranged in parallel, and the fourth Y capacitor and the fourth X capacitor are arranged in parallel.
[0014] Compared with the prior art, the beneficial effects of the present utility model are as follows:
[0015] 1) The present utility model can integrate multiple filtering devices through the primary filtering component and the secondary filtering component within a limited space, ensuring the volume utilization rate of the filtering component, maximizing the filtering ability of the DC end of the controller, reducing the installation time of the filtering devices, improving the production beat, and reducing the production cost.
[0016] 2) The fuse connection copper row in the present utility model provides a fixing seat function for the fuse and integrates the fuse installation structure, saving time.
[0017] 3) Both the first PCB board and the second PCB board of the present utility model integrate multiple capacitors, eliminating the traditional resistance welding process, saving the assembly time, reducing the volume, and increasing the space utilization rate.
[0018] 4) The present utility model constitutes a tertiary filtering structure by the primary filtering component and the secondary filtering component, which can meet the requirements of EMC test level 5.
[0019] 5) The installation methods of the primary filtering component, the secondary filtering component, and the fuse, as well as the connection methods between the parts in the present utility model are detachable. Therefore, different filtering capacitors can be disassembled and assembled according to requirements, reducing the production cost of the mold.
[0020] Other features and advantages of the present utility model will be described in the subsequent description, and some will become obvious from the description, or can be understood by implementing the present utility model. The objectives and other advantages of the present utility model can be achieved and obtained through the structures pointed out in the description, claims, and drawings. Description of the Drawings
[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.
[0022] Figure 1 Shows a structural schematic diagram according to an embodiment of the present invention;
[0023] Figure 2 Shows a structural schematic diagram of a primary filtering component;
[0024] Figure 3 Shows Figure 2 The sectional view taken along A - A in
[0025] Figure 4 Shows a structural schematic diagram of a first Y capacitor;
[0026] Figure 5 Shows a structural schematic diagram of a ground copper bar a and a ground copper bar b;
[0027] Figure 6 Shows a structural schematic diagram of a secondary filtering component;
[0028] Figure 7 Shows Figure 6 The rear view of
[0029] Figure 8 Shows Figure 7 The sectional view taken along B - B in
[0030] Reference numerals: 1, housing; 2, DC high-voltage bus; 21, positive input terminal; 22, negative input terminal; 3, primary filtering component; 31, primary filtering housing; 32, first PCB board; 33, primary filtering capacitor; 331, first X capacitor; 332, first Y capacitor; 3321, first Y capacitor a; 3322, first Y capacitor b; 34, first negative copper busbar; 35, first positive copper busbar; 36, input copper busbar; 37, output copper busbar; 38, grounding copper busbar a; 39, grounding copper busbar b; 4, secondary filtering component; 41, secondary filtering housing; 42, second PCB board; 43, secondary filtering capacitor; 431, second X capacitor; 432, second Y capacitor; 4321, second Y capacitor a; 4322, second Y capacitor b; 433, third Y capacitor; 4331, third Y capacitor a; 4332, third Y capacitor b; 44, tertiary filtering capacitor; 441, third X capacitor; 442, fourth Y capacitor; 4421, fourth Y capacitor a; 4422, fourth Y capacitor b; 443, fourth X capacitor; 444, fifth Y capacitor; 4441, fifth Y capacitor a; 4442, fifth Y capacitor b; 45, second positive copper busbar; 46, second negative copper busbar; 47, first grounding copper busbar; 48, second grounding copper busbar; 5, nanocrystalline magnetic ring; 6, ferrite core; 7, thin-film capacitor; 8, fuse. Detailed implementation manners
[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.
[0032] Figure 1 Shows a structural schematic diagram according to an embodiment of the present utility model. As Figure 1 shown, a DC filtering structure includes a housing 1, a DC high-voltage bus 2 is provided on the housing 1, the DC high-voltage bus 2, a primary filtering component 3, a secondary filtering component 4, and a thin-film capacitor 7 are sequentially arranged vertically in the housing 1, a detachable fuse 8 is provided on the primary filtering component 3, the input end of the DC high-voltage bus 2 is detachably connected to the input end of the primary filtering component 3, the output end of the primary filtering component 3 is detachably connected to the input end of the secondary filtering component 4, the output end of the secondary filtering component 4 is detachably connected to the thin-film capacitor 7, and both the primary filtering component 3 and the secondary filtering component 4 are connected to the housing 1 through fasteners.
[0033] The DC filtering structure integrates multiple filtering devices through a first-stage filtering component 3 and a second-stage filtering component 4. The first-stage filtering component 3 and the second-stage filtering component 4 are detachable, which not only ensures the volume utilization rate of the filtering component, but also maximally improves the filtering capacity at the DC end of the controller. At the same time, it reduces the installation time of the filtering devices, improves the production beat, and reduces the production cost.
[0034] Figure 2 The structural schematic diagram of the first-stage filtering component 3 is shown. As Figure 2 shown, in some embodiments, the first-stage filtering component 3 includes a first integrated structure. Along the horizontal direction, a fuse connection copper bar, a first positive copper bar 35, and a first negative copper bar 34 are sequentially arranged on the first integrated structure. On the side of the first integrated structure away from the fuse connection copper bar, a ground copper bar a38 and a ground copper bar b39 are sequentially arranged along the horizontal direction. The fuse 8 is arranged on the fuse connection copper bar. The positive input terminal 21 of the DC high-voltage bus 2 is connected to the input terminal of the first positive copper bar 35. The output terminal of the first positive copper bar 35 is connected to the positive input terminal of the second-stage filtering component 4. The negative input terminal 22 of the DC high-voltage bus 2 is connected to the input terminal of the first negative copper bar 34. The output terminal of the first negative copper bar 34 is connected to the negative input terminal of the second-stage filtering component 4. The first integrated structure provides installation conditions for the fuse connection copper bar, the first positive copper bar 35, and the first negative copper bar 34 and provides a current transmission path for the first positive copper bar 35 and the first negative copper bar 34. The first positive copper bar 35 and the first negative copper bar 34 play a role in transmitting current. The fuse connection copper bar provides an installation condition for the fuse 8.
[0035] Specifically, the fuse connection copper bar, the first positive copper bar 35, and the first negative copper bar 34 are fixed to the first integrated structure by an injection molding integrated method, which ensures the volume utilization rate of the filtering component.
[0036] In some embodiments, the fuse connection copper bar includes an input copper bar 36 and an output copper bar 37. Along the vertical direction, the input copper bar 36 and the output copper bar 37 are sequentially arranged on the first integrated structure. One end of the fuse 8 is arranged on the input copper bar 36, and the other end of the fuse 8 is arranged on the output copper bar 37. The input copper bar 36 and the output copper bar 37 provide an installation condition for the fuse 8, which ensures the volume utilization rate of the filtering component.
[0037] Specifically, the fuse 8 is connected to the input copper bar 36 and the output copper bar 37 by screws.
[0038] In some embodiments, the first integrated structure includes a primary filtering housing 31, a first PCB board 32, and primary filtering capacitors 33. The primary filtering housing 31 houses the first PCB board 32, and the first PCB board 32 is provided with primary filtering capacitors 33. The first positive copper busbar 35, the first negative copper busbar 34, the grounding copper busbar a38, and the grounding copper busbar b39 are all electrically connected to the primary filtering capacitors 33. The primary filtering housing 31 provides an installation condition for the first PCB board 32. The first PCB board 32 is used to integrate the primary filtering capacitors 33, ensuring the volume utilization rate of the filtering component.
[0039] Figure 3 shows Figure 2 the sectional view taken along A - A in Figure 4 shows the structural schematic diagram of the first Y capacitor 332; as Figures 3 - 4 shown, in some embodiments, the primary filtering capacitors 33 include a first X capacitor 331 and a first Y capacitor 332 that are electrically connected in sequence. On one side of the first PCB board 32 close to the inner cavity of the primary filtering housing 31, the first X capacitor 331 and the first Y capacitor 332 are arranged horizontally in sequence. The first positive copper busbar 35 and the first negative copper busbar 34 are both connected to the first X capacitor 331, and the first positive copper busbar 35, the first negative copper busbar 34, and the grounding copper busbar a38 are all connected to the first Y capacitor 332. The first X capacitor 331 functions to eliminate the common - mode interference in the power grid, and the second Y capacitor 432 and the third Y capacitor 433 function to eliminate the electromagnetic interference between the internal power grid and the external power grid of the primary filtering component 3, as well as to suppress the common - mode interference.
[0040] Figure 5 shows the structural schematic of the grounding copper busbar a38 and the grounding copper busbar b39; as Figure 5 shown, in some embodiments, the first Y capacitor 332 includes a first Y capacitor a3321 and a first Y capacitor b3322 that are arranged vertically along the first PCB board 32 in sequence. The first positive copper busbar 35 and the grounding copper busbar a38 are both connected to the first Y capacitor a3321, and the first negative copper busbar 34 and the grounding copper busbar b39 are both connected to the first Y capacitor b3322. The first Y capacitor a3321 and the first Y capacitor b3322 function to eliminate the electromagnetic interference between the internal power grid and the external power grid of the primary filtering component 3, as well as to suppress the common - mode interference.
[0041] Figure 6 shows the structural schematic diagram of the secondary filtering component 4; Figure 7 shows Figure 6 the rear view of Figures 6 - 7As shown, in some embodiments, the secondary filtering component 4 includes a second integrated structure, on which an interference eliminating component is provided. On one side of the second integrated structure, there is a second negative copper row 46 passing through the interference eliminating component. At a position of the second integrated structure close to the second negative copper row 46, there is a second positive copper row 45 passing through the interference eliminating component. Along the vertical direction in sequence on one side of the second integrated structure close to the second positive copper row 45, there are a first grounding copper row 47 and a second grounding copper row 48. The second negative copper row 46, the second positive copper row 45, the first grounding copper row 47, and the second grounding copper row 48 are all electrically connected to the second integrated structure. The input end of the second positive copper row 45 is connected to the output end of the first positive copper row 35, the input end of the second negative copper row 46 is connected to the output end of the first negative copper row 34, and the output ends of the second positive copper row 45 and the second negative copper row 46 are both connected to the thin film capacitor 7. The second integrated structure provides a setting condition for the interference eliminating component, the second positive copper row 45, the second negative copper row 46, the first grounding copper row 47, and the third grounding copper row. The second integrated structure provides a current transmission path for the second positive copper row 45, the second negative copper row 46, the first grounding copper row 47, and the second grounding copper row 48. The second positive copper row 45, the second negative copper row 46, the first grounding copper row 47, and the second grounding copper row 48 play a role in transmitting current.
[0042] Figure 8 is shown Figure 7 the cross-sectional view taken along B - B in Figure 8 As shown, in some embodiments, the interference eliminating component includes a nanocrystalline magnetic ring 5 and a ferrite core 6 arranged in sequence along the vertical direction of the second integrated structure. Inside the second integrated structure, there are a ferrite core 6 and a nanocrystalline magnetic ring 5 arranged in sequence along the vertical direction. On the side of the second integrated structure adjacent to the primary filtering component 3, there is a second negative copper row 46 passing through the nanocrystalline magnetic ring 5 and the ferrite core 6 in sequence. At a position of the second integrated structure close to the second negative copper row 46, there is a second positive copper row 45 passing through the nanocrystalline magnetic ring 5 and the ferrite core 6 in sequence. The second negative copper row 46 and the second positive copper row both pass through the nanocrystalline magnetic ring and the ferrite core 6 in sequence, so that electromagnetic interference can be eliminated during the use of the DC filtering structure.
[0043] In some embodiments, the second integrated structure includes a secondary filtering housing 41, a second PCB board 42, secondary filtering capacitors 43, and tertiary filtering capacitors 44. A second PCB board 42 is provided inside the secondary filtering housing 41. The secondary filtering capacitors 43 and the tertiary filtering capacitors 44 are electrically connected in sequence along the horizontal direction on the second PCB board 42. On one side of the secondary filtering housing 41 adjacent to the primary filtering assembly 3, a second negative copper row 46 and a second positive copper row 45 are arranged in sequence along the horizontal direction. A first grounding copper row 47 and a second grounding copper row 48 are sequentially arranged on one side of the secondary filtering housing 41 close to the second positive copper row 45. The second positive copper row 45, the second negative copper row 46, the first grounding copper row 47, and the second grounding copper row 48 are all electrically connected to the secondary filtering capacitors 43. The second positive copper row 45, the second negative copper row 46, the first grounding copper row 47, and the second grounding copper row 48 are all electrically connected to the tertiary filtering capacitors 44. The secondary filtering housing 41 provides an installation carrier for the PCB board, the secondary filtering capacitors 43, and the tertiary filtering capacitors 44. The PCB board is used to integrate the secondary filtering capacitors 43 and the tertiary filtering capacitors 44, ensuring the volume utilization rate of the filtering assembly.
[0044] In some embodiments, the secondary filtering capacitors 43 include a second X capacitor 431, a second Y capacitor 432, and a third Y capacitor 433. The second Y capacitor 432, the third Y capacitor 433, and the second X capacitor 431 are arranged in sequence along the vertical direction at positions on the second PCB board 42 close to the second negative copper row 46 and the second positive copper row 45. The second Y capacitor 432 and the third Y capacitor 433 are arranged in parallel. The second Y capacitor 432 and the third Y capacitor 433 are both connected to the second X capacitor 431. The second Y capacitor 432 is connected to the third Y capacitor 433. The second X capacitor 431 functions to eliminate common-mode interference in the power grid. The second Y capacitor 432 and the third Y capacitor 433 function to eliminate electromagnetic interference between the internal power grid and the external power grid of the primary filtering assembly 3, and to suppress common-mode interference.
[0045] Specifically, both the second positive copper row 45 and the second negative copper row 46 are electrically connected to the second X capacitor 431.
[0046] Specifically, the second positive copper row 45, the second negative copper row 46, the first grounding copper row 47, and the third grounding copper are all connected to the second Y capacitor 432.
[0047] Specifically, the second positive copper row 45, the second negative copper row 46, the first grounding copper row 47, and the third grounding copper are all connected to the third Y capacitor 433.
[0048] In some embodiments, the second Y capacitor 432 includes a second Y capacitor a 4321 and a second Y capacitor b 4322. The second Y capacitor a 4321 and the second Y capacitor b 4322 are arranged vertically in sequence on the second PCB board 42. The second positive copper busbar 45, the second negative copper busbar 46, and the second grounding copper busbar 48 are all connected to the second Y capacitor a 4321, and the second positive copper busbar 45, the second negative copper busbar 46, and the second grounding copper are all connected to the second Y capacitor b 4322. The second Y capacitor a 4321 and the second Y capacitor b 4322 function to eliminate electromagnetic interference between the internal power grid and the external power grid within the first-stage filtering component 3, and to suppress common-mode interference.
[0049] In some embodiments, the third Y capacitor 433 includes a third Y capacitor a 4331 and a third Y capacitor b 4332. The third Y capacitor a 4331 and the third Y capacitor b 4332 are arranged vertically in sequence at a position on the second PCB board 42 close to the first grounding copper busbar 47. The second positive copper busbar 45, the second negative copper busbar 46, and the second grounding copper busbar 48 are all connected to the third Y capacitor a 4331, and the second positive copper busbar 45, the second negative copper busbar 46, and the second grounding copper are all connected to the third Y capacitor b 4332. The third Y capacitor a 4331 and the third Y capacitor b 4332 function to eliminate electromagnetic interference between the internal power grid and the external power grid within the first-stage filtering component 3, and to suppress common-mode interference.
[0050] In some embodiments, the three-stage filtering capacitor 44 includes a third X capacitor 441, a fourth Y capacitor 442, a fourth X capacitor 443, and a fifth Y capacitor 444. The fourth Y capacitor 442, the fourth X capacitor 443, the third X capacitor 441, and the fifth Y capacitor 444 are arranged vertically in sequence on one side of the PCB board close to the first grounding copper busbar 47. The third X capacitor 441 and the fifth Y capacitor 444 are arranged in parallel, and the fourth Y capacitor 442 and the fourth X capacitor 443 are arranged in parallel. The third X capacitor 441 and the fourth X capacitor 443 function to eliminate common-mode interference in the power grid, and the fourth Y capacitor 442 and the fifth Y capacitor 444 function to eliminate electromagnetic interference between the internal power grid and the external power grid within the first-stage filtering component 3, and to suppress common-mode interference.
[0051] Specifically, both the second positive copper busbar 45 and the second negative copper busbar 46 are electrically connected to the third X capacitor 441.
[0052] Specifically, the second positive copper busbar 45, the second negative copper busbar 46, the first grounding copper busbar 47, and the third grounding copper are all connected to the fourth Y capacitor 442.
[0053] Specifically, the second positive copper busbar 45, the second negative copper busbar 46, the first grounding copper busbar 47, and the third grounding copper are all connected to the fifth Y capacitor 444.
[0054] In some embodiments, the fourth Y-capacitor 442 includes a fourth Y-capacitor a 4421 and a fourth Y-capacitor b 4422. At a position of the second PCB board 42 close to the first ground copper bar 47, the fourth Y-capacitor a 4421 and the fourth Y-capacitor b 4422 are arranged in sequence vertically. The second positive copper bar 45, the second negative copper bar 46, and the second ground copper bar 48 are all electrically connected to the fourth Y-capacitor b 4422, and the second positive copper bar 45, the second negative copper bar 46, and the first ground copper bar 47 are all electrically connected to the fourth Y-capacitor a 4421. The fourth Y-capacitor a 4421 and the fourth Y-capacitor b 4422 function to eliminate electromagnetic interference between the internal power grid and the external power grid within the first-stage filtering component 3 and to suppress common-mode interference.
[0055] In some embodiments, the fifth Y-capacitor 444 includes a fifth Y-capacitor a 4441 and a fifth Y-capacitor b 4442. At a position of the second PCB board 42 close to the second ground copper bar 48, the fifth Y-capacitor a 4441 and the fifth Y-capacitor b 4442 are arranged in sequence vertically. The second positive copper bar 45, the second negative copper bar 46, and the second ground copper bar 48 are all connected to the fifth Y-capacitor b 4442, and the second positive copper bar 45, the second negative copper bar 46, and the second ground copper bar 48 are all connected to the fifth Y-capacitor a 4441. The fifth Y-capacitor a 4441 and the fifth Y-capacitor b 4442 function to eliminate electromagnetic interference between the internal power grid and the external power grid within the first-stage filtering component 3 and to suppress common-mode interference.
[0056] The working principle of the DC filtering structure is as follows:
[0057] By integrating multiple filtering devices and making them detachably connected, the volume utilization rate of the filtering component is ensured, the filtering capacity at the DC end of the controller is maximally improved, the installation time of the filtering devices is reduced, the production tempo is increased, and the production cost is lowered. Among them, the first positive copper bar 35 of the first-stage filtering component 3 is connected to the positive input end 21 of the DC high-voltage bus 2 by screws, and then the first negative copper bar 34 of the first-stage filtering component 3 is connected to the negative input end 22 of the DC high-voltage bus 2 by screws. Then, the other end of the first negative copper bar 34 of the first-stage filtering component 3 is connected to the second negative copper bar 46 in the second-stage filtering component 4 by screws, and the other end of the first positive copper bar 35 of the first-stage filtering component 3 is connected to the second positive copper bar 45 in the second-stage filtering component 4 by screws. Then, the other end of the second negative copper bar 46 in the second-stage filtering component 4 is connected to the thin-film capacitor 7 by screws, and the other end of the second negative copper bar 46 in the second-stage filtering component 4 is connected to the thin-film capacitor 7 by screws. Then, the fuse 8 is installed on the first-stage filtering component 3 to complete the installation. Since the first-stage filtering component 3 and the second-stage filtering component 4 are already integrated, the installation on the housing 1 can ensure the volume utilization rate of the filtering component and maximally improve the filtering capacity at the DC end of the controller. Also, because of the detachable installation by screws, the installation time of the filtering devices is reduced, the production tempo is increased, and the production cost is lowered.
[0058] Although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present utility model.
Claims
1. A DC filtering structure, characterized in that, It includes a housing (1) provided with a DC high-voltage bus bar (2). Inside the housing (1), a primary filtering component (3), a secondary filtering component (4), and a thin-film capacitor (7) are sequentially arranged vertically. A detachable fuse (8) is provided on the primary filtering component (3). The input end of the DC high-voltage bus bar (2) is detachably connected to the input end of the primary filtering component (3). The output end of the primary filtering component (3) is detachably connected to the input end of the secondary filtering component (4). The output end of the secondary filtering component (4) is detachably connected to the thin-film capacitor (7). Both the primary filtering component (3) and the secondary filtering component (4) are connected to the housing (1) through fasteners.
2. The DC filtering structure according to claim 1, wherein The primary filtering component (3) includes a first integrated structure. Along the transverse direction on the first integrated structure, a fuse connection copper bar, a first positive copper bar (35), and a first negative copper bar (34) are sequentially arranged. On the side of the first integrated structure away from the fuse connection copper bar, a ground copper bar a (38) and a ground copper bar b (39) are sequentially arranged along the transverse direction. The fuse (8) is arranged on the fuse connection copper bar. The positive input end (21) of the DC high-voltage bus bar (2) is connected to the input end of the first positive copper bar (35). The output end of the first positive copper bar (35) is connected to the positive input end of the secondary filtering component (4). The negative input end (22) of the DC high-voltage bus bar (2) is connected to the input end of the first negative copper bar (34). The output end of the first negative copper bar (34) is connected to the negative input end of the secondary filtering component (4).
3. The DC filtering structure according to claim 2, wherein The first integrated structure includes a primary filtering housing (31), a first PCB board (32), and a primary filtering capacitor (33). Inside the primary filtering housing (31), a first PCB board (32) is provided. On the first PCB board (32), a primary filtering capacitor (33) is provided. The first positive copper bar (35), the first negative copper bar (34), the ground copper bar a (38), and the ground copper bar b (39) are all electrically connected to the primary filtering capacitor (33).
4. The DC filtering structure according to claim 3, characterized in that, The primary filtering capacitor (33) includes a first X capacitor (331) and a first Y capacitor (332) which are electrically connected in sequence. On the side of the first PCB board (32) close to the inner cavity of the primary filtering housing (31), a first X capacitor (331) and a first Y capacitor (332) are sequentially arranged along the transverse direction. The first positive copper bar (35) and the first negative copper bar (34) are both connected to the first X capacitor (331). The first positive copper bar (35), the first negative copper bar (34), and the ground copper bar a (38) are all connected to the first Y capacitor (332).
5. The DC filtering structure according to claim 4, characterized in that The first Y capacitor (332) includes a first Y capacitor a (3321) and a first Y capacitor b (3322) which are sequentially arranged vertically along the first PCB board (32). The first positive copper bar (35) and the ground copper bar a (38) are both connected to the first Y capacitor a (3321). The first negative copper bar (34) and the ground copper bar b (39) are both connected to the first Y capacitor b (3322).
6. The DC filtering structure according to claim 1, characterized in that, The secondary filtering component (4) includes a second integrated structure, on which an interference elimination component is provided. On one side of the second integrated structure, there is a second negative copper row (46) passing through the interference elimination component. At a position of the second integrated structure close to the second negative copper row (46), there is a second positive copper row (45) passing through the interference elimination component. On one side of the second integrated structure close to the second positive copper row (45), a first grounding copper row (47) and a second grounding copper row (48) are successively arranged vertically. The second negative copper row (46), the second positive copper row (45), the first grounding copper row (47), and the second grounding copper row (48) are all electrically connected to the second integrated structure. The input end of the second positive copper row (45) is connected to the output end of the first positive copper row (35), the input end of the second negative copper row (46) is connected to the output end of the first negative copper row (34), and the output ends of the second positive copper row (45) and the second negative copper row (46) are both connected to the thin film capacitor (7).
7. The DC filtering structure according to claim 6, wherein The interference elimination component includes a nanocrystalline magnetic ring (5) and a ferrite magnetic core (6) successively arranged vertically on the second integrated structure. Inside the second integrated structure, a ferrite magnetic core (6) and a nanocrystalline magnetic ring (5) are successively arranged vertically. On one side of the second integrated structure adjacent to the primary filtering component (3), there is a second negative copper row (46) successively passing through the nanocrystalline magnetic ring (5) and the ferrite magnetic core (6). At a position of the second integrated structure close to the second negative copper row (46), there is a second positive copper row (45) successively passing through the nanocrystalline magnetic ring (5) and the ferrite magnetic core (6).
8. The DC filtering structure according to claim 7, wherein The second integrated structure includes a secondary filtering shell (41), a second PCB board (42), a secondary filtering capacitor (43), and a tertiary filtering capacitor (44). Inside the secondary filtering shell (41), there is a second PCB board (42). On the second PCB board (42), a secondary filtering capacitor (43) and a tertiary filtering capacitor (44) electrically connected to each other are successively arranged horizontally. On one side of the secondary filtering shell (41) adjacent to the primary filtering component (3), a second negative copper row (46) and a second positive copper row (45) are successively arranged horizontally. The first grounding copper row (47) and the second grounding copper row (48) are successively arranged on one side of the secondary filtering shell (41) close to the second positive copper row (45). The second positive copper row (45), the second negative copper row (46), the first grounding copper row (47), and the second grounding copper row (48) are all electrically connected to the secondary filtering capacitor (43). The second positive copper row (45), the second negative copper row (46), the first grounding copper row (47), and the second grounding copper row (48) are all electrically connected to the tertiary filtering capacitor (44).
9. The DC filtering structure according to claim 8, wherein The secondary filter capacitor (43) includes a second X capacitor (431), a second Y capacitor (432), and a third Y capacitor (433). On the second PCB board (42), in the areas near the second negative copper busbar (46) and the second positive copper busbar (45), the second Y capacitor (432), the third Y capacitor (433), and the second X capacitor (431) are arranged in sequence vertically. The second Y capacitor (432) and the third Y capacitor (433) are arranged in parallel. Both the second Y capacitor (432) and the third Y capacitor (433) are connected to the second X capacitor (431), and the second Y capacitor (432) is electrically connected to the third Y capacitor (433).
10. The DC filtering structure according to claim 8, wherein The tertiary filter capacitor (44) includes a third X capacitor (441), a fourth Y capacitor (442), a fourth X capacitor (443), and a fifth Y capacitor (444). On one side of the PCB board near the first grounding copper busbar (47), the fourth Y capacitor (442), the fourth X capacitor (443), the third X capacitor (441), and the fifth Y capacitor (444) are arranged in sequence vertically. The third X capacitor (441) and the fifth Y capacitor (444) are arranged in parallel, and the fourth Y capacitor (442) and the fourth X capacitor (443) are arranged in parallel.