A DC-end multi-stage filter structure, motor controller and vehicle

Abstract

The present invention discloses a DC-end multi-stage filter structure, a motor controller and a vehicle. The DC-end multi-stage filter structure is fixed to the DC end in the controller housing. The head end of the DC end is a high-voltage busbar, and the end end is a film capacitor. The DC end includes a primary filter fixing seat assembly and a secondary filter fixing seat assembly. The primary filter fixing seat assembly and the secondary filter fixing seat assembly are arranged in a line along the length direction of the controller housing in the controller housing; the input end of the high-voltage busbar is correspondingly connected to the positive and negative input ends of the primary filter fixing seat assembly; the positive and negative output ends of the primary filter fixing seat assembly are respectively correspondingly connected to the positive and negative input ends of the secondary filter fixing seat assembly; the positive and negative output ends of the secondary filter fixing seat assembly are respectively correspondingly connected to the positive and negative input ends of the film capacitor. By integrating and modularizing a plurality of filter components together, it can be ensured that the EMC capability of the controller DC end is maximized within a limited space.

Description

Technical Field

[0001] The present invention relates to the technical field of motor controllers, and in particular to a DC-end multi-stage filter structure, a motor controller having the DC-end multi-stage filter structure, and a vehicle having the motor controller. Background Art

[0002] Electromagnetic compatibility (EMC) refers to the ability of a device or system to work normally in its electromagnetic environment and not cause any electromagnetic disturbance that cannot be tolerated by anything in the environment. According to the definition of EMC, electronic equipment must meet EMC design indicators. On the one hand, it is necessary to ensure that the electronic equipment has a certain degree of immunity to the electromagnetic interference in the environment in which it is located, and on the other hand, it is required that the electromagnetic interference generated by the electronic equipment to the environment in the process of operation does not exceed the specified limit.

[0003] The automotive motor controller is a typical electronic device, on which electronic components such as connecting wiring harnesses, PCBs, power modules and capacitor modules are arranged. When designing an EMC solution, the general design idea is to add filtering components such as magnetic rings and magnetic buckles at the DC end and the three-phase end, and to add filtering capacitors, shielding covers, grounding designs and other measures to the filter PCB on the transmission path. In order to meet the EMC design indicators, as many filtering components as possible are arranged in a limited space to improve the filtering level.

[0004] When designing the EMC of the controller DC end (direct current end), the traditional design method is to add a number of large and small filter capacitors, magnetic rings, magnetic buckles, filter circuit boards and other filter components on the current transmission path. However, the traditional EMC design method has two disadvantages: on the one hand, since these filter components are independent individuals, a part of the space must be reserved to fix the components during installation. When there are enough filter components, the space for accommodating the filter module at the controller DC end will be enlarged, the design space of the DC / AC end will be compressed, and the design difficulty will be significantly increased; on the other hand, the filter components are independent individuals, the degree of integration of the filter module is low, the installation process is cumbersome, the production cycle of the controller product will be extended, and the production efficiency will be significantly reduced. Summary of the invention

[0005] In view of at least one of the above-mentioned technical problems, the present invention provides a DC-end multi-stage filtering structure, a motor controller and a vehicle. The filtering structure adopts a straight-line horizontal layout design strategy, and integrates and modularizes independent filter components, mounting bases, and current-carrying copper busbars, which can not only control the DC-end EMC design space, but also simplify the assembly process and improve assembly efficiency.

[0006] The technical solution of the present invention is:

[0007] One of the purposes of the present invention is to provide a DC-end multi-stage filter structure, which is fixed to the DC end in a controller housing, wherein the first end of the DC end is a high-voltage busbar and the end is a film capacitor, and the DC-end multi-stage filter structure comprises a primary filter fixing seat assembly and a secondary filter fixing seat assembly, wherein the primary filter fixing seat assembly and the secondary filter fixing seat assembly are arranged in a line in the controller housing along the length direction of the controller housing;

[0008] The input end of the high-voltage busbar is connected to the positive and negative input ends of the primary filter fixing seat assembly; the positive and negative output ends of the primary filter fixing seat assembly are connected to the positive and negative input ends of the secondary filter fixing seat assembly respectively;

[0009] The positive and negative output terminals of the secondary filter fixing seat assembly are respectively connected to the positive and negative input terminals of the film capacitor.

[0010] Optionally, the primary filter fixing seat assembly includes a first injection molded part housing and a first filter component; the first injection molded part housing has a first positive copper bar and a first negative copper bar; the first filter component has a power-taking end and a grounding end, the power-taking end is overlapped with the first positive copper bar and the first negative copper bar, and the grounding end is overlapped with the controller housing;

[0011] The secondary filter fixing seat assembly comprises a second injection molded part housing and a second filter device; the second injection molded part housing comprises a second positive copper bar, a second negative copper bar, a grounding copper bar and a plurality of grooves;

[0012] The second filter device includes a magnetic ring, a magnetic core, four second Y capacitors, a second X capacitor and a magnetic core pressing plate;

[0013] The magnetic core is located between the four second Y capacitors; the magnetic ring is fixed in a groove on the second injection molded part housing near the first-level filter fixing seat assembly, and the magnetic core pressure plate is fixed to the second-level filter fixing seat assembly and pressed on the magnetic core.

[0014] Optionally, the magnetic core is composed of an E-type magnetic core and an I-type magnetic core; and / or

[0015] Two vias are arranged on the upper part of the magnetic core, and the two vias pass through the second positive copper bar and the second negative copper bar respectively;

[0016] A magnetic ring through hole is arranged in the middle of the magnetic ring, and the magnetic ring through hole passes through the second positive copper bar and the second negative copper bar.

[0017] Optionally, the magnetic ring is wound by ultrafine crystal strip material, and is fixed to a side of the second injection molded part housing close to the primary filter fixing seat assembly by means of glue pouring or glue dispensing and sealing; and / or

[0018] The magnetic core is pressed into the groove on the side of the second injection molded part shell away from the primary filter fixing seat assembly by a magnetic core press, and a plurality of limiting ribs are arranged in the groove to position the magnetic core, and the magnetic core pressing plate is clamped and fixed to the filter fixing seat assembly.

[0019] Optionally, the input end of the high-voltage bus is connected to the positive and negative input ends of the primary filter fixing seat assembly by screw locking;

[0020] The positive and negative output ends of the primary filter fixing seat assembly are respectively connected to the positive and negative input ends of the secondary filter fixing seat assembly by screw locking;

[0021] The positive and negative output ends of the secondary filter fixing seat assembly are respectively connected to the positive and negative input ends of the film capacitor by screw locking.

[0022] Optionally, the first filtering device includes a circuit board and two first X capacitors and two first Y capacitors arranged on the circuit board;

[0023] The circuit board has two mounting holes as the power-taking ends on one end close to the high-voltage busbar, and has one mounting hole as the grounding end on one end close to the secondary filter fixing seat assembly;

[0024] The two first X capacitors are arranged at intervals along the arrangement direction of the primary filter fixing seat assembly and the secondary filter fixing seat assembly, and the two first Y capacitors are symmetrically arranged on both sides of one of the first X capacitors.

[0025] Optionally, the four second Y capacitors and the one second X capacitor are embedded in the remaining grooves in the second injection molded part housing, wherein two second Y capacitors are arranged side by side on a side of the second injection molded part housing away from the primary filter fixing seat assembly, and the remaining two second Y capacitors and the one second X capacitor are arranged side by side on a side of the second injection molded part housing close to the primary filter fixing seat assembly and close to the magnetic ring;

[0026] The second positive copper bar and the second negative copper bar are respectively led out with power-taking welding pins, and the grounding copper bar is led out with a grounding welding pin. The power-taking welding pins are welded and fixed to the power-taking pins on the second X capacitor and the second Y capacitor to take power from the second X capacitor and the second Y capacitor; the grounding welding pin is welded and fixed to the grounding pin on the second Y capacitor to ground the second Y capacitor.

[0027] Optionally, the controller housing includes a shell and an upper cover;

[0028] The bottom end of the shell is integrally formed with a plurality of first shielding structures that protrude and extend upward;

[0029] A plurality of second shielding structures protruding and extending downward are integrally formed on the inner top wall of the upper cover;

[0030] The first shielding structure and the second shielding structure are staggered to form a maze-like shielding cavity, and the primary filter fixing seat assembly and the secondary filter fixing seat assembly are arranged in the maze-like shielding cavity.

[0031] Another object of the present invention is to provide a motor controller, comprising the DC-end multi-stage filter structure described in any one of the above items.

[0032] Another object of the present invention is to provide a vehicle, comprising the above-mentioned motor controller.

[0033] Compared with the prior art, the advantages of the present invention are:

[0034] The DC-end multi-stage filtering structure of the present invention integrates a plurality of filtering components together through an integrated and modular design, which can ensure that the EMC capability of the DC-end of the controller is improved to the greatest extent within a limited space. By adding an EMC shielding structure, the crosstalk of high and low voltage signals is effectively isolated, the spatial radiation is reduced, and the EMC capability is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0036] Figure 1 It is a schematic diagram of the installation structure of the DC-end multi-stage filter structure in the controller housing according to an embodiment of the present invention;

[0037] Figure 2 It is a structural schematic diagram of a first-stage filter fixing seat assembly of a DC-end multi-stage filter structure according to an embodiment of the present invention;

[0038] Figure 3 It is a structural schematic diagram of a first filter device of a first-stage filter fixing seat assembly of a DC-end multi-stage filter structure according to an embodiment of the present invention;

[0039] Figure 4 It is a structural schematic diagram of a secondary filter fixing seat assembly of a DC-end multi-stage filter structure according to an embodiment of the present invention;

[0040] Figure 5 It is a structural schematic diagram of a magnetic ring of a secondary filter fixing seat assembly of a DC-end multi-stage filter structure according to an embodiment of the present invention;

[0041] Figure 6 It is a structural schematic diagram of the magnetic core of the first-stage filter fixing seat assembly of the DC-end multi-stage filter structure according to an embodiment of the present invention;

[0042] Figure 7It is a structural schematic diagram of the shielding cavity of the controller housing of the DC-end multi-stage filtering structure according to an embodiment of the present invention.

[0043] Wherein: 1. primary filter fixing seat assembly; 2. secondary filter fixing seat assembly; 3. first positive input terminal; 4. first negative input terminal; 5. first positive output terminal; 6. first negative output terminal; 7. second positive input terminal; 8. second negative input terminal; 9. second positive output terminal; 10. second negative output terminal; 11. first filter device; 12. power supply terminal; 13. ground terminal; 14. magnetic ring; 15. magnetic core; 16. power supply welding foot; 17. grounding welding foot; 18. second X capacitor; 19. second Y capacitor; 20. first X capacitor; 21. first Y capacitor; 22. shell structural ribs; 23. high voltage busbar; 24. film capacitor; 25. upper cover structural ribs; 26. E-type magnetic core; 27. I-type magnetic core; 28. magnetic core pressure plate. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0045] See also Figures 1 to 7 A DC-end multi-stage filter structure of an embodiment of the present invention is fixed to the DC end in the controller housing, that is, the DC end, and the first end of the DC end is also as shown in FIG. Figure 1 The left end is the high voltage bus 23, and the end is Figure 1 The lower right side is a film capacitor 24. The DC end multi-stage filter structure includes a primary filter fixing seat assembly 1 and a secondary filter fixing seat assembly 2. The primary filter fixing seat assembly 1 and the secondary filter fixing seat assembly 2 are arranged in a horizontal line in the controller housing. Figure 1 As shown, the left side of the controller housing is the primary filter fixing seat assembly 1, and the right side of the controller housing is the secondary filter fixing seat assembly 2, which can well control the design space of the DC end EMC.

[0046] The input end of the high-voltage busbar 23 is connected to the positive and negative input ends of the primary filter fixture assembly 1. The positive and negative output ends of the primary filter fixture assembly 1 are connected to the positive and negative input ends of the secondary filter fixture assembly 2. The positive and negative output ends of the secondary filter fixture assembly 2 are connected to the positive and negative input ends of the film capacitor 24. Specifically, Figure 1As shown, the input end of the high-voltage busbar 23 is connected to the positive and negative input ends of the primary filter fixing seat assembly 1 by screw locking. The positive and negative output ends of the primary filter fixing seat assembly 1 are respectively connected to the positive and negative input ends of the secondary filter fixing seat assembly 2 by screw locking. The positive and negative output ends of the secondary filter fixing seat assembly 2 are respectively connected to the positive and negative input ends of the film capacitor 24 by screw locking.

[0047] like Figure 2 and Figure 3 As shown, the primary filter fixing seat assembly 1 includes a first injection molded part housing and a first filter element 11. The first injection molded part housing is roughly rectangular, and the first injection molded part housing contains a first positive copper bar and a first negative copper bar. The two ends of the first positive copper bar are respectively the positive input terminal and the positive output terminal of the primary filter fixing seat assembly 1, and the two ends of the first negative copper bar are respectively the negative input terminal and the negative output terminal of the primary filter fixing seat assembly 1. For the convenience of description and distinction, the positive input terminal and the positive output terminal of the primary filter fixing seat assembly 1 are described herein as the first positive input terminal 3 and the first positive output terminal 5, respectively, and the negative input terminal and the negative output terminal of the primary filter fixing seat assembly 1 are described herein as the first negative input terminal 4 and the first negative output terminal 6, respectively. As Figure 2 As shown, the first positive input terminal 3 and the first negative input terminal 4 are arranged side by side at the left end of the first injection molded part shell, and the first positive output terminal 5 and the first negative output terminal 6 are arranged side by side at the right end of the first injection molded part shell.

[0048] like Figure 2 As shown, the first filter device 11 is arranged between the first positive input terminal 3, the first negative input terminal 4 and the first positive output terminal 5, the first negative output terminal 6, and includes a circuit board and two first X capacitors 20 and two first Y capacitors 21 arranged on the circuit board. In this embodiment, the circuit board is a filter PCBA, that is, a printed circuit board or a printed circuit board.

[0049] like Figure 3As shown, two first X capacitors 20 are arranged at intervals in front and back along the arrangement direction of the primary filter fixing seat assembly 1 and the secondary filter fixing seat assembly 2, and two first Y capacitors 21 are symmetrically arranged on the upper and lower sides of one of the first X capacitors 20, specifically the first X capacitor 20 close to the first positive output terminal 5 or the first negative output terminal 6. More specifically, the circuit board is a square circuit board, a first X capacitor 20 with a larger size is arranged on the upper right side of the circuit board, another first X capacitor 20 with a smaller size is arranged on the lower left side of the circuit board and has an interval with the other first X capacitor 20, and the two first Y capacitors 21 are symmetrically arranged on both sides of the first X capacitor 20 with a larger size. Three mounting holes are provided on the circuit board, wherein the two holes located on both sides of the first X capacitor 20 with a smaller size are power-taking terminals 12, and a mounting hole located on the upper right side of the first X capacitor 20 with a larger size is a grounding terminal 13, and the power-taking terminal 12 is correspondingly overlapped with the first positive copper bar and the first negative copper bar, so as to take power from the two poles of the first X capacitor 20 and one pole of the first Y capacitor 21. The ground terminal 13 is connected to the controller housing to ground the other pole of the Y capacitor. The first X capacitor 20 can effectively suppress differential mode interference, and the first Y capacitor 21 can effectively suppress common mode interference.

[0050] like Figures 4 to 6 As shown, the secondary filter fixing seat assembly 2 includes a second injection molded housing and a second filter element. Figure 1 The second injection molded part extends in the left and right directions as shown, and has a second positive copper bar, a second negative copper bar, a grounding copper bar and a plurality of grooves (not shown in the figure). The two ends of the second positive copper bar are respectively the positive input terminal and the positive output terminal of the secondary filter fixing seat assembly 2, and the two ends of the second negative copper bar are respectively the negative input terminal and the negative output terminal of the secondary filter fixing seat assembly 2. For the convenience of description and distinction, the positive input terminal and the positive output terminal of the secondary filter fixing seat assembly 2 are described herein as the second positive input terminal 7 and the second positive output terminal 9, respectively, and the negative input terminal and the negative output terminal of the secondary filter fixing seat assembly 2 are described herein as the second negative input terminal 8 and the second negative output terminal 10, respectively. As Figure 4 As shown, the second positive input terminal 7 and the second negative input terminal 8 are arranged side by side on the left side of the second injection molded part housing, and the second positive output terminal 9 and the second negative output terminal 10 are arranged side by side on the right front end of the second injection molded part housing.

[0051] The second filter device includes a magnetic ring 14, a magnetic core 15, four second Y capacitors 19, a second X capacitor 18 and a magnetic core pressing plate 28. Figure 5 As shown, the magnetic ring 14 is an elliptical magnetic ring 14, and a magnetic ring through hole is provided in the middle thereof, and the magnetic ring through hole passes through the second positive copper bar and the second negative copper bar. Figure 4As shown, the magnetic ring 14 is fixed on the side of the second injection molded part housing close to the primary filter fixing seat assembly 11, that is, Figure 4 In a groove (not shown in the figure) on the left side shown, the groove is an elliptical groove matching the magnetic ring 14.

[0052] The magnetic core 15 is pressed into the second injection molded part shell through the magnetic core pressing plate 28 and has two vias (not shown in the figure), which pass through the second positive copper bar and the second negative copper bar respectively. It can effectively suppress differential mode or common mode interference. In addition, the method of fixing the magnetic core 15 by the magnetic core pressing plate 28 can reduce the loss of magnetic core performance. For the structure of the magnetic core 15, such as Figure 6 As shown, it is composed of an E-type magnetic core 26 and an I-type magnetic core 27, and the open end of the E-type magnetic core 26 is fixed on the I-type magnetic core 27 downward. Figure 4 As shown, the core pressing plate 28 is made of metal material such as copper, aluminum, etc. The core pressing plate 28 is a U-shaped structure, and the side walls on both sides of the opening are provided with buckles or slots. Correspondingly, a slot corresponding to the buckle or a buckle structure corresponding to the slot is provided on the secondary filter fixing seat assembly 2. The inner side of the bottom wall of the core pressing plate 28 is pressed against the upper surface of the magnetic core 15 and fixed by adhesive potting. As an optional embodiment, the core pressing plate 28 and the secondary filter fixing seat assembly 2 can also be fixed in other forms such as screw fixing, etc., which are not specifically limited in detail. Those skilled in the art can select and design according to actual needs. In this embodiment, it is preferred to adopt a clamping fixation. Preferably, in the groove of the secondary filter fixing seat assembly 2 where the magnetic core 15 is installed, a limiting convex rib for positioning the magnetic core 15 is also provided, which can facilitate the lateral positioning and longitudinal downward positioning of the magnetic core 15, and the magnetic core is positioned longitudinally upward in combination with the core pressing plate 28, thereby realizing the lateral and longitudinal limiting of the magnetic core 15. The specific structure of the limiting rib is not described or limited in detail, and can be designed to match the bottom structure of the magnetic core 15 .

[0053] Four second Y capacitors 19 and one second X capacitor 18 are embedded in the remaining grooves in the second injection molded part housing. Figure 4 As shown, the two second Y capacitors 19 are arranged side by side on the side of the second injection molded part housing away from the primary filter fixing seat assembly 1, that is, as shown in FIG. Figure 4 On the right side of the second injection molded part housing shown in FIG. 1 , the remaining two second Y capacitors 19 and one second X capacitor 18 are arranged side by side in the front, middle and back of the second injection molded part housing on one side close to the primary filter fixing seat assembly 1 and close to the magnetic ring 14, that is, Figure 4 The left side of the second injection-molded part housing shown is specifically the right side of the magnetic ring 14 .

[0054] like Figure 4As shown, the magnetic core 15 is located between the four second Y capacitors 19 and is specifically arranged in the middle of the second injection molded part housing.

[0055] The second positive copper bar and the second negative copper bar are respectively led out with a power supply welding pin 16, and the grounding copper bar is led out with a grounding welding pin 17. The power supply welding pin 16 is welded and fixed to the power supply pins on the second X capacitor 18 and the second Y capacitor 19 to supply power to the second X capacitor 18 and the second Y capacitor 19. The grounding welding pin 17 is welded and fixed to the grounding pin on the second Y capacitor 19 to ground the second Y capacitor 19. The second X capacitor 18 can effectively suppress differential mode interference, and the second Y capacitor 19 can effectively suppress common mode interference.

[0056] In some preferred embodiments, the magnetic ring 14 is fixed to one side of the second injection molded part housing close to the primary filter fixing seat assembly 1 by means of glue filling or glue dispensing and sealing. Figure 4 The left side of the second injection molded part housing is shown. In some alternative embodiments, the magnetic ring 14 can also be fixed by a stainless steel spring sheet plus a silicone cushion.

[0057] In some preferred embodiments, the magnetic core 15 is fixed in the groove on the side of the second injection molded part housing away from the primary filter fixing seat assembly 1 by potting. Figure 4 The middle part of the second injection molded housing is shown.

[0058] It should be noted that the applicant has previously applied for a patent for a similar multi-stage filtering structure, but the applicant found that it still needs to be improved. This application is based on the improvement of the previous application. In addition to the improvements in the above-mentioned arrangement and structure, some structures have been improved, specifically, Figure 7 As shown, the controller housing includes a shell and an upper cover. The shell is bent upward and extended to form a first cavity. The bottom end of the shell is integrally formed with a plurality of first shielding structures protruding upward. In this embodiment, they are shell structural ribs 22. The shell structural ribs 22 are arranged on the front and rear sides of the shell. The upper cover is bent downward and extended to form a second cavity. The top wall of the upper cover is integrally formed with a plurality of second shielding structures protruding downward. In this embodiment, they are upper cover structural ribs 25. The upper cover structural ribs 25 extend along the length direction of the upper cover. Figure 7 As shown, the left and right directions are arranged at intervals, and the first shielding structure, i.e., the upper cover structure ribs 25 and the second shielding structure, i.e., the shell structure ribs 22, are staggered to form a shielding structure similar to a maze shielding cavity (the specific structure is not described and limited in detail, and is a maze-like structure known and easily implemented by conventional technicians in the field), and the magnetic ring assembly, i.e., the primary filter fixing seat assembly 1 and the secondary filter fixing seat assembly 2, are installed in the maze-like shielding cavity. When assembling the magnetic ring assembly, the shell and the upper cover of the DC end multi-stage filter structure, the assembly of the EMC shielding protection is completed, reducing the assembly process and improving production efficiency.

[0059] The multi-stage filter structure at the DC end of the embodiment of the present invention brings together many filter components through an integrated and modular design, which can ensure that the EMC capability of the DC end of the controller is maximized within a limited space. By adding an EMC shielding structure, the crosstalk of high and low voltage signals is effectively isolated, the spatial radiation is reduced, and the EMC capability is improved. The shielding structure is a labyrinth-like shielding structure formed by the shell structure ribs 22 and the upper cover structure ribs 25, which replaces the existing metal shielding cover, does not require additional shielding structure design, and has a simple structure.

[0060] The DC-end multi-stage filter structure of the embodiment of the present invention adopts a magnetic ring 14 instead of a magnetic core at the connection between the primary filter fixing seat assembly 1 and the secondary filter fixing seat assembly 2, so that the primary filter fixing seat assembly 1 and the secondary filter fixing seat assembly 2 are combined into one, which can ensure that the EMC capability of the DC end of the controller is maximized within a limited space.

[0061] The DC-end multi-stage filter structure of the embodiment of the present invention can meet different levels of EMC requirements such as level 3, level 4, level 5, etc. by adding or deleting filter capacitors, magnetic rings 14, magnetic cores 15, and filter circuit boards according to customer or cost requirements.

[0062] The embodiment of the present invention further provides a motor controller, including the DC-end multi-stage filter structure of the above embodiment. Other structures and working principles in the motor controller are not described and limited in detail here, and are conventional structures.

[0063] An embodiment of the present invention further provides a vehicle, comprising the motor controller of the above embodiment.

[0064] It should be understood that the above specific embodiments of the present invention are only used to illustrate or explain the principles of the present invention, and do not constitute a limitation of the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. In addition, the appended claims of the present invention are intended to cover all changes and modifications that fall within the scope and boundaries of the appended claims, or the equivalent forms of such scope and boundaries.

Claims

1. A DC-end multi-stage filter structure, fixed at the DC end in the controller housing, characterized in that: The head end of the DC end is a high-voltage busbar (23), and the tail end is a thin-film capacitor (24); the DC end multi-stage filter structure comprises a primary filter fixing seat assembly (1) and a secondary filter fixing seat assembly (2); the primary filter fixing seat assembly (1) and the secondary filter fixing seat assembly (2) are arranged in a line in the controller housing along the length direction of the controller housing; The input end of the high-voltage busbar (23) is correspondingly connected to the positive and negative input ends of the primary filter fixing seat assembly (1); The positive and negative output terminals of the primary filter fixing seat assembly (1) are respectively connected to the positive and negative input terminals of the secondary filter fixing seat assembly (2); The positive and negative output terminals of the secondary filter fixing seat assembly (2) are respectively connected to the positive and negative input terminals of the thin film capacitor (24); The primary filter fixing seat assembly (1) comprises a first injection molded part housing and a first filter component (11); the first injection molded part housing comprises a first positive copper bar and a first negative copper bar; the first filter component (11) comprises a power supply terminal (12) and a ground terminal (13); the power supply terminal (12) is overlapped with the first positive copper bar and the first negative copper bar, and the ground terminal (13) is overlapped with the controller housing; The secondary filter fixing seat assembly (2) comprises a second injection molded part housing and a second filter component; the second injection molded part housing comprises a second positive copper bar, a second negative copper bar, a grounding copper bar and a plurality of grooves; The second filter device comprises a magnetic ring (14), a magnetic core (15), four second Y capacitors (19), a second X capacitor (18) and a magnetic core pressing plate (28); The magnetic core (15) is located between the four second Y capacitors (19); the magnetic ring (14) is fixed in a groove on the second injection molded part housing close to the first-stage filter fixing seat assembly (1); the magnetic core pressing plate (28) is a U-shaped structure, and the side walls on both sides of the opening are provided with buckles or slots; a slot corresponding to the buckle or a buckle structure corresponding to the slot is provided on the second-stage filter fixing seat assembly (2); the inner side of the bottom wall of the magnetic core pressing plate (28) is pressed against the upper surface of the magnetic core (15) and fixed by glue potting; The four second Y capacitors (19) and the one second X capacitor (18) are embedded in the remaining grooves in the second injection molded part housing, wherein two second Y capacitors (19) are arranged side by side on a side of the second injection molded part housing away from the primary filter fixing seat assembly (1), and the remaining two second Y capacitors (19) and the one second X capacitor (18) are arranged side by side on a side of the second injection molded part housing close to the primary filter fixing seat assembly (1) and close to the magnetic ring (14).

2. A DC-end multi-stage filtering structure according to claim 1, characterized in that: The magnetic core (15) is composed of an E-type magnetic core (26) and an I-type magnetic core (27); and / or The upper part of the magnetic core (15) is provided with two via holes, and the two via holes pass through the second positive copper bar and the second negative copper bar respectively; A magnetic ring through hole is provided in the middle of the magnetic ring (14), and the magnetic ring through hole passes through the second positive copper bar and the second negative copper bar.

3. A DC-end multi-stage filtering structure according to claim 1, characterized in that: The magnetic ring (14) is formed by winding an ultrafine crystal strip and is fixed to a side of the second injection molded part housing close to the primary filter fixing seat assembly (1) by means of glue pouring or glue dispensing and sealing; and / or The magnetic core (15) is pressed into the groove on the side of the second injection molded part housing away from the primary filter fixing seat assembly (1) by the magnetic core pressing plate (28), and a plurality of limiting convex ribs are arranged in the groove to position the magnetic core (15), and the magnetic core pressing plate (28) is clamped and fixed to the filter fixing seat assembly (2).

4. A DC-end multi-stage filtering structure according to claim 1, characterized in that: The input end of the high-voltage busbar (23) is connected to the positive and negative input ends of the primary filter fixing seat assembly (1) by means of screw locking; The positive and negative output ends of the primary filter fixing seat assembly (1) are respectively connected to the positive and negative input ends of the secondary filter fixing seat assembly (2) by means of screw locking; The positive and negative output ends of the secondary filter fixing seat assembly (2) are respectively connected to the positive and negative input ends of the film capacitor (24) by means of screw locking.

5. A DC-end multi-stage filtering structure according to claim 1, characterized in that: The first filtering device (11) comprises a circuit board and two first X capacitors (20) and two first Y capacitors (21) arranged on the circuit board; The circuit board has two mounting holes as the power supply terminals (12) on one end close to the high-voltage busbar (23), and has one mounting hole as the ground terminal (13) on one end close to the secondary filter fixing seat assembly (2); The two first X capacitors (20) are arranged at intervals along the arrangement direction of the primary filter fixing seat assembly (1) and the secondary filter fixing seat assembly (2), and the two first Y capacitors (21) are symmetrically arranged on both sides of one of the first X capacitors (20).

6. A DC-end multi-stage filtering structure according to claim 1, characterized in that: A power supply welding pin (16) is led out from the second positive copper bar and the second negative copper bar respectively, and a grounding welding pin (17) is led out from the grounding copper bar. The power supply welding pin (16) is welded and fixed to the power supply pins on the second X capacitor (18) and the second Y capacitor (19) to supply power to the second X capacitor (18) and the second Y capacitor (19); and the grounding welding pin (17) is welded and fixed to the grounding pin on the second Y capacitor (19) to ground the second Y capacitor (19).

7. A DC-end multi-stage filter structure according to claim 1, characterized in that: The controller housing comprises a shell and an upper cover; The bottom end of the shell is integrally formed with a plurality of first shielding structures that protrude and extend upward; A plurality of second shielding structures protruding and extending downward are integrally formed on the inner top wall of the upper cover; The first shielding structure and the second shielding structure are arranged in an interlaced manner to form a labyrinth-like shielding cavity, and the primary filter fixing seat assembly (1) and the secondary filter fixing seat assembly (2) are arranged in the labyrinth-like shielding cavity.

8. A motor controller, characterized in that: It comprises the DC-end multi-stage filtering structure as described in any one of claims 1-7.

9. A vehicle, characterized in that: Includes the motor controller as described in claim 8.

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