Filter assembly, inverter, motor drive system and vehicle

Abstract

An embodiment of the present application provides a filter assembly, an inverter, a motor drive system, and a vehicle, the filter assembly including N AC metal rows, a boost metal row, and a magnetic ring, wherein at least a portion of the N AC metal rows are stacked, where N is an integer greater than 1, the boost metal row is located on one side of the N AC metal rows, and the magnetic ring is located surrounding the N AC metal rows and the boost metal row, and the N AC metal rows and the boost metal row are located within the magnetic ring facing each other with a gap therebetween.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application claims priority to International Patent Application PCT / CN2022 / 110584, entitled "Filter Assembly, Inverter, Motor Drive System and Vehicle," filed on August 5, 2022, the entire contents of which are incorporated herein by reference. [Technical Field]

[0002] The present application relates to the field of filtering technology, and in particular to filter assemblies, inverters, motor drive systems and vehicles. [Background technology]

[0003] With the rapid development of motor drive systems, their voltage levels are gradually increasing. To meet the charging demands of high-voltage battery packs, a relay is generally added, and the motor winding is used as a boost inductance and a switch module of the inverter to integrate a DC boost function into the motor drive system, so that the motor drive system has two modes: driving and boost charging.

[0004] However, the filter assembly structure in the related art often has difficulty in simultaneously meeting the filtering needs of the driving mode and the boost charging mode of the motor driving system, and is prone to problems such as saturation heat generation of the magnetic ring in the filter assembly, causing filtering failure. As can be seen from the above, the filter assemblies in the related art have the disadvantage of having relatively poor filtering effect. Summary of the Invention

[0005] The embodiments of the present application provide a filter assembly, an inverter, a motor drive system and a vehicle, and solve the technical problem that the filter assembly has the drawback of having a relatively poor filtering effect.

[0006] According to a first aspect, an embodiment of the present application provides a filter assembly, the filter assembly comprising: N alternating current metal strings, at least some of which are stacked, where N is an integer greater than 1; a boost metal string installed on one side of the N AC metal strings; The device includes a magnetic ring disposed to surround the N AC metal rows and the boost metal row, and the N AC metal rows and the boost metal row are positioned within the magnetic ring, facing each other at a distance.

[0007] In an embodiment of the present application, the N AC metal rows are stacked, and the boost metal row is installed on one side of the N AC metal rows. The N AC metal rows and the boost metal row are simultaneously surrounded by a magnetic ring and are located at opposite but spaced positions within the magnetic ring, thereby increasing the structural integration rate of the entire filter assembly. In this way, in the driving mode, the boost metal row is inactive, and the N AC metal rows pass AC current. At this time, due to the highly integrated structure of the filter assembly, the magnetic fields generated by the AC currents passing through the N AC metal rows cancel each other out, thereby solving the problem of localized saturation heating caused by uneven distribution in the magnetic ring, which causes filtering failure. In the boost charging mode, the boost metal row and the N AC metal rows both pass boost current. At this time, the magnetic fields generated by the currents of the boost metal row and the N AC metal rows cancel each other out within the magnetic ring, which prevents the magnetic ring from generating saturation heating and causing filtering failure. Therefore, this filter assembly can meet the filtering demands in two modes and has a higher filtering effect.

[0008] Optionally, in some embodiments, orthogonal projections in the stacking direction of any two of the N alternating current metal rows overlap.

[0009] In this way, the integration density of the N AC metal rows can be further improved, thereby further improving the problem of local saturation heating caused by uneven distribution of the magnetic rings in the driving mode, which in turn leads to filtering failure.

[0010] Optionally, in some embodiments, the filter assembly comprises: The magnetic core further includes a center post disposed within the magnetic ring and positioned between the N AC metal rows and the boost metal row, and an air gap is provided within the magnetic ring, and the air gap communicates with the N AC metal rows and the boost metal row.

[0011] In this embodiment, the presence of the air gap can provide differential mode inductance in the boost charging mode, which can suppress differential mode noise generated in the boost charging mode, thereby further improving the filtering effect of the filter assembly.

[0012] Optionally, in some embodiments, the magnetic core center post is connected to the inner wall of the magnetic ring.

[0013] In this embodiment, the magnetic core center post may be connected to the inner wall of the magnetic ring between the N AC metal rows and the boost metal row, and may be spaced apart from the inner wall opposite the connection to form an air gap, thereby achieving the purpose of providing differential mode inductance.

[0014] Optionally, in some embodiments, the magnetic core center post comprises: a first portion connected to an inner wall of the magnetic ring; and a second portion connected to the inner wall of the magnetic ring, the first portion and the second portion being spaced apart along a direction perpendicular to the direction in which the N AC metal rows face the boost metal rows.

[0015] In this embodiment, the magnetic core center post may include a first part and a second part, both connected to the inner wall of the magnetic ring and spaced apart, and an air gap may be formed between the first part and the second part, thereby achieving the purpose of providing differential mode inductance.

[0016] Optionally, in some embodiments, the first portion is positioned directly opposite the second portion, so that the size of the air gap can be more accurately adjusted, so that the differential mode inductance can better meet actual needs, and further improve the filtering effect of the filter assembly.

[0017] Optionally, in some embodiments, the magnetic core center post is spaced apart from the inner wall of the magnetic ring.

[0018] In this embodiment, the magnetic core center pillar and the magnetic ring are independent of each other, and at least two air gaps can be formed between the magnetic core center pillar and the inner wall of the magnetic ring. For the same maximum power during boost charging mode, the number of air gaps increases and the size of a single air gap decreases. Accordingly, the edge effect of the magnetic field generated by the magnetic potential of the air gap weakens as the size of the air gap decreases. Furthermore, the eddy current loss of the N AC metal rows and the boost metal rows decreases as the edge effect weakens.

[0019] Optionally, in some embodiments, the number of magnetic core columns is M, and the M magnetic core columns are spaced apart along a direction perpendicular to the direction in which the N AC metal columns face the boost metal columns, where M is an integer greater than 1.

[0020] In this embodiment, the M magnetic core center columns can further increase the number of air gaps, thereby further reducing the size of a single air gap, weakening the edge effect of the magnetic field, and further reducing the eddy current loss of the N AC metal rows and boost metal rows.

[0021] Optionally, in some embodiments, the boost metal row and the N AC metal rows are both arranged along a first direction; Alternatively, the boost metal row and the N AC metal rows are both arranged along the second direction; Or, one of the boost metal row and the N AC metal rows is arranged along a first direction, and the other is arranged along a second direction; Here, the first direction is perpendicular to the direction in which the N AC metal rows face the boost metal rows, and the second direction is parallel to the direction in which the N AC metal rows face the boost metal rows.

[0022] In this embodiment, the directions and positions of the boost metal row and the N AC metal rows can both be adjusted based on the actual deployment and space of the motor drive system, so that the structure of the filter assembly is not limited by the position of the metal row, and the filter assembly has a higher degree of freedom.

[0023] Optionally, in some embodiments, the cross-sectional shape of the magnetic ring is rectangular, circular, or elliptical.

[0024] In this embodiment, the shape of the magnetic ring can also be selected according to actual needs, further improving the flexibility of the filter assembly.

[0025] According to a second aspect, an embodiment of the present application further provides an inverter, comprising the filter assembly of the first aspect.

[0026] In the embodiment of the present application, the inverter adopts the above filter assembly structure, which can solve the problem of filtering failure caused by saturation heat of the magnetic ring in both the driving mode and the boost charging mode. That is, the inverter can meet the filtering needs in both modes and has a higher filtering effect.

[0027] According to a third aspect, an embodiment of the present application further provides a motor drive system, comprising the inverter of the second aspect.

[0028] In the embodiment of the present application, when the motor drive system is in the driving mode or the boost charging mode, the magnetic ring will not cause filtering failure due to saturation heat, and the filtering effect of the motor drive system is higher and more reliable.

[0029] According to a fourth aspect, an embodiment of the present application further provides a vehicle, comprising the motor drive system of the third aspect.

[0030] In the embodiment of the present application, the filtering effect of the motor drive system is stronger and the reliability is higher, which can improve the driving comfort of the vehicle and the safety of the charging of the vehicle.

[0031] The above description is merely a summary of the technical solution of the present application, which may be implemented according to the contents of the specification in order to more clearly understand the technical means of the present application. In order to make the above and other objectives, features and advantages of the present application more clearly understandable, the following particularly cites specific embodiments of the present application for description. [Brief explanation of the drawings]

[0032] In order to more clearly explain the technical solutions of the embodiments of the present application, the following briefly introduces the drawings that need to be used in the embodiments of the present application. It is obvious that the drawings in the following description are only some embodiments of the present application, and those skilled in the art can obtain other drawings based on the drawings without exerting any creative efforts. [Figure 1] 1 is a structural schematic diagram of a filter assembly according to an embodiment of the present application; [Figure 2] 1 is a structural schematic diagram of one of N AC metal columns in a filter assembly according to an embodiment of the present application. [Figure 3] FIG. 10 is another structural schematic diagram of N AC metal columns in a filter assembly according to an embodiment of the present application. [Figure 4] FIG. 2 is another structural schematic diagram of a filter assembly according to an embodiment of the present application. [Figure 5]5 is a schematic diagram showing another structure of the center pillar of the magnetic core in FIG. 4. [Figure 6] FIG. 2 is another structural schematic diagram of a filter assembly according to an embodiment of the present application. [Figure 7a] 1 is a schematic diagram of an arrangement of N AC metal rows and boost metal rows in a filter assembly according to an embodiment of the present application. [Figure 7b] 2 is a second schematic diagram of an arrangement of N AC metal rows and boost metal rows in a filter assembly according to an embodiment of the present application. [Figure 7c] 3 is a third schematic diagram of an arrangement of N AC metal rows and boost metal rows in a filter assembly according to an embodiment of the present application. [Figure 7d] FIG. 4 is a fourth schematic diagram of an arrangement of N AC metal rows and boost metal rows in a filter assembly according to an embodiment of the present application. [Figure 8] 1 is a structural schematic diagram of a magnetic ring in a filter assembly according to an embodiment of the present application. DETAILED DESCRIPTION OF THE INVENTION

[0033] The following describes in more detail the embodiments of the present application in conjunction with the drawings and examples. The detailed description of the embodiments and the drawings are for illustrative purposes only to explain the principles of the present application, but are not intended to limit the scope of the present application, i.e., the present application is not limited to the described embodiments.

[0034] In the description of this application, it should be explained that, unless otherwise specified, "plurality" means two or more, and the orientations or positional relationships indicated by terms such as "up," "down," "left," "right," "inside," and "outside" are merely for the convenience and brevity of the description of this application and do not indicate or imply that the referenced devices or elements must have a particular orientation or be configured and operated in a particular orientation, and should not be understood as limitations on this application. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and should not be understood as indicating or implying relative importance. "Perpendicular" does not mean perpendicular in the strict sense, but has a margin of error. "Parallel" does not mean parallel in the strict sense, but has a margin of error.

[0035] The directional terms used in the following description are all directions shown in the drawings and do not limit the specific structure of the present application. It should be further explained that in the description of the present application, unless otherwise clearly defined or limited, the terms "attached," "connected," and "connected" should be understood in a broad sense, and may refer to, for example, a fixed connection, a detachable connection, or an integral connection, or may be a direct connection or an indirect connection via an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the present application according to the specific circumstances.

[0036] In related art, filter assemblies generally use a magnetic ring to surround multiple AC metal strings (e.g., three-phase metal strings) arranged in parallel along a certain direction, i.e., the multiple AC metal strings are located inside the magnetic ring and the boost metal string is located outside the magnetic ring. In this way, in the drive mode, the AC metal strings pass AC current, and the multiple AC metal strings are uniformly distributed within the magnetic ring, so the magnetic fields they generate can cancel each other out, thereby preventing the magnetic ring from saturating in the drive mode and maintaining the filtering suppression effect of the magnetic ring. However, in the boost charging mode, the multiple AC metal strings all pass the same phase boost current, which causes the magnetic ring to saturate and heat up, resulting in a loss of filtering effectiveness.

[0037] The applicant discovered that the magnetic ring can simultaneously surround both the AC metal row and the boost metal row, i.e., both the AC metal row and the boost metal row are located within the magnetic ring. This allows the magnetic ring to cancel out the magnetic fields generated by the currents flowing through the boost metal row and the AC metal row in the boost charging mode, preventing the magnetic ring from overheating and causing filtering failure. However, in the driving mode, multiple AC metal rows are arranged in parallel along a certain direction. When the boost metal row is not operating and AC current flows only through the multiple AC metal rows, the magnetic ring can overheat locally due to the uneven magnetic field distribution, which can also cause the filtering suppression function to fail over time. As can be seen from the above, conventional filter assemblies often have difficulty simultaneously meeting the filtering needs in both modes.

[0038] Based on the above problems discovered by the applicant, the applicant has improved the structure of the filter assembly, and the technical solutions described in the embodiments of the present application are applied to the filter assembly, an inverter including the filter assembly, a motor drive system including the inverter, and a vehicle using the motor drive system.

[0039] Referring to FIG. 1, FIG. 1 illustrates a filter assembly according to some embodiments of the present application; N AC metal rows 10, at least some of which are stacked, where N is an integer greater than 1; A boost metal array 20 is installed on one side of the N AC metal arrays 10; The magnetic ring 30 is disposed to surround the N AC metal rows 10 and the boost metal rows 20, and the N AC metal rows 10 and the boost metal rows 20 are positioned within the magnetic ring 30 facing each other at intervals.

[0040] In the embodiment of the present application, the N AC metal strings 10 may refer to metal strings for transmitting AC currents of different phases in the motor drive system in driving mode. The number of metal strings may be set according to actual circumstances and is not specifically limited herein. For example, assuming that the N AC metal strings 10 can output three-phase AC current, the N AC metal strings 10 may include a first metal string, a second metal string, and a third metal string, where the first metal string may transmit U-phase AC current, the second metal string may transmit V-phase AC current, and the third metal string may transmit W-phase AC current, and the U-phase AC current, V-phase AC current, and W-phase AC current have the same frequency, equal potential amplitude, and a phase difference of 120° from each other. It can be understood that the AC metal strings and boost metal strings may be made of metals such as copper, alloy, aluminum, iron, etc.

[0041] At least some of the N AC metal rows 10 may be stacked. As can be understood, when the N AC metal rows 10 are stacked, two adjacent AC metal rows 10 may be stacked together, as shown in Figure 2, or two adjacent AC metal rows 10 may be completely overlapped and stacked together, as shown in Figure 3. In this way, the integration density of the N AC metal rows 10 is increased.

[0042] The boost metal row 20 may be located on one side of the N AC metal rows 10 that are stacked, and the magnetic ring 30 simultaneously surrounds the N AC metal rows 10 and the boost metal rows 20, so that the N AC metal rows 10 and the boost metal rows 20 are all located within the magnetic ring 30, and the N AC metal rows 10 and the boost metal rows 20 can be distributed opposite each other at intervals within the magnetic ring 30.

[0043] When the motor drive system is in driving mode, the boost metal array 20 is inactive (i.e., does not pass current), and the N AC metal arrays 10 pass AC current. At this time, the N AC metal arrays 10 adopt a stacked installation structure, so the N AC metal arrays 10 are highly integrated within the magnetic ring 30. The magnetic fields generated by the AC currents passing through the N AC metal arrays 10 can cancel each other out, thereby solving the problem of localized saturation heat generation caused by uneven distribution within the magnetic ring 30, which causes filtering failure. When the motor drive system is in boost charging mode, the boost metal array 20 and the N AC metal arrays 10 both pass boost current, and the magnetic fields generated by the currents of the boost metal array 20 and the N AC metal arrays 10 cancel each other out within the magnetic ring 30, which prevents the magnetic ring 30 from generating saturation heat and causing filtering failure. Therefore, in both the driving mode and the boost charging mode, the filter assembly structure of the embodiment of the present application can be adopted to solve the problem of ineffective filtering caused by saturated heat generation of the magnetic ring 30. In other words, the filter assembly can meet the filtering needs in both modes and achieve a higher filtering effect.

[0044] Optionally, in some embodiments, the orthogonal projections in the stacking direction of any two of the N AC metal rows 10 overlap.

[0045] As shown in FIG. 3, in this embodiment, the orthogonal projection of any two AC metal rows 10 along the stacking direction may overlap, in other words, the N AC metal rows 10 may be completely overlapped and stacked together. In this way, the integration density of the N AC metal rows 10 can be further improved, thereby further improving the problem of local saturation heat caused by the uneven distribution of the magnetic rings 30 in the driving mode, which further reduces the problem of filtering failure.

[0046] Optionally, in some embodiments, the filter assembly comprises: The magnetic core further includes a central post 40 that is installed within the magnetic ring 30 and positioned between the N AC metal rows 10 and the boost metal row 20, and an air gap 31 is provided within the magnetic ring 30, and the air gap 31 communicates with the N AC metal rows 10 and the boost metal row 20.

[0047] 4, in this embodiment, a magnetic core center post 40 may be further installed within the magnetic ring 30, and the magnetic core center post 40 may be located between the N AC metal rows 10 and the boost metal rows 20, separating the N AC metal rows 10 from the boost metal rows 20. In other words, the magnetic core center post 40 can divide the space within the magnetic ring 30 into two regions, so that the N AC metal rows 10 and the boost metal rows 20 can be located in different regions.

[0048] An air gap 31 may be further provided within the magnetic ring 30, connecting the N AC metal rows 10 and the boost metal rows 20. That is, the magnetic core center post 40 does not completely separate the N AC metal rows 10 and the boost metal rows 20 within the magnetic ring 30, leaving an air gap 31, where the size of the air gap 31 may be adjusted based on the maximum power in the boost charging mode. Generally, the larger the maximum power, the larger the size of the air gap 31.

[0049] In this embodiment, the presence of the air gap 31 can provide a differential mode inductance in the boost charging mode, which can suppress the differential mode noise generated in the boost charging mode, thereby further improving the filtering effect of the filter assembly.

[0050] Optionally, in some embodiments, the magnetic core post 40 is connected to the inner wall of the magnetic ring 30 .

[0051] 4, the magnetic core center post 40 may be connected to the inner wall of the magnetic ring 30 between the N AC metal rows 10 and the booster metal row 20. For example, assuming that the magnetic ring 30 is a rectangular magnetic ring 30, the N AC metal rows 10 and the booster metal row 20 may be located on both the left and right sides of the rectangular magnetic ring 30, respectively, and the magnetic core center post 40 may be connected to the upper or lower inner wall of the rectangular magnetic ring 30 and installed with a gap between it and the inner wall on the opposite side, thereby forming an air gap 31 between the magnetic core center post 40 and the inner wall of the magnetic ring 30 installed with a gap between them.

[0052] As can be understood, the magnetic core center post 40 may be fixedly connected to the inner wall of the magnetic ring 30 by means of adhesive, welding, etc., or the magnetic core center post 40 may be integrally molded with the magnetic ring 30.

[0053] Optionally, in some embodiments, the magnetic core center post 40 may be a first portion 41 connected to the inner wall of the magnetic ring 30; and a second portion 42 connected to the inner wall of the magnetic ring 30, the first portion 41 and the second portion 42 being spaced apart along a direction perpendicular to the direction in which the N AC metal rows 10 face the boost metal rows 20.

[0054] 5 , the magnetic core center post 40 may include a first portion 41 and a second portion 42, the first portion 41 and the second portion 42 being spaced apart along a direction perpendicular to the direction in which the N AC metal rows 10 face the booster metal rows 20, and both being connected to the inner wall of the magnetic ring 30. For example, assuming that the magnetic ring 30 is a rectangular magnetic ring 30, the N AC metal rows 10 and the booster metal rows 20 may be located on the left and right sides of the rectangular magnetic ring 30, respectively, where the first portion 41 may be connected to the upper inner wall of the rectangular magnetic ring 30 and the second portion 42 may be connected to the lower inner wall of the rectangular magnetic ring 30, and the first portion 41 and the second portion 42 may be spaced apart to form an air gap 31.

[0055] Optionally, in some embodiments, first portion 41 is positioned directly opposite second portion 42 .

[0056] As can be seen, the first portion 41 and the second portion 42 may be disposed directly opposite each other so that the size of the air gap 31 can be more accurately adjusted based on the maximum power required in the boost charging mode. In this way, the size of the air gap 31 can be calculated based on the distance between the first portion 41 and the second portion 42 and the area of the opposing surfaces of the first portion 41 and the second portion 42. In other words, once the area of the opposing surfaces of the first portion 41 and the second portion 42 is determined, the size of the air gap 31 can be optimized according to demand by adjusting the distance between the first portion 41 and the second portion 42, so that the differential mode inductance provided by the air gap 31 can better meet actual demands and further improve the filtering effect of the filter assembly.

[0057] Optionally, in some embodiments, the magnetic core center post 40 is spaced apart from the inner wall of the magnetic ring 30 .

[0058] As can be seen, magnetic conductors generate eddy currents due to electromagnetic induction in an alternating magnetic field, which causes uneven distribution of the amplitude and phase of the magnetic field strength and magnetic induction strength within the material, and causes the phase of the magnetic induction strength to lag behind the phase of the magnetic field strength, increasing some energy loss, which is called eddy current loss. The magnetic field due to the magnetic potential of the air gap 31 cuts the N AC metal rows 10 and the boost metal rows 20, causing eddy current loss.

[0059] As shown in FIG. 6 , in this embodiment, the magnetic core center post 40 may be spaced apart from the inner wall of the magnetic ring 30. In other words, the magnetic core center post 40 and the magnetic ring 30 are independent of each other, and at least two air gaps 31 may be formed between the magnetic core center post 40 and the inner wall of the magnetic ring 30. The size of the air gaps 31 may be determined based on the maximum power in the boost charging mode. Therefore, if the maximum power in the boost charging mode is the same, the number of air gaps 31 increases, i.e., the size of each air gap 31 decreases. Accordingly, the edge effect of the magnetic field generated by the magnetic potential of the air gap 31 weakens as the size of the air gap 31 decreases. Furthermore, the eddy current loss of the N AC metal arrays 10 and the N boost metal arrays 20 decreases as the edge effect weakens.

[0060] Optionally, in some embodiments, the number of magnetic core center posts 40 is M, and the M magnetic core center posts 40 are spaced apart along a direction perpendicular to the direction in which the N AC metal rows 10 face the boost metal rows 20, where M is an integer greater than 1.

[0061] In this embodiment, the number of magnetic core center posts 40 may be two or more, and N AC metal rows 10 may be spaced apart along a direction perpendicular to the direction toward the boost metal rows 20. In this way, an air gap 31 can be formed between the magnetic core center post 40 adjacent to the magnetic ring 30 and the inner wall of the magnetic ring 30, and an air gap 31 can also be formed between two adjacent magnetic core center posts 40.

[0062] In this embodiment, the M magnetic core center pillars 40 can further increase the number of air gaps 31, thereby further reducing the size of a single air gap 31, weakening the edge effect of the magnetic field, and further reducing the eddy current loss of the N AC metal rows 10 and boost metal rows 20.

[0063] Optionally, referring to FIGS. 7a to 7d, in some embodiments, the boost metal array 20 and the N AC metal arrays 10 are both arranged along a first direction (X); Alternatively, the boost metal array 20 and the N AC metal arrays 10 are both arranged along the second direction (Y), Or, one of the boost metal array 20 and the N AC metal arrays 10 is arranged along a first direction (X), and the other is arranged along a second direction (Y); Here, the first direction (X) is perpendicular to the direction in which the N AC metal rows 10 face the boost metal rows 20, and the second direction (Y) is parallel to the direction in which the N AC metal rows 10 face the boost metal rows 20.

[0064] For ease of description of the embodiments of the present application, the direction in which the N AC metal rows 10 face the boost metal row 20 will be referred to as the horizontal direction in the following description.

[0065] 7a, the boost metal row 20 and the N AC metal rows 10 may be arranged along a direction perpendicular to the direction in which the N AC metal rows 10 face the boost metal row 20. In other words, the boost metal row 20 and the N AC metal rows 10 may be arranged along a vertical direction.

[0066] 7b, the boost metal row 20 and the N AC metal rows 10 may be arranged in a direction parallel to the direction in which the N AC metal rows 10 face the boost metal row 20. In other words, the boost metal row 20 and the N AC metal rows 10 may be arranged in a horizontal direction.

[0067] 7c, the boost metal rows 20 may be arranged along a direction perpendicular to the direction in which the N AC metal rows 10 face the boost metal rows 20, or the N AC metal rows 10 may be arranged along a direction parallel to the direction in which the N AC metal rows 10 face the boost metal rows 20. In other words, the boost metal rows 20 may be arranged along a vertical direction, and the N AC metal rows 10 may be arranged along a horizontal direction.

[0068] 7d, the boost metal rows 20 may be arranged in a direction parallel to the direction in which the N AC metal rows 10 face the boost metal rows 20, or the N AC metal rows 10 may be arranged in a direction perpendicular to the direction in which the N AC metal rows 10 face the boost metal rows 20. In other words, the boost metal rows 20 may be arranged in a horizontal direction, and the N AC metal rows 10 may be arranged in a vertical direction.

[0069] It should be understood that the installation directions of the booster metal array 20 and the N AC metal arrays 10 are merely listed as part of the installation method, and are merely provided to facilitate understanding of the technical content of the present application, and are not intended to limit the technical solution of the present application itself. For example, in some application scenarios, the booster metal array 20 and the N AC metal arrays 10 may be installed at a relative incline within the magnetic ring 30 according to actual needs, and are not specifically limited herein.

[0070] In this embodiment, the direction and position of the boost metal row 20 and the N AC metal rows 10 can both be adjusted based on the actual deployment and space of the motor drive system, so that the structure of the filter assembly is not limited by the position of the metal row, and the degree of freedom of the filter assembly is higher.

[0071] Optionally, in some embodiments, the cross-sectional shape of the magnetic ring 30 is rectangular, circular, or elliptical.

[0072] In this embodiment, the shape of the magnetic ring 30 can also be selected according to actual needs. For example, as shown in FIG. 6, the cross-sectional shape of the magnetic ring 30 can be rectangular, i.e., the magnetic ring 30 can be a rectangular magnetic ring 30. As shown in FIG. 8, the cross-sectional shape of the magnetic ring 30 can be elliptical, i.e., the magnetic ring 30 can be an elliptical magnetic ring 30. As can be appreciated, the cross-sectional shape of the magnetic ring 30 can also be circular, etc., which further improves the flexibility of the filter assembly.

[0073] The embodiments of the present application further provide an inverter, which may include the above filter assembly. The inverter adopts the above filter assembly structure, which can solve the problem of filtering failure caused by saturation heat of the magnetic ring in both the driving mode and the boost charging mode, that is, the inverter can meet the filtering needs in both modes and has a higher filtering effect.

[0074] The embodiments of the present application further provide a motor drive system, which may include the above inverter. In this way, when the motor drive system is in the driving mode or the boost charging mode, the magnetic ring will not cause filtering failure due to saturation heat, and the filtering effect of the motor drive system is higher and more reliable.

[0075] The embodiments of the present application further provide a vehicle, which may include the above-mentioned motor drive system, in which the filtering effect of the motor drive system is stronger and the reliability is higher, thereby improving the driving comfort of the vehicle and the safety of charging the vehicle.

[0076] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and equivalents may be substituted for the components therein without departing from the scope of the present application. In particular, unless there is a structural conflict, the technical features recited in each embodiment may be combined in any manner. The present application is not limited to the specific embodiments disclosed in the specification, but includes all technical solutions falling within the scope of the claims. [Explanation of symbols]

[0077] 10: AC metal column, 20: Boost metal column, 30: magnetic ring, 31: air gap, 40: magnetic core center pillar, 41: first part, 42: second part.

Claims

1. 1. A filter assembly comprising: N alternating current metal rows, at least some of which are stacked, where N is an integer greater than 1; a boost metal string disposed on one side of the N AC metal strings; a magnetic ring disposed around the N AC metal rows and the boost metal row, the N AC metal rows and the boost metal row being positioned within the magnetic ring and facing each other at a distance.

2. The filter assembly of claim 1 , wherein orthogonal projections in a stacking direction of any two of the N alternating current metal rows overlap.

3. 2. The filter assembly of claim 1, further comprising a magnetic core center post disposed within the magnetic ring and positioned between the N AC metal rows and the boost metal row, wherein an air gap is provided within the magnetic ring, the air gap communicating with the N AC metal rows and the boost metal row.

4. The filter assembly of claim 3 , wherein the magnetic core center post is connected to an inner wall of the magnetic ring.

5. The magnetic core center pillar is a first portion connected to an inner wall of the magnetic ring; 4. The filter assembly of claim 3, further comprising: a second portion connected to an inner wall of the magnetic ring, the first portion and the second portion being spaced apart along a direction perpendicular to a direction in which the N AC metal rows face the boost metal row.

6. The filter assembly of claim 5 , wherein the first portion is positioned directly opposite the second portion.

7. The filter assembly of claim 3 , wherein the magnetic core center post is spaced apart from an inner wall of the magnetic ring.

8. 8. The filter assembly of claim 7, wherein the number of magnetic core columns is M, the M magnetic core columns are spaced apart along a direction perpendicular to a direction in which the N AC metal columns face the boost metal columns, and M is an integer greater than 1.

9. The boost metal array and the N AC metal arrays are both arranged along a first direction; Alternatively, the boost metal row and the N AC metal rows are both arranged along a second direction; Alternatively, one of the boost metal array and the N AC metal arrays is arranged along the first direction, and the other is arranged along the second direction; 2. The filter assembly of claim 1, wherein the first direction is perpendicular to a direction in which the N alternating current metal columns face the boosted metal column, and the second direction is parallel to a direction in which the N alternating current metal columns face the boosted metal column.

10. The filter assembly of claim 1 , wherein the magnetic ring has a cross-sectional shape that is rectangular, circular, or elliptical.

11. An inverter comprising a filter assembly according to any one of claims 1 to 10.

12. A motor drive system including the inverter of claim 11.

13. A vehicle including the motor drive system of claim 12.

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