Interference suppression filter arrangement

Abstract

Interference suppression filter arrangement (1) with a busbar (3) extending through a housing (2) and having self-inductance, and with a printed circuit board (4) arranged in the housing and electrically connected to the busbar, on which at least two capacitors (46a, b) are arranged, wherein the printed circuit board has a ground connection for connection to a ground element, characterized in that the housing (2) is made of an electrically non-conductive material and has a pot-like shape with an opening (25) and comprises a ground rail (5) projecting from the opening of the housing (2) which is attached to the printed circuit board (4), wherein the interior of the housing with the components arranged therein is potted with a potting material for closing the housing opening (25) for thermal and / or mechanical decoupling of the components.

Description

[0001] The invention relates to a noise suppression filter arrangement, in particular a noise suppression filter arrangement for a motor vehicle such as cars, quads or motorcycles, with a busbar extending through a housing and having self-inductance, and with a printed circuit board arranged in the housing and electrically connected to the busbar, on which at least two capacitors are arranged, wherein the printed circuit board has a ground connection for connection to a ground element.

[0002] In principle, interference suppression filter arrangements for electrical circuits in a motor vehicle's electrical system are known, which include an inductor that can be switched into or integrated into a line to be suppressed and, furthermore, have at least two capacitors connected in an electrical link from the inductor to ground. DE 3 625 368 A1 discloses an interference suppression filter for achieving good high-frequency attenuation characteristics at a continuous current load of at least 200 A, in which a conductor in the form of a busbar is connected in series with the line to be suppressed, the self-inductance of the busbar being sufficient to provide the desired high-frequency attenuation characteristics. The use of two capacitors to provide the necessary capacitance is also disclosed, allowing for a comparatively small design.

[0003] Building on this state of the art, the generic patent DE 20 2019 106 744 U1 describes an interference suppression filter for the powertrain of vehicles, comprising a housing through which the busbar is routed. A printed circuit board with at least two capacitors is mounted on the busbar, the busbar having its own inductance, and the at least two capacitors being arranged side by side on a side of the printed circuit board facing away from the busbar.

[0004] To design the generic interference suppression filter, considerable effort is expended to provide a distance between the capacitors and the ground plane, which are located on the side of the circuit board facing away from the busbar. The ground plane is designed as a U-shaped profile, with one lower leg soldered to the circuit board and one upper leg welded to the inside of the housing to provide a ground connection.

[0005] Particularly due to the described design and arrangement of the grounding plate inside the housing and its relative position to the capacitors, the required installation volume of the generic interference suppression filter is still comparatively large. Furthermore, the complex construction of the generic interference suppression filter requires significant manufacturing effort, which, however, is not always sufficient to reliably prevent internal short circuits between the components of the interference suppression filter, especially under strong mechanical stresses such as those caused by vibrations during operation.

[0006] German patent application DE 10 2017 100 381 A1 relates to an interference filter with a pot-shaped housing and at least one first busbar and one second busbar, as well as two capacitors arranged on a printed circuit board. The pot-shaped housing may be potted. German patent application DE 10 2018 202 663 A1 relates to an interference filter with a pot-shaped housing.

[0007] Therefore, the present invention aims to at least partially eliminate the described disadvantages of a generic interference suppression filter.

[0008] The present invention solves this problem with a noise suppression filter arrangement comprising the features of claim 1. The noise suppression filter arrangement according to the invention comprises a busbar extending through a housing and having self-inductance, as well as a printed circuit board arranged in the housing and electrically connected to the busbar, on which at least two capacitors are arranged, the printed circuit board having a ground connection for connection to a ground element. The noise suppression filter arrangement according to the invention is characterized in that the housing is made of an electrically non-conductive material.is made of insulating material, has a pot-like shape with an opening and includes as a grounding element a grounding rail protruding from the opening of the housing, which is attached to the circuit board, wherein the interior of the housing with the components arranged therein is potted with a potting material to close the housing opening for thermal and / or mechanical decoupling of the components.

[0009] The interference suppression filter arrangement designed according to the invention is particularly suitable for suppressing interference in the electrical circuits of motor vehicles, such as cars, quads, or motorcycles, in which a busbar is provided for connecting or integrating it into the line to be suppressed, wherein the arrangement comprises a capacitance device in the form of at least two capacitors, which can be arranged in the connection leading from the busbar to ground. The inductance of the interference suppression filter is essentially the self-inductance of the busbar.The invention is based on the fundamental idea of ​​simplifying the construction of an interference suppression filter by using a non-conductive housing with a pot-shaped form and a potted opening. A grounding element, designed as a ground rail, protrudes from this potted opening. Simultaneously, the potting of at least the busbar, circuit board, and grounding element provides a comparatively high level of insensitivity to operating forces and / or environmental influences such as temperature and humidity compared to other interference suppression filters of this type. In addition to reducing manufacturing costs, this design particularly enables greater reliability against failures when very high operating forces are applied to the interference suppression filter assembly.

[0010] It should be noted that the term "pot-shaped" housing is to be understood broadly and generally includes housings that have a bottom section and an adjoining, substantially closed side section, as well as an opening through which the populated circuit board and the ground busbar can be inserted into the housing. This opening may be defined by the side section of the housing. Preferably, the housing may be cuboid in shape, with the busbar extending through associated feedthroughs on two opposite end faces of the housing, such that the busbar projects beyond the housing on both end faces and extends outwards towards it.

[0011] The term "ground rail" can generally refer to a grounding element, i.e., a conductor designed for connection to a ground terminal, where the grounding element is at least sufficiently robust to be self-supporting. The term "electrically non-conductive material" can refer to a material with an electrical conductivity lower than that of a semiconductor, in particular lower than 10⁻⁶ Ω. -8 S cm -1 Such a material can also be described as an insulating material.

[0012] Further advantageous features and developments of the invention are specified in the following general description, the figures, the figure description and the dependent claims.

[0013] Advantageously, the ground rail can be designed in one piece, for example as a stamped sheet metal part, so that the ground rail can be attached electrically and / or mechanically to the circuit board alone, and can protrude from the potted opening of the housing with at least one free end, which facilitates the manufacture of the interference suppression filter arrangement according to the invention.

[0014] Preferably, the potting material may contain an electrically insulating material, or the cured potting material may be electrically insulating, so that, for example, otherwise necessary spacing between electronic components within the housing of the interference suppression filter according to the invention can be reduced compared to conventional interference suppression filters, without short circuits resulting during operation due to external forces caused by the movement of individual components relative to each other.

[0015] Preferably, the busbar can be designed in the simple shape of an elongated cuboid, that is, with a rectangular cross-section, particularly over its entire length, which simplifies its manufacture. Depending on the design, however, it is also possible to design the cross-section of the busbar differently, for example oval or round, or to design it with different cross-sections depending on its longitudinal position.

[0016] In one embodiment, a main surface of the busbar, which may be defined in particular by a longitudinal and a transverse direction of the busbar, can face a bottom section of the housing, with the circuit board being arranged between the busbar and the ground rail in the direction of the housing opening. Preferably, a main surface of the busbar, a main surface of the circuit board, and a main surface of the ground rail can be arranged parallel to each other, which facilitates their relative arrangement for a compact design.

[0017] Advantageously, the at least two capacitors can be arranged on one side (main surface) of the circuit board facing the current rail. It is particularly advantageous for the ground rail to be attached to the side (main surface) of the circuit board facing away from the current rail, in particular electrically and / or mechanically, so that an optimal spacing between the capacitors and the ground rail is achieved within the housing of the interference suppression filter according to the invention, which can be advantageous for the damping characteristics of the interference suppression filter according to the invention.

[0018] A particularly compact design of the interference suppression filter according to the invention can be achieved by arranging the at least two capacitors on the circuit board on or in the area of ​​opposing narrow faces of the busbar, such that both capacitors essentially surround the busbar in the area of ​​its narrow faces. Depending on the embodiment, the capacitors can extend beyond the thickness of the busbar towards the bottom of the housing, so that the thickness of the busbar, which can be between 4 mm and approximately 10 mm depending on the embodiment, is available as additional installation height for the capacitors without having to increase the height of the housing.

[0019] It may be advantageous to provide that the busbar has a contact device, in particular a bore, at each of its end sections protruding from the housing for contacting and fastening to or on the electrical line to be suppressed.

[0020] As already described above, the circuit board of the interference filter according to the invention can be aligned approximately parallel to a main surface of the busbar, wherein the circuit board can be mechanically fastened to the busbar using at least one spacer element, and wherein the mechanical connection can simultaneously serve as an electrical contact. Preferably, the space between the circuit board and the busbar can be filled with potting material for mechanical stabilization of the components and for maintaining the distance between them.

[0021] Advantageously, to achieve mechanical and electrical fastening of the printed circuit board to the busbar, at least one spacer element may comprise a spacer sleeve. This sleeve is supported by a radial collar on the side of the printed circuit board facing away from the busbar and extends through the printed circuit board to the busbar to define a predetermined distance. A fastening element, such as a rivet or a screw bolt, may extend through the spacer sleeve from the side of the printed circuit board facing away from the busbar to the busbar for fastening and contacting the printed circuit board to the busbar. The collar of the spacer sleeve may be soldered to an associated conductor track on the printed circuit board for mechanical fastening and / or electrical contact.In this way, it is advantageous to establish both an electrical and a mechanical connection between the circuit board and the busbar by defining a predetermined distance between the two components.

[0022] The interference suppression filter arrangement according to the invention can be designed and configured to provide high-frequency interference pulses in the range of 10 kHz to several hundred MHz by specifying a respective self-inductance of the busbar and a predetermined total capacitance of the at least two capacitors used at a continuous current load of 200A or even 300A.

[0023] To support the busbar within the housing, it may be advantageous for the housing to have a support section that is offset from the bottom section towards the opening. This support section extends between two opposing end faces of the housing and supports the busbar. To avoid unnecessary material expenditure in the housing design, a honeycomb structure may be provided on the outside of the housing beneath the support section. It may also be provided that one or more cavity sections (partial cavities) are arranged on the inside of the housing, transversely to the support section, for the partial accommodation of at least one of the capacitors. Such a partial cavity may be located laterally to the support section, i.e.,arranged transversely to this and having a side wall and a bottom wall, wherein each cavity may be filled with potting material depending on the embodiment, unless it is at least partially filled by at least one capacitor.

[0024] To reduce the overall size of the interference suppression filter according to the invention, it is advantageous to provide that the ground rail runs inside the housing approximately perpendicular to the longitudinal axis of the busbar, and that the busbar can be mechanically and electrically attached to the circuit board. The attachment can be provided, in particular, by means of at least one screw terminal or rivet terminal, which, in addition to providing contact in a direction perpendicular to the circuit board, ensures a predetermined distance between the ground rail and the circuit board. Preferably, the screw or rivet terminal can be soldered to the circuit board for contact and mechanical attachment, and a screw bolt or rivet extending through the ground rail can be attached to the respective terminal.

[0025] In a particularly advantageous embodiment, which provides stable and secure mounting and / or contacting of the interference suppression filter according to the invention even under high operating forces, the ground rail can advantageously be U-shaped in its longitudinal direction, with a base section extending parallel to the circuit board and two legs extending perpendicularly from the base section towards the housing opening, each of which has a contacting and / or mounting section protruding from the housing. In another embodiment, the ground element can also have a single contacting and / or mounting section protruding from the housing. As shown, the longitudinal direction of the ground rail can be oriented transversely to the longitudinal axis of the busbar. As further shown, the ground rail can preferably be formed as a stamped and bent part.

[0026] Preferably, the at least two capacitors can be designed as flat-wound capacitors or film capacitors, with each capacitor being potted in its own housing. Preferably, the at least two capacitors are electrically connected in parallel with a total capacitance in the range of 7 to 12 µF.

[0027] As stated above, according to the invention, the components arranged inside the housing are potted with potting material, in particular such that the busbar is encased with potting material, potting material is arranged between the busbar and the circuit board and / or potting material embeds the at least two capacitors at least partially, so that even high operating forces cannot have any influence on the relative arrangement of the components inside the housing of the interference suppression filter according to the invention.

[0028] Advantageously, the at least two capacitors can each be potted in their own housing with a first potting material, and the components located inside the housing, including the capacitors, can be potted with a second potting material that differs from the first.

[0029] To facilitate the potting of the components arranged inside the housing of the interference suppression filter according to the invention, it can be advantageously provided that the circuit board and / or busbar has a plurality of bores which serve for venting and for introducing casting material into the volume sections facing the bottom section of the housing and which are consequently at least partially filled with potting material after the potting process step. These bores in the circuit board and / or busbar can be particularly advantageous for encasing the busbar and for filling a gap between the busbar and the circuit board with potting material.

[0030] According to the invention, the housing of the interference suppression filter is made of an electrically non-conductive, i.e., insulating, material, in particular a plastic material. This eliminates the need for otherwise necessary insulating covers at the end of the busbar to the housing, which would otherwise close the end faces of the housing feedthroughs for the busbar. Instead, according to the invention, the housing can be provided with an outwardly projecting projection in the area of ​​the feedthroughs, each with a feedthrough that corresponds to the cross-section of the busbar in the area of ​​the feedthrough. In one embodiment, a fluid-tight connection between the busbar and the housing in the area of ​​the recesses can be created by potting the interior of the housing.The overhang is created so that further sealing measures are unnecessary, especially to protect the circuit board with the capacitors from contamination and moisture.

[0031] Advantageously, the housing of the interference suppression filter arrangement according to the invention, which is essentially open and to be potted, can be constructed in one piece. However, it can also be provided that the housing can be assembled from several parts before potting, in particular by means of associated snap-fit ​​elements, with any gaps being closed by potting the interior of the housing with potting material.

[0032] The invention is explained below by describing one embodiment together with variations, with reference to the accompanying figures, wherein Fig. 1 an embodiment of an interference suppression filter arrangement designed according to the invention in an exploded view, Fig. 2 the in Fig. 2 shown interference suppression filter arrangement according to the invention before the manufacturing step of potting the components received inside the housing with a potting material, Fig. 3 a top view of the housing of the interference suppression filter according to the invention Fig. 1, Fig. 4 the components of the interference suppression filter according to the invention inserted into the housing in the assembled state, and Fig. 5 a section through the representation of the Fig. 2, where the cutting plane is perpendicular to the power rail and perpendicular to the ground rail.

[0033] The construction of a noise suppression filter 1 designed according to the invention is shown. Fig. Figure 1 shows an exploded view. This comprises an open housing 2, which is rectangular in shape here, with opposing end walls 20a, b and opposing side walls 21a, b extending approximately perpendicularly from these, forming a closed wall that is closed on one side by a bottom section 22. In the described embodiment, the housing 2 has an opening 25 opposite the bottom section, which here encompasses the entire area enclosed by the end walls and the side walls and defined by the circumferential edge 26. A vertically extending projection 23 with a feedthrough 24 is provided on each of the end walls 21a, b for receiving the busbar 3, which extends out of the housing 2 with a respective end section 30a, b.Each end section 30a, b of the busbar 3 has an associated bore 31a, b for switching the interference suppression filter 1 according to the invention into a power line to be suppressed.

[0034] In the described embodiment, the busbar 3 can be made of a corrosion-resistant copper-zinc alloy and may additionally have a NiSn coating. Here, the busbar 3 is rectangular and, depending on the embodiment, can have dimensions adapted to the specific application, for example, a thickness between 4 and 8 mm, a width in the transverse direction to the longitudinal extent between 10 and 30 mm, and a length between 60 and approximately 120 mm. In a particularly advantageous embodiment, the busbar can be provided with a thickness of 6 mm, a width (transverse extent) of 20 mm, and a length between 100 mm and 150 mm, in particular 120 mm.

[0035] In the described embodiment, the interference suppression filter arrangement may include at least two capacitors 46a, b which are attached to a circuit board 4.

[0036] The capacitors 46a, b are arranged on a main surface or side of the circuit board 4 that faces the busbar 3, as shown in the illustration of the Fig. In 1, only one of the two capacitors is visible.

[0037] In the described embodiment, the circuit board 4 is spaced apart from the circuit board by means of spacers 42a, b, wherein an associated screw bolt 43a, b extends through the respective spacer 42a, b and is screwed into an associated thread in the busbar 3 for fastening. The spacers 42a, b each have a collar which is arranged and soldered to the side of the circuit board facing away from the busbar and thus serve both for the electrical and mechanical connection of the circuit board 4 to the busbar 3.

[0038] On the main surface or side of the circuit board 4 facing away from the busbar, at least one, in this case two, screw terminals 44a, b are provided in the described embodiment, which are soldered to the circuit board as solid metal elements. These screw terminals comprise a mounting thread and a contact surface on which a ground element, here designed as a ground rail 5, rests, the ground rail being attached to the circuit board by means of screw bolts 45a, b, which are screwed into the thread of the screw terminal.

[0039] The ground rail 5 can comprise a base section 50 extending parallel to the power rail 3 or to the circuit board 4, with a longitudinal extent substantially perpendicular to the power rail 3. A leg 51a, b can extend approximately perpendicularly from the base section 50 of the ground element, running approximately parallel to the side walls 21a, b of the housing 2 in the installed position. In the installed position of the ground rail 5, it is adapted to the mounting location on the circuit board 4 and to the height of the side walls 21a, b and end walls 20a, b in the direction of the opening 25 such that the legs 51a, b extend just beyond the boundary edge 26 formed by the side walls and end walls.In the described embodiment, fastening and connection sections 52a, b are attached to the free ends of these legs 51a, b, which in turn are U-shaped with fastening feedthroughs for fastening the interference suppression filter 1 according to the invention to the vehicle as well as connection holes in the area of ​​the legs for establishing a ground connection for the interference suppression filter according to the invention.

[0040] As described above and as shown in the exploded view of the Fig. As shown in Figure 1, the circuit board 4 is screwed to the busbar 3 at a predetermined distance between these two components. Furthermore, the ground rail 5 is screwed to the circuit board on the main surface or side opposite the busbar 3, with the screw terminals 44a, b having a predetermined extent perpendicular to the circuit board, so that the ground rail is also screwed to the circuit board 4, resting on the screw terminals 44a, b and spaced apart from the circuit board 4.

[0041] After screwing the circuit board 4, equipped with the capacitors 46a, b, to the busbar and screwing the ground rail 5 to the circuit board, the interior of the housing 2, with the components arranged therein, is potted with a non-conductive, i.e., insulating, potting material. Depending on the embodiment, the potting material can completely fill the remaining cavities within the housing 2 between the components and close the opening of the housing defined by the circumferential rim 26. The illustration of the Fig. The potting compound 6, specified and intended to be taken from inside the housing, also includes material sections of potting material that lie between the components arranged in the housing 2.

[0042] In another embodiment, it may also be provided that the potting material does not completely fill the remaining cavity inside the housing. In any case, however, it may be provided according to the invention that the potting material terminates with the circumferential edge 26 of the housing, such that the opening 25 of the housing defined by the circumferential edge is closed, with the ground rail projecting from the housing as described.

[0043] In another embodiment, it can also be provided that although the housing opening is closed by potting material, the edge 26 of the housing is free of potting material, and an additional cover can be placed on the edge 26 of the housing.

[0044] In one embodiment, the housing 2 may also have vent holes, for example in its base section, to facilitate the potting process and to ensure that all cavities are filled with the potting material. After the potting process, these vent holes are also filled with potting material, so that the interior of the housing 2 is reliably protected against weathering and mechanical impacts.

[0045] Fig. Figure 2 shows the state before potting in a preliminary stage of the manufacturing process of the interference suppression filter 1 according to the invention. The circuit board 4 and the inner surfaces of the end walls 20a, b, as well as the side walls 21a, b, are clearly dimensioned and arranged relative to each other such that a circumferential gap exists for the potting material to flow into the bottom area of ​​the housing and thus for potting the busbar 3. Fig. 2 It is also evident that the fastening and connection sections 52a, b of the ground rail 5 extend beyond the edge 26 defining the opening 25 of the housing 2 for fastening and / or contacting the interference suppression filter according to the invention.

[0046] Fig. Figure 3 shows the housing 2 for the interference suppression filter arrangement 1 according to the invention. Fig. 1 in a top view looking at the opening 25 defined by the rim 26. It is evident that the housing has an internal support section 29 extending between the end walls 20a, b for supporting the busbar, wherein, in the transverse direction towards the bottom section, partial cavities 28a, b are formed next to the support section 29 or the busbar in its installed position, in particular for receiving at least one capacitor 46a, b extending from the circuit board 4 towards the busbar 3, see Fig. 1.

[0047] Fig. 4 shows the representation of the Fig. 2 with the housing (virtually) removed to show the relative arrangement of the components of the interference suppression filter 1 according to the invention within the housing. The two capacitors 46a, b used here are visibly spaced apart from each other in the transverse direction to the busbar 3 and are arranged on the side of the circuit board 4 facing the busbar and extend laterally in their installed position towards the bottom section of the housing, depending on the embodiment possibly in the Fig. 3 into the specified partial cavity 28a, b. From Fig. 4 also shows the design of the spacer sleeves 42a, b with a respective mounting and soldering collar with which they are soldered to the side of the circuit board 4 facing away from the busbar, wherein an associated screw bolt 43a, b is supported on this collar, extends through the respective spacer sleeve 42a, b and is screwed into an associated thread of the busbar 3.

[0048] Fig. 5 shows the arrangement of the Fig. 2 in a section parallel and approximately in the middle to the busbar 3. The bottom section 22 of the housing 2 in the area of ​​the support section 29 can be seen to have a honeycomb structure to increase the stability of the housing as well as for technical reasons to save material and to avoid shrinkage effects.

[0049] It should be noted that the invention has been explained with reference to the described embodiment, but is not limited thereto. Instead, the invention also includes all variations of the described embodiments encompassed by the claims. Reference symbol list 1 interference filter arrangement, interference filter 2 cases 3 busbar 4 circuit boards 5 Ground rail, mounting rail 6 potting compounds 20a, b End wall 21a, b side wall 22 floor section 23a, b Cantilever 24 Implementation 25 Opening 26 Rand 28a, b partial cavity 29 Support section 30a, b End section 31a, b bore 40a Main surface of the circuit board facing away from the busbar 40b Main surface of the circuit board facing the busbar 41a, b Capacitor 42a, b Spacer sleeve, spacer element 43a, b screw, bolt 44a, b Screw terminal 45a, b screw, bolt 46a, b Capacitor 50 Basic section 51a, b thigh 52a, b Fastening and connection section

Claims

Interference suppression filter arrangement (1) with a busbar (3) extending through a housing (2) and having self-inductance, and with a printed circuit board (4) arranged in the housing and electrically connected to the busbar, on which at least two capacitors (46a, b) are arranged, wherein the printed circuit board has a ground connection for connection to a ground element, characterized in that the housing (2) is made of an electrically non-conductive material and has a pot-like shape with an opening (25) and comprises a ground rail (5) projecting from the opening of the housing (2) which is attached to the printed circuit board (4), wherein the interior of the housing with the components arranged therein is potted with a potting material for closing the housing opening (25) for thermal and / or mechanical decoupling of the components. Interference suppression filter arrangement (1) according to claim 1, characterized in that a main surface of the busbar (3) faces a bottom section (22) of the housing (2) and the circuit board (4) is arranged in the direction of the housing opening (25) between the busbar (3) and the ground rail (5). Interference suppression filter arrangement (1) according to claim 1 or 2, characterized in that the at least two capacitors (46a, b) are arranged on one side of the circuit board (4) facing the busbar (3). Interference suppression filter arrangement (1) according to claim 1, 2 or 3, characterized in that the at least two capacitors (46a, b) arranged on the circuit board (4) are arranged on opposite narrow side faces of the busbar (3). Interference suppression filter arrangement (1) according to one of claims 1 to 4, characterized in that the ground rail (5) is attached to the side of the circuit board (4) facing away from the current rail (3). Interference suppression filter arrangement (1) according to one of claims 1 to 5, characterized in that the busbar (3) has a substantially rectangular shape and has a contact device on each of its end sections (30a, b) projecting from the housing (2) for contacting an electrical line to be suppressed. Interference suppression filter arrangement (1) according to one of claims 1 to 6, characterized in that the circuit board (4) is aligned approximately parallel to a main surface of the busbar (3) and is attached to it at a distance using at least one spacer element. Interference suppression filter arrangement (1) according to claim 7, characterized in that the at least one spacer element comprises a spacer sleeve (42a, b) which is supported by a radial collar on a side of the printed circuit board (4) facing away from the busbar (3) and extends through the printed circuit board to the busbar (3) to define a distance, wherein a fastening element such as a rivet or a screw bolt (43a, b) extends through the spacer sleeve (42a, b) from the side of the printed circuit board (4) facing away from the busbar (3) to the busbar for fastening and contacting the printed circuit board to or with the busbar. Interference suppression filter arrangement (1) according to one of claims 1 to 8, characterized in that the housing (2) has a support section (29) offset from the bottom section (22) of the housing in the direction of the opening (25), which extends between opposing end walls (20a, b) of the housing (2) and which supports the busbar (3). Interference suppression filter arrangement (1) according to one of claims 1 to 9, characterized in that the housing (2) is designed to provide inside a partial cavity (28a, b) assigned to a respective capacitor (46a, b), into which the respective capacitor extends. Interference suppression filter arrangement (1) according to one of claims 1 to 10, characterized in that the ground rail (5) runs inside the housing (2) approximately perpendicular to the longitudinal extent of the busbar (3) and is mechanically and electrically attached to the circuit board (4). Interference suppression filter arrangement (1) according to one of claims 1 to 11, characterized in that the ground rail (5) is U-shaped in the longitudinal direction with a base section (50) extending parallel to the circuit board (4) and two legs extending perpendicularly from the base section and in the direction of the housing opening, to which contacting and / or fastening sections (52a, b) protruding from the housing (2) are connected. Interference suppression filter arrangement (1) according to one of claims 1 to 12, characterized in that the at least two capacitors (46a, b) are each potted with a first potting material and the components located inside the housing (2) are potted with a second potting material. Interference suppression filter arrangement (1) according to one of claims 1 to 13, characterized in that the circuit board (4) and / or the busbar has a plurality of bores which are filled with potting material. Interference suppression filter arrangement (1) according to one of claims 1 to 14, characterized in that the housing (2) has on opposite end faces a projection (23a, b) with a passage (24) for the passage of an associated end section (30a, b) of the busbar (3).

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