Electrical circuit arrangement

Abstract

The invention relates to an electrical circuit arrangement (2) for two electric machines (6, 7) of a motor vehicle, comprising a first inverter (3), a second inverter (4), a housing (5) accommodating the inverters (3, 4), and a filter circuit (15), wherein the housing (5) has a receiving structure (28) and a housing wall element (16) inserted into the receiving structure (28) and comprising a circuit holder (18) which comprises or forms a stiffening structure (19) on the element and holds the filter circuit (15).

Description

[0001] P241348

[0002] - 1 - Electrical circuit arrangement

[0003] The invention relates to an electrical circuit arrangement for two electric machines of a motor vehicle, comprising a first inverter, a second inverter, a housing to accommodate the inverters and a filter circuit.

[0004] In the development of electric vehicles, axles have been proposed in which each wheel has its own electric motor for its drive. This design typically refers to the rear axle of a motor vehicle, particularly a passenger car. Such arrangements of two electric motors require electrical circuitry that includes an inverter for each motor to connect the electric motor to the vehicle's high-voltage electrical system (primarily DC) and to enable control. These electrical circuitry arrangements, in which two inverters are housed in a single unit, are also known as 2-in-1 inverters.

[0005] In addition to other components for creating a separate or common intermediate circuit for the inverters, preferably comprising at least one intermediate circuit capacitor, such electrical circuit arrangements often also include a filter circuit to at least partially filter out interference caused by switching operations in the inverters and to avoid, as far as possible, feedback effects on the DC-side intermediate circuit and the high-voltage network as a whole. Such a filter circuit can also be referred to as an EMC filter.

[0006] A significant problem in modern motor vehicles in general, but especially when using two electric motors with associated inverters, is the limited installation space in the vehicle in the area of ​​each axle, for example, the rear axle. Therefore, in DE 102021 115272 A1, an electrical circuit arrangement was proposed that enables a more compact design and thus a space-saving arrangement of the electrical circuit. This includes P241348.

[0007] -2 -The electrical circuit arrangement therein comprises a housing with a plate section extending inside the housing. The plate section divides the interior of the housing into a first chamber and a second chamber, wherein a first side of the plate section at least partially delimits the first chamber and a second side of the plate section opposite the first side at least partially delimits the second chamber. The first inverter and the second inverter each comprise at least one power module, wherein the power module of the first inverter is arranged on the first side of the plate section and the power module of the second inverter is arranged on the second side of the plate section.

[0008] In practice, however, it has been shown that, particularly when the housing of the electrical circuit assembly connects the two electric machines, torsional loads from the separated electric machines act upon this housing element. In addition, there are local, directional, external contact loads caused by the installation position, which can occur, for example, in collisions or crashes of the vehicle. Therefore, it has been proposed to equip the housing of the electrical circuit assembly with stiffening and / or reinforcing structures that protect the electrical and electronic components, especially the inverters, at least one capacitor bank, and the filter circuit, from external mechanical impacts. These stiffening structures, however, require additional installation space.Beyond a defined level of mechanical load, the combination of external and internal space limitations leaves no room for additional stiffening geometries in the main housing of the electrical circuit. Nevertheless, a corrective measure is required.

[0009] The invention is therefore based on the objective of providing an improved electrical circuit arrangement with regard to the absorption of external loads in the presence of limited available installation space.

[0010] To solve this problem, in an electrical circuit arrangement of the type mentioned above, it is provided according to the invention that the housing has a receiving structure and a housing wall element P241348 inserted into the receiving structure.

[0011] - 3 - which includes a circuit carrier comprising or forming an element-side stiffening structure, which carries the filter circuit.

[0012] It is therefore proposed to combine at least part of the stiffening structure and the filter circuitry in a housing wall element that forms a common section of the housing wall. This would allow for efficient use of installation space and provide targeted protection for the filter circuitry. In other words, part of the mechanical support structure of the electrical circuitry is integrated into a highly integrated electronic functional component, namely the housing wall element, to enhance its load-bearing capacity. Furthermore, its implementation is designed to allow for optimal use of the (main) housing space for the purpose of stiffness optimization.

[0013] Advantageously, the circuit carrier can be made of metal, particularly aluminum, and / or be solid and / or formed in one piece. An aluminum design is especially advantageous when heat dissipation, for example from the filter circuit, is required through the circuit carrier. Furthermore, aluminum has a low density, allowing the circuit carrier to be lightweight while simultaneously providing rigidity due to its particularly solid and / or one-piece construction.

[0014] The housing is preferably designed for the structural connection of the electrical machines. For example, one of the electrical machines assigned to the respective wheel of the corresponding axle can be arranged on each side of the housing, with the housing and the electrical machines being mechanically fastened to one another. In this way, a short electrical connection between the respective inverters or their power modules and the associated electrical machines is also possible.

[0015] However, due to the mechanical connection with the electrical machines, torsional loads act on the housing of the electrical circuit assembly. Another source of loads is externally triggered mechanical shocks, such as those occurring at certain points of application or in certain planes on the P241348.

[0016] - 4 - The housing of the electrical circuit assembly may be affected. It is therefore further proposed that the housing wall element be arranged in a favorable plane to absorb both torsional loads and point-like external forces.

[0017] In this regard, a particularly advantageous embodiment of the present invention provides that the housing wall element extends in a load plane in which, in the installed state of the electrical circuit arrangement in the motor vehicle, a local, directed load force is applied in the event of a collision of the motor vehicle, and / or is arranged at a distance from a center of rotation of a torsional load due to at least one of the electrical motors in the installed state. The torsional load typically acts at the mounting point of a respective electrical motor. These mounting points can, for example, be located opposite each other on the sides of the housing, for instance by means of a circumferential flange. The center of rotation of the torsional load can be located in a central region of the side wall.The housing wall element is therefore preferably arranged in a suitable mounting structure within one of the housing walls perpendicular to these side walls. The plane in which the housing wall element extends preferably coincides with a load plane in which an external force acts during a collision of the vehicle, for example, a rear-end collision. This makes it possible to absorb both point load forces in the load plane and the load of torsional stress.

[0018] Compared to a simple housing stiffener, the design according to the invention has the advantage of combining the housing wall element and the filter circuit, thus achieving a high level of integration and excellent utilization of the installation space. In other words, the EMC filter housing can also be described as a stiffening structure and implemented as part of the housing of the electrical circuit arrangement.

[0019] With particular advantage, the housing can have at least one additional, housing-side stiffening structure besides the element-side stiffening structure. Preferably, the element-side stiffening structure and the additional P241348

[0020] - 5 - Stiffening structure to absorb the load force and torsional stress together. For this purpose, their relative arrangement can be adapted to optimize the load-bearing capacity. In other words, the components of the electrical circuit arrangement, especially the housing, and their stiffening structures can be matched to each other for maximum effect.

[0021] Specifically, it can be provided, for example, that at least one of the at least one further stiffening structure is arranged in a plane perpendicular to the extension of the housing wall element, in particular in a housing wall perpendicular to the housing wall with the mounting structure, and especially intersecting the stiffening plane. If, for example, the electrical machines can be mounted on side walls of the housing, the mounting structure and the housing wall element can be provided in an upper housing wall (when installed in the vehicle) that lies in the load plane. At least one further stiffening structure can then be provided in a front and / or rear housing wall (when installed in the vehicle), preferably in its upper end region, and thus also at least partially lying in the load plane.In particular, and more generally speaking, at least one further stiffening structure can be provided at the point of application of the local, directed load force. This additional stiffening structure can be designed to distribute the acting load, especially across its width in the load plane. The distributed load can then be further absorbed by the housing wall element and its element-side stiffening structure.

[0022] In a preferred embodiment of the invention, the circuit carrier can comprise a base plate that supports the filter circuit and forms at least part of the element-side stiffening structure, and support walls extending perpendicularly from the base plate to at least two sides of the filter circuit, which define a circuit space containing the filter circuit. This means that the filter circuit is surrounded on at least five sides by the base plate and the support walls, and an upper cover can also be provided as part of the circuit carrier. However, a separate cover is also conceivable. The mechanical P241348

[0023] - 6 - The stiffening function is located in the circuit carrier, while the internal structure does not have this feature.

[0024] It is particularly preferred if the filter circuit is encapsulated within the circuit compartment using a potting compound. The potting compound is a sealant that can provide both electrical insulation and mechanical and / or thermal bonding to the circuit carrier. Specifically, it is particularly advantageous for the potting compound to be designed for thermal bonding of the filter circuit to the support walls of the circuit carrier, which is preferably made of aluminum, and / or for damping mechanical forces on the filter circuit, and / or to be a polymer resin. The potting compound, especially the polymer resin, reduces the forces transmitted to the sensitive electronics of the filter circuit, while simultaneously ensuring good thermal bonding of these electronics to the circuit carrier, which is preferably made of aluminum, and thus to the housing.

[0025] The solid base plate, whose shape can optionally at least partially follow the form of the filter circuit, preferably already forms a substantial part of the element-side stiffening structure. The base plate and the support walls preferably form the one-piece, for example cast, circuit carrier. The base plate can preferably also have at least one outer element-side flange by means of which the circuit carrier can be attached, for example to a corresponding mounting-structure-side flange, preferably by means of a screw connection. The element-side flange can be thicker than the rest of the base plate to promote stable attachment and load transfer. Preferably, the material thickness of the base plate and the support walls can be 2 to 6 mm, for example 3 to 4 mm, at least outside the flange.

[0026] In a specific further development, it may be provided that the support walls, as part of the element-side stiffening structure, in particular continuing into the base plate and / or sitting on it, have at least one stiffening shaped section and / or at least one stiffening thickening and / or at least one stiffening projection. In other words, the filter housing is reinforced around the P241348

[0027] - 7 - The filter circuit, which is partially formed by the support walls, is shaped with optimized stiffness. For example, at least one of the at least one shaped section and / or at least one of the at least one thickening and / or at least one of the at least one projection can form a lateral strut. It should be noted that shaped sections can also serve, at least partially, to provide spacing and thus improved electrical insulation of components of the filter circuit from the circuit support.

[0028] The filter circuit itself can be connected to the DC sides of the first and second inverters. It can also be connected to at least one capacitor bank, which can form an intermediate circuit capacitor. It can comprise one or more filter elements, which filter, in particular, the AC components at the switching frequencies of the inverters and / or their harmonics. Components of the filter circuit, or filter elements, can include, for example, X-capacitors, Y-capacitors, and / or at least one EMC core, for example, made of ferrite. Advantageously, separate capacitor banks can be provided for each inverter.

[0029] Furthermore, the housing wall element may include at least one busbar element electrically connected to the filter circuit for connecting the filter circuit, in particular to at least one capacitor arrangement of the electrical circuit arrangement and / or the DC sides of the inverters. In this way, the filter circuit can be electrically connected to other components of the electrical circuit arrangement, in particular to at least one capacitor arrangement in an intermediate circuit and / or to the DC sides of the inverters.In this context, further electrical connection elements, for example distribution busbars for connection to respective capacitor arrangements, can preferably extend within the housing below the housing wall element, in particular such that the electrical connection to the further electrical connection elements, especially distribution busbars, is established when the housing wall element is inserted into the receiving structure. The busbar elements can preferably also provide connections to the high-voltage network of the motor vehicle P241348.

[0030] - 8 -provide, in particular opposite terminals for internal connection in the electrical circuit arrangement.

[0031] Particularly in this context, but also more generally, it is advantageous if the mounting structure has a housing opening, at least partially closed by the housing wall element, for inserting at least one electrical connection element, in particular a busbar for connecting the filter circuit to the at least one capacitor arrangement and / or the inverters. The mounting structure has, for example, a rim, in particular with at least one flange on the mounting structure side, for attaching the housing wall element, which surrounds a housing opening that provides access to the interior of the housing, allowing the insertion of electrical connections as well as other measures, such as maintenance.For example, such electrical connections could be a distribution busbar that distributes the DC current paths to both sides of the inverter, particularly to the respective capacitor banks. During assembly of the electrical circuit arrangement, the distribution busbar can, for instance, be inserted through the housing opening before the housing wall element with the filter circuit is inserted into the mounting structure and secured, particularly with screws. This also simplifies the assembly process.

[0032] Particularly in connection with electrical connections, such as DC connections of the filter circuit and / or distribution busbars to the capacitor arrays and / or inverters, the space-efficient design of the electrical circuit arrangement can result in the housing opening not being completely covered by the circuit carrier. On the one hand, it may be possible (as is generally the case) to provide a housing cover that is placed over the housing wall element (and the housing opening). On the other hand, however, situations are conceivable in which a portion of the housing opening not covered by the circuit carrier and thus not by the element-side stiffening structure lies in an area where loads would be transferred to the circuit carrier. For example, this could be the side of the P241348

[0033] - 9 - Act as a receiving structure which is directed towards the point of application of the directed, local load force.

[0034] In such a case, i.e., if a first portion of the housing opening, which comprises a load-bearing side of the receiving structure where a load to be transferred to the element-side stiffening structure acts, is not covered by the circuit carrier, the receiving structure can preferably include a load-guiding and / or distribution structure to guide the load to be transferred to a second portion of the receiving structure, in which the circuit carrier is connected to the receiving structure in a load-transmitting manner. The load-guiding and / or distribution structure can, for example, be designed such that it forms an arc structure, at least in the region of the first portion, the orientation of which is directed towards the acting loads, in particular with regard to the local, directional load force.The arched structure is preferably symmetrical in the sense that its center point is located closest to the point of load application and / or that the load is distributed at least substantially equally between both arched arms. In a concrete embodiment, for example, the load-guiding elements of the load-guiding and / or distribution structure can be configured to form an arched shape at the point of application of the local, directed force and / or have an at least partially angled profile.In particular, a load-guiding element, shortened relative to the corresponding side length of the receiving structure and oriented perpendicular to the direction of the load force, can be provided towards the point of application. Symmetrically outwardly angled load-guiding elements extend from this element to the lateral portions of the receiving structure running in the direction of the load force, especially the flanges on the receiving structure side, so that the entire width of the opposite portion of the receiving structure, running perpendicular to the direction of the load force and facing away from the point of application, is covered. In addition to this configuration with angled load-guiding elements, a curved, arc-shaped profile on the side of the receiving structure facing the point of application is also conceivable, particularly an overall curved profile. P241348.

[0035] - 10 - Specifically, as already mentioned, it can be provided that the housing wall element is screwed to the receiving structure, in particular by means of an element-side flange, preferably provided on the base plate.

[0036] The general structure, in particular the arrangement of the inverters, especially their power modules, and / or the at least one capacitor arrangement, preferably two capacitor arrangements, inside the housing can also be designed to optimize installation space, as described in DE 102021 115272 A1 by way of example.For example, the housing may be provided with a plate section extending inside the housing, wherein the plate section divides the interior of the housing into a first chamber and a second chamber, wherein a first side of the plate section at least partially delimits the first chamber and a second side of the plate section opposite the first side at least partially delimits the second chamber, wherein the first inverter and the second inverter each comprise at least one power module, and the power module of the first inverter is arranged on the first side of the plate section and the power module of the second inverter is arranged on the second side of the plate section. Capacitor arrangements can then also be arranged in the respective first and second chambers.For distribution on the DC side, the electrical connection means, in particular the at least one distribution busbar, can then be used as described.

[0037] The electrical circuit arrangement can be used in a motor vehicle. Such a motor vehicle can, for example, have an electric drive arrangement comprising an electrical circuit arrangement according to the invention, a first electric machine connected to the AC side of the first inverter, and a second electric machine connected to the AC side of the second inverter. The electric drive arrangement can further comprise a first transmission unit and a second transmission unit coupled to the respective first and second electric machines. The transmission units can each be connected to a shaft, each of which can be connected to a different wheel of an axle of the motor vehicle, in particular a rear axle of the motor vehicle. The electrical P241348

[0038] - 11 - The circuit arrangement in the motor vehicle is installed such that the electric motors are electrically connected and fastened to the side walls of the housing, so that torsional loads can occur at the corresponding fastening points, which are related to a center of rotation on the side wall. Furthermore, in the event of a collision, in particular a rear-end collision, a local, directed force can be applied, for example, by a dented motor vehicle part, such as a trailer hitch, impacting the housing. The housing wall element with the element-side stiffening structure allows for sufficiently good absorption of such loads while protecting the electrical and electronic components and simultaneously providing a space-efficient design. All embodiments of the electrical circuit arrangement according to the invention can be transferred accordingly to such a motor vehicle and vice versa.

[0039] The invention is explained below with reference to exemplary embodiments and the drawings. The drawings are schematic representations and show:

[0040] Figure 1 schematically shows an electric drive arrangement for a motor vehicle,

[0041] Figure 2 shows a schematic diagram of the structure of an embodiment of an electrical circuit arrangement according to the invention.

[0042] Figure 3 shows a perspective view of a housing of the electrical circuit arrangement according to the invention to illustrate load effects,

[0043] Figure 4 shows a perspective view of a housing part of the housing,

[0044] Figure 5 shows the arrangement of electrical and electronic components of the electrical circuit arrangement within the housing.

[0045] Figure 6 shows a partial view of an upper part of the housing, P241348

[0046] - 12 - Figure 7 a perspective top view of a housing wall element,

[0047] Figure 8 shows a view of the housing wall element from below, and

[0048] Figure 9 shows a top view of the housing with the housing wall element inserted.

[0049] Figure 1 shows an embodiment of an electric drive arrangement 1 for a motor vehicle. The electric drive arrangement 1 comprises an electrical circuit arrangement 2 according to the invention, wherein the electrical circuit arrangement 2 includes a first inverter 3 and a second inverter 4, as well as a housing 5. The electric drive arrangement 1 further comprises a first electric machine 6, which is connected to the AC side of the first inverter 3, and a second electric machine 7, which is connected to the AC side of the second inverter 4.

[0050] Furthermore, the electric drive arrangement 1 comprises a first gear unit 8 and a second gear unit 9, wherein the first gear unit 8 is coupled to the first electric machine 6 and the second gear unit 9 is coupled to the second electric machine 7. The gear units 8, 9 can each be designed, for example, as a two-start planetary gear set. A shaft 10, 11 is connected to each gear unit 8, 9, which, when the electric drive arrangement 1 is used in a motor vehicle, can each be connected to a different wheel of an axle, in particular the rear axle, of the motor vehicle. The electric machines 6, 7 are load-bearing mounted to the housing 5 of the electric circuit arrangement 2, so that the entire electric drive arrangement 1 can be arranged and mounted in a motor vehicle with the aid of the housing 5 of the circuit arrangement 2.

[0051] Figure 2 shows a schematic diagram of the essential components of the electrical circuit arrangement 2 and their arrangement. The inverters 3 and 4 are clearly arranged facing a side wall 12 of the housing 5, for example, in different chambers separated by a plate section (not shown) of the housing 5. Each inverter 3 and 4 is associated with a capacitor arrangement 13 and 14, respectively.

[0052] - 13 - provides at least one intermediate circuit capacitor for each inverter 3, 4. A common filter circuit 15 is provided for both inverter arrangements thus formed, which is provided as part of a housing wall element 16 that is received in a corresponding receiving structure of an upper housing wall 17. In addition to the filter circuit 15, the housing wall element 16 comprises a circuit carrier 18 with at least one element-side stiffening structure 19. The housing wall element 16 extends in a load plane in which, in the installed state of the electrical circuit arrangement 2 in the motor vehicle, a local, directed load force is applied in the event of a collision of the motor vehicle. It is also arranged at a distance from a center of rotation of a torsional load due to at least one of the electric machines 6, 7 in the installed state. This will be explained in more detail below with reference to Figure 3.

[0053] This shows a simplified perspective view of the exterior of the housing 5 to illustrate the acting loads. The electrical machines 6, 7 are attached to the respective side walls 12, for example by means of flanges (not shown in detail here), such that their center of rotation lies in an area 20, which also forms the center of rotation of a torsional load, indicated by arrows 21. Also shown is the point of application 22 of a local, directed load force, which occurs, for example, in a collision of the vehicle due to the installation of the electrical circuit arrangement 2, indicated by arrow 23. In this case, the point of application 22 is located in the upper area of ​​a rear housing wall 24 of the housing 5, after the load force occurs in a rear-end collision of the vehicle.

[0054] The upper housing wall 17 is positioned such that it lies within the load plane where the load force is applied. This load plane is also located away from the center of rotation of the torsional load, allowing it to be absorbed there as well. A receiving structure, not shown in detail here, is provided in the upper housing wall 17, into which the housing wall element 16 is received, enabling the stiffening structure 19 to absorb the torsional load and the load force, thus reinforcing the housing. In particular, the circuit carrier 18 is located within the load plane.

[0055] - 14 -

[0056] Figure 4 shows a housing part 27 of the housing 5, which provides the upper housing wall 17, the rear housing wall 24, the lower housing wall 25, and the front housing wall 26. A receiving structure 28, which in this case surrounds a housing opening 29, is visible in the upper housing wall 17, into which the housing wall element 16 can be inserted. The receiving structure 28 includes flanges 30 on the receiving structure side, to which the housing wall element 16 can be securely screwed. A first portion 31 of the housing opening 29, which comprises a load-bearing side of the receiving structure 28 where a load to be transferred to the element-side stiffening structure 19 acts, is not covered by the circuit carrier 18, since, as will be shown in the other figures, electrical connecting elements are to be arranged there.Therefore, the receiving structure includes a load-guiding and / or distribution structure 32 to guide the load to be transferred to a second part of the receiving structure 28 with the flanges 30, where the circuit carrier 18 is connected to the receiving structure 28 in a load-transmitting manner.

[0057] The load-guiding and / or distribution structure 32 is evidently arc-shaped and faces the point of application 22. In this case, a load-guiding element 33, perpendicular to the direction of the load force (arrow 23 in Figure 3), is provided towards the point of application 22. Symmetrically outwardly angled load-guiding elements 34 extend from this element to the lateral portions 35 of the receiving structure, which run in the direction of the load force and where the flanges 30 on the receiving structure side are located. A corresponding guiding effect is also provided for torsional loads. In this way, the acting load is guided to the stiffening structure 19.

[0058] Figure 4 also shows that a further stiffening structure 36 is provided on the rear housing wall 24. This structure receives the directed, local load force and distributes it laterally, where it can be transferred to the element-side stiffening structure 19 by means of the load-guiding and / or distribution structure 32. The stiffening structures 19 and 36 are coordinated for optimized performance.

[0059] - 15 -

[0060] Figure 5 shows – without the housing 5 – a more detailed arrangement of various components of the electrical circuit arrangement 2 as they are contained within the housing 5. A power module 37 is provided for both the first inverter 3 and the second inverter 4, which can be arranged, for example, on the aforementioned plate section of the housing 5. Capacitor arrangements 13 and 14 are provided for each of the two inverters 3 and 4 above the power modules 37, from which the AC connections 38 to the electrical machines 6 and 7 also extend. The capacitor arrangements 13 and 14 comprise several capacitors and thus also several connections 38. The connection of the filter circuit 15 to these connections 38, and thus the distribution to the two inverters 3 and 4, is effected by connecting elements, in this case distribution busbars 39, which are only partially visible here.The electrical connecting elements are connected to busbar elements 40, and thus to connections to the filter circuit 15. This electrical connection is the reason for the first part 31 of the housing opening 29, which is not covered by the circuit carrier 18.

[0061] On the other side of the filter circuit 15, a connection area 41 to the high-voltage network of the motor vehicle is provided.

[0062] Figure 6 shows, for further clarification, a view of the upper part of the housing 5, in which the housing wall element 16 has not yet been inserted into the housing opening 29. The distribution busbars 39 leading to the terminals 38 are visible through the housing opening 29. These were indeed inserted through the housing opening 29, which is then closed by the housing wall element 16. After the housing wall element 16 is detachably fastened to the flanges 30 by means of screws, the housing opening 29 can still be used for maintenance at later times.

[0063] Figures 7 and 8 now show the housing wall element 16 in more detail. The filter circuit 15 is supported by the circuit carrier 18, which in this case is made entirely of aluminum and is a single, solid piece. The circuit carrier 18 has P241348

[0064] - 16 -as part of the stiffening structure 19, a base plate 42 is provided, on which thickened element-side flanges 43 are also provided, which rest on the receiving structure-side flanges 30 for fastening. The solid base plate 42 can be adapted in its shape to the filter circuit 15, at least partially, as shown. Support walls 44 extend from the base plate 42 on the side of the filter circuit 15, on which side struts 45 of the element-side stiffening structure 19 are formed by stiffening shaped sections, stiffening thickenings and stiffening projections.

[0065] The support walls 44 and the base plate 42 define a circuit compartment for the filter circuit 15, of which only EMC cores 46, for example ferrite cores, are visible in this example, since these and the remaining components of the filter circuit 15 are encapsulated with a plastic resin 47 as a potting material. The plastic resin 47 serves, firstly, as a mechanical and thermal connection between the filter circuit 15 and the circuit carrier 18, and secondly, it reduces the forces transmitted to the sensitive electronics. It is also, of course, electrically insulating.

[0066] Figure 9 shows the top surface 17 of the housing 5, with the housing wall element 16 inserted into the receiving structure 28. A housing cover (not shown) can be placed over the housing wall element 16. P241348

[0067] - 17 - List of reference symbols

[0068] 1 electric drive arrangement

[0069] 2 electrical circuit arrangement

[0070] 3 Inverter

[0071] 4 Inverter

[0072] 5 cases

[0073] 6 electric machine

[0074] 7 electric machine

[0075] 8 Gear unit

[0076] 9 Gear unit

[0077] 10 wave

[0078] 11th wave

[0079] 12 side wall

[0080] 13 Capacitor arrangement

[0081] 14 Capacitor arrangement

[0082] 15 Filter circuit

[0083] 16 Housing wall element

[0084] 17 Top

[0085] 18 circuit carriers

[0086] 19 Stiffening structure

[0087] Area 20

[0088] 21 arrows

[0089] 22 attack point

[0090] 23 Arrow

[0091] 24 rear case wall

[0092] 25 lower case wall

[0093] 26 front case wall

[0094] 27 Housing part

[0095] 28 Recording structure

[0096] 29 Case opening

[0097] 30 Flange P241348

[0098] - 18 - 31 share

[0099] 32 Load conduction and / or distribution structure 33 Load guidance element

[0100] 34 Load guiding element

[0101] 35 share

[0102] 36 Stiffening structure

[0103] 37 Power module

[0104] 38 connections

[0105] 39 electrical connector

[0106] 40 busbar elements

[0107] 41 Connection area

[0108] 42 Base plate

[0109] 43 Flange

[0110] 44 load-bearing wall

[0111] 45 Side brace

[0112] 46 EMC core

[0113] 47 Plastic resin

Claims

P241348 - 19 - Patent claims 1. Electrical circuit arrangement (2) for two electric machines (6, 7) of a motor vehicle, comprising a first inverter (3), a second inverter (4), a housing (5) accommodating the inverters (3, 4) and a filter circuit (15), characterized in that the housing (5) has a receiving structure (28) and a housing wall element (16) inserted into the receiving structure (28), which comprises a circuit carrier (18) comprising or forming an element-side stiffening structure (19) and which supports the filter circuit (15).

2. Electrical circuit arrangement according to claim 1, characterized in that the housing wall element (16) extends in a load plane in which, in the installed state of the electrical circuit arrangement (2) in the motor vehicle, a local, directed load force is applied in the event of a collision of the motor vehicle, and / or is arranged at a distance from a center of rotation of a torsional load due to at least one of the electrical machines (6, 7) in the installed state.

3. Electrical circuit arrangement according to claim 1 or 2, characterized in that the housing (5) has at least one further stiffening structure (36) in addition to the element-side stiffening structure (19).

4. Electrical circuit arrangement according to one of the preceding claims, characterized in that the circuit carrier (18) comprises a base plate (42) which supports the filter circuit (15) and forms at least a part of the element-side stiffening structure (19), and comprises support walls (44) extending perpendicularly from this to the side of the filter circuit (15), which define a circuit space containing the filter circuit (15).

5. Electrical circuit arrangement according to claim 4, characterized in that the filter circuit (15) is potted in the circuit space using a potting material. P241348 - 20 - 6. Electrical circuit arrangement according to claim 5, characterized in that the potting material is designed for thermal connection of the filter circuit (15) to the support walls (44) of the circuit carrier (18), which is made in particular of aluminium, and / or for damping mechanical action on the filter circuit (15), and / or is a plastic resin (47).

7. Electrical circuit arrangement according to one of claims 4 to 6, characterized in that the support walls (44) as part of the element-side stiffening structure (19), in particular continued into the base plate (42) and / or sitting on it, have at least one stiffening shaped section and / or at least one stiffening thickening and / or at least one stiffening projection.

8. Electrical circuit arrangement according to one of the preceding claims, characterized in that the housing wall element (16) has at least one busbar element (40) electrically connected to the filter circuit (15) for connecting the filter circuit (15), in particular to at least one capacitor arrangement (13, 14) of the electrical circuit arrangement (2).

9. Electrical circuit arrangement according to one of the preceding claims, characterized in that the receiving structure (28) has a housing opening (29) closed by the housing wall element (16) for inserting at least one electrical connecting element, in particular a busbar (39) for connecting the filter circuit (15) to the at least one capacitor arrangement (13, 14) and / or the inverters (3, 4).

10. Electrical circuit arrangement according to one of the preceding claims, characterized in that a first part (31) of the housing opening (29), which comprises a load-bearing side of the receiving structure (28) on which a load to be transferred to the element-side stiffening structure (19) acts, is not covered by the circuit carrier (18) and the receiving structure (28) comprises a load-guiding and / or distribution structure (32) in order to guide the load to be transferred to a second part (35) of the receiving structure (28) in which the circuit carrier (18) is connected to the receiving structure (28) in a load-transmitting manner.

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