Filter assembly

Abstract

The invention relates to a filter assembly (40) of an electronic assembly (50), comprising a first busbar (1), a second busbar (2), and a capacitor (3), wherein the capacitor (3) is directly connected to each of the two busbars (1, 2) by means of a bonded and electrically conductive connection (4).

Description

[0001] Description

[0002] title

[0003] Filter arrangement

[0004] State of the art

[0005] The present invention relates to a filter arrangement of an electronic arrangement, and an electronic arrangement.

[0006] Electronic arrangements for power semiconductors in power electronics are well known. Capacitors are often used as filters, for example, to filter electromagnetic interference. Such capacitors are usually provided as separate components that must be connected to current-carrying components, such as metal sheets. Such electronic arrangements often have a large number of components and are time-consuming and costly to manufacture.

[0007] Disclosure of the invention

[0008] The filter arrangement according to the invention with the features of claim 1 offers the advantage of a particularly simple and cost-effective construction, which allows for particularly easy production. In addition, a mechanically robust construction and a reliable electrical connection are enabled. This is achieved according to the invention by a filter arrangement of an electronic arrangement, comprising a first busbar, a second busbar, and a capacitor. The capacitor is connected directly to each of the two busbars by means of a material-to-material and electrically conductive connection. This means that no further components, such as additional welding plates or the like, are arranged between the capacitor and each busbar. A busbar can be considered, in particular, a component which is designed for current transmission in the filter arrangement.For example, a separate electrical potential can be provided for each busbar. In particular, each busbar is made of an electrically conductive material.

[0009] The filter assembly thus offers the advantage of a design with only a few components. In particular, only a single connection is required between the capacitor and each of the two busbars. This allows for material and weight savings, for example, by eliminating additional welding plates, and assembly can be simplified by eliminating processing steps. This allows the filter assembly to be provided particularly cost-effectively. Furthermore, the filter assembly offers a particularly robust construction due to the direct connection of the capacitor to the two busbars, which can, for example, enable a long service life for the filter assembly.In addition, the direct connection can provide optimal electrical current transmission between the capacitor and the busbar, since, for example, the only connection per busbar can be easily manufactured with high quality to reliably provide a high-quality connection with optimal electrical properties.

[0010] The subclaims contain preferred developments of the invention.

[0011] Preferably, the connection between the capacitor and each of the two busbars is a welded joint. This allows for a particularly robust connection while being simple and cost-effective to manufacture. Furthermore, optimal electrical conductivity of the connection can be ensured.

[0012] Particularly preferably, the connection is a laser weld. This allows the connection to be made particularly precisely and time-efficiently, enabling the filter assembly to be manufactured at a low cost while maintaining a high quality connection.

[0013] Preferably, each of the two busbars is formed at least partially, preferably in the connection area, as a sheet metal element. This means that the width and / or length of each busbar is many times greater than its respective thickness. For example, this allows particularly high currents to be transmitted while the busbars can be manufactured simply and cost-effectively. Furthermore, simple and flexible production, for example, with various complex geometries, is possible, particularly due to the easy formability of the sheet metal busbars.

[0014] Preferably, each of the busbars is made of copper or a copper alloy. This provides particularly good current transmission and advantageous weldability.

[0015] Further preferably, the capacitor has a connecting wire for each busbar, which is connected to the respective busbar. A connecting wire is considered to be, in particular, a wire-shaped, protruding and electrically conductive region of the capacitor, which is welded to the busbar, in particular by means of the laser welding connection. This allows for a simple and cost-effective design of the filter arrangement with particularly easy assembly.

[0016] Preferably, each connecting wire is arranged in the region of the connection substantially orthogonal to a sheet metal plane of the respective busbar. In other words, each connecting wire extends along a thickness direction of the respective busbar within the region in which the connection is arranged. This enables an advantageous, space-saving arrangement of the components of the filter arrangement as well as simple assembly.

[0017] Particularly preferably, each connecting wire touches a side edge of the respective busbar. A side edge is considered, in particular, to be an end face of the respective busbar. This means that each connecting wire can be placed laterally against each busbar and welded in this position. This allows optimal accessibility of the connection point for assembly, thus enabling particularly simple and cost-effective production of the filter assembly.

[0018] Further preferably, each of the two busbars has a fork-shaped connecting region that at least partially encompasses the respective connecting wire. A connecting region that has at least two protruding elements between which the connecting wire can be arranged is considered to be fork-shaped. In particular, each connecting region has two V-shaped or U-shaped protruding regions between which the respective connecting wire is inserted. This allows for a particularly advantageous arrangement and connectability of the connecting wires. In addition, a large contact area between the connecting wire and the busbar is enabled, thereby ensuring an optimal electrical connection.

[0019] Preferably, the filter arrangement is configured to filter electromagnetic interference. In particular, the busbars and the capacitor are designed to attenuate electromagnetic interference, for example, in the area of ​​power electronic components.

[0020] Furthermore, the invention relates to an electronic arrangement comprising a power electronic component and the described filter arrangement. In particular, the power electronic component and the filter arrangement are arranged spatially close to one another, preferably integrated into a common component, so that the filter arrangement is configured to provide electromagnetic interference suppression for the electronic arrangement. In particular, this enables optimal operation of the power electronic component.

[0021] Preferably, the power electronic component is an inverter, for example a high-voltage drive inverter, a high-voltage DC-DC converter, a cooling fan, or another part of an industrial drive or the like. Brief description of the drawings

[0022] The invention is described below using exemplary embodiments in conjunction with the figures. In the figures, functionally identical components are identified by the same reference numerals. Here:

[0023] Figure 1 is a perspective view of an electronic arrangement according to a preferred embodiment of the invention,

[0024] Figure 2 is a perspective detailed view of the electronic arrangement of Figure 1,

[0025] Figure 3 shows a further detailed view of the electronic arrangement of Figure 1, and

[0026] Figure 4 shows a further detailed view of the electronic arrangement of Figure 1.

[0027] Preferred embodiments of the invention

[0028] Figure 1 shows a perspective view of an electronic assembly 50 according to a preferred embodiment of the invention. The electronic assembly 50 comprises a power electronic component 60, which is designed in particular as an inverter.

[0029] The electronic arrangement 50 further comprises a filter arrangement 40, which is configured to filter electromagnetic interference in the electronic arrangement 50, in particular in the region of the power electronic component 60.

[0030] The power electronic component 60 and the filter arrangement 40 are preferably mounted on a common circuit board 70. The filter arrangement 40 comprises a first busbar 1 and a second busbar 2. A different electrical potential is applied to each of the two busbars 1, 2.

[0031] A capacitor 3, which is part of the filter arrangement 40, is connected to each of the two busbars 1, 2.

[0032] The capacitor 3 is shown in detail in Figures 2 to 4 in the state connected to the busbars 1, 2.

[0033] The capacitor 3 is preferably a film capacitor, or alternatively an electrolytic capacitor.

[0034] The capacitor 3 is directly connected to each of the two busbars 1, 2 by means of a material-to-material and electrically conductive connection 4. The connection 4 is a laser-welded joint.

[0035] Preferably, the capacitor 3, as can be seen in Figures 2 and 3, is integrated into a holding area 8 in the assembled state of the filter assembly 40. The holding area 8 can, for example, be a plastic or the like into which the capacitor 3 is cast, for example, for stable mechanical support of the capacitor 3.

[0036] The two busbars 1, 2 are each formed as a single sheet, and in particular made of copper or a copper alloy. This allows for a high degree of flexibility in the geometry of the busbars 1, 2 while allowing for simple and cost-effective manufacturing, as they can be easily formed, for example. For example, the two busbars 1, 2 can have separate areas on different levels to enable optimal space-saving arrangements.

[0037] Each busbar 1, 2 has a predetermined thickness 18, 28, which is preferably constant across the entire respective busbar 1, 2. For example, the predetermined thickness 18, 28 is at least several millimeters, particularly preferably 4 mm. The capacitor 3 further has two connecting wires 30, by means of which the integral and electrically conductive connection 4 to the two busbars 1, 2 is formed. This means that the laser-welded connection is formed between each connecting wire 30 and the respective busbar 1, 2.

[0038] Each busbar 1, 2 has a connecting region 17, 27 at which the respective laser welding connection with the respective connecting wire 30 of the capacitor 3 is formed.

[0039] At the connection 4, the respective connecting wire 30 is arranged orthogonally to a sheet plane 10, 20 of the respective busbar 1, 2.

[0040] The connecting regions 17, 27 of each busbar 1, 2 are fork-shaped, as can be seen in particular in Figure 3, which shows a plan view of a detail of the filter arrangement 40, wherein the drawing plane is parallel to the sheet planes 10, 20.

[0041] As can be seen in Figure 3, each fork-shaped connecting region 17, 27 has a V-shaped recess at its end, into which a connecting wire 30 is inserted. As a result, each connecting wire 30 is in contact with a side edge 15, 25 of the respective busbar 1, 2. In particular, a side surface of the sheet-metal busbar 1, 2 arranged orthogonally to the respective sheet plane 10, 20 is considered to be the side edge. Thus, each connecting wire 30 is at least partially encompassed by the corresponding fork-shaped connecting region 17, 27 of the respective busbar 1, 2.

[0042] This allows, on the one hand, a precisely positioned arrangement of the connecting wires 30 to be provided in a particularly simple manner. On the other hand, it enables a large contact area between the busbar 1, 2 and the connecting wire 30, since the busbar 1, 2 and the connecting wire 30 touch over a larger portion of a circumferential surface of the connecting wire 30. Furthermore, the thus enlarged contact area allows for a larger-area laser-welded connection, which, in addition to a particularly stable mechanical connection, also provides an optimal electrical connection.

Claims

Claims 1. A filter arrangement of an electronic arrangement (50), comprising: - a first busbar (1), - a second busbar (2), and - a capacitor (3), - wherein the capacitor (3) is directly connected to each of the two busbars (1, 2) by means of a material-to-material and electrically conductive connection (4).

2. Filter arrangement according to claim 1, wherein the connection (4) is a welded connection.

3. Filter arrangement according to claim 2, wherein the connection (4) is a laser welded connection.

4. Filter arrangement according to one of the preceding claims, wherein each busbar (1, 2) is formed as a sheet metal at least in the region of the connection (4).

5. Filter arrangement according to claim 4, wherein the capacitor (3) has a connecting wire (30) for each busbar (1, 2) which is connected to the respective busbar (1, 2).

6. Filter arrangement according to claim 5, wherein each connecting wire (30) in the region of the connection (4) extends substantially orthogonally to a sheet plane (10, 20) of the respective busbar (1, 2).

7. Filter arrangement according to claim 5 or 6, wherein each connecting wire (30) is in contact with a side edge (15, 25) of the respective busbar (1, 2).

8. Filter arrangement according to one of claims 5 to 7, wherein each busbar (1, 2) has a fork-shaped connecting region (17, 27) which at least partially surrounds the respective connecting wire (30).

9. Filter arrangement according to one of the preceding claims, wherein the Filter arrangement (40) is designed to filter electromagnetic interference.

10. Electronic assembly comprising: - a power electronic component (60), and - a filter arrangement (40) according to one of the preceding claims.

11. Electronic arrangement according to claim 10, wherein the power electronic component (60) is an inverter.

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