Filtering device

Abstract

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

Description

Technical Field

[0001] The invention relates to a filter device of an electronic device and an electronic device. Background Art

[0002] Electronic devices for power semiconductors in power electronics are known. In this case, capacitors are often used as filters, for example for filtering electromagnetic interference signals. Such capacitors are usually provided as separate components, which need to be connected to electrically conductive components such as plates. The known electronic devices often have a large number of components and need to be manufactured in a time-consuming and costly manner. Summary of the invention

[0003] The filter device according to the invention with the features of claim 1 offers the advantage of a particularly simple and cost-effective structure, which allows particularly simple production. In addition, a mechanically strong structure and a reliable electrical connection can be achieved. This is achieved according to the invention by a filter device for an electronic device, which comprises 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-locked and electrically conductive joint. That is to say, no further components, such as, for example, additional welding pieces, etc., are arranged between the capacitor and each busbar.

[0004] In particular, components which are designed to transmit current in the filter device can be considered as busbars. For example, a separate potential can be set for each busbar. In particular, each busbar is made of an electrically conductive material.

[0005] The filter device thus offers the advantage of a structure having only a small number of components. In particular, only a single joint is required between the capacitor and each of the two busbars. As a result, on the one hand, material and weight can be saved, for example, by eliminating additional welding sheets, and on the other hand, assembly can be simplified by saving processing steps. As a result, the filter device can be provided particularly cost-effectively. In addition, the filter device provides a particularly sturdy structure through the direct connection of the capacitor to the two busbars, which structure, for example, can achieve a long service life of the filter device. In addition, the direct connection can provide an optimal current transmission between the capacitor and the busbar, because, for example, the unique connection of each busbar can be established in a simple manner with high quality, so as to reliably provide a high-quality joint with optimal electrical properties.

[0006] Preferred developments of the invention are the subject matter of the dependent claims.

[0007] Preferably, the joint between the capacitor and each of the two busbars is a welded joint. This allows a particularly strong joint to be produced with simple and cost-effective producibility. Furthermore, an optimal electrical conductivity of the joint can be ensured.

[0008] It is particularly preferred that the joint is a laser welded joint, so that the joint can be produced particularly precisely and in a time-saving manner, so that the filter device can be produced at low cost with high quality of the joint.

[0009] Preferably, each of the two busbars is designed at least partially, preferably in the region of the joint, as a sheet. That is, the width and / or length of each busbar is many times greater than the respective thickness. For example, it is thereby possible to use the busbar to transmit particularly high currents with simple and cost-effective producibility of the busbar. In addition, simple and flexible production is possible, for example with different complex geometries, in particular due to the easy convertibility of the sheet-shaped busbar.

[0010] Preferably, each of the busbars is made of copper or a copper alloy, thereby providing particularly good current transmission and advantageous weldability.

[0011] Furthermore, it is preferred that the capacitor has a connecting line for each busbar, which is connected to the corresponding busbar. In particular, the linearly protruding and electrically conductive areas of the capacitor are regarded as connecting lines, which are welded to the busbar, in particular by means of a laser welding joint. This allows a simple and cost-effective design of the filter device to be provided with particularly simple assembly.

[0012] Preferably, each connecting wire is arranged substantially orthogonal to the plate plane of the corresponding busbar in the region of the joint. In other words, each connecting wire extends along the thickness direction of the corresponding busbar inside the region where the joint is arranged. Thus, an advantageous space-saving arrangement and simple assembly of the components of the filter device can be achieved.

[0013] It is particularly preferred that each connecting wire contacts the side edge of the corresponding busbar. In particular, the end side of the corresponding busbar is regarded as a side edge. In other words, each connecting wire can be placed on each busbar at the side and welded in this position. This allows for optimal accessibility of the connection points for assembly, thereby allowing for particularly simple and cost-effective production of the filter device.

[0014] It is also preferred that each of the two busbars has a fork-shaped connection region, which at least partially surrounds the corresponding connecting wire. In particular, the following connection region is considered to be fork-shaped, which has at least two protruding elements, between which the connecting wire can be arranged. In particular, each connection region has two V-shaped or U-shaped protruding regions, between which the corresponding connecting wire is inserted. This can provide a particularly advantageous arrangement and connectability of the connecting wire. In addition, a large contact surface between the connecting wire and the busbar can be achieved, thereby ensuring an optimal electrical connection.

[0015] Preferably, the filter device is designed to filter electromagnetic interference. In particular, the busbars and capacitors are designed accordingly to be able to attenuate electromagnetic interference, for example in the region of the power electronics component.

[0016] The invention further relates to an electronic device comprising a power electronic component and the described filter device. In particular, the power electronic component and the filter device are arranged spatially close to each other, preferably integrated into a common component, so that the filter device is designed to eliminate electromagnetic interference with the electronic device. In this way, in particular, optimal operation of the power electronic component can be achieved.

[0017] The power electronic component is preferably an inverter, such as a high-voltage drive converter, a high-voltage DC-DC converter, a cooling fan or other components of an industrial drive or the like. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention is described below with reference to an embodiment in conjunction with the accompanying drawings. In the accompanying drawings, components with the same function are marked with the same reference numerals. Here:

[0019] Figure 1 A perspective view showing an electronic device according to a preferred embodiment of the present invention;

[0020] Figure 2 Shows Figure 1 a perspective detail view of an electronic device;

[0021] Figure 3 Shows Figure 1 Another detailed view of the electronic device; and

[0022] Figure 4 Shows Figure 1 Another detail view of the electronic device. DETAILED DESCRIPTION

[0023] Figure 1A perspective view of an electronic device 50 according to a preferred exemplary embodiment of the present invention is shown. The electronic device 50 comprises a power electronic component 60 which is designed in particular as an inverter.

[0024] The electronic system 50 further comprises a filter device 40 which is designed to filter electromagnetic interference in the electronic system 50 , in particular in the region of the power electronic component 60 .

[0025] The power electronic component 60 and the filter device 40 are preferably mounted on a common printed circuit board 70 .

[0026] The filter device 40 comprises a first busbar 1 and a second busbar 2. Different potentials are applied to the two busbars 1, 2, respectively.

[0027] A capacitor 3 is connected to each of the two busbars 1 , 2 , which capacitor is part of a filter device 40 .

[0028] When the capacitor 3 is connected to the busbars 1 and 2, Figures 2 to 4 Shown in.

[0029] The capacitor 3 is preferably a film capacitor or, as an alternative, an electrolytic capacitor.

[0030] The capacitor 3 is connected here directly by means of a cohesive and electrically conductive joint to each of the two busbars 1 , 2 . The joint 4 is a laser welded joint here.

[0031] Preferably, as in Figure 2 and 3 As can be seen in FIG. 4 , the capacitor 3 is integrated into the holding region 8 in the assembled state of the filter device 40. The holding region 8 can be, for example, a plastic or the like into which the capacitor 3 is cast, for example, in order to clamp the capacitor 3 mechanically in a stable manner.

[0032] The two busbars 1, 2 are each designed as a sheet metal and consist in particular of copper or a copper alloy. This allows a high degree of flexibility in the geometry of the busbars 1, 2 with simple and cost-effective producibility, since the busbars can be reshaped in a simple manner, for example. For example, the two busbars 1, 2 can have separate areas on different levels in order to achieve an optimal space-saving arrangement.

[0033] Each busbar 1 , 2 has a predetermined thickness 18 , 28 , which is preferably constant over the entire busbar 1 , 2 in each case, for example the predetermined thickness 18 , 28 is at least a few millimeters, particularly preferably 4 mm.

[0034] The capacitor 3 also has two connecting lines 30 , by means of which the cohesive and electrically conductive connection to the two busbars 1 , 2 is formed. That is, a laser welded joint is formed between each connecting line 30 and the respective busbar 1 , 2 .

[0035] Each busbar 1 , 2 has a connection region 17 , 27 at which a corresponding laser-welded joint is formed with a corresponding connecting line 30 of the capacitor 3 .

[0036] At the joint 4 , the respective connecting line 30 is arranged orthogonally to the plate plane 10 , 20 of the respective busbar 1 , 2 .

[0037] The connection area 17, 27 of each busbar 1, 2 is as shown in particular in Figure 3 It is formed in a forked shape, as can be seen in Figure 3 A plan view of a detail of the filter device 40 is shown, wherein the illustrated plane is parallel to the plate planes 10 , 20 .

[0038] As in Figure 3 As can be seen in the figure, each fork-shaped connecting area 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 the side edge 15, 25 of the corresponding busbar 1, 2. In particular, the side faces of the plate-shaped busbars 1, 2, which are arranged orthogonally to the corresponding plate plane 10, 20, are considered to be side edges. As a result, each connecting wire 30 is at least partially surrounded by the corresponding fork-shaped connecting area 17, 27 of the corresponding busbar 1, 2.

[0039] On the one hand, this makes it possible to provide a precisely positioned arrangement of the connecting conductor 30 in a particularly simple manner. On the other hand, this makes it possible to achieve a high contact surface between the busbars 1, 2 and the connecting conductor 30, since the busbars 1, 2 and the connecting conductor 30 are in contact around a relatively large partial area of ​​the circumferential surface of the connecting conductor 30. Furthermore, by means of the contact surface thus enlarged, a relatively large-area laser welded joint can be provided, which can provide an optimal electrical connection in addition to a particularly stable mechanical connection.

Claims

1. A filter device for an electronic device (50), comprising: - a first busbar (1); - a second busbar (2); as well as - a capacitor (3); The capacitor (3) is directly connected to each of the two busbars (1, 2) by means of a cohesive and electrically conductive joint (4).

2. The filter device according to claim 1, wherein the joint (4) is a solder joint.

3. The filter device according to claim 2, wherein the joint (4) is a laser welding joint. 4 . The filter device according to claim 1 , wherein each busbar ( 1 , 2 ) is designed as a plate at least in the region of the joint ( 4 ).

5. The filter device according to claim 4, wherein the capacitor (3) has a connecting line (30) for each busbar (1, 2), and the connecting line is connected to the corresponding busbar (1, 2).

6. The filter device as claimed in claim 5, wherein each connecting line (30) extends in the region of the joint (4) substantially orthogonally to the sheet metal plane (10, 20) of the respective busbar (1, 2).

7. The filter device according to claim 5 or 6, wherein each connecting conductor (30) is in contact with a side edge (15, 25) of a corresponding busbar (1, 2).

8. The filter device according to claim 5, wherein each busbar (1, 2) has a fork-shaped connection region (17, 27) which at least partially surrounds the respective connecting line (30).

9. The filter device according to any of the preceding claims, wherein the filter device (40) is designed to filter electromagnetic interference.

10. Electronic devices, including: - a power electronic component (60), and - Filter device (40) according to any of the preceding claims.

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

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