WOUND CAPACITOR, PULSE-CONTROLLED INVERTER AND MOTOR VEHICLE

Abstract

A wound capacitor is provided, the wound capacitor including a cooling channel for conducting coolant. The provided cooling channel includes an electrically non-conductive and thermally conductive material. A pulse-controlled inverter including the wound capacitor is provided. A motor vehicle including the pulse-controlled inverter and the wound capacitor are also provided.

Claims

1. A wound capacitor, comprising a cooling channel for conducting coolant, wherein the cooling channel comprising an electrically non-conductive and thermally conductive material.

2. The wound capacitor according to claim 1, wherein a material used to form the cooling channel is heat-resistant and thermally conductive.

3. The wound capacitor according to claim 1, wherein the coolant is a liquid and the coolant can dissipate heat.

4. The wound capacitor according to claim 1, wherein the cooling channel extends parallelto an axis of the wound capacitor.

5. The wound capacitor according to claim 4, wherein thecooling channel extends coaxially to the wound capacitor.

6. The wound capacitor accorting to claim 1, wherein the cooling channel has an inlet which extends radially to the wound capacitor.

7. The wound capacitor according to claim 1, wherein: the wound capacitor has metallic electrodes, and the wound capacitor has a dielectric between the electrodes.

8. The wound capacitor according to claim 7, wherein:the wound capacitor has front-side terminals, and the terminals are electrically connected to the electrodes.

9. A pulse-controlled inverter comprising a DC link, the DC link including the wound capacitor according to claim 1.

10. A motor vehicle, comprising an electric drive train, the drive train having the pulse-controlled inverter according to claim 9.

11. The wound capacitor according to claim 1, wherein a material used to form the cooling channel is chemically resistant to the coolant.

12. The wound capacitor according to claim 1, herein the cooling channel has an outlet extends radially to the wound capacitor

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Subject matter of the present disclosure will be described in even greater detail below based on the exemplary figures. All features described and/or illustrated herein can be used alone or combined in different combinations, The features and advantages of various embodiments will become apparent by reading the following detailed description with reference to the attached drawings, which illustrate the following:

[0012] FIG. 1 shows the perspective view of a wound capacitor according to the prior art;

[0013] FIG. 2 shows the structure of the wound capacitor in a schematic longitudinal section:

[0014] FIG. 3 shows a view of a first variant of an embodiment of the invention corresponding to the view of FIG. 1;

[0015] FIG. 4 shows a perspective view of a second variant of an embodiment of the invention;

[0016] FIG. 5 shows a perspective view of a third variant of an embodiment of the invention; and

[0017] FIG. 6 shows a perspective view of a fourth variant of an embodiment of the invention.

DETAILED DESCRIPTION

[0018] In an embodiment, the present invention provides a wound capacitor, a corresponding pulse-controlled inverter and a corresponding motor vehicle.

[0019] One advantage of embodiments of the present invention lies in the possibility of optimizing the flow control. In view of the given coolant conducting system, the pressure of the coolant is easily adjustable.

[0020] In an advantageous embodiment, a configuration of cooling channels using electrically non-conductive, thermally conductive material such as plastic, preferably fiber-reinforced, duromer plastics, which have high temperature resistance and high resistance to the coolants is provided.

[0021] The use of a water-glycol mixture, which has a high thermal capacity and can therefore better absorb and thus dissipate heat, can furthermore be provided as the coolant.

[0022] FIGS. 3 and 4 both illustrate a wound capacitor (10) according to an embodiment of the invention having a cooling channel (14). The plastic used for the cooling channel (14) (for example a fiber-reinforced duromer) is thermally conductive, electrically non-conductive and chemically resistant to the coolant, which can be a water-glycol mixture, for example.

[0023] As looking at FIGS. 3 and 4 together suggests, the possibilities for arranging such cooling channels (14) made of plastic are virtually limitless. However, both in terms of production practicality and for optimum cooling, heat dissipation at the central hot spot is recommended. In both variants, therefore, the respective cooling channel (14) extends coaxially through the wound capacitor (10).

[0024] The extensions of the inlet (15) and the outlet (16) of the wound capacitor (10), on the other hand, are different in the shown embodiments: Whereas they are aligned radially to the wound capacitor (10) in the embodiment according to FIG. 3, the inlet (15) and the outlet (16) according to FIG. 4 extend in the axial extension of the wound capacitor (10) and thus perpendicular to the front-side electrical terminals (13) thereof.

[0025] An embodiment can also provide that a plurality of wound capacitors have consecutive radial cooling channels which are interconnected (see FIG. 5 and FIG. 6). In this case, the capacitors can be connected in parallel or in series via busbars, for example made of copper or aluminum.

[0026] While subject matter of the present disclosure has been illustrated and described in detail in the drawings and foregoing description, such illustration and description are to be considered illustrative or exemplary and not restrictive. Any statement made herein characterizing the invention is also to be considered illustrative or exemplary and not restrictive as the invention is defined by the claims. It will be understood that changes and modifications may be made, by those of ordinary skill in the art, within the scope of the following claims, which may include any combination of features from different embodiments described above.

[0027] The terms used in the claims should be construed to have the broadest reasonable interpretation consistent with the foregoing description. For example, the use of the article “a” or “the” in introducing an element should not be interpreted as being exclusive of a plurality of elements. Likewise, the recitation of “or” should be interpreted as being inclusive, such that the recitation of “A or B” is not exclusive of “A and B,” unless it is clear from the context or the foregoing description that only one of A and B is intended. Further, the recitation of “at least one of A, B and C” should be interpreted as one or more of a group of elements consisting of A, B and C, and should not be interpreted as requiring at least one of each of the listed elements A, B and C, regardless of whether A, B and C are related as categories or otherwise. Moreover, the recitation of “A, B and/or C” or “at least one of A, B or C” should be interpreted as including any singular entity from the listed elements, e.g., A, any subset from the listed elements, e.g., A and B, or the entire list of elements A, B and C.