Capacitor

Abstract

The utility model discloses a capacitor, which comprises a shell, a capacitor core group, a Y capacitor and two direct-current busbars, wherein the capacitor core group, the Y capacitor and the two direct-current busbars are arranged in the shell; the two direct-current busbars are respectively and electrically connected with one end surface of the capacitor core group and partially extend out of the shell for wiring; and the direction of a connecting line between the positive electrode and the negative electrode of the Y capacitor is vertical to the current direction of the two direct-current busbars. According to the technical scheme of the embodiment of the utility model, the self-inductance parameter of the capacitor can be reduced, and the EMC performance of a system is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic devices, in particular to a capacitor. Background Art

[0002] With the rapid development of power electronics technology, metallized film capacitors are increasingly used in industrial control, new energy, automotive electronics, rail transit, power grids and other fields. With the upgrading of products, new application platforms have increasingly higher requirements for the electrical performance of capacitors. Among them, the performance test of electromagnetic compatibility (EMC) is crucial in the system-level test of inverters or controllers, and the self-inductance parameters of capacitors also play a decisive role in the performance of EMC. Therefore, how to reduce the self-inductance parameters of capacitors and ensure the EMC performance of the system has become a technical problem that needs to be solved urgently. Utility Model Content

[0003] The utility model aims to solve one of the technical problems in the above technology at least to a certain extent. To this end, the purpose of the utility model is to provide a capacitor to reduce the self-inductance parameter of the capacitor and ensure the EMC performance of the system.

[0004] To achieve the above-mentioned purpose, an embodiment of the utility model proposes a capacitor, comprising a shell, a capacitor core group, a Y capacitor and two DC busbars arranged in the shell; the two DC busbars are respectively electrically connected to one end surface of the capacitor core group, and partially extend out of the shell for wiring; the connection direction between the positive and negative poles of the Y capacitor is perpendicular to the current direction of the two DC busbars.

[0005] According to the capacitor of the embodiment of the utility model, the Y capacitor is arranged inside the shell, and the connection direction between the positive and negative electrodes of the Y capacitor is perpendicular to the current direction of the two DC busbars, thereby reducing the self-inductance parameter of the capacitor and ensuring the EMC performance of the system.

[0006] In addition, a capacitor according to the above embodiment of the utility model may also have the following additional technical features:

[0007] Optionally, the DC busbar includes a connecting end and a lead-out end that are connected to each other, the connecting end is used to be electrically connected to the end face of the capacitor core group, the lead-out end partially extends out of the shell, the lead-out ends of the two DC busbars overlap and an insulating film is arranged between the two; the Y capacitor is arranged on one side of one of the two lead-out ends, and the connection direction between the positive and negative poles of the Y capacitor is perpendicular to the length direction of the lead-out end.

[0008] Optionally, the capacitor core group includes a plurality of cores, a plurality of welding openings are provided on the connection end, the welding openings are arranged corresponding to the cores, and a welding strip is extended radially inwardly from the edge of the welding opening.

[0009] Optionally, a bending portion is provided on a side of the connection end away from the lead-out end to at least partially wrap a side surface of the capacitor core group.

[0010] Optionally, the Y capacitor includes at least one of a bare core Y capacitor, a powder packaged Y capacitor and a plastic shell Y capacitor. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 Schematic diagram of the structure of a capacitor according to an embodiment of the utility model.

[0012] Description of reference numerals: capacitor core assembly 100 , Y capacitor 200 , DC busbar 300 , connection end 310 , lead-out end 320 , welding port 311 , welding bar 312 , bending portion 313 , insulating film 400 . DETAILED DESCRIPTION

[0013] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0014] In order to better understand the above technical solution, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0015] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0016] Please refer to Figure 1 The embodiment of the utility model provides a capacitor, including a shell (not shown in the figure), a capacitor core group 100, a Y capacitor 200 and two DC busbars 300.

[0017] Among them, the shell is a cylindrical structure (such as a square cylinder or a cylinder, etc.) for the placement of other components. After the other components are placed, the shell can be filled with potting material to fix the other components. The capacitor core group 100 and the two DC busbars 300 are placed inside the shell. Specifically, the capacitor core group 100 includes two end faces, and the two DC busbars 300 are electrically connected to one end face of the capacitor core group 100 respectively, and partially extend out of the shell. The parts of the two DC busbars 300 extending out of the shell can be used as the positive and negative poles of the capacitor for external wiring. The Y capacitor 200 is also arranged in the shell, and the connection direction between the positive and negative poles of the Y capacitor 200 is perpendicular to the current direction of the two DC busbars 300, so that the self-inductance parameter between the DC end of the capacitor and the Y capacitor 200 can be reduced, thereby ensuring the EMC performance of the system.

[0018] In one embodiment of the utility model, each DC busbar 300 includes a connecting terminal 310 and a lead-out terminal 320 connected to each other. The connecting terminal 310 can be in any shape, such as a plate or strip shape. The connecting terminal 310 can be in contact with and fixed to the end surface of the capacitor core group 100 to achieve electrical connection between the two. One end of the lead-out terminal 320 is connected to the connecting terminal 310, and the other end partially extends out of the shell to serve as the positive or negative electrode of the capacitor. The lead-out terminals 320 of the two DC busbars 300 are led out of the shell from the same position, the two lead-out terminals 320 overlap, and an insulating film 400 is provided between the two lead-out terminals 320 to prevent short circuit.

[0019] The Y capacitor 200 is arranged on one side of one of the two lead-out terminals 320. Specifically, the Y capacitor 200 is located on one side of the two lead-out terminals 320 away from the other lead-out terminal 320, and the connection direction between the positive and negative electrodes of the Y capacitor 200 is perpendicular to the length direction of the lead-out terminal 320, thereby making the connection direction between the positive and negative electrodes of the Y capacitor 200 perpendicular to the current direction of the two DC busbars 300, so as to reduce the self-inductance parameter between the DC end of the capacitor and the Y capacitor 200, and ensure the EMC performance of the system. In an example, the Y capacitor 200 may include at least one of a bare core Y capacitor, a powder packaged Y capacitor, and a plastic shell Y capacitor, which is not specifically limited in this application.

[0020] In one embodiment, a bending portion 313 is provided on the side of the connection end 310 away from the lead-out end 320, so that the side of the capacitor core group 100 can be at least partially wrapped by the bending portion 313. The setting of the bending portion 313 can avoid relative movement between the DC busbar 300 and the capacitor core group 100, thereby ensuring the stability of the electrical connection between the DC busbar 300 and the capacitor core group 100.

[0021] In one embodiment of the utility model, the capacitor core group 100 includes a plurality of cores, and a plurality of welding ports 311 are provided on the connection end 310. The welding ports 311 can be of any shape, such as square or circular. The welding ports 311 are provided corresponding to the cores. In one example, one welding port 311 can correspond to one core, or a plurality of welding ports 311 can correspond to one core to ensure the stability of the electrical connection. A welding strip 312 extends radially inward from the edge of the welding port 311. The welding strip 312 extends from the edge of the welding port 311 to the center thereof. The operator can weld the welding strip 312 to the end surface of the core through the welding port 311 to form a fixation.

[0022] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0023] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0024] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms should not be understood as necessarily being directed to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification.

[0025] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A capacitor, characterized in that: It comprises a shell, a capacitor core group, a Y capacitor and two DC busbars arranged in the shell; the two DC busbars are electrically connected to one end surface of the capacitor core group respectively, and partially extend out of the shell for wiring; the connection direction between the positive and negative poles of the Y capacitor is perpendicular to the current direction of the two DC busbars.

2. The capacitor according to claim 1, characterized in that The DC busbar includes a connecting end and a lead-out end, wherein the connecting end is used to be electrically connected to the end surface of the capacitor core group, and the lead-out end partially extends out of the shell, and the lead-out ends of the two DC busbars overlap with each other and an insulating film is arranged between the two. The Y capacitor is arranged on one side of one of the two lead-out ends, and the connection direction between the positive and negative electrodes of the Y capacitor is perpendicular to the length direction of the lead-out end.

3. The capacitor according to claim 2, characterized in that The capacitor core group includes a plurality of cores. The connection end is provided with a plurality of welding openings, the welding openings are arranged corresponding to the cores, and a welding strip is extended radially inwardly from the edge of the welding opening.

4. The capacitor according to claim 2, characterized in that A bending portion is provided on a side of the connection end away from the lead-out end to at least partially wrap the side surface of the capacitor core group.

5. The capacitor according to any one of claims 1 to 4, characterized in that: The Y capacitor includes at least one of a bare core Y capacitor, a powder packaged Y capacitor and a plastic shell Y capacitor.

Images