Direct-current capacitor series-parallel laminated busbar for SVG (Static Var Generator) power module

Abstract

A direct-current capacitor series-parallel laminated busbar for an SVG power module relates to the technical field of electrical connection and comprises a laminated busbar and a base plate, capacitor mounting holes are distributed on the laminated busbar, a capacitor is mounted in each capacitor mounting hole, and the capacitor mounting holes are communicated with the base plate. The laminated busbar comprises a plurality of layers of thin copper sheets located inside and an insulating film located outside, every two adjacent thin copper sheets are connected, each capacitor installation hole penetrates through the corresponding thin copper sheet, and the capacitors are electrically connected with the thin copper sheets. Two layers of thin copper are laid inside the busbar, so that parasitic inductance of the busbar is remarkably reduced, current can be better distributed, the problems of local overheating and uneven current density are reduced, the phenomenon that peak voltage occurs in the working period of a capacitor is greatly reduced, and the performance and reliability of a whole power electronic system are improved.

Description

Technical Field

[0001] This utility model relates to the field of electrical connection technology, and in particular to a DC capacitor series-parallel stacked busbar for SVG power modules. Background Technology

[0002] With societal development, especially the advancement and application of power supply technology, capacitors are increasingly being used in these devices. The issue of series and parallel connection methods for capacitors has always been a research hotspot, because an imperfect series and parallel connection can cause excessively high voltage spikes, which can severely damage power electronic devices and other equipment.

[0003] Currently, the most common approach to solving the above problems is to use soldered circuit boards with internal copper wire connections. This method facilitates capacitor connections, but it is not very effective in addressing voltage spikes generated by capacitors. Utility Model Content

[0004] The purpose of this invention is to provide a DC capacitor series-parallel stacked busbar for SVG power modules to solve the problems mentioned in the background art.

[0005] The technical problem solved by this utility model is achieved through the following technical solution:

[0006] A DC capacitor series-parallel stacked busbar for an SVG power module includes a stacked busbar and a base plate. The stacked busbar has capacitor mounting holes distributed on it, and a capacitor is installed in each of the capacitor mounting holes. The bottom of the capacitor is fixedly mounted on the base plate. The stacked busbar includes several layers of thin copper sheets inside and an outer insulating film. Adjacent thin copper sheets are connected to each other. Each capacitor mounting hole passes through the thin copper sheets, and the capacitor is electrically connected to the thin copper sheets.

[0007] Preferably, the thin copper sheet is configured as two layers, and the insulating film is respectively connected to the upper end face and the bottom end face of the two layers of thin copper sheet.

[0008] Preferably, the stacked busbar has an extension portion on its rear side, and mounting ears are symmetrically fixedly installed on the extension portion on both the left and right sides.

[0009] Preferably, the capacitor is fixedly connected by a nut, and a spring washer is provided on the underside of the nut.

[0010] Preferably, the base plate has an extension on its rear end face, and the extension has strip-shaped holes evenly distributed throughout it.

[0011] The advantages and positive effects of this utility model are:

[0012] This invention significantly reduces the parasitic inductance of the busbar connected to the capacitor by laying two layers of thin copper inside, which can better distribute the current and reduce problems such as local overheating and uneven current density. When the current is evenly distributed on the multi-layer copper busbar, the current borne by each part is relatively small, which helps to reduce voltage spikes caused by current changes, thereby greatly reducing the phenomenon of voltage spikes in the capacitor during operation, thus improving the performance and reliability of the entire power electronic system. Attached Figure Description

[0013] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0014] Figure 1 This is a schematic diagram of the overall structure of a DC capacitor series-parallel stacked busbar for an SVG power module according to the present invention;

[0015] Figure 2 This is a schematic diagram of another perspective of the DC capacitor series-parallel stacked busbar structure for SVG power modules according to this utility model;

[0016] Figure 3 This is a partial structural diagram of the stacked busbar in a DC capacitor series-parallel stacked busbar for an SVG power module according to the present invention;

[0017] Figure 4 This is a partial structural diagram of the mounting lug position in a DC capacitor series-parallel stacked busbar for an SVG power module according to this utility model;

[0018] Figure 5 This is a partially enlarged structural diagram of the connection between the stacked busbar and the extension portion in a DC capacitor series-parallel stacked busbar for an SVG power module according to this utility model.

[0019] Figure 6 This is a schematic diagram of the base plate in a DC capacitor series-parallel stacked busbar for an SVG power module.

[0020] Figure 7 This is a schematic diagram illustrating the installation of a DC capacitor series-parallel stacked busbar for SVG power modules.

[0021] The markings in the attached diagram are described as follows: 10 stacked busbar; 11 extension portion; 12 mounting lug; 13 capacitor; 14 base plate; 15 capacitor mounting hole; 101 thin copper sheet; 102 insulating film. Detailed Implementation

[0022] The present invention will now be described in further detail with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention. These drawings are simplified schematic diagrams, which are only used to illustrate the basic structure of the present invention in an illustrative manner. Therefore, they only show the components related to the present invention.

[0023] To facilitate understanding of this utility model, a more comprehensive description of the utility model will be given below with reference to the accompanying drawings, which show several embodiments of the utility model. However, the utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of the utility model will be more thorough and complete.

[0024] The following is combined with Figure 1-7 This utility model will be described in detail below. For ease of description, the directions mentioned below are defined as follows: the directions of up, down, left, right, front, and back mentioned below are the same as... Figure 1 The directions of front, back, left, right, up, and down in the view are consistent. Figure 1 The directions shown are consistent with the front-facing, back-facing, left-right, up-down directions of the device.

[0025] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, a direct connection, or an indirect connection through an intermediate medium; they can refer to the internal communication of at least two elements or the interaction relationship of at least two elements, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0026] The embodiments of this utility model will be further described in detail below with reference to the accompanying drawings:

[0027] Please see Figure 1-7This utility model provides an embodiment of a DC capacitor series-parallel stacked busbar for an SVG power module, comprising a stacked busbar 10, a base plate 14, and six capacitors 13. Capacitor mounting holes 15 are distributed in the capacitor mounting holes 15, and the six capacitors 13 are respectively fixedly mounted in the capacitor mounting holes 15 by bolts and nuts. The six capacitors are connected in parallel, each capacitor does not interfere with the others, and the installation is stable. The bottoms of the six capacitors 13 are all fixedly connected to the base plate 14, which is installed inside the SVG module. It should be noted that, in order to effectively reduce the peak voltage of the capacitors 13 during operation... The stacked busbar 10 is configured as having several layers of thin copper sheets 101 inside and an insulating film 102 covering the outside. The thin copper sheets 101 are compositely connected, with two layers of thin copper sheets 101 used here. The insulating film 102 is connected to the upper and lower end faces of the two layers of thin copper sheets 101 respectively. Therefore, the two layers of thin copper sheets 101 are compositely connected under the wrapping of the insulating film 102. At the same time, the capacitor mounting holes 15 all penetrate the thin copper sheets 101, so that the capacitor 13 is electrically connected to the thin copper sheets 101. The terminals led out from the thin copper sheets 101 can be used to connect power electronic devices, thereby greatly reducing the phenomenon of voltage spikes in the capacitor during operation.

[0028] It should also be noted that spring washers are provided on the lower side of the nut position fixed at the top of the capacitor 13 to increase the reliability of the bolt connection and prevent the nut from loosening.

[0029] It is worth mentioning that, in this embodiment, an extension portion 11 is provided on the rear side of the stacked busbar 10, and mounting ears 12 are symmetrically fixed on the left and right sides of the extension portion 11, so as to facilitate fixing it inside the SVG module or on other devices.

[0030] It should also be noted that, in order to facilitate installation and adjustment, in this embodiment, an extension is provided on the rear end face of the base plate 14, and strip-shaped holes are evenly distributed on the extension, so as to facilitate installation and position adjustment inside the SVG module.

[0031] In practice, the base plate 14 is first fixedly installed inside the SVG module, and the capacitor 13 and its extension 11 are fixed to the inner wall of the SVG module through the mounting ears 12. By laying two layers of thin copper inside the busbar connected to the capacitor, the parasitic inductance of the busbar is significantly reduced, the current can be better distributed, and the problems of local overheating and uneven current density can be reduced. When the current is evenly distributed on the multi-layer copper busbar, the current borne by each part is relatively small, which helps to reduce the voltage spikes caused by current changes, thereby greatly reducing the phenomenon of voltage spikes in the capacitor during operation, thus improving the performance and reliability of the entire power electronic system.

[0032] It should be emphasized that the embodiments described in this utility model are illustrative rather than limiting. Therefore, this utility model is not limited to the embodiments described in the specific implementation. Any other implementation methods derived by those skilled in the art based on the technical solutions of this utility model are also within the scope of protection of this utility model.

Claims

1. A DC capacitor series-parallel stacked busbar for an SVG power module, comprising a stacked busbar (10) and a base plate (14), characterized in that: The stacked busbar (10) is provided with capacitor mounting holes (15), and each capacitor mounting hole (15) is installed with a capacitor (13). The bottom of the capacitor (13) is fixedly installed on the base plate (14). The stacked busbar (10) includes several layers of thin copper sheets (101) inside and an insulating film (102) outside. Two adjacent thin copper sheets (101) are connected. Each capacitor mounting hole (15) passes through the thin copper sheet (101), and the capacitor (13) is electrically connected to the thin copper sheet (101). An extension portion (11) is provided on the rear side of the stacked busbar (10), and mounting ears (12) are symmetrically fixedly installed on the left and right sides of the extension portion (11).

2. The DC capacitor series-parallel stacked busbar for an SVG power module according to claim 1, characterized in that: The thin copper sheet (101) is configured as two layers, and the insulating film (102) is respectively connected to the upper end face and the bottom end face of the two layers of thin copper sheet (101).

3. A DC capacitor series-parallel stacked busbar for an SVG power module according to claim 1, characterized in that: The capacitor (13) is fixedly connected by a nut, and a spring washer is provided on the underside of the nut.

4. A DC capacitor series-parallel stacked busbar for an SVG power module according to claim 1, characterized in that: An extension is provided on the rear end face of the base plate (14), and strip-shaped holes are distributed at equal intervals on the extension.

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