Direct-current filter capacitor for converter module

Abstract

The utility model relates to the technical field of railway vehicles, in particular to a direct-current filter capacitor for a converter module. Comprising a low-inductance busbar, a positioning plate, a positioning bracket, a core group, a shell and a core group connecting copper bar, the core groups are connected in parallel through the core group connecting copper bars, and are simultaneously connected to the low-inductance busbar as an external wiring busbar; according to the low-inductance busbar, through the structure that the positioning support and the positioning plate are fixed in a matched mode, the direct-current filter capacitor is adapted to the interior of the converter, the inductance content of the capacitor is effectively reduced, and the overall inductance content requirement of an inverter module is met.

Description

Technical Field

[0001] The utility model relates to the technical field of rail vehicles, in particular to a DC filter capacitor for a converter module. Background Art

[0002] With the continuous advancement of rail vehicle technology, traction system converter modules are rapidly evolving towards miniaturization and lightweighting. This trend requires that the module's internal components maintain high performance while minimizing their size and weight to accommodate tighter installation spaces and improve overall vehicle efficiency. However, miniaturization and lightweighting also bring new challenges, especially the increased switching frequency of the modules, which places higher demands on component performance.

[0003] In the inverter modules of rail vehicle traction systems, DC filter capacitors, as key components, are responsible for filtering out pulsating DC voltage and maintaining output voltage stability. However, traditional DC capacitors typically use insulator electrodes as external connections. While simple and reliable, this design suffers from high inductance. As the module switching frequency increases, the high inductance leads to large voltage fluctuations and resonance when the current flows through the capacitor, thus affecting the filtering effect and the overall performance of the inverter module. Utility Model Content

[0004] The purpose of this utility model is to provide a DC filter capacitor for a converter module to address the defects in the prior art, so that the DC filter capacitor can be adapted to the converter and the inductance content of the capacitor itself can be effectively reduced to meet the overall inductance content requirements of the inverter module.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is: a compact explosion-proof electric

[0006] A voltage transformer includes a low-inductance busbar, a positioning plate, a positioning bracket, a core group, a shell, and a core group connecting copper busbar; the core groups are connected in parallel through the core group connecting copper busbar and are simultaneously connected to the low-inductance busbar as an external wiring busbar; the low-inductance busbar is fixed by the positioning bracket and the positioning plate.

[0007] Furthermore, polyurethane is injected into the interior of the low-sensitivity busbar for the second time.

[0008] Furthermore, the self-inductance of the DC filter capacitor is ≤15nH.

[0009] Furthermore, the core group connecting copper bar is arranged on the shell, and its length direction is perpendicular to the low-inductance busbar.

[0010] Furthermore, the positioning plate is arranged on a side of the shell close to the low-sensitivity busbar.

[0011] Furthermore, the positioning bracket is arranged on the top of the positioning plate and cooperates to fix the low-inductance busbar.

[0012] Furthermore, the positioning bracket and the positioning plate are made of insulating material.

[0013] The structure includes a low-inductance busbar, a positioning plate, a positioning bracket, a core group, a shell, and a core group connecting copper busbar; the core groups are connected in parallel through the core group connecting copper busbar and are simultaneously connected to the low-inductance busbar as an external wiring busbar; the low-inductance busbar is fixed by the positioning bracket and the positioning plate, so that the DC filter capacitor is adapted to the converter and the inductance content of the capacitor itself is effectively reduced to meet the overall inductance content requirement of the inverter module. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0015] Figure 1 This is the internal structure diagram of the utility model;

[0016] Figure 2 This is a schematic diagram of the core assembly of the utility model;

[0017] Figure 3 This is the appearance diagram of the utility model;

[0018] Reference numerals:

[0019] Low-inductance busbar 1, positioning plate 2, positioning bracket 3, core group 4, shell 5, core group connecting copper busbar 6. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0021] In the description of the present invention, it should be noted that the orientations or positional relationships indicated by “center”, “up”, “down”, “left”, “right”, “vertical”, “horizontal”, “inside” and “outside” are 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 device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0022] A DC filter capacitor for a converter module, such as Figure 1 、 2 As shown in Figure 3, it includes a low-inductance busbar 1, a positioning plate 2, a positioning bracket 3, a core group 4, a shell 5, and a core group connecting copper busbar 6; the core group 4 is connected in parallel through the core group connecting copper busbar 6, and is simultaneously connected to the low-inductance busbar 1 as an external wiring busbar; the low-inductance busbar 1 is fixed by the positioning bracket 3 and the positioning plate 2.

[0023] Specifically, by directly using low-inductance busbar 1 as the external wiring busbar, the inductance of the capacitor itself is significantly reduced. This design innovation not only improves the stability of the capacitor in high-frequency operating environments, but also reduces electromagnetic interference, thereby improving the electrical performance of the entire converter module. The core groups 4 are connected in parallel via core group connection copper busbar 6 and directly connected to low-inductance busbar 1, ensuring the scalability of the capacitance value while further reducing inductance by eliminating unnecessary connection paths. At the same time, this connection method also simplifies the circuit layout and improves the system integration. Through the precise matching of the positioning plate 2 and the positioning bracket 3, the stable installation of the internal components of the capacitor is ensured, which not only enhances the mechanical strength of the capacitor, but also optimizes the overall heat dissipation performance, so that the capacitor can maintain stable performance during long-term high-load operation. The design of the shell 5 fully considers the needs of miniaturization and lightweight, while ensuring sufficient internal space to accommodate various components and maintain good heat dissipation performance, which helps to reduce the volume and weight of the entire converter module, in line with the current development trend of rail vehicle traction systems. Using a low-inductance busbar as an external connection type, it can be directly connected to the low-inductance busbar connected to the IGBT to reduce the overall inductance content of the module.

[0024] As a preferred embodiment of the above, Figure 1 、 3 As shown, the interior of the low-sensitivity busbar 1 is filled with polyurethane for the second time.

[0025] Specifically, by secondary pouring polyurethane into the low-inductance busbar 1, a secondary pouring process is introduced, which not only enhances the electrical insulation performance of the busbar, but also improves its mechanical stability and durability, and can reduce the magnetic field generated by the current inside the busbar, thereby reducing the inductance value.

[0026] As a preferred embodiment of the above, Figure 1 、 3 As shown, the self-inductance of the DC filter capacitor is ≤15nH.

[0027] As a preferred embodiment of the above, Figure 3 As shown, the core group connecting copper busbar 6 is arranged on the shell 5, and its length direction is perpendicular to the low-inductance busbar 1.

[0028] Specifically, by vertically arranging the core group connecting copper busbar 6 to the low-inductance busbar 1, the vertical space of the housing 5 can be effectively utilized, making the overall structure more compact. The vertically arranged copper busbar can reduce interference with other components, making the internal layout more reasonable, and facilitating heat dissipation and electromagnetic shielding. The vertically arranged copper busbar further reduces the overall inductance of the capacitor by shortening the current path or optimizing the current distribution, further improving the performance of the capacitor in high-frequency working environments, reducing signal distortion and energy loss, and making the capacitor installation process simpler and faster. At the same time, due to the clear layout and high space utilization, the risk of failure caused by improper installation is also reduced.

[0029] As a preferred embodiment of the above, Figure 3 As shown, the positioning bracket 3 is arranged on the top of the positioning plate 2 and cooperates to fix the low-inductance busbar 1.

[0030] Specifically, the positioning bracket 3 is directly set on the top of the positioning plate 2, which provides a stable support for the low-inductance busbar 1, effectively preventing the busbar from being displaced or loosened under vibration or impact conditions, and ensuring the stability and reliability of the capacitor structure. The stable fixing method helps to reduce the contact resistance between the low-inductance busbar 1 and other components, helps to reduce energy loss and temperature rise, and improve the electrical performance and efficiency of the capacitor. The low-inductance busbar of the DC filter capacitor is tightened and fixed to the shell 5 through the positioning bracket 3 and the fixing plate 2, further ensuring the internal electrical clearance and creepage distance.

[0031] As a preferred embodiment of the above, Figure 1 、 3 As shown, the positioning bracket 3 and the positioning plate 2 are made of insulating materials.

[0032] Specifically, by configuring the positioning bracket 3 and the positioning plate 2 to be made of insulating materials, the interference of the external environment on the internal circuit of the device is reduced, thereby improving the stability and reliability of the device.

[0033] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements are intended to fall within the scope of the present invention. The scope of protection claimed in this invention is defined by the appended claims and their equivalents.

Claims

1. A DC filter capacitor for a converter module, characterized by: Including low-sensitivity busbar (1), Positioning plate (2), positioning bracket (3), core group (4), housing (5), core group connecting copper bar (6); The core group (4) is connected in parallel via the core group connecting copper bus (6), and is simultaneously connected to the low-inductance busbar (1) as an external wiring busbar; The low-sensitivity busbar (1) is fixed by the positioning bracket (3) and the positioning plate (2).

2. The DC filter capacitor for the converter module according to claim 1, characterized in that: The interior of the low-sensitivity busbar (1) is filled with polyurethane for the second time.

3. The DC filter capacitor for the converter module according to claim 1, characterized in that: The self-inductance of the DC filter capacitor is ≤15nH.

4. The DC filter capacitor for a converter module according to claim 1, characterized in that: The core group connecting copper busbar (6) is arranged on the housing (5), and its length direction is perpendicular to the low-inductance busbar (1).

5. The DC filter capacitor for a converter module according to claim 1, characterized in that: The positioning plate (2) is arranged on a side of the housing (5) close to the low-sensitivity busbar (1).

6. The DC filter capacitor for the converter module according to claim 5, characterized in that: The positioning bracket (3) is arranged at the top end of the positioning plate (2) and cooperates to fix the low-sensitivity busbar (1).

7. The DC filter capacitor for the converter module according to claim 6, characterized in that: The positioning bracket (3) and the positioning plate (2) are made of insulating material.

Images