A split composite bus bar suitable for diesel locomotive power module

Abstract

The invention discloses a split composite bus bar suitable for diesel locomotive power module, which is composed of a DC bus bar and an AC bus bar. The DC bus bar and the AC bus bar adopt a split structure. The DC bus bar and the AC bus bar are both of flat structure, and a plurality of DC bus bars and the AC bus bars are stacked with each other and installed together through support pad columns arranged on the DC bus bar or the AC bus bar. The invention adopts the laminated composite bus bar to replace the cable, and the copper bar or the hot compressed bus bar are electrically connected, thereby reducing the complexity of the previous wiring, making the layout simple and the quality more reliable; The volume and weight of the system are reduced, and the repair and maintenance of the maincircuit are convenient. The invention adopts symmetrical design and is completely applicable to two power modules installed in a mirror image. The more important thing is to reduce the loop inductance, ensure the IGBT work safely and reliably, and greatly improve the reliability of the product. At present, it has been successfully applied in the diesel locomotive traction inverter + chopper module in a small batch, and has achieved good economic benefits.

Description

technical field [0001] The invention belongs to the technical field of locomotives and relates to a power module of an internal combustion locomotive, in particular to a split composite busbar suitable for the power module of an internal combustion locomotive. Background technique [0002] During the switching process of the power device of the high-power variable frequency power supply, due to the parasitic inductance on the DC bus between the DC energy storage capacitor and the IGBT device, and the inductance of the IGBT module itself, a high peak voltage will be generated, and the excessively high Accompanied by the increase of switching frequency, the peak voltage will cause the device to overheat, and sometimes even cause the IGBT to run out of control and exceed the rated safe working area of ​​the device and be damaged. To solve this problem, laminated composite busbars are usually used for electrical connection between power devices. It designs the main circuit bus ...

AI Technical Summary

Problems solved by technology

[0006] 1) The stray inductance of the circuit is large, causing voltage spikes, easily damaging power devices, and poor circuit reliability: When the main circuit electrical connection is connected with the usual cables, copper bars, and thermal busbars, the stray inductance of the circuit is large, and the IGBT switch During the process, high voltage peaks will be generated, which will have a certain impact on the power device and affect the life of the power device, thereby reducing the reliability of the power conversion circuit and affecting the average time between failures of the entire system.

[0007] 2) Inconvenient installation, bloated structure, and large space occupation: when the circuit is connected by cables, copper bars, and hot-coated bus bars, the electrical gap increases, resulting in an increase in the size of the entire power unit and an increase in the space occupied by the converter, which is not conducive to trains Overall space and total mass reduction

[0008] 3) The integration is low, multiple installations are required, and the operation is error-prone

[0009] 4) The structure and materials used do not meet the requirements of high ambient temperature and high humidity (environment temperature greater than 45°C, 100% humidity) environment

For a power module busbar with a high degree of integration, there are many switching devices connected, and the weight of the integrated busbar is relatively heavy. It is very difficult for a single worker to operate, and it is easy to generate downward mechanical impact when placed, which poses a safety hazard to the IGBT.

In addition, insulation materials must be added between the DC busbar and the AC busbar to meet the requirements of partial discharge, which increases the cost and weight

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