Brake chopper composite busbar

Abstract

The invention relates to a brake chopper composite busbar. With the brake chopper composite busbar adopted, problems such as large stray inductance of a main loop, poor circuit reliability, inconvenient installation, bloated structure, large occupied space and high design cost in the prior art can be solved. The brake chopper composite busbar of the invention includes an L-shaped flat O busbar, an L-shaped flat N busbar and an L-shaped flat P busbar which are stacked together; high-insulation strength materials are arranged between adjacent busbars; the O busbar is provided with an O connecting portion and O wiring terminals; the N busbar is provided with an N connecting portion and N wiring terminals; and the P busbar is provided with a P connecting portion and P wiring terminals. According to the brake chopper composite busbar of the invention, the stacked composite busbars are adopted to replace cables, copper bars or hot-compress busbars to perform electrical connection, and therefore, the complexity of previous wring can be lowered, and layout can be simple, and quality is more reliable; the size and weight of a system can be reduced, and repair and maintenance of a main circuit can be facilitated; and loop inductance can be reduced, and an IGBT can work safely and reliably, and the reliability of products can be greatly enhanced.

Description

technical field [0001] The invention relates to the technical field of electronics and electricity, in particular to a brake chopper composite busbar. Background technique [0002] With the great-leap-forward development of China's railways, high-speed, heavy-duty, high-power EMUs or electric locomotives gallop on various high-speed railways and railway lines. The key to the high-speed, safe and reliable operation of EMUs lies in the performance of their traction and auxiliary systems good or bad. Today, with the development of high-voltage and high-current traction auxiliary converters to high frequency, the parasitic parameters of the main circuit connecting lines produce huge electrical stress, which is an important factor that reduces the reliability of power electronic devices. 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 ...

AI Technical Summary

Problems solved by technology

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 The peak voltage, accompanied by the increase of the switching frequency, 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

[0003] In the prior art, the electrical connection between key components in the main circuit, such as IGBT, freewheeling diode, etc., is usually connected by cables, copper bars, and thermally applied bus bars, which have the following disadvantages: 1) The stray inductance of the circuit is large, which will cause voltage Spikes, easy to damage power devices, and poor circuit reliability: the electrical connections between key components in the main circuit such as IGBTs, freewheeling diodes, etc. are usually connected by cables, copper bars, and thermal busbars, and the stray inductance of the circuit is large. During the IGBT switching process, a high voltage peak 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

2) Inconvenient installation, bloated structure, and large space occupation: when the circuit is connected with 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 affects the entire space of the train reduction and reduction in total mass

3) The connection of the two main circuits is not uniform, and the design cost is high

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