Metro traction inversion chopping power unit

Abstract

The invention relates to a metro traction inversion chopping power unit. The metro traction inversion chopping power unit comprises a radiator, seven IGBT (insulated gate bipolar transistor) devices, seven IGBT configuration plates, four IGBT driver boards, a diode device, six absorption capacitors and composite busbars; According to the invention, a braking chopper circuit and an inverter circuit are centralized to one power unit, and share only one set of heat pipe radiator, so that the occupied area of vehicle space is reduced; the composite busbars are used as main circuit busbars, so that the electric clearances and absorption circuit accessories between the busbars as well as between the busbars and a support framework are reduced, the size of a power unit is reduced, and the reliability is increased; through the adoption of the laminated structure, the IGBT driver board components are all mounted on the outer side of a module, so that the replacing and maintenance are convenient. According to the metro traction inversion chopping power unit, the size of the entire power unit is reduced, the space is saved, and the maintenance efficiency is improved; therefore, the utilization ratio of a subway train is increased, and the operation cost is reduced.

Description

technical field [0001] The invention relates to the technical field of subway traction systems, in particular to a subway traction inverter chopper power unit. Background technique [0002] With the rapid development of high-power semiconductor device IGBT manufacturing technology and drive technology, as the core component of the traction converter in the subway traction system, the traction inverter power unit has also been developed rapidly, towards high-frequency miniaturization and high reliability. direction development. [0003] The input of the traction inverter chopper power unit comes from the DC voltage of the subway power grid. The IGBT is selected as the switching device, and the purpose of outputting the three-phase AC voltage is achieved through the inverter method, and then the traction motor of the subway is controlled to realize the traction function. At the same time, with the cooperation of the traction converter control system, the brake chopper functio...

AI Technical Summary

Problems solved by technology

[0004] Existing technology 1: 1) Common copper bars are used to connect the components of the main circuit of the traction inverter power unit, and the IGBT absorbing circuit is complicated; 2) The driving board is directly installed on the IGBT or independently installed on the upper layer of the IGBT

[0005] The disadvantages of prior art 1 are: 1) The circuit is connected by ordinary copper bars, and the electrical gap increases, resulting in an increase in the volume of the entire power unit and an increase in the space occupied by the converter; in addition, the stray inductance of ordinary copper bars is large, requiring additional A lot of absorption circuits are installed, resulting in complex circuit structure and more accessories, which reduces the reliability of the entire power unit

2) The driver board is directly installed on the IGBT or independently installed on the upper layer of the IGBT, which makes it inconvenient to maintain the power unit. When replacing the IGBT device or the driver board, there are many accessories that need to be removed, which is not only cumbersome and time-consuming, but also the reliability after maintenance. Not guaranteed

[0007] The disadvantage of the second prior art is: the two are independent, and two sets of radiators are required, which takes up a lot of space in the vehicle

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