CN104779818A - Inverter chopping wave composite busbar suitable for standardizing traction power module of electric motor unit - Google Patents

Abstract

The invention relates to a composite busbar used as a power unit component part, in particular to an inverter chopping wave composite busbar suitable for standardizing a traction power module of an electric motor unit. The inverter chopping wave composite busbar suitable for standardizing the traction power module of the electric motor unit is characterized by comprising a left composite busbar and a right composite busbar, wherein the left composite busbar as well as the right composite busbar is formed by stacking a positive busbar, a negative busbar and two alternating-current busbars in sequence; the left composite busbar and the right composite busbar are in left and right mirror image symmetry structurally; the positive busbar, the negative busbar and the two alternating-current busbars are flat-shaped structurally; each busbar on the left composite busbar and the right composite busbar is isolated by an insulating material. According to the inverter chopping wave composite busbar provided by the invention, the circuit inductance and the main circuit oscillation are reduced, and the work reliability of an IGBT (Insulated Gate Bipolar Translator) is improved; the structure is simple, the production difficulty is reduced, and the cost is reduced; the system volume and the weight are reduced.

Description

Be applicable to the inversion copped wave composite bus bar of standardization motor train unit traction power module

Technical field

The present invention relates to the composite bus bar as power cell component parts, be specially the inversion copped wave composite bus bar being applicable to standardization motor train unit traction power module.

Background technology

The power device of high power frequency conversion power supply is in switching process, connect owing to adopting cable or copper bar between main circuit component, the impact of the stray inductance the DC bus between from DC energy storage electric capacity to IGBT module and IGBT module own inductance, very high peak voltage can be produced, this peak voltage can make to be increased by the electric current of device, finally cause device overheated, even sometimes, make IGBT out of control and exceed the load rated safety service area of device and damage, for addressing this is that, employing composite bus bar carries out the electrical connection between power device usually.What current motor train unit generally used is all functional single power cell, such as converter module, chopped power unit, integrated level is not high, composite bus bar as component parts is also like this, inversion busbar is separated with copped wave busbar, belong to different power cells, be not integrated in same power cell, composite bus bar structure is asymmetric.And the composite bus bar adopted largely is referred from external matured product or improves on this basis, and the composition of autonomous Design is little.

The main circuit of said structure causes following problem: 1) circuit stray inductance is large, and power device easily damages, and circuit reliability is poor, efficiency is low.When connecting with cable between main circuit component, the stray inductance of circuit is comparatively large, in main circuit switch process, higher due to voltage spikes will be produced in IGBT device, there is certain impact to power device, affect the life-span of power device, thus reduce the reliability of power conversion circuit; 2) integrated level is low, and cost is high, takes up space large.Many one times of the inversion chopped power unit component that two power cell costs that the converter module of general one piece of inversion composite bus bar formation and the chopped power unit of one piece of copped wave composite bus bar formation form are formed than an inversion copped wave busbar, cost doubles, and in converter system, turn increasing the space of a power cell, the weight of whole converter system and space increase.

Summary of the invention

The present invention, in order to solve inversion chopped power unit and there is main circuit cable or copper bar stray inductance being large, integrated level is low, cost is high and the problem such as large that takes up space, provides the inversion copped wave composite bus bar being applicable to standardization motor train unit traction power module.

The present invention adopts following technical scheme to realize: the inversion copped wave composite bus bar being applicable to standardization motor train unit traction power module, comprise left composite bus bar and right composite bus bar, left composite bus bar and right composite bus bar are all built up according to the order of sequence by a positive busbar, a negative busbar and two alternating current bus bars, left and right specular in left composite bus bar and right composite bus bar structure, and positive busbar, negative busbar and alternating current bus bar structure are flat, isolate between each busbar with insulating material.

This composite bus bar can be used as the component parts of inversion chopped power unit, wherein left composite bus bar can be arranged two inverter bridge legs, right composite bus bar can be arranged an inverter bridge leg and a copped wave brachium pontis, which reduce system power element number, reduce system bulk, weight and noise, and the maintenance and the maintenance that facilitate main circuit; Known by Theory of Electromagnetic Field in addition, line is made flat cross section, the more Bao Yuekuan done under same cross section, its stray inductance is less, flows through contrary electric current in adjacent wires, its magnetic field cancellation, also stray inductance can be made to reduce, and adjacent conductor spacing is less, stray inductance is less.According to above theory, busbar is designed to flat, and is stacked together according to certain order that stacks, with insulating material isolation between every layer, so not only meet the requirement of low sense, improve the reliability of IGBT work, also can simplify the device structure, reduced volume.

The technique effect that the present invention brings is:

1) reduce loop inductance and power circuit oscillation, improve the reliability of IGBT work;

2) structure is simple, reduces production difficulty, provides cost savings;

3) system bulk and weight is reduced.

Accompanying drawing explanation

Fig. 1 is inversion chopped power unit main circuit schematic diagram.

Fig. 2 is inversion copped wave composite bus bar structural representation.

Fig. 3 is inversion copped wave composite bus bar electric interfaces figure.

Embodiment

Be applicable to the inversion copped wave composite bus bar of standardization motor train unit traction power module, comprise left composite bus bar and right composite bus bar, left composite bus bar and right composite bus bar are all built up according to the order of sequence by a positive busbar, a negative busbar and two alternating current bus bars.Left and right specular in left composite bus bar and right composite bus bar structure, and positive busbar, negative busbar and alternating current bus bar structure are flat, and with insulating material isolation between each busbar, as shown in Figure 2.

During concrete enforcement, inversion unit and copped wave unit are integrated into a complete power cell by the present invention, and complete the electrical connection between them by composite bus bar, and main circuit principle as shown in Figure 1.According to circuit theory diagrams, H1aIGBT and B1aIGBT forms an inverter bridge leg, H2aIGBT and B2aIGBT forms an inverter bridge leg, H1bIGBT and B1bIGBT forms an inverter bridge leg, H2b and B2bIGBT forms a copped wave brachium pontis, and three inverter bridge legs add a copped wave brachium pontis and form an inversion chopper circuit.This inversion copped wave composite bus bar is left and right mirror image, be made up of two pieces of composite bus bars, one piece of left composite bus bar, one piece of right composite bus bar, every block composite bus bar is all made up of a positive busbar S1 (+), a negative busbar S2 (-) and two alternating current bus bars; Alternating current bus bar is respectively S3 (U), S4 (V), S5(W) and S6(C); DC master row, i.e. S1 (+), S2 (-), wherein S3 (U), S4 (V), S5(W) be invert function output, S6(C) be copped wave fuction output.S3 (U), S5(W) and S4 (V), S6(C) be mirror image, DC master row S1 (+), S2 (-) they are also left and right mirror image, and concrete structure is as shown in Figure 3.

According to circuit theory, left composite bus bar and right composite bus bar are divided into four layers, i.e. positive busbar, negative busbar and two-phase alternating current bus bar, left composite bus bar and right composite bus bar all adopt the copper bar that 3mm is thick, copper bar surface electrolytic tinning 8um(100% tin), maximum alternating current is 520A, direct-current working volts are 3600V, dielectric voltage withstand is 9600V, minimum creep distance: >=50mm, minimum electric clearance: >=26mm.

Claims (1)

1. be applicable to the inversion copped wave composite bus bar of standardization motor train unit traction power module, it is characterized in that comprising left composite bus bar and right composite bus bar, left composite bus bar and right composite bus bar are all built up according to the order of sequence by a positive busbar, a negative busbar and two alternating current bus bars, left and right specular in left composite bus bar and right composite bus bar structure, and positive busbar, negative busbar and alternating current bus bar structure are flat, isolate between each busbar with insulating material.