| The inverter is one of the core components used in drive system of the electric bus.A compact modular design is proposed for electric bus inverter in this paper. The capacitors and power switch are connected by laminated busbar used in DC side, which decrease the additional overvoltage in the power module and improve the reliability of the system. The main circuit is built with two unit IGBT(Insulated Gate Bipolar Transistor) module as a bridge arm, which make the whole system have the advantages of highly integrated,small,light,low cost. However, low inductance design of laminated busbars and cooling design of cold plate become two challenges which need to be solved in the new design.In this paper, resistance calculation and hot simulation method have been applied in the studies of cold plate. According to the concept of equivalent thermal resistance, the simplified simulation model is built. The comparison results of the numerical simulation and ICEPAK software show that the effectiveness of the thermal resistance model proposed in this dissertation.Then, as to various flow structure, the S-shaped flow is selected as the optimization under the flow and heat transfer characteristics simulation analysis The temperature field and pressure drop of S-shaped channel cold plates are simulated to optimize the flow channel structure.And then, the inlet flow rate is designed with the final optimal parameters. Finally, this paper proposes a tube cold plate with high cooling efficiency on the basis of optimizing the structure of flow channel. On the other hand, this paper summarizes the method of structure design to reduce stray inductance based on the research of the laminated busbar low inductance design. On this basis,the structural optimization of busbar has been realized.In this paper, the laminated busbar structure optimization design and thethermal design of module can meet the design requirements of the new project. On the other hand, the optimization of cold plate structure can be applied to other high power devices on the radiator. The research result is valuable to engineering application. |
