Structural Design And Simulation Of High Power IPM Module

With the continuous development of IGBT technology,the application of high power IPM module in industrial production is more and more extensive.The IPM module is often applied to the variable flow system with DC voltage of 600 V and above such as AC motor,frequency converter,switching power supply and other fields.With the increasing integration of Power module,the increasing of power and the decreasing of volume,the working heat of Power module is increasing.The reasonable power unit structure and the layout of DBC substrate chip are beneficial to improve the heat dissipation of the power module.Therefore,the further exploration and research of the IPM internal Key structure will be helpful to the optimization design of the IPM structure and the improvement of its heat dissipation performance.This paper introduces the development of high power IGBT module and IPM structure at home and abroad.Based on the finite element software,the power unit and the cooling unit structure of IPM are studied and designed.Firstly,the structural features,properties and functions of the IGBT module are analyzed,and the structure of the IPM is also introduced.Secondly,based on the existing 1700V/1200 A IGBT module,this paper uses the finite element software to design the IPM power unit and the heat dissipation unit structure and the steady-state thermal simulation is finished.According to the other laboratory data,the correctness of the model is verified.The IPM power unit structure design is completed with the new technology,including welding technology optimization,structural material optimization and internal structure optimization.By using the sintering technology replace the original welding technology.Adopting new material and new internal structure to reduce the thermal stress effect between different structures,and effectively reduce the temperature of the module steady state,enhance the service life of the module.By comparing the steady-state temperature distribution of IGBT module in ANSYS Workbench software,the rationality and reliability of the design are verified.Finally,it is determined that the current is measured using the integrated shunt in the power unit.Through the research and analysis of the internal structure layout and parasitic inductance of the power unit,the structure of the power unit is designed.According to the structure of the power unit,the size of the radiating element is determined.The structure of high power IPM is obtained by analyzing the heat dissipation part of IPM.