Design Of IGBT Module Radiator

IGBT,as a new type of power device,is widely used in manufacturing,industry,rail transit,military,new energy,smart grid,pure electric vehicle and other high-tech fields.It is mainly used as the core control components.Its advantages are fast switching speed and high reliability.However,due to the high working frequeney,the power consumption is high and a lot of heat is generated.If IGBT devices are not heat dissipated or cooled in time,their performance will be seriously affected,which will greatly reduce the reliability,increase the unsafe factors and even lead to their failure.Therefore,it is of great significance to discuss and study the heat dissipation of IGBT module.Firstly,the causes of IGBT module failure are discussed and analyzed.It is concluded that the main cause of IGBT module failure is module overheating.At the same time,the power consumption of IGBT module is discussed and analyzed.It is concluded that the on-state loss and switching loss of IGBT module are the fundamental causes of heat generation,and the corresponding calculation method is given.Secondly,the analysis method of water-cooled radiator is determined.Three kinds of water-cooled radiator models with runner structure are built by simulation software:series structure model,parallel structure model and series-parallel hybrid structure model.Each structure model is simulated.The temperature,pressure and fluid velocity curves of each radiator model are obtained by simulation data.The advantages and disadvantages of the three models are compared in these three dimensions.Finally,the parallel structure is chosen as the basic model.The water-cooled radiator model of multi-parallel channel structure is obtained by optimizing the radiator model of parallel structure.The 6063 series aluminium alloy with low density,moderate thernal conductivity and high specific heat capacity is selected as the refrigerant and the pure water with low density,low viscosity,high thermal conductivity and high specific heat capacity is used as the refrigerant.Finally,the heat dissipation performance of IGBT module water-cooled radiator with multi-parallel structure is simulated and analyzed,and the influence rules of different water flow velocity,different ambient temperature and different water temperature on the radiator are discussed.It is verified that the multi-parallel structure model meets the heat dissipation requirements of IGBT module.