整流器件热分析及其风冷散热器的仿真研究

Thermal Analysison Rectifier Device and Simulation Studies on its Air-cooling Radiator

研究整流器优化散热结构设计问题,对电力变换装置小型化和高功率密度要求越来越严格,功率器件散热技术研究和分析变得尤为重要,针对散热器结构散热性差,影响工作的稳定性。为了能够直观和准确地获得散热器温度场的分布特性,根据传热理论建立了整流器件散热的物理模型,采用了热分析方法(有限元法),应用ANSYS软件对风冷散热器温度场进行了数值计算。计算中考虑了整流器件在风冷散热器上的整体布局,着重对两种肋片形状的风冷散热器进行了仿真,结果对比两种风冷散热器的传热效果。给出了风冷散热器优化设计后的实际结构,为散热优化提供了参考。

With more and more stringent requirements for miniaturization and high power density in electric power devices,the research and analysis on the thermal problems become particularly important.In this paper,the theories for the thermal analyses on power devices are introduced,and the physical model for rectifier modules cooling system is proposed.The Finite Element Method（FEM） is determined as the analysis method,by which the temperature field of an air-cooling radiator is calculated numerically.Based on the analysis,the basic operating process of ANSYS software in handling such thermal problems is summarized.Considering the overall distribution of the rectifier modules on one air-cooling radiator,temperature fields of air-cooling radiators with two different shape fins are simulated.Based on the comparisons of the heat transfer affections in such different air-cooling radiators,a new-type practical structure for air-cooling radiator is proposed.