Thermal modeling for the air-cooling system of power converters
To enhance the operational reliability of power converters and accurately assess the thermal dissipation state of air-cooling systems,this study proposes a novel thermal modeling method for air-cooled heat sinks.First,a three-dimensional lumped-parameter thermal model for air-cooled heat sinks is developed based on fluid dynamics and heat transfer theories,taking into account the effects of air temperature variations and inlet blockage.Second,the power module losses are calculated through simulation,and Computational Fluid Dynamics(CFD)software is employed to simulate the heat sink temperatures under various blockage levels,thereby validating the three-dimensional thermal network model.Finally,an experimental platform is established to compare the measured heat sink tempera-tures with those obtained from the two-dimensional and three-dimensional thermal network models.The results indicate that the proposed three-dimensional thermal network model achieves an average calculation error of 1.8%,which is 5.1%lower than that of the traditional two-dimensional model.This approach provides a robust reference for evaluating the thermal state of cooling systems.
power converterair-cooling systemthermal dissipation statethermal modeling
万方数据
维普
