某风冷电源热分析及优化设计

Thermal Analysis and Optimal Design of an Air-cooled Power Supply Based on Incepak

针对强迫风冷电源中功率器件密度日益增高,热流密度增大,高温环境下易出现热失效,需在降额温度之下工作的问题,研究其整机热分析及机箱散热器结构优化设计。首先基于各功率器件热耗、机箱散热器结构、环境边界条件等参数,利用CAE仿真软件建立符合物理模型的仿真模型,并进行热仿真分析,得到温度分布云图;然后分析基板厚度、鳍片形状等结构尺寸参数对电源散热性能的影响,同时对散热器结构尺寸进行优化,并确定了散热器最优结构。最后建立了基于散热器最优结构的实体样机,开展高温实验。通过实验数据与仿真数据对比分析,得出最大误差仅为3.5%的结果,证实了计算结果的准确性。结果表明:利用软件进行热仿真及散热器优化的举措是可靠的,且优化后的散热器满足功率器件的降额要求及电源机箱的散热需求。研究结果体现了散热仿真分析的必要性,为风冷机箱的应用提供理论和实践支持。

In response to the increasing density of power devices and heat flux in forced air-cooled power supplies,which are prone to thermal failure in high-temperature environments and require operation at reduced temperatures,the thermal analysis of the entire machine and the optimization design of the chassis heat sink structure are studied.Firstly,based on parameters such as heat consumption of each power device,chassis heat sink structure,and environmental boundary conditions,a simulation model that conforms to the physical model is established using CAE simulation software,and thermal simulation analysis is conducted to obtain a temperature distribution cloud map.The influence of structural size parameters is analyzed such as substrate thickness and fin shape on the heat dissipation performance of the power supply,the structural size of the heat sink is optimized,and the optimal structure of the heat sink is determined.Finally,a physical prototype based on the optimal structure of the radiator is established to conduct high-temperature experiments.Through comparative analysis of experimental data and simulation data,a result with a maximum error of only 3.5%is obtained,confirming the accuracy of the calculation results.The results indicate that the use of software for thermal simulation and heat sink optimization is reliable,and the optimized heat sink meets the derating requirements of power devices and the heat dissipation requirements of the power supply chassis.The research results reflect the necessity of heat dissipation simulation analysis,providing theoretical and practical support for the application of air-cooled chassis.