翅柱式IGBT水冷散热器的热仿真与实验

为分析翅柱式绝缘栅双极型晶体管(IGBT)水冷散热器的换热性能,利用Hyper Mesh软件对IGBT元件和完整散热器建立高质量的网格,通过FLUENT软件计算得到了水冷散热器内部槽道的流速分布、IGBT元件与水冷散热器的温度场分布。为验证仿真方法的可行性,建立了水冷测试系统进行温升实验。考虑到IGBT元件不能长时间工作在极限工况,损耗特性与结温互相影响以及内部芯片结温不便测量等问题,实验中采用了自制的模拟热源代替IGBT元件。以实验条件作为输入参数,建立模拟热源与水冷散热器的网格模型并求解计算,对比分析表明水冷散热器安装面上测温点仿真结果与实验数据的相对误差在4%以内。

Thermal Analysis and Test of IGBT Water-cooling Radiator with Pin-fins

In order to analysis the heat transfer performance of water-cooling radiator with pin-fins for insulated gate bipolar transistor (IGBT) module, the high quality grid of IGBT devices and complete radiator were generated by using HyperMesh software. The velocity distribution of water-cooling radiator's internal channel, the temperature field distribution of IGBT devices and water-cooling radiator were calculated by FLUENT software. For verify the feasibility of the simulation method, a water-cooling test system for temperature rise experiment was built up. Because IGBT device cannot work in extreme condition for long time, loss characteristics and junction temperature influences each other, and the internal chip junction temperature is difficult to measure, a man-made simulated heat source is used to replace the IGBT device in experiment. The grid model of simulated heat source and water-cooling radiator were generated and calculated based on the experiment condition as input parameters. By the comparative analysis between the simulation result of measuring points and the experimental data on water-cooling radiator's mounting surface, it indicate the relative error is less than 4%.