基于正交分析法的功率模块散热器的数值研究

电子技术的发展促使功率模块的体积越来越小，功率密度越来越大，需要采用强迫风冷的方式冷却功率模块，选择合理的散热器，保证散热效果变得尤为重要。通过分析文献以及工程实践，找出影响散热器散热效果的主要因素。以某SVG功率模块为例，根据正交试验表，利用数值模拟的方法得到不同散热器下的温度分布图和IGBT表面的最高温度，分析影响散热效果的主要因素，得到翅片角度、间距、厚度和长度等因素对散热效果的影响规律。结果表明，对散热效果的影响排序为翅片高度、倾斜角度、间距、厚度。综合各种因素，最佳的搭配方案，即垂直翅片，翅片厚度为4mm，翅片间距为3nlnl，翅片长度为90mm。

A Numerical Simulation Study on the Radiator of Power Module Based on Orthogonal Analysis Method

With the development of electronic technology, the volume of power module becomes smaller and smaller, while the power density is bigger and bigger. Selecting rational radiator to guarantee the cooling effect is partic- ularly important. Through literature and engineering practice analyzing, this paper finds out the main influencing factors on the radiator cooling effect. Taking the SVG power module as an example, according to orthogonal test ta- ble, the temperature distribution on the surface of IGBT under different radiators is obtained by the method of nu- merical simulation. By analyzing the main influencing factors on the cooling effect, the influence rule of fin angle, spacing, thickness and length on the cooling effect is got. The results show that, the impact sort on the cooling effect is fin height, angle, spacing and thickness. In eonelusion, 4 mm in thickness, 3 mm in spacing, and 90 mm in length is the optimal collocation scheme for the vertical fin.