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研究发现ＧＴＯ 动态热阻变化率的对数具有分区间近似线性的规律，提出可采用分段拟合的方法初步获得ＧＴＯ的高阶传热模型。基于最速下降原理构造了一种迭代算法，可以精确整定等效传热模型的各个参数，并研究了下降因子对迭代收敛性的影响。与ＧＴＯ 的实测动态热阻曲线比较，该模型的计算误差在±３％ 以内。将此传热模型集成在损耗分析软件中，可分析ＧＴＯ的瞬态传热特性。
It is found that the logarithm of dynamic thermal resistance change rate of GTO has the rule of linear approximation between subdivisions. The high order heat transfer model of GTO can be obtained preliminarily by the method of piecewise fitting. Based on the steepest descent principle, an iterative algorithm is constructed, which can accurately set various parameters of the equivalent heat transfer model and study the influence of the descent factor on the iterative convergence. Compared with the measured dynamic thermal resistance curve of GTO, the calculation error of this model is within ± 3%. Integrating this heat transfer model into the loss analysis software analyzes the transient heat transfer characteristics of the GTO.