针对功率器件热建模速度与准确度相互制约问题,研究了一种基于傅里叶级数的功率器件热建模仿真方法。方法采用傅里叶级数求解热传导方程以获取器件内部温度分布函数,求解过程建模简单,且容易与电路模型共同建立热电仿真模型。采用Matlab/Simulink平台,建立了一维热电仿真模型。仿真结果表明:该方法仿真同时具备速度快、准确度高的优点。 Aiming at the mutual restriction between the speed and accuracy of thermal modeling of power devices, a thermal modeling and simulation method for power devices based on Fourier series is studied. Methods The Fourier series was used to solve the heat conduction equation to get the temperature distribution function inside the device. The modeling of the solving process was simple and easy to establish the thermoelectric simulation model with the circuit model. Using Matlab / Simulink platform, a one-dimensional thermoelectric simulation model was established. Simulation results show that this method has the advantages of fast speed and high accuracy.