Efficient Solution Methods for IGBT Electro-Thermal Coupling Models Based on Optimized Nonlinear Multigrid Algorithms

With the rapid development of power electronics technology, the application of IGBTs (Insulated Gate Bipolar Transistors) in high-efficiency power conversion has become increasingly widespread. The electro-thermal coupling effect of IGBTs significantly impacts their stability and reliability. Therefore, accurately and quickly solving the electro-thermal coupling model is key to enhancing the design and application efficiency of IGBTs. This paper proposes a solution method based on an optimized Nonlinear Multigrid (NMG) algorithm aimed at improving the solution speed and accuracy of the IGBT electro-thermal coupling model. By introducing the hysteresis diffusion fixed-point iteration and successive over-relaxation iteration strategies, we optimized the traditional NMG algorithm to adapt to the specific requirements of the electro-thermal coupling model. Experimental results show that the optimized NMG algorithm not only significantly enhances the solution efficiency and reduces computation time but also improves the model's solution accuracy. Compared to traditional solution methods, our approach demonstrates clear advantages in the stability and efficiency of model solving. The successful implementation of this research provides a new perspective and tool for the efficient solution of IGBT electro-thermal coupling models, holding significant theoretical and practical significance for optimizing the thermal management design of power electronic devices.