使用大量的有限元法求解偏微分方程，计算加权加速度,pwm整流器的建模仿真，DC-DC部分采用定功率单环控制，有CDF三角函数曲线/三维曲线图。- Using a large number of finite element method to solve partial differential equations, Weighted acceleration, Modeling and simulation pwm rectifier DC-DC power single-part set-loop control, There CDF trigonometric curve/3D graphs.