微元法生成SPWM的算法研究与实现

Research and Implementation of the Algorithm Using Infinitesimal Method to Create SPWM

提出用微元法生成SPWM的算法。采用微积分学中微元法这一原理,将基波分割成有限数量的微元。基于采样控制理论,使用等周期、不同占空比的PWM对每项微元等效替代,将其产生的SPWM通过低通滤波器形成所需基波。与现有成熟的SPWM算法进行了对比,讨论了其优点和创新点部分,并推理论证;基于Msp430f169处理器,给出使用MATLAB产生正弦表的程序,对其提出了改进方案。

Present an algorithm using infinitesimal method to create SPWM, which uses the principle of infinitesimal meth- od coming from the calculus, to split the fundamental wave as limited number of infinitesimals. Then based on Sampled Da ta Control Theory ,it uses PWM having equal cycle and different duty cycle to replace equally each infinitesimal. Finally It makes the SPWM created just now to across the LPF. On the base of contrasting with the mature algorithms of SPWM, the article discusses the advantages and some innovations, and demonstrates some inference and authentication. And it gives the matlab code of creating the table of sines based on the MCU msp430f169. At end it presents a method of im- provement.