三种SPWM波形生成算法的分析与实现

变频技术作为现代电力电子的核心技术，集现代电子、信息和智能技术于一体。而SPWM(正弦波脉宽调制)波的产生和控制则是变频技术的核心之一。本文对SPWM 波形生成的三种算法--对称规则采样法、不对称规则采样法和等效面积法分别加以分析，并通过高精度定点32 位DSP 微处理器TMS320F2812 在线生成SPWM 波形。实验表明采用对称规则采样法产生的SPWM 波形，具有速度快、变频方便等优点。采用等效面积法产生的SPWM 波形具有精度高、输出波形谐波小，对称性好等优点。不对称规则采样法的性能介于二者之间。
关键词：正弦脉冲宽度调制(SPWM)；规则采样法；等效面积法；TMS320F2812
Abstract:As the kernel technology of modern power electronics,frequency conversion technology unites the technologies of modern electronics,information and intelligence.The generating and controll of Sinusoidal Pulse-Width Modulation (SPWM) waveforms is one of the core technology of frequency conversion.Three algorithms for SPWM waves are analyzed in this paper,which are symmetry rule sampling method,asymmetry rule sampling method and equiarea algorithm.The SPWM waves are realized by TMS320F2812 DSP.The experimetal results show that symmetry rule sampling method has advantages of fast speed and converting frequency easily.They also show that the SPWM waves generated by equiarea algorithm have advantages of high precision,small harmonic value of output waves and good symmetry.And the performances of the SPWM waves by asymmetry rule sampling method are between the two algorithms above.
Keywords: SPWM; rule sampling method;equiarea algorithm;TMS320F2812