變頻技術作為現代電力電子的核心技術，集現代電子、信息和智能技術于一體。而SPWM(正弦波脈寬調制)波的產生和控制則是變頻技術的核心之一。本文對SPWM 波形生成的三種算法--對稱規則采樣法、不對稱規則采樣法和等效面積法分別加以分析，并通過高精度定點32 位DSP 微處理器TMS320F2812 在線生成SPWM 波形。實驗表明采用對稱規則采樣法產生的SPWM 波形，具有速度快、變頻方便等優點。采用等效面積法產生的SPWM 波形具有精度高、輸出波形諧波小，對稱性好等優點。不對稱規則采樣法的性能介于二者之間。
關鍵詞：正弦脈沖寬度調制(SPWM)；規則采樣法；等效面積法；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