【摘要】 本文首先对正弦脉宽调制(SPWM)的基本原理进行了说明,并利用付利叶级数对SPWM 基波进行了分析,得到载波比N 越大调制效果越好的结论,但N 受功率开关器件本身允许频率限制,N 不能过大.然后对SPWM 逆变器谐波进行了较具体的分析,分析了各种谐波对调制波形的影响,最后对全文进行了小结。更多还原

【Abstract】 In this paper, we make use of Fourier series to analyze the fundamental harmonic of the SPWM and make a conclusion that the larger carrier frequency ratio(N) is, the better resolution of modulation is. However, the N is limited by the frequency of power switch amplifier because it is not good if it is too large. Finally, we also analyze the SPWM inverter harmonic and the effects of series harmonic on performance of modulation wave concretely , and make a conclusion.更多还原