所谓SPWM，就是在PWM的基础上改变了调制脉冲方式，脉冲宽度时间占空比按正弦规律排列，这样输出波形经过适当的滤波可以做到正弦波输出。它广泛地用于直流交流逆变器.(So-called SPWM, is changed on the basis of the PWM pulse modulation, pulse width time arrange duty ratio according to the sine law, so that the output sine wave output