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 waveform through the appropriate filter can do.It is widely used in dc ac inverter.)