用PIC16F876A产生2路SPWM波，经GAL16V8变换成4路，在分别用A3120去推动IGBT,经过LC滤波最终得到50HZ的正弦波。 -PIC16F876A have used 2-way SPWM wave by GAL16V8 converted into 4-way, in the A3120, respectively, to promote the use of IGBT, after LC filter finally 50HZ sine wave.