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用28x做三相相控整流

我在用28M35做三相可控硅的相控整流,初步想法是用100us的PWM中断结合CAP中断来做,CAP捕获同步信号,触发角用PWM中断计时。但是这样精度比较差,各位大虾有什么好的建议可以把触发精度做得准一些?