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msp430产生三相spwm的问题

您好!

    用msp430生成三相spwm波时,会出现两路波形正常,一路波形失真的问题,并且都是第一路波形失真,用PID算法调整spwm的脉宽,三相波形失真。如果同时生成六路spwm,则六路的频率同时降低。

   期待您的回复