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spwm滤波后，出现的馒头波的频率，和理论值不一样，怎么回事

lin wen
Expert 1670 points


三角波fr=30kHZ,正弦波fc=50HZ,N=600;

用规则采样法，

采用增减计数模式

脉宽值

 duty=500*(sin(6.283*k1/600));

EPwm2Regs.CMPA.half.CMPA = duty;
EPwm2Regs.CMPB = duty;

馒头波的频率，应该为50hz,但通过示波器观察却为10hz,为什么会这样