20200721 Sawtooth PWM和Symmetrical PWM
上面是锯齿，下面是对称的
The following figures illustrate the different Regular Sampling methods. In the figure on the left, double edge sampling is used, i.e. the modulation index is updated at both tips of the triangular carrier. In the right figure, single edge sampling is employed. Here, the modulation index is updated only at the upper tips of the carrier.
明显上面double edge的精度高一点。。。
载波尖峰和三角调制波的交点，再和载波相交，产生PWM波
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