| 摘要 |
<p>A cross-complementing PWM driving waveform generation method and circuit. The method comprises the following steps: based on the rising edges and the falling edges of two paths of frequency-modulation PWM driving signals, frequency-halving the two paths of frequency-modulation PWM driving signals to obtain two groups, i.e. four paths of signals in total (S100); based on the two groups of generated signals, performing an exclusive-or operation on the first group of signals to obtain first sub-signals, and performing an exclusive-or operation on the second group of signals to obtain second sub-signals (S200); obtaining a first subgroup of signals and a second subgroup of signals through the logic operation of a trigger, an AND gate and an OR gate using the rising edges and the falling edges of the first sub-signals and the second sub-signals, the two subgroups of signals having a phase difference of 90°, and two paths of signals in each subgroup being complemented to each other (S300); and after negating the first sub-signals, respectively performing an AND operation on the first negated sub-signals and the two paths of signals of the first subgroup to obtain the first path of signals and the second path of signals, and after negating the second sub-signals, respectively performing an AND operation on the second negated sub-signals and the two paths of signals of the second subgroup to obtain the third path of signals and the fourth path of signals, the four paths of signals being four paths of PWM driving square waves with a cross-phase angle of 90° and a dead bandwidth (S400).</p> |
