(正弦脉宽调制)是由控制回路产生一组等幅而不等宽的矩形脉冲列，用来近似正弦电压波。
SPWM is a set of constant amplitude but unconstant width rectangular serial pulse produced by control return circuit to approximate sinusoidal voltage waves.
研究了输入电压源为单矩形脉冲电压的特例。
The special example in which the circuit is driven by single rectangle pulse is investigated.
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