6SN1118-0NH11-0AA0

6SN1118-0NH11-0AA0

对于PWM而言，由于脉冲的宽度是不变的，因此，下图中相邻两条蓝色虚线对应的时间是不变的，调制的是中间绿色虚线的时间，也就是脉冲宽度，通过调节开关的导通时间来控制脉冲宽度。对信号1进行调制，按某个规律进行脉宽调制，从而获得信号2，信号1与信号2的原始频率是相同的（因为开关周期没有变化），只是脉冲宽度不同。如果开关周期时刻发生变化，则对应的调制称为脉冲频率调制。

将脉冲宽度按正弦规律变化进行调制，调制成想要的正弦波，若要改变等效输出正弦波幅值，按同一比例改变各脉冲宽度即可。

6SN1118-0NH11-0AA0

6SN1118-0NH11-0AA0

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