6SN1118-0NH01-0AA0

6SN1118-0NH01-0AA0

6SN1118-0NH01-0AA0

2. PWM控制技术基本思想

我国交流电的频率是50Hz，因此，交流电的波形是正弦波。那么，PWM控制技术的目标就是用什么样的信号或波形来代替这个正弦波交流电。这个信号可以是形状不同的各种窄脉冲，如方波、三角波等。而在我们今天要讲的电动汽车中采用的是等幅但不等宽的脉冲来代替这个正弦波。

在这以半个正弦波为例进行说明，将正弦半波进行N等分，可以看成是N个相连的脉冲序列，宽度相等，但幅值不等，如下图a）所示。然后用矩形脉冲代替这N个宽度相等，幅值不等的脉冲，而矩形脉冲是等幅，不等宽的脉冲，如下图b)所示。并且这个脉冲的宽度按正弦规律变化。而这一系列等幅不等宽的脉冲，我们称之为PWM波。

6SN1118-0NH01-0AA0 

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