《IC698CPE010》-可编程控制器

《IC698CPE010》

《IC698CPE010》

 SPWM法从电动机供电电源的角度出发，着眼于如何产生一个可调频调压的三相对称正弦波电源。具体方法是以一个正弦波作为基准波（称为调制波），用一列等幅的三角波（称载波）与基准正弦波相交，由它们的交点确定逆变器的开关模式。为了提高逆变器的输出电压幅值，针对SPWM法，人们提出了准优化 PWM法，即三次谐波叠加法。在正弦波中注入一定比例的三次谐波后，调制波的幅值大大降低，在调制波没有过调制的情况下，可使基波幅值超过三角波幅值，实现调制系数大于1的调制。在这种调制方式下，zui大调制比可提高到1.15左右，相应直流母线电压的利用率zui大可提高15%。

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