DSDO120

从结构上看，由于采用了 IGBT 功率元件， 所以它相当于一个逆变器，不同的是其输入为交流输出为直流，因为它位于电源进线侧， 所以被称为前端。其主动的含义在于，与传统的二级管或可控制硅整流技术相比，主动前端不再是被动地将交流转变成直流，而是具备了很多主动的控制功能。它不仅能高次谐波，提高功率因数， 而且不受电网波动的影响， 具有的动态特性。

---- 主动前端（AFE〕整流单元的工作原理可简述为：AFE整流单元从电网汲取正弦波交流，经整流后输出直流电压，并保持所要求的电压值。各次谐波由滤波电路删除。

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DSDO120