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PFC直流电压采样问题

Other Parts Discussed in Thread: UCD3138

如图,在PFC整流后的直流电压进行采样时,两个分压电阻分别各自并联一只电容。怎么理解?

如果说下面的C2可以起到相位延迟,上面的C1的作用是什么 ?