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有关无桥PFC的问题

Other Parts Discussed in Thread: UCC3818, UCC28070

您好;

我参考了UCC28070无桥应用笔记,用UCC3818设计了一台 设计了  双升压无桥PFC , 共用一个磁环作为升压电感,用互感器分别检测两个相和输出电流,但轻在效率很差,PF也很差,满载的时候才能过98.5% ,

这个钛金效率过不了!  ???