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参考例程BLPFC，做了一个基于F28035的4000W的无桥PFC。输入电流波形，很严重的一个台阶，而且还有些不对称，输入电流稍微超前。
更改了很多次电压环PI和电流环PI，效果始终不大，怎么引起的呢？
k空载驱动倒还挺好的。
和均方根无关
