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controlsuit例程无桥PFC中关于计算均方根电压和频率

 就是sineanalyzer这个模块,输入Vrect,输出Vrms,
请问:1,Vrect的波形大致什么样子?
2,计算这个Vrms,有什么用?它的波形什么样子?
谢谢!