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自己搭建了电压过零检测电路和电流过零检测电路仿真模型,仿真电路输出与分析不符合。

电压过零检测的问题:在输入电压大于50V时比较器输出为脉冲波形,正常应该为方波才对?将输入电压由电压发生器更换为电压源时,电路就输出不了波形了。电压源为直流电源,应该一样能够比较。输出高电平或低电平?