这个电路是把电流互感器的交流信号,半波精密整流成直流,最后送到单片机AD转换器。在没有任何信号输入的时候c27上面有60mv直流输出,原来运放LM358没有这样的情况,因为电源电压3.3v,LM358不能满副输出所有换上LMV358.
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