Signal collection and conditioning circuit and method for low-voltage topology recognition

According to the signal collection and conditioning circuit and method for low-voltage topology recognition, targeted collection and amplification are carried out on the frequency band where characteristic current is located, large fundamental wave (50Hz) current on a branch current line is suppressed, and the situation that the gain of the conditioning circuit is limited by the magnitude of the fundamental wave current before the characteristic current enters a processor for analysis is prevented. Therefore, the output signal of the Rogowski coil is connected with the high-order active filter circuit. The current component of the required characteristic frequency band is extracted and amplified in a targeted manner, and the current component outside the characteristic frequency band is effectively suppressed, especially the fundamental wave 50Hz current signal is suppressed. 本发明提出一种用于低压拓扑识别的信号采集与调理电路及方法，对特征电流所在的频段进行针对性采集、放大，并且对分支电流线上较大的基波（50Hz）电流进行抑制，防止在进入处理器分析之前，调理电路的增益受基波电流大小的限制。为此，提出将罗氏线圈的输出信号与高阶有源滤波电路相连接