5X00481G01

5X00481G01

5X00481G01

罗氏线圈是将导线均匀的密绕在环形截面非磁性骨架上而形成的空心电感线圈，采用罗氏线圈作为电网中电流测量的传感头，让通有大电流的导线垂直穿过线圈的中心，产生电磁感应，从而感应出被测电流大小的电压信号。将罗氏线圈产生的电压信号接入到信号调理模块上，进行信号处理，最后输出工业标准信号DC4-20mA。电路设计框架图如图1所示。

2.1信号调理电路

    信号调理电路实现对输入信号的隔离输入，包括信号滤波、整流电路以及信号积分电路。该电路主要是对罗氏线圈感应输出的电压信号通过RC滤波，再经过电阻分压后接入到采用双电源运放芯片的输入脚上，采用运算放大器构成近似积分器，合理选择选择器件参数，能够保证传感器的测量灵敏度、精度和信号响应带宽。

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