高频磁电耦合电流传感器调理电路设计与实现

Design and Implementation of Conditioning Circuit for High Frequency Magneto Electric Coupling Current Sensor

摘要:

针对新型电力系统中兆赫兹级高频暂态电流分量的探测需求，介绍了一款剪切模式高频磁电耦合电流传感器的敏感机理和结构设计。为有效提升该电流传感器的灵敏度、探测极限等核心性能，设计并研制了一款高频调理电路，通过仿真分析对其性能做出判断，进一步搭建了一套高频电流试验系统对其进行了试验验证。试验结果表明，经过调理后的灵敏度达到14.24 mV/mA，线性拟合度（R平方）达到0.999 68，0.9~1.1 MHz频率范围内输出信号有效值的变化波动小于3%，探测极限达到10 μA以内。该调理电路显著提升了磁电耦合电流传感器的高频探测性能，对于新型电力系统中高达MHz频率的高频暂态电流分量探测具有很好的应用潜力。

Abstract:

The sensing mechanism and structure design of a d15 mode high-frequency magnetoelectric coupling current sensor is introduced for detection needs of high-frequency transient current component up to MHz level in new power system. In order to effectively improve sensitivity, detection limit and other core performances of current sensor, a high-frequency conditioning circuit is designed and developed, and its performances are estimated by simulation. Furthermore, a high-frequency current test system is established to verify its performances. The experimental result shows that the sensitivity under conditioning reaches 14.24 mV/mA, the linear regression coefficient reaches 0.999 68, the fluctuation of output signal RMS is less than 3% within the frequency range of 0.9 MHz to 1.1 MHz, and the detection limit is within 10μA. This conditioning circuit significantly improves the high-frequency detection performance of magnetoelectric coupling current sensor, which has great potential for high-frequency transient current component detection up to MHz frequency in new power system.