磁势自平衡回馈补偿式直流传感器检测回路分析

Detection Circuit Analysis of DC Sensor Based on Self-balance of Magnetic Potential and Feedback Compensation

在磁势自平衡回馈补偿式直流传感器中,检测回路利用一对铁芯和线圈对一次被测电流和二次平衡电流磁势之差进行检测。在分析检测铁芯磁通变化的基础上,对检测回路进行了理论研究,给出了检测灵敏度的计算表达式。通过分析表达式,提出了几种改进检测灵敏度的措施,这些措施在试验中得到了验证。

In the DC sensor based on self-balance of magnetic potential and feedback compensation,the difference of primary measured current and secondary balanced current is detected by the detection circuit with a pair of cores and coils.The output voltage and detection sensitivity of detection circuit is calculated in theory based on the analysis of the detection cores' active state.Several improved measures of detection sensitivity are put forward.