一种光学电流互感器的设计

Design of Optical Current Transducer

介绍了一种基于火石玻璃Faraday磁光效应的光学电流互感器的传感机理、系统设计及试验结果,它把被测电流转换成电压,然后与偏置电压共同作用,LED发出受电流强度调制的光,PIN探测器把光信号转化成电信号,经电路处理,最后得到与被测电流成正比的电压。分析了电流与光强度变化的关系,实验表明,测量系统线性度较好。说明了影响光学电流互感器性能的主要因素及解决对策,指出了需解决的问题,并展望了光学电流互感器的发展前景。

Introduces the fundamental principle, system design and test results of a new Current Transformer. It converts the measured current into voltage, then the voltage combines with bias voltage source to drive a LED which emits light modulated by current strength. A PIN detects the light and converts it to voltage signal. After the circuit processing, we finally get voltage which is proportional to the measured current. The relations of current and light intensity are analyzed. Experiments show that the method can obtain good linearity. Main factors and stratagies of affecting the performace of OCT are reviewed. The common problems solved in the design of OCTs are stated,and the prospects of OCTs are forecasted.