Light source control of fiber-optical current transducer

With the deepening development of the smart electric grid construction,fiber-optical current transducer(FOCT)has become the research focus,and its stability has been concerned gradually. The light source stability of FOCT is studied emphatically in this article. The different solutions were designed according to the two main factors of temperature and drive current affecting on the stability. In the aspect of temperature control,two design schemes of temperature control circuit are put forward.Finally,the digital temperature control circuit was adopted according to the actual demands. In the aspect of drive current control,based on the traditional scheme,the scheme of adjusting the drive current according to light source and light power was designed. The two schemes were verified in experiments. The experimental results show that the new scheme can improve the light source reliability and stability of the transducer.