光纤电流互感器用半导体激光器数字驱动电路设计

半导体激光器的输出性能直接决定了光纤电流互感器的测量精度和长期运行稳定性。为提高光纤电流互感器的测量精度与稳定性,设计了一种高精度半导体激光器数字驱动电路。以STM32微控制器为控制核心,利用高精度电流源芯片ADN8810实现驱动电流的精密控制,同时采用集成温控芯片MAX1978通过控制半导体制冷片的工作电流实现对激光器温度的精确控制。经实验测试,其输出电流稳定度为0.028%,温度控制稳定度为0.18%,激光器输出光功率稳定度达到0.06%,输出波长稳定度为0.05pm。该设计能够满足光纤电流互感器对光源输出性能的要求。

Design of All Digital Drive Circuit of Semiconductor Lasers for Fiber Optical Current Transformer

The output performance of semiconductor laser directly determines the measurement accuracy and long-term operation stability of the optical fiber current transformer. Thus in order to improve its measurement accuracy and stability, a high-precision digital driver circuit of semiconductor laser was designed. STM32 microcontroller was used as the main control chip, high-precision current source chip ADN8810 was used to control the driving current precisely. And integrated temperature control chip MAX1978 was adopted to control the working current of semiconductor coolers to realize the precise temperature control. The experimental results prove that the output current stability is 0.028% and the stability of temperature control is 0.18%. The optical power stability reaches 0.06%, and the wavelength stability reaches 0.05pm. The design can meet the output performance requirements of light source of the optical fiber current transformer.