高精度多通道激光器恒定驱动电源研究与设计

Design and Research of Constant Drive Power Supply for High Precision Multi-Channel Lasers

摘要:

为了对多个激光器进行可靠性测试,实现分时工作,同时降低驱动电路体积,选用多路选择开关和多路模拟开关以实现多通道下光电二极管PD和雪崩光电二极管APD的切换,通过设置DAC数模转换芯片不同工作点电压,实现一种可以驱动多通道不同型号激光器的恒定驱动电源电路。电路设计中利用深度负反馈原理来提高系统的稳定度,设计了双OPA和MOS管进一步减小漏电流引起的偏差,优化了电压-电流线性度；软件设计中引入强化学习Actor-Critic框架对RBF-PID算法参数自适应调整,缩短系统动态平衡时间的同时具有智能性。实验表明该驱动电源具有输出精度高(<0.1%),稳定性强(0.05%),纹波系数低(<1uA),动态响应时间快,抗干扰能力强等优点。

Abstract:

A multiplex selector switch and a multiplex analog switch are chosen to realize the switching of photodiode PD and avalanche photodiode APD under multiple channels, and by setting the DAC digital-to-analog converter chip, in order to test the reliability of multiple laser diodes, achieve time-sharing operation, and reduce the size of the driver circuit. A continuous drive power circuit that can drive multiple channels of various laser diodes is produced by configuring the DAC digital-to-analog converter chip with varying operating point voltages. The software design introduces the reinforcement learning Actor-Critic framework for adaptive adjustment of the RBF-PID algorithm parameters to shorten the system dynamic balancing time while having intelligence; the system has deep negative feedback, which is used in the circuit design to improve the stability of the system and the design of dual OPA and MOS tubes to further reduce the deviation caused by leakage current and optimize the voltage-current linearity. The results of the studies demonstrate the benefits of the drive power supply, including its high output precision (<0.1%), high stability (0.05%), low ripple coefficient (<1uA), quick dynamic reaction time, and strong anti-interference ability.