第18卷第7期 2010年7月
文章编号
1004-924X(2010)07-1629-08
光学精密工程
Optics and Precision Engineering
Vol.18No. 7
Jul.2010
控制半导体激光器的高稳定度数字化驱动电源的设计
丛梦龙，李黎，崔艳松，张真寒，王一丁
（吉林大学电子科学与工程学院集成光电子学国家重点联合实验室，吉林长春130012）
摘要：以TMS320F28335为控制核心，设计了一种用于驱动半导体激光器的数控电流源。电源的外围电路包括指示灯模块、语音模块、LCD模块以及键盘控制模块。语音与指示灯模块负责系统工作状态提示，LCD负责显示实际电流以及目标电流，键盘模块负责电源的启动、关闭、电流设置、电流步进等操作。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MOS管进一步减小漏电流引起的偏差（小于0.5%)，优化了电压一电流线性度；软件设计中采用了 PID算法缩短了系统的动态平衡时间；系统具有完备的保护措施，如防上电/断电冲击保护电路、延时软启动电路、过流保护电路以及纹波抑制电路，保证了激光器稳定可靠地工作，在激光器的驱动测试过程中，激光器工作状态稳定，中心波长未出现漂移，驱动电流无毛刺出现。
关键词：率导体激光器；驱动电源；负反馈；恒流源；电流补偿；保护电路
中图分类号：TN248.4
文献标识码：A
doi:10.3788/OPE.20101807.1629
Design of high stability digital control driving system for semiconductor laser
CONG Meng-long, LI Li, CUI Yan-song, ZHANG Zhen-qian, WANG Yi-ding(StateKey Laboratory on Integrated Optoelectronics,College of Electronic ScienceandEngineering,JilinUniversity,Changchun 130012,China)
Abstract: A digital control current supply is designed for driving semiconductor lasers by taking the TMS32oF28335 as a control center,which consists of a guiding light module,a phonetic module,a liquid-crys tal display(LCD) module and a keyboard module. The phonetic module and light module are responsible for prompting the working condition of the system,the LCD is used to show the actual current and setting cur-rent,and the keyboard module is taken to control the start-up, turn-off, current setting and current adjust-ment. In circuit design,the deep feedback theory is researched to greatly enhance the stability and two MOS FET are designed to neutralize their own leakage current, decrease the current deviation(less than 0. 5%) and optimize the linear dependence between voltage and current, In software design, the PID algorithm is em ployed to shorten the time to establish dynamic equilibrium for the system. The system can provide complete protective measures, such as surge-prevent, power on/off-prevent, time delay soft start, over current protec-tion for ensuring the LD to work stably and reliably. During the driving test, the LD can work in a steady state without center wavelength drifting and driving current fluctuation.
Key words: semiconductor laser; driving circuit; negative feedback; constant-current source; current
compensation;protection circuit
收稿日期：2009-09-08；修订日期：2009-09-30
基金项目：国家863高技术研究与发展计划资助项目（No，2009AA03Z442)；吉林省科技厅基金资助项目（No.
20090422)