摘要
设计了一种经济实用的半导体激光器驱动电源,具有自动电流控制(ACC)和自动功率控制(APC)两种控制方式。ACC控制利用电流采样反馈,从而使电流漂移最小、LD输出稳定性最大。APC控制利用内接受光二极管,将其监测电流通过反馈网络与设定值比较,形成闭环负反馈控制。设计中采用纯积分环节作为驱动调节器,避免了系统超调和振荡,又由于积分调节器具有滞后特性,利用此特点,实现了激光器的慢启动。温控电路采用比例积分调节器,通过半导体制冷器,使激光器工作在恒温状态下,同时引入积分分离思想,进而抑制积分饱和。实验结果表明,该系统驱动电流的稳定度为满量程的±0.05%,温度稳定度为±0.1℃。
An economical and practical laser diode （LD） driver was designed. The driver adopted two kinds of control modes which are automatic current control （ACC） and automatic power control （APC）. ACC makes use of current-sampling feedback to realize the minimum current drift and maximum output stability. APC uses the photodiode inside LD and compares its testing current with setting value to form a closed loop negative feedback. Pure integral unit was adopted as driving adjustor to avoid overstep and oscillation of system. Furthermore, integral adjustor has the feature of hysteresis, by which the system realized slowly-start. Temperature control was realized by PI adjustor based on semiconductor cooler. At the same time,integral separation was introduced to inhibit integral saturation. Experimental results show that the stability of driving current is ±0.05 % for full range and the temperature stability is ±0.1℃.
出处
《应用激光》
CSCD
北大核心
2010年第3期214-218,共5页
Applied Laser
