摘要
介绍了激光二极管脉冲驱动源的控制技术。采用单片机与可编程逻辑器件实现电流脉冲宽度脉冲频率的调节;通过误差反馈和驱动电压叠加实现脉冲恒流控制。运用两点校正法分段拟合MOSFET门极驱动电压与LD电流对应关系曲线,单片机依据曲线修正驱动电压值,对温度引起的LD电流变化进行补偿。实验结果表明采用此方式获得的电流脉冲波形优于采用PID控制方法的实验波形。该方法具有温度补偿功能,在温度变化时输出电流稳定。
The control technique of LD-pumped pulse laser driver is introduced. The adjustments of current pulse width and frequency are achieved by using SMC and CPLD. The pulse constant current is achieved by adding the error feedback signal to the driving voltage. Two points＇ correction is used to fit the curve of MOSFET VGS to Io. According to this curve, the SMC modifies the value of driving voltage to compensate the current caused by the change of temperature. The experiment result shows that the current pulse achieved using this technique excels which using PID method. And this method can compensate the variation of temperature. It can output constant current when environment temperature is changed.
出处
《激光与红外》
CAS
CSCD
北大核心
2008年第3期216-218,共3页
Laser & Infrared
关键词
激光二极管
脉冲恒流
温度补偿
LD
pulse constant current
temperature compensate
