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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℃。
A kind of economical and practical semiconductor laser drive power supply is designed. There are two kinds of control modes: Automatic Current Control (ACC) and Automatic Power Control (APC). ACC control uses current sampling feedback to minimize current drift and maximize LD output stability. APC control the use of internal light-emitting diode, the monitoring current through the feedback network and the set value compared to form a closed-loop negative feedback control. In the design, the pure integral part is used as the driving regulator to avoid overshooting and oscillation of the system, and because of the hysteresis characteristic of the integral regulator, the slow start of the laser is realized by utilizing the characteristic. Temperature control circuit uses a proportional integral regulator, through the semiconductor cooler, so that the laser work at a constant temperature, while introducing the idea of integral separation, and then suppress the integral saturation. Experimental results show that the system drive current stability of ± 0.05% of full scale, the temperature stability of ± 0.1 ℃.