针对半导体激光器(LD)的驱动特性,设计了一种基于开关电源的LD驱动电路。利用电源控制芯片TL494实现了LD的恒流驱动和过压保护,通过对输出光功率的检测实现了光功率的自动补偿功能。实验表明,该驱动电路具有低纹波系数、高效率和光功率补偿功能,光功率输出稳定度优于0.5%,可满足LD实际工作的需要。 Aiming at the driving characteristics of semiconductor laser (LD), an LD driving circuit based on switching power supply is designed. The use of power control chip TL494 LD constant current drive and overvoltage protection, through the detection of the output optical power to achieve automatic optical power compensation. Experiments show that the driving circuit has a low ripple coefficient, high efficiency and optical power compensation, optical power output stability is better than 0.5%, which can meet the needs of LD practical work.