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脉冲激光雷达探测的性能直接与激光束的质量和能量有关,而激光驱动电路则直接决定了脉冲激光的功率和脉冲宽度。基于半导体激光雷达探测系统的要求,设计出应用于激光雷达发射系统的大电流纳秒级脉冲半导体激光二极管的驱动电路。介绍了电路的系统结构和驱动级电路的模型及其理论分析,推导其电流数学模型计算公式,并对关键器件的选择进行了总结;运用SPICE仿真程序对驱动电路进行了仿真。制作了印刷电路板,得到峰值电流25A,脉宽15ns的脉冲电流,满足设计要求。
The performance of pulsed lidar is directly related to the quality and energy of the laser beam, while the laser driving circuit directly determines the power and pulse width of the pulsed laser. Based on the requirements of the semiconductor laser radar detection system, a drive circuit of a large current nanosecond pulse semiconductor laser diode for laser radar emission system is designed. The system structure of the circuit, the model of the driver stage circuit and its theoretical analysis are introduced. The formulas for calculating the current mathematical model are deduced. The selection of the key devices is summarized. The driving circuit is simulated by the SPICE simulation program. Produced a printed circuit board, get the peak current of 25A, pulse width of 15ns pulse current to meet the design requirements.