为了提高气溶胶激光雷达(ALD)的测量精准度,设计一套模拟光源来校准ALD的接收系统.将BUCK电路和嵌入式控制系统相结合,提出了 一种高准确性、低功耗的ALD校准光源调节控制技术.首先,设计了 LED光源的控制系统和LED恒流驱动的控制电路结构;其次,根据继电反馈控制和Ziegler-Nichols(Z-N)法设计了 LED工作电流的比例、积分和微分(PID)自整定算法;最后,通过实验验证了控制电路具有低功耗、高准确性的特点.
To effectively improve the measurement accuracy of aerosol lidar(ALD),a set of simulated light source needs to be designed to calibrate the receiver system of ALD.In this paper,a high-accuracy and low-power regulation control technique was proposed,which integrates a BUCK circuit and an embed-ded control system for regulating the calibration light source of ALD.First,the control system of the LED light source and the control circuit structure of the LED constant current driver were designed;secondly,the proportional-integral-derivative(PID)autotuning algorithm for the LED operating current was de-signed,according to relay feedback control and the Ziegler-Nichols(Z-N)method;finally,the control circuit was experimentally verified to exhibit low-power and high-accuracy characteristics.