根据大功率、低噪声半导体泵浦光纤激光器对于激光电源的要求, 通过LD工作原理和输出特性分析, 设计一种以 ADuc842高速单片机为主控芯片的LD驱动控制电路。设计采用自动电流控制(ACC)和自动温度控制(ATC)的方式, 实现LD的恒流源驱动和恒温控制。设计还引用了双限流电路、浪涌吸收电路及慢启动电路等一系列保护电路, 提高了LD的抗冲击能力和工作稳定性。实验结果表明, 电流输出稳定度优于[0.5%], 温度稳定度达到[±0.1℃] 。

According to the laser power supply requirements of semiconductor pumping fiber lasers with high power and low noise, as well as the analysis of laser diode (LD) operation function and output characteristics, a LD driving control circuit with high speed micro-computer unit ADuc842 as the main control chip is designed. Automatic current control (ACC) and automatic temperature control (ATC) are used in the design to realize constant current source driving and constant temperature control of LD. Protection circuits such as double current-limiting circuit, surge absorbing circuit and low speed starting circuit are adopted in the design so as to improve the anti-interference ability and operation stability. Experimental results show that output current stability error is better than 0.5% and temperature stability error is ±0.1 ℃.