大功率光纤激光器泵浦源LD驱动电源设计

Design of Laser Diode Driving Power Supply for High Power Fiber Laser Pumping Source

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 highpower and low noise, as well as the analysis of laser diode（LD） operation function and output characteristics, a LDdriving control circuit with high speed micro-computer unit ADuc842 as the main control chip is designed. Automat-ic current control（ACC） and automatic temperature control（ATC） are used in the design to realize constant currentsource 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-interfer-ence ability and operation stability. Experimental results show that output current stability error is better than 0.5%and temperature stability error is ±0.1 ℃.