高精度半导体激光器恒流恒温驱动电路设计  

Design of High Precision Constant Current and Constant Temperature Driving Circuit for Semiconductor Laser

作　　者：苏浩 朱学华 刘闯闯 Su Hao;Zhu Xuehua;Liu Chuangchuang(Key Laboratory of Advanced Perception and Intelligent Control of High-end Equipment,Ministry of Education,Wuhu,Anhui 241000,China;School of Electrical Engineering,Anhui Polytechnic University,Wuhu,Anhui241000,China)

机构地区：[1]高端装备先进感知与智能控制教育部重点实验室,安徽芜湖241000 [2]安徽工程大学电气工程学院,安徽芜湖241000

出　　处：《应用激光》2022年第8期139-148,共10页Applied Laser

基　　金：安徽高校自然科学研究重点项目(KJ2020A0347);光电材料科学与技术安徽省重点实验室开放课题(OMST201903)。

摘　　要：半导体激光器在工业、医疗、科研、信息和军事等多个领域有着广泛的应用。由于工作温度和驱动电流的微小变化会引起半导体激光器输出波长和功率发生显著改变,因此研制了一种高稳定性的半导体激光器恒温恒流驱动电源。该电源利用场效应管和运算放大器组成闭环恒流控制系统,为激光器提供高精度和高稳定的静态输入电流;设计了慢启动电路,消除电源动态启动时可能出现的尖峰和过冲,对半导体激光器起到保护作用。使用MAX1978芯片对热敏电阻采集的实时工作温度与预设温度的偏差进行PID运算,控制TEC制冷或制热来实现半导体激光器工作温度的长期稳定。测试结果表明,该电源输出电流0~100 mA连续可调、电流精度小于0.01 mA,温度控制精度达到0.01℃,并实现输出功率的长期稳定,具有实时调节性能好、成本低、易实现等特点。Semiconductor lasers are widely used in many fields,such as industry,medical treatment,scientific research,information,and military.Because the output wavelength and power of semiconductor laser will change significantly when the working temperature of semiconductor laser changes slightly,a high stability constant temperature and constant current driving power supply for semiconductor laser is developed in this paper.A constant current source consist of a field effect transistor and an operational amplifier is used for providing a high-precision and high-stability input current for that laser;a slow starting circuit is designed to protect the semiconductor laser and avoid the damage to the semiconductor laser caused by the peak and overshoot of the output current waveform of the power supply during starting.The MAX1978 chip is used to perform PID operation on the deviation between the real-time working temperature collected by the thermistor and the preset temperature,and the TEC is controlled to refrigerate or heat so as to realize the long-term stability of the working temperature of the semiconductor laser.The test results show that the output current of the power supply is continuously adjustable from 0 to 100 mA,the current accuracy is 0.01 mA,the control temperature accuracy is 0.01℃,and the power is stable for a long time.The power supply has the characteristics of good real-time adjustment performance,low cost,and easy implementation.

关 键 词：半导体激光器 恒流驱动 限流保护 恒温控制 

分 类 号：TN248.4[电子电信—物理电子学]