Research On Driving Technology Of High Power Semiconductor Laser

In recent years,with the continuous expansion of the modern industrialization process,high-power semiconductor laser systems have many advantages such as light weight,high efficiency,small size,high reliability,and long service life.The application of high-power semiconductor laser systems has gradually penetrated many fields such as industrial production,medical treatment,national defense security,and scientific research.A high-power semiconductor laser drive system is typically made up of two components: a main power supply system and a thermoelectric cooler(TEC)temperature-controlled power supply system.According to actual needs,this paper designs and implements a high-efficiency,low-ripple,high-power semiconductor laser drive power supply system with strong anti-interference capability.It aims to increase the system’s flexibility in practical applications,meet the needs of various working environments and tasks,and extend the service life of high-power semiconductor laser systems.This thesis focuses on three aspects of the high power semiconductor laser drive system:theoretical parameter design,simulation,and experiment.Theoretical parameter design: First,research and analysis of high-power semiconductor laser load characteristics,mathematical modeling of semiconductor lasers and construction of a high-power semiconductor laser equivalent load model.After that,the mathematical model of the main power topology full-bridge LCC resonant converter’s topology is established.The nonlinear term in the mathematical model is then approximated using the extended function description method,and various resonance parameters and output are then investigated and analyzed.A resonance parameter design approach is suggested in respect to the link between voltage and current gain.Next,research and evaluate the benefits and drawbacks of frequency conversion control,phase shift control,and frequency conversion phase shift composite control strategies.Based on this,the advantages and disadvantages of the PID algorithm are studied and analyzed,and a linear active disturbance rejection control(LADRC)algorithm is proposed to improve the system’s anti-interference ability and reduce output current ripple.Finally,the TEC device is used to achieve temperature control of the high-power semiconductor laser,which prevents temperature-related damage to the high-power semiconductor laser system.In the simulation and experiment,first and foremost,the performance simulation of the full-bridge LCC resonant converter is realized along with the simulation model of the main power supply and equivalent load of the high-power semiconductor laser created using Matlab/Simulink.Second,based on the simulation results,the high-power semiconductor laser drive power supply’s parameter design,device selection,and programming were finished,and an experimental platform for the high-power semiconductor laser drive system was constructed.He final simulation and experimental results show that the system can constantly adjust the output current in the 0–40A range,the output current ripple is less than 0.8%,and the operating efficiency can reach up to 92%.This system not only achieves zero voltage switch(ZVS)conduction and suppresses current ripple,but it also significantly lowers the MOS transistor conduction loss.Also,it is possible to prevent output current instability brought on by variables such changes in circuit parasitic parameter values,load disturbance,and system input voltage.In general,the high-power semiconductor laser drive system has many advantages,including high stability,low ripple,high efficiency,low cost,and good robustness.