Research And Development Of Control System For High Power Diode Laser Based On PLC

The high power diode laser is thought of as the transistors substitute for electronic tubes in middle of the twentieth century, which can bring about a new revolution to laser technology and laser manufacture, and will be a development tendency of future laser. High-power diode laser as a new laser source, has extremely broad application prospect. The content of the paper is to research and develop a control system of industrial kilowatt-level high power diode laser.The paper introduces the research and development process of the high-power diode laser control system based on Programmable Logic Controller (PLC). It also introduces the work principle and configuration of the control system. It mainly elaborates four aspects: design of systemic general planning, design of systemic hardware, design of systemic software, and debug of systemic hardware and software. The paper first introduces the systemic general planning: the control system, which takes S7-300 PLC as its core control unit, is composed of PLC, on-off power supply, intelligent sensors, and guidance panel. Through introducing cell configuration and work principle of PLC, the design of systemic hardware framework is completed according to desired control function. The control system software contains the main program, the cooling water parameters detection subprogram, the laser power control subprogram, and the human machine interface subprogram. The debug of systemic hardware and software main includes debug of systemic software and debug of systemic hardware, and the analysis and research of reliability measure taken to PLC control system, along with the grounding design.The control system of HPDL-4D01 high power diode laser, developed by the paper, has realized the integrated-control of both constant temperature hydrocooling system and laser power supply. Through touching the HMI, the laser output and output modes can be expediently and exactly controlled, and the temperature of cooling system can be set. It also can real-time monitor the working state of diode laser, which guarantees diode laser work at secure and steady state. The control system uses PLC with high-reliability and high efficiency to control, and adopts simple and visualized Ladder Diagram language to program, which guarantees the reliability of the control system, and also displayed the merit of small volume and light weight of diode laser to great degree.