Research On High-Power Semiconductor Laser Driving Supply

Semiconductor laser is a kind of electro-optic converter with high conversion efficiency and convenient control method.It is widely used in industrial processing,communications medical treatment,defense and military industry and other fields.The power supply of semiconductor laser is responsible for driving,controlling and protecting the semiconductor laser.Its technical performance directly affects the light quality,reliability and service life of the semiconductor laser system.The conventional high-power semiconductor laser driving supplies generally use universal switching power supplies.The structure in which the load is connected in parallel to the output capacitor makes the load current ripple largely dependent on the load resistance.While the semiconductor laser is a load with very small on-state resistance,so this makes the traditional supplies not fully satisfy the low current ripple specifications which is required by semiconductor laser.The LCL filter,which is used more in the grid inverter,is introduced to the output stage of the phase shift full bridge converter to improve the output current ripple of the driving power supply and enhance the adaptability of the load.First,based on the requirements of the driving power,the overall design of a high-power semiconductor laser driver based on the ZVS Phase-Shift Full Bridge converter and the LCL filter is proposed.Then the basic theory of ZVS PSFB converter is studied,and its basic working principle and related characteristic analysis are studied.Then the mathematical model and control strategy of the LCL phase shift full bridge converter are analyzed,and the LCL parameter design method is studied.The closed loop stability criterion and the current regulator design method of the power supply system in digital control are studied.Then,the power supply scheme of high-power diode laser is simulated.The simulation shows that the ripple of the driving power supply meets the requirements and has good load adaptability.It is proved that the switch of the driving power can realize ZVS in a wide range of load current,thus having good efficiency.And the driving power has a good input characteristics is verified as well.Finally,the hardware design of high power semiconductor laser driver is studied,and the 9.5kW power supply experimental platform is built.The experiment proves that the output current ripple is basically in accordance with the theoretical design values under the existing filter and load conditions,and that the effectiveness of the design scheme of the experimental platform is verified and lays a foundation for the follow-up research.