Method for controlling laser power supply energy based on DSP (Digital Signal Processor)

The invention discloses a CO2 laser power supply intelligent controller developed based on a digital signal processor (DSP) TMS320LF2410. The quickness and the stability of laser energy can be realized by adopting a method of glow start constant-voltage control and work constant-current control. The invention provides an on-line discrimination method for laser power supply idle load, laser tube damage and other abnormal conditions and a drive signal isolating interlocking circuit aiming at the potential hazard for intervening and causing the straightway of a bridge type circuit. The inventionhas the advantages that: the laser output energy can be quickly and accurately stabilized by adopting the DSP to carry out constant-voltage and constant-current control on the laser power supply; thestraightway of an upper bridge arm and a lower bridge arm at abnormal state can be effectively avoided by directly using control signals of MOSFET (Metal-Oxide -Semiconductor Field Effect Transistor)tube grid electrodes of the upper bridge arm and the lower bridge arm as an interlocking signal source; and the laser source idle load, the damage of the laser tube and other abnormal conditions can be identified on line and the work of the power supply can be instantly stopped when the CO2 laser source is in open circuit and the damage of the laser tube and other abnormal conditions generate, thereby the phenomenon that the power supply is burnt down because the high voltage cannot be discharged in time can be effectively avoided.