| Title |
A Study on the Pulsed CO_2 Laser by the Switching Control of Leakage Transformer Primary |
| Authors |
정현주(Chung, Hyeon-Ju) ; 이동훈(Lee, Dong-Hoon) ; 김희제(Kim, Hee-Je) |
| Keywords |
Pulsed CO_2 laser ; High voltage pulse discharge ; Leakage transformer ; ZCS circiuit ; PIC one-chip microprocessor |
| Abstract |
We propose a pulsed CO_2laser below 30W by the AC(60Hz) switching control of leakage transformer primary which has some advantages of cost and size compared to a typical pulsed power supply. Pulse repetition rate is adjusted from 5 Hz to 60 to Hz control laser output. In this laser a low voltage open loop control for high voltage pulse discharge circuit is employed to aviod the Hv sampling or switching and high voltage leakage transformer is used to convert low voltage pulse rectified from AC to high voltage one. A ZCS(Zero Crossing Switch) circuit and a PIC(programble one-chip microprocessor are used to control gate signal of SCR precisely. The pulse repetition rate is limited by 60Hz due to the frequency of AC line and a high leadkage inductance. The maximum laser output was about 23 W at pulse repetition rate of 60Hz total gas mixture of CO_2 : N_2 : He=1: 9: 15 and total pressure of 18 Torr |