Proceedings of the KIEE Conference (대한전기학회:학술대회논문집)

The Korean Institute of Electrical Engineers (대한전기학회)
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A study on the adjusting output energy of the CO2 laser controlled directly in AC power line

상용전원을 제어하는 CO2레이저의 출력 조절에 관한 연구

  • Jeong, Jong-Jin (Department of Electrical Engineering, Pusan National University) ;
  • Lee, Im-Geun (Department of Electrical Engineering, Pusan National University) ;
  • Choi, Jin-Young (Department of Electrical Engineering, Pusan National University) ;
  • Park, Sung-Jin (Department of Electrical Engineering, Pusan National University) ;
  • Song, Gun-Ju (Department of Electrical Engineering, Pusan National University) ;
  • Kim, Hee-Je (Department of Electrical Engineering, Pusan National University)
  • 정종진 (부산대학교 전기공학과) ;
  • 이임근 (부산대학교 전기공학과) ;
  • ;
  • 박성진 (부산대학교 전기공학과) ;
  • ;
  • 김희제 (부산대학교 전기공학과)
  • Published : 2005.07.18
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Abstract

We demonstrate a simple CO2 laser by controlling firing angle of a TRIAC switch in ac power line. The power supply for our laser system switches the voltage of the AC power line (60Hz) directly. The power supply does not need elements such as a rectifier bridge, energy-storage capacitors, or a current-limiting resistor in the discharge circuit. In order to control the laser output power, the pulse repetition rate is adjusted up to 60Hz and the firing angle of TRIAC gate is varied from 45 to 135. A ZCS(Zero Crossing Switch) circuit and a PIC one-chip microprocessor are used to control the gate signal of the TRIAC precisely. The maximum laser output of 40W is obtained at a total pressure of 18Torr, a pulse repetition rate of 60Hz, and a TRAIC gate firing angle of 90.

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