| Title |
Minimization of a CW CO2 Laser Output Ripple by using High Frequency Resonance Phenomena |
| Authors |
사쿠라(Sikander, Sakura) ; 권민재(Kwon, Min-Jae) ; 김희제(Kim, Hee-Je) ; 이동길(Lee, Dong-Gil) ; 허국성(Xu, Guo-Cheng) |
| DOI |
https://doi.org/10.5370/KIEE.2013.62.6.798 |
| Keywords |
CW CO2 laser ; Output ripple ; Cockcroft-Walton circuit ; Half-bridge ; Resonance converter |
| Abstract |
In a conventional DC power supply used for CO2 laser, the circuit elements such as a rectifier bridge, a current-limiting resistor, a high voltage switch, energy storage capacitors ans a high-voltage isolation transformer using high turn ratio are necessary. Consequently, those supplies are expensive and require a large space. Thus, laser resonator and power supply should be optimally designed. In this paper, we propose a new power supply using high frequency resonance phenomena for CW(Continuous wave) CO2 laser (maximum output of 23W with discharge length of 450mm). It consists of a transformer including leakage inductance, magnetizing inductance and half-bridge converter, a three-stage Cockcroft-Walton and PFC(Power factor correction) circuit. The output ripple voltage can be controlled the minimum of 0.24% under the high frequency switching of 231kHz. Furthermore, the output efficiency was improved to 16.4% and the laser output stability of about 5.6% was obtained in this laser system. |