Simplified power supply for long pulse CO2 laser using zero cross switching technique
✍ Scribed by Hyun-Ju Chung; Dong-Hoon Lee; Do-Wan Kim; Sung-Joon Park; Yu-Soo Lee; Jung-Hwan Hong; Joong-Mann Kim; Hee-Je Kim
- Publisher
- Elsevier Science
- Year
- 2001
- Tongue
- English
- Weight
- 231 KB
- Volume
- 33
- Category
- Article
- ISSN
- 0030-3992
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✦ Synopsis
We propose a simple power supply for a longitudinally pulsed CO2 laser with long pulse duration by the switching control of AC line (60 Hz) on HV leakage transformer primary, which can generate long pulse of about 3 ms compared to a typical pulsed power supply. In this power supply, a low voltage open loop control for high voltage discharge circuit is employed to avoid the HV sampling or switching, and AC line voltage switched directly by a SCR is applied to the leakage transformer primary. Thus, there is no need of a rectiÿed bridge and an energy-storage capacitor in the discharge circuit, and the leakage transformer allows one to omit a current-limiting resistor. In order to control the laser output power, the pulse repetition rate is adjusted up to 60 Hz. A ZCS circuit and a PIC one-chip microprocessor are used to control the gate signal of SCR precisely.