Simplified power supply for long pulse CO2 laser using zero cross switching technique |
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Authors: | Hyun-Ju Chung Dong-Hoon Lee Do-Wan Kim Sung-Joon Park Yu-Soo Lee Jung-Hwan Hong Joong-Mann Kim Hee-Je Kim |
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Affiliation: | Department of Electrical Engineering, Pusan National University, 30, Changjeon-Dong, Keumjeong-Ku, Pusan, 609-735, South Korea |
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Abstract: | 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 rectified 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. |
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Keywords: | Pulsed CO2 laser Leakage transformer Open loop control Long pulse ZCS circuit |
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