A CW CO2 laser using a high-voltage Dc–dc converter with resonant inverter and Cockroft–Walton multiplier |
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Authors: | Hyun-Ju Chung |
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Institution: | Department of EMI/EMC & Electromagnetics, Agency for Defense Development, P.O. Box 18 ChinHae, KyungNam 645-600, South Korea |
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Abstract: | I propose a high-voltage Dc–dc converter for a CW (continuous wave) CO2 laser system using a current resonant half-bridge inverter and a Cockcroft–Walton circuit. This high-voltage power supply includes a two-stage voltage multiplier driven by a regulated half-bridge series resonant inverter. The inverter drives a step-up transformer and the secondary transformer is applied to the voltage multiplier. It is highly efficient because of the reduced amount of switching losses by virtue of the current resonant half-bridge inverter, and also due to the small size, low parasitic capacitance in the transformer stage owing to the low number of winding turns of the step-up secondary transformer combined with the Cockroft–Walton circuit. I obtained a maximum laser output power of 44 W, a maximum system efficiency of over 16%, and the stability of laser output power of about 4.6% in this laser system. |
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Keywords: | CO2 laser Dc–dc converter ZCS half-bridge inverter Cockroft–Walton circuit |
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