| Transversely Excited Atmospheric (TEA) CO2 laser is characterized by high efficiency, good beam quality and high averaged power and has attracted the attention in industrial, aerospace and military application. The capacitor charging power supply (CCPS) qualified as high charging speed, high power and high efficiency is a key factor in high power TEA CO2 laser. Formerly, industrial frequency CCPS was usually used, but it has these disadvantages: large and heavy, less accuracy and severe interference to power system. With the development of power electronics, constant current series resonant CCPS, which has compact structure, low energy consumption, and strong load short-circuit withstand ability, gradually supersedes the traditional power supply. And as digital technology is developing, digital control device is gradually applied in CCPS.At the beginning of the thesis, several kinds of CCPS are listed, and their working principle, characteristic and differences are introduced. Then the mechanism of full bridge series resonant power supply is thoroughly analyzed, and equivalent circuit and mathematical model are given. Based on the equivalent circuit and its mathematical model, the time response of the charging voltage and current for the power capacitor of the series resonant inverter is calculated and concluded. The conclusions are verified by simulating the series resonant circuit using PSpice 10.5.Based on the above analysis, a design routine for the series resonant inverter of laser power supply is proposed with the charging voltage and power as the constraint, and an example is illustrated.After the analysis of an analog control board for CCPS of TEA laser, a digital control board using DSP TMS320LF2407A is implemented to improve the performance of the CCPS. The design routine is detailed expatiated, and the result is analyzed and estimated in contrast to analog control board. At the end, the suggestion for further development of the digital controlled CCPS is provided. |
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