Research And Design Of Inverter Power Supply In Switch Cabinet For Maglev Line

Electric drive technology plays an important role in the modernization. With the development of electronic technology, AC drive system with its unique advantages is gradually replacing traditional DC drive system to play an increasingly important role in the field of electric drive. Electric railyway switch which uses three-phase AC induction motor as the power output, plays a vital role in the safe operation of rail transit.In this dissertation, starting from the engineering practice, while based on the laboratory's own technology needs, the research focuses on a three-phase AC power system based on TMS320F2812. Firstly, by defining the design requirements, the overall structure of power system and the functional part of the circuit are set out. Secondly, some features of the circuit design process are introduced. The thesis details the auxiliary power supply circuit controlled by UC3842, the step-up BOOST circuit based on SG3525, three-phase full-bridge inverter main circuit and its driver circuit.The inverter control circuit and the protection circuit based on TMS320F281 are also discussed. The principle of their work on the theoretical analysis and the formula is derived, and some of the major components of the selection and design parameters are described.Based on the discussion on various VVVF control methods, the dissertation focuses on V/f control mode, as well as the principle of SVPWM technology and their programming approach. In this dissertation, the main program, SVPWM program and protecion program as well as their program flow charts are presented. Finally, set-up circuit, DSP control circuit, three-phase inverter circuit are tested. The experimental waveforms and analysis verify the feasibility and rationality of the design.