Simulation Study Of Multi-function Power Inverter

Firstly, the application and development trend of simulation theory in arc welding inverter power source is expounded, and some questions which should be paid attention to are discussed. Some common simulated software is introduced, such as Pspice, Saber and MATLAB. Taking into account the characteristic and appropriate range of three simulated software, MATLAB is selected to simulate multi-function inverter power source.The work process of Multi-function inverter power source is analyzed, configuration of the main circuit is designed, and parameters of the circuit component are calculated. Then the simulation model of the system is developed on the basis of that, and the U-I static characteristic is simulated; The transfer function of the control circuit is educed, and the stability of system is analyzed. Second, DC TIG welding, DC pulse TIG welding, AC square-wave TIG welding and variable polarity AC TIG welding are simulated. At last, waveform of multi-function inverter power source is tested using Tektronix data storage oscillograph, and U-I static characteristic curve is measured on static load condition, afterwards, contrasting the former with the result of the simulation, they are very resembled and closed. And the veracity of designed parameters is validated, and expected purpose is obtained.In addition, aiming at the shortage of the hard-switching power source (the power switching endures circuit stress and voltage stress at the moment of turning on and off, and switching process has great waste), theory of the full bridge phase shifting zero voltage switching inverter (FB-ZVS-PWM) is introduced. Based on MATLAB, the optimal resonant inductance and capacitance parameters are schemed out, and design cycle of soft-switching power source is shorten.