Waves of Current Conversion Circuit Based on Actual Circuit Models

Through experiment,the reasons are analyzed why the current turns negative when 3 SCRs are all off in three-phase half-wave rectified circuit and the resonance takes place during swit-ching period in three-phase half-wave active inverse circuit.The equivalent circuit models of the related devices cared are established to take the place of the ideal models to simulate the operation of the experiment.The simulation results with the improved models verify the validity of the theory.The essentials of the distribution parameters of high frequency model in the normal frequency circuit are proposed.The simulation models should be perfected to improve the accuracy of the results.