Implementation of Switched-Coupled-Inductor DC–DC Step-Up Converter fed Induction motor drive Applications

Abstract

In this paper, a coupled inductor based high step-up dc–dc converter for high step-up Induction motor drive applications is proposed. The concept is to utilize two capacitors and one coupled inductor. The two capacitors are charged in parallel during the switch-off period and are discharged in series during the switch-on period by the energy stored in the coupled inductor to achieve a high step-up voltage gain. In addition, the energy stored in the coupled inductor is recycled; the voltage stress of the main switch is reduced. The switch with low resistance RDS (ON) can be adopted to reduce the conduction loss and the reverse-recovery problem of the diodes is alleviated. Not only lower conduction losses but also higher power conversion efficiency is benefited from lower turns ratios. The operating principle and steady-state analyses are discussed in detail. Induction motors have been used more in the industrial variable speed drive system. Bye using induction motor the frequency of the voltage is applied to the stator through power electronic devices, which allows the control of the speed of the motor. The operating principles and the steady-state analyses of the proposed converter are discussed in detail. The simulation results are obtained using MATLAB/SIMULINK software.