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In this paper, the effect of carrier waveform variations on inverter output voltage in multilevel inverters is examined. For this aim, carrier waveforms with various frequency and amplitude are constructed and compared with the reference sinusoidal signals. The obtained PWM waveforms are then applied to the power switches of the inverter. A five-level inverter prototype implemented and the real-time signals are produced using dSPACE DS1103 controller board and software's. The proposed multilevel sinusoidal PWM (SPWM) strategy is tested experimentally and the results obtained are presented. [ABSTRACT FROM AUTHOR]

In this paper, a sliding mode controller is designed for active shaping of the input current in the boost converter. Robustness of the designed controller is tested with variable output voltage references, different loads and network voltage variations. For the simulations, MATLAB/Simulink programme is used. From simulation results, the same phase was provided between input current and input voltage and nearly unity power factor was obtained. [ABSTRACT FROM AUTHOR]