A Review on Dead-Time Effects in PWM Inverters and Various Elimination Techniques

Abstract

Abstract-- Dead-time is necessary to prevent the short circuit of the power supply in PWM Inverters or converters. But, it will result in output voltage deviations and in case of lower values of current, lower order harmonics will be taken into account. So, dead-time elimination is required in all PWM Inverters or converters. This paper is dealing with a summary of dead-time effects in PWM inverters and various methodologies proposed for eliminating the dead-time and improving the R.M.S value of the output voltage and removing the harmonics concurrently. In case of three phase inverters, the dead-time effect is similar to that of single phase VSI.The waveforms for the analysis of the dead time effect are based on the leg of an inverter, using IGBT'S as switching device (Fig. 2)