An enhanced pulse-based dead-time compensation technique for PWM-VSI drives

Abstract

A dead-time delay is imperative in pulse width modulated (PWM) voltage source inverters in order to prevent a shoot through in the DC link. This delay causes the dead time effect and it results in output waveform distortions. This leads to various undesired characteristics. A simple yet an accurate pulse based dead time compensation technique is presented in this paper which compensates the dead time effect accurately without any phase delays at the output. Proposed method is developed by analyzing both magnitude and phase distortions in a pulse by pulse manner. Simulation results of the proposed method are provided in order to verify the validity of the method.