Varying the switching frequency to compensate the dead-time in pulse width modulated voltage source inverters

This paper proposes a technique to compensate the effects of the dead-time in pulse width modulated voltage source inverters. In the technique, the switching frequency is modified to avoid infeasible pulse widths of the gating signals. The switching frequency is varied to minimize the total harmonic distortion of the inverter output voltage. The experimental results obtained with the proposed technique employed in a three-phase induction motor drive system are presented.