Switch Ladder Modified H-Bridge Multilevel Inverter With Novel Pulse Width Modulation Technique

Abstract

It is difficult to make a structure of multilevel inverter for the efficient conversion of dc to ac having a smaller number of power electronic components, less switching losses, less voltage stress on switches, and a greater number of output voltage levels. To breakthrough this problem, a modification is performed in the existing H-bridge multilevel inverter to form a switch ladder modified H-bridge multilevel inverter (SLMHB-MLI). Moreover, for the minimization of maximum voltage rating on the switches and optimization of switching sequence of the multilevel inverter, a novel pulse width modulation (PWM) technique is proposed in this research. Furthermore, in SLMHB-MLI, the novel PWM technique is integrated with an ANDed PWM technique for the variation of output voltage magnitude. The usefulness of the proposed topology and PWM technique are confirmed via comparison with previous topologies simulation and experimentation, respectively.

Keywords

• ANDed and novel PWM techniques
• switch ladder multilevel inverter
• total harmonic distortion