Zahra Bayat - Islamic Azad University, Ahar,
Ebrahim Babaei - University of Tabriz, Tabriz, Iran

This paper propose a new topology for cascaded multilevel inverters. This structure consists of series connection of proposed basic unit blocks which are builtwith both unidirectional and bidirectional switches. The proposed structure has some advantages including: reduction in the number of switches and driver circuits,cost and installation area. Three algorithms for determination of dc voltage sources’ magnitudes have also been proposed. The algorithms can produce all odd andeven levels at the output voltage. The proposed structure also has fewer dc voltage sources variety and lessmaximum blocking voltage of switches compared to conventional inverters. The capability of proposed structure in producing all odd and even output voltage levels is proved by simulation result for a 21-level inverter

Multilevel inverters, symmetric multilevel, asymmetric multilevel