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Abstract
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In this paper, a novel cascaded transformer multilevel inverter is proposed. The number
of the switching devices is reduced in the proposed topology. This topology comprises of a
DC source, several single phase low-frequency transformers, two main power switches and some
bidirectional switching devices. In this topology, only one bidirectional switch is employed for
each transformer. However, in conventional cascaded transformer multilevel inverter, four
switching devices are required for each transformer. Therefore, more output voltage levels
can be obtained using fewer switching components. Reduction in the number of switching
devices which also means reduction in the number of gate drivers results in smaller size and
low implementation cost. Switching power losses are also reduced in this topology. Selective
harmonic elimination (SHE) technique is applied to the proposed inverter to obtain a high quality
output voltage. Simulation and experimental results are also provided to verify the feasibility
of the proposed converter.
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