New transformer less step up/step down dc-ac converter

Abstract

This paper introduces a new transformer less dc-ac converter with the feature that it produces an instantaneous output voltage higher or lower than the input dc voltage. The topology has two switching cells, well known dynamic response, does not have transformer or power conversion stage that saves us mass, losses, and volume of a transformer. The advantages of step up dcac converter includes system reliability, reduction of size of components and there by acquiring less mass for the whole converter. The advantages of buck-boost dc-ac converter is also available when switching cells are used instead of a transformer, is introduced. Current control takes the advantage of circuit protection from disturbance (fault). This technique can provide fast dynamic response, robust Performance. The current control of step up/step down dc-ac converter is easy to implement and provides high accuracy. The validity and performance of the discussed topology are verified by simulation using Matlab/simulink software.