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The Scientific World Journal
Volume 2014, Article ID 539297, 8 pages
http://dx.doi.org/10.1155/2014/539297
Research Article

A Single-Phase Embedded Z-Source DC-AC Inverter

Department of Electrical Engineering, Chonnam National University, Gwangju 500-757, Republic of Korea

Received 21 January 2014; Revised 17 June 2014; Accepted 22 June 2014; Published 16 July 2014

Academic Editor: Christoph Grimm

Copyright © 2014 Se-Jin Kim and Young-Cheol Lim. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

In the conventional DC-AC inverter consisting of two DC-DC converters with unipolar output capacitors, the output capacitor voltages of the DC-DC converters must be higher than the DC input voltage. To overcome this weakness, this paper proposes a single-phase DC-AC inverter consisting of two embedded Z-source converters with bipolar output capacitors. The proposed inverter is composed of two embedded Z-source converters with a common DC source and output AC load. Though the output capacitor voltages of the converters are relatively low compared to those of a conventional inverter, an equivalent level of AC output voltages can be obtained. Moreover, by controlling the output capacitor voltages asymmetrically, the AC output voltage of the proposed inverter can be higher than the DC input voltage. To verify the validity of the proposed inverter, experiments were performed with a DC source voltage of 38 V. By controlling the output capacitor voltages of the converters symmetrically or asymmetrically, the proposed inverter can produce sinusoidal AC output voltages. The experiments show that efficiencies of up to 95% and 97% can be achieved with the proposed inverter using symmetric and asymmetric control, respectively.