Family of high-boost Z-source inverters with combined switched-inductor and transformer cells

Nguyen, M.-K. ; Lim, Y.-C. ; Park, S.-J. ; Shin, D.-S.

Power Electronics, IET , vol.6, no.6, pp.1175,1187, July 2013
doi: 10.1049/iet-pel.2013.0033

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Abstract

This study proposes a new family of high-boost Z-source inverters (ZSIs) with combined switched-inductor and transformer cells. By changing the transformer turn ratio, the number of switched-inductor cells and shoot-through duty cycle, the proposed inverter produces high voltage gain. Compared with the conventional high-boost ZSI topologies for the same input and output voltage, the proposed inverter uses a higher modulation index to improve the output waveform. An alternatecascaded technique is applied to the proposed inverter to distribute the stresses on the passive components. This study presents the operating principles and analysis. To verify the performance of the proposed inverter, simulation and experimental results are shown with various transformer turn ratios.