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

© The Institution of Engineering and Technology
Received 15/01/2013, Accepted 29/03/2013, Revised 08/03/2013, Published

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 alternate-cascaded 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.

Inspec keywords: power transformers; inductors; switching convertors; invertors

Other keywords: boost Z-source inverter; transformer cells; switched inductor cell; alternate cascaded technique; passive components; ZSI topology; shoot through duty cycle; transformer turn ratio; modulation index; stress distribution

Subjects: Power convertors and power supplies to apparatus; Inductors and transformers; Power electronics, supply and supervisory circuits

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