TZ-Source Inverters

Minh-Khai Nguyen; Young-Cheol Lim; Yi-gon Kim,

Industrial Electronics, IEEE Transactions on , vol.60, no.12, pp.5686,5695, Dec. 2013

doi: 10.1109/TIE.2012.2229678

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A new family of single-stage high-step-up boost voltage inverters based on transformers is proposed, called TZ-source inverters. By replacing two inductors in the classical Z-source inverter with two transformers, the proposed inverter produces a very high boost voltage gain when the turn ratio of the transformers is larger than 1. Compared to the trans-Z-source inverters, the proposed TZ-source inverter uses a lower transformer turn ratio, which reduces the transformer’s size and weight while producing the same output voltage gain. The extension of the proposed inverter topology to dc-link-type and embedded-type topologies is presented. The operating principles, analysis, and simulation results are shown. To verify the performance of the proposed TZ-source inverter, a laboratory prototype was constructed and operated with 60-V dc input. The simulation and experimental results verified that the converter has high-step-up inversion ability.

Index Terms—Boost inversion ability, embedded-Z-source inverter, quasi-Z-source inverter (qZSI), shoot-through state, single-stage boost inverter, transformer, Z-source inverter (ZSI).