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A Novel Integrated Single-Phase Inverter With Auxiliary Step-Up Circuit for Low-Voltage Alternative Energy Source Applications

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3 Author(s)
Ching-Tsai Pan ; Center for Advanced Power Technologies, Department of Electrical Engineering, National Tsing Hua University , Hsinchu, Taiwan ; Ching-Ming Lai ; Ming-Chieh Cheng

This paper presents a novel integrated single-phase inverter with both high step-up ratio and buck-boost capabilities for low-voltage alternative energy source applications. An auxiliary step-up circuit is integrated with an isolated Ćuk-derived voltage-source inverter to achieve a much higher voltage-conversion ratio while avoiding using extreme duty ratios in both dc-side and ac-side switches. In addition, the proposed circuit possesses the automatic energy-transfer characteristic between parallel charging and series discharging of two capacitors to achieve a much higher voltage level. Moreover, the voltage stress of dc-side active switches can be reduced to below one half as compared with that of a traditional isolated Ćuk converter. Finally, steady-state characteristics, performance analyses, and representative experimental results are also made to show the merits of the proposed inverter.

Published in:

IEEE Transactions on Power Electronics  (Volume:25 ,  Issue: 9 )