Journal
IEEE TRANSACTIONS ON POWER ELECTRONICS
Volume 31, Issue 11, Pages 7534-7543Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2016.2543499
Keywords
Coupled inductor; high-boost inverter; impedance source inverter; improved trans-current-fed switched inverter
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Funding
- Science and Engineering Research Board (SERB), Govt. of India [SB/S3/EECE/057/2015]
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Voltage source inverter cannot provide an output voltage higher than its input and needs a dead-time scheme for its switches to prevent dc-link short circuit due to spurious turn-on of switches by electromagnetic interference (EMI). Impedance source inverters have eliminated these disadvantages by providing boost functionality with improved EMI immunity. Coupled inductor-based impedance source inverters provided increased gain at the expense of increased coupled inductor turns-ratio. In this paper, a coupled inductor based high gain inverter is proposed, which achieves higher gain by increasing the coupled inductor turnsratio (n = n(2)/n(1)) within a very narrow turns-ratio range of 0 <= n < 1, which is a major improvement over the other coupled inductor based high boost impedance source inverters. The proposed inverter, named Improved Trans-Current-Fed Switched Inverter, is described along with its equivalent operating states and relation between its input and output variables are derived. The steady-state inverter waveforms are shown using PSpice simulations. The operation of the inverter is validated by the experimental results, which show strong correlation with the theoretical analysis. A 110-V RMS ac output is obtained from 26-V dc input using a coupled inductor with turns-ratio of 0.33 to demonstrate its high-boost operation.
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