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Abstract:A non-isolated high boost DC-DC converter topology based on a switched-capacitor (SC) structure is introduced in this paper. By controlling the duty cycle in each period, the voltage gain of the converter is adjusted. The main features of the proposed SC converter are the continuous input current, achieving high voltage gain with low voltage and current stress on the power components, no use of a high-frequency transformer, and easy to increase the voltage by adding the SC cell.

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Recently, multilevel inverters have become more attractive for researchers due to low total harmonic distortion (THD) in the output voltage and low electromagnetic interference (EMI). This paper proposes a single-phase cascaded H-bridge quasi switched boost inverter (CHB-qSBI) for renewable energy sources applications. The proposed inverter has the advantage over the cascaded H-bridge quasi-Z-source inverter (CHB-qZSI) in reducing two capacitors and two inductors. As a result, cost, weight and size are reduced. Furthermore, the dc-link voltage of each module is controlled by individual shoot-through duty cycle to get the same values. Therefore, the proposed inverter solves the imbalance problem of dc-link voltage in traditional CHB inverter. This paper shows the operating principles and analysis of the single-phase cascaded H-bridge quasi switched boost inverter. Also, A control strategy for the proposed inverter is shown. Experimental and Simulation results are shown to verify the operating principle of the proposed inverter. Index Terms-Renewable energy sources, cascaded H-bridge inverter, quasi switched boost inverter, quasi Z-source inverer, shoot-through state, multilevel inverter.

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This study proposes a new single-phase boost DC-AC converter based on the switched-boost network. The proposed converter has the following features: (i) the input current is continuous; (ii) the input and output share the same ground; and (iii) the output voltage waveform has only three levels (positive, zero, and negative levels). Compared with the conventional single-phase half-bridge Z-source inverter (HB-ZSI), the proposed converter uses one additional active switch, but fewer inductors and capacitors. In addition, the peak output voltage of the proposed converter is twice that of the HB-ZSI for the same shoot-through duty cycle. The operating principles, parameter design, small-signal analysis, and comparison with the single-phase HB-ZSI are presented. The simulation and experimental results are shown to verify the operating theory of the proposed converter. Finally, an isolated boost DC-DC converter is developed in the experiment with 42 V input and 600 V output as an example for the application of the proposed converter.

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