Experimental validation of nine‐level switched‐capacitor inverter topology with high voltage gain

Abstract

This paper proposes a new switched-capacitor nine-level (9L) inverter with reduced switch count. In the proposed topology, floating capacitor (FC) is employed as a voltage booster, and it does not need any additional sensors to maintain the voltage across the FC. Due to additional FC, the number of dc sources and voltage stress on switches is reduced. Moreover, the proposed topology can be cascaded to achieve more voltage levels. Various parameters are considered in the comparison of the proposed topology with other recent switched-capacitor topologies. Simulation and experimental results demonstrate the performance with different load and modulation index variations.

A novel nine‐level boost inverter with a low component count for electric vehicle applications

“…The proposed circuit is found to present a low value of TSV in comparison to other topologies except 26 . Circuit 26 has the lowest blocking voltage among all the circuits under consideration but at the cost of a considerable component count. Moreover, the H‐bridge switches in References 11,12 have to endure a peak of the output voltage, whereas the proposed circuit does not require an H‐bridge at the back end to generate polarity.…”

“…As shown in Table 4, the proposed inverter circuit requires the least number of components. Though the topologies in 11,14,26 need the same number of switches compared to the proposed topology, the former requires a high number of capacitors, diodes. At the same time, the proposed topology does not need diodes.…”

General method for constructing multi‐input high‐boost DC‐DC converters with low spike current

“…Thus, a series of transformer‐less converters have been put forward, characterized by high step‐up structures, including cells of switched‐inductor (SL), 10 switched‐capacitor (SC), 11 hybrid switched‐inductor‐capacitor (HSLC), 12 and active‐switched‐inductor (ASL) 13 . The high‐gain SL‐based boost converter proposed in Yao et al 10 can achieve higher power conversion efficiency of 94.76%.…”

“…However, the converter requires four active switches and is only suitable for single input. And based on switched capacitor technology, a nine‐level inverter topology with high voltage gain is proposed in Mohamed Ali et al 11 In Faridpak et al, 12 an improved hybrid switched‐inductor/switched‐capacitor DC‐DC converters are proposed. Whereas for cases where the voltage gain is greater than 18 or the output power is greater than 70 W, the efficiency of the proposed converter drops significantly.…”

An extendable asymmetric boost multi‐level inverter with self‐balanced capacitors

“…The charge/discharge mechanism of capacitors in switched‐capacitor based converters has been fully investigated in 11 . The necessity of employment of voltage balancing strategies is the main concern of SCCMLIs that increases the complexity of control strategy 12–17 . During last decade, many different structures have been presented for SCCMLs in the literature.…”