Improved “K” type seven‐level switched capacitor inverter topology with Self‐voltage balancing

Abstract

This paper proposes an improved "K" type seven-level switched capacitor inverter topology. The proposed topology consists of eight active switches, one floating capacitor, and two dc-link capacitors. The floating capacitors are charged and discharged in each half-cycle to maintain the capacitor voltage with the same value of the input voltage. The floating capacitor voltage is selfbalanced, and the output voltage is 1.5 times higher than the input voltage. To prove the superiority of the proposed topology, it is compared with the existing seven-level inverters in terms of maximum voltage stress on the switch and required the number of power components. The simulation and experimental validation are carried out for 1.6 kW, 50 Hz using a laboratory-based setup with a switching frequency of 5 kHz. The results are discussed highlighting the performance of the proposed topology for the dynamic load variations at different modulation indices. Both simulation results and experimental results have good agreement in terms of voltage balancing of flying capacitor. K E Y W O R D S multilevel inverter, voltage boosting, capacitor balancing and ANPC

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

“…Non-neutral clamped topologies were presented in other studies. [19][20][21] The triple voltage gain was obtained in Siddique et al, 12 which is double the voltage gain achieved in Liu et al 11 However, in Siddique et al, 12 the maximum voltage stress on the switch is twice the input voltage.…”

“…The sum of Equations 18,19,and 20 gives the overall losses of the proposed topology. Based on these equations, Figure 7A shows the variation of the efficiency with respect to the output power.…”

Review of reduced‐switch multilevel inverters for electric vehicle applications

“…Sathik et al 70 proposed a seven‐level improved K‐type switched‐capacitor inverter. It employs eight power switches, two diodes, one FC, and two DC link capacitors to achieve seven levels in the output voltage.…”

A twice boost nine‐level switched‐capacitor multilevel (2B‐9L‐SCMLI) inverter with self‐voltage balancing capability

“…Furthermore, flying capacitor (FC) multi-level inverters need a considerably large amount of flying capacitors for increasing the number of levels of output voltage, which increases the volume and cost of the inverter along with control complexity of the capacitor voltages. [3][4][5][6] To mitigate the limitations of conventional multi-level inverters, different authors have proposed various topologies with the primary objective of reducing the number of components in a topology, that is, with a minimum number of dc sources, semiconductor devices, capacitors. [7][8][9][10][11][12][13][14][15][16][17] A new nine-level quadruple switched-capacitor inverter is introduced in.…”