Z source based switched capacitor nine level boost inverter with a modified modulation strategy.

This article presents a Z source (ZS) based switched capacitor multilevel inverter (SC-MLI) with low capacitors charging inrush currents utilizing a modified modulation strategy. The topology generates nine output voltage levels with quadruple voltage gain utilizing eight power switches, five capacitors, two inductors, four discrete diodes, and a single DC source. The voltage gain can be further increased by applying shoot through (ST) states to the frontend ZS-network.

A single-phase direct buck-boost AC-AC converter with minimum number of components.

In this paper, a single-phase direct pulse width modulation (PWM) buck-boost AC-AC converter is proposed. The proposed converter utilizes a minimum number of semiconductor switches and passive components that decreases the converter power losses and offers high efficiency. It can be operated with simple PWM control and doesn't require soft-commutation strategies.