A Family of High Step-Up Magnetically Coupled Impedance Source Inverters With Clamped DC-Link Voltage and Low Shoot-Through Current

Abstract

The use of coupled inductors in impedance source inverters improves the voltage gain performance at the expense of high dc-link voltage spikes and shootthrough (ST) currents. The result is an increase in voltage and current stresses on semiconductors, as well as reactive element capacity and overall losses. Thus, to overcome these problems, this letter proposes a new family of magnetically coupled impedance source (MCIS) inverters with a smooth dc-link voltage, a low ST current, and a higher voltage gain that are confirmed through experimental tests.