A New Variant of Turns-Ratio Independent Shoot-Through Current-Based Magnetically-Coupled Z-Source Inverter With Smooth DC-Link Voltage and Enhanced High-Gain

In a magnetically coupled impedance-source (MCIS) inverter, the low value of shoot-through (ST) current is desired to reduce the ratings and losses of the power converter. In this regard, turns-ratio-independent ST current is an important requirement. Very few inverters (active-switched Y-source MCIS inverters) are found in a recent article, which claims turns-ratio-independent ST current as a figure of merit. But it is observed that the voltage gain of the turn-ratio-independent ST current-based configuration is lesser than the turns-ratio-dependent ST current-based inverters. Therefore, this brief proposes a new variant of an active-switched MCIS inverter with a smooth DC-link voltage, which simultaneously exhibits enhanced voltage gain and a turns ratio-independent ST current. The voltage gain of the suggested network is higher than that of the recent equivalent MCIS inverters for the same magnitude and duration of shoot-through current, i.e., the voltage gains per shoot-through current (combined figure of merit) are significantly improved in the proposed inverter. The switching device power (SDP) is also reduced in the suggested inverter. Its desired operation is experimentally verified.