An Extended Coupled-Inductor QZS Inverter with High-Frequency Input Current Ripple Suppression

This paper presents an extended coupled inductor quasi-Z-source inverter (ECL-QZSI), which has advantages like input current ripple suppression and high gain ability. Adding third coupled winding series with the input inductor causes to reduce high-frequency input current ripple. Among the impedance source converters in the same condition to have equal current ripple, the amount of inductor will be decreased significantly compared to the absence of third series winding. Unlike trans-Z-source inverter, in proposed topology input current is continuous which eliminates protector energy source filter and voltage gain is boosted by reducing turns number of primary winding transformer which decreased costs and volume of the transformer. In comparison with improved
$\Gamma\text{ZSI}$
, proposed converter provides high voltage gain ability. Therefore, ECL-QZSI uses lower duty cycle and consequently higher modulation ratio with reduced elements stress and enhanced quality of output waveforms. All the aforementioned ECL-QZSI features are validated through simulation results in PSIM software and theoretical equations that are given in the following to confirm function of the suggested structure.