A Family of Coupled Dual-Winding Impedance-Source Inverters With Continuous Input Currents and No DC-Link Voltage Spikes

Impedance-source inverters with coupled inductors can provide much higher voltage gains, but occasionally at the expense of discontinuous input currents and large voltage spikes at their dc-links. The former is caused by the absence of inductances at their inputs, while the latter is due to unintentional interruptions of leakage currents through their coupled inductors. These problems have now been solved here by a new family of dual-winding impedance-source inverters (DW-ISIs). Each DW-ISI can recycle the leakage energy from its two windings to a few clamping capacitors, which in turn help prevent the voltage spikes. This, together with the presence of an inductance for smoothing its input current, renders the family of DW-ISIs to be highly effective, while not compromising the voltage and current stresses when compared with other precedent inverters. In addition, to simplify the circuit analysis, a reactive component elimination method has been proposed in this article. Simulation and experimental results have confirmed the validity of the proposed topologies.