Continuous Input Current Configurations of Enhanced-Boost Quasi-Z-Source Inverters

In this paper two novel topologies of enhanced-boost quasi Z-source inverters operating in continuous input current configuration is proposed. These presented topologies provide same boost factor as that of the enhanced-boost Z-source inverter (EB-ZSI)/ EB-qZSIs. Compare to EB-ZSI, these topologies provide less stress across the capacitors. Similar to EB-qZSIs, the proposed topologies share common ground with the source and inverter bridge to reduce the leakage current problem and reduces the starting inrush current problem. The configuration-1 provides less stress across the capacitors and low inrush current at start-up condition. Therefore, configuration-1 is taken as an example for analysis and implementation. The operating principle, impedance network parameters design, and comparison with other Z-networks are carried out. Finally, the theoretical analysis is validated with simulation results.