Two enhanced quasi-z-source boost AC–AC converters featuring continuous input current and low components stress

This research proposes two enhanced single-stage quasi-Z-source AC-AC converters. Both topologies have non-inverted output that utilizes pulse width modulation (PWM) and are founded on a boost AC-AC chopper. Further, the converters' ability to maintain a common ground between the input and output is a significant advantage. Additional merits of the suggested configurations include fewer components with less voltage and current stress on semiconductors and easy control with low-rippling continuous input current. Furthermore, the low voltage and current stresses on the switches lead to a reduction in power losses. The process of operation and the transfer of energy among different inductive and capacitive components are explained by considering the voltage and current stresses on the components via steady-state analysis. Additionally, a thorough analysis and detailed description of the design approach applied to all elements are considered. Ultimately, the performance of the introduced converters has been confirmed by implementing experimental prototypes. In the experimental tests, the converters are operated with a voltage source of 30V at 50Hz and duty ratios of 0.7 and 0.41, resulting in a peak output voltage of 100V at output powers of 260W and 325W. The obtained results confirm that the suggested converters exhibit suitable performance and high efficiency, indicating their adaptability for use in various power conversion and energy processing applications.