A Family of Nonisolated Active Switched Boost Quasi-Z-Source Inverters

Abstract

In this paper, a new family of nonisolated high step-up active switched boost quasi-Z-source inverters is proposed, which has an improved voltage boost inversion capability, joint the same ground between the dc source and bridge inverter, and draws continuous input current. In comparison to the traditional qZSIs, for the same total number of passive/active components used at the impedance network, the proposed inverter has lower voltage stress across the active switching devices, higher modulation index to improve the output waveform quality and lower input current ripple. The operating principle analysis, parameter design guideline and characteristic comparison with other high boost qZSIs have been presented. Finally, a laboratory prototype was constructed and tested with 60-V dc input and 110-Vrms ac output. And the experimental results have verified the effectiveness of the proposed topology.