Operation and Analysis of Modified Quasi ZSI in DCM and CCM

This paper presents a new functional, powered boost adjusted inverter with improved voltage gain by incorporating an anti-parallel switch with a capacitor that allows two operating modes. These are Continuous Mode of Conduction and Discontinuous Operating Mode. In the proposed Quasi Z-source inverter (QZSI) voltage gain is significantly increased without the use of passive components by adding auxiliary switch. The two operating modes are distinguished by varying switched capacitor qZSI inductances and load conditions. The improvement potential of the proposed CC-qZSI can be expanded further (n-stages) by connecting Diodes and Capacitors in n No.of stages. The limiting conditions for CCM / DCM were derived. Detailed analysis of the voltage control power, current inductance ripples, stresses and converter losses on switching devices for CCM and DCM has been carried out. Both modes of operation are simulated and experimentally verified and validated.