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Discontinuous Conduction Mode analysis of Single-phase Switched Boost Inverter with a dc load

As a potential alternative to conventional voltage source inverter (VSI), the single-phase Switched Boost Inverter (SBI) has been extensively researched owing to its ability to provide higher ac output voltage and superior reliability against shoot-through. Additionally, SBI can simultaneously operate with an ac load as well as a dc load, which can be connected in parallel to the dc bus capacitor. However, in literature, low-frequency ripple analysis and design of switch-impedance network have been presented with the assumption of continuous conduction mode (CCM) operation as well as the absence of a dc load. This paper aims to explore a more detailed analysis taking into account the possibility of SBI operation going into discontinuous conduction mode (DCM) with a dc load, which may result in voltage dip in the dc-link voltage. In accordance with the analysis, a modified design of passive elements is presented. The non-idealities in the circuit are also considered, which reveals that the selection of dc load has an impact on the boost factor as well. Finally, with the help of a hardware prototype, the single-phase SBI is operated in both CCM and DCM with the variation of the dc load to demonstrate the validity of the analysis.