Design and analysis of a dual input quasi SB-SC cell high gain converter

Abstract

ABSTRACT A DC-DC converter that can deliver high voltage gain and isolation with dual input is presented. The proposed converter incorporates a quasi-switched boost topology with an inductor in series with the main source. A switched capacitor cell and an auxiliary input source are connected before a push-pull switching stage to improve voltage boosting and the utilisation of dual input source. The high-frequency transformer provides galvanic isolation and improved voltage gain. The voltage doubler circuit (VDR) preceding the load has the ability to convert the transformer output to a DC supply and double the boost factor. Detailed operating waveform, theoretical and simulation results of the converter are presented with component selection and comparison with relevant converter topologies. A 250 W converter is implemented for an output of 400 V, when fed from two energy sources of 24 V and 12 V. The experimental results obtained satisfy the performance of the proposed converter. The benefits of the converter are (i) utilisation of hybrid energy sources, (ii) near to continuous input current, (iii) galvanic isolation and (iv) very high boost voltage.