In this study, a non-isolated high gain DC-DC converter is presented. The proposed converter yields a voltage conversion ratio value which is a cubic function of the voltage gain obtained from a boost converter. The proposed converter is synthesised by judiciously interfacing a two-phase interleaved boost converter with voltage-lift capacitor and a quadratic boost converter. Resultantly, the proposed converter yields a practical voltage gain of 21.11. Further, due to the use of interleaving technique, the input current is completely free from ripples. The proposed concept is validated by conducting experiments on 18/380 V, 160 W prototype converter. The experimental results clearly demonstrate that the proposed converter operates at a full-load efficiency of 95.6%. Further, by practically implementing a simple closed-loop control, the output voltage of the converter is quickly regulated against variations in input voltage and load current so as to provide the desired 380 V across the load terminals. © 2020 Institution of Engineering and Technology. All rights reserved.