Improved quadratic boost converter using switching coupled-inductor and voltage-doubler

A novel high voltage gain non-isolated boost converter based on the normal quadratic boost converter topology is introduced. In the referenced circuit, a powerful charging capacitor can power the switched inductor. In the proposed topology, this inductor is improved using a coupled-inductor. The primary part of the coupled-inductor takes the place of the switched inductor and the secondary part is laid in the output side. A voltage-doubler is combined with the secondary part to increase the voltage gain and reduce oscillations during operations. The main advantage of this topology is that it has a high voltage gain and it can be controlled by both the duty cycle of the switch and the turns ratio of the coupled-inductor. The voltage stress on the switch and capacitors is relatively low, while the efficiency is high, over 90%, which is quite necessary in practical situations. This converter is designed to operate in the continuous-current mode and the boundary condition mode is also analysed. Mathematical derivations of operations and power losses and software-based simulation results can provide main features of this topology. Hardware test results can demonstrate the potential utility in both industrial and domestic areas. © 2019, © 2019 Engineers Australia.