Improved Luo converter modifications with increasing voltage ratio

The study provides improved modifications of the positive output super-lift Luo converter that allows significantly increase the voltage transfer gain by the modest means. In the simplest case this increase is provided by replacing the inductor by the switched-inductor structure consisting of two inductors and three diodes. This allows getting practically double increase in the line-to-output voltage ratio at the high values of duty cycle. Analysis of steady-state and transient conditions shows that the zeros of the transfer function for the converter, as well as for the conventional boost converter, are positive. The study indicates possible ways to further increase the output voltage ratio without additional switches - by the use of magnetically coupled inductors and diode-capacitor voltage multipliers. Simulation and experimental results confirm the theoretical analysis and the advantages of the proposed converters.