A hybrid switched capacitor dc-dc buck converter

This paper proposes a novel dc-dc buck converter that presents a static gain from 0.5 to 1, maintains the typical linear characteristics of the buck converter and reduces the voltage stress on the power components. The proposed converter is composed by a switched capacitor cell that was introduced in the conventional buck converter, which results in a hybrid buck converter. A theoretical steady state analysis is presented to obtain the steady values of all capacitor voltages and the inductor current. A generalization of the switched capacitor cell is also proposed to show the extensive applicability of this structure to dc-dc step-down voltage ranges. Simulation and experimental results are reported herein to corroborate the proposed structure and the theoretical analysis. The prototype specification designed was: 1 kW, 600 V in input voltage and 450 V in output voltage.