A novel soft switched positive output super lift Luo converter for Li-Ion battery charging

Abstract

Positive output super lift Luo converter is a recent topology in a DC/DC converter with a high voltage transfer gain. The modified soft switching technique for positive output super lift Luo converter is proposed, designed and simulated to show the mitigation of the limitations of high voltage gain super lift Luo converter. The modes of operation, equivalent circuit, dynamic equations and steady state differential equations of the soft switched super lift Luo converter under different time instants were derived to compute the resonant values. This proposed converter is simulated for both resistive load and Li-Ion battery charging. To charge Li-Ion battery, the classical Constant Current Constant Voltage (CCCV) charging method is used. The simulation results clearly show the elimination of switching losses for the resistive load, the battery charging profile with the state of the charge and transition from CC to CV.