Regulated Soft-Switching Power Supply Using Buck-Boost Converter

Among all dc-dc converters, the Buck-Boost converter is the most prominent one which plays major role in stepping up/down the input de voltage without incorporating any intermediate ac stage. The output voltage equation mentioned in literature is based on the continuous conduction of shunt inductor/boost inductor. So this equation fails to comply when the current in the shunt inductor becomes discontinuous. So the theoretical average output voltage differs from discontinuous one at a common duty-ratio and the magnitude of deviation in voltage is again based upon the gravity of discontinuity of the inductor current. The buck-boost converter lacks in maintaining linearity of voltage with reference to duty-ratio. So in this paper, a soft-switching buck-boost converter under close-loop environment is proposed to achieve desired regulated voltage thus enhancing efficiency of the power supply equipment.