A noninverting buck-boost dc-dc converter can be operated in buck, boost and buck-boost
mode depending on an input voltage and desired output voltage. An input voltage must be
known to operate the converter in these operating modes. In this paper, two methods are
proposed to estimate uncertainties in input voltage and load resistance. First, state observer
based adaptive law is designed to estimate the uncertainties. Based on the estimates, a
pulsewidth modulation based sliding mode control is proposed to control the output voltage …