摘要：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 of the converter. Another uncertainty estimator scheme, namely, disturbance observer is proposed to estimate the uncertainties and then a pulsewidth modulation based sliding mode control technique is proposed. Both the proposed schemes are compared and their robustness to the uncertainties is proved by simulation in MATLAB/Simulink.
关键词：Dc-dc converter;noninverting buck-boost;adaptive based control;disturbance observer;sliding mode control;robustness
