An Efficient Control Approach for DC-DC Buck-Boost Converter

In this paper, an efficient control structure based on a PI controller for DC-DC buck-boost converter operation is proposed. By the proposed approach, accurate pulse width modulation (PWM) switching based operation duty ratio of the buck-boost converter is achieved by the closed-loop PI controller. The control law based on instantaneous values of the input voltage and the desired output voltage is used to support the PI controller to achieve an efficient and fast operation duty ratio. So the efficiency of the converter is improved to gain the desired high quality output voltage when the parameters of the converter operation are changed. Simulation studies have been done in MATLAB-Simulink to prove the efficiency of the proposed control approach based on the PI controller supported by the control law. The obtained results have shown that the proposed control approach achieves accurate and efficient operation for the buck-boost converter under different system conditions.