Adaptive control of non-inverting buck-boost converter

This paper presents an approach to system identification and adaptive control of non-inverting buck-boost converter in presence of large signal changes, uncertainty of converter´s component and effects of imperfect modeling. Feedback loops of DC-DC converter are typically designed conservatively so that the closed loop regulation and stability margins are maintained over pre-determined range of operating conditions. The proposed approach is capable of maintaining a high performance response without the instability issue of converter. In presence of uncertainty on parameters of DC-DC converter, a digital adaptive controller based on system identification and minimum degree pole placement is proposed. To verify the validity of the proposed digital controller, an experimental set-up is constructed for non-inverting buck boost converter and the fully digital adaptive control is implemented by a micro controller. The experimental results show that the capability of adaptive controller during different operating conditions.