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In this study, an adaptive non-linear controller is designed for DC-DC buck/boost converter which is robust and stable against converter load changes, input voltage variations and parameter uncertainties. The proposed controller is developed based on input-output linearisation using an adaptive backstepping approach. The controller can be applied in both continuous and discontinuous conduction modes (CCM and DCM). Owing to non-minimum phase nature of buck/boost converter, the output voltage of this converter is indirectly controlled by tracking the inductor reference current. The inductor reference current is generated by a conventional PI controller. Using a MATLAB/Simulink toolbox and a stand-alone TMS320F2810 digital signal processor from Texas Instruments, some simulations and practical results are presented to verify the capability and effectiveness of the proposed control approach.

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SUMMARY In this paper, an adaptive nonlinear controller is designed for regulating the output voltage of DC‐DC buck converters, which is stable and robust with subject to widely changes of load demands and input voltage variations. The proposed controller is developed based on adaptive backstepping approach and can be applied for both Continuous and Discontinuous Conduction Modes (CCM and DCM). Using a stand‐alone TMS320F2810 digital signal processor from Texas instruments, some simulations and experimental results have been obtained to verify the proposed control approach. These results are in good agreement and prove the effectiveness and capability of the controller for both CCM and DCM operations. Copyright © 2012 John Wiley & Sons, Ltd.

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