Non-Overparametrized Adaptive Backstepping Control of PWM DC-DC Non-Inverting Buck-Boost Power Converter

Due to continuous need for efficient converters to interface low voltage dc sources to ac systems of different voltage levels, this paper presents a recursive non-overparametrized adaptive backstepping design methodology and Lyapunov theory to control dc-to-dc switched mode non-inverting buck-boost converter. Despite the great development in this field, in this paper we assume uncertainty of input voltage, inductance, capacitance and also resistance in converter circuit and avoid undesirable overparametrization when choosing update laws for those uncertainties. Moreover, we avoid transformation to parametric strict feedback form usually needed when using backstepping control as PWM converters are not transformable. MATLAB/Simulink was used to simulate designed controller and results indicate the fast response and stability under a possible variation in the load or input voltage source.