Energy Based Switching Control Scheme for DC-DC Buck-Boost Converter Circuits

This paper has proposed an energy based switching control scheme for controlling dc-dc buck-boost converter circuits and analysed its stability and robustness against the parameter variations. There are three modes of operations, and the switching among these three modes depends on the reference voltage and the reference inductor current. The reference inductor current is calculated by the principle of energy balance. The reference voltage is designed to ensure that the voltage ripple as well as the average value of the output voltage remain constant in response to line and load disturbances. The phase plane analysis shows that the proposed control scheme is quite robust for wide range of parameter variations. The stability is estabilished by showing that the eigenvalues of the sensitivity matrix are zero, implying that the resulting system would be free from chaotic behavior and becomes super stable.