<p>This paper analyses the nonlinear phenomena in current mode controlled buck-boost converter. The system undergoes various operating regions whenever there is a change in non linear elements presented in the system as well as in the loads. In this work, inductor current is considered as the reference for analysis.The results show that the converter enters into period-1, periodic doubling and chaotic regions as per the parameter (I<sub>L</sub>) variations. The proposed control strategy, weak periodic perturbation (WPP) method tries to stabilize the system from the chaotic behavior.The buck boost converter along with the control system is simulated using MATLAB/SIMULINK software tool and the results are presented.The hardware implementation of the system is done and the results are verified with the simulation results. It shows that the WPP can transform the system behaviour from the chaotic region to the periodic one. </p>
This paper presents a dynamic modelling and control of a Zeta converter as well as boost converter evaluated in MATLAB/SIMULINK based simulation. A Zeta converter topology provides a positive output voltage from an input voltage and also provides option for regulating an unregulated power supply. The Zeta converter is configured from buck converter but unlike buck converter, it includes two inductors and two capacitors. A comparison between Zeta converter and Boost converter is done using sliding mode controller under the load voltage variation. The feedback loop provides voltage regulation against any disturbance in load voltage by keeping input side constant. The simulated output voltage, current and graph between voltage gain and duty ratio are shown in the paper.
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