DC-DC power supplies are playing significant role in different domains of engineering applications. Some converters such as boost, buck-boost, and fly-back have a right-half-plane zero (non-minimum phase system), hence it is difficult for the PID controller to exhibit good performance with load, line variations and parametric uncertainty. In this proposed work, design and implementation of type controllers have been performed by using k-factor approach and two different optimisation techniques (gravitational search algorithm and particle swarm optimisation) for obtaining better stability and performance for a closed loop DC-DC Switched mode boost converter. The closed loop control system has been implemented in real time dSPACE platform. The comparative closed-loop performances of a boost converter with classical, optimised PID and optimised type II/type III controllers have been produced. Simulations and experimental results are provided to demonstrate the effectiveness of optimised controllers for the proposed converter. Design and implementation of optimised type controller for switch mode converters has not been reported earlier in any literature.

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Summary DC‐DC switched mode power converter circuits are time varying and nonlinear in nature. This work analyzes the modeling and complex dynamics in voltage mode controlled (VMC) of the Boost converter in continuous conduction mode (CCM) of operation by using continuous‐time model. The switching converter is governed by naturally sampled constant frequency pulsed signals. Mathematical modeling of the boost converter numerically developed by using differential equations and tested in simulation software. The switching converter may exhibit fundamental, quasiperiodic, and chaotic oscillations by the systematic changing of converter's variables. The stability of the system investigated through the locus of the complex eigenvalues and the characteristic multipliers locating the onset of Hopf bifurcation. The one‐periodic orbit loses its stability via Hopf bifurcation, and the resulting attractor is a quasiperiodic orbit. A dSPACE controlled boost converter prototype hardware fabricated to establish the experimental studies in this work. Both the computational and experimental results have been included to validate the set analysis. It is observed that the route to chaos reached by the slow‐scale instability in this proposed work.

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