Optimized Power Stage Design of Low Source Current Ripple Fourth-Order Boost DC–DC Converter: A PSO Approach

In this paper, a particle swarm optimization (PSO)-based design of power stage components of a fourth-order dc-dc converters is presented. A low source current ripple fourth-order boost converter is analyzed and used the PSO algorithm for its energy storage elements design and optimization. Through time-domain analysis, state-space models are established, and then, discrete-time-domain transfer functions are formulated. The origin of an up-down glitch in the control-to-output transfer function and its implications on dynamics is addressed. A generalized optimization procedure, based on PSO, with a possibility to extend for other higher order topologies is proposed to resolve the contradictory issues of steady-state and dynamic performance requirements. A 12- to 28-V 30-W prototype converter is used to compare the steady-state and dynamic performance both in simulation and experiment. The distinct feature of low source current ripple of the converter and its PSO-based optimized design is experimentally demonstrated.