Passive Damping Stabilization for Constant-Power Loaded Boost Converter

This paper presents a methodology to stabilize an open-loop boost power converter feeding a constant power load. The stabilization is ensured by means of three different passive damping filters, an RC parallel branch placed at the output port, an RL series branch placed at the input, and an RL parallel branch placed also in the input port. The presented methodology allows the design of the system under a pre-defined dynamic behavior and the established size, weight, and cost limitations. Analytical models are obtained for each topology and a theoretical study is carried in order to determine the optimal resistance that ensures the damping of the peak of the output impedance of the converter with each stabilizer. The loci of the poles of the system in the complex plane is studied in terms of the stabilizer parameter values to estimate the dynamics of the complete system. Finally, numerical examples and PSIM simulations are discussed for the RC damping topology to validate the presented concepts.