Advanced Design and Optimization of Novel Fibonacci Switched-Capacitor Converters for Ultra-High-Efficiency DC-DC Power Conversion

Abstract

The study explores the design and analysis of two DC-DC converter configurations integrated with solar photovoltaic (PV) renewable energy systems, comparing the conventional boost converter with a novel Fibonacci switched-capacitor (FSC) boost converter. Advanced Maximum Power Point Tracking (MPPT) algorithms, including Perturb and Observe (P&O), Incremental Conductance (INC), Genetic Algorithm (GA), and Particle Swarm Optimization (PSO), are paired with both converters to optimize energy extraction from solar PV systems. Simulation results reveal that both converter topologies, when combined with the appropriate MPPT algorithms, effectively maximize power output from the solar PV system.The FSC converter demonstrates exceptional performance, particularly in terms of current handling and voltage regulations. Featuring a modular arrangement of capacitors and MOSFETs synchronized by the CD4007 IC, the FSC converter adapts efficiently to dynamic load changes and varying irradiance conditions, resulting in enhanced current control, minimized output voltage fluctuations, and improved voltage regulation. Integrated with the GA-MPPT algorithm, the FSC converter achieves a significant boost in output current, reaching up to 70 A compared to just 10 A for the conventional boost converter. Furthermore, the FSC design excels in reducing electromagnetic interference (EMI) and simplifies thermal management, making it an ideal solution for high-efficiency applications. Both converter topologies are validated through MATLAB/Simulink simulations and hardware implementations. The hardware prototype, incorporating IRF540 MOSFETs and 22 μF capacitors, shows the scalability, compactness, and reliability of the FSC converter. The findings highlight the potential of the FSC converter in renewable energy systems, automotive applications, portable electronics, and other high-efficiency, compact systems. It positions the FSC topology as a promising alternative to traditional inductor-based designs, offering an innovative solution to address performance limitations in renewable energy conversion.