Unified model of high step-up DC-DC converter with multi-cell diode-capacitor/inductor network

摘要

Multi-cell diode-capacitor/inductor based boost derived DC-DC converter provides a simple solution for high step-up voltage regulation in solar and fuel cell generation. However, many passive components increase the order of system model and complexity. Transient modeling analysis reveals that time constant of each component in diode-capacitor/inductor network is much smaller than that of other circuit if the directly charging and discharge processes between capacitor through diode is fast enough. The voltage/current relationship of each capacitor/inductor in multi-cell network is fixed. Multi-cell diode-capacitor/inductor network can be seemed as multi-stage DC transformer. Based on the unique feature, this paper proposes the reduced-order modeling approach for high step-up DC-DC converter with multi-cell diode-capacitor/inductor network. Finally, simulation and experiments verify the correctness and effectiveness of new modeling approach. The unified reduced-order model contributes to better understanding of circuit characteristic and simplification of controller parameters design.