Switched-Capacitor Enhanced A-Impedance Design for High-Density, High-Gain DC-DC Applications

kground and Objectives: Impedance source networks have gained significant attention in electrical energy conversion due to their ability to overcome the limitations of conventional methods. While existing impedance-based converters offer various advantages, challenges such as voltage gain limitations and component stress remain. This study introduces an advanced ultra-gain enhanced A-source (UGEA-S) DC/DC converter incorporating switched-capacitor technology to address these concerns and significantly improve voltage gain.Methods: The proposed UGEA-S converter is designed to enhance energy conversion efficiency while minimizing voltage stress on switching elements. The topology integrates switched-capacitor techniques to achieve superior voltage gain, reducing reverse recovery issues in diodes and maintaining a continuous input current. A thorough theoretical analysis is conducted to explore its operational principles and steady-state behavior. Comparative assessments with other recently developed converters further highlight its distinct performance attributes. Additionally, MATLAB/Simulink simulations and experimental results are performed to validate the converter’s functionality under practical operating conditions.Results: Experimental, simulation and numerical analysis confirm that the proposed UGEA-S converter achieves an ultra-high voltage gain of up to ۸× (۴۸۰ V output from a ۶۰ V input) while maintaining low voltage stress across switching components. The MOSFET experiences a peak voltage of ۲۳۰ V and a current of ۲۸ A, well within safe operating limits. Diodes D۱–D۴ exhibit voltage stresses ranging from ۲۳۰ V to ۵۲۰V, with average currents between ۲.۶۵ A and ۲۰.۳ A. The input inductor sustains a continuous current of ۱۹.۵ A, validating the converter’s smooth current profile. Efficiency measurements show a peak of ۹۶.۹۳% at ۲۳۰ W output, with performance remaining above ۹۲% even at full ۱ kW load. These results demonstrate the converter’s resilience under dynamic conditions and its suitability for high-performance applications such as electric vehicles and renewable energy systems.Conclusion: The UGEA-S converter offers a robust and innovative solution for high-gain DC/DC conversion, addressing key limitations of conventional designs. Its exceptional voltage gain, reduced voltage stress, and stable current regulation make it a promising candidate for advanced energy systems. The findings underscore the converter’s feasibility for real-world applications, particularly in electric vehicle power systems. Future research can further optimize its design for enhanced efficiency and broader scalability.

کلیدواژه ها:

Electric vehicles ، High step-up ، Impedance source networks ، DC-DC converters