Document Type : Original Research Paper

Authors

• Pezhman Bayat
• Peyman Bayat
• Seyed Mehdi Mousavi

Department of Electrical Engineering, Hamedan University of Technology, Hamedan, Iran.

Abstract

Background 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 8× (480 V output from a 60 V input) while maintaining low voltage stress across switching components. The MOSFET experiences a peak voltage of 230 V and a current of 28 A, well within safe operating limits. Diodes D1–D4 exhibit voltage stresses ranging from 230 V to 520V, with average currents between 2.65 A and 20.3 A. The input inductor sustains a continuous current of 19.5 A, validating the converter’s smooth current profile. Efficiency measurements show a peak of 96.93% at 230 W output, with performance remaining above 92% even at full 1 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.

Keywords

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

Main Subjects

• Power Electronics

Open Access

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Publisher

Shahid Rajaee Teacher Training University