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High Gain Hybrid DC-DC Topology Combining Switched -Inductor and Switched-Capacitor Techniques for PV Applications
Seyed Moein Mortezaie , Mohammad Sarvi
Abstract:   (27 Views)
This paper proposes a transformerless, non-isolated high-gain DC–DC conversion stage intended for interfacing photovoltaic (PV) sources. The topology uses a hybrid leg arrangement in which inductor-based switching cells are combined with a symmetrically arranged capacitor switching network forming three identical branches. These branches share the input power and collectively provide a large step-up ratio while maintaining balanced branch currents. The converter operates with continuously flowing inductor currents, and an analytical model is developed to obtain closed-form relations for voltage gain, semiconductor stresses, and design equations for the main passive components. Guidelines are provided for selecting inductors, capacitors, and device ratings under ripple constraints, resonant concerns, and safe operating limits. To validate the analysis, a 250-W implementation is examined using a detailed switching model in MATLAB/Simulink. The results show stable steady-state waveforms over a broad range of duty-cycle combinations and indicate that semiconductor voltage stress remains well below the output level, enabling the use of fast, low-voltage-rated switches and yielding good efficiency. The dual-duty modulation strategy improves adaptability to variations in PV irradiance and load by allowing flexible gain control through coordinated adjustment of duty cycles.

 
Keywords: Transformerless Converter, Enhanced voltage conversion, Switched-Inductor-Switched Capacitor Topology, Photovoltaic Systems
Full-Text [PDF 1668 kb]   (3 Downloads)    
Type of Study: Research Paper | Subject: Converters
Received: 2026/02/13 | Revised: 2026/07/14 | Accepted: 2026/06/24
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Creative Commons License This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.
Creative Commons License
© 2022 by the authors. Licensee IUST, Tehran, Iran. This is an open access journal distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial 4.0 International (CC BY-NC 4.0) license.