Doctoral Dissertations


Ramin Rahimi

Keywords and Phrases

High Step-Up DC-DC Converters; High-Voltage Gain DC-DC Converters; Power Electronics Converters; Renewable Energy Applications; Solar Photovoltaic System; Voltage Boosting Techniques


"This research is focused on developing several advanced topologies of high step-up DC-DC converters to connect low-voltage renewable energy (RE) sources, such as photovoltaic (PV) panels and fuel cells (FCs), into a high-voltage DC bus in renewable energy applications. The proposed converters are based on the combinations of various voltage-boosting (VB) techniques, including interleaved and quadratic structures, switched-capacitor (SC)-based voltage multiplier (VM) cells, and magnetically coupled inductor (CI) and built-in-transformer (BIT). The proposed converters offer outstanding features, including high voltage gain with low or medium duty cycle, a small number of components, low current and voltage stresses on the components, continuous input current with low ripple, and high efficiency. This research includes five new advanced high step-up DC-DC converters with detailed analyses. First, an interleaved converter is presented, which is based on the integration of two three-winding CIs with SC-based VM cells. Second, a dual-switch converter is proposed, which is based on the integration of a single three-winding CI with SC-based VM cells. Third, the SC-based VM cells are utilized to present three new Z-source (ZS)-based converters. Fourth, two double-winding CIs and a three-winding BIT are combined with SC-based VM cells to develop another interleaved high step-up converter. Finally, two double-winding CIs and SC-based VM cells are adopted to devise an interleaved quadratic converter with high voltage gain. The operating and steady-state analyses, design considerations, and a comparison with similar converters in the literature are provided for each converter. In addition, hardware prototypes were fabricated to verify the performance of the proposed converters"--Abstract, page iv.


Ferdowsi, Mehdi

Committee Member(s)

Shamsi, Pourya
Kimball, Jonathan W.
Bo, Rui
Rownaghi, Ali A.


Electrical and Computer Engineering

Degree Name

Ph. D. in Electrical Engineering


Missouri University of Science and Technology

Publication Date

Summer 2022

Journal article titles appearing in thesis/dissertation

  • A three-winding coupled inductor-based interleaved high voltage gain DC-DC converter for photovoltaic systems
  • A three-winding coupled inductor-based dual-switch high step-up DC-DC converter for photovoltaic systems
  • Z-source-based high step-up DC-DC converters for photovoltaic applications
  • An interleaved high step-up DC-DC converter based on integration of coupled inductor and built-in transformer with switched-capacitor cells for renewable energy applications
  • An interleaved quadratic high step-up DC-DC converter with coupled inductor.


xviii, 200 pages

Note about bibliography

Includes bibliographic references.


© 2022 Ramin Rahimi, All rights reserved.

Document Type

Dissertation - Open Access

File Type




Thesis Number

T 12164

Electronic OCLC #