Development of bi-directional switched-capacitor DC-DC converter for EV powertrain application

K. Mounika Nagabushanam; Tarkeshwar Mahto; Somesh Vinayak Tewari; Ramanjaneya Reddy Udumula; Majed A. Alotaibi; Hasmat Malik; Taha Selim Ustun

doi:10.1016/j.jestch.2025.102016

Engineering Science and Technology, an International Journal (May 2025)

Development of bi-directional switched-capacitor DC-DC converter for EV powertrain application

K. Mounika Nagabushanam,
Tarkeshwar Mahto,
Somesh Vinayak Tewari,
Ramanjaneya Reddy Udumula,
Majed A. Alotaibi,
Hasmat Malik,
Taha Selim Ustun

Affiliations

K. Mounika Nagabushanam: Department of Electrical and Electronics Engineering, SRM University, AP 522502, India
Tarkeshwar Mahto: Department of Electrical and Electronics Engineering, SRM University, AP 522502, India
Somesh Vinayak Tewari: Department of Electrical and Electronics Engineering, SRM University, AP 522502, India
Ramanjaneya Reddy Udumula: Department of Electrical and Electronics Engineering, SRM University, AP 522502, India
Majed A. Alotaibi: Saudi Electricity Company Chair in Power System Reliability and Security, King Saud University, Riyadh 11421, Saudi Arabia; Department of Electrical Engineering, College of Engineering, King Saud University, Riyadh 12372, Saudi Arabia; Corresponding authors.
Hasmat Malik: Department of Electrical Power Engineering, Faculty of Electrical Engineering, University Technology, Malaysia (UTM), Johor Bahru 81310, Malaysia; Department of Electrical Engineering, Graphic Era (Deemed to be University), Dehradun 248002, India; Corresponding authors.
Taha Selim Ustun: Fukushima Renewable Energy Institute, AIST (FREA), National Institute of Advanced Industrial Science and Technology (AIST), Fukushima, Koriyama 9630298, Japan

DOI: https://doi.org/10.1016/j.jestch.2025.102016
Journal volume & issue: Vol. 65
p. 102016

Abstract

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The research presents a novel Bidirectional Switched Capacitor DC-DC (BSCD) Converter and demonstrates its application in integrating a battery with an electric vehicle’s (EV) traction motor. During discharging, the motor is powered by the battery through the converter, and during charging, the traction motor functions as a generator, returning the recovered energy to the battery via the converter. The recommended converter employs a two-duty cycle operation to enhance voltage gain while minimizing circuit components. It utilizes a switched capacitor (SC) cell, enhancing the voltage transfer ratio by operating capacitors CS1 and CS2 in parallel or series. The work includes analysis of the converter’s steady state, mathematical approach, state-space modelling, stability, and efficiency. The proposed converter achieves an efficiency of 90.66 % in charging mode and 96.6 % in discharging mode, with a Gain Margin of 54.4 dB and Phase Margin of 8.09°, indicating stability. Comparative evaluations with existing BDCs are also provided. The implementation of a closed-loop simulation using MATLAB/Simulink and dSpace software validates the performance of the suggested converter-based drive. Furthermore, an experimental investigation of a 200 W, 30 V/430 V configuration confirms the converter’s practical viability.

Published in Engineering Science and Technology, an International Journal

ISSN: 2215-0986 (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Technology: Engineering (General). Civil engineering (General)
Website: https://www.sciencedirect.com/journal/engineering-science-and-technology-an-international-journal

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