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Trends in Electrical Engineering Original Research

Fast Charging of Lithium-Ion Batteries Using a Full-Bridge Rectifier and Buck Converter with SOC Tracking

  1. K. Priyanka Department of Electrical and Electronics Engineering, Bapatla Engineering College, Bapatla
  2. G. Ruchitha Department of Electrical and Electronics Engineering, Bapatla Engineering College, Bapatla
  3. G. David Department of Electrical and Electronics Engineering, Bapatla Engineering College, Bapatla
  4. B. Kavya Department of Electrical and Electronics Engineering, Bapatla Engineering College, Bapatla
  5. Ravindra Janga Department of Electrical and Electronics Engineering, Bapatla Engineering College, Bapatla

Abstract

This paper presents a simplified and cost-effective approach to electric vehicle (EV) fast charging by replacing the conventional neutral point clamped (NPC) converter with a full-bridge diode rectifier followed by a buck converter. The proposed topology is designed to deliver a regulated 80 V DC from a three-phase AC grid to charge a lithium-ion battery at a controlled current of 3 A. The converter design includes a three-phase diode bridge rectifier, appropriately sized filter components, and a buck converter operating at a switching frequency of 20 kHz. A key focus of the study is on real-time monitoring of the battery’s state of charge (SOC) using the Coulomb counting method, allowing performance evaluation under dynamic charging conditions. Simulation results demonstrate that the simplified converter configuration effectively supports the fast charging profile of a 14S Li-ion battery pack, achieving accurate SOC tracking and efficient power transfer. This research highlights the feasibility of using a full-bridge rectifier and buck converter combination in place of complex multilevel converters, making the system more suitable for low-cost and compact EV charging stations. The observed system performance suggests significant potential for deployment in DC microgrid-based charging infrastructures.

Keywords

References (10)

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