Title: Improved power density based magnetically isolated better power quality bidirectional integrated on-board charger

Authors: Bhagat Singh Prajapati; Ravindra Kumar Singh

Addresses: Department of Electrical Engineering, Motilal Nehru National Institute of Technology Allahabad, Prayagraj 211004, India ' Department of Electrical Engineering, Motilal Nehru National Institute of Technology Allahabad, Prayagraj 211004, India

Abstract: The significant design considerations of on-board chargers (OBCs) are better efficiency and more power density. To improve OBC power density in terms of weight, area, and cost, the charger can be integrated with an electrical drive system. In this paper, an isolated bidirectional integrated on-board charger (IOBC) is proposed with a bidirectional voltage source converter (VSC), which utilises the stator windings of the BLDC motor to charge battery stacks when the vehicle is at rest. In propulsion mode, the same VSC switches are used as an inverter to drive the BLDC motor. The design consideration and steady-state operation of the proposed charger are presented. The input power factor (IPF) and total harmonic distortion (THD) of grid voltage and current are observed to assure power quality aspects. Additionally, the proposed IOBC is capable to carry out charging operations using single-phase domestic outlet along with propulsion of electric vehicles without introducing any other circuit. It also provides reduced switching stress, less voltage, and current ripples as well as lower filter size.

Keywords: bidirectional integrated on-board charger; magnetic isolation; voltage source converter; VSC; BLDC motor; input power factor; IPF.

DOI: 10.1504/IJPELEC.2024.142270

International Journal of Power Electronics, 2024 Vol.20 No.3, pp.201 - 225

Received: 25 Jan 2024
Accepted: 04 Jun 2024
Published online: 16 Oct 2024 *

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