Electric vehicle (EV) charging stations are becoming increasingly widespread, but their front-end rectifiers often degrade grid power quality by introducing high-input current harmonics, a low power factor, and voltage distortion. Although conventional diode bridge rectifiers (DBRs) are simple and low-cost, they typically exhibit total harmonic distortion (THD) exceeding 25% and power factors below 0.80. To address these issues, active power factor correction (PFC) techniques have been employed in the literature; however, they increase system complexity, cost, and control algorithm sophistication. Thus, this paper proposes a linear integrated transformer (ILT)-based DBR, which is designed to improve power quality in EV charging stations without relying on active control mechanisms. The proposed configuration integrates a linear transformer, passive filter network, and diode bridge to achieve both voltage step-down with galvanic isolation and harmonic mitigation in a single structure. This system offers improved voltage regulation, flux balancing, filter resonance, and reduced current distortion. The proposed system is validated using MATLAB/Simulink R2021a. The results demonstrate that it achieves a THD of 4.32%, complying with IEEE 519 harmonic standards. In addition, the input power factor improves to 0.981. The system also reduces the DC output voltage ripple from 6.8% to 1.2%, enhances voltage regulation by 9.1%, and increases overall efficiency to 96.3%. These findings establish the proposed ILT-DBR as an affordable, robust, and compact solution for next-generation EV charging infrastructure, specifically designed to meet the needs of smart grid deployment and integration in Tier-2 and Tier-3 cities, where simplicity and power quality compliance are priorities.
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Integrated Linear Transformer-Based Diode Bridge Rectifier for Improved Power Quality in Electric Vehicle Charging Stations
Published:
03 December 2025
by MDPI
in The 6th International Electronic Conference on Applied Sciences
session Electrical, Electronics and Communications Engineering
Abstract:
Keywords: Diode bridge rectifier; Electric vehicle charging; Linear transformer; Power factor; Power quality; Total harmonic distortion; Vehicle-to-grid technology
Comments on this paper
Ravikanth Garladinne
4 December 2025
Interesting and good work
srinivas chalasani
5 December 2025
Innovative work
DIMMITI RAO
5 December 2025
Transformer based rectifier design effectively enhances power quality in EV charging stations.
Meghavathu Nayak
11 December 2025
good work and good topic
Satya Nagamani Pothu
11 December 2025
Good try inenhancing the power requirement of EV vehicles
