An Efficient Three-Port Partial Power Converter Based EV On-Board Fast Charger

Simulation results show that the contribution of the DC-DC converter is just 10% of the total charging power and over 90% of the power is given directly to the battery. This unique feature allows charger efficiency to approach 99% which is far greater than traditional full power processing charger configurations. The three-port design also minimises voltage stress and produces a three-level output voltage which decreases switching losses and improves converter dependability. The proposed charger provides a scalable, small and efficient alternative to the current electric vehicle charging systems. 1) Another important advantage of the proposed approach is its scalability. The architecture enables a higher charging power level to be used without requiring a change to the DC-DC converter rating. The charger’s high-power capability to charge electric cars makes it very attractive for such purposes in the future. 2) Three-Port Partial Power Processing converter is proposed for efficient on-board rapid charging of electric vehicles. The suggested design is composed of a three-port AC-DC converter and a bidirectional DC-DC converter based on the partial power processing approach. By diverting most of the charging current directly to the battery, the converter significantly reduces the power that must go through the DC-DC step. 3) Developed and tested comprehensive mathematical model, control approach, design methodology and operational concept. Using MATLAB/Simulink we were able to model both steady state and transient operating conditions such as power on/off cycles, load changes and disturbances in the supply voltage.  The results exhibited excellent dynamic responsiveness, stable performance, effective regulation of battery charge and unity power factor operation. 4) The simulation study shows that only 10% of the charging power is provided to the DC-DC converter and other 90% is directly provided to the battery. This feature in particular can enable the charger to achieve an efficiency level beyond 99%, which is significantly better than the efficiency of standard full-power-processing charger topologies. The three-port design has the advantage of a three-level output voltage, lower voltage stress, less switching losses, and enhanced reliability of the converter. 5) Therefore, the proposed charger is a good choice for modern electric car charging systems because of its scalability, small size and high efficiency.

[1] H. Tu, H. Feng, S. Srdic, and S. Lukic, “Extreme fast charging of electric vehicles: A technology overview,” IEEE Trans. Transp. Electrific., vol. 5, no. 4, pp. 861–878, Dec. 2019.   [2] M. Safayatullah, M. T. Elrais, S. Ghosh, R. Rezaii, and I. Batarseh, “A comprehensive review of power converter topologies and control methods for electric vehicle fast charging applications,” IEEE Access, vol. 10, pp. 40753–40793, 2022.   [3] J. Y. Lee and H.-J. Chae, “6.6-kW onboard charger design using DCM PFC converter with harmonic modulation technique and two-stageDC/DC converter,” IEEE Trans. Ind. Electron., vol. 61, no. 3, pp. 1243–1252, Mar. 2014.   [4] H.Wang, S. Dusmez, andA.Khaligh, “Design and analysis of a full-bridge LLC-based PEV charger optimized for wide battery voltage range,” IEEE Trans. Veh. Technol., vol. 63, no. 4, pp. 1603–1613, May 2014.   [5] S. Dutta, S. Gangavarapu, A. K. Rathore, R. K. Singh, S. K. Mishra, and V. Khadkikar, “Novel single-phase Cuk-derived bridgeless PFC converter for on-board EV charger with reduced number of components,” IEEE Trans. Ind. Appl., vol. 58, no. 3, pp. 3999–4010, May/Jun. 2022.   [6] A. Singh, J. Gupta, and B. Singh, “Design and control of two stage battery charger for low voltage electric vehicles using high gain buck-boost PFC AC-DC converter,” IEEE Trans. Ind. Appl., vol. 59, no. 5, pp. 6125–6135, Sep./Oct. 2023.   [7] A. Singh, J. Gupta, and B. Singh, “Bridgeless modified high-step-up gain SEPIC PFC converter-based charger for light EVs battery,” IEEE Trans. Ind. Appl., vol. 59, no. 5, pp. 6155–6166, Sep./Oct. 2023.   [8] A. Dixit, S. Gangavarapu, and A. K. Rathore, “High-efficiency discontinuous current-mode power factor correction-based plug-in battery charger for local e-transportation,” IEEE Trans. Transp. Electrific., vol. 7, no. 3, pp. 1134–1145, Sep. 2021.   [9] A. V. J. S. Praneeth and S. S. Williamson, “Modelling, design, analysis, and control of a non-isolated universal on-board battery charger for electric transportation,” IEEE Trans. Transp. Electrific., vol. 5, no. 4, pp. 912–924, Dec. 2019.   [10] A. V. J. S. Praneeth, D. Vincent, and S. S. Williamson, “An universal on-board battery charger with wide output voltage range for electric transportation,” in Proc. IEEE Energy Convers. Congr. Expo., 2019, pp. 1159–1165