K. Shreya1 , Harsh Srivastava1 , Pranay Kumar1 , G. Ramanathan1 , Prassanna Madhavan1 , and C. Bharatiraja This email address is being protected from spambots. You need JavaScript enabled to view it.1
1Department of Electrical and Electronics Engineering, SRM Institute of Science and Technology
Received: August 9, 2020 Accepted: November 11, 2020 Publication Date: June 1, 2021
Copyright The Author(s). This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are cited.
The proposed model comprises a CUK converter fed resonant LLC (Inductor Inductor Capacitor) converterbased charging solution for an e-bike battery pack, wherein the CC/CV (Constant Current/Constant Voltage) charging algorithm is implemented through the LLC converter. Heretofore, modifications were made in DCDC converter topology to incorporate bridge-less topology to increase efficiency to eliminate current inrush issues and involve galvanic isolation. Moreover, bypassing the switching losses presented by a half-bridge converter. The presented topology operates a pulse-width modulated CUK converter in DCM (discontinuous conduction mode), which serves natural current shaping without an input ripple filter. The LLC converter eliminates switching losses by undergoing ZVS (zero voltage switching) and allows high-frequency operation. The closed-loop control of the trigger pulses of the CUK and LLC converters is responsible for the CC/CV charging of the battery and hence the reduced charging time. An 800 Wh CC/CV charger with a current rating of 16 A is developed to charge a 48 V, 20 Ah Li-ion battery, where the battery is expected to charge in less than 2 hours.
Keywords: Electric vehicle battery charger, DC to DC converter, Power Electronics converters Battery Charger electric vehicles
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