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A Ćuk Converter Cell Balancing Technique by Using Coupled Inductors for Lithium-Based Batteries

Department of Electrical Energy, Metals, Mechanical Constructions and Systems, Gent University, 9052 Gent, Belgium
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Energies 2019, 12(15), 2881; https://doi.org/10.3390/en12152881
Received: 27 June 2019 / Revised: 15 July 2019 / Accepted: 23 July 2019 / Published: 26 July 2019
(This article belongs to the Special Issue Electric Vehicle Power Conversion Technologies)
In this paper, a c ´ uk converter balancing method by using a coupled inductor for lithium based batteries is investigated. The proposed circuit is an active balancing circuit that will equalize eight battery cells in a series. In electrical vehicles (EV), a battery management system (BMS) is a vital task to achieve the best performance of the batteries and longer lifetime. The problem of voltage difference in a battery pack is an important issue to be improved. To overcome the voltage differences in battery string, an equalizing method is mandatory. The conventional c ´ uk converter requires 2(n − 1) switches to balance n cells, while the proposed circuit requires only n switches for n cells in series. In addition, the proposed developed topology uses coupled inductors instead of un-coupled inductors, unlike the traditional c ´ uk converter balancing method. Since the c ´ uk balancing transfers the energy among two adjacent cells, it requires a proportionately long equalization time particularly for long string battery packs, but the coupled inductor c ´ uk converter type overcomes this problem. The switches are N-channel metal-oxide field-effect transistor (MOSFET) to achieve lower drain-source on-resistance, R D S ( o n ) , and less voltage drop as compared to the P-channels. The switches are triggered by complementary signals. The coupled inductor is made in such a way to hold the same magnetizing inductance. It can be done by using five wires in one hand. The circuit contains five inductors, one magnetic core, with five winding for eight cells, and one capacitor for two cells. Therefore, the overall circuitry and complexity of the circuit are reduced, resulting in a more cost-effective and easy to implement circuit. The system also does not demand complicated control for battery equalizing. The experimental circuit was implemented and simulation results were obtained to confirm the validity of the proposed system. View Full-Text
Keywords: BMS; ćuk converter; coupled inductors; EV; li-ion; MOSFET BMS; ćuk converter; coupled inductors; EV; li-ion; MOSFET
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Farzan Moghaddam, A.; Van den Bossche, A. A Ćuk Converter Cell Balancing Technique by Using Coupled Inductors for Lithium-Based Batteries. Energies 2019, 12, 2881.

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