Maximum Current Limit Equalization by Phase Shift Control of Multi-Active Half-Bridge Equalizer

Tathode, MM and Dam, SK and Baiju, P and John, V and Kundu, U (2022) Maximum Current Limit Equalization by Phase Shift Control of Multi-Active Half-Bridge Equalizer. In: 2022 IEEE Energy Conversion Congress and Exposition (ECCE), 09 - 13 October 2022, Detroit, MI, USA.

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Abstract

For improved utilization, Lithium-ion batteries are operated with currents close to the design current of the battery, demanding fast voltage equalization. Active multicell-to-multicell equalizers can achieve fast equalization by simultaneous and efficient charge transfer from all the overcharged cells to all the undercharged cells. Phase-Shifted Multi-Active Half-Bridge(PSMAHB) equalizer is a multicell-to-multicell equalizer with open-loop control that offers faster equalization by maintaining high equalization currents throughout the equalization. For the PS-MAHB equalizer, a dynamic phase-shift-based control algorithm is proposed to maximize the equalization currents to the design limit and enhance the equalization rate. A significant increase in the rate of equalization with the proposed control algorithm is verified in the simulation. The convergence of Li-ion cell voltages into a narrow band of 10mV verifies equalization operation with the developed compact hardware operating at 1MHz. The impact of peculiar step-response of the Li-ion cell voltage on the voltage-sensing-based equalization control algorithm and simple modifications brought in the control algorithm to reduce this impact are discussed. © 2022 IEEE.

Item Type:	Conference Paper
Publication:	2022 IEEE Energy Conversion Congress and Exposition, ECCE 2022
Publisher:	Institute of Electrical and Electronics Engineers Inc.
Additional Information:	The copyright for this article belongs to Institute of Electrical and Electronics Engineers Inc.
Keywords:	Battery management systems; Charge transfer; Equalizers; Lithium-ion batteries; Phase control; Space applications, 'current; Equalisation; Equalization currents; Half-bridge; High frequency HF; Li-ion; Li-ion cells; MHz; Multicell; Voltage equalization, Ions
Department/Centre:	Division of Electrical Sciences > Electrical Engineering
Date Deposited:	25 Jan 2023 10:03
Last Modified:	25 Jan 2023 10:03
URI:	https://eprints.iisc.ac.in/id/eprint/79512

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