High Voltage Resolution Auxiliary Power Converter for Online Battery Impedance Measurement

Dam, SK and John, V (2019) High Voltage Resolution Auxiliary Power Converter for Online Battery Impedance Measurement. In: 11th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2019, 29 September - 3 October 2019, Baltimore, pp. 5450-5457.

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Abstract

Battery impedance measurements can be used to monitor battery health. In impedance spectroscopy based health monitoring, battery impedance is measured over a frequency range and relevant battery parameters are estimated from the measured impedances. Power converter used for charging and discharging of the battery can be used for impedance measurement. However, the output voltage resolution of the power converter may not be sufficient to produce small amplitude sinusoidal perturbation required for impedance measurement. It is shown in this work that it is possible to use a small power rated auxiliary power converter along with the main charge/discharge converter to provide the desired voltage resolution for impedance measurement. The auxiliary converter is a plug-in module which uses an ultra-capacitor and does not require an external power source to supply the required energy during the impedance measurement. The proposed approach is experimentally verified with a prototype and it is shown to be capable of producing small voltage perturbation over a wide frequency range. © 2019 IEEE.

Item Type:	Conference Paper
Publication:	2019 IEEE Energy Conversion Congress and Exposition, ECCE 2019
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; Health monitoring; Impedance spectroscopy; Series converter; Voltage resolution
Department/Centre:	Division of Electrical Sciences > Electrical Engineering
Date Deposited:	06 Jan 2023 07:27
Last Modified:	06 Jan 2023 07:27
URI:	https://eprints.iisc.ac.in/id/eprint/78820

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