Abstract:
This paper presents a high-precision resistance measurement system for shunt-based current sensors in battery-powered vehicles to calibrate the resistance drift of the sh...Show MoreMetadata
Abstract:
This paper presents a high-precision resistance measurement system for shunt-based current sensors in battery-powered vehicles to calibrate the resistance drift of the shunt resistor due to aging. To measure the resistance of a 25 µΩ shunt resistor using a 10 Ω reference resistor with a ratio of 400,000:1, we proposed a two-step ratiometric resistance measurement technique using a second reference resistor with an intermediate resistance value. In addition to a linear regulator-based current generator (LRCG) that generates a DC excitation current for resistance measurement, a switching regulator-based current generator (SRCG) generates an AC excitation current to improve power efficiency. The implemented system demonstrates less than 0.12 % (30 nn) resistance measurement error with a 25 µΩ shunt resistor.
Published in: 2023 IEEE SENSORS
Date of Conference: 29 October 2023 - 01 November 2023
Date Added to IEEE Xplore: 28 November 2023
ISBN Information: