A metal strip shunt resistor of 100μΩ, with a power rating of 5W enabled converting of large currents to equivalent smaller voltage drops which are amplified to ADC voltage levels using operational amplifiers with ultra-low offset values. The high noise reduction has been achieved by using a PulSAR ADC with large signal to noise ratio (SNR) and implementation of a Kalman filter based exponential averaging algorithm. While averaging algorithms reduce the Gaussian noise completely, the high precision ADC and operational amplifiers reduce other random noise. Compared to the state-of-the-art, this device provides better noise reduction. The proposed prototype provides a wide current sensing range, typically ☑50 A, with a very low noise (~5mA) and high accuracy over the entire measurement range. In this work, a current measurement device for battery management systems (BMS) has been presented, which is a key technology in the monitoring and development of energy storage systems.
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