Abstract:

Battering monitoring systems are a critical aspect of electric and hybrid electric vehicles. A stacked IC approach is used to interface with high voltages. In this thesis, a stackable cell monitoring device which can monitor 7 cells per IC has been designed, fabricated and evaluated for performance. The IC has a 12-bit SAR ADC to measure individual cell voltages and temperature. The measured accuracy of these voltages is less than 4.5 mV which corresponds to 0.1% of the maximum cell voltage of 4.5 V. The reference voltage with respect to which cells are to be balanced, is obtained by a separate reference generation block in the IC. In order to meet the accuracy requirement of the ADC which is a part of the design, a piecewise-linear curvature corrected bandgap circuit has been designed and implemented.