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Design and implementation of a battery charger with a state-of-charge estimatorTIAN-HUA LIU{{, DER-FA CHEN{ and CHUN-CHIEH FANG{ In this paper, a novel integrated system for a battery charger with a state-of-charge estimator is proposed. First, by using a 16-bit MC80196 microprocessor, two di erent methods for estimating a battery's state-of-charge are presented. Then, the current of the charger is adjusted according to the estimated result. The charger, which has a zero current switching topology, performs with both a high input power factor and a high e ciency. In addition, the microprocessor e ectively integrates the charger and the state-of-charge estimator. Several experimental results validate the theoretical analysis.