| 摘要 |
A battery charge controller has charge termination values that can be adjusted according to the initial charging current values so that charging is discontinued at a same charge level for all battery cells to prevent overcharging and undercharging. The battery charge controller includes a DC/DC converter that is coupled to a supply voltage and that provides a charging current to a battery, and a gain controller coupled to the DC/DC converter. The gain controller provides first and second gain-adjusted signals associated with the charging current. The charge controller further includes a charge termination detector that compares the level of the second gain-adjusted signal to a first predetermined reference signal and based on the comparison generates a charge termination signal. A pulse-width controller is coupled to the DC/DC converter. The pulse-width controller compares the charge termination signal, the first gain-adjusted signal, and a charging voltage of the battery to a second predetermined reference signal to vary a duty cycle of the DC/DC converter to vary the charging current supplied to the battery
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