| 摘要 |
An adaptive battery charger circuit (32) including a processor (16) which adjusts the charging current of a controllable current source (12) in accordance with the battery charge acceptance of rechargeable battery (18). The battery charging cycle includes an initial charging phase characterized by a relatively high charge acceptance, an intermediate charging phase characterized by a decreasing charge acceptance and a rising battery temperature, and a final charging phase characterized by the battery (18) being at substantially full charge and the charge acceptance approaching zero. Each charging phase corresponds to one or more states of the processor (16). Multiple sets of conditions causing transitions between the states of operation are derived from a model of a battery under charge which relates charge acceptance which is determined by the battery voltage sensor (20), battery temperature which is sensed by temperature sensor (24), and cumulative supplied charge sensed by charge accumulator (114). During the intermediate charging phase, the charging current is adjusted to maintain a predetermined battery temperature for a predetermined duration. With this arrangement, the maximum product of charging current and charge acceptance maintainable for the battery (18) without exceeding a safe temperature is continuously achieved. |
