| 摘要 |
A two-stage charging device including a power supply device and a battery module is provided. The battery module is equipped with a linear charging device, a controller and a battery. During the charging process, the controller determines the voltage difference between the main supply voltage provided by the power supply device and the battery voltage, and then outputs an adjusting signal to the power supply device according to the obtained voltage difference. Then the power supply device adjusts the supply voltage according to the adjusting signal to maintain the voltage difference between the supply voltage and the battery voltage approximately at a pre-set voltage level. The battery voltage will rise along with the passing of the charging time. If the voltage difference between the main supply voltage and the battery voltage is smaller than a lower voltage level, the controller will increase the voltage level of the adjusting signal so as to increase the power supplied by the main power supply. Conversely, if the voltage difference between the supply voltage and the battery voltage is larger than an upper voltage level, the controller will reduce the voltage level of the adjusting signal to enable power supply device to reduce the power supplied by the main power supply. Therefore, by making appropriate adjustments according to the level of the adjusting signal, the main supply voltage can be maintained at a voltage level slightly above the battery voltage.
|
