| 摘要 |
An exemplary battery charger includes an input interface arranged to connect to a DC power source, having a positive terminal and a negative terminal; an output interface arranged to connect to a battery, having a positive terminal and a negative terminal; a switch circuit connected between the positive terminals of the input interface and the output interface, comprising a control terminal; a detecting resistor connected between the negative terminals of the input interface and the output interface; a detecting circuit connected between the negative terminals of the input interface and the output interface to detect a voltage across the detecting resistor and output a digital signal; and a processor receiving the voltage signal to determine whether the battery is fully charged and generate a voltage signal to the control terminal of the switch circuit via an inverting circuit for turning off the switch circuit when the battery is fully charged.
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