| 摘要 |
A battery charger includes a switching circuit (8) for supplying the current to the timer (3) from the secondary battery (6). The battery charger also includes a detecting circuit (7) for activating the switching circuit (8) by charging the voltage into the capacitor (11). Further, the battery charger includes diodes (16) and (14) for supplying the current to the timer (3) from the outside battery (22) and from the secondary battery (6) respectively, and for preventing backward current flow to the respective power sources. The battery charger of the present invention prevents overcharging and extends the lifetime of the secondary battery in the mobile apparatus.
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