| 摘要 |
In a vehicle-mounted charging apparatus for a portable telephone set comprising a portable telephone set and a vehicle-mounted charger in combination, a constant voltage charging control microcomputer in the charger receives information on a voltage of a battery pack and information on the on/off state of power supply to the telephone set and performs charging control so that rapid charging is performed within an appropriate charging temperature range, while trickle charging is performed outside the appropriate charging temperature range, on the basis of information on the temperatures in the battery pack detected by a temperature sensor 15 provided in the battery pack. When trickle charging should be performed, a charging-special microcomputer is switched to a trickle charging mode. In this state, when the telephone set is supplied with power from the battery pack and the voltage of the battery pack is low, a constant voltage source in the charger is operated to supply power to the telephone set. When the charging-special microcomputer is switched to the rapid charging mode, the operation of the constant voltage source is stopped. Thus, the vehicle-mounted charging apparatus for a portable telephone set constructed as above is adapted to any condition of use in a vehicle-mounted state.
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