| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a terminal unit having USB interface functions, capable of charging a battery for a traveling machine, in accordance with current limit and voltage regulations. SOLUTION: A power voltage from a host machine 2 is supplied to a traveling machine 1a, and a battery 14 is charged by a charging circuit 13. At this time, charging current is detected by a current detection circuit 15, and current is restricted by a current-limiting circuit 16, so as to obtain a prescribed value. The supply voltage is converted into voltage to be supplied to a circuit in the traveling machine 1a by a voltage conversion circuit, and when the voltage is in a suspension mode detection or fully charged condition, it is switched to charger 3 side by a charging switching circuit 17 to stop the supply of power voltage to the charging circuit 13.</p> |
