| 摘要 |
PROBLEM TO BE SOLVED: To charge a battery optimally and shorten the charging time and improve the properties on the quantity of charging and the charging time, by controlling the constant voltage charging of a battery by the voltage drop value at the time of switching from constant-current charging to constant-voltage charge, and the value of the current which was flowing at that time. SOLUTION: CPU 5 is built in a charger 4, and the charging method is decided by the battery voltage detected by a battery voltage detecting means and the battery current detected by a battery current detecting means 3. CPU5 remembers the relation among the voltage drop value at switching from constant current charging to constant voltage charging, the constant voltage charging time, and the charging finish current. Then, it is possible to charge the battery optimally by deciding the constant voltage charging time by the voltage drop value at switching from constant current charging to constant voltage charging and the value of the current which was flowing at that time. Hereby, the charging time can be shortened and the properties on the quantity of charging and the charging time can be improved. |
