| 摘要 |
PROBLEM TO BE SOLVED: To provide a charging control method of secondary battery and a charger thereof, which can discriminate the full-charging condition of a secondary battery using a simple structure, without directly detecting charging current. SOLUTION: A voltage value obtained by adding the battery voltage of a battery 14 and the voltage by a current setting resistor R1 series-connected to a charging line is detected through a voltage detection input (A/D) of a controller 22 while a control FET18 is being charged in an on condition, and it is discriminated as to whether the battery 14 is charged fully based on a change in the voltage value, for example, a voltage change which changes by a very small amount downward from the maximum. |
