Patent ID: 8305045
Filing Date: 2012-11-06
Classification: H02J

Abstract:
1. A charge control circuit, comprising: a charge controller for controlling an operation of a charger that charges a secondary battery; a voltage detector for detecting a terminal voltage of the secondary battery; and a current detector for detecting a current flowing to the secondary battery, wherein the charge controller repeats a plurality of times constant current constant voltage charge in which the charge controller supplies a charging current having a predetermined set current value from the charger to the secondary battery to cause the charger to execute constant current charge, and, when the terminal voltage detected by the voltage detector becomes equal to a predetermined threshold voltage value during the execution of the constant current charge, causes the charger to execute constant voltage charge by supplying a charging voltage having the threshold voltage value from the charger to the secondary battery until a current value detected by the current detector becomes equal to a predetermined threshold current value, and increases the threshold voltage value and reduces the set current value and the threshold current value each time the constant current constant voltage charge is repeated, wherein in constant current constant voltage charge, which is repeated subsequent to constant current constant voltage charge that is started when the terminal voltage detected by the voltage detector is less than a predefined determination voltage, the charge controller makes the set current value, the threshold voltage value and the threshold current value higher than those obtained in previous constant current constant voltage charge.