CHARGE CONTROL CIRCUIT

PROBLEM TO BE SOLVED: To solve the problem wherein charge control circuits in the past have been based on the precondition that the voltage and current of a charger used to charge a secondary battery are predetermined, however, because of the standardization of the shapes of IF connectors, there is a very high probability that a problem such as heating, ignition, or charging failures due to excessive output will occur in a charger. SOLUTION: A charge control unit 20 reads the voltage value of a charger 30 from a charging voltage computation unit 24. When the charging voltage is out of a specified range, it causes a data display unit 21 to display a message to the effect that charging is infeasible to inform the user of that. Further, it stops the charge control operation. When the charging voltage is within the specified range, the charge control unit determines whether the allowable value of current of the charge 30 read from a data storage unit 31 is within the range of the charging standards for a terminal device. When the allowed current value is within the range, it causes a secondary battery 13 to be charged at that allowed current value. When the allowed current value is out of the range, it causes the secondary battery to be charged at the upper limit value of charging current in the charging standard for the terminal device. Thereafter, it carries out charging in fast charging mode. COPYRIGHT: (C)2006,JPO&NCIPI