Patent ID: 7301306
Filing Date: 2007-11-27
Classification: H02J,Y02E

Abstract:
1. A charging and discharging control circuit comprising: a plurality of over-charge detection circuits that monitor a plurality of secondary batteries; a delay circuit that generates a delay time in response to outputs from the over-charge detection circuits; a charging and discharging switch control circuit that controls a charging and discharging switch circuit in response to outputs from the over-charge detection circuits and an output from the delay circuit; a plurality of detection circuits that detect a voltage higher than an over-charge detection voltage of the secondary batteries; and a circuit that chances a state of the charging and discharging control circuit between a normal state for controlling charging and discharging of the secondary batteries and a test state for evaluating a characteristic of the charging and discharging control circuit in response to signals from the plurality of detection circuits.