Patent ID: 6028415
Filing Date: 2000-02-22
Classification: G11C,H02J

Abstract:
A charging control device for connecting a charging unit that outputs a constant-voltage and a constant-current with a battery unit which includes a secondary battery via connecting terminals, so that said secondary battery is charged by said charging unit, whereinsaid charging unit comprises:a constant-voltage constant-current circuit for supplying an output having a fixed voltage and a fixed current, anda first voltage detection circuit for comparing the fixed voltage output from said constant-voltage constant-current circuit with a first threshold level and for generating a first detection signal corresponding to a first comparison result, wherein said battery unit comprises;a secondary battery to be charged with the output of said constant-voltage constant-current circuit, anda second voltage detection circuit for comparing a charging voltage of said secondary battery with said first threshold level and for generating a second detection signal corresponding to a second comparison result, and wherein said charging unit further comprises:an output control circuit supplied with said first and second detection signals from said first and second detection circuits, respectively, and for stopping said output of said constant-voltage constant-current circuit when one of said first and second detection signals exceeds a second threshold level.