公开(公告)号：JP2000241515A

公开(公告)日：2000-09-08

申请号：JP2000040810

申请日：2000-02-18

Applicant: ST MICROELECTRONICS SRL

Inventor： CLAUDIA CASTELLI ,  FABRIZIO FURATERUNARI ,  ADALBERTO MARIANI ,  ALEX POJEERU

IPC: H02J7/00 ,  G01R31/36 ,  H01M10/48

Abstract: PROBLEM TO BE SOLVED: To monitor the state of a battery charge by executing the trimming step of a system to substantially completely compensate for an offset. SOLUTION: A counter for determining the state of a battery charge is provided with a circuit for detecting the charge and discharged currents of a battery. An addition circuit comprises a differential amplifier AMP where an input end is connected to the terminal of a resistor Rs for detecting a battery current, and a resettable integrator stage INTEGR that integrates a signal outputted from the amplifier AMP by a switch SW. While a first comparator CompH compares a ramp that is outputted from an integrator with a first threshold VthH, and finally generates a logic charge interrupt signal INCR, a second comparator CompL compares a signal that is outputted from the integrator with a second threshold VthL, and finally generates a logic charge interrupt signal DECR.