Patent ID: 7196523
Filing Date: 2007-03-27
Classification: G01R

Abstract:
1. A circuit for monitoring charge/discharge of a battery, comprising: a first terminal connected to one end of a single current detection resistor serially connected to the battery so as to detect a charge current or a discharge current of the battery; a second terminal connected to the other end of the current detection resistor; a converter that converts a terminal potential of the first terminal at which a potential of the one end of the current detection resistor appears and a terminal potential of the second terminal at which a potential of the other end of the current detection resistor appears, into currents respectively; a first terminal capacitor that develops an integrated voltage with supply of the current as converted by the converter from the terminal potential of the first terminal; a second terminal capacitor that develops an integrated voltage with supply of the current as converted by the converter from the terminal potential of the second terminal; a comparator that compares the integrated voltages developed by the first and second terminal capacitors with a reference voltage; and an output section that outputs a difference between