Patent ID: 6236215
Filing Date: 2001-05-22
Classification: G01R

Abstract:
A cell voltage detection circuit for a plurality of cells connected in series to each other in a battery and adapted to detect a voltage of each of the cells, comprising:a first input selecting means connected to positive and negative electrodes of each cell to select either the positive or negative electrode of a selected cell and acquire a voltage of the cell;a second input selecting means connected to the positive and negative electrodes of each cell to select either the positive or negative electrode of the selected cell and acquire a voltage of the cell;a voltage detecting means for acquiring a detected output voltage from output voltages from the first and second input selecting means,wherein the voltage detecting means comprises an operational amplifier and a plurality of resistor provided for the operational amplifier, the operational amplifier having a noninverting input terminal connected to the first input selecting means and an inverting input terminal connected to the second input selecting means; anda processing means for converting the detected cell output voltage from the voltage detecting means from analogue to digital for calculating to thereby determine the voltage of the individual cell,wherein the processing means comprises an analogue/digital converter to convert a detected output voltage of a cell from an analog to digital, and an arithmetic unit which calculates a digital output from the analog/digital converter to provide a voltage of each cell.