Patent ID: 7282890
Filing Date: 2007-10-16
Classification: G01R

Abstract:
1. A voltage detector for a battery assembly having a plurality of unit cells which are connected to each other, the voltage detector comprising: a low voltage system circuit, which is supplied with electric power from a low voltage power source different from the battery assembly, the low voltage system circuit including: an enable pulse output unit, which outputs an enable pulse to command detection of a voltage across both terminals of a unit cell of the plurality of unit cells; and a high voltage system circuit, which is supplied with electric power from the battery assembly, the high voltage system circuit including: a voltage pulse output unit, which outputs a voltage pulse showing a voltage across both terminals of the unit cell of the plurality of unit cells; a switch, which is provided between each unit cell of the plurality of unit cells and the voltage pulse output unit; and a switch controller, which conducts ON-OFF control of the switch so that the each unit cell of the plurality of unit cells is successively connected to the voltage pulse output unit according to the enable pulse inputted from the enable pulse output unit, wherein the voltage pulse output unit outputs a voltage pulse for a period of time from a start of integration of one of a first voltage and a second voltage to when a first integration value of the one of the first and second voltages becomes equal to a second integration value obtained when the other of the one of the first and second voltages is integrated for a predetermined period of time, wherein the first voltage is a voltage across both terminals of the unit cell, and wherein the second voltage is a reference voltage.