Patent ID: 6437538
Filing Date: 2002-08-20
Classification: B60K,G01R,Y02T,Y10S

Abstract:
An apparatus for measuring a battery voltage, which divides a plurality of batteries connected in series into a plurality of blocks comprising at least one battery, and measures the voltage of said blocks, comprising:a power storage element installed in parallel for each of said blocks; a voltage detecting circuit for obtaining an output voltage corresponding to the voltage across said power storage element; a first switching element group comprising a plurality of switching elements, which is inserted between said power storage element and said block for connecting said power storage element and said block in parallel; a second switching element group comprising a plurality of switching elements, which is inserted between said power storage element and said voltage detecting circuit for connecting said power storage element and said voltage detecting circuit; and a driver for switching said first switching element group and said second switching element group, for driving all the switching elements belonging to said first switching element group at the same time, and for driving all the switching elements belonging to said second switching element group at the same time; wherein said driver, after turning said first switching element group on and turning said second switching element group off, when the voltage across said power storage element reaches the same voltage as said blocks, turns said first switching element group off for a predetermined period time so that said first and second switching element groups are turned off for the predetermined period of time, and then turns said second switching element group on.