Patent ID: 6313637
Filing Date: 2001-11-06
Classification: B60L,G01R,H02J,Y02T

Abstract:
A voltage detecting device for a set battery which comprises a plurality of battery modules connected to each other in series, said voltage detecting device comprising:a plurality of differential voltage detecting circuits for detecting module voltages of said battery modules, respectively;an A/D convertor for A/D converting output voltages of said differential voltage detecting circuits; andreference voltage providing circuits for providing reference voltages to said differential voltage detecting circuits,wherein said differential voltage detecting circuits are grouped into several voltage detecting blocks so that differential voltage detecting circuits for respectively detecting module voltages of said battery modules contiguous to each other constitute one of said voltage detecting blocks, a common reference voltage is provided to said differential voltage detecting circuits belonging to a same voltage detecting block by said reference voltage providing circuit, and said reference potentials are set to values which differ from each other for said respective voltage detecting blocks.