MONITOR FOR BATTERY VOLTAGE

摘要

PROBLEM TO BE SOLVED: To accurately and separately measure a voltage with a simple construction in a plurality of unit cells constructing a battery. SOLUTION: Diodes 31-35 are provide between a connecting point 1a of unit cells 11-15 and a connecting point 2a of resistors 22-25. A current changing means 4 changes a current flowing in a resistor line 2 to make continuity or carry a current to diodes 35-31 in order from the diode 35 so as to allow a switching point detecting means 51 to detect a switching point where discontinuity is charged over to continuity in the diodes 31-35, and then a voltage of the unit cells 11-15 is arithmetically operated based on a current flowing in the switching point of resistor line 2 and a value of resistance in resistors 22-25. With such a constitution, a voltage can be measured with a simple circuit constitution even in the case of a plurality of unit cells.