Patent ID: 9620967
Date: 2017-04-11
CPC Classifications: B60L,G01R,H02J,Y02T

Claim:
1. A circuit for measuring battery cell voltage in a plurality of battery cells connected in series comprising: a first transimpedance amplifier and a first resistor, the first transimpedance amplifier having a first input configured to be connected to a first pole of one battery cell in the plurality of battery cells and a second input connected to the first resistor, the first resistor being further configured to be connected to a second pole of the battery; a cascade configuration of a plurality of transimpedance amplifiers connected to the first transimepdance amplifier and the first resistor, a plurality of potential replication devices, and a plurality of resistors connected to the first transimpedance amplifier, the cascade configuration further comprising: a first constant current source connected to an output of the first transimpedance amplifier; a second constant current source connected to a supply voltage input in a final transimpedance amplifier in the plurality of transimpedance amplifiers in the cascade configuration; and a measuring circuit connected to one resistor in the plurality of resistors that is connected to the second input of the final transimpedance amplifier in the plurality of transimpedance amplifiers in the cascade configuration, the measuring circuit comprising: