Electricity: measuring and testing – Electrolyte properties – Using a battery testing device
Patent
1996-10-10
1999-06-22
Regan, Maura
Electricity: measuring and testing
Electrolyte properties
Using a battery testing device
340636, 324663, 320116, G01R 2726
Patent
active
059146060
ABSTRACT:
A circuit and method are presented for making differential voltage measurements when one or both measurement points are at voltages that exceed those allowed by a typical differential amplifier, and is particular useful for monitoring the individual cell voltages of a number of series-connected cells that make up a rechargeable battery in which some cell voltages must be measured in the presence of a high common mode voltage. Each measurement point is connected to an input of a respective voltage divider, with all the divider outputs connected to a multiplexer having two outputs. The two multiplexer outputs are connected to a differential amplifier. When the voltage dividers are "closely matched," the output of the differential amplifier is directly proportional to the differential voltage between the pair of points to which the dividers are connected, and the differential voltage between those two points is accurately determined. The voltage dividers divide down the voltage of each measurement point so that each is low enough to be input to a conventional differential amplifier. By selecting the "ratio" of each voltage divider, the circuit can be used to measure differential voltages in the presence of almost any common mode voltage. The invention requires a single differential amplifier powered by a conventional dual power supply.
REFERENCES:
patent: 5099211 (1992-03-01), Nowak
patent: 5710503 (1998-01-01), Sideris
patent: 5760587 (1998-06-01), Harvey
patent: 5805068 (1998-08-01), Bradus
Grunebach Georgann
Gudmestad Terje
Regan Maura
Sales Michael W.
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