ELECTRONIC CIRCUIT FOR MEASURING SERIES CONNECTED ELECTROCHEMICAL CELL VOLTAGES
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United States of America Patent
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Jun 25, 2002
Grant Date -
Jul 18, 2002
app pub date -
Dec 20, 2000
filing date -
Dec 31, 1998
priority date (Note) -
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status (Latency Note)
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Abstract
An electronic circuit for measuring voltage signals in an energy storage device is disclosed. The circuit includes a plurality of battery segments forming the energy storage device. An amplifier circuit is connected across one of the battery segments for converting a differential voltage to a reference current. A sense resistor is associated with the amplifier circuit to convert the reference current to a voltage signal which is proportional to the voltage across the battery segment. A voltage measurement node associated with the sensing resistor may be used for measuring the voltage signal. In one embodiment of the invention, a multiplexing and sampling circuit provides digitized voltage samples to a processor. The voltage level of each cell within the battery pack can then be monitored by the processor.
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