Method and apparatus for measuring the voltage and charge of a battery
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United States of America Patent
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Sep 1, 1992
Grant Date -
N/A
app pub date -
May 22, 1989
filing date -
May 22, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Method and apparatus for measuring the voltage and state of charge of a secondary battery. The voltage and state of charge values are taken by a circuit every four (4) seconds by reading voltage, waiting two (2) seconds, reading current, waiting two (2) seconds, and repeating the voltage readings and the current readings. The circuit includes a 4-bit microprocessor, CMOS analog switches, and two operational amplifiers. The voltage and current readings are taken from dual-sloped converters, and the values determined by software algorithms in the microprocessor.
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