Battery pack voltage detection apparatus
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United States of America Patent
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Oct 12, 2004
Grant Date -
Mar 18, 2004
app pub date -
Sep 18, 2002
filing date -
Mar 27, 2001
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A battery cell voltages are read in parallel to a capacitor for each battery block of a battery pack by the use of analog switches. The stored voltages of the capacitors are A/D-converted sequentially through the analog switches. Thereby, each cell voltage is measured with suppression of measurement error by the use of the simple flying capacitor type circuit structure, while the circuit safety is secured by providing the current limitation resistor having a large resistance value between each cell and the analog switch. A noise reduction circuit having a pair of capacitors is provided.
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