Capacitance measuring systems
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United States of America Patent
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Aug 17, 2004
Grant Date -
Mar 6, 2003
app pub date -
Aug 29, 2002
filing date -
Sep 4, 2001
priority date (Note) -
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status (Latency Note)
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Abstract
A capacitance fuel-gauging system has a capacitive probe and a reference capacitor charged in opposite senses from respective dc voltage sources via switches operated in antiphase. Two further switches alternately discharge the capacitors to a 0 volts rail. The outputs of the probe and the reference capacitor are connected to a summing node, which is connected to an amplifier via a pair of switches operated in antiphase to rectify the output. The amplifier connects to a processor, which controls the relative outputs of the voltage sources and provides an output indicating the value of the probe.
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