Capacitance measuring systems

Details Capacitance measuring systems Capacitance measuring systems

G - Physics

01

R

G01R 27/26 (2006.01) G01F 23/26 (2006.01)

Patent

CA 2401123

It is known to measure the capacitance of a probe in a capactive fuel-gauging system by means of a reference capacitor. In the present invention the probe and reference capacitors are 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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