Absolute position sensing by phase shift detection using a variable capacitor
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United States of America Patent
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-
Oct 16, 2001
Grant Date -
N/A
app pub date -
Feb 9, 1999
filing date -
Feb 10, 1998
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A low-cost, high-resolution capacitive position sensor is provided using a variable capacitor. A vane moves parallel to a stator, where a dielectric is interposed between vane and stator, such that the vane overlaps at least a portion of the stator, creating a capacitance that varies as the vane moves relative to the fixed stator. The capacitor circuit outputs a signal having a phase shift relative to an input driver signal based on the relative positions of the vane and stator. The phase-shifted signal is used to derive the absolute position of the vane with respect to the stator. Two or more stator can be provided to provide two phase-shifted signals and a difference signal free of common mode effects. Enhanced embodiments include interdigitated stator portions for greater sensing resolution, and/or a two or three-pole filter to double or triple the dynamic range of the sensor.
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