US9110118B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9110118-B2 |
| Application number | US-201213686437-A |
| Country | US |
| Kind code | B2 |
| Filing date | Nov 27, 2012 |
| Priority date | May 24, 2010 |
| Publication date | Aug 18, 2015 |
| Grant date | Aug 18, 2015 |
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A proximity sensor includes a relatively simple health monitoring circuit. The proximity sensor includes a variable gain oscillator, a feedback circuit, and a proximity determination circuit. The variable gain oscillator has a gain that varies with the proximity of a target to a sensor coil, generates an oscillating electrical signal having a substantially constant amplitude magnitude, and generates an energy signal representative of the electrical energy needed to sustain oscillations. The feedback circuit supplies feedback to the oscillator, and the proximity determination circuit, based on the energy signal, supplies a proximity signal representative of target proximity to the sensor coil. The health monitor circuit also receives the oscillating electrical signal and supplies a health status signal representative of proximity sensor health.
Opening claim text (preview).
What is claimed is: 1. A proximity sensor, comprising: a variable gain oscillator adapted to receive electrical energy, the variable gain oscillator including a sensor coil and having a gain that varies with proximity of a target to the sensor coil, the variable gain oscillator coupled to receive a feedback signal and configured, in response to the feedback signal, to (i) generate an oscillating electrical signal having a substantially constant amplitude magnitude and (ii) generat…
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