Shaft speed sensor with analog output
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United States of America Patent
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Feb 14, 2012
Grant Date -
Oct 21, 2010
app pub date -
Apr 20, 2009
filing date -
Apr 20, 2009
priority date (Note) -
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status (Latency Note)
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Abstract
A 2-wire, loop-powered shaft rotational speed sensor device that outputs a 4-20 mA current in response to the shaft rotational speed. The device is comprised of a sensor (e.g., magnetic, optical) that senses an output from a sensor disk (e.g., magnetic, optical) and outputs a series of voltage pulses whose frequency varies with the shaft rotational speed. A microcontroller measures this pulse frequency and generates a digital code representative of that frequency. A digital-to-analog converter generates an analog waveform in response to the digital code. A loop-powered, voltage-to-current circuit generates the output current in response to the analog waveform.
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