Process control field device with circuitry protection
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United States of America Patent
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Sep 1, 2015
Grant Date -
May 2, 2013
app pub date -
Oct 31, 2011
filing date -
Oct 31, 2011
priority date (Note) -
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Abstract
A wireless field device for use in an industrial process control system includes a power source having a power source output. Field device is circuitry powered by the power source output. A protection circuit is configured to protect the field device circuitry. The protection circuit include reverse polarity protection circuit coupled to the power source output that electrically isolates the power source output from the field device circuitry in response to a reverse polarity connection between the power source output and the field device circuitry. An overvoltage protection circuit disconnects the power source output from the field device circuitry is a voltage of the power source output exceeds a threshold.
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