INDUCTIVE LOOP PRESENCE DETECTOR
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United States of America Patent
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Issued Date -
Oct 13, 2011
app pub date -
Oct 12, 2010
filing date -
Oct 12, 2009
priority date (Note) -
Abandoned
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Abstract
An inductive loop presence detector for sensing objects, such as rail cars, containing one or more sensing loops. The inductive loop presence detector includes a backup power supply that is connected to a control unit of the detector to power the control unit during an interruption in the line voltage. The backup power supply includes batteries or capacitors that power the control unit when the line voltage is interrupted. The control unit of the inductive loop presence detector operates in a lower power mode when the control unit is supplied with power from the backup power supply. The control unit operates to auto-tune and supply power to the sensing loops to operate at the most desirable frequency based upon the inductance of the sensing loops.
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