G - Physics
08
B
340/163, 324/58
G08B 21/00 (2006.01)
Patent
CA 1070410
ABSTRACT A circuit for sensing closed and open states of an electrical contact pair in a monitoring station. The circuit includes a pulse generator for generating sampling pulses, a galvanic isolator, and an energy storage circuitry and the contact pair in series for allowing the pulse generator to apply the sampling pulses to the storage circuit via the galvanic isolator. The storage circuit stores enough charges to build a DC voltage of a certain magnitude using the sampling pulses, when the contact pair is open, and discharges the stored charge through the contact pair to the ground and allows the sampling pulses to go to the ground via the galvanic isolator and the storage circuitry, when the contact pair is and remains closed. The sensing circuit also includes an output circuitry coupled to the galvanic isolator for sensing the pulses being transmitted through the isolator and providing an output signal indicative of the open or closed state of the contact pair.
274059
Brandman Ygal
Cohen Yitzhak
LandOfFree
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