Shunt enhancement logic circuit

Details Shunt enhancement logic circuit Shunt enhancement logic circuit

B - Operations, Transporting

61

L

346/32

B61L 1/20 (2006.01) B61L 13/00 (2006.01) H03K 19/007 (2006.01)

Patent

CA 1044793

SHUNT ENHANCEMENT LOGIC CIRCUIT ABSTRACT OF THE DISCLOSURE A signaling circuit adapted to be used with railroad tracks or the like for ensuring fail-safe performance in respect to the operation of a control device, such as a track relay, which must function in a fail-safe manner, typically to become de- energized after a set period and to release or drop away when any . emergency or failure occurs, thereby to produce a safe action, such as providing a warning signal to the engineer or operator of a train. The signaling circuit includes a quick-acting shunt detector which operates to detect short-duration shunting effects and functions to so extend or enhance them that they produce the desired result of releasing the track relay.

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