B - Operations – Transporting – 61 – L
Patent
B - Operations, Transporting
61
L
346/23
B61L 27/00 (2006.01) B61L 3/00 (2006.01)
Patent
CA 1133101
(Case No. 6997) ABSTRACT OF THE DISCLOSURE A light emitting diode (LED) is coupled direct to the local source of alternating current track circuit energy through a transformer, with a band pass filter tuned to track circuit frequency included in the transformer secondary connections to the LED. The LED responds to each positive half cycle of the local signal and is focused to illuminate a photo resistive cell (PRC) to actuate similar periodic reductions in its resistance. The PRC is coupled to the electrified track section rails through a saturable transformer to receive track circuit energy from the same source through the section rails. The LED and PRC function as a synchronous rectifier, when the local and track signals are of the same frequency and rela- tively in phase, to provide an averaged direct current signal component from the saturable transformer secondary to a biased direct current track relay, which picks up to indicate an unoccupied section and releases when the section is occupied or a broken rail occurs. The circuit arrangement rejects signals of propulsion power frequency and its harmonics and sharply attenuates the D. C. output if the inputs are out of phase beyond predetermined limits.
337438
American Standard Inc.
Fetherstonhaugh & Co.
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