Failsafe train vehicle control signal threshold detector apparat

Details Failsafe train vehicle control signal threshold detector apparat Failsafe train vehicle control signal threshold detector apparat

1976-01-22

1981-01-27

Zazworsky, John

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

246 28F, 250551, 307311, 307363, H03K 5153, B61L 2106

Patent

active

042477905

ABSTRACT:
A more failsafe signal voltage threshold determining apparatus is disclosed for operation in a train vehicle control system, and which utilizes the forward voltage drop characteristic of an input light emitting diode of an optical isolator device as a train vehicle control signal threshold reference. The detector transistor of the optical isolator device provides an output control signal in response to an input train vehicle control signal applied to the light emitting diode which has a voltage level high enough to overcome the light emitting diode voltage drop.

REFERENCES:
patent: 3816745 (1974-06-01), Primm et al.
patent: 3826930 (1974-07-01), Perry
patent: 3925709 (1975-12-01), Mitchell et al.
patent: 3964041 (1976-06-01), Hinds
patent: 3995173 (1976-11-01), Sibley
patent: 3999133 (1976-12-01), Lee et al.

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