DEVICE TO CONTROL TRACK UNOCCUPANCY Russian patent published in 2011 - IPC B61L23/16 

FIELD: transport.

SUBSTANCE: first clearing unit and first occupancy unit are connected via matching transformer and first band filter to tail circuit supply end, filet output being connected with generator via resistor. First rectifier, first smoothing filter, and first ADC are interconnected in series and connected in parallel with resistor to form first signal converter. First signal converter output is connected with input B of first comparator with its input A connected to threshold voltage setting unit and its output connected and input S of trigger. Trigger input R is connected to second clearing unit via second comparator output and trigger output is connected to generator and second clearing unit via one-shot. Track line receiving end is connected via second matching transformer ro second occupancy unit and second clearing unit via second band filter. Output of second band filter is interconnected in series with second rectifier, second smoothing filter, second ADC to produce second signal converter. The latter has its output connected with input A of PROM and input B of second comparator. Second comparator input A is connected to PROM output. PROM input C is connected to one-shot.

EFFECT: higher shut sensitivity and reduced power consumption.

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