DEVICE TO CONTROL TRACK UNOCCUPANCY Russian patent published in 2012 - IPC B61L23/16 

FIELD: transport.

SUBSTANCE: invention relates to railway equipment, namely, to railroad ACS and telemetry hardware and be used for traffic control. Proposed device comprises signal frequency generator, current limiter, two filters, two track transformers, two rectifiers, two ADCs, two PROMs, clock pulse generator, two logical elements AND, register, comparator and track line. Additionally, two smoothing filters and trigger are used. Signal frequency generator output is connected via current limiter, first filter and first track transformer with one end of track line. Second end of track line is connected via second track transformer, first rectifier and first smoothing filter with input of first ADC with its output connected with comparator A-input, register D-input and first PROM A-input. PROM B-input is connected via second rectifier, second smoothing filter and second ADC with current limiter output terminals while its output is connected with input of first logical element AND and trigger S-input. Trigger R-input is connected with first AND element output while trigger output is connected with second input of second AND element. Second AND element first input is connected with clock generator output and its output is connected with trigger C-input. Register output is connected with input of second PROM with its output connected with comparator B-input. Comparator output is connected with first input of first AND element.

EFFECT: higher reliability of track state control.

1 dwg