TRACK CIRCUIT Russian patent published in 2008 - IPC B61L23/16 

FIELD: transportation.

SUBSTANCE: track circuit incorporates a track generator, the first and the second coupling devices, the first and the second rectifiers, the first and the second programmable permanent memories, a register, the first and the second AND logical elements, the first and the second analog-digital converters, a track line and clock-pulse oscillator. The track circuit is furnished additionally with the second track line, the third coupling element, the third and fourth programmable permanent memories, the second, the third and the fourth registers, the first, the second and the third comparators, the first, the second, the third, the fourth and the fifth triggers, the third and the fourth AND logical elements, NO logical element, rear contact of the previous track circuit relay, track relay of the tract circuit under consideration and its front contact and a button. The receiver elements compare the voltage at the ends. The track circuit seizing is fixed at voltage decrease at the input track circuit receiver end relative to output track circuit making FS (factor of seizing) times, while the circuit clearing is fixed at voltage decrease at the output track circuit receiver end relative to the voltage at the input circuit receiver end making 1/FS times, as well as in the subsequent output track line receiver voltage increase and attainment of approximate equality of voltages of the track line receiver ends.

EFFECT: higher reliability of the track circuit operation.

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