COMPENSATOR FOR HARMONIC INTERFERENCE IN A LOW-FREQUENCY SIGNAL Russian patent published in 2023 - IPC B61L25/06 B61L3/24 H04B15/00 

FIELD: railway transport.

SUBSTANCE: means for compensating for interference in the signal of track circuits or automatic locomotive signaling. Compensator for harmonic interference in a low-frequency signal contains a notch filter that suppresses a signal voltage with a frequency of 25 and/or 75 Hz, an amplifier with adjustable gain and a three-winding transformer, the two primary windings of which have the same number of turns and are connected in opposite directions. The notch filter is made in the form of an inductor and a capacitor connected in parallel. In this case, the secondary winding of the isolation transformer of the track circuit or the output of the receiving locomotive coils of the automatic locomotive signaling is connected to one input winding of the three-winding transformer and is connected to the second input winding of the three-winding transformer through a notch filter and an amplifier with adjustable gain. The output winding of the transformer is connected to the input of the signal receiver.

EFFECT: increasing the noise immunity of track circuit receivers and automatic locomotive signaling.

1 cl, 1 dwg