| 摘要 |
A power supply vital monitor for track circuits for railway systems comprising a track segment (11), said track segment being separated from adjacent segments (12) by electric joints (2). Each track segment comprises a signal transmitting unit (3) and receiving units (4) for transmitting and receiving train presence detection signals and/or transmitting or receiving communication signals between the train (7) and the track segment (11). The transmitting unit (3) and receiving units (4) are connected to a common power supply line (5). To avoid an erroneous clearing of an occupied status caused by spurious signals on the power supply line affecting reception of the train detection signals, each receiving unit (4) comprises at least two parallel signal processing channels, a first (41) and a second (42) channel, which connects the receiver (411, 421) with the corresponding track circuit and with a power supply sensor (412, 422) connected to the power supply line (5). Switches enable and disable connections of the receivers to the corresponding track circuit and to the corresponding power supply sensor. |
