Signal lighting circuit of railway train operation sand table LED model

Abstract

A signal lighting circuit of a railway train operation sand table LED model comprises a lamp filament relay and n signal lamp circuits. A coil of the lamp filament relay is respectively connected with the signal lamp circuits in series to be conducted with a power source by finishing the conversion of the signal lighting function and the interlocking logic function in the circuits, the resistance of the coil of the lamp filament relay ranges from 340 omega to 600 omega, and the exciting current of the coil of the lamp filament relay ranges from 20mA to 40mA. The structures of the n signal lamp circuits are the same, and each signal lamp circuit comprises a bulb loop and a bridge rectifier circuit. Each bulb loop comprises a capacitor, a resistor and a light emitting diode, wherein the resistor is connected with the light emitting diode in series and then is connected to the two ends of the capacitor in parallel, one input end of the bridge rectifier circuit is connected with a movable contact of the lamp filament relay, the other input end of the bridge rectifier circuit is connected with the power source, and a direct current output end of the bridge rectifier circuit is connected with the two ends of the capacitor. The signal lighting circuit of the railway train operation sand table LED model is low in energy consumption and failure rate, high in circuit reliability and capable of reducing maintenance workloads and space occupied by the circuits.

Description

technical field [0001] The invention relates to a control circuit technology of a railway traffic signal machine, in particular to a lighting circuit for a railway traffic sand table LED model signal machine. Background technique [0002] The training of railway signal professional and technical personnel requires the teaching equipment to be consistent with the equipment used on site as much as possible. The use of real railway signal machines is the best from the perspective of teaching, but this method requires a large investment and requires comparative Wide grounds. Therefore, railway colleges and universities that train railway professional and technical personnel generally train students for special types of railway work by building driving sand tables. At present, the lighting circuit of the railway sand table signal machine mainly adopts the following methods: [0003] Method 1: Sand table model signal machine using 12V or 24V light bulbs. [0004] In order to en...

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Problems solved by technology

The problems of this method are: first, the power consumed by the resistor is large, and the resistance heats up seriously; second, the heat generated by the bulb is enough to melt the lampshade of the signal machine, and the service life of the light bulb is relatively short, and the maintenance work of the sand table model signal machine volume increase

[0008] First of all, the current in the lighting circuit of the entire model signal machine still needs to reach about 100mA to make the filament relay pick up, and the high-power resistors connected in series still heat up severely;

[0009] Secondly, because the light-emitting diodes in the circuit need to withstand the negative half-cycle voltage of the alternating current, it is easy to cause the light-emitting diodes to be broken down by high voltage, resulting in short-circuit failure of the light-emitting diodes, which greatly shortens the service life of the light-emitting diodes;

[0010] Third, a resistor network is used to replace the light bulb. When the light-emitting diode is disconnected or short-circuited, because of the presence of the resistor network, there is still current flowing in the lighting circuit, and the filament relay will not fall, causing the filament relay to fail to supervise the signal lamp filament. Conforms to the "fail-safe" principle in railway signaling

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