SU1662887A1 - Receiver for track circuit - Google Patents

Abstract

The invention relates to railway automation. The purpose of the invention is to increase reliability. The goal is achieved by the fact that the transformer 1 of the reference signal is connected to a traveling transformer 2 through a controlled amplifier with a transformer connection, having transistors 17, 18, capacitors 20, 16, a resistor 21 and transformer windings 19, which output through an integrator 11, generator 10 connected via transformer 6 with the actuating element 3. 1 Il.

Description

The invention relates to railway automation, in particular to rail track monitoring devices.

The purpose of the invention is to increase reliability.

The drawing shows a functional diagram of the track receiver for track circuits.

The track receiver contains a reference transformer 1, a track transformer 2, an actuating element 3 connected via integrator 4, rectifier 5, transformer 6, power amplifier 7 with a key amplifier 8 controlled by two inputs, the first p-p-p-p switch 9, a current generator 10, a second rectifier 11 with an integrator, and a first pnpn switch 12 connected to the secondary winding of the track transformer 2, shunted by the first capacitor 13, and to the secondary winding of the reference transformer 1, shunted by a second capacitor 14, moreover, the first output of the secondary winding is connected through the first resistor 15 to the first output

the third capacitor 16, the second output of which is connected to the common bus, the emitter of the first transistor 17, the collector of which is connected to the base of the second transistor 18. while its emitter is connected to the common bus and the collector is connected to the common bus through the fourth capacitor 20 and through the resistor 21 with the secondary winding of the reference transformer 1, as well as the output of the current generator 10 is connected to the emitter of the third transistor 22, through the fifth capacitor 23 is connected to the first terminals of the diode 24, the second terminal of which connected to a common bus and a resistor 25 connected to a power source 26 connected through the fourth resistor 27 to the base of the transistor 22 and the collector of the fourth transistor 28, whose base is connected to the collector of the third transistor 22, and the emitter through the fifth resistor 29 to the common bus 30 and the first input of the key amplifier 8 controlled by two inputs, the second input 31 of which is informational, and the output is connected to the power amplifier.

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The device works as follows.

A signal is supplied to the primary winding of the reference transformer, in frequency and phase under ideal conditions (R 1 Ohm / km), which coincides with the rail line condition monitoring signal (CRL) in normal mode. In the event that both signals are identical in shape and the QRL signal is of sufficient level, the controlled pnp switch produces high frequency signals at those times when the positive half-waves of the reference oscillation and the XLP signal coincide. The output is then rectified and integrated. At the same time, it has the following functional dependence (in a simplified form): Uu (t) 0.5-A-Ki Kix cos (po) + cos (2 (o t –b p0 L-)) where A is the amplitude coefficient;

Ki is the ratio of the shape of the reference signal;

Ka - the shape factor of the information signal;

p0 is the phase of the reference oscillation; - phase of the CRL signal. From the presented expression it is seen that the output signal has a constant component, depending on the amplitude of the interacting signals and the phase difference between them, and the variable component in ideal conditions, which is the double frequency of the QRL signal and the sum of the phases between the reference signal and the signal CRL

Constant constituent is useful. And the secondary product of multiplication — harmonics — is filtered out by means of an i capacitor at the output of the second rectifier 11. The pnpn switch circuit 12 of the body 12 is constructed so that it practically eliminates the occurrence of a dangerous situation, i.e. appearance at the output of a constant component with a nominal level. The signal is then fed to the input of a rectangular pulse generator based on a pnpnc switch with a timing circuit — a current generator 10, a capacitor 23, a diode 24, and a resistor 25.

The conditions for the occurrence of generation are such that it can occur only in a very narrow range of input currents. The latter are stabilized with the help of a current generator, which can be implemented on the basis of two field-effect transistors and a mode resistor. Thus, even if the appearance of a constant component from the emitter of the third transistor is possible, then the leakage resistance must be strictly determined value, equivalent to the resistance of the current generator in the operating mode. The likelihood of such a situation is very low, on the order of 0

Next, the high frequency signal is fed to the input of a controlled key amplifier. In the simplest case, this is the key on a single transistor with a resistor in its collector. 0 A feature of the proposed receiver is its universalization. The receiver can work both in rail chains intended for main transport and in branched rail chains. In the first case, the additional input 31 is connected to the power source 26, and the signal from the output of the pnpnc switch is supplied through a controlled amplifier and a power amplifier, as well as through a chain: transformer 6, rectifier 5 and integrator 4 to the input of the actuator. The latter may be an electronic circuit or a relay. In the 5th branch rail circuit, the logic input 31 is used to implement the branch control function. To do this, the output of one of the receivers is connected to input 31, and the output of the other to executive 0. Thus, when a mobile unit is driven to one of the control sections of a track circuit, one of the receivers is de-energized and the signal disappears at the output of the latter. five

Claims (1)

The invention of the track receiver for a track circuit comprising a reference signal transformer, the output of one of the windings of which is connected through one of the capacitors to one of the terminals of one of the windings of the track transformer, the integrators connected to the power supply generator, the output of which is connected one of the windings of the separating transformer, the other winding of which is connected to the input of the rectifier element, the output of which is connected to the executive element, characterized in that, in order to increase reliability, it equipped with an additional transformer, resistors and transistors, the emitter of one of which, connected to one of the plates of the other capacitor through one of the resistors, is connected to the second output of the first winding of the track transformer, the first output of the winding of the second capacitor and the collector of the second transistor, the base and emitter of which are connected respectively to the collector and the base of the first transistor, which connected to one of the terminals of one of the windings of an additional transformer, the other terminal of which is connected via the capacitor and another resistor to the first and atomic terminals of the first transformer of the operative signal, respectively, and the second winding of the additional transformer is connected to the generator input via one of the above integrators The output of which is connected to the emitter and collector of the third and fourth transistors, respectively, the base and emitter of the last of which are connected respectively to the call Ktorov and the base of the third transistor, the latter of which is connected via a third resistor - to the power source to which the collector of the fourth transistor is connected via the fourth resistor, g the collector of the fifth transistor — directly, the base of which is connected to the collector of the fourth transistor, and the emitter is connected through the fifth resistor to the power supply and one of the windings of 10 transformer, and between the emitter of the third transistor and the collector of the fifth transistor included; a third capacitor and another rectifier element connected in series, and between the 15 first rectifier element and the actuating element, the second integrator is included