SU1323447A1 - Alternating current rail circuit - Google Patents

Abstract

The invention relates to the field of railway automatics and telemechanics, namely to the primary sensors of information on the condition of the railway track. The chain of invention is increased reliability. The rail circuit contains a track receiver 2, 16 connected at one of its ends to the rail threads 1 (L

Description

13

a pulse width modulated modulator (PWM) whose output is connected to the primary winding 5.1 of the output transformer 5, the second 5.2 and third 5.3 windings of which are connected respectively to the key elements 6 and 7, the bridge inverter on the key elements 8, 9, 10, 11, in one diagonal of which the first winding of the supply transformer 12 is connected, the second winding of which is connected to the rail wires 1 connected to one of the terminals of the inductive voltage divider 13, the constant voltage source 14 connected to the second diagonal of the bridge inverter a, a current transformer 15, the first winding 15.1 of which is connected to the first PWM input and one output of saturation droplets 16.

one

The invention relates to railway automatics and telemechanics. Namely, to rail circuits. 1 The purpose of the inventive shadow is to increase reliability.

The drawing shows a circuit diagram of a track circuit.

The rail circuit contains track receiver 2 connected at one end to rail nit 1, a pulse-width modulator on transistors 3 and 4, made on the basis of a magnet-transistor multivibrator, an output transformer 5 with windings. 5.1-5.3, the second 5.2 and third 5.3 windings of which are connected respectively to the inputs of key elements 6 and 7, the bridge inverter, executed on the third 8, fourth 9, right 10 and sixth 11 key elements, in which one diagonal is included the first The windings of the supply transformer 12, the second winding of which is connected at the other end of the rail circuit to the rail yarn: 1, is connected to one of the terminals of the inductive voltage divider 13, the third and fourth windings of the transformer 12 are connected respectively to the inputs of the key elements 10 and 11, ist 14 chnik DC voltage n wp., connected to the second diagonal of the bridge INV

7

The second winding 15.2 is connected to the input of the miter 17, the output of the bridge inverter included in the circuit of the second diagonal. The device has an alternating voltage source 18, the output of which through the third winding 15.3 of the transformer 15 is connected to the input of the additional rectifier 19, the output of which is connected to another output of the voltage divider 13, another output of the winding 5.1 of the transformer 5 and the earthing switch 20. 18, the current in the winding 15.3 of the transformer 15 is inversely proportional to the resistance of the ballast between the middle terminal of the divider 13 and the grounding conductor 20. The oscillation failure threshold depends on this current and, therefore, on the resistance value of the ballast. 1 il.

O

0

..

0

Pa, a current transformer 15 with windings 15.1-15.3, the first winding 15.1 of which is connected to the first input of the pulse-width modulator and one pin of the saturation 16 throttles, the second winding 15.2 is connected to the input of the rectifier 17, the output of the second bridge diagonal connected to the circuit an inverter in series with the source 14. The device has an alternating voltage source 18, the output of which through the third winding 15.3 of the transformer 15 is connected to the input of an additional rectifier 19, the output of which is connected to another output of the voltage divider 13, another terminal of the winding 5.1 of the transformer 5 and the earthing device 20. The device has an additional transformer 21 with the windings 21.1-21.4, the winding 21.1 of which is connected to one of the outputs respectively of the outputs of the key elements 6.and 7 and the other output of the rectifier 17, the second 21.2 and the third 21.3 windings of the transformer 21 are connected respectively to the inputs of the key elements 8 and 9 of the bridge inverter, the fourth winding 21.4 of the transformer 21 is connected to the second input of the pulse-width modulator and the second terminal of the drosssel 16.

3

The device works as follows.

A sinusoidal voltage and are formed on the output winding of the source. On the winding 15.3 transformer 15 current flows I, equal to

I

where Z g is the ballast resistance between the average output of the voltage divider 13 and the ground wire 20.

On the windings 15.1 and 15.2 of the transformer 15, a voltage proportional to the current I is formed. The voltage U is used as a control voltage for the pulse-width modulator.

To supply the transformer 21c with intermediate key elements, 6 and 7, a voltage equal to the sum of the voltages U U, + Uj is used, where and is the voltage of the source 14; Uj is the voltage proportional to the current I, taken from the output of the additional rectifier 17. From the windings of the transformer 21 is the voltage U, and, proportional to the voltage .Ug, are fed to the inputs of the bridge inverter. A bridge inverter, made according to the scheme with semi-dependent excitation, has a threshold for breaking oscillations, i.e. the key elements 8, 9, 10 and 11 are in the off state, if the gain in the positive feedback loop is less than 1. Since the magnitude of the voltage and, J depends on I, the oscillation stall threshold also depends on I-, consequently, on the magnitude of the resistance of the ballast.

The choke 16 is supplied with the sum of the voltage of the first harmonic U,, vpyschePolanie track circuit with a direct voltage, the average value of a sinusoidal, and used to adjust the threshold stall

filter and voltage U-. . . „

,,, „,, at current with high speed

formed on the winding 21.4 trans - -i- "

allows to increase shunt sensitivity.

U ", 4 +

and ,, under deyformatrra 21, i.e. By which the core is switched from one inductance value to another.

After saturation of the core of the throttle 16, the switching of the transistors 3 and 4 takes place, and the voltage, U, is applied to the choke 16. t under the action of which the core re-ripens. After remagnetizing the core of the throttle, the transistors 3 and 4 are switched, then the process repeats.

As a result, the windings 5.2 and 5.3 of the transformer 5 generate voltages and

5.-1

and and.

5J that arrive

to control the keys 6 and 7, as a result of switching on the windings 21.2 and 21.3 respectively of the transformer 21, voltage pulses Uj ,, 2 21.3 ° of the pulse duration repeating voltages U. are formed,

fO and

.

and amplitude proportional

five

0

voltage Ug.

By switching the transistors of the bridge inverter 8, 9, 10, and 11 on the winding of the transformer 12, a voltage U proportional to the voltage U, the source 14, repeating voltage and, for the duration of the pulses, is proportional to. 5.3- If the voltage of the UK source 14 is proportional to ",

0 and the voltage U is proportional to the current I, then the average value of the voltage during the modulation period is inversely proportional to the value of the ballast resistance. In addition, it is proportional to the voltage U of source 18. And if qc varies sinusoidally, then the average value to which track 2 reacts also varies sinusoidally.

0, the magnitude of the stall current also depends on the magnitude of the resistance of the ballast. Obtaining information about the magnitude of the resistance of the ballast is performed at a constant frequency, which increases the reliability and, therefore, reliability. Turning on the power of the pulse-width modulator from the output of the rectifier 19 allows the rectifier failure to also be made safe.

The power of the track circuit is a rectangular voltage, the average value of which is sinusoidal, and used to adjust the breakdown threshold

 „

  -i- "

allows to increase shunt sensitivity.

Claims (1)

Invention Formula An AC rail circuit containing a track receiver connected to the rail line at one end, and a transmitter at the other end having a current transformer connected to one of the inputs of a pulse-width modulator, a video inverter, in one diagonal of which one of the supply windings is connected transformer, the second winding of which is under 513234476 The other is connected to the rails, and another diago-pulse-width modulator, the second bridge inverter is switched on, a third winding is connected, parallel to each constant voltage point, of which a key element is included, which is it is connected to the input of the bridge with an inverter of improved reliability, it supplies 5Pa, and the fourth winding is supplemented with key elements and an additional transformer is connected to the secondary transformer, one of the circular input of which the pulse-width modulator is connected to exit torus. Compiled by S.Shurygin Editor I.Rybchenko Tehred N.Glushchenko Proofreader S.Cherni Order 2922/23 Circulation 455 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4