JPS6031953Y2 - Signal power receiving device for track circuit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a signal power receiving device used for receiving AC signals passing through a track circuit constituted by rails and detecting a train traveling on a track circuit.

Figure 1 shows a constituent country showing a conventional example, in which an AC signal of a specific frequency f is transmitted from the boundary P□ to the track circuit between the boundary P□ and P2 in the track circuit 3 consisting of the rails 1.2 and 2 by the transmitter TX. At the same time, the receiver RX installed at the boundary P2 receives the inter-rail voltage generated by the AC signal. , 2 by the axle and lower the inter-rail voltage, this also lowers the output of the receiver RX, thereby reducing the boundary P1. It detects the presence of a train on the track circuit between P2 and controls signals, etc.

In addition, if there is a railroad crossing etc. between the boundary P□ and P2,
A loop-shaped detection coil PC is provided along the rails 1.2 to the detection point P3 where train detection is to be performed, and this detects the signal current of the AC signal passing through the rails 1 and 2, and the output is sent to the receiver RX3. Wait until the train is detected at point P3.
When the train passes through the detection point P3, the output of the detection coil pc decreases, and the output of the receiver RXs also decreases, thereby detecting the train entering the detection point P3 and controlling the circuit breaker etc.

However, the detection coil PC is a separate circuit from the rails 1 and 2, and the short-circuit effect caused by the axle does not directly affect the detection coil PC, so the number of short circuits will increase as chopper vehicles become more popular. The detection coil PC also detects the noise magnetic field from the vehicle, which tends to cause the receiver RX to
This has resulted in the drawback of malfunctioning.

The present invention aims to eliminate all of the above drawbacks of the conventional methods at once, and is an extremely ideal system that reliably detects the passing of a train at a detection point and does not cause malfunctions due to vehicle noise.
The present invention provides a signal power receiving device for a track circuit.

The details of the present invention will be explained below with reference to FIG. 2 showing an embodiment.

In the figure, a series circuit of a loop-shaped coil LC placed along between rails 1 and 2, a resistor R as a series impedance, and a DC blocking capacitor C is shown.
A bridge connection is made between the rails 1 and 2, and the arrangement of the coils L and C is such that the signal current is passing through the rails 1 and 2 and the current 11 passing through the coil ratio are in the same direction. .

Further, receivers RC1 and PC2 are provided with coils wound around the direction perpendicular to the rails 1 and 2, facing the rails 1 and 2 and the coil pressure portion along the rail 1°2. , As a result, the signal current is and the current n, which is the current 11 flowing through the coil multiplied by the number of coil turns, 19
] is detected, and the output of the sum of the components corresponding to each of these is provided to the receiver RXs.

Therefore, if the voltage applied to the receiver RXs is Vm, then the relationship is Vrnoc n@il+is- (1), and if the track voltage at 13 points is Vr, then the relationship is Vr=Roil, so the above relational expression is It is expressed as follows.

VmoC(n*Vr/R) +is...(2)
Here, the relationship of equation (2) is expressed as (nVr/R): 1s=2: 1...(3)
If the reference value for signal detection of the receiver RXs is set to a little less than Vml/3 when there is no train, even if the vehicle reaches the boundary P3 and the vehicle noise directly reaches pc, pc2 or the coil, the axle short circuit will not occur. Therefore, since Vr is almost 0, the receiver does not operate until the amount of noise is equal to the amount induced by is.

Also, even when the axle reaches the left end of the loop, the is component does not attenuate, so the receiver RXs detects the frequency f, and it is not until the axle crosses the power receivers RC, PC2 to the right that 1s= Q, the train will be detected, and a very clear boundary will be obtained.

Note that the value of the resistor R is selected and the current 11 is changed to the signal current is
If it is smaller than , the influence on the receiver RX side is ignored, and it becomes possible to provide signal receiving devices at multiple locations, such as on the approach side and exit side of a railroad crossing.

Furthermore, when the train reaches the detection point P3, the signal current is and the current 11 disappear due to the axle short circuit, so the power receiver PC
1. Due to the decrease in the output of PC2, the output of the receiver RXs also decreases, and a train is detected.

Nao, at this time, the noise current flowing to the coil LC due to vehicle noise is limited by the resistor R, so the normal current 1
1, and the winding status of the power receivers PC1 and PC2 makes it easy to detect the signal current is passing through the rails 1 and 2, but it is difficult to detect the vehicle noise from above. , malfunction of the receiver RXs due to vehicle noise is completely prevented.

In addition, if a DC component is not applied between the rails 1 and 2, the capacitor C may be omitted or an inductance or the like may be used as the series impedance, and the coil pressure is placed only on the rail 1 or 2 side. Accordingly, only one of the power receivers PC1 and PC2 may be used, and various modifications are possible.

As is clear from the above explanation, according to the present invention, trains can be detected reliably, malfunctions due to vehicle noise are completely eliminated, and there is no influence on other receivers, and signal power reception for track circuits is possible. It has great effects as a device.

[Brief explanation of the drawing]

FIG. 1 shows the constituent countries showing the conventional example, and FIG. 2 shows the constituent countries showing the embodiment of the present invention. 1.2...Rail, LC...Coil, R
...Resistor (series impedance), PCl,
PC2...Receiver 111, RXs...Receiver, is...Signal current, 11...Current.

Claims (1)

[Scope of utility model registration request] A series circuit consisting of a loop-shaped coil arranged so that the current flowing along the rail is in the same direction as a signal current passing through the rail and a series impedance, and connected between the rails by a bridge, and the rail. S゛It consists of a coil wound around a direction perpendicular to S, and is provided opposite to the rail and the portion along the rail of the loop-shaped coil, and carries a current flowing through the loop-shaped coil and a signal current passing through the rail. from a power receiver to be detected, and a receiver connected to the output of the power receiver and provided with a voltage indicated by the sum of a component corresponding to the current passing through the loop-shaped coil and a component corresponding to the signal current passing through the rail. A signal power receiving device for rail circuits characterized by: