CN215042804U

CN215042804U - High-voltage pulse track circuit and frequency shift coding signal superposition isolation circuit

Info

Publication number: CN215042804U
Application number: CN202121076705.3U
Authority: CN
Inventors: 季广港; 叶凯华; 刘建磊; 李正; 王永娟; 初广前
Original assignee: Shandong Jiaotong University
Current assignee: Shandong Jiaotong University
Priority date: 2021-05-19
Filing date: 2021-05-19
Publication date: 2021-12-07
Anticipated expiration: 2031-05-19

Abstract

The utility model discloses a high-voltage pulse track circuit and frequency shift coding signal superposition isolating circuit, including the track circuit in station, send out a yard equipment, high-voltage pulse transmission equipment and matching transformer, be provided with the signal isolating device who comprises arm-and-string arm between matching transformer and the track circuit in station, the arm-and-string is the circuit that leads to the low frequency and hinders the high frequency, and the arm-and-string is the circuit that leads to the high frequency and hinders the low frequency; and two ends of the parallel arm are connected to the secondary side of the matching transformer, one end of the parallel arm is connected with the high-voltage pulse signal receiving end, and the other end of the parallel arm is connected with the coding signal receiving end through the serial arm. The utility model discloses a stack isolation circuit has realized the isolation of high frequency coding signal and low frequency high voltage pulse signal, has solved the stack isolation problem of current high pressure asymmetric pulse track circuit and coding signal, has guaranteed track circuit's normal work, has guaranteed railway transportation production safety.

Description

High-voltage pulse track circuit and frequency shift coding signal superposition isolation circuit

Technical Field

The utility model relates to an isolating circuit, more specifically the theory that says so especially relates to a high-voltage pulse track circuit and frequency shift coding signal stack isolating circuit.

Background

The Track circuit (Track circuit) is a circuit formed by a steel rail line and steel rail insulation, is used for automatically and continuously detecting whether the line is occupied by rolling stock or not, is also used for transmitting train control information, and is an important component of an interlocking and train operation control system.

At present, most of track circuit systems in domestic electrified railway stations adopt 97 type 25Hz phase-sensitive track circuits, but the designed track circuit of the system has lower track surface voltage, and section steel rails with lower train running frequency are easy to rust, so that the track circuit is poor in shunting. Poor shunting can cause the serious problems that the driving safety is seriously affected, such as leaving a white light band, flashing red sections, occupying and losing trains, and the like.

The high-voltage asymmetric pulse track circuit system is adopted, the track surface pulse voltage is increased to be more than 200V and less than 500V, and the track surface oxidation film is broken down, so that the shunting problem of the track circuit can be solved. However, after the high-voltage asymmetric pulse track circuit system is adopted, the technical problem to be solved is how to superpose and isolate the low-frequency high-voltage pulse signal and the uninsulated frequency shift coded signal.

Disclosure of Invention

The utility model discloses an overcome above-mentioned technical problem's shortcoming, provide a high-voltage pulse track circuit and frequency shift coding signal stack isolating circuit.

The utility model discloses a high-voltage pulse track circuit and frequency shift coding signal superposition isolating circuit, including the track circuit in the station, send out a yard equipment, high-voltage pulse sending equipment and matching transformer, send out a yard equipment and be used for producing high frequency coding signal, high-voltage pulse generating equipment is used for producing low frequency high-voltage pulse signal, is provided with coding signal receiving terminal and high-voltage pulse signal receiving terminal on the track circuit in the station; the output ends of the code sending equipment and the high-voltage pulse generating equipment are connected to the primary side of the matching transformer; the method is characterized in that: a signal isolation device is arranged between the matching transformer and the in-station track circuit, the signal isolation device consists of a parallel arm and a serial arm, the parallel arm is a circuit which is connected with low frequency and high frequency, and the serial arm is a circuit which is connected with high frequency and low frequency; and two ends of the parallel arm are connected to the secondary side of the matching transformer, one end of the parallel arm is connected with a high-voltage pulse signal receiving end on the in-station track circuit, and the other end of the parallel arm is connected with a coding signal receiving end on the in-station track circuit through the serial arm.

The utility model discloses a high-voltage pulse track circuit and frequency shift coding signal stack isolating circuit, and the arm is inductance L1, the cluster arm is established ties by inductance L2 and electric capacity C1 and is constituteed.

The utility model discloses a high-voltage pulse track circuit and frequency shift coding signal stack isolating circuit, the output of sending a yard equipment and the side of matching the transformer establish ties before have electric capacity C3, and it has inductance L3 and electric capacity C2 to establish ties in proper order between high-voltage pulse generating equipment and the matching transformer.

The utility model discloses a high-voltage pulse track circuit and frequency shift code signal stack isolating circuit, send out a yard equipment and be used for producing the frequency and be 1700Hz, 2000Hz, 2300Hz or 2600 Hz's code signal, high-voltage pulse transmitting equipment is used for producing the frequency and is 3.25Hz-4 Hz's low frequency high-voltage pulse signal.

The utility model has the advantages that: the utility model discloses a high-voltage pulse track circuit and frequency shift coding signal superposition isolating circuit, through set up the signal isolating circuit that arm and cluster arm constitute between code sending equipment and high-voltage pulse transmitting equipment and the track circuit in station, make the high-frequency coding signal that code sending equipment produced can only pass through the cluster arm that leads to high frequency and hinders low frequency, input to the coding signal receiving terminal of track circuit in station, make high-voltage pulse transmitting equipment can only pass through the high frequency and hinder the high frequency and merge the arm, input to the high-voltage pulse signal receiving terminal of track circuit in station, in this way, the isolation of high-frequency coding signal and low-frequency high-voltage pulse signal has been realized, effective superposition and isolation of low-frequency high-voltage pulse signal and high-frequency coding signal has been guaranteed, the problem of superposition isolation of current high-voltage asymmetric pulse track circuit and coding signal has been solved, the normal work of track circuit has been guaranteed, the safety of railway transportation production is ensured.

Drawings

Fig. 1 is a schematic circuit diagram of the high-voltage pulse track circuit and the frequency shift coded signal superposition isolation circuit of the present invention.

In the figure: 1 track circuit in station, 2 code sending equipment, 3 high voltage pulse sending equipment, 4 matching transformers, 5 signal isolation devices, 6 serial arms, 7 parallel arms, 8 inductors L2, 9 capacitors C1, 10 inductors L1, 11 code signal receiving ends and 12 high voltage pulse signal receiving ends.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings and examples.

As shown in fig. 1, the circuit schematic diagram of the high-voltage pulse track circuit and the frequency shift coding signal superposition isolation circuit of the present invention is provided, which is composed of a track circuit 1 in the station, a code sending device 2, a high-voltage pulse sending device 3, a matching transformer 4 and a signal isolation device 5, wherein the code sending device 2 is used for generating high-frequency coding signals, such as coding signals with frequency of 1700Hz, 2000Hz, 2300Hz or 2600 Hz; the high-voltage pulse transmitting device 3 is used for generating a low-frequency high-voltage pulse signal with the frequency of 3.25Hz-4 Hz. The in-station track circuit 1 is provided with a coding signal receiving end 11 and a high-voltage pulse signal receiving end 12, the coding signal receiving end 11 is used for receiving coding signals sent by the code sending equipment 2, and the high-voltage pulse signal receiving end 12 is used for receiving high-voltage pulse signals sent by the high-voltage pulse sending equipment 3. The matching transformer 4 is an ideal transformer.

The output end of the code sending device 2 and the output end of the high-voltage pulse sending device 3 are connected to the primary side winding of the matching transformer 4, and the secondary side winding of the matching transformer 4 is connected with the coding signal receiving end 11 and the high-voltage pulse signal receiving end 12 on the in-station track circuit 1 through the signal isolation device 5. The signal isolation device 5 is composed of a parallel arm 7 passing low-frequency and high-frequency blocking and a series arm 6 passing high-frequency group low-frequency, the parallel arm 7 is shown as an inductor L1, and the series arm 6 is composed of a capacitor C1 and an inductor L2 which are connected in series. Two ends of an inductor L1 are connected to two ends of a secondary side winding of the matching transformer 4, one end of an inductor L1 is connected to a high-voltage pulse signal receiving end 12 on the in-station track circuit 1, and the other end of an inductor L1 is connected to a coding signal receiving end 11 of the in-station track circuit 1 through a capacitor C1 and an inductor L2 in sequence.

After the high-frequency coded signal output by the code transmitting device 2 is output by the matching voltage device 4, the high-frequency coded signal cannot pass through the parallel arm (inductor L1) because of its high inductance value, but in the series arm, the inductor L2 and the capacitor C1 connected in series form a series resonance circuit for the uninsulated frequency-shifted signal, and allow the high-frequency coded signal to pass through so as to transmit the signal to the coded signal receiving end 11 of the in-station track circuit 1. After the low-frequency high-voltage pulse signal generated by the high-voltage pulse transmitting device 3 is output through the matching transformer 4, in the signal isolating device 5, because the capacitance reactance value of the low-frequency high-voltage pulse signal is high and the inductance reactance value is low, the low-frequency high-voltage pulse signal can only pass through the inductor L1 and is blocked by the capacitor C1, and the low-frequency high-voltage pulse signal is input to the high-voltage pulse signal receiving end 12 of the inner track circuit 1.

A circuit of the code sending device 2 connected with the primary winding of the matching transformer 4 is provided with a capacitor C3, and a circuit of the high-voltage pulse sending device 3 connected with the primary winding of the matching transformer 4 is sequentially provided with an inductor L3 and a capacitor C3. Thus, the high-frequency coded signal emitted by the code transmitting device 2 can pass through the capacitor C3 but cannot pass through the inductor L3, so that the phenomenon of signal back flow can be prevented. Similarly, the high-voltage pulse signal from the high-voltage pulse transmitting device 3 can pass through the resonant circuit formed by L3 and C2, but cannot pass through the capacitor C3, thereby preventing the signal from flowing backward.

Claims

1. A high-voltage pulse track circuit and frequency shift coded signal superposition isolation circuit comprises an in-station track circuit (1), code sending equipment (2), high-voltage pulse sending equipment (3) and a matching transformer (4), wherein the code sending equipment is used for generating high-frequency coded signals, the high-voltage pulse generating equipment is used for generating low-frequency high-voltage pulse signals, and the in-station track circuit is provided with a coded signal receiving end (11) and a high-voltage pulse signal receiving end (12); the output ends of the code sending equipment and the high-voltage pulse generating equipment are connected to the primary side of the matching transformer; the method is characterized in that: a signal isolation device (5) is arranged between the matching transformer and the in-station track circuit, the signal isolation device is composed of a parallel arm (7) and a serial arm (6), the parallel arm is a circuit which passes low frequency and high frequency, and the serial arm is a circuit which passes high frequency and low frequency; and two ends of the parallel arm are connected to the secondary side of the matching transformer, one end of the parallel arm is connected with a high-voltage pulse signal receiving end (12) on the in-station track circuit, and the other end of the parallel arm is connected with a coding signal receiving end (11) on the in-station track circuit through the serial arm.

2. The high voltage pulse track circuit and frequency shifted coded signal superposition isolation circuit of claim 1, wherein: the parallel arm (7) is an inductor L1 (10), and the serial arm (6) is formed by connecting an inductor L2 (8) and a capacitor C1 (9) in series.

3. The high voltage pulse track circuit and frequency shift coded signal superposition isolation circuit according to claim 1 or 2, characterized in that: a capacitor C3 is connected in series between the output end of the code sending device (2) and the primary side of the matching transformer (4), and an inductor L3 and a capacitor C2 are sequentially connected in series between the high-voltage pulse generating device (3) and the matching transformer.

4. The high voltage pulse track circuit and frequency shift coded signal superposition isolation circuit according to claim 1 or 2, characterized in that: the code sending equipment (2) is used for generating code signals with the frequency of 1700Hz, 2000Hz, 2300Hz or 2600Hz, and the high-voltage pulse sending equipment (3) is used for generating low-frequency high-voltage pulse signals with the frequency of 3.25Hz-4 Hz.