Dual-computer combined phase-sensitive track circuit receiver

Abstract

The utility model relates to a dual-computer combined type phase-sensitive track circuit receiver, which comprises a first receiver and a second receiver, and the first receiver and the second receiver are respectively provided with a main receiver circuit and a standby receiver circuit which are the same. Signals of the first track section are respectively connected with a main receiver circuit in the first receiver and a standby receiver circuit in the second receiver, and signals of the second track section are respectively connected with a main receiver circuit in the second receiver and a standby receiver circuit in the first receiver. According to the utility model, a '0.5 + 0.5 'redundancy design thought is adopted, a double-machine simultaneous-use structure is adopted, two sets of independent circuits are arranged in one receiver, a processing circuit is responsible for processing respective input signals, and when the idle condition of a track section is met, the receiver drives a track relay to be sucked up through a safety driving circuit and output. According to the redundancy scheme, the number of receivers used in each track section can be reduced by 50%, and therefore the construction cost is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of railway signals, and in particular relates to a dual-machine phase-sensitive track circuit receiver. Background Art

[0002] There are two types of track receivers that are widely used at present. One is a single-set type, specifically one is installed at the receiving end of one track section. The advantages are low construction investment and low cost. The disadvantage is that once a component fails, it will cause a track circuit failure and no alarm function. The other is a dual-set type, which adopts the "1+1" redundancy method. At one track section receiving end, a dual-machine parallel operation mode is adopted. Under normal circumstances, both sets of receivers receive and process input signals and jointly drive the track relay. The advantage of the "1+1" redundancy method is high reliability. If any device in the host or standby machine fails, it will not affect the normal operation of the overall system, nor will it occupy the redundant resources of other systems. It has an alarm function, but the disadvantage is that the equipment investment cost is high, and the number of equipment is doubled, which is costly. Utility Model Content

[0003] In view of this, the purpose of the utility model is to overcome the deficiencies of the prior art and provide a dual-machine phase-sensitive track circuit receiver to solve the problem of high cost of the existing dual-machine phase-sensitive track circuit receiver.

[0004] To achieve the above objectives, the utility model adopts the following technical solutions: a dual-machine phase-sensitive track circuit receiver, comprising: a first receiver and a second receiver, wherein the first receiver and the second receiver are both provided with the same main receiver circuit and backup receiver circuit, the signal of the first track section is respectively connected to the main receiver circuit in the first receiver and the backup receiver circuit in the second receiver, and the signal of the second track section is respectively connected to the main receiver circuit in the second receiver and the backup receiver circuit in the first receiver; the main receiver circuit output of the first receiver and the backup connector circuit output of the second receiver are connected to the first track relay, and the main receiver circuit output of the second receiver and the backup receiver circuit output of the first receiver are connected to the second track relay;

[0005] Among them, the main receiver circuit and the backup receiver circuit both include: a track signal sampling circuit, a local signal sampling circuit, a processing circuit, a drive output circuit, an output detection circuit, a display circuit and an alarm circuit; the output end of the track signal sampling circuit and the output end of the local signal sampling circuit are respectively connected to the input end of the processing circuit, and the output end of the processing circuit is respectively connected to the display circuit and the input end of the drive output circuit; the output end of the drive output circuit is respectively connected to the alarm circuit and the output detection circuit, and the output detection circuit is also connected to the processing circuit.

[0006] Furthermore, it also includes:

[0007] Track input isolation circuit, used for electromagnetically isolating the received track signal;

[0008] A local input isolation circuit is used to perform electromagnetic isolation on the received local signal;

[0009] The output end of the track input isolation circuit is connected to the input end of the track signal sampling circuit, and the output end of the local input isolation circuit is connected to the input end of the local signal sampling circuit.

[0010] Furthermore, it also includes:

[0011] A filtering circuit and a signal amplifying circuit; the filtering circuit is used to filter the sampled signal, and the signal amplifying circuit is used to amplify the filtered signal;

[0012] The input end of the filtering circuit is respectively connected to the output end of the track signal sampling circuit and the output end of the local signal sampling circuit, the output end of the filtering circuit is connected to the input end of the signal amplifying circuit, and the output end of the signal amplifying circuit is connected to the processing circuit.

[0013] Furthermore, it also includes:

[0014] Track input lightning protection circuit, used to protect the track from input lightning and surge;

[0015] The input end of the track input lightning protection circuit is connected to the track voltage output circuit, and the output end thereof is connected to the input end of the track signal sampling circuit.

[0016] Furthermore, it also includes:

[0017] a power supply circuit, used for providing electrical energy to the processing circuit;

[0018] The power supply circuit is connected to the processing circuit.

[0019] Furthermore, it also includes:

[0020] Anti-reverse connection circuit, used to disconnect the power circuit when the power is reversely connected;

[0021] The input end of the anti-reverse connection circuit is connected to the output end of the power supply circuit, and the output end of the anti-reverse connection circuit is connected to the input end of the processing circuit.

[0022] Furthermore, it also includes:

[0023] A / D conversion circuit, used for converting the received pulse voltage signal into a digital signal;

[0024] The input end of the A / D conversion circuit is connected to the input end of the signal amplification circuit, and the output end of the A / D conversion circuit is connected to the input end of the processing circuit.

[0025] Furthermore, the display circuit includes:

[0026] Digital display for showing rail voltage amplitude and phase angle.

[0027] Furthermore, the processing circuit adopts a single chip microcomputer.

[0028] Furthermore, the single chip microcomputer adopts a DSP chip.

[0029] The utility model adopts the above technical solution, and the beneficial effects that can be achieved include:

[0030] The embodiment of the present application provides a dual-machine phase-sensitive track circuit receiver, which adopts a "0.5+0.5" redundancy scheme. Each receiver can detect the track signal and local signal of two track sections at the same time. As long as one set of circuits in the two receivers can work normally, it can drive the track relays of the two track sections to operate, which can reduce the number of receivers used in each track section by 50%, thereby reducing construction costs. When any set of circuits in the two receivers fails, an alarm can be issued through the self-test function of the receiver to remind maintenance personnel to replace the faulty receiver in time, thereby improving the overall reliability of the track circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 This is a schematic diagram of the structure of a dual-machine phase-sensitive track circuit receiver of the utility model. Figure 1 ;

[0033] Figure 2 A schematic diagram of the structure of the main receiver circuit and the backup receiver provided by the utility model;

[0034] Figure 3 This is a schematic diagram of the structure of a dual-machine phase-sensitive track circuit receiver of the utility model. Figure 2 . DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the utility model.

[0036] The existing track receivers have the following problems:

[0037] (1) Existing track receivers all use single-chip microcomputers to process information and use a voltage-boosting method to sample and process the input signal. Although this improves the signal strength, it is not conducive to preventing the input high voltage from damaging the receiver.

[0038] (2) Existing receivers are unable to display track voltage values, phase angles and other parameters in real time.

[0039] (3) Existing receivers use a capacitor charging and discharging method to generate measurement pulses for the track voltage and rely on statistics of the number of pulse inputs to determine the input voltage value. This method is easily affected by the characteristic parameters of electronic components and there are individual differences during production, so manual adjustment of the receiving sensitivity is required.

[0040] (4) When using the measurement pulses generated above to calculate the phase angle, it is easily affected by the differences in performance parameters of devices such as capacitors and resistors, resulting in large phase angle measurement errors and poor anti-interference performance. When there is a large 50Hz voltage interference in the 25Hz signal, the waveform is distorted, which will cause large measurement errors.

[0041] (5) The existing receiver cannot accurately measure the phase angle, so it is not possible to cut off the output drive and cause the track relay to fall when the phase angle exceeds the specified range.

[0042] A specific dual-machine phase-sensitive track circuit receiver provided in an embodiment of the present application is described below in conjunction with the accompanying drawings.

[0043] like Figure 1As shown, the utility model provides a dual-machine phase-sensitive track circuit receiver, including: a first receiver 11 and a second receiver 12, wherein the first receiver 11 and the second receiver 12 are both provided with the same main receiver circuit and backup receiver circuit, the signal of the first track section is respectively connected to the main receiver circuit 111 in the first receiver 11 and the backup receiver circuit 121 in the second receiver 12, and the signal of the second track section is respectively connected to the main receiver circuit 122 in the second receiver 12 and the backup receiver circuit 112 in the first receiver 11; the output of the main receiver circuit 111 of the first receiver 11 and the output of the backup connector circuit 121 in the second receiver 12 are connected to the first track relay 13, and the output of the main receiver circuit 122 of the second receiver 12 and the output of the backup receiver circuit 112 in the first receiver 11 are connected to the second track relay 14;

[0044] Among them, Figure 2 As shown, the main receiver circuit and the backup receiver circuit both include: a track signal sampling circuit 1, a local signal sampling circuit 2, a processing circuit 3, a drive output circuit 4, a display circuit 5, an output detection circuit 6 and an alarm circuit 7; the output end of the track signal sampling circuit 1 and the output end of the local signal sampling circuit 2 are respectively connected to the input end of the processing circuit 3, and the output end of the processing circuit 3 is respectively connected to the input end of the display circuit 5 and the drive output circuit 4; the output end of the drive output circuit 4 is respectively connected to the alarm circuit 7 and the output detection circuit 6, and the output detection circuit 6 is also connected to the processing circuit 3.

[0045] It is understandable that if Figure 3 The figure shows the schematic diagram of the dual-machine structure of the track receiver.

[0046] In the present application, each receiver can detect the track signals and local signals of two track sections at the same time, and adopts the "0.5+0.5" redundancy scheme. As long as one set of circuits in the two receivers can work normally, it can drive the track relays of the two track sections to operate. The track signals of the two sections can be detected, and the two independent circuits work separately during operation. When one set of receiver circuit fails, it will not affect the normal operation of the other set. Compared with the current "1+1" redundancy scheme for receivers, the redundancy scheme of the dual-machine phase-sensitive track circuit receiver provided in the present application can reduce the number of receivers used in each track section by 50%, thereby reducing construction costs.

[0047] Specifically, the track signal sampling circuit 1 provided in the present application utilizes the sampling zero-crossing technology and the signal generated by the zero-crossing to generate a track pulse signal consistent with the input track signal, that is, when the track pulse signal is in the positive half cycle, a high-level signal is generated, and when the track voltage is in the negative half cycle, a low-level signal is generated. The track signal AC frequency can be calculated by sampling the rising edge and the falling edge of the pulse. The track signal sampling circuit 1 of the present application adopts a method of capturing the pulse edge. If there is no pulse edge, the sampling process cannot be realized, thereby realizing reliable detection of the input track signal. In addition, the zero-crossing signal in the present application also generates an analog voltage signal that changes proportionally with the input track signal voltage value. By sampling this voltage value, the effective value of the voltage of the input track signal at this time can be calculated, that is, the track signal sampling circuit 1 provided in the present application generates two sampling signals, namely the track pulse signal and the track analog voltage signal.

[0048] The local signal sampling circuit 2 provided in the present application is used to implement sampling of the local pulse signal after the local signal is converted. In the present application, due to the volume limitation of the circuit board, only the pulse moment sampling of the local signal is implemented.

[0049] The processing circuit 3 provided in the present application adopts a single chip microcomputer, which converts the input 25Hz track pulse signal and the local pulse signal into digital signals through an analog-to-digital converter, analyzes and processes the converted digital signals, calculates the amplitude of the 25Hz signal input by the track and the phase difference between the track signal and the local signal, and displays the calculation result through the display circuit 5 after the calculation by the single chip microcomputer, and then sends the calculation result to the drive output circuit 4;

[0050] The drive output circuit 4 is periodically turned on and off according to the logic signal of the operation result, realizes DC / DC power conversion, and outputs the drive relay signal. It should be noted that in the present application, the drive output circuit 4 can only be turned on and off to realize DC / DC power conversion and output the drive relay signal when the logic signal received is an alternating pulse signal. This ensures that when the microcontroller pin is in an out-of-control state, it is always in a cut-off state and cannot output the drive relay signal.

[0051] The display circuit 5 is used to display the working status of the receiver itself and the occupied and idle status of the track section processed by the receiver, and to display the phase difference between the track signal and the local signal, that is, the phase angle, and the effective value of the track voltage, that is, the track voltage amplitude.

[0052] The output detection circuit 6 in the present application can obtain the logic signal output by the microcontroller, and can also determine whether the drive output circuit 4 receives the logic signal. If the output detection circuit 6 detects that the microcontroller outputs a logic signal, but the drive output circuit 4 does not receive the logic signal, it means that the microcontroller has a fault, and the output detection circuit 6 generates an alarm signal. It should be noted that the drive output circuit 4 in the present application adopts a guided safety design. When the microcontroller fails, the drive relay signal cannot be output regardless of whether the output pin is in a high level state or a low level state.

[0053] In the present application, after the output detection circuit 6 generates an alarm signal, it is fed back to the drive output circuit 4, and the drive output circuit 4 outputs the alarm signal to the alarm circuit 7, and the alarm circuit 7 issues an alarm.

[0054] Specifically, the present application uses an output detection circuit 6 to detect whether the DC drive output by the receiver is working normally. The drive output signal is fed back to the input pin of the single-chip microcomputer, and the feedback signal can be used to determine whether the current logic signal has taken effect. If the single-chip microcomputer has generated a logic signal as a control output signal, but the drive output end cannot detect the logic signal, the output detection circuit 6 generates an alarm signal and feeds it back to the drive output circuit 4, and the drive output circuit 4 sends the alarm signal to the alarm circuit 7 for alarm processing. Thereby ensuring that when the single-chip microcomputer is interfered with and freezes or has no output signal, the drive signal of the output drive relay is cut off, thereby realizing fault safety guidance. Through the alarm, the staff is notified in time to detect and process the dual-machine phase-sensitive track receiver to ensure the normal operation of the track. The dual-machine phase-sensitive track receiver provided in the present application adopts a DSP chip, and uses the signal sampling, analysis and processing functions of the DSP chip to realize the calculation and processing of the track signal, local signal, and phase of the phase-sensitive track circuit, thereby enhancing the signal processing capability and anti-interference capability of the receiver.

[0055] It is understandable that the alarm circuit 7 in the present application can be provided on the alarm box using an alarm indicator light or an alarm light. For example, a green light, a red light and a yellow light are used, and the green light indicates that the track is in an idle state. The red light indicates that the track is in an occupied state. The yellow light indicates that the monitored track voltage and phase angle value are not within the set range or the single-chip microcomputer fails, that is, an abnormality occurs, and the yellow light is on to warn.

[0056] The present application provides a dual-machine phase-sensitive track circuit receiver, which samples the track pulse signal and analog voltage signal after the track signal is converted through a track signal sampling circuit 1, and samples the local pulse signal after the local signal is converted through a local signal sampling circuit 2. The processing circuit 3 calculates the track voltage amplitude according to the track analog voltage signal, and can also calculate the phase angle according to the track pulse signal and the local pulse signal to generate a logic signal. The display circuit 5 can display the track voltage amplitude and phase angle. The drive output circuit 4 outputs a drive signal according to the logic signal to drive a relay connected to the dual-machine phase-sensitive track receiver.

[0057] In the technical solution provided by this application, when any circuit of the two receivers fails, the self-check function of the receiver can send out an alarm to remind maintenance personnel to replace the faulty receiver in time, thereby improving the overall reliability of the track circuit. According to the functions and characteristics of the new track receiver, the number of existing receivers and track racks can be reduced, and indoor wiring can be greatly reduced. Preliminary analysis shows that the construction cost can be saved by about 20%.

[0058] The dual-machine phase-sensitive track receiver provided in the present application greatly improves the reliability and anti-interference ability of the track circuit. The dual-machine phase-sensitive track receiver can realize real-time online measurement of the receiver's track voltage and phase angle, which is beneficial to the adjustment of the track circuit, improves the efficiency of operation and maintenance, reduces the labor intensity of maintenance personnel, ensures the safe and punctual arrival of the railway, and safeguards the safety of railway transportation.

[0059] In addition, the track receiver in this application uses a DSP chip to analyze and process the track signal, local signal, and phase calculation of the phase-sensitive track circuit, thereby improving the data processing capability and anti-interference capability of the receiver; the newly developed receiver has added a self-detection function for receiver faults, track voltage, phase angle, and output voltage display functions on the basis of the existing receiver functions; the electromagnetic compatibility and anti-interference design are optimized to improve the overall reliability of the track circuit.

[0060] In some optional embodiments, the dual-machine phase-sensitive track circuit receiver provided by the present application further includes:

[0061] A track input isolation circuit (not shown in the figure), used for electromagnetically isolating the received track signal;

[0062] A local input isolation circuit (not shown in the figure) is used to perform electromagnetic isolation on the received local signal;

[0063] The output end of the track input isolation circuit is connected to the input end of the track signal sampling circuit 1 , and the output end of the local input isolation circuit is connected to the input end of the local signal sampling circuit 2 .

[0064] Specifically, in the present application, the track input isolation circuit electromagnetically isolates the received track signal, and the local input isolation circuit electromagnetically isolates the received local signal. It can be understood that both the track input isolation circuit and the local input isolation circuit are provided with an isolation transformer. The isolation transformer electromagnetically isolates the track signal and the local signal from the processing circuit 3. The isolation transformer adopts a step-down method. When the input signal has a large impact or interference, it is attenuated by the isolation transformer, and the signal loaded on the processing circuit 3 will be attenuated, thereby protecting the processing circuit 3.

[0065] The track signal and local signal after the isolation transformer use zero-crossing technology to generate two pulse signals respectively, which are input to the microcontroller pin with input capture function, so that the occurrence time of the rising edge or falling edge of the signal can be collected. According to the capture time interval, the time interval between the track signal and the local signal is calculated, and the corresponding phase angle information is calculated through the time interval. Dual-machine phase-sensitive track circuit receiver,

[0066] In some embodiments, the dual-machine phase-sensitive track circuit receiver provided by the present application further includes:

[0067] A filtering circuit (not shown in the figure) and a signal amplifying circuit (not shown in the figure); the filtering circuit is used to filter the sampled signal, and the signal amplifying circuit is used to amplify the filtered signal;

[0068] The input end of the filtering circuit is respectively connected to the output end of the track signal sampling circuit 1 and the output end of the local signal sampling circuit 2, the output end of the filtering circuit is connected to the input end of the signal amplifying circuit, and the output end of the signal amplifying circuit is connected to the processing circuit 3.

[0069] Specifically, the present application can use a track filter circuit to filter the sampled track signal, use a local filter circuit to filter the sampled local signal to remove noise signals, and then amplify the filtered signal through a signal amplification circuit to ensure the stability of voltage signal transmission.

[0070] In some optional embodiments, the dual-machine phase-sensitive track receiver provided by the present application further includes:

[0071] Track input lightning protection circuit (not shown in the figure), used to protect the track from input lightning and surge;

[0072] The input end of the track input lightning protection circuit is connected to the track voltage output circuit, and the output end thereof is connected to the input end of the track signal sampling circuit 1 .

[0073] Specifically, the rail input lightning protection circuit in the present application adopts a high-power bidirectional transient lightning arrester to achieve protection against input lightning and surges.

[0074] In some optional embodiments, the dual-machine phase-sensitive track receiver provided by the present application further includes:

[0075] A power supply circuit 8, used for providing electric energy to the processing circuit 3;

[0076] The power supply circuit 8 is connected to the processing circuit 3 .

[0077] Specifically, the power supply circuit 8 in the present application outputs a stable 5V working power supply, which is only used for the single-chip microcomputer and its peripheral auxiliary circuits.

[0078] In some optional embodiments, the dual-machine phase-sensitive track receiver provided by the present application further includes:

[0079] An anti-reverse connection circuit (not shown in the figure), used to disconnect the power circuit 8 when the power supply is reversely connected;

[0080] The input end of the anti-reverse connection circuit is connected to the output end of the power supply circuit 8 , and the output end thereof is connected to the input end of the processing circuit 3 .

[0081] In the present application, a reverse polarity protection circuit is connected to the positive end of the power supply, and the reverse polarity protection circuit adopts a unidirectional conducting diode; the unidirectional conducting diode is used to disconnect the working power supply circuit when the working power supply is reversely connected, thereby realizing the reverse polarity protection of the power supply.

[0082] In some optional embodiments, the dual-machine phase-sensitive track receiver provided by the present application further includes:

[0083] A / D conversion circuit (not shown in the figure), used for converting the received pulse voltage signal into a digital signal;

[0084] The input end of the A / D conversion circuit is connected to the input end of the signal amplification circuit, and the output end of the A / D conversion circuit is connected to the input end of the processing circuit 3 .

[0085] Specifically, the A / D conversion circuit converts the input 25Hz track and local analog signals into digital signals through an analog-to-digital converter, and then the processing circuit analyzes and processes the converted digital signals to calculate the amplitude of the 25Hz signal of the track input and the phase difference between the track signal and the local signal.

[0086] In some optional embodiments, the display circuit 5 includes:

[0087] A digital display (not shown in the figure) is used to display the track voltage amplitude and phase angle.

[0088] The staff can observe the measured value, effective value, local voltage and phase angle of the track receiving end relay voltage at any time through the digital display, which is convenient for the staff to supervise the working condition of the track circuit and improve work efficiency.

[0089] In summary, the dual-machine phase-sensitive track circuit receiver provided by the present application can detect track signals in the same section at the same time when in use, forming a "two-out-of-two" redundant structure, and can also detect track signals in two sections. When working, two sets of independent circuits work separately. When one set fails, it does not affect the normal operation of the other set. Compared with the "1+1" redundancy scheme of existing track receivers, the use of the redundant structure of the new track receiver can reduce the number of receivers used in each track section by 50%, thereby reducing construction costs.

[0090] In addition, the receiver circuit in the present application uses a DSP chip to analyze and process the track signal, local signal, and phase calculation of the phase-sensitive track circuit, thereby improving the data processing capability and anti-interference capability of the dual-machine phase-sensitive track receiver; the dual-machine phase-sensitive track receiver has added a self-detection function for receiver faults, track voltage, phase angle, and output voltage display function on the basis of existing receiver functions; the electromagnetic compatibility and anti-interference design are optimized to improve the overall reliability of the track circuit.

[0091] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A dual-unit phase-sensitive track circuit receiver, characterized in that: include: a first receiver and a second receiver, wherein the first receiver and the second receiver are both provided with the same main receiver circuit and backup receiver circuit, the signal of the first track section is respectively connected to the main receiver circuit in the first receiver and the backup receiver circuit in the second receiver, and the signal of the second track section is respectively connected to the main receiver circuit in the second receiver and the backup receiver circuit in the first receiver; The main receiver circuit output of the first receiver and the spare connector circuit output in the second receiver are connected to a first track relay, and the main receiver circuit output of the second receiver and the spare receiver circuit output in the first receiver are connected to a second track relay; Among them, the main receiver circuit and the backup receiver circuit both include: a track signal sampling circuit, a local signal sampling circuit, a processing circuit, a drive output circuit, an output detection circuit, a display circuit and an alarm circuit; the output end of the track signal sampling circuit and the output end of the local signal sampling circuit are respectively connected to the input end of the processing circuit, and the output end of the processing circuit is respectively connected to the display circuit and the input end of the drive output circuit; the output end of the drive output circuit is respectively connected to the alarm circuit and the output detection circuit, and the output detection circuit is also connected to the processing circuit.

2. The dual-unit phase-sensitive track circuit receiver according to claim 1 is characterized in that: Also includes: Track input isolation circuit, used for electromagnetically isolating the received track signal; A local input isolation circuit is used to perform electromagnetic isolation on the received local signal; The output end of the track input isolation circuit is connected to the input end of the track signal sampling circuit, and the output end of the local input isolation circuit is connected to the input end of the local signal sampling circuit.

3. The dual-unit phase-sensitive track circuit receiver according to claim 1 is characterized in that: Also includes: A filtering circuit and a signal amplifying circuit; the filtering circuit is used to filter the sampled signal, and the signal amplifying circuit is used to amplify the filtered signal; The input end of the filtering circuit is respectively connected to the output end of the track signal sampling circuit and the output end of the local signal sampling circuit, the output end of the filtering circuit is connected to the input end of the signal amplifying circuit, and the output end of the signal amplifying circuit is connected to the processing circuit.

4. The dual-unit phase-sensitive track circuit receiver according to claim 1 is characterized in that: Also includes: Track input lightning protection circuit, used to protect the track from input lightning and surge; The input end of the track input lightning protection circuit is connected to the track voltage output circuit, and the output end thereof is connected to the input end of the track signal sampling circuit.

5. The dual-unit phase-sensitive track circuit receiver according to claim 1 is characterized in that: Also includes: a power supply circuit, used for providing electrical energy to the processing circuit; The power supply circuit is connected to the processing circuit.

6. The dual-unit phase-sensitive track circuit receiver according to claim 5 is characterized in that: Also includes: Anti-reverse connection circuit, used to disconnect the power circuit when the power is reversely connected; The input end of the anti-reverse connection circuit is connected to the output end of the power supply circuit, and the output end of the anti-reverse connection circuit is connected to the input end of the processing circuit.

7. The dual-unit phase-sensitive track circuit receiver according to claim 3 is characterized in that: Also includes: A / D conversion circuit, used for converting the received pulse voltage signal into a digital signal; The input end of the A / D conversion circuit is connected to the input end of the signal amplification circuit, and the output end of the A / D conversion circuit is connected to the input end of the processing circuit.

8. The dual-unit phase-sensitive track circuit receiver according to claim 1 is characterized in that: The display circuit comprises: Digital display for showing rail voltage amplitude and phase angle.

9. The dual-unit phase-sensitive track circuit receiver according to claim 1, characterized in that: The processing circuit adopts a single chip microcomputer.

10. The dual-unit phase-sensitive track circuit receiver according to claim 9, characterized in that: The single chip microcomputer adopts DSP chip.

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