CN110077439A - A kind of track circuit receiver and frequency shift modulated track circuit receiver - Google Patents
A kind of track circuit receiver and frequency shift modulated track circuit receiver Download PDFInfo
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- CN110077439A CN110077439A CN201910262621.XA CN201910262621A CN110077439A CN 110077439 A CN110077439 A CN 110077439A CN 201910262621 A CN201910262621 A CN 201910262621A CN 110077439 A CN110077439 A CN 110077439A
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- signal
- processing unit
- track circuit
- isolating transformer
- frequency
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
- B61L27/00—Central railway traffic control systems; Trackside control; Communication systems specially adapted therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
- B61L27/00—Central railway traffic control systems; Trackside control; Communication systems specially adapted therefor
- B61L27/60—Testing or simulation
Abstract
This application discloses a kind of track circuit receivers and frequency shift modulated track circuit receiver, the track circuit receiver includes signal processing unit, isolating transformer, two acquisition channels, two sense channels, two acquisition channels constitute two and take two structures, and isolating transformer includes that a primary coil and two for being used to receive measured signal is respectively equipped with a centre tapped secondary coil；Each acquisition channel acquires the differential signal of the two-terminal of a secondary coil respectively and common-mode signal and exports to signal processing unit；Signal processing unit sends detection signal to transformer secondary coil centre cap by each sense channel, differential signal is compared with predeterminated frequency and/or default amplitude to detect the state of measured signal, compare common-mode signal and detection signal, it is whether working properly to detect two acquisition channels and isolating transformer.The application can carry out integrity checking to track circuit receiver, improve safety by setting centre cap and sense channel.
Description
Technical field
This application involves but be not limited to Train Operation Control Technology field more particularly to a kind of track circuit receiver and shifting
Frequency track circuit receiver.
Background technique
Currently, ZPW-2000 frequency shift modulated track circuit equipment is the weight of the general fast route of Chinese Railway, high-speed rail route train control system
Equipment is wanted, it is to transmit information using the rail of railway as conductor, realizes the section free time and occupies the circuit system checked.It connects
The core security component that device is ZPW-2000 frequency shift modulated track circuit is received, realizes section after rail signal is acquired, is demodulated
Judgement that is idle and occupying, the rail signal of acquisition includes main orbit signal and baby track signal.
Receiver is safety component, to meet safety integrity level (Safety Integrity Level, SIL) 4
Grade, use 2 take 2 pairs of set electronic structures to guarantee its safety, and it is to realize at present below that it should be independent for, which needing Acquisition Circuit also,
Two schemes:
Scheme one:
As shown in Figure 1, baby track signal and main orbit signal pass through independent filtering and signal condition and modulus respectively
(Analog to Digital, A/D) conversion, then sends to two independent central processing unit (Central Processing
Unit, CPU) it carries out processing and 2 takes 2 to compare processing.
Scheme carries out independent process and operation first is that sending the later signal of A/D conversion circuit to two CPU, for small
For track signal and main orbit signal, either signal generates when converting by isolating transformer, filtering and signal condition and A/D
Failure or mistake opposite 2 to take 2 comparison mechanisms to belong to total because can not only identify by the reliability of device itself.
Scheme two:
As shown in Fig. 2, baby track signal and main orbit signal are divided into two by isolating transformer respectively, process is independent
Then filtering and the conversion of signal condition and A/D send to two independent CPU progress 2 and take 2 to compare processing.
Scheme is second is that be divided into two groups for main orbit signal and baby track signal since isolating transformer, respectively by independent
After filtering and signal condition, the road A/D Zhuan electricity Huan, then to two CPU carry out independent process and operation, avoid scheme one for
Detection when failure or mistake that signal generates when converting by filtering and signal condition and A/D, but for isolating transformer
Fault detection it is still unresolved.
Therefore, all there is the detection of rail signal sampling channel in current ZPW-2000 frequency shift modulated track circuit receiver in design
Incomplete problem can only be identified by device own reliability.
Summary of the invention
This application provides a kind of track circuit receivers and frequency shift modulated track circuit receiver, can receive to track circuit
Device carries out integrity checking, improves safety.
This application provides a kind of track circuit receiver, including signal processing unit, isolating transformer, two acquisitions are logical
Road, two sense channels, two acquisition channels constitute two and take two structures, in which:
Isolating transformer includes that the primary coil for being used to receive measured signal and two are respectively equipped with a centre cap
Secondary coil；
Each acquisition channel is respectively used to, and acquires the differential signal and common-mode signal of the two-terminal of a secondary coil, and
It exports to signal processing unit；Signal processing unit is sent to transformer secondary coil centre cap by each sense channel and is examined
Survey signal；
Signal processing unit is used for, and the differential signal is compared with predeterminated frequency and/or default amplitude, with detection
The state of measured signal, and the common-mode signal is compared with the detection signal, to detect described two acquisition channels
It is whether working properly with isolating transformer.
In one exemplary embodiment, the voltage change ratio of one primary coil and two secondary coils is 1:1:1.
In one exemplary embodiment, the signal processing unit by the differential signal and predeterminated frequency and/or pre-
If amplitude is compared, to detect the state of measured signal, comprising:
If the frequency of the differential signal is identical as predeterminated frequency, and the amplitude of the differential signal is higher than default width
Value, then the primary side has measured signal input；If the amplitude of the differential signal is lower than default amplitude, described first
Grade coil sides do not have measured signal input.
In one exemplary embodiment, the signal processing unit by the common-mode signal and the detection signal progress
Compare, it is whether working properly to detect described two acquisition channels and isolating transformer, comprising:
If the frequency of the common-mode signal of the two-terminal of the secondary coil and the centre cap of secondary coil described in this connect
The frequency of the detection signal of receipts is identical, and the amplitude of common-mode signal is twice of the amplitude of the detection signal, then this is described secondary
The acquisition channel and isolating transformer of grade coil connection are normal.
In one exemplary embodiment, the frequency of the received detection signal of the centre cap of described two secondary coils
It is different.
In one exemplary embodiment, the sense channel includes D/A conversion unit；The acquisition channel includes mutual
The filtering of connection and signal conditioning unit and AD conversion unit, the filtering and signal conditioning unit and the isolating transformer
It is connected, the AD conversion unit is connected with the signal processing unit.
Present invention also provides a kind of frequency shift modulated track circuit receivers, connect including two any track circuits as above
Receive device, in which:
The measured signal of one track circuit receiver is main track signal；The letter to be measured of another track circuit receiver
Number be baby track signal.
In one exemplary embodiment, the signal processing unit includes two, and the main orbit signal is one corresponding
Acquisition channel, a sense channel and the corresponding acquisition channel of the baby track signal, a sense channel share one
A signal processing unit；Another corresponding acquisition channel of the main orbit signal, another sense channel and the small rail
Another corresponding acquisition channel of road signal, another sense channel share another signal processing unit.
In one exemplary embodiment, the signal processing unit includes on-site programmable gate array FPGA interconnected
And central processor CPU, the FPGA are connected with the acquisition channel and the sense channel respectively, the FPGA is also and outside
Portion's communication interface is connected, for interface processing and signal caching；The CPU is for signal processing and controls the FPGA's
Output.Compared with the relevant technologies, the track circuit receiver and frequency shift modulated track circuit receiver of the application are taken out by setting center
Head and sense channel can carry out integrity checking to track circuit receiver, improve the safety of track circuit receiver,
The uneasy full probability for reducing hardware random fault and causing, and the product of depot repair for acquisition channel failure improve
Maintenance efficiency；Meanwhile by checking isolating transformer, reduces production process, improve production efficiency.
Other features and advantage will illustrate in the following description, also, partly become from specification
It obtains it is clear that being understood and implementing the application.Other advantages of the application can be by specification, claims
And scheme described in attached drawing is achieved and obtained.
Detailed description of the invention
Attached drawing is used to provide the understanding to technical scheme, and constitutes part of specification, with the application's
Embodiment is used to explain the technical solution of the application together, does not constitute the limitation to technical scheme.
Fig. 1 is the structural schematic diagram of one of the relevant technologies frequency shift modulated track circuit receiver；
Fig. 2 is the structural schematic diagram of another frequency shift modulated track circuit receiver in the related technology；
Fig. 3 is a kind of structural schematic diagram of track circuit receiver of the embodiment of the present invention；
Fig. 4 is a kind of structural schematic diagram of isolating transformer of the embodiment of the present invention；
When Fig. 5 is single measured signal, the operation principle schematic diagram of isolating transformer；
When Fig. 6 is single detection signal, the operation principle schematic diagram of isolating transformer；
Fig. 7 is the operation principle schematic diagram of isolating transformer when working normally (measured signal+detection signal)；
Fig. 8 is a kind of structural schematic diagram of frequency shift modulated track circuit receiver of the embodiment of the present invention；
Fig. 9 is the structural schematic diagram of another frequency shift modulated track circuit receiver of the embodiment of the present invention.
Specific embodiment
This application describes multiple embodiments, but the description is exemplary, rather than restrictive, and for this
It is readily apparent that can have more in the range of embodiments described herein includes for the those of ordinary skill in field
More embodiments and implementation.Although many possible feature combinations are shown in the attached drawings, and in a specific embodiment
It is discussed, but many other combinations of disclosed feature are also possible.Unless the feelings specially limited
Other than condition, any feature or element of any embodiment can be with any other features or element knot in any other embodiment
It closes and uses, or any other feature or the element in any other embodiment can be substituted.
The application includes and contemplates the combination with feature known to persons of ordinary skill in the art and element.The application is
It can also combine with any general characteristics or element through disclosed embodiment, feature and element, be defined by the claims with being formed
Unique scheme of the invention.Any feature or element of any embodiment can also be with features or member from other scheme of the invention
Part combination, to form the unique scheme of the invention that another is defined by the claims.It will thus be appreciated that showing in this application
Out and/or any feature of discussion can be realized individually or in any suitable combination.Therefore, in addition to according to appended right
It is required that and its other than the limitation done of equivalent replacement, embodiment is not limited.Furthermore, it is possible in the guarantor of appended claims
It carry out various modifications and changes in shield range.
In addition, method and/or process may be rendered as spy by specification when describing representative embodiment
Fixed step sequence.However, in the degree of this method or process independent of the particular order of step described herein, this method
Or process should not necessarily be limited by the step of particular order.As one of ordinary skill in the art will appreciate, other steps is suitable
Sequence is also possible.Therefore, the particular order of step described in specification is not necessarily to be construed as limitations on claims.This
Outside, the claim for this method and/or process should not necessarily be limited by the step of executing them in the order written, art technology
Personnel are it can be readily appreciated that these can sequentially change, and still remain in the spirit and scope of the embodiment of the present application.
One track circuit receiver of embodiment
As shown in figure 3, a kind of track circuit receiver according to an embodiment of the present invention, including isolating transformer and with every
Two acquisition channels, two sense channels being connected from transformer, described two acquisition channels constitute two and take two structures；Also wrap
Signal processing unit is included, the signal processing unit is connected with the acquisition channel and sense channel respectively, in which:
The isolating transformer includes a primary coil and two secondary coils, and primary coil is for receiving letter to be measured
Number, each secondary coil is respectively equipped with a centre cap；
Each acquisition channel is respectively used to, and the differential signal and common mode for acquiring the two-terminal of a secondary coil are believed
Number, and export to signal processing unit；Signal processing unit passes through each sense channel to transformer secondary coil centre cap
Send detection signal；
The signal processing unit is used for, and the differential signal is compared with predeterminated frequency and/or amplitude, with detection
The state of measured signal, and the common-mode signal is compared with the detection signal, to detect described two acquisition channels
And whether isolating transformer is working properly.
It should be noted that the signal processing unit of the application is by by the differential signal and predeterminated frequency and/or width
Value is compared, and both can also be preset a time interval with the state of real-time detection measured signal, and was periodically detected letter to be measured
Number state.
In a kind of exemplary embodiment, the voltage change ratio of one primary coil and two secondary coils is 1:1:1.
As shown in figure 4, N (1-2) be source sideline circle, for measured signal input, secondary coil be N (3-5) and N (6-8),
It is respectively used to take the two-way acquisition channel in 2 structures to input for 2.
Since the basic function of the isolating transformer of the application is buffer action, the no-load voltage ratio design of isolating transformer are as follows:
N (1-2): N (3-5): N (6-8)=1:1:1；
In order to realize self-checking function, increases centre cap in the secondary coil of isolating transformer, realizes that no-load voltage ratio is as follows:
N (3-4)=N (4-5)；
N (6-7)=N (7-8).
In a kind of exemplary embodiment, the signal processing unit by the differential signal and predeterminated frequency and/or
Default amplitude is compared, to detect the state of measured signal, comprising:
If the frequency of the differential signal is identical as predeterminated frequency, and the amplitude of the differential signal is higher than default width
Value, then the primary side has measured signal input；If the amplitude of the differential signal is lower than default amplitude, described first
Grade coil sides do not have measured signal input.
In a kind of exemplary embodiment, the signal processing unit by the common-mode signal and the detection signal into
Whether row compares, working properly to detect described two acquisition channels and isolating transformer, comprising:
If the frequency of the common-mode signal of the two-terminal of the secondary coil and the centre cap of secondary coil described in this connect
The frequency of the detection signal of receipts is identical, and the amplitude of common-mode signal is twice of the amplitude of the detection signal, then this is described secondary
The acquisition channel and isolating transformer of grade coil connection are normal.
As shown in figure 5, measured signal is divided into two-way by isolating transformer when only measured signal, no detection signal
The signal of same magnitude and frequency send to signal processing unit (CPU1, CPU2) and carries out operation.
As shown in fig. 6, when there is no measured signal, only detection signal, time of the signal processing unit to isolating transformer
The centre cap (terminal 4 or 7) of grade coil sends detection signal, terminal 3 and 5 or end from the secondary coil of isolating transformer
Son 6 and 8 carries out voltage readback detection.
In order to guarantee the complete independence of two Air conduct measurements, the frequency of the detection signal for detecting two acquisition channels
Difference is set as f2 and f2 '.
As shown in fig. 7, when working normally (existing measured signal has detection signal) again, measured signal f1 is from isolation transformation
Device source side (primary side) is inputted, and synchronous signal processing unit (CPU1, CPU2) is respectively to corresponding isolating transformer
The centre cap input detection signal of grade terminal, the terminal 3 and 5 (CPU1) of CPU1, CPU2 from the secondary coil of isolating transformer
Or (CPU2) collection voltages of terminal 6 and 8 carry out measured signal and detection signal processing.
Measured signal is poor from isolating transformer source side applied signal voltage:
V (1-2)=U1-U2；
If the detection signal potential to ground of CPU1, CPU2 output is M, it may be assumed that
U4=M；
U7=M；
It is U3, U5 that CPU1, which reads isolating transformer secondary coil (terminal 3,5) superimposed potential to ground,；CPU2 read every
It is U6, U8 from transformer secondary coil (terminal 6,8) superimposed potential to ground；
The measured signal of CPU1 acquisition is differential signal, and voltage is U3-U5=V (1-2)；
The detection signal of CPU1 back production is common-mode signal, voltage U3+U5=2M；
Similarly,
The measured signal of CPU2 acquisition is differential signal, and voltage is U6-U8=V (1-2)；
The detection signal of CPU2 back production is common-mode signal, voltage U3+U5=2M.
The signal processing unit is to the differential signal (voltage difference or terminal between the terminal 3,5 of isolating transformer 2
6, voltage difference between 8) analysis of frequency and amplitude is carried out, if correct (such as the frequency and setpoint frequency of differential signal of frequency
It is identical) and amplitude be higher than predetermined threshold value, be determined as there is measured signal input；If amplitude is lower than predetermined threshold value, determine
For the input of no measured signal.
The signal processing unit to the common-mode signal (between terminal 3,5 voltage and, alternatively, voltage between terminal 6,8
With) analysis of frequency and amplitude is carried out, if frequency correct (such as the frequency of common-mode signal and the received inspection of centre cap 4 or 7
The frequency for surveying signal is identical) and amplitude when being detection 2 times of signal of its output, it is being determined as acquisition channel and isolating transformer just
Often；If frequency or amplitude are abnormal, it is determined as that acquisition channel and/or isolating transformer are abnormal.
In a kind of exemplary embodiment, in order to guarantee the complete independence of two Air conduct measurements, adopted for detecting two
The frequency for collecting the detection signal in channel is different, is set as f2 and f2 ', the received detection of the centre cap of described two secondary coils
The frequency of signal is different.
In a kind of exemplary embodiment, the sense channel includes D/A conversion unit；The acquisition channel includes phase
The filtering and signal conditioning unit that connect and AD conversion unit, the filtering and signal conditioning unit and the isolation transformation
Device is connected, and the AD conversion unit is connected with the signal processing unit.
Two frequency shift modulated track circuit receiver one of embodiment
As shown in figure 8, a kind of frequency shift modulated track circuit receiver according to an embodiment of the present invention, including two such as any of the above
The track circuit receiver, in which:
The measured signal of one track circuit receiver is main track signal；The letter to be measured of another track circuit receiver
Number be baby track signal.
Track circuit is divided into main orbit circuit and baby track circuit two parts by ZPW-2000A type non-insulated track circuit,
Transmitter is simultaneously to route two sides main orbit circuit and baby track circuit sending signal, and main orbit receiver is except reception this section master
Outside Track Circuit Frequency-shift Signal, also while adjacent sections baby track circuit frequency-shift signaling is received, handled and result is formed into small rail
Road relay executes condition and is sent to adjacent sections.The main orbit receiver of this section is to operation front adjacent track circuit receiver
The baby track relay sent is executed after condition is checked and is formed, and acts the track relay of this section.In a kind of example
Property embodiment in, as shown in figure 8, the signal processing unit include two (signal processing unit 1 and signal processing unit 2),
The corresponding acquisition channel of the main orbit signal, a sense channel and the corresponding acquisition of the baby track signal
Channel, a sense channel share a signal processing unit (signal processing unit 1)；The main orbit signal is corresponding another
A acquisition channel, another sense channel and another corresponding acquisition channel of the baby track signal, another detection are logical
Road shares another signal processing unit (signal processing unit 2).
In the frequency shift modulated track circuit receiver of the application, main orbit signal and baby track signal can be identical using two
Isolating transformer, although main orbit signal and baby track signal are the track signal that carrier frequency is different, amplitude is different, it is realized
Principle is identical.
Below by taking main orbit signal as an example, working principle is explained as follows:
(a) working principle of single main orbit signal is as shown in figure 5, be divided into two-way for source main orbit signal by isolating transformer
The signal of same magnitude and frequency send to signal processing unit 1, signal processing unit 2 and carries out operation.
(b) working principle of single detection signal is as shown in fig. 6, the centre cap for passing through the secondary coil to isolating transformer
(terminal 4 or 7) is sent, and carries out voltage readback detection from the terminal 3 and 5 or terminal 6 and 8 of the secondary coil of isolating transformer.
(c) normal operation is as shown in fig. 7, main orbit signal f1 is carried out from isolating transformer source side (primary side)
Input, synchronous signal processing unit 1, signal processing unit 2 are inputted from the center of corresponding isolating transformer secondary terminal respectively, letter
Number processing unit 1, signal processing unit 2 from the terminal 3 and 5 (signal processing unit 1) of the secondary coil of isolating transformer or
(signal processing unit 2) collection voltages of terminal 6 and 8 carry out main orbit signal and processing.
Main orbit signal isolation transformer source side applied signal voltage is poor:
V (1-2)=U1-U2；
If the detection signal potential to ground of signal processing unit 1, signal processing unit 2 input is M, it may be assumed that
U4=M；
U7=M；
It is U3, U5 that signal processing unit 1, which reads secondary (terminal 3,5) the superimposed potential to ground of isolating transformer,；Signal
It is U6, U8 that processing unit 2, which reads secondary (terminal 6,8) the superimposed potential to ground of isolating transformer,；
It is U3-U5=V (1-2) that the main orbit signal that signal processing unit 1 acquires, which is differential signal voltage,；
The detection signal of 1 back production of signal processing unit is common-mode signal U3+U5=2M；
Similarly,
It is U6-U8=V (1-2) that the main orbit signal that signal processing unit 2 acquires, which is differential signal voltage,；
The detection signal of 2 back production of signal processing unit is common-mode signal U3+U5=2M；
Baby track signal acquisition is the same as main orbit signal principle.
The frequency shift modulated track circuit receiver of the application is output to secondary coil centre cap by will test signal, then sharp
Whether just with baby track signal, main orbit signal sampling channel back production detection aspect test acquisition channel and isolating transformer
Often, while again the difference acquisition of baby track signal, main orbit signal is not influenced.
Rail signal detection scheme
The entire scheme of the application takes 2 structures using 2, and 2 take each structure in 2 structures respectively logical using independent acquisition
Road acquires main orbit signal, baby track signal respectively.The baby track signal of signal processing unit 1, main orbit signal respectively from
First winding (terminal 3,5) of isolating transformer 1, isolating transformer 2, baby track signal, the main orbit of signal processing unit 2
Then signal is carried out the following processing respectively from isolating transformer 1, second winding (terminal 6,8) of isolating transformer 2:
1) signal processing and Air conduct measurement
Difference (voltage difference between voltage difference or terminal 6,8 between the terminal 3,5 of isolating transformer 2) solution is carried out to data
Analysis is adjusted, the analysis of frequency and amplitude is carried out, if frequency is correct (for example the frequency of differential signal is identical as the frequency of setting)
And amplitude is higher than predetermined threshold value, is determined as main orbit idle (i.e. without Che Zhanyong)；If amplitude is lower than predetermined threshold value,
Then it is determined as that main orbit state occupies.
To data carry out common mode summation (between terminal 3,5 voltage and, alternatively, between terminal 6,8 voltage and) demodulation, analysis
The frequency and amplitude that detection signal is sent from signal processing unit to isolating transformer tap (terminal 4 or 7), if frequency is correct
(for example the frequency of common-mode signal is identical as the received detection frequency of signal of centre cap 4 or 7) and amplitude are signal processing list
When 2 times for detecting signal amplitude of member output, it is determined as that acquisition channel and isolating transformer are normal；If frequency or amplitude are different
Often, then it is determined as that acquisition channel and/or isolating transformer are abnormal, closed safe and door.
2) output of signal is detected
In order to guarantee the complete independence of two Air conduct measurements, the frequency of the detection signal for detecting two acquisition channels
Difference is set as f2 and f2 '.
Three frequency shift modulated track circuit receiver two of embodiment
As shown in figure 9, a kind of frequency shift modulated track circuit receiver according to an embodiment of the present invention, the function of realizing is as follows:
(1) main orbit signal is demodulated, judges main orbit occupancy, idle state.
(2) baby track signal is demodulated, judges baby track occupancy, idle state.
(3) demodulation for main orbit, baby track signal and logic judgment result carry out 2 take 2 than it is more consistent when, allow defeated
Result out；When abnormal, it is oriented to secure side.
(4) according to main orbit state and baby track state, when the main orbit free time, track relay is driven, main orbit occupies
When, do not drive track relay；When the baby track free time, driving baby track executes condition and does not drive baby track when baby track occupies
Execution condition.
(5) it is externally exported using industry spot interface PROFIBUS-DP (Decentralized Periphery) bus,
Upload idle main orbit or occupied state and baby track free time or occupied state and working condition.
(6) periodically isolating transformer is checked, when failure is oriented to secure side, exports alert if.
D/A in Fig. 9 is digital-to-analogue conversion, and A/D is analog-to-digital conversion, and SRAM is static random access memory (Static
Random-Access Memory)。
The main orbit signal and baby track signal of the application is acquired by isolating transformer and is inputted, and the isolating transformer has
Three functions: first is that rail signal is isolated with receiver Acquisition Circuit；2 the two of 2 structures are taken second is that realizing in receiver
The electrical isolation features of road Acquisition Circuit；Third is that the function of acquisition channel self-test can be realized.
As shown in figure 9, the signal processing unit includes field programmable gate array (Field interconnected
Programmable Gate Array, FPGA) and central processing unit (Central Processing Unit, CPU), it is described
FPGA is connected with the acquisition channel and the sense channel respectively, and the FPGA is also connected with external communication interface, uses
In interface processing and signal caching；The CPU is used for signal processing and controls the output of the FPGA.
As shown in figure 4, N (1-2) is source sideline circle, inputted for main orbit signal and baby track signal, secondary coil N
(3-5) and N (6-8) is respectively used to take the two-way circuit in 2 structures to acquire input for 2.
Since the basic function of isolating transformer is buffer action, the no-load voltage ratio design of isolating transformer are as follows:
N (1-2): N (3-5): N (6-8)=1:1:1；
In order to realize self-checking function, isolating transformer secondary coil is increased into centre cap, realizes that no-load voltage ratio is as follows:
N (3-4)=N (4-5)；
N (6-7)=N (7-8).
In the frequency shift modulated track circuit receiver of the application, main orbit signal and baby track signal can be identical using two
Isolating transformer, although main orbit signal and baby track signal are the track signal that carrier frequency is different, amplitude is different, it is realized
Principle is identical.
Below by taking main orbit signal as an example, working principle is explained as follows:
(a) working principle of single main orbit signal is as shown in figure 5, be divided into two-way for source main orbit signal by isolating transformer
The signal of same magnitude and frequency send to CPU1, CPU2 and carries out operation.
(b) working principle of single detection signal is as shown in fig. 6, the centre cap for passing through the secondary coil to isolating transformer
(terminal 4 or 7) sends detection signal, carries out voltage from the terminal 3 and 5 or terminal 6 and 8 of the secondary coil of isolating transformer and returns
Read detection.
(c) normal operation is as shown in fig. 7, main orbit signal f1 is carried out from isolating transformer source side (primary side)
Input, while the center of CPU1, CPU2 respectively by itself FPGA, D/A conversion from corresponding isolating transformer secondary terminal is defeated
Enter and detects signal, the terminal 3 and 5 (CPU1) or terminal 6 and 8 (CPU2) of CPU1, CPU2 from the secondary coil of isolating transformer
Collection voltages carry out main orbit signal and detection signal processing.
Main orbit signal isolation transformer source side applied signal voltage is poor:
V (1-2)=U1-U2；
If it is M that CPU1, CPU2, which detect signal potential to ground, it may be assumed that
U4=M；
U7=M；
It is U3, U5 that CPU1, which reads secondary (terminal 3,5) the superimposed potential to ground of isolating transformer,；CPU2 reads isolation and becomes
Depressor secondary (terminal 6,8) superimposed potential to ground is U6, U8；
It is U3-U5=V (1-2) that the main orbit signal of CPU1 acquisition, which is differential signal voltage,；
The detection signal of CPU1 back production is common-mode signal U3+U5=2M；
Similarly,
It is U6-U8=V (1-2) that the main orbit signal of CPU2 acquisition, which is differential signal voltage,；
The detection signal of CPU2 back production is common-mode signal U3+U5=2M；
Baby track signal acquisition is the same as main orbit signal principle.
The application is output to secondary coil centre cap by will test signal, then utilizes baby track signal, main orbit
Signal sampling channel back production detects aspect test acquisition channel and whether isolating transformer is normal, while not influencing small rail again
The difference acquisition of road signal, main orbit signal.
Rail signal detection scheme
The entire scheme of the application takes 2 structures using 2, and 2 take each structure in 2 structures respectively autonomous channel to be used to distinguish
Acquire main orbit signal, baby track signal.For main orbit signal, after isolating transformer, pass through filtering and signal condition
And after A/D conversion, data buffering is carried out into FPGA.CPU reads the A/D data of FPGA, baby track signal, the backbone of CPU1
Road signal respectively from isolating transformer 1, first winding (terminal 3,5) of isolating transformer 2, the baby track signal of CPU2,
Then main orbit signal carries out following place respectively from isolating transformer 1, second winding (terminal 6,8) of isolating transformer 2
Reason:
1) signal processing and Air conduct measurement
Difference (voltage difference between voltage difference or terminal 6,8 between the terminal 3,5 of isolating transformer 2) solution is carried out to data
Analysis is adjusted, the analysis of frequency and amplitude is carried out, if frequency is correct (for example the frequency of differential signal is identical as the frequency of setting)
And amplitude is higher than predetermined threshold value, is determined as main orbit idle (i.e. without Che Zhanyong)；If amplitude is lower than predetermined threshold value,
Then it is determined as that main orbit state occupies.
To data carry out common mode summation (between terminal 3,5 voltage and, alternatively, between terminal 6,8 voltage and) demodulation, analysis
The frequency and amplitude for sending detection signal to isolating transformer tap (terminal 4 or 7) in real time by D/A from CPU, if frequency is just
Really (for example the frequency of common-mode signal is identical as the received detection frequency of signal of centre cap) and amplitude are CPU defeated by D/A
At be worth out 2 times, it is determined as that acquisition channel and isolating transformer are normal；If frequency or amplitude are abnormal, it is judged to acquiring logical
Road and/or isolating transformer are abnormal, closed safe and door.
2) D/A detects the output of signal
In order to guarantee the complete independence of two Air conduct measurements, the frequency of the detection signal for detecting two acquisition channels
Difference is set as f2 and f2 '.
As shown in figure 9, the frequency shift modulated track circuit receiver of the application integrally uses 2 to take 2 structures, 2 take each of 2 structures
Structure is by independent filtering and signal condition, A/D conversion, FPGA, CPU, baby track inspection condition, carrier frequency selection and DP interface group
At using component and circuit electrical isolation between two structures, independently of each other.
The framework that signal processing unit in Fig. 9 uses FPGA, CPU to combine, FPGA realize A/D conversion, D/A conversion, DP
Bus, 2 take 2 the interface managements such as to compare, and CPU realizes demodulation logic judgment:
FPGA is mainly responsible for all interface processing and A/D conversion, D/A conversion, DP bus interface, carrier frequency select,
The information interaction of FPGA, the inspection of baby track condition, safety and door control, alarm relay control.
CPU is mainly responsible for the data of processing FPGA acquisition, and controls the output of FPGA.Each CPU to baby track signal,
After main orbit signal is demodulated, 2 are carried out for the judging result of main orbit and baby track and takes 2 to compare, allows to pacify than more consistent
Quan Yumen output, inconsistent cutting safety and door.
After CPU handles data, obtaining baby track, main orbit free time or occupied state can after 2 take 2 to compare
With externally output in two forms:
(1) idle baby track, main orbit or occupied state and itself work are exported by correspondence through DP bus interface
State；
(2) dual processors control safe AND gate circuit after 2 take 2 processing with Dynamic Signal, form baby track, main orbit driving
The condition of relay.
Compared with existing ZPW-2000 frequency shift modulated track circuit receiver, the frequency shift modulated track circuit receiver of the application has
Following advantage:
(1) the safety is improved: ZPW-2000 frequency shift modulated track circuit receiver is train occupation, the idle unique portion checked
Part realizes the end-to-end of the rail signal sampling channel such as isolating transformer, filtering and signal condition, A/D conversion, can be further
The safety of receiver is improved, reduces hardware random fault and the uneasy full probability that causes.
(2) production efficiency improves: existing scheme does not detect isolating transformer, and isolating transformer is a pass
Key device must individually examine isolating transformer before the manufacturing, to guarantee quality.The shift frequency track electricity of the application
Inherently each main orbit signal, baby track signal path include that isolating transformer etc. carries out independent inspection to road receiver
It looks into, without individually to the process of isolating transformer detection, reducing process, improving production efficiency.
(3) maintenance efficiency improves: ZPW-2000 frequency shift modulated track circuit receiver is 2 to take 2 frameworks, and existing scheme is only logical
Crossing 2 takes 2 modes compared to detect main orbit signal, baby track signal sampling channel, when failure occurs, cannot accurately determine
Position is which breaks down, and needs two-way while being checked.The application is any main orbit signal, baby track signal acquisition
Channel has all carried out independent detection, and any channel failure, which can be transferred through itself, detected, and acquisition channel failure is returned
The product of factory's maintenance, improves maintenance efficiency.
It will appreciated by the skilled person that whole or certain steps, system, dress in method disclosed hereinabove
Functional module/unit in setting may be implemented as software, firmware, hardware and its combination appropriate.In hardware embodiment,
Division between the functional module/unit referred in the above description not necessarily corresponds to the division of physical assemblies；For example, one
Physical assemblies can have multiple functions or a function or step and can be executed by several physical assemblies cooperations.Certain groups
Part or all components may be implemented as by processor, such as the software that digital signal processor or microprocessor execute, or by
It is embodied as hardware, or is implemented as integrated circuit, such as specific integrated circuit.Such software can be distributed in computer-readable
On medium, computer-readable medium may include computer storage medium (or non-transitory medium) and communication media (or temporarily
Property medium).As known to a person of ordinary skill in the art, term computer storage medium is included in for storing information (such as
Computer readable instructions, data structure, program module or other data) any method or technique in the volatibility implemented and non-
Volatibility, removable and nonremovable medium.Computer storage medium include but is not limited to RAM, ROM, EEPROM, flash memory or its
His memory technology, CD-ROM, digital versatile disc (DVD) or other optical disc storages, magnetic holder, tape, disk storage or other
Magnetic memory apparatus or any other medium that can be used for storing desired information and can be accessed by a computer.This
Outside, known to a person of ordinary skill in the art to be, communication media generally comprises computer readable instructions, data structure, program mould
Other data in the modulated data signal of block or such as carrier wave or other transmission mechanisms etc, and may include any information
Delivery media.
Claims (9)
1. a kind of track circuit receiver, which is characterized in that including signal processing unit, isolating transformer, two acquisition channels,
Two sense channels, two acquisition channels constitute two and take two structures, in which:
Isolating transformer includes the primary coil for being used to receive measured signal and two are respectively equipped with one centre tapped time
Grade coil；
Each acquisition channel is respectively used to, and acquires the differential signal and common-mode signal of the two-terminal of a secondary coil, and is exported
To signal processing unit；Signal processing unit sends detection letter to transformer secondary coil centre cap by each sense channel
Number；
Signal processing unit is used for, and the differential signal is compared with predeterminated frequency and/or default amplitude, to be measured to detect
The state of signal, and the common-mode signal is compared with the detection signal, with detect described two acquisition channels and every
It is whether working properly from transformer.
2. track circuit receiver according to claim 1, which is characterized in that the signal processing unit by the difference
Sub-signal is compared with predeterminated frequency and/or default amplitude, to detect the state of measured signal, comprising:
If the frequency of the differential signal is identical as predeterminated frequency, and the amplitude of the differential signal is higher than default amplitude, then
The primary side has measured signal input；If the amplitude of the differential signal is lower than default amplitude, the primary line
Circle side does not have measured signal input.
3. track circuit receiver according to claim 1, which is characterized in that one primary coil and two secondary
The voltage change ratio of coil is 1:1:1.
4. track circuit receiver according to claim 3, which is characterized in that the signal processing unit will be described total
Whether mould signal is compared with the detection signal, working properly to detect described two acquisition channels and isolating transformer,
Include:
If the frequency of the common-mode signal of the two-terminal of the secondary coil and the centre cap of secondary coil described in this are received
The frequency for detecting signal is identical, and the amplitude of common-mode signal is twice of the amplitude of the detection signal, then the secondary wire
Acquisition channel and the isolating transformer for enclosing connection are normal.
5. track circuit receiver according to claim 1, which is characterized in that the centre cap of described two secondary coils
The frequency of the received detection signal is different.
6. track circuit receiver according to claim 1, which is characterized in that the sense channel includes digital-to-analogue conversion list
Member；The acquisition channel includes filtering interconnected and signal conditioning unit and AD conversion unit, the filtering and signal
Conditioning unit is connected with the isolating transformer, and the AD conversion unit is connected with the signal processing unit.
7. a kind of frequency shift modulated track circuit receiver, which is characterized in that including two tracks as described in claim 1 to 6 is any
Circuit receivers, in which:
The measured signal of one track circuit receiver is main track signal；The measured signal of another track circuit receiver is
Baby track signal.
8. frequency shift modulated track circuit receiver according to claim 7, which is characterized in that the signal processing unit includes two
A, the corresponding acquisition channel of the main orbit signal, a sense channel and the baby track signal are one corresponding
Acquisition channel, a sense channel share a signal processing unit；Another corresponding acquisition channel of the main orbit signal,
Another sense channel and another corresponding acquisition channel of the baby track signal, another sense channel share another
Signal processing unit.
9. frequency shift modulated track circuit receiver according to claim 7, which is characterized in that the signal processing unit includes phase
The on-site programmable gate array FPGA and central processor CPU to connect, the FPGA respectively with the acquisition channel and described
Sense channel is connected, and the FPGA is also connected with external communication interface, for interface processing and signal caching；It is described
CPU is used for signal processing and controls the output of the FPGA.
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| CN110077439B (en) | 2021-04-30 |
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