CN1381372A

CN1381372A - Microcomputer monitor system for switch

Info

Publication number: CN1381372A
Application number: CN 01112674
Authority: CN
Inventors: 王辉; 陈瑾
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-04-19
Filing date: 2001-04-19
Publication date: 2002-11-27

Abstract

A microcomputer monitor system for switch features that the communication modules arranged set up between the switch sub-units are sequentially connected to controller MCU unit and interface unit for collecting switch and analog inputs, and the communication modules arranged between the statino host and several switches are connected to MCU unit, which is respectively connected with CAN interface, printer interface, LCD and clock unit.

Description

Microcomputer monitor system for switch

The present invention relates to the railway signal technology field, the track switch that belongs to railway is specifically monitored by microcomputer; Make a kind of monitoring system of railway normal transport.

The railway signals equipment normal operation is a condition precedent of guaranteeing that railway transportation normally carries out, and track switch is one of most important signalling set.Because track switch extensively is exposed in the outdoor field, station and reaches several kilometers, have non-transformer, lack transmission path (cable), quantity reach the hundreds of group, be subject to characteristics such as thunderbolt, at present to the real difficult point that belongs to of uninterrupted in real time monitoring of track switch.

Railway interests's tackling key problem " TJWX-2K signalling set microcomputer detecting system " at present though monitored numerous switching values and analog quantitys such as the power supply panel of indoor control desk indication lamp, Machine Room and relay contact, is still lastly found suitable Switch monitor scheme.Therefore, the equipment or the system that carry out complete monitoring at the track switch parameter are also unresolved, has only the system that the switch indication breach is exceeded standard and monitors, and to tongue with the monitoring of the real-time conversion power of the closely connected inspection of the 4mm of stock rail, electric liquid type switch machine, whether with expression consistent, still blank if directly checking the tongue actual position.

And for example electricity be engaged in " the XZB-1 type switch indication breach criticality alarm system " of section and Zhongzhou Univ. cooperation research and development in Zhengzhou makes present unique part open the system of pilot.There is following limitation in this system: whether monitoring target only exceeds standard for the switch indication breach, and Switch monitor is also imperfect; The final purpose of monitoring track switch is to wonder whether tongue and stock rail closely connected, though the switch indication breach whether exceed standard can the indirect reaction tongue and stock rail whether closely connected, condition is insufficient; 20 groups of track switches can only be monitored in every road, and when track switch number during greater than 20 groups, required cable conductor increases to 4,6,8,10 ..., for overwhelming majority station, not many so standby heart yearns are unless cable laying could be installed again; There is flase alarm, can not distinguishes real warning and train and exercise the caused warning of vibration.

The purpose of this invention is to provide a kind of is procotol by consumer electronics bus, adopt the low-voltage power line spread spectrum carrier communication, all track switches only need take two spare wires in standing, provide a kind of self have anti-thunderbolt, networking flexibility and node of network promptly one group of track switch be the many microcomputer monitor system for switch of a number of network node.

For finishing the technical scheme that above-mentioned purpose is taked: standing to reach between some track switch extension sets between machine and the some track switch extension sets is provided with communication module, wherein the communication module that is provided with between each track switch extension set successively connects microcontroller MCU unit, interface unit, gathers the input of switching value input and analog quantity; And the communication module that is provided with between station machine and the some track switch extension sets connects the MCU unit, and the MCU unit connects respectively that CAN interface and printing interface, LCD show, clock unit, and it is whole forms a monitoring system.The top communication module of narrating is by discharge bulb G ₁, resistance R ₁₈, R ₁₉Form lightning protection unit 1 with pizo-resistance MOV, connect high frequency magnetic core isolation coupling voltage transformer T ₂ Isolation coupling unit 1 and the lightning protection transformer T that forms of R type every coupling unit 2 ₃, and by transition inhibition diode D ₃, D ₅, D ₆With the desolate based diode D that holds ₇～D ₁₀Form lightning protection unit 2, lightning protection unit 3 is by two-way pipe D ₂Form integrated package U ₃7805, integrated package U ₄7809 form track switch Exgt Bat extension battery, integrated package U ₁SSC P300, integrated package U ₂SSC P111 forms carrier wave spectrum-spreading unit, U ₁Finish the conversion of SPI interface digital signal and extension frequency carrier signal, send signal through R ₆, C ₁₁Carry out filtering, aerotron Q ₁, R ₇～R ₉Slow amplification, C ₁₂, C ₁₃, inductance L ₅And R ₁₀Three utmost point LPFs, after U ₂Be placed on and be coupled to bus L ₃L ₄And C ₂₁Form bandpass filter, decay is lower than 100KHz and is higher than the numerous carrier signal of input spread spectrum of 400KHz, passes through resistance R again ₁₃～R ₁₆, D ₁₁With aerotron Q ₂Form transistor and amplify, arrive U ₁Carry out despreading, form by SPI interface output digital signal.

The formation design of the whole network of the present invention is the key that solves Switch monitor, and communication module (being similar to network interface card) is the core that whole network constitutes.Finish communication with the two-wire system bus form, the solution scene lacks cable conductor contradiction, the track switch extension set absorbs electric energy from bus, solve on-the-spot non-transformer problem, bus and track switch extension set internal circuit are isolated fully, the reliability of raising system, take multistage lightning protection measures, it is strong to strengthen self anti-thunderbolt ability, can reach more than the 6KV, improves the reliability of system, reach several kilometers long field extreme environment to adapt to, consumer electronics bus is a network communication protocol, is convenient to system extension and maintenance, adopts low-voltage power line spread spectrum carrier communication mode, advanced by force the antijamming capability of communication, improved the reliability of system, SPI serial interface mode and outside swap data are convenient to link to each other with different microprocessing unit MCU.

The embodiment of the invention is described in detail in conjunction with the accompanying drawings.

Fig. 1 system construction drawing of the present invention;

Fig. 2 communication module structured flowchart;

Fig. 3 communication module circuit diagram;

Fig. 4 track switch extension set constructional drawing;

Fig. 5 station machine constructional drawing.

All track switches of standing are connected by two cables, constitute network.Powered to all track switch extension sets by these two cables by the station machine, these two cables also are data transmission channels simultaneously.Stand between machine and the track switch extension set, between track switch extension set and the track switch extension set, it is such to be similar to ethernet, allowing to adopt based on csma/impact detection is that the versabus of contention judgement agreement is realized point-to-point communication.From system architecture Fig. 1, find out, design departures machine and track switch extension set general-duty communication module, and this module can provide the power supply of track switch extension set operation, can resist thunderbolt again, that just adapts to abominable site environment in the station, is convenient to connected network communication.

And for example shown in Figure 2, in communication module, at first surge and the switching power supply noise through 1 pair of strong electrostatic effect of lightning protection unit, source of AC absorbs pretreatment; Isolation coupling unit 1 and isolation are closed unit 2 bus and track switch extension set internal circuit are isolated fully; Lightning protection unit 2 and lightning protection unit 3 circuit after with the isolation coupling unit further absorbs handles electrostatic discharge effect, the surge of source of AC and the noise of Switching Power Supply, reaches inner circuit protection requirement.Isolation coupling unit 1 sends signal 100～300KHz with carrier wave and delivers on the bus, and from bus coupling carrier wave received signal, filtering is from power frequency 50Hz signal on the bus simultaneously.The reception carrier signal arrives the extension frequency carrier unit, and despreading is finished to the reception carrier signal in the extension frequency carrier unit, conforms to as the address, then receives data by SPI interface notice microcontroller MCU; For the digital signal from MCU, the extension frequency carrier modulation is finished in the extension frequency carrier unit, and sends on the bus by csma/impact detection.Isolation coupling unit 2 filterings extension frequency carrier signal on bus, coupling power frequency (50Hz) signal is handled through anti-radar unit 3, generates the needed power supply of track switch extension set by power unit.

Specify the realization of communication module constructional drawing 2 by electrical schematic diagram 3.The discharge bulb G of bus entrance ₁, resistance R ₁₈, R ₁₉Form lightning protection unit 1 jointly with pizo-resistance MOV.The isolation coupling voltage transformer T that makes by high frequency magnetic core ₂Be isolation coupling unit 1.The isolation coupling lightning protection transformer T that makes by low frequency R type magnetic core ₃Be isolation coupling unit 2.Transition suppresses diode D ₃, G ₅, D ₆With Schottky diode D ₇, D ₈, D ₉, D ₁₀Form lightning protection unit 2.Lightning protection unit 3 is by two-way TVS pipe D ₂Form.Three terminal integrated voltage stabilizer integrated package U ₃7805, U ₄7809 have formed the required power supply of track switch extension set.Integrated package U ₁SSC P300, U ₂The SSCP111 chip constitutes the carrier wave spectrum-spreading unit.U ₁Finish the conversion of the extension frequency carrier signal of the digital signal of SPI interface and 100～300KHz, send signal through R ₆, C ₁₁Carry out filtering, Q ₁, R ₇, R ₈And R ₉Buffer memory amplifies, C ₁₂, C ₁₃, L ₅And R ₁₀3 utmost point LPFs, after U ₂Amplify and be coupled to bus; L ₃, L ₄, C ₂₀And C ₂₁Form bandpass filter, decay is lower than 100KHz and is higher than the input extension frequency carrier signal of 400KHz, passes through resistance R again ₁₃～R ₁₆, D ₁₁With aerotron Q ₂Form transistor and amplify, arrive U ₁Carry out despreading, by SPI interface output digital signal.

In the track switch extension set, switching value and analog quantity are gathered, are handled by the MCU unit through behind the interface unit as shown in Figure 4, send in the network through communication module, and the MCU unit can also receive to arrive and order to network by communication module simultaneously, carries out respective handling.In station machine constructional drawing 5, communicate by letter with the track switch extension set in the whole network by communication module in the MCU unit, gathers switching value and analog data in the track switch extension set; The CAN interface is responsible for and " TJWX-2K signal microcomputer monitoring system " swap data; Clock unit provides date and time to report to the police generation constantly with record; Printing interface and LCD unit are responsible for printing and the display alarm data.

Claims

1, microcomputer monitor system for switch, it is characterized in that reaching between some track switch extension sets between station machine and the some track switch extension sets communication module is set, wherein the communication module that is provided with between each track switch extension set successively connects microcontroller MCU unit, interface unit, gathers switching value input and analog quantity input; And the communication module that is provided with between station machine and the some track switches connects the MCU unit, and the MCU unit connects respectively that CAN interface and printing interface, LCD show, clock unit, and it is whole forms a monitoring system.

2, microcomputer monitor system for switch according to claim 1 is characterized in that communication module is by discharge bulb G ₁, resistance R ₁₈, R ₁₉Form lightning protection unit 1 with pizo-resistance MOV, connect high frequency magnetic core isolation coupling voltage transformer T ₂Isolation coupling unit 1 and the lightning protection transformer T of the isolation coupling unit 2 formed of R type ₃, and by transition inhibition diode D ₃, D ₅, D ₆With Schottky diode D ₇～D ₁₀Form lightning protection unit 2, lightning protection unit 3 is by two-way pipe D ₂Form integrated package U ₃7805, integrated package U ₄7809 form track switch Exgt Bat extension battery, integrated package U ₁SSC P300, integrated package U ₂SSC P111 forms carrier wave spectrum-spreading unit, U ₁Finish the conversion of SPI interface digital signal and extension frequency carrier signal, send signal through R ₆, C ₁₁Carry out filtering, aerotron Q ₁, R ₇～R ₉Slow amplification, C ₁₂, C ₁₃, inductance L ₅And R ₁₀Two utmost point LPFs, after U ₂Be placed on and be coupled to bus L ₃L ₄And C ₂₁Form bandpass filter, decay is lower than 100KHz and is higher than the numerous carrier signal of input spread spectrum of 400KHz, passes through resistance R again ₁₃～R ₁₆, D ₁₁With aerotron Q ₂Form transistor and amplify, arrive U ₁Carry out despreading, form by SPI interface output digital signal.