CN103839472A - Railway sand table frequency-shift signal generator - Google Patents
Railway sand table frequency-shift signal generator Download PDFInfo
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- CN103839472A CN103839472A CN201310532852.0A CN201310532852A CN103839472A CN 103839472 A CN103839472 A CN 103839472A CN 201310532852 A CN201310532852 A CN 201310532852A CN 103839472 A CN103839472 A CN 103839472A
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Abstract
The invention provides a railway sand table frequency-shift signal generator. The railway sand table frequency-shift signal generator comprises a carrier frequency switching unit, a signal system switching unit, an 18 information switching condition, a microprocessor, a crystal oscillator, an active crystal oscillator, a DDS chip, a power amplifier and an isolation transformer. The microprocessor is connected with the carrier frequency switching unit, the signal system switching unit and the information switching condition and receives switching control information input by each unit. The output end of the microprocessor is connected with the DDS chip and transmits control signals, uplink/downlink side frequency data control words and low-frequency modulation level signals to the DDS chip. A built-in oscillating circuit of the microprocessor and the crystal oscillator are connected to form a work clock. The microprocessor generates the low-frequency modulation level signals through frequency division and sends the low-frequency modulation level signals to the DDS chip. The railway sand table frequency-shift signal generator can generate three kinds of railway dedicated frequency-shift information with continuous phases, and the generated low frequency and the generated carrier frequency are quite high in precision. The railway sand table frequency-shift signal generator is small in size, simple in circuit, easy to design, and capable of meeting the requirements of railway academy experimental training teaching.
Description
Technical field
The present invention relates to the special shift frequency fsk signal of railway modulation technique, particularly a kind of rail sand table frequency-shift signaling generator for rail sand table track circuit.
Background technology
At present, known rail sand table is not installed the special frequency-shift signaling equipment of any railway, and just simple control train operation, is not suitable for the experimental real-training teaching of railway universities and colleges.If the railway frequency-shift signal equipment of practical application, not only bulky on installing railway, circuit complexity, price is more expensive, and signaling mode is single, is not suitable for applying on the sand table of railway universities and colleges.
Summary of the invention
In order to adapt to railway universities and colleges experimental real-training teaching demand, the invention provides a kind of simple and practical rail sand table frequency-shift signaling generator, to overcome the existing above-mentioned deficiency of prior art.
The technical scheme that the present invention takes is: a kind of rail sand table frequency-shift signaling generator, and described rail sand table frequency-shift signaling generator comprises carrier frequency switch unit, signaling mode switch unit, 18 information switching conditions, microprocessor, crystal oscillator, active crystal oscillator, DDS chip, power amplifier and isolating transformer;
Described microprocessor is the control core of shift frequency transmitter, comprise central processing unit and timer, its input port respectively with described carrier frequency switch unit, signaling mode switch unit and information switching condition connect, and accept described carrier frequency switch unit, the switching control information of signaling mode switch unit and the input of information switching condition, the output port of microprocessor is connected with DDS chip and to its pipage control signal, on, lower side frequency data control word and low frequency modulations level signal, the oscillatory circuit that microprocessor is built-in and described crystal oscillator connect and compose the work clock of microprocessor, described timer produces low frequency modulations level signal by frequency division, flows to DDS chip through described central processing unit,
Described carrier frequency switch unit is used for controlling three kinds of standards of railway signal, the i.e. switching of domestic shift frequency, UM71 and ZPW2000A;
Described signaling mode switch unit is for controlling 4 kinds or 8 kinds of carrier frequency switchings of three kinds of standards of corresponding railway signal;
Described information switching condition is the encoding condition that front block section receiver is sent here;
Described active crystal oscillator is connected and is used to DDS chip that working oscillation frequency is provided with DDS chip;
Described DDS chip is the continuous railway frequency-shift signal of output phase under microprocessor control;
Described power amplifier is for carrying out power amplification to the signal of DDS chip output, to effectively transmit to sand table rail by isolating transformer;
Described isolating transformer, for the signal on rail is isolated, is sent to sand table rail shift frequency.
Its further technical scheme is: described DDS chip adopts AD9832, built-in " register 0 " and " register 1 ";
Described microprocessor adopts STC12C4052 series or STC12C5628 series, 9,7 pin that 7,8 pin of microprocessor connect respectively DDS chip send control signal to it, 8 pin that 9 pin of microprocessor connect DDS chip send respectively the upper and lower side frequency data control word of carrier frequency to " register 0 " and " register 1 " in DDS chip, carry two registers in low frequency modulations level signal alternate selection DDS chip thereby 6 pin of microprocessor connect 10 pin of DDS chip to it.
Its further technical scheme be: described crystal oscillator is made up of the first electric capacity, the second electric capacity and crystal oscillator, 4 pin, the other end ground connection of the first electric capacity one termination microprocessor, 5 pin of the second electric capacity one termination microprocessor, other end ground connection, crystal oscillator is connected in parallel between 4 pin and 5 pin of microprocessor, and the oscillation frequency of crystal oscillator is 12MHz.
3,4 pin of described active crystal oscillator connect respectively positive supply and ground, and 1 pin is unsettled, and 2 pin connect 6 pin of DDS chip, for DDS chip provides working oscillation frequency.
Described power amplifier adopts LM1875 or TDA2030 or LA4425, and the input end of power amplifier is connected with 14 pin of DDS chip, and the output terminal of power amplifier is connected with the primary side of isolating transformer.
Owing to taking technique scheme, the present invention's rail sand table frequency-shift signaling generator has following beneficial effect:
1. this generator utilizes microprocessor to control AD9832, produce the railway shift frequency fsk signal of continuous phase by outside switching condition control AD9832, can produce the special shift frequency information of domestic 18 information, UM71 and tri-kinds of railway signal standards of ZPW2000, and phase place is continuous, can meet the requirement of railway universities and colleges experimental real-training teaching;
2. due to the timer and the high-resolution DDS chip that adopt in microprocessor, the low frequency producing and carrier frequency precision are high;
3. can to realize volume little for this generator, and circuit is simple, and easily design, can be effectively applied in rail sand table, is conducive to railway universities and colleges and realizes practice-training teaching.
Accompanying drawing explanation
Fig. 1: the present invention's rail sand table shift frequency transmitter architecture block diagram;
Fig. 2: the present invention's rail sand table shift frequency transmitter circuit connection layout.
In figure:
1-carrier frequency switch unit, 2-signaling mode switch unit, 3-microprocessor, 31-central processing unit, 32-timer, 4-crystal oscillator, 5-active crystal oscillator, 6-DDS chip, 7-power amplifier, 8-isolating transformer, 9-18 information switching conditions;
C1-the first electric capacity, C2-the second electric capacity, X1-crystal oscillator.
Embodiment
A kind of rail sand table frequency-shift signaling generator, described rail sand table frequency-shift signaling generator comprises carrier frequency switch unit 1, signaling mode switch unit 2,18 information switching conditions 9, microprocessor 3, crystal oscillator 4, active crystal oscillator 5, DDS chip 6, power amplifier 7 and isolating transformer 8;
Described microprocessor 3 is the control core of shift frequency transmitter, comprise central processing unit 31 and timer 32, its input port respectively with described carrier frequency switch unit, signaling mode switch unit and 18 information switching conditions connect, and accept described carrier frequency switch unit, the switching control information of signaling mode switch unit and the input of 18 information switching conditions, the output port of microprocessor is connected with DDS chip and to its pipage control signal and upper, lower side frequency data control word and low frequency modulations level signal, the oscillatory circuit that microprocessor is built-in and described crystal oscillator connect and compose the work clock of microprocessor, described timer 32 produces low frequency modulations level signal by frequency division, flows to DDS chip through described central processing unit 31,
Described carrier frequency switch unit 1 is for controlling three kinds of standards of railway signal, the i.e. switching of domestic shift frequency, UM71 and ZPW2000A;
Described signaling mode switch unit 2 is for controlling 4 kinds or 8 kinds of carrier frequency switchings of three kinds of standards of corresponding railway signal; The encoding condition that described 18 information switching conditions 9 are sent here for front block section receiver; Described active crystal oscillator 5 is connected and is used to DDS chip that working oscillation frequency is provided with DDS chip; Described DDS chip 6 is the continuous railway frequency-shift signal of output phase under microprocessor control; Described power amplifier 7 is for carrying out power amplification to the signal of DDS chip output, to effectively transmit to sand table rail by isolating transformer; Described isolating transformer 8 is for the signal on rail is isolated, and the shift frequency that power amplifier is carried is sent to sand table rail.
Described DDS chip adopts AD9832, built-in " register 0 " and " register 1 "; Described microprocessor 3 adopts STC12C4052 series, 9,7 pin that 7,8 pin of microprocessor connect respectively DDS chip send control signal to it, 8 pin that 9 pin of microprocessor connect DDS chip send respectively the upper and lower side frequency data control word of carrier frequency to " register 0 " and " register 1 " in DDS chip, carry two registers in low frequency modulations level signal alternate selection DDS chip thereby 6 pin of microprocessor connect 10 pin of DDS chip to it.
Described crystal oscillator 4 is made up of the first capacitor C 1, the second capacitor C 2 and crystal oscillator X1,4 pin, the other end ground connection of the first capacitor C 1 one termination microprocessors, 5 pin of the second capacitor C 2 one termination microprocessors, other end ground connection, crystal oscillator X1 is connected in parallel between 4 pin and 5 pin of microprocessor, and the oscillation frequency of crystal oscillator X1 is 12MHz.
3,4 pin of described active crystal oscillator connect respectively positive supply and ground, and 1 pin is unsettled, and 2 pin connect 6 pin of DDS chip, for DDS chip provides working oscillation frequency.
Described power amplifier adopts LM1875 or TDA2030 or LA4425, and the input end of power amplifier is connected with 14 pin of DDS chip, and the output terminal of power amplifier is connected with the primary side of isolating transformer.
Conversion as above-described embodiment:
1. described in, microprocessor also can adopt STC12C5628 series, or has other series of identical function;
2. described in, power amplifier page can adopt TDA2030 or LA4425 or have other modules of identical function.
Claims (5)
1. a rail sand table frequency-shift signaling generator, is characterized in that: described rail sand table frequency-shift signaling generator comprises carrier frequency switch unit (1), signaling mode switch unit (2), 18 information switching conditions (9), microprocessor (3), crystal oscillator (4), active crystal oscillator (5), DDS chip (6), power amplifier (7) and isolating transformer (8);
Described microprocessor (3) is the control core of shift frequency transmitter, comprise central processing unit (31) and timer (32), its input port respectively with described carrier frequency switch unit, signaling mode switch unit and 18 information switching conditions connect, and accept described carrier frequency switch unit, the switching control information of signaling mode switch unit and the input of 18 information switching conditions, the output port of microprocessor is connected with DDS chip and to its pipage control signal, on, lower side frequency data control word and low frequency modulations level signal, the oscillatory circuit that microprocessor is built-in and described crystal oscillator connect and compose the work clock of microprocessor, described timer (32) produces low frequency modulations level signal by frequency division, flows to DDS chip through described central processing unit (31),
Described carrier frequency switch unit is for controlling three kinds of standards of railway signal, the i.e. switching of domestic shift frequency, UM71, ZPW2000A;
Described signaling mode switch unit is for controlling 4 kinds or 8 kinds of carrier frequency switchings of three kinds of standards of corresponding railway signal;
Described 18 information switching conditions are the encoding condition that front block section receiver is sent here;
Described active crystal oscillator is connected and is used to DDS chip that working oscillation frequency is provided with DDS chip;
Described DDS chip is the continuous railway frequency-shift signal of output phase under microprocessor control;
Described power amplifier is for carrying out power amplification to the signal of DDS chip output, to effectively transmit to sand table rail by isolating transformer;
Described isolating transformer, for the signal on rail is isolated, is sent to sand table rail shift frequency.
2. rail sand table frequency-shift signaling generator according to claim 1, is characterized in that:
Described DDS chip adopts AD9832, built-in " register 0 " and " register 1 ";
Described microprocessor (3) adopts STC12C4052 series or STC12C5628 series, 9,7 pin that 7,8 pin of microprocessor connect respectively DDS chip send control signal to it, 8 pin that 9 pin of microprocessor connect DDS chip are carried respectively the upper and lower side frequency data control word of carrier frequency to " register 0 " and " register 1 " in DDS chip, carry two registers in low frequency modulations level signal alternate selection DDS chip thereby 6 pin of microprocessor connect 10 pin of DDS chip to it.
3. rail sand table frequency-shift signaling generator according to claim 1 and 2, is characterized in that:
Described crystal oscillator is made up of the first electric capacity (C1), the second electric capacity (C2) and crystal oscillator (X1), 4 pin, the other end ground connection of the first electric capacity (C1) termination microprocessor, 5 pin of the second electric capacity (C2) termination microprocessor, other end ground connection, crystal oscillator (X1) is connected in parallel between 4 pin and 5 pin of microprocessor, and the oscillation frequency of crystal oscillator (X1) is 12MHz.
4. rail sand table frequency-shift signaling generator according to claim 3, is characterized in that:
3,4 pin of described active crystal oscillator connect respectively positive supply and ground, and 1 pin is unsettled, and 2 pin connect 6 pin of DDS chip, for DDS chip provides working oscillation frequency.
5. rail sand table frequency-shift signaling generator according to claim 4, is characterized in that:
Described power amplifier adopts LM1875 or TDA2030 or LA4425, and the input end of power amplifier is connected with 14 pin of DDS chip, and the output terminal of power amplifier is connected with the primary side of isolating transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201310532852.0A CN103839472A (en) | 2013-03-24 | 2013-11-01 | Railway sand table frequency-shift signal generator |
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| CN201320135094 | 2013-03-24 | ||
| CN201320135094.4 | 2013-03-24 | ||
| CN201310532852.0A CN103839472A (en) | 2013-03-24 | 2013-11-01 | Railway sand table frequency-shift signal generator |
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| CN103839472A true CN103839472A (en) | 2014-06-04 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104460581A (en) * | 2014-09-29 | 2015-03-25 | 株洲南车时代电气股份有限公司 | Track signal generating device and method |
| CN104575154B (en) * | 2015-01-20 | 2017-03-22 | 柳州铁道职业技术学院 | High-speed rail sand table train control system |
| CN108766156A (en) * | 2018-08-20 | 2018-11-06 | 华北电力大学（保定） | A kind of portable mould electricity experiment teaching system based on ZIGBEE communications |
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2013
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104460581A (en) * | 2014-09-29 | 2015-03-25 | 株洲南车时代电气股份有限公司 | Track signal generating device and method |
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| CN104575154B (en) * | 2015-01-20 | 2017-03-22 | 柳州铁道职业技术学院 | High-speed rail sand table train control system |
| CN108766156A (en) * | 2018-08-20 | 2018-11-06 | 华北电力大学（保定） | A kind of portable mould electricity experiment teaching system based on ZIGBEE communications |
| CN108766156B (en) * | 2018-08-20 | 2023-12-08 | 泰若五号(宿州)智能制造有限公司 | ZIGBEE communication-based portable analog electric experiment teaching system |
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Application publication date: 20140604 |