CN102060039B - Direct-current pulse driving and detecting device for foreign body sensor - Google Patents
Direct-current pulse driving and detecting device for foreign body sensor Download PDFInfo
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- CN102060039B CN102060039B CN 201010534159 CN201010534159A CN102060039B CN 102060039 B CN102060039 B CN 102060039B CN 201010534159 CN201010534159 CN 201010534159 CN 201010534159 A CN201010534159 A CN 201010534159A CN 102060039 B CN102060039 B CN 102060039B
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Abstract
The invention provides a direct-current pulse driving and detecting device for a foreign body sensor. By adopting direct-current pulse signals and monitoring voltage and frequency of input and output signals, the device ensures that the signals can not cause abnormal work of a power grid due to the introduction of other signals as a result of crosstalk and the like; and when a multilayer power grid mode is adopted in an interception network, the pulse signals of different frequencies are adopted, and signal crosstalk is prevented by monitoring the signal frequencies of different points. The device can well solve the problem of mutual interference field due to the adoption of two alternating-current signals in the interception network by adopting the direct-current pulse technology, and meanwhile, the security and reliability of a system are improved because of the adoption of the dynamic pulse signals.
Description
Technical field
The foreign body intrusion that the invention belongs to Railway Environment monitoring field of preventing and reducing natural disasters is mainly used in the public foreign body intrusion situation of striding metal bridge beam, tunnel and being prone to take place the location of geologic hazard of monitoring.
Background technology
Develop with high-speed rail technology; Railway anti-disaster is as a big engineering project; Become big engineering of the newly-built high-speed railway of each bar and technical matters; Have influence on the traffic safety of bullet train, be in particular in weather conditions, geologic agent and human factor, these factors can cause great traffic safety accident.The foreign body intrusion that is particularly caused by geologic agent and human factor falls etc. like foreign matter on abrupt slope falling rocks, the bridge and can directly cause derail even bigger safe driving accident.Therefore the foreign body intrusion sensor is in the railway anti-disaster system one the very ingredient of core.
Current domestic foreign matter interception net has developed into the third generation, and employing compound substance and detection cable adopt close winding mold formula, and the detection cable becomes as a whole with the mode that interception net compound substance is cast through low temperature.In order to improve the interception accuracy of interception net; Adopt cable close around pattern; Causing the coupling situation between two nets serious under the situation of the two net work of interception net, very big to the AC detection circuit influence, adopt the conventional dynamic testing circuit to detect.
Summary of the invention
For solving the problem that exists in the current foreign matter electrical network detection of dynamic, the invention provides a kind of foreign matter sensor DC pulse and drive and pick-up unit.
Foreign matter sensor DC pulse drives and pick-up unit; It is characterized in that said device comprises that square-wave signal takes place and adjustment circuit, power amplification circuit, transformer coupled and amplifying circuit, full-wave rectifying circuit, signal characteristic testing circuit, low-pass filter circuit, on-the-spot junk relay, frequency detecting transformer, lightning protection circuit and third generation interception net;
Said square-wave signal takes place to link to each other with the input end of power amplification circuit and signal characteristic testing circuit respectively with the output terminal of adjustment circuit;
The output terminal of said power amplification circuit links to each other with the input end of amplifying circuit with transformer coupled;
The output terminal of an auxiliary winding of transformer links to each other through the input end of lightning protection circuit and third generation interception net in said transformer coupled and the amplifying circuit, and the output terminal of another auxiliary winding links to each other with the input end of signal characteristic testing circuit;
The main winding of said frequency detecting transformer links to each other through the output terminal of lightning protection circuit with third generation interception net; The output terminal of an auxiliary winding links to each other with input end with the signal characteristic testing circuit, and the output terminal of its another auxiliary winding links to each other with on-the-spot junk relay through low-pass filter circuit;
Said low-pass filter circuit is sent to the signal characteristic testing circuit with the drive signal that it provides for on-the-spot junk relay.
Said full-wave rectifying circuit transfers AC signal to dc pulse signal and output.
When said interception net adopts the multilayer grid mode, adopt the pulse signal of different frequency, prevent that through the signal frequency of monitoring difference signal from sealing in.
Said signal characteristic testing circuit and control center adopt data communication interface to realize data interchange.
The present invention adopts the DC pulse technology can solve well owing to on-the-spot problem appears disturbing mutually in two kinds of AC signals of interception net employing, because signal adopts dynamic pulse signal, has improved the security and the reliability of system simultaneously.
Description of drawings
Below in conjunction with accompanying drawing the present invention is elaborated:
Fig. 1 is that foreign matter sensor DC pulse drives and the pick-up unit block diagram;
Fig. 2 is the connection mode synoptic diagram of frequency detecting transformer.
Embodiment
As shown in Figure 1, the square-wave signal generation is that system improves working signal with the adjustment circuit, adjusts the size of output circuit through the pulse strength of adjustment working signal.Power amplification circuit carries out power amplification to square-wave signal, with driving transformer coupling and amplifying circuit.To frequency detecting transformer main winding, an auxiliary winding of this transformer provides the frequency detecting signal for the signal characteristic testing circuit to signal through full-wave rectifying circuit, lightning protection circuit, third generation interception net.
Signal takes place all will measure with the detection frequency and to right, prevent the misoperation that other AC signal and interface circuit job failure cause.When the interception net adopts the multilayer grid mode, adopt the pulse signal of different frequency, prevent that through the signal frequency of monitoring difference signal from sealing in.
Foreign body intrusion sensor square-wave signal takes place with adjustment circuit, power amplification circuit, transformer coupledly partly all adopts pure Realization of Analog Circuit with Key Circuit such as amplifying circuit, full-wave rectifying circuits; To guarantee the reliability of circuit; Voltage, frequency monitoring circuit adopt digital circuit to realize simultaneously; And get in touch through digital communication and control center, realize warning function and fault location function.
Signal takes place with adjustment circuit and power amplification circuit element following:
Adopt the most basically, the most ripe lc circuit is as signal generating circuit, produces approximate square-wave signal, isolate and the voltage adjustment through electric capacity; Adopt audio-frequency power amplifier spare that signal is amplified then; Amplifying circuit adopts LM1875 as power amplifying device, adopts direct current to follow simultaneously, exchanges the pattern of amplifying; Signal is amplified, produce 50% dutycycle square-wave signal.Power amplification circuit output maximum voltage is the 20V peak-to-peak voltage.
Transformer coupled and amplifying circuit is coupled signal and isolates, and signal is amplified, and offers full-wave rectifying circuit.Simultaneously because the AC signal that another secondary of transformer produces is handled the measuring-signal frequency by the signal characteristic testing circuit.
Full-wave rectifying circuit transfers AC signal to dc pulse signal and output, and interchange characteristic that like this can stick signal provides the signal frequency characteristic for return signal detects.
The connection mode of frequency detecting transformer is as shown in Figure 2; As input, an end is as output, like this for the dc pulse signal by the input of INPUT end with main winding one end of T2; Can not influence its DC component; And with pulse ac component output, thereby for frequency detection circuit provides detection signal, this frequency signal and signal are two times of signal frequency of adjusting circuit.
Signal is through behind the frequency detecting transformer, and AC compounent can produce very high attenuation, but in order further to reduce AC compounent, adopts electric capacity as passive low ventilating filter spare, for on-the-spot junk relay and signal characteristic testing circuit provide signal.
The signal characteristic observation circuit needs monitored signal to comprise: square-wave signal take place with the output frequency of adjustment circuit, transformer coupled and amplifying circuit in AC signal, the output frequency of frequency detecting transformer auxiliary winding, the junk relay driving voltage of another secondary generation of transformer; Simultaneously at panel shows signal occurrence frequency, frequency reception signal and relay driving voltage, so that the field staff debugs.This circuit need be realized data interchange with control center simultaneously, adopts data communication interface, like realizations such as CAN or 485.
The above is merely the preferred embodiments of the present invention, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.All within spirit of the present invention and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (2)
1. foreign matter sensor DC pulse drives and pick-up unit; It is characterized in that said device comprises that square-wave signal takes place and adjustment circuit, power amplification circuit, transformer coupled and amplifying circuit, full-wave rectifying circuit, signal characteristic testing circuit, low-pass filter circuit, on-the-spot junk relay, frequency detecting transformer, lightning protection circuit and third generation interception net;
Said square-wave signal takes place to link to each other with the input end of power amplification circuit and signal characteristic testing circuit respectively with the output terminal of adjustment circuit;
The output terminal of said power amplification circuit links to each other with the input end of amplifying circuit with transformer coupled;
The output terminal of an auxiliary winding of transformer links to each other with the input end of third generation interception net through full-wave rectifying circuit, lightning protection circuit in said transformer coupled and the amplifying circuit, and the output terminal of another auxiliary winding links to each other with the input end of signal characteristic testing circuit;
The main winding of said frequency detecting transformer links to each other through the output terminal of lightning protection circuit with third generation interception net; The output terminal of an auxiliary winding links to each other with the input end of signal characteristic testing circuit, and the output terminal of its another auxiliary winding links to each other with on-the-spot junk relay through low-pass filter circuit;
Said low-pass filter circuit is sent to the signal characteristic testing circuit with its drive signal that provides for on-the-spot junk relay;
Said full-wave rectifying circuit links to each other with lightning protection circuit with amplifying circuit with transformer coupled respectively, is used for transferring AC signal to dc pulse signal and output, thus the interchange characteristic of stick signal and the signal frequency characteristic is provided;
When said interception net adopts the multilayer grid mode, adopt the pulse signal of different frequency, prevent that through the signal frequency of monitoring difference signal from sealing in.
2. device as claimed in claim 1 is characterized in that, said signal characteristic testing circuit and control center adopt data communication interface to realize data interchange.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010534159 CN102060039B (en) | 2010-11-02 | 2010-11-02 | Direct-current pulse driving and detecting device for foreign body sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010534159 CN102060039B (en) | 2010-11-02 | 2010-11-02 | Direct-current pulse driving and detecting device for foreign body sensor |
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| Publication Number | Publication Date |
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| CN102060039A CN102060039A (en) | 2011-05-18 |
| CN102060039B true CN102060039B (en) | 2012-12-05 |
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| CN 201010534159 Expired - Fee Related CN102060039B (en) | 2010-11-02 | 2010-11-02 | Direct-current pulse driving and detecting device for foreign body sensor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104260760A (en) * | 2014-10-15 | 2015-01-07 | 北京世纪瑞尔技术股份有限公司 | Direction control based foreign body invasion limit monitoring system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6895362B2 (en) * | 2003-02-28 | 2005-05-17 | General Electric Company | Active broken rail detection system and method |
| CN101726757A (en) * | 2009-12-16 | 2010-06-09 | 北京佳讯飞鸿电气股份有限公司 | Device for monitoring railway foreign body intrusion by using dynamic signal |
| CN201570108U (en) * | 2009-11-11 | 2010-09-01 | 四川格致科技发展有限公司 | System for monitoring intrusion of foreign bodies |
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2010
- 2010-11-02 CN CN 201010534159 patent/CN102060039B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6895362B2 (en) * | 2003-02-28 | 2005-05-17 | General Electric Company | Active broken rail detection system and method |
| CN201570108U (en) * | 2009-11-11 | 2010-09-01 | 四川格致科技发展有限公司 | System for monitoring intrusion of foreign bodies |
| CN101726757A (en) * | 2009-12-16 | 2010-06-09 | 北京佳讯飞鸿电气股份有限公司 | Device for monitoring railway foreign body intrusion by using dynamic signal |
Non-Patent Citations (1)
| Title |
|---|
| 王彤等."客运专线异物侵限监控系统技术的研究".《铁路计算机应用》.2009,第18卷(第7期),第8-10页. |
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| CN102060039A (en) | 2011-05-18 |
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Granted publication date: 20121205 Termination date: 20201102 |