CN204184378U - A kind of coding circuit - Google Patents
A kind of coding circuit Download PDFInfo
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- CN204184378U CN204184378U CN201420658167.2U CN201420658167U CN204184378U CN 204184378 U CN204184378 U CN 204184378U CN 201420658167 U CN201420658167 U CN 201420658167U CN 204184378 U CN204184378 U CN 204184378U
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- coding
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- track circuit
- circuit
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Abstract
The utility model discloses a kind of coding circuit, comprise 25HZ phase detecting track circuit and coding shift frequency transmitting apparatus, the receiving end of 25HZ phase detecting track circuit and feed end are in series with inductance capacitance box respectively, coding shift frequency transmitting apparatus is connected with the matching box side in transformer box in 25HZ phase detecting track circuit by digital cable, and the opposite side of matching box is connected with the lead-out terminal of impedance transformer.Coding circuit described in the utility model, track circuit information and coding information, by different cable lead-throughs, can reduce mutual interference; Being provided with matching box between coding shift frequency transmitting apparatus and the lead-out terminal of impedance transformer, by arranging matching box, completing cable and Orbit Matching, make coding information output large, improve cab signal entrance electric current.
Description
Technical field
The utility model relates to a kind of coding circuit.
Background technology
In order to ensure traffic safety and improve conveying efficiency, make cab signal and mobile unit continuously can receive ground signal and show incessantly in station, need coding is carried out on the basis of original track circuit in station.Coding circuit conventional is at present the coding of 25HZ phase detecting track circuit superposition two-wire system, this coding circuit completes superposition in indoor, by a pair digital cable to outdoor track equipment, set up isolator at outdoor track, realize the transmission of coding information.This coding circuit, track circuit information and coding information all share a pair digital cable, easily produce interference each other, and if et out of order time, be not easy the fault distinguished from track circuit equipment or coding shift frequency transmitting apparatus, make troubles to maintenance.In addition, this standard coding circuit entrance electric current is less, easily produces and loses code, be difficult to guarantee that cab signal can reliablely and stablely work.
Utility model content
the purpose of this utility model is to provide one can increase entrance electric current, reduces the coding circuit of transmission disturbance.
Coding circuit described in the utility model, comprise 25HZ phase detecting track circuit and coding shift frequency transmitting apparatus, it is characterized in that: the receiving end of 25HZ phase detecting track circuit and feed end are in series with inductance capacitance box respectively, coding shift frequency transmitting apparatus is connected with the matching box side in transformer box in 25HZ phase detecting track circuit by digital cable, and the opposite side of matching box is connected with the lead-out terminal of impedance transformer.
Coding circuit described in the utility model, track circuit information and coding information, by different cable lead-throughs, can reduce mutual interference, if also easily distinguish the fault produced from which end during et out of order.In addition, by being respectively arranged with inductance capacitance box at the receiving end of 25HZ phase detecting track circuit and feed end, this inductance capacitance box makes 25Hz information pass through smoothly, and isolates the coding information of coding shift frequency transmitting apparatus transmission, can reduce mutual interference further.Being provided with matching box between coding shift frequency transmitting apparatus and the lead-out terminal of impedance transformer, by arranging matching box, completing cable and Orbit Matching, make coding information output large, improve cab signal entrance electric current.
Accompanying drawing explanation
Fig. 1 is the utility model coding circuit diagram.
Detailed description of the invention
As shown in Figure 1, the sending of 25 Hz phase detecting track circuit, receiving end are in series with HLC-Y inductance capacitance box respectively.HLC-Y is made up of inductance capacitance, wherein inductance L=2.2H, electric capacity C=4F, and its effect is that 25 Hz information are passed through smoothly, and has buffer action to the coding information sent by coding shift frequency transmitting apparatus.1,2 terminals of HLC-Y box are inductance, and 2,3 terminals are electric capacity.When impedance transformer adopts the BE-600/25 of air-gap-free, feed end uses inductance, receiving end inductance and capacitances in series, and LC series impedance is capacitive, is used for offsetting the inductance that power transmission section increases, two-element relay angular displacement β is remained unchanged substantially.When impedance transformer employing has the BE2-600/25 of air gap, feed end construction inductance, receiving end uses inductance.Because the BE2-600/25 impedance having air gap is 1/3 of the impedance of the BE-600/25 of air-gap-free, namely inductance value is reduced to 1/3.In order to make two-element relay angular displacement β substantially remain unchanged, with the reduction that increase is sent, receiving end inductance offsets BE2-600/25 inductance.So after 25 Hz phase detecting track circuit add coding equipment, the phase angle of former 25 Hz phase detecting track circuit track relays can not be changed.Wherein, feed end HLC-Y (inductance) is Z1=j345 Ω to 25HZ impedance.Be Z2=j27646 Ω to 2000HZ impedance.Because track circuit impedance is low, coding shift information can only to track transmission, and HLC-Y inductance capacitance box plays the effect of isolated coding shift information, prevents track circuit information and coding information from mutually disturbing.
As can be seen from circuit, only add inductance capacitance box at the receiving end that send of 25HZ phase detecting track circuit, coding information is isolated, do not need amendment or supporting upgrading original track circuit arrangement.Track circuit information and the independent cable lead-through of coding information, minimizing interferes with each other, and is convenient to maintenance, is convenient to looking up the fault.
Outdoor chamber installs matching box HBP-A, completes cable and Orbit Matching, makes coding information output large, improves cab signal entrance electric current.
In this coding circuit, 25HZ phase detecting track circuit equipment can use track transformer and the impedance transformer of 50HZ iron core, and unlike 400HZ iron core track transformer and impedance transformer equipment must be adopted in the coding of 25HZ phase detecting track circuit superposition two-wire system, can effectively reduce the cost.
Claims (3)
1. a coding circuit, comprise 25HZ phase detecting track circuit and coding shift frequency transmitting apparatus, it is characterized in that: the receiving end of 25HZ phase detecting track circuit and feed end are in series with inductance capacitance box respectively, coding shift frequency transmitting apparatus is connected with the matching box side in transformer box in 25HZ phase detecting track circuit by digital cable, and the opposite side of matching box is connected with the lead-out terminal of impedance transformer.
2. a kind of coding circuit according to claim 1, is characterized in that: described inductance capacitance box is HLC-Y type inductance capacitance box.
3. a kind of coding circuit according to claim 1, is characterized in that: described matching box is HBP-A type matching box.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420658167.2U CN204184378U (en) | 2014-11-06 | 2014-11-06 | A kind of coding circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420658167.2U CN204184378U (en) | 2014-11-06 | 2014-11-06 | A kind of coding circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204184378U true CN204184378U (en) | 2015-03-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420658167.2U Active CN204184378U (en) | 2014-11-06 | 2014-11-06 | A kind of coding circuit |
Country Status (1)
| Country | Link |
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| CN (1) | CN204184378U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113184012A (en) * | 2021-05-27 | 2021-07-30 | 卡斯柯信号有限公司 | Electronic receiver for 480 track circuit and 480 track circuit |
| CN115892118A (en) * | 2023-01-06 | 2023-04-04 | 中铁通信信号勘测设计院有限公司 | 25Hz phase-sensitive track circuit system |
-
2014
- 2014-11-06 CN CN201420658167.2U patent/CN204184378U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113184012A (en) * | 2021-05-27 | 2021-07-30 | 卡斯柯信号有限公司 | Electronic receiver for 480 track circuit and 480 track circuit |
| CN115892118A (en) * | 2023-01-06 | 2023-04-04 | 中铁通信信号勘测设计院有限公司 | 25Hz phase-sensitive track circuit system |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |