CN200959622Y - Difference signal transmission line detecting system - Google Patents
Difference signal transmission line detecting system Download PDFInfo
- Publication number
- CN200959622Y CN200959622Y CN 200620124106 CN200620124106U CN200959622Y CN 200959622 Y CN200959622 Y CN 200959622Y CN 200620124106 CN200620124106 CN 200620124106 CN 200620124106 U CN200620124106 U CN 200620124106U CN 200959622 Y CN200959622 Y CN 200959622Y
- Authority
- CN
- China
- Prior art keywords
- signal
- module
- differential signal
- unipolar
- differential
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Dc Digital Transmission (AREA)
Abstract
The utility model discloses a difference signal transmission line detection system, which is used to solve the problem that the circuit structure of the difference signal transmission line detection system able to detect the difference signal transmission line single end open circuit fault is complex in prior technology. The system includes a signal production module, a signal sending module,a signal receiving module, a judgment module, and a transformer arranged on the difference signal transmission line, the utility model realizes the fault detection of the difference signal transmission line in a simple way, and can detect the single end open circuit fault of the difference signal transmission line.
Description
Technical field
The utility model relates to the wireline inspection technology, relates in particular to a kind of differential signal transmission road detection system.
Background technology
Differential signal transmission is to utilize the opposite signal of a pair of physical conductor transmission voltage phase place to realize jamproof signal transmission technology.See also Fig. 1, this figure is the anti-interference schematic diagram of differential signal, and the primary signal of transmitting terminal becomes two low-voltage differential signal A+ and A-after treatment, (A+)-(A-) equals primary signal.Because the consistency of transmission line cabling so differential signal A+ is consistent with the interference that A-is subjected on transmission line, that is to say, it is the same disturbing the stack to A+ and A-, and interference is added to and obtains signal B+ and B-behind A+ and the A-.After receiving terminal is received B+ and B-, they are subtracted each other to offset interference, can obtain primary signal.
It is very extensive that differential signal is used in various circuit design, and common standard has RS485, RS422, LVDS (Low Voltage Differential Signaling, Low Voltage Differential Signal) etc.When in the prior art differential signal transmission road being detected, method commonly used is at differential signal transmitting terminal input test signal, at the differential signal receiving terminal correctness of the signal received is judged that the differential signal transmission road detection system to this method of available technology adopting describes below:
See also Fig. 2, this figure is the structured flowchart of a kind of differential signal transmission road detection system in the prior art, it mainly comprises signal generator module 20, signal transmitting module 21, signal receiving module 22 and judge module 23, wherein signal generator module 20 is used to produce unipolar signal, and the unipolarity test signal that produces is sent to signal transmitting module 21 and judge module 23 respectively; Signal transmitting module 21 and signal receiving module 22 are positioned at the two ends on differential signal transmission road, signal transmitting module 21 sends by the differential signal transmission road after being used for the unipolar signal that signal generator module 20 produces is converted to differential signal, signal receiving module 22 is used to receive the differential signal that transmits by the differential signal transmission road, exports to judge module 23 after being converted into unipolar signal; The binary sequence of the unipolar signal that the binary sequence of the signal of 23 pairs of signal receiving modules of judge module, 22 outputs and signal generator module 20 produce is compared, the output comparison result.If the unipolar signal that comparison result shows signal generator module 20 produces is consistent with the unipolar signal of signal receiving module 22 outputs, then tested differential signal transmission road is normal, otherwise, tested differential signal transmission road fault.
When utilizing said detecting system that the differential signal transmission road is detected, signal generator module 20 can not be connected with judge module 23 yet, in this case, signal generator module 20 utilizes specific coding protocol to produce the unipolar signal that has check digit, and with its input signal sending module 21, after the unipolar signal that signal transmitting module 21 produces signal generator module 20 is converted to differential signal, by the differential signal transmission road differential signal transmission is arrived signal receiving module 22, signal receiving module 22 is converted to unipolar signal with the differential signal of receiving and outputs to judge module 23, and judge module 23 is judged that the check digit of signal of signal receiving module 22 output is whether correct and exported judged result.If the judgment result displays check digit is correct, then tested differential signal transmission road is normal, otherwise, tested differential signal transmission road fault.
Above-mentioned realization of test system method is simple, cost is lower, but the problem that has single-ended open circuit fault test leakage, reason is: under situation about opening circuit of differential signal transmission road centering, signal receiving module 22 still can be received the differential signal that root transmission line of not opening circuit transmits, it is that signal generator module 20 produces half signal of voltage of signals amplitudes that signal receiving module 22 carries out unipolarity conversion back transmission of electricity pressure amplitude degree to it, because judgement signal 23 is that the binary sequence of the signal of the binary sequence of the signal of signal generator module 20 generations and signal receiving module 22 outputs is compared, its comparison result is consistent, thereby causes the fault detect error.
In order to solve the problem of above-mentioned single-ended open circuit fault test leakage, also there is another differential signal transmission road detection system in the prior art, see also Fig. 3, this figure is the structured flowchart of another kind of differential signal transmission road detection system in the prior art, and it mainly comprises first signal generator module 30, first signal transmitting module 31, first signal receiving module 32, first judge module 33, secondary signal generation module 34, secondary signal sending module 35, secondary signal receiver module 36 and second judge module 37.Wherein first signal generator module 30 is imported first judge module 33 and first signal transmitting module 31 respectively with the unipolar signal that produces, after first signal transmitting module 31 is converted to differential signal with the unipolar signal that receives, the anodal transmission conductor of the anodal differential signal that obtains after the conversion by tested transmission line outputed to anodal differential signal that first signal receiving module, 32, the first signal receiving modules 32 will receive to be converted to unipolar signal and to export to first judge module 33 and carry out correctness and judge.Equally, secondary signal generation module 34 is imported second judge module 37 and secondary signal sending module 35 respectively with the unipolar signal that produces, after secondary signal sending module 35 is converted to differential signal with the unipolar signal that receives, the negative pole transmission conductor of the negative pole differential signal that obtains after the conversion by tested transmission line outputed to secondary signal receiver module 36, and secondary signal receiver module 36 is converted to unipolar signal with the negative pole differential signal that receives and exports to second judge module 37 and carry out correctness and judge.The concrete deterministic process of first judge module 33 and second judge module 37 is identical with deterministic process in the above-mentioned prior art one, repeats no more.The detection system of prior art two can detect the single-ended open circuit fault on differential signal transmission road, but its shortcoming is complex structure, cost is too high, and because the common mode disturbances of differential signal when carrying out single-ended transmission suppresses ability weakens greatly, thereby increased the probability that mistake is surveyed.
The utility model content
The utility model provides a kind of differential signal transmission road detection system, in order to solve the circuit structure complicated problems that can detect the differential signal transmission road detection system of the single-ended open circuit fault in differential signal transmission road in the prior art.
The utility model is by the following technical solutions:
A kind of differential signal transmission road detection system comprises,
Signal generator module produces unipolar signal;
Signal transmitting module, the unipolar signal that signal generator module is produced are converted to behind the differential signal by the output of differential signal transmission road;
Signal receiving module receives the differential signal that the differential signal transmission road is transmitted, and is converted into unipolar signal output;
Judge module determines according to the situation of signal receiving module output unipolar signal whether the differential signal transmission road breaks down; And
Be arranged at the transformer on the differential signal transmission road, be used for the differential signal that the received signal sending module sends, its induced signal is sent to signal receiving module.
The two ends of a winding of described transformer connect the anodal differential signal output and the negative pole differential signal output of signal transmitting module respectively, and the two ends of the secondary winding of described transformer connect the anodal differential signal input and the negative pole differential signal input of signal receiving module respectively.
The loop that a winding of described signal transmitting module and described transformer forms is provided with current-limiting resistance.
The output of described signal generator module also connects described judge module, to described judge module output unipolar signal.
The unit whether binary sequence of the unipolar signal that the binary sequence that described judge module also comprises the unipolar signal that is used to judge signal receiving module output and signal generator module are exported is consistent, if it is consistent, then the differential signal transmission road is normal, otherwise differential signal transmission road fault.
Described signal generator module also comprises the unit that is used for producing according to the predictive encoding agreement unipolar signal that has check digit, sends to have the unipolar signal of check digit to signal transmitting module.
Described judge module also comprises the unit whether binary sequence of the unipolar signal that is used for judging signal receiving module output has the corresponding check digit of unipolar signal that produces with signal generator module, if, then the differential signal transmission road is normal, otherwise differential signal transmission road fault.
Adopt technical scheme described in the utility model, have following beneficial effect:
The differential signal transmission road detection system of technical solutions of the utility model is provided with transformer on the differential signal transmission road, be used for the differential signal that the received signal sending module sends, its induced signal is sent to signal receiving module, signal receiving module sends to judge module after the induced signal that receives is converted to unipolar signal, and judge module determines according to the unipolar signal of signal receiving module output whether the differential signal transmission road is working properly.Thereby simply, mode has realized covering the differential signal transmission road detection mode of single-ended open circuit fault cheaply and because it adopts the mode of two-way transmission differential signal when detecting, so its antijamming capability is stronger with a kind of, and False Rate is low.
Description of drawings
Fig. 1 is the anti-interference schematic diagram of differential signal;
Fig. 2 is the structural representation of the differential signal transmission road detection system of prior art one;
Fig. 3 is the structural representation of the differential signal transmission road detection system of prior art two;
Fig. 4 is the structural representation of the utility model differential signal transmission road detection system.
Embodiment
The differential signal transmission road detection system of technical solutions of the utility model is provided with transformer on the differential signal transmission road, be used for the differential signal that the received signal sending module sends, its induced signal is sent to signal receiving module, signal receiving module sends to judge module after the induced signal that receives is converted to unipolar signal, and judge module determines according to the unipolar signal of signal receiving module output whether the differential signal transmission road is working properly.The utility model has been realized the fault detect on differential signal transmission road in a simple manner, and can detect the single-ended open circuit fault on differential signal transmission road.
Be explained in detail to the main realization principle of technical solutions of the utility model, embodiment and to the beneficial effect that should be able to reach below in conjunction with each accompanying drawing.
See also Fig. 4, this figure is the structural representation of the utility model differential signal transmission road detection system, it mainly comprises signal generator module 50, signal transmitting module 51, transformer 52, signal receiving module 53 and judge module 54, and the main effect of wherein respectively forming module is as follows:
Signal generator module 50 is used for producing time dependent unipolar binary sequence according to predefined specific coding agreement;
The working method of signal generator module 50 has two kinds, is illustrated respectively below:
First kind of working method is: signal generator module 50 produces time dependent unipolar binary sequence according to predefined specific coding agreement, and with its difference input signal sending module 51 and judge module 54;
Second kind of working method is: signal generator module 50 produces the time dependent unipolar binary sequence that has check digit according to predefined specific coding agreement, with its input signal sending module 51.
Signal transmitting module 51 connects described signal generator module 50, is used for the unipolar signal that signal generator module 50 produces is converted to behind the differential signal by the output of differential signal transmission road.
Transformer 52 is arranged on the differential signal transmission road between signal transmitting module 51 and the signal receiving module 52, is used for the differential signal that received signal sending module 51 sends, and its induced signal is sent to signal receiving module 53.The two ends of a winding of transformer 52 connect the anodal differential signal output and the negative pole differential signal output of signal transmitting module 51 respectively, and the two ends of the secondary winding of transformer 52 connect the anodal differential signal input and the negative pole differential signal input of signal receiving module 53 respectively;
When open circuit fault takes place in the loop that a winding of signal transmitting module 51 and transformer 52 forms, the non-inductive signal of the secondary winding of transformer 52 produces, the differential signal input that is signal receiving module 53 does not receive input signal, thereby causes signal receiving module 53 no unipolar signal outputs.
Signal receiving module 53, connection transformer 52 are used for the differential signal that receiving transformer 52 is exported, and are converted into unipolar signal output.
Judge module 54, connect signal receiving module 53, be used for determining according to the situation of signal receiving module 53 output unipolar signals whether the differential signal transmission road breaks down, when judge module 54 can not receive the unipolar signal that signal receiving module 53 sends, can determine that open circuit fault takes place on the differential signal transmission road.
When signal generator module 50 adopts above-mentioned first kind of working method, judge module 54 judges whether the binary sequence of the unipolar signal that signal receiving module 53 is exported is consistent with the binary sequence of the unipolar signal of signal generator module 50 outputs, if it is consistent, then the differential signal transmission road is normal, otherwise differential signal transmission road fault.
When signal generator module 50 adopts above-mentioned second kind of working method, judge module 54 judges in the binary sequence of unipolar signal of signal receiving module 53 output whether have the corresponding check digit of unipolar signal that produces with signal generator module 50, if, then the differential signal transmission road is normal, otherwise differential signal transmission road fault.
Preferably, direct current signal damages transformer 52 in order to prevent from not have communication data, can further be provided with current-limiting resistance 55 on the loop that a winding of described signal transmitting module 50 and described transformer 52 forms.
During the differential signal transmission road of the differential signal that detected transmission is dissimilar, the parameter of transformer 52 in the detection system of differential signal transmission of the present utility model road and current-limiting resistance 55 there is different requirements, is illustrated for example below:
Requiring the operating frequency of transformer 52 during the differential signal transmission road of the differential signal of detected transmission RS485 and RS422 type is 100Hz-2MHz, winding internal resistance＜50 of transformer 52 ohm, and the resistance of current-limiting resistance 55 is 100 ohm.
Requiring the operating frequency of transformer 52 during the differential signal transmission road of the differential signal of detected transmission LVDS type is 1MHz-1GHz, winding internal resistance＜20 of transformer 52 ohm, and the resistance of current-limiting resistance 55 is divided into 20 ohm.
Below only with preferred embodiment the utility model is described, those skilled in the art can carry out various changes and modification to the utility model and not break away from spirit and scope of the present utility model.Like this, if of the present utility model these are revised and modification belongs within the scope of the utility model claim and equivalent technologies thereof, then the utility model also is intended to comprise these changes and modification interior.
Claims (7)
1, a kind of differential signal transmission road detection system is characterized in that, comprise,
Signal generator module produces unipolar signal;
Signal transmitting module, the unipolar signal that signal generator module is produced are converted to behind the differential signal by the output of differential signal transmission road;
Signal receiving module receives the differential signal that the differential signal transmission road is transmitted, and is converted into unipolar signal output;
Judge module determines according to the situation of signal receiving module output unipolar signal whether the differential signal transmission road breaks down; And
Be arranged at the transformer on the differential signal transmission road, be used for the differential signal that the received signal sending module sends, its induced signal is sent to signal receiving module.
2, the system as claimed in claim 1, it is characterized in that, the two ends of a winding of described transformer connect the anodal differential signal output and the negative pole differential signal output of signal transmitting module respectively, and the two ends of the secondary winding of described transformer connect the anodal differential signal input and the negative pole differential signal input of signal receiving module respectively.
3, the system as claimed in claim 1 is characterized in that, the loop that a winding of described signal transmitting module and described transformer forms is provided with current-limiting resistance.
4, the system as claimed in claim 1 is characterized in that, the output of described signal generator module also connects described judge module, to described judge module output unipolar signal.
5, system as claimed in claim 4, it is characterized in that, the unit whether binary sequence of the unipolar signal that the binary sequence that described judge module also comprises the unipolar signal that is used to judge signal receiving module output and signal generator module are exported is consistent, if it is consistent, then the differential signal transmission road is normal, otherwise differential signal transmission road fault.
6, the system as claimed in claim 1 is characterized in that, described signal generator module also comprises the unit that is used for producing according to the predictive encoding agreement unipolar signal that has check digit, sends to have the unipolar signal of check digit to signal transmitting module.
7, system as claimed in claim 6, it is characterized in that, described judge module also comprises the unit whether binary sequence of the unipolar signal that is used for judging signal receiving module output has the corresponding check digit of unipolar signal that produces with signal generator module, if, then the differential signal transmission road is normal, otherwise differential signal transmission road fault.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620124106 CN200959622Y (en) | 2006-07-31 | 2006-07-31 | Difference signal transmission line detecting system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620124106 CN200959622Y (en) | 2006-07-31 | 2006-07-31 | Difference signal transmission line detecting system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN200959622Y true CN200959622Y (en) | 2007-10-10 |
Family
ID=38786500
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620124106 Expired - Fee Related CN200959622Y (en) | 2006-07-31 | 2006-07-31 | Difference signal transmission line detecting system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN200959622Y (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009092226A1 (en) * | 2007-12-27 | 2009-07-30 | Huawei Technologies Co., Ltd. | Malfunction detecting method and device for differential signal |
| CN103280206A (en) * | 2013-04-27 | 2013-09-04 | 惠州市德赛西威汽车电子有限公司 | Method for monitoring vehicle-mounted LVDS (Low Voltage Differential Signaling) link |
| CN104218974A (en) * | 2013-05-30 | 2014-12-17 | 英飞凌科技股份有限公司 | Method, Device and Circuitry for Detecting a Failure on a Differential Bus |
| CN110324078A (en) * | 2018-03-30 | 2019-10-11 | 迈普通信技术股份有限公司 | A kind of optical interface differential signal fault detection system and method |
| CN110930914A (en) * | 2019-12-17 | 2020-03-27 | 京东方科技集团股份有限公司 | Signal detection circuit, signal detection method and display device |
| CN110967044A (en) * | 2018-09-28 | 2020-04-07 | 矢崎总业株式会社 | Measuring method, transmission line diagnostic device, detection device, and linear sensor device |
| CN112689102A (en) * | 2020-12-28 | 2021-04-20 | 惠州华阳通用电子有限公司 | Differential video transmission device and method |
-
2006
- 2006-07-31 CN CN 200620124106 patent/CN200959622Y/en not_active Expired - Fee Related
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009092226A1 (en) * | 2007-12-27 | 2009-07-30 | Huawei Technologies Co., Ltd. | Malfunction detecting method and device for differential signal |
| CN101471735B (en) * | 2007-12-27 | 2012-09-05 | 华为技术有限公司 | Device for monitoring differential signal fault |
| CN103280206A (en) * | 2013-04-27 | 2013-09-04 | 惠州市德赛西威汽车电子有限公司 | Method for monitoring vehicle-mounted LVDS (Low Voltage Differential Signaling) link |
| CN103280206B (en) * | 2013-04-27 | 2015-10-14 | 惠州市德赛西威汽车电子股份有限公司 | A kind of vehicle-mounted LVDS link monitoring method |
| CN104218974A (en) * | 2013-05-30 | 2014-12-17 | 英飞凌科技股份有限公司 | Method, Device and Circuitry for Detecting a Failure on a Differential Bus |
| CN104218974B (en) * | 2013-05-30 | 2017-01-04 | 英飞凌科技股份有限公司 | Method, device and circuit arrangement for detecting faults on a differential bus |
| CN110324078A (en) * | 2018-03-30 | 2019-10-11 | 迈普通信技术股份有限公司 | A kind of optical interface differential signal fault detection system and method |
| CN110324078B (en) * | 2018-03-30 | 2022-02-08 | 迈普通信技术股份有限公司 | System and method for detecting optical interface differential signal fault |
| CN110967044A (en) * | 2018-09-28 | 2020-04-07 | 矢崎总业株式会社 | Measuring method, transmission line diagnostic device, detection device, and linear sensor device |
| CN110930914A (en) * | 2019-12-17 | 2020-03-27 | 京东方科技集团股份有限公司 | Signal detection circuit, signal detection method and display device |
| CN112689102A (en) * | 2020-12-28 | 2021-04-20 | 惠州华阳通用电子有限公司 | Differential video transmission device and method |
| CN112689102B (en) * | 2020-12-28 | 2023-12-15 | 惠州华阳通用电子有限公司 | Differential video transmission device and method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN200959622Y (en) | Difference signal transmission line detecting system | |
| CN1171398C (en) | Serial data communication between integrated circuits | |
| CN101034124A (en) | Frequency inverter air conditioner power supply module and testing system and testing method of driving module | |
| CN103424660A (en) | RS-485 communication interface polarity detection device, method and chip | |
| CN101866599B (en) | LED on-line detection control system | |
| CN1870378A (en) | Travelling wave identification method of superhigh voltage DC line fault | |
| CN101324633A (en) | Rotary speed sensor with bus interface for automobile | |
| CN1835459A (en) | Method of automatic detecting sigual transmitting line failare | |
| CN2864704Y (en) | Circuit detecting instrument | |
| CN1767306A (en) | Photoelectricity triggering and detecting system for static reactive-load compensation equipment based on multi-mode optical fibre | |
| CN1553637A (en) | Fault indicating technology for Ethernet optical fibre transceiver | |
| CN2881818Y (en) | Electric vehicle real-time monitoring system | |
| CN201114126Y (en) | Multi- net opening test device | |
| CN1713480A (en) | Synchronized switching controller and its control for parallel uninterrupted power supply | |
| CN111660959A (en) | Physical gear acquisition system and method for pure electric light commercial vehicle | |
| CN101388822A (en) | Automatic pole changing device for CAN bus and method therefor | |
| CN101197073B (en) | Incremental optical-electricity encoder | |
| CN211427481U (en) | Function detection device for electricity consumption information acquisition terminal | |
| CN101324634B (en) | Vehicle speed sensor with bus interface for vehicle | |
| CN212572579U (en) | FPGA-based error code detector | |
| CN201541271U (en) | Partial bus node automatic recovery device | |
| CN114460523A (en) | Straight-through current transformer disconnection and polarity inspection system and control method thereof | |
| CN212966428U (en) | Microcomputer harmonic elimination device with wireless transmission function | |
| CN106160853B (en) | A kind of multi-functional LD driving circuit, module and method | |
| CN100343683C (en) | Method and apparatus for detecting line signal disappearance |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20071010 Termination date: 20100731 |