CN203365616U - Cable fault locating system based on single-chip microcomputer technology - Google Patents
Cable fault locating system based on single-chip microcomputer technology Download PDFInfo
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- CN203365616U CN203365616U CN 201320449715 CN201320449715U CN203365616U CN 203365616 U CN203365616 U CN 203365616U CN 201320449715 CN201320449715 CN 201320449715 CN 201320449715 U CN201320449715 U CN 201320449715U CN 203365616 U CN203365616 U CN 203365616U
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Abstract
The utility model discloses a cable fault locating system based on single-chip microcomputer technology. The cable fault locating system mainly comprises a signal data collector, a data storage apparatus, a P89V51 system control circuit, a man-machine interaction circuit, a display and an address generator, wherein the man-machine interaction circuit is used for operating and setting a position indicator. When the man-machine interaction circuit emits an acquisition command, the signal data collector acquires information and inputs data into the data storage apparatus, the P89V51 system control circuit reads data from the data storage apparatus, analyzes data, determines fault, and inputs results to the CPLD, and a display controller in the CPLD controls the display to displaying the result. The cable fault locating system employs a low-voltage reflection method to measure the return time of reflective pulse and determine the distance of a fault point to the test terminal. The method is simple and direct, and is easy for fault identification and rapid in test speed. The precision for short distance test is high. The cable fault locating system can effectively position open circuit and short circuit of a cable.
Description
Technical field
The utility model relates to technical field of measurement and test, specifically refers to a kind of cable fault positioning system based on singlechip technology.
Background technology
Aircraft is as the representative of high-tech product, its performance and safety more and more depend on the reliability of the electronic equipment on machine, and Aircraft Cables is just connecting these electronic equipments as nerve, once cable is out of joint, just may jeopardize the flight safety of aircraft, so, to the maintenance of Aircraft Cables, be very necessary.And the Aircraft Cables type is very complicated, various radio frequency lines, data line, low-voltage-powered line are arranged, its distance shorter (generally between l～50m), and spread all over whole fuselage, in the casing of dark plant aircraft, so the location of certain root electric cable stoppage has just been become to the very thing of trouble.
External at present, the product of more existing cable location, but these valuable product, bring very large cost pressure to the Domestic Aircraft maintaining unit.And domestic cable detection product is mainly used in the places such as communication, electric power, during location, can destruction be arranged to cable.Aboard, cable distance is short, during detection, can not damage aircraft and parts thereof.
The method of cable fault location generally can be divided into terminal mensuration and trajectory measurement method.Terminal mensuration commonly used comprises capacitance current method, bridge method, pulse reflection method etc.In the detection of power cable.Usually adopt high voltage pulse method, but civil aviaton's cable generally belongs to low-voltage cable, can't bear the voltage of kilovolt on power cable.
The utility model content
The purpose of this utility model is to provide a kind of cable fault positioning system based on singlechip technology, adopts the low pressure reflectometry, and the time of return of measuring reflected impulse carrys out the distance of the localization of faults from test lead.The method simple, intuitive, easily identification, test speed is fast, and the short distance precision is high, can realize the effective location to cable open circuit, short circuit.
The utility model is achieved through the following technical solutions: a kind of cable fault positioning system based on singlechip technology, mainly by the signal data acquisition device, data storage device, the P89V51 system, control circuit, the man-machine interaction circuit, display, address generator six parts form, the man-machine interaction circuit is operation and the setting to orientator for the user, when the man-machine interaction circuit sends acquisition, the Information Monitoring of signal data acquisition device, data are inputted to data storage device, P89V51 system, control circuit reading out data from data storage device, data are carried out to analyzing and processing, failure judgement, be input to again in CPLD, display controller in CPLD shows testing result by display.
Described signal data acquisition device A/D conversion chip adopts the TLC5540 of Texas Instruments company.Be characterized in: there are 8 bit resolutions; High conversion rate reaches 40Msps; Analog input bandwidth >=75MHz (representative value), not only have inner sampling and keep function, also has the internal reference voltage generator.The control of whole chip is very convenient, and the OE end is that output allows end, when OE is low level, allows data output; Otherwise DI～D8 is high-impedance state.ANALOG IN is analog input end, and CLK is input end of clock, the input adjustable side that some other pin is some ground wires, power lead, reference voltage etc.
Described P89V51 system, control circuit main control chip adopts the P89V5lRD2 of Philips company.P89V51 is a 80C51 microcontroller. the data RAM that comprises 64kB Flash and 1024 bytes, cost performance is very high.Its typical characteristics is its X2 mode option.Utilize this characteristic, can make the clock frequency operation of application program with traditional 80C51 clock frequency (each machine cycle comprises 12 clocks) or X2 mode (each machine cycle comprises 6 clocks), select the X2 mode can under identical clock frequency, obtain the handling capacity of 2 times.The support of Flash program storage walks abreast and serial in-system programming (ISP), simple and convenient.Also there are SPI (serial peripheral interface) and enhancement mode UART4 8 I/O mouths; 3 16 bit timing device/counters; Programmable watchdog timer (WDT); 8 interrupt sources, 4 interrupt priority levels; Compatible TTL and CMOS logic level, operating voltage is 5V, operating frequency is 0～40MHz.
Described man-machine interaction circuit adopts keypad to realize operation and the setting of user to orientator.
Described man-machine interaction circuit adopts serial interface circuit to complete data transmission and the control of computer and orientator.
Described serial interface circuit shows diagnostic result by display.
The display driver circuit of described display is integrated in CPLD to dwindle the circuit volume.
Described CPLD selects the EPM7128SLc84 of Atera company, and it is a kind of CPLD, 84 pin PLCC encapsulation.Can realize online programming (ISP) by JTAG (Joint Text Action Group joint test group) interface; 68 programmable I/O mouths, pin only has 5.0ns counter works frequency to reach 151.5MHz to the logical time delay of pin, can meet this sampling system the data access speed required I to have proprietary removing (clear), clock (clock), output enable (OE) to control; Also comprise a programmable program encryption position, the general protection Patent design, the program of preventing is replicated and reads.
Described address generator is connected with data storage device, and address generator is integrated in CPLD.
Compared with prior art, the beneficial effect had is the utility model:
1, adopt the low pressure reflectometry cable fault type of detection place easily and accurately and position thereof, have simple to operate, test the characteristics such as accurate.
2, by address generator and display controller are integrated in CPLD, dwindled the instrument volume, the convenient use.
3, system is used the A/D converter data-carrier store that writes direct, and makes the speed of data acquisition no longer be subject to the restriction of single-chip microcomputer frequency of operation.Allow to carry out the data acquisition up to 40MSPS.Although the sample frequency of native system is higher, it is higher that required integrated circuit only has signal pickup assembly to require.Need high speed device, other controls, display device do not have specific (special) requirements, have reduced cost when having guaranteed performance.
The accompanying drawing explanation
Fig. 1 is that orientator hardware forms schematic diagram.
Embodiment
Below in conjunction with embodiment, the utility model is described in further detail, but embodiment of the present utility model is not limited to this.
Embodiment 1:
As shown in Figure 1, the utility model mainly consists of signal data acquisition device, P89V51 system, control circuit, man-machine interaction circuit three parts, wherein man-machine interaction circuit operation and setting to orientator for the user, when the man-machine interaction circuit sends acquisition, P89V51 controls the data data acquisition unit and starts to gather, after having gathered, by in the image data input control device, carry out analyzing and processing, failure judgement, then shown by display.
It is to be added on cable by pulse producer emission low-voltage high speed pulse signal that the utility model adopts the action of low-voltage pulse reflectometry, pulse signal can produce reflection wave in trouble spot, then run into by analysis the type that the reflected impulse waveform produced after fault is determined fault, the time of return of measuring reflected impulse carrys out the distance of the localization of faults from test lead, the method simple, intuitive, easily identification, test speed is fast, the short distance precision is high, can realize the effective location to cable open circuit, short circuit.
Embodiment 2:
The present embodiment, on the basis of embodiment 1, discloses a kind of cable fault positioning system based on singlechip technology, and in the present embodiment, described signal data acquisition device adopts the TLC5540 of Texas Instruments company.The control of whole chip is very convenient, and the OE end is that output allows end, when OE is low level, allows data output; Otherwise DI～D8 is high-impedance state.ANALOG IN is analog input end, and CLK is input end of clock, the input adjustable side that some other pin is some ground wires, power lead, reference voltage etc.
Further, the utility model P89V51 system, control circuit main control chip adopts the P89V5lRD2 of Philips company.Its typical characteristics is its X2 mode option.Utilize this characteristic, can make the clock frequency operation of application program with traditional 80C51 clock frequency (each machine cycle comprises 12 clocks) or X2 mode (each machine cycle comprises 6 clocks), select the X2 mode can under identical clock frequency, obtain the handling capacity of 2 times.The support of Flash program storage walks abreast and serial in-system programming (ISP), simple and convenient.Also there are SPI (serial peripheral interface) and enhancement mode UART4 8 I/O mouths; 3 16 bit timing device/counters; Programmable watchdog timer (WDT); 8 interrupt sources, 4 interrupt priority levels; Compatible TTL and CMOS logic level.
Further, in the utility model, the man-machine interaction circuit adopts keypad to realize operation and the setting of user's orientator, and complete data transmission and the control of computer and orientator with serial interface circuit, show diagnostic result with display, for dwindling the circuit volume, the display driver circuit of charactron is integrated in CPLD, described CPLD selects the EPM7128SLc84 of Atera company, it is a kind of CPLD, 84 pin PLCC encapsulation.Can realize online programming (ISP) by JTAG (Joint Text Action Group joint test group) interface; 68 programmable I/O mouths, pin only has 5.0ns counter works frequency to reach 151.5MHz to the logical time delay of pin, can meet this sampling system the data access speed required I to have proprietary removing (clear), clock (clock), output enable (OE) to control; Also comprise a programmable program encryption position, the general protection Patent design, the program of preventing is replicated and reads.
The above; it is only preferred embodiment of the present utility model; not the utility model is done to any pro forma restriction, any simple modification, equivalent variations that every foundation technical spirit of the present utility model is done above embodiment, within all falling into protection domain of the present utility model.
Claims (10)
1. the cable fault positioning system based on singlechip technology, it is characterized in that: mainly by the signal data acquisition device, data storage device, the P89V51 system, control circuit, the man-machine interaction circuit, display, address generator six parts form, the man-machine interaction circuit is operation and the setting to orientator for the user, when the man-machine interaction circuit sends acquisition, the Information Monitoring of signal data acquisition device, data are inputted to data storage device, P89V51 system, control circuit reading out data from data storage device, data are carried out to analyzing and processing, failure judgement, be input to again in CPLD, display controller in CPLD shows testing result by display.
2. the cable fault positioning system based on singlechip technology according to claim 1, is characterized in that: described data acquisition unit employing TLC5540.
3. the cable fault positioning system based on singlechip technology according to claim 1, is characterized in that: described P89V51 system, control circuit main control chip employing P89V5lRD2.
4. the cable fault positioning system based on singlechip technology according to claim 1, is characterized in that: described man-machine interaction circuit employing keypad.
5. the cable fault positioning system based on singlechip technology according to claim 1, is characterized in that: described man-machine interaction circuit employing serial interface circuit.
6. the cable fault positioning system based on singlechip technology according to claim 5, it is characterized in that: described serial interface circuit shows diagnostic result by display.
7. the cable fault positioning system based on singlechip technology according to claim 6, it is characterized in that: the display controller of described display is integrated in CPLD.
8. the cable fault positioning system based on singlechip technology according to claim 7, it is characterized in that: described CPLD selects EPM7128SLc84.
9. the cable fault positioning system based on singlechip technology according to claim 1, is characterized in that: also comprise that address generator is connected with data storage device.
10. the cable fault positioning system based on singlechip technology according to claim 9, it is characterized in that: described address generator is integrated in CPLD.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320449715 CN203365616U (en) | 2013-07-26 | 2013-07-26 | Cable fault locating system based on single-chip microcomputer technology |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320449715 CN203365616U (en) | 2013-07-26 | 2013-07-26 | Cable fault locating system based on single-chip microcomputer technology |
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| Publication Number | Publication Date |
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| CN203365616U true CN203365616U (en) | 2013-12-25 |
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| CN 201320449715 Expired - Lifetime CN203365616U (en) | 2013-07-26 | 2013-07-26 | Cable fault locating system based on single-chip microcomputer technology |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103412241A (en) * | 2013-07-26 | 2013-11-27 | 国家电网公司 | Cable fault positioning system based on single-chip microcomputer technology |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103412241A (en) * | 2013-07-26 | 2013-11-27 | 国家电网公司 | Cable fault positioning system based on single-chip microcomputer technology |
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Granted publication date: 20131225 |
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| CX01 | Expiry of patent term |