CN105067866A - General voltage test device - Google Patents
General voltage test device Download PDFInfo
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- CN105067866A CN105067866A CN201510501181.0A CN201510501181A CN105067866A CN 105067866 A CN105067866 A CN 105067866A CN 201510501181 A CN201510501181 A CN 201510501181A CN 105067866 A CN105067866 A CN 105067866A
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Abstract
The invention discloses a general voltage test device, comprising a control unit, a PLC unit, a signal collection processing unit, a display unit, a network interface unit and a serial port. The display unit comprises an LED display unit and a Nixie tube display unit, and is used for displaying the voltage test result; the control unit is used for controlling the PLC unit to perform path selection according to the user requirement and setting parameters of the signal collection processing unit; the signal collection processing unit is used for performing detection on DC voltage to be detected, converting the AC voltage to be detected to the DC voltage and performing detection after the AC voltage to be detected is converted to the DC voltage; the signal collection processing unit can detect the voltage range; real-time adjustment can be performed by the control unit according to the range of the voltage to be detected; and the network interface unit and the serial port unit are connected to an external PC upper computer. The general voltage test device provided by the invention can realize multi-batch automatic detection and can detect compatibly detect the AC voltage and the DC voltage, the detectable voltage range is big, the detection efficiency and the accuracy are high and the application range is wide.
Description
Technical field
The invention belongs to voltage tester technical field, more specifically, relate to a kind of common voltage proving installation.
Background technology
Voltage tester of the prior art generally adopts the mode of manual detection, multimeter or oscillograph is adopted to measure, but when voltage way to be tested is more or voltage to be measured is high pressure, the mode inefficiency of manual detection, and safety coefficient is low, be not suitable for plurality of voltages or high-tension test; The method of manual detection, higher to the requirement of test environment, when bad environments or when needing to monitor for a long time, manual type is inappropriate.In prior art, the range of application of voltage test device is all narrower, can not compatibility test direct current with exchange, and the precision comparatively end, larger for the voltage time error testing amplitude little; Great majority belong to the proving installation of customization, once tested object change in voltage, need the test circuit that development and Design is again new, do not possess versatility.
Summary of the invention
For above defect or the Improvement requirement of prior art, the invention provides a kind of common voltage proving installation, its object is to the versatility improving voltage test device.
For achieving the above object, according to one aspect of the present invention, provide a kind of common voltage proving installation, comprise PLC unit, control module and signal acquisition process unit;
Wherein, PLC unit has at least two voltage input ends to be measured, and the first voltage input end to be measured is for receiving DC voltage to be measured, and the second voltage input end to be measured is for receiving alternating voltage to be measured; 5th output terminal of the 3rd input end connection signal acquisition process unit of PLC unit, the voltage signal after receiving via the rectification of signal acquisition process unit and voltage division processing; First output terminal of the control signal input end connection control unit of PLC unit;
The first input end of signal acquisition process unit connects the first output terminal of PLC unit, and the second input end connects the second output terminal of PLC unit, and the 3rd input end connects the 3rd output terminal of PLC unit; Second output terminal of the first control signal input end connection control unit, the 3rd output terminal of the second control signal input end connection control unit;
First to fourth output terminal of first to fourth input end of control module connection signal acquisition process unit successively; Control module adopts FPGA, single-chip microcomputer or DSP to realize;
Wherein, PLC unit under the control of the control unit, select by the output channel carrying out input voltage; Signal acquisition process unit is used for carrying out magnitude of voltage detection to DC voltage to be measured, treats survey alternating voltage, then carries out magnitude of voltage detection again after being converted into DC voltage; Signal acquisition process unit can detect the scope of voltage, is adjusted in real time, make voltage test device have versatility by the scope of control module according to voltage to be measured.
Preferably, signal acquisition process unit comprises the first DC detecting module arranged side by side, the second DC detecting module and exchanges detection module; The input end of the first DC detecting module is as the first input end of signal acquisition process unit, and output terminal is as the first output terminal of signal acquisition process unit; First DC detecting module is for judging voltage to be measured whether within the scope of window voltage, and voltage to be measured is in the outer output low level of window voltage scope, and voltage to be measured then exports high level within the scope of window voltage; Window voltage is adjustable, is arranged flexibly by the scope of control module according to voltage to be measured.
The input end of the second DC detecting module is in parallel with the input end of the first DC detecting module, and output terminal is as the second output terminal of signal acquisition process unit; Second DC detecting module is used for carrying out multiple repairing weld to voltage to be measured and averages, the magnitude of voltage using this mean value as voltage to be measured;
Exchange second input end of first input end as signal acquisition process unit of detection module, second input end is as the 3rd input end of signal acquisition process unit, first output terminal is as the 3rd output terminal of signal acquisition process unit, second output terminal is as the 4th output terminal of signal acquisition process unit, and the 3rd output terminal is as the 5th output terminal of signal acquisition process unit; Exchange detection module to be used for converting AC signal to be measured to DC low-voltage signal, and carry out magnitude of voltage detection;
Selected direct voltage output to be measured to the first DC detecting module or the second DC detecting module by PLC unit; And gating one road alternating voltage sends into interchange detection module in the multichannel AC voltage of input.
Preferably, common voltage proving installation provided by the invention also comprises display unit; Display unit comprises LED display group and numeral method group; 3rd output terminal of the input end connection control unit of LED display group, the 4th output terminal of the input end connection control unit of numeral method group;
The test result that LED display group exports for showing the first DC detecting module, when receiving low level, shiny red, indicates voltage to be measured outside window voltage scope; When receiving high level, bright green, indicates voltage to be measured within the scope of window voltage; The voltage tester value that numeral method group exports for showing the second DC detecting module.
Preferably, common voltage proving installation provided by the invention also comprises many grades of waveres, and the first output terminal connects LED display group, and the second output terminal connects numeral method group; For selecting test result to be shown or numeral method by LED, or LED shows and charactron shows simultaneously;
For only judging the application scenario of voltage whether within the scope of window voltage, can only with LED display, reduce energy consumption and directly perceived; For needing the application scenario testing concrete magnitude of voltage, available numeral method magnitude of voltage.
Preferably, common voltage proving installation provided by the invention also comprises network interface unit and serial port unit, communicates for connecting outside host computer; For the application having man-machine interaction demand, shown test results by the outside host computer be connected with control module; 5th output terminal of the input end connection control unit of network interface unit; 6th output terminal of the input end connection control unit of serial port unit.
Preferably, the first DC detecting module comprises the first signal conditioning circuit and first window comparator circuit, and the input end of the first signal conditioning circuit is as the input end of the first DC detecting module; The input end of first window comparator circuit connects the output terminal of the first signal conditioning circuit, and the output terminal of first window comparator circuit is as the output terminal of the first DC detecting module;
Second DC detecting module comprises secondary signal modulate circuit and the first A/D convertor circuit, the input end of secondary signal modulate circuit is as the input end of the second DC detecting module, the input end of the first A/D convertor circuit connects the output terminal of secondary signal modulate circuit, and the output terminal of the first A/D convertor circuit is as the output terminal of the second DC detecting module;
The enlargement factor that signal conditioning circuit is arranged according to control module, reduces voltage to be measured, avoids the excessive damage circuit of voltage; Or by voltage amplification to be measured, reduce the too little test error caused of amplitude; Whether window comparator circuit is for the voltage signal that judges signal conditioning circuit and export within the scope of window voltage, and the upper and lower bound of window voltage is arranged flexibly by control module; A/D convertor circuit is used for sampling and analog to digital conversion to the voltage signal after conditioning, obtains concrete magnitude of voltage.
Preferably, exchange detection module and comprise rectification circuit, bleeder circuit, the 3rd DC detecting module and the 4th DC detecting module; The input end of rectification circuit is as the input end exchanging detection module, and the input end of bleeder circuit connects the output terminal of rectification circuit, and the output terminal of bleeder circuit is as the 3rd output terminal exchanging detection module;
The input end of the 3rd DC detecting module is as the second input end exchanging detection module, and the output terminal of the 3rd DC detecting module is as the first output terminal exchanging detecting unit;
The input end of the 4th DC detecting module is in parallel with the input end of the 3rd DC detecting module, and the output terminal of the 4th DC detecting module is as the second output terminal exchanging detecting unit;
Wherein, 3rd DC detecting module comprises the 3rd signal conditioning circuit and Second Window comparator circuit, the input end of the 3rd signal conditioning circuit is as the input end of the 3rd DC detecting module, the input end of Second Window comparator circuit connects the output terminal of the 3rd signal conditioning circuit, and the output terminal of Second Window comparator circuit is as the output terminal of the 3rd DC detecting module;
4th DC detecting module comprises the 4th signal conditioning circuit and the second A/D convertor circuit; The input end of the 4th signal conditioning circuit is as the input end of the 4th DC detecting module, and the input end of the second A/D convertor circuit connects the output terminal of the 4th signal conditioning circuit, and the output terminal of the second A/D convertor circuit is as the output terminal of the 4th DC detecting module;
Rectification circuit converts alternating voltage to be measured to DC voltage; This DC voltage amplitude is large, generally higher than 300V, is converted into low-voltage dc signal by bleeder circuit, avoids the damage to circuit; This low-voltage dc signal enters the 3rd DC detecting module or the 4th DC detecting module by PLC unit gating.
Preferably, the control module of common voltage proving installation provided by the invention, PLC unit, signal acquisition process unit, network interface unit, serial port unit and display unit are integrated on one piece of test board, are packaged in a box body.
Preferably, the PLC unit of common voltage proving installation provided by the invention adopts relay array or electronic switch.
In general, the above technical scheme conceived by the present invention compared with prior art, can obtain following beneficial effect:
(1) common voltage proving installation provided by the invention, can arrange the test parameters such as window voltage flexibly by control module, can the compatible test to various web threshold voltage, expands test specification, improves versatility and the range of application of voltage test device; After optimum configurations completes, test can be carried out automatically, and achieve the test duration short, efficiency is high, and accuracy is high;
(2) common voltage proving installation provided by the invention, has DC interface and exchanges interface, and both can survey direct current also can test cross stream, applied range; Less demanding to test environment;
(3) common voltage proving installation provided by the invention, in its preferred version, by signal conditioning circuit according to control module arrange voltage to be measured is amplified after detect again, for the voltage to be measured that amplitude is little, can test error be reduced;
(4) common voltage proving installation provided by the invention, by serial port unit or the external PC host computer of network interface unit, its control module can accept the setting of exterior PC host computer, can perform multiple performance test, meet the individual demand of user according to user's request;
(5) common voltage proving installation provided by the invention, one or more in employing LED, charactron and outside host computer show test results, and according to concrete Test Application environment, can select flexibly; On the other hand, display unit is simple and clear, and user can know which voltage is made mistakes intuitively, and the magnitude of voltage of voltage to be measured, and user can carry out subsequent maintenance and debugging easily;
(6) common voltage proving installation provided by the invention, in its preferred version, be integrated on one piece of test board, be packaged in a box body, its compact conformation, security is high and simple to operate.
Accompanying drawing explanation
Fig. 1 is the overall appearance structural representation of the common voltage proving installation that the embodiment of the present invention provides;
Fig. 2 is the system chart of the common voltage proving installation that the embodiment of the present invention provides;
Fig. 3 is the host computer testing software interface schematic diagram of the common voltage proving installation that the embodiment of the present invention provides;
In all of the figs, identical Reference numeral is used for representing identical element or structure, wherein:
1-LED lamp, 2-charactron, 3-waver, 4-DC voltage input interface, 5-alternating voltage input interface, 6-power interface, 7-RS232 serial ports, 8-network interface, 9-power switch, 10-JTAG debugging interface, 11-ISP download interface.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.In addition, if below in described each embodiment of the present invention involved technical characteristic do not form conflict each other and just can mutually combine.
Common voltage proving installation provided by the invention, comprises control module, PLC unit and signal acquisition process unit;
PLC unit receives DC voltage to be measured and alternating voltage to be measured, and selects output channel under control module effect; The first input end of signal acquisition process unit connects the first output terminal of PLC unit, and the second input end connects the second output terminal of PLC unit, and the 3rd input end connects the 3rd output terminal of PLC unit; First to fourth output terminal of first to fourth input end of control module connection signal acquisition process unit successively; Signal acquisition process unit comprises the first DC detecting module arranged side by side, the second DC detecting module and exchanges detection module; Exchange detection module and comprise rectification circuit, bleeder circuit, the 3rd signal conditioning circuit, Second Window comparator circuit, the 4th signal conditioning circuit and the second A/D convertor circuit; Wherein, the 3rd signal conditioning circuit and Second Window comparator circuit form the 3rd DC detecting module, and the 4th signal conditioning circuit and the second A/D convertor circuit form the 4th DC detecting module;
First DC detecting module is for judging voltage to be measured whether within the scope of window voltage; Second DC detecting module is averaged by multiple repairing weld and is obtained concrete magnitude of voltage; Exchange detection module and then carry out DC detecting for converting AC signal to be measured to DC low-voltage signal;
The output channel that PLC unit is mainly used in input voltage under the effect of control module is selected: for direct current voltage to be measured, is sent into the first DC detecting module of signal acquisition process unit, to judge whether to be within the scope of window voltage by PLC unit gating; Or gating sends into the second direct current detection module of signal acquisition process unit, directly obtains magnitude of voltage; For interchange voltage to be measured, PLC unit gating one road alternating voltage in the multichannel AC voltage of input is sent into and is exchanged detection module; Low-voltage dc signal is converted to after carrying out rectification and voltage division processing via signal acquisition process unit, then gating sends into the 3rd DC detecting module to judge whether to be within the scope of window voltage, or gating sends into the 4th direct current detection module of signal acquisition process unit, directly obtains magnitude of voltage;
Control module adopts the programmable logic device (PLD) such as FPGA, DSP or single-chip microcomputer; The enlargement factor of the upper voltage limit of window comparator circuit and lower voltage limit, signal conditioning circuit is arranged flexibly by control module.
The common voltage proving installation that the embodiment of the present invention provides comprises PLC unit, first window comparator circuit, Second Window comparator circuit, the first signal conditioning circuit, secondary signal modulate circuit, the 3rd signal conditioning circuit, the 4th signal conditioning circuit, the first A/D convertor circuit, the second A/D convertor circuit, rectification circuit, bleeder circuit, Programmable Logic Controller, LED display unit and numeral method unit, be all integrated on one piece of test board;
Embodiment provides the surface structure of common voltage proving installation as shown in Figure 1, and LED 1, charactron 2, waver 3 are arranged on box surface; Contract side is provided with DC voltage input interface 4, alternating voltage input interface 5, power interface 6, RS232 serial ports 7, network interface 8, power switch 9, JTAG debugging interface 10 and ISP download interface 11;
Wherein, LED 1 comprises 16 red LED lamp, 16 green LED lamp; Charactron 2 comprises 16 group of four figures pipes; Test result display format is selected by waver 3; DC voltage input interface 4 and alternating voltage input interface 5 are for being connected voltage to be measured; Power interface 6 for connecting external power source, for this proving installation is powered; RS232 serial ports 7 and network interface 8 are for being connected outside upper PC; Power switch 9 is for opening or powered-down; JTAG debugging interface 10 is debugged for programmable controller program; ISP download interface 11 is downloaded for programmable controller program.
Figure 2 shows that the system chart of the common voltage proving installation that embodiment provides, PLC unit has two voltage input ends to be measured, and the first voltage input end to be measured is for receiving DC voltage to be measured, and the second voltage input end to be measured is for receiving alternating voltage to be measured; 5th output terminal of the 3rd input end connection signal acquisition process unit of PLC unit, the voltage signal after receiving via the rectification of signal acquisition process unit and voltage division processing; First output terminal of the control signal input end connection control unit of PLC unit;
The first input end of signal acquisition process unit connects the first output terminal of PLC unit, and the second input end connects the second output terminal of PLC unit, and the 3rd input end connects the 3rd output terminal of PLC unit; Second output terminal of the first control signal input end connection control unit, Received signal strength conditioning circuit parameter information, the 3rd output terminal of the second control signal input end connection control unit, receive window comparator circuit parameter information;
First to fourth output terminal of first to fourth input end of control module connection signal acquisition process unit successively; Signal acquisition process unit comprises the first DC detecting module arranged side by side, the second DC detecting module and exchanges detection module;
First DC detecting module comprises the first signal conditioning circuit and first window comparator circuit, and the input end of the first signal conditioning circuit is as the input end of the first DC detecting module; The input end of first window comparator circuit connects the output terminal of the first signal conditioning circuit, and the output terminal of first window comparator circuit is as the output terminal of the first DC detecting module;
Second DC detecting module comprises secondary signal modulate circuit and the first A/D convertor circuit, the input end of secondary signal modulate circuit is as the input end of the second DC detecting module, the input end of the first A/D convertor circuit connects the output terminal of secondary signal modulate circuit, and the output terminal of the first A/D convertor circuit is as the output terminal of the second DC detecting module;
Exchange detection module and comprise rectification circuit, bleeder circuit, the 3rd DC detecting module and the 4th DC detecting module; The input end of rectification circuit is as the input end exchanging detection module, and the input end of bleeder circuit connects the output terminal of rectification circuit, and the output terminal of bleeder circuit is as the 3rd output terminal exchanging detection module;
The input end of the 3rd DC detecting module is as the second input end exchanging detection module, and the output terminal of the 3rd DC detecting module is as the first output terminal exchanging detecting unit;
The input end of the 4th DC detecting module is in parallel with the input end of the 3rd DC detecting module, and the output terminal of the 4th DC detecting module is as the second output terminal exchanging detecting unit;
Wherein, 3rd DC detecting module comprises the 3rd signal conditioning circuit and Second Window comparator circuit, the input end of the 3rd signal conditioning circuit is as the input end of the 3rd DC detecting module, the input end of Second Window comparator circuit connects the output terminal of the 3rd signal conditioning circuit, and the output terminal of Second Window comparator circuit is as the output terminal of the 3rd DC detecting module;
4th DC detecting module comprises the 4th signal conditioning circuit and the second A/D convertor circuit; The input end of the 4th signal conditioning circuit is as the input end of the 4th DC detecting module, and the input end of the second A/D convertor circuit connects the output terminal of the 4th signal conditioning circuit, and the output terminal of the second A/D convertor circuit is as the output terminal of the 4th DC detecting module;
Alternating voltage becomes DC voltage after rectification circuit, and because amplitude is large, generally higher than 300V, need bleeder circuit to be transformed in rational test specification, the method for testing according to DC voltage after conversion processes; Selected direct voltage output to be measured to the 3rd DC detecting module or the 4th DC detecting module by PLC unit.
The common voltage proving installation that embodiment provides can test 12 groups of DC voltage simultaneously, represents with V1 to V12; And 4 groups of alternating voltages, represent with AC1 to AC4; Employ 16 groups of input interfaces and 16 groups of output interfaces of PLC unit:
V1 to V12 totally 12 groups of DC voltage inputs from DC voltage input interface 4, and AC1 to AC4 totally 4 groups of alternating voltages inputs from alternating voltage input interface 5;
When the DC voltage to be measured lower than 36V is input to the DC voltage input port of PLC unit, input voltage carries out path selection through PLC unit, enters and adopts window comparator circuit test to judge or enter A/D convertor circuit to carry out voltage magnitude detection; For DC voltage value, adopt window comparator circuit to detect voltage to be measured whether within the scope of window voltage, detection speed is fast but concrete magnitude of voltage can not be obtained; Adopt A/D convertor circuit to detect and can obtain concrete magnitude of voltage, but average because of needs multiple repairing weld, detection speed comparatively window comparator circuit is slightly slow; Adopt before window comparator circuit and A/D convertor circuit detect, voltage to be measured all to need through signal conditioning circuit by voltage amplification or narrow down to suitable test specification, avoid voltage to cross conference and damage circuit, or the too small test error of voltage to be larger.
The common voltage proving installation that embodiment provides, rectification circuit adopts a rectifier bridge to realize, and once can only process a road ac input signal; When the totally 4 alternating voltage input ac voltage to be measured input ports, tunnel of AC1 to the AC4 lower than 380V, PLC unit carries out output channel selection under the control of Programmable Logic Controller, and a choosing wherein road alternating voltage is delivered to rectification circuit;
The mode accessed in turn taked by the proving installation that the present embodiment provides, and AC1 to AC4 connected successively every 10 seconds, with 40 seconds for cycle period; The AC signal to be measured of input converts DC low-voltage signal to after rectification and voltage division processing, again enter PLC unit, Programmable Logic Controller again control PLC unit carries out output channel selection, selects the 3rd DC voltage testing circuit or the 4th DC voltage testing circuit of voltage entering signal acquisition process unit.
The window comparator circuit of the common voltage proving installation that embodiment provides adopts the potentiometer AD5242 able to programme of ADI, there is two-way adjustable potentiometer, two-way voltage can be obtained, as upper voltage limit and the lower voltage limit of window comparator circuit under Controlled by Programmable Controller;
The A/D convertor circuit of the common voltage proving installation that embodiment provides adopts the AD7265 of ADI, provides 6 tunnel differential voltage input tests or 12 tunnel single ended voltage input tests; Signal conditioning circuit adopts programmable amplifier chip PGA280, and the signal of 4 passages can be provided to export and zoom in or out function, enlargement factor can be set to 1/8, and 1/4,1/2,1,2,4,8,16,32,64,128; By Controlled by Programmable Controller PGA280, enlargement factor is set.
Its course of work specifically set forth by the common voltage proving installation provided below in conjunction with embodiment:
By Serial Port Line or netting twine, the serial ports of external upper PC and common voltage proving installation or network interface are connected, according to the scope of voltage to be measured, circuit parameter in signalization acquisition process unit, comprises the upper voltage limit and lower voltage limit etc. of AD5242 in the enlargement factor of PGA280 in signal conditioning circuit, window comparator circuit;
DC voltage to be measured is introduced by wire on the DC voltage input interface 4 of voltage test device, alternating voltage to be measured is introduced by wire on the alternating voltage input interface 5 of voltage test device;
Wherein, the processing mode of common voltage proving installation to alternating voltage and DC voltage is slightly different, specific as follows:
(1) for direct current measured signal, the DC voltage inputted by DC voltage input interface 4 is input to the DC voltage input port of PLC unit, Controlled by Programmable Controller PLC unit carries out output channel selection, select this voltage entering signal first DC detecting unit, still enter the second DC detecting unit;
(2) for interchange measured signal, the alternating voltage inputted by alternating voltage input interface 5 is input to the alternating voltage input port of PLC unit; Four groups of alternating voltages are with 40 seconds for loop cycle is connected, and AC1 to AC4 connected successively every 10 seconds;
Carry out output channel selection by Controlled by Programmable Controller PLC unit, gating one road alternating voltage enters into rectification circuit and the bleeder circuit of signal acquisition process unit; The AC signal to be measured of input converts DC low-voltage signal to after rectification and voltage division processing, again enter PLC unit, Programmable Logic Controller again control PLC unit carries out output channel selection, determine the 3rd DC detecting unit of this voltage entering signal acquisition process unit, or the 4th DC detecting unit of entering signal acquisition process unit;
Judgement process is carried out by the Output rusults of Programmable Logic Controller to the output level of window comparator circuit and A/D convertor circuit; Shown test results by LED 1 and charactron 2; This road voltage tester erroneous results of the red bright expression of LED 1, this road voltage tester result of the green bright expression of LED 1 are correct, and charactron 2 directly shows the concrete magnitude of voltage of this path; For the vdct to be measured of 5V, its window voltage scope is arranged on 4.9V ~ 5.1V; Be less than 4.9V when voltage to be measured or be greater than 5.1V, window comparator circuit output low level, red LED is bright, represents that voltage is beyond window voltage scope; When voltage to be measured is between 4.9V ~ 5.1V, window comparator circuit exports high level, and green LED is bright, represents that voltage to be measured is within the scope of window voltage; If the magnitude of voltage of voltage to be measured need be obtained, then read the numerical value that charactron 2 shows.
3 grades of waveres 3 on voltage test device, for arranging the display mode of test result, can be shown by LED 1 or being shown by charactron 2 or be shown in charactron 2 by LED 1 and show simultaneously; Selected flexibly according to embody rule occasion and application demand by user;
Man-machine interaction being had to the user of requirement, external PC host computer can be adopted to show test results, is the test interface schematic diagram of host computer external in the embodiment of the present invention shown in Fig. 3;
For red, LED on test interface represents that this road voltage to be measured exceeds window voltage scope, for green, LED represents that this road voltage to be measured is within the scope of window voltage; Often organize corresponding the read output text box of input voltage, in text box, show the concrete magnitude of voltage of this road test voltage.
User can carry out follow-up maintenance and debugging according to test result to voltage to be measured; The common voltage proving installation that the present embodiment provides, selected circuit can meet testing requirement; But user still can select kind or the model of Programmable Logic Controller, window comparator circuit, signal conditioning circuit, A/D convertor circuit, rectification circuit, bleeder circuit as required;
The common voltage proving installation that the present embodiment provides, by external PC host computer, the parameter such as upper voltage limit and lower voltage limit of its enlargement factor, window comparator circuit is set flexibly, the test to multiple plurality of voltages can be realized, be not limited to the test of single kind voltage, there is feature efficient, that security is high, simple to operate, applied widely.
Those skilled in the art will readily understand; the foregoing is only preferred embodiment of the present invention; not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. a common voltage proving installation, is characterized in that, comprises PLC unit, control module and signal acquisition process unit;
The first input end of described PLC unit and the second input end all as voltage input interface to be measured, the 5th output terminal of the 3rd input end connection signal acquisition process unit; First output terminal of control signal input end connection control unit; PLC unit is used for carrying out path selection under the control of the control unit;
The first input end of described signal acquisition process unit connects the first output terminal of PLC unit, second input end connects the second output terminal of PLC unit, 3rd input end connects the 3rd output terminal of PLC unit, second output terminal of the first control signal input end connection control unit, the 3rd output terminal of the second control signal input end connection control unit; Described signal acquisition process unit is for detecting DC voltage and alternating voltage;
First to fourth output terminal of first to fourth input end of described control module connection signal acquisition process unit successively; Signal acquisition process unit can detect the scope of voltage, is adjusted in real time, make voltage test device have versatility by the scope of control module according to voltage to be measured.
2. common voltage proving installation as claimed in claim 1, it is characterized in that, described signal acquisition process unit comprises the first DC detecting module arranged side by side, the second DC detecting module and exchanges detection module;
The input end of described first DC detecting module is as the first input end of signal acquisition process unit, and output terminal is as the first output terminal of signal acquisition process unit; First DC detecting module is for judging voltage to be measured whether within the scope of window voltage, and voltage to be measured is in the outer output low level of window voltage scope, and voltage to be measured then exports high level within the scope of window voltage; Described window voltage is arranged according to the scope of voltage to be measured by control module;
The input end of described second DC detecting module is in parallel with the input end of the first DC detecting module, and output terminal is as the second output terminal of signal acquisition process unit; Second DC detecting module is used for carrying out multiple repairing weld to voltage to be measured and averages, the magnitude of voltage using this mean value as voltage to be measured;
The first input end of described interchange detection module is as the second input end of signal acquisition process unit, second input end is as the 3rd input end of signal acquisition process unit, first output terminal is as the 3rd output terminal of signal acquisition process unit, second output terminal is as the 4th output terminal of signal acquisition process unit, and the 3rd output terminal is as the 5th output terminal of signal acquisition process unit; Exchange detection module to be used for converting AC signal to be measured to DC low-voltage signal, and voltage detecting is carried out to described DC low-voltage signal.
3. common voltage proving installation as claimed in claim 1 or 2, is characterized in that, also comprise display unit; Described display unit comprises LED display group and numeral method group; 3rd output terminal of the input end connection control unit of LED display group, the 4th output terminal of the input end connection control unit of numeral method group;
Described LED display group is used to indicate voltage to be measured whether within the scope of window voltage, and numeral method group is for showing the test value of voltage to be measured.
4. common voltage proving installation as claimed in claim 1 or 2, is characterized in that, also comprise many grades of waveres, and its first output terminal connects LED display group, and the second output terminal connects numeral method group; Described many grades of waveres are shown or numeral method by LED for selecting test result, or LED shows and charactron shows simultaneously.
5. common voltage proving installation as claimed in claim 1 or 2, is characterized in that, also comprise network interface unit and serial port unit, the 5th output terminal of the input end connection control unit of network interface unit; 6th output terminal of the input end connection control unit of serial port unit; Described network interface unit and serial port unit are for being connected outside host computer.
6. common voltage proving installation as claimed in claim 2, it is characterized in that, described first DC detecting module comprises the first signal conditioning circuit and first window comparator circuit, and the input end of the first signal conditioning circuit is as the input end of the first DC detecting module; The input end of first window comparator circuit connects the output terminal of the first signal conditioning circuit, and the output terminal of first window comparator circuit is as the output terminal of the first DC detecting module;
Second DC detecting module comprises secondary signal modulate circuit and the first A/D convertor circuit, the input end of secondary signal modulate circuit is as the input end of the second DC detecting module, the input end of the first A/D convertor circuit connects the output terminal of secondary signal modulate circuit, and the output terminal of the first A/D convertor circuit is as the output terminal of the second DC detecting module;
First signal conditioning circuit and the enlargement factor of secondary signal modulate circuit all for arranging according to control module, reduce voltage to be measured, avoids the excessive damage circuit of voltage, or by voltage amplification to be measured, reduce the too little test error caused of amplitude; Whether described window comparator circuit is for the voltage signal that judges signal conditioning circuit and export within the scope of window voltage, and the upper and lower bound of window voltage is arranged flexibly by control module; Described A/D convertor circuit is used for sampling and analog to digital conversion to the voltage signal after conditioning.
7. the common voltage proving installation as described in claim 2 or 6, is characterized in that, described interchange detection module comprises rectification circuit, bleeder circuit, the 3rd DC detecting module and the 4th DC detecting module; The input end of described rectification circuit is as the input end exchanging detection module, and the input end of bleeder circuit connects the output terminal of rectification circuit, and the output terminal of bleeder circuit is as the 3rd output terminal exchanging detection module;
The input end of described 3rd DC detecting module is as the second input end exchanging detection module, and the output terminal of the 3rd DC detecting module is as the first output terminal exchanging detecting unit;
The input end of described 4th DC detecting module is in parallel with the input end of the 3rd DC detecting module, and the output terminal of the 4th DC detecting module is as the second output terminal exchanging detecting unit;
Described 3rd DC detecting module comprises the 3rd signal conditioning circuit and Second Window comparator circuit, the input end of the 3rd signal conditioning circuit is as the input end of the 3rd DC detecting module, the input end of Second Window comparator circuit connects the output terminal of the 3rd signal conditioning circuit, and the output terminal of Second Window comparator circuit is as the output terminal of the 3rd DC detecting module;
Described 4th DC detecting module comprises the 4th signal conditioning circuit and the second A/D convertor circuit; The input end of the 4th signal conditioning circuit is as the input end of the 4th DC detecting module, and the input end of the second A/D convertor circuit connects the output terminal of the 4th signal conditioning circuit, and the output terminal of the second A/D convertor circuit is as the output terminal of the 4th DC detecting module;
Described rectification circuit converts alternating voltage to be measured to DC voltage, by bleeder circuit, described DC voltage is converted to low-voltage dc signal, enters the 3rd DC detecting module or the 4th DC detecting module by low-voltage dc signal described in PLC unit gating.
8. the common voltage proving installation as described in any one of claim 1 or 3 or 5, it is characterized in that, described control module, PLC unit, signal acquisition process unit, network interface unit, serial port unit and display unit are integrated on one piece of test board, are packaged in a box body.
9. common voltage proving installation as claimed in claim 1, is characterized in that, described PLC unit adopts relay array or electronic switch.
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