CN102478596B - A kind of AO signal regulating device - Google Patents
A kind of AO signal regulating device Download PDFInfo
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- CN102478596B CN102478596B CN201010553098.5A CN201010553098A CN102478596B CN 102478596 B CN102478596 B CN 102478596B CN 201010553098 A CN201010553098 A CN 201010553098A CN 102478596 B CN102478596 B CN 102478596B
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Abstract
The present invention relates to a kind of AO signal regulating device, relate to automation control area, particularly digital instrument Ore-controlling Role test, comprises distributor plate and signal regulating panel.The external circuit part of AO signal condition and signal condition part are provided separately by this programme, so just can according to the number of actual test signal, the quantity of reasonable arrangement signal regulating panel, avoids the waste of signal regulating panel, saves set-up time and installing space simultaneously.Voltage signal utilizes and amplifies electric current output and the voltage output that modulate circuit can obtain corresponding precision after voltage/current conversion circuit, realizes the voltage and current signal of voltage signal conditioning for having the test specification that transfinites in same functional module.Overvoltage crowbar can prevent signal voltage on line from transfiniting.Interchannel signal in signal regulating panel can carry out wire jumper setting as required, can output current signal also exportable voltage signal.
Description
Technical field
The present invention relates to automation control area, be specifically related to the signal regulating device between digitizer Ore-controlling Role and virtual test technology.
Background technology
Current digitizer Ore-controlling Role because of its there is the numerous signal type of process, control huge signalling channel quantity, the ability such as the logical relation of configuration complexity and make the test job of system become huge and very complicated, usually automatic test is carried out to improve testing efficiency and reliability by means of virtual test technology, but incompatible between the signal of digital instrument Ore-controlling Role and the signal of virtual test technology, therefore just need the conditioning carrying out interface signal.
The AO signal that digitizer Ore-controlling Role can gather generally is divided into current signal and voltage signal, range of current is 4 ~ 20mA, voltage range is 0 ~ 10V, and can realize on same unit module, effective AO signal maximum that current virtual test technology and signal condition product generally can provide can not exceed above-mentioned scope, cannot realize for the output requirement exceeding range of signal, therefore cannot carry out the test of transfiniting of signal.
Existing AO signal condition product mostly is the conditioning of single class signal, and single board can only complete the conversion of a class signal, can not realize the signal condition of curtage simultaneously, and such structure is unfavorable for the Integrated design of equipment, makes final equipment volume huge.Also have some AO signals adjustment board upper channel quantity more, but the flexible cutting that can not use according to actual conditions realization and expansion, easily cause passage to waste.Most AO signal condition product adopts board form to be installed within cabinet or in the housing closed, and is not easy to flexible installation when testing and fixes, especially undesirable especially to testing in space and the conditional rack of wiring.High voltage can be caused in addition under mis-wired or other fortuitous events, high electric current burns hardware device, existing AO signal regulating device not take signal quarantine measures, to ensure the operation that AO signal regulating device is safe and reliable yet.
Summary of the invention
For solve above-mentioned own function singleness that AO signal regulating panel exists, passage can not cutting and expansion flexibly, test specification is narrow and security own is low problem, the invention provides a kind of there is path protection function, signal transfinites test function, voltage signal can be adjusted to that curtage signal exports, passage can flexible expansion cutting, structure be convenient to install the AO signal regulating device fixed.Concrete scheme is as follows:
A kind of AO signal regulating device, is characterized in that, comprise distributor plate and signal regulating panel.
Another preferred version of the present invention: described distributor plate is provided with signal input interface and signal output interface, described signal adjustment plate is provided with conditioned signal input interface, signal conditioning circuit and conditioned signal output interface, and the signal output interface of described distributor plate is connected by connector with the conditioned signal input interface of signal regulating panel.
Another preferred version of the present invention: the signal input interface on described distributor plate is one, signal output interface is four, signal input interface is one group with 8 signalling channels and the test signal of reception is given each signal output interface, distributor plate is provided with the voltage conversion circuit of external input voltage, each signal regulating panel is responsible for the test signal of conditioning 8 signalling channels.
Another preferred version of the present invention: described external input voltage is 24V, the system standard voltage exported through voltage conversion circuit be ± 15V and+5V voltage.
Another preferred version of the present invention: the connector between described distributor plate and signal regulating panel adopts DB37 connector.
Another preferred version of the present invention: the line length > 0.5 meter of described DB37 connector and < 6 meters.
Another preferred version of the present invention: described signal conditioning circuit is provided with:
After preventing input signal malleation or negative pressure from surprisingly exceeding safe range, forward direction and back element are produced to the passage overvoltage crowbar of harm;
Input signal is carried out to the voltage modulate circuit of signal gain regulation output, described voltage modulate circuit comprises operational amplifier U1 unit, and described operational amplifier U1 unit comprises operational amplifier A, B;
The biased modulate circuit increasing bias voltage is carried out to the voltage of gain circuitry output;
For the voltage signal of output being changed over the voltage/current conversion circuit that current signal exports;
The electric current that voltage/current translation circuit is changed is carried out the current regulating circuit of gain.
Wherein passage overvoltage crowbar is connected with voltage modulate circuit, voltage modulate circuit is connected with conditioned signal output interface and voltage/current conversion circuit respectively, voltage/current conversion circuit is connected with conditioned signal output interface by current regulating circuit, biased modulate circuit is connected with voltage modulate circuit, is also connected with conditioned signal output interface;
Described biased modulate circuit comprises potentiometer RP11 and constant-current source circuit I1, described constant-current source circuit I1 comprises resistance R42, R43 of power supply and series connection, potentiometer RP11 is in parallel with resistance R42, R43, the brush of potentiometer RP11 is connected with the operational amplifier B of voltage modulate circuit, arranges zero point between R42 and R43.
Another preferred version of the present invention: described passage overvoltage crowbar comprises the overvoltage crowbar with positive and negative plate protective capability being arranged on conditioned signal input interface place and the overtension that prevents being arranged on conditioned signal output interface place damages the two-way TVS diode circuit of circuit.
The external circuit part that AO signal condition is nursed one's health by this programme and signal condition part are provided separately, each signal regulating panel is made only to be responsible for the test signal of 8 signalling channels, so just can according to the number of actual test signal, the quantity of reasonable arrangement signal regulating panel, avoid the waste of signal regulating panel, save set-up time and installing space simultaneously.Voltage signal can obtain the magnitude of voltage of perfect precision and export after carrying out gain and biased conditioning, and this voltage signal utilizes and amplifies the electric current output that modulate circuit can obtain corresponding precision after voltage/current conversion circuit, realizes the voltage and current signal of voltage signal conditioning for having the test specification that transfinites in same functional module.The front end input signal of AO signal regulating device, through the protection of D4 diode, prevents signal voltage on line from transfiniting.The protection that the interface of output terminal is provided with the two-way TVS diode of T3 prevents overtension from damaging circuit.Utilize voltage modulate circuit can realize adjusting " zero point " to amplifier A and increasing the function of bias voltage, thus realize the conditioning functions that transfinites to input voltage signal, and ensure the output accuracy of voltage signal.Interchannel signal in signal regulating panel can carry out wire jumper setting as required, both exportable current signal also exportable voltage signal.Current mode output signal both can have been powered by AO conditioning device and also can be provided power supply by outside.Better protection digitizer Ore-controlling Role hardware device and virtual test technology.
Accompanying drawing explanation
Fig. 1 AO signal regulating device of the present invention structural representation.
Signal regulating panel functional module connection diagram in Fig. 2 AO signal regulating device of the present invention.
The electrical block diagram of signal regulating panel in Fig. 3 AO signal regulating device of the present invention.
Embodiment
As shown in Figure 1, use for the ease of cutting and expansion, AO signal regulating device is taken the structural design that distributor plate is separated with signal regulating panel by this programme, wherein distributor plate there are 1 signal input interface and four signal output interfaces, each signal output interface has 8 signalling channels, the test signal of input is just carried out separately process by such distributor plate, one piece of distributor plate can process 32 signalling channels, according to the distributor plate of the number installation respective numbers of test signal, voltage analog signal output is distributed to signal regulating panel by DB37 connector by distributor plate, the corresponding block signal conditioning plate of each signal output interface on distributor plate, each signal regulating panel is responsible for the signal condition work of 8 signalling channels, every block distributor plate connects four signal regulating panels by 4 DB37 connectors, so just by input test signal with 8 signalling channels for conditioning unit, assign on each signal regulating panel, now just can according to the number of actual test signal, reasonable extensions and cutting are carried out to signal regulating panel, save hardware investment, also install for equipment simultaneously and bring conveniently.The hardware interface of distributor plate is as shown in the table:
Table one, distributor plate interface remarks table
Outside 24VDC power supply is introduced by 1 group of European terminal by distributor plate, and export ± 15V ,+5V power supply respectively through 2 groups of isolation DC/DC modules, for signal regulating panel circuit provides required power supply, DC24V is also for signal regulating panel circuit provides power supply to export simultaneously.Signal between distributor plate and signal regulating panel and power supply are transmitted by DB37 connector completely.For reducing the decay of signal and easy for installation, line length should be controlled within 0.5 meter to 6 meters, this programme preferably adopts the connecting line of about 2 meters, and adopts the cable that diameter is thick as far as possible.
Signal regulating panel can only export simultaneously the signal of a type in same signalling channel: voltage signal or current signal, as shown in Figure 3, when voltage signal exports: by 2 of S1,3 pin short circuits, disconnect the current path on 1 pin, on lead-out terminal, 6 pin are voltage signal, and 5 pin are corresponding to earth signal.When current signal exports: by 1 of S1,2 pin short circuit, disconnect the voltage path on 3 pin, when preventing output current, this pin produces antenna effect and brings interference to circuit, when conditioning plate is outwards powered, short circuit J9 wire jumper, by lead-out terminal 3,2 pin extracted current signal and earth loops; When external input power signal, disconnect J9 wire jumper, 1 pin of lead-out terminal is signal input part, and 3 pin are signal output part.Need to carry out wire jumper setting according to actual environment during specific works, realize the current signal or the voltage signal output that control each signalling channel.Current mode output signal can be powered by AO conditioning device and also can be provided power supply by outside.Voltage signal after conditioning or current signal output on the European terminal of signal regulating panel, are drawn by hardwire mode.The hardware interface of signal regulating panel is as shown in Table 2:
The hardware interface remarks table of table two, signal regulating panel
As shown in Figure 2; voltage test signal is by the DB37 connector entering signal conditioning plate of distributor plate and signal regulating panel; after conditioned signal input interface, overvoltage crowbar, enter voltage modulate circuit and biased modulate circuit, then exported by conditioned signal output interface by two-way TVS diode.Overvoltage crowbar has positive-negative polarity protective capability, produces harm after can preventing input signal malleation or negative pressure from surprisingly exceeding safe range to forward direction and back element.Voltage modulate circuit carries out to test signal the precision that gain can ensure test signal, and tuningout circuit carries out biased arranging the test of transfiniting realizing signal regulating panel to the test signal needed, and two-way TVS second tube sheet can prevent overtension damage circuit.When signalling channel needs the conditioning of current test signal, through the voltage signal of superpotential modulate circuit and biased modulate circuit process, be transported to current regulating circuit through the conversion of voltage/current conversion circuit and carry out gain to current signal, the current signal after gain is exported by conditioned signal output interface through two-way TVS diode.The test signal that conditioned signal output interface obtains, directly can export to digitizer Ore-controlling Role acquisition module and carry out voltage measurement or utilize current signal to drive external unit.
The specific works process of this programme is as follows:
As shown in Figure 3, biased modulate circuit comprises potentiometer RP11 and constant-current source circuit I1, described constant-current source circuit I1 comprises resistance R42, R43 of power supply and series connection, potentiometer RP11 is in parallel with resistance R42, R43, the brush of potentiometer RP11 is connected with the operational amplifier B of voltage modulate circuit, arranges zero point between R42 and R43.Voltage signal conditioning process is as follows: the analog voltage signal of entering signal conditioning plate passage is input to the anode (+InA) of operational amplifier A after overvoltage protection chip D4 after the 1:1 dividing potential drop of resistance R12 and R13, and U1 inside is containing 2 operational amplifier A, B.In this programme, A road is used for signal gain adjustment, be made up of resistance R10, R15, potentiometer RP4, constitute the gain adjusting circuit of in-phase amplifier circuit amplifier A, gain=1+Rf/R and 1+ (R15+x)/(R10+Rp4-x), x is the feedback resistance that the changes in resistance of potentiometer RP4 and R15 form amplifier A, can need select resistance according to actual gain.This programme circuit makes gain=2 by trimmer potentiometer RP4, is divided the voltage signal of half to export after amplifier A amplifies 2 times like this.Be equivalent to the anode being input to amplifier after voltage input signal carries out 50% dividing potential drop, export with original signal amplitude by after the gains of 2 times.
The circuit that amplifier B, potentiometer RP11 and constant-current source circuit I1 form jointly is voltage offset electric circuit, can realize adjusting " zero point " to amplifier A and increasing the function of bias voltage, thus the conditioning functions that transfinites realized input voltage signal, and ensure the output accuracy of voltage signal.This scheme constant-current source circuit I1 produces the constant current source of certain current value, a pressure reduction V is produced like this on R42, R43, as added zero point therebetween, can produce ± V/2 reference voltage on R42 and R43, such regulator potentiometer RP11 just can realize bias voltage and float in-V/2 ~+V/2 scope.Can produce according to this programme that required voltage is biased to transfinite to realize signal.
Do not consider signal transfinite function when, RP11 can be adjusted to 0V, R13 is equivalent to ground connection, such input voltage signal is reduced with original amplitude after being equivalent to be divided half by R12, R13 after 2 times of gains are amplified, if the earth point level so adjusting R13 is equivalent to introduce bias voltage, this bias voltage is the voltage that transfinites.The common superposition of amplifier A, B and biasing circuit completes transfiniting of voltage signal, and voltage output range is broadened.
At work, consider that virtual test technology can output area be ± 10V voltage signal, and digitizer Ore-controlling Role needs the precise acquisition carrying out 0 ~ 10V signal, also need to carry out in the scope of-2 ~ 12V test of transfiniting, and virtual test technology can not export 12V voltage, so this scope is carried out-2V migration processing and will obtain-4V ~ 10V scope, just in time meet the fan-out capability scope of virtual test technology, and this scope and the test specification that transfinites just in time need to superpose+2V a voltage, the side-play amount of this+2V just can have been come by signal conditioning circuit.Like this when virtual test technology exports the voltage signal of-4V ~ 10V, superpose with+2V the bias voltage on signal regulating panel after obtaining-2 ~ 12V and export, the test that can complete normal range signal also can realize the test function of the scope of transfiniting.
The current signal conditioning process of this programme is as follows: as shown in Figure 3, exports for realizing current signal, needs the voltage signal conditioning exported by amplifier U1 to be current signal driving external circuit.The Weak current of input can be amplified certain multiple by the X1 of voltage/current conversion circuit and export by this programme.The output voltage that front end discharge circuit produces converts Weak current signal to through resistance in series R58, amplifies rear drive triode Q3 and is exported by conditioned signal output interface, complete the conditioning process from voltage signal to current signal through X1.Suitable resistance value coordinates the working range that will the current signal after conversion made to meet digitizer Ore-controlling Role with converter.The part that transfinites of voltage signal achieves the ability that transfinites of current signal equally after voltage/current conversion circuit.Because the output current guiding X1 gamut is responsible for by Q3 triode, bears most power consumption, should note during use preventing from Q3 sheet generates heat the error brought.X1 baric flow converter itself is containing current-limiting protection function simultaneously, carries out self-protection when electric current transfinites.
Resistance involved in circuit in this programme all uses high-precision precision resistance, has extremely low temperature drift coefficient; The voltage deviation of the operational amplifier U1 used is less, and temperature drift coefficient is also very low; The element that precision is very high, temperature coefficient is very low that baric flow converter X1 also adopts.The gain-adjusted that the error that circuit and element bring can be built by two amplifiers and bias set circuti are eliminated.By adopting element and the reasonably circuit cooperation of High Precision Low Temperature drift, AO signal regulating device is made to have very high conversion accuracy.
Claims (8)
1. an AO signal regulating device, is characterized in that, comprise distributor plate and the signal regulating panel of independent setting, described distributor plate is connected by connector with signal regulating panel; Signalization modulate circuit on described signal regulating panel, described signal conditioning circuit comprises:
After preventing input signal malleation or negative pressure from surprisingly exceeding safe range, forward direction and back element are produced to the passage overvoltage crowbar of harm;
Input signal is carried out to the voltage modulate circuit of signal gain regulation output, described voltage modulate circuit comprises operational amplifier U1 unit, and described operational amplifier U1 unit comprises operational amplifier A, B;
Carry out increasing bias voltage with the biased modulate circuit making voltage output range broaden to the voltage that gain circuitry exports;
Voltage signal for being accessed by conditioned signal input interface changes over the voltage/current conversion circuit that current signal exports;
The electric current that voltage/current conversion circuit is changed is carried out the current regulating circuit of gain;
Wherein passage overvoltage crowbar is connected with voltage modulate circuit, voltage modulate circuit is connected with conditioned signal output interface and voltage/current conversion circuit respectively, voltage/current conversion circuit is connected with conditioned signal output interface by current regulating circuit, biased modulate circuit is connected with voltage modulate circuit, is also connected with conditioned signal output interface;
Described biased modulate circuit comprises potentiometer RP11 and constant-current source circuit I1, described constant-current source circuit I1 comprises resistance R42, R43 of power supply and series connection, potentiometer RP11 is in parallel with resistance R42, R43, the brush of potentiometer RP11 is connected with the operational amplifier B of voltage modulate circuit, arranges zero point between R42 and R43.
2. a kind of AO signal regulating device as claimed in claim 1, it is characterized in that, described distributor plate is provided with signal input interface and signal output interface, described signal regulating panel is provided with conditioned signal input interface, signal conditioning circuit and conditioned signal output interface, the signal output interface of described distributor plate is connected by connector with the conditioned signal input interface of signal regulating panel.
3. a kind of AO signal regulating device as claimed in claim 2, it is characterized in that, signal input interface on described distributor plate is one, signal output interface is four, signal input interface is one group with 8 signalling channels and the test signal of reception is given each signal output interface, distributor plate is provided with the voltage conversion circuit of external input voltage, each signal regulating panel is responsible for the test signal of conditioning 8 signalling channels, and four signal output interfaces of described distributor plate can be connected by four connectors with the conditioned signal input interface of four signal regulating panels at most.
4. a kind of AO signal regulating device as claimed in claim 1; it is characterized in that, described passage overvoltage crowbar comprises the overvoltage crowbar with positive-negative polarity protective capability being arranged on conditioned signal input interface place and the overtension that prevents being arranged on conditioned signal output interface place damages the two-way TVS diode circuit of circuit.
5. a kind of AO signal regulating device as claimed in claim 1, it is characterized in that, the conditioning process of voltage signal conditioning circuit is as follows: the analog voltage signal of entering signal conditioning plate passage is input to the anode+InA of operational amplifier A after overvoltage protection chip D4 after the 1:1 dividing potential drop of resistance R12 and R13, U1 inside is containing 2 operational amplifier A, B, A road is used for signal gain and regulates, by resistance R10, R15, potentiometer RP4 forms, constitute the gain adjusting circuit of in-phase amplifier circuit amplifier A, amplifier B, the circuit that potentiometer RP11 and constant-current source circuit I1 forms jointly is voltage offset electric circuit, realize adjusting " zero point " to amplifier A and increasing the function of bias voltage, thus the conditioning functions that transfinites realized input voltage signal, and ensure the output accuracy of voltage signal, wherein constant-current source circuit I1 produces the constant current source of certain current value, such regulator potentiometer RP11 just can realize bias voltage and float in-V/2 ~+V/2 scope.
6. a kind of AO signal regulating device as claimed in claim 3, is characterized in that, described external input voltage is 24V, and the system standard voltage exported through voltage conversion circuit be ± 15V and+5V voltage.
7. a kind of AO signal regulating device as claimed in claim 1, it is characterized in that, the connector between described distributor plate and signal regulating panel adopts DB37 connector.
8. a kind of AO signal regulating device as claimed in claim 7, the line length > 0.5 meter of described DB37 connector and < 6 meters.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010553098.5A CN102478596B (en) | 2010-11-22 | 2010-11-22 | A kind of AO signal regulating device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201010553098.5A CN102478596B (en) | 2010-11-22 | 2010-11-22 | A kind of AO signal regulating device |
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| CN102478596A CN102478596A (en) | 2012-05-30 |
| CN102478596B true CN102478596B (en) | 2016-04-06 |
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| CN108153279A (en) * | 2017-12-20 | 2018-06-12 | 上海默松控制系统设备有限公司 | A kind of hardware automated test devices of EKE |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1797357A (en) * | 2004-12-30 | 2006-07-05 | 鸿富锦精密工业（深圳）有限公司 | Circuit board for testing function of main board |
| US7683647B1 (en) * | 2008-09-05 | 2010-03-23 | Keithley Instruments, Inc. | Instrument per pin test head |
| CN201622146U (en) * | 2010-03-12 | 2010-11-03 | 淄博飞雁先行测控技术有限公司 | Low power consumption two-wire system 4-20mA output pressure transmitter circuit |
| CN201974463U (en) * | 2010-11-22 | 2011-09-14 | 北京广利核系统工程有限公司 | AO signal conditioning device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080315862A1 (en) * | 2007-06-21 | 2008-12-25 | Qualitau, Inc. | Smart parallel controller for semiconductor experiments |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1797357A (en) * | 2004-12-30 | 2006-07-05 | 鸿富锦精密工业（深圳）有限公司 | Circuit board for testing function of main board |
| US7683647B1 (en) * | 2008-09-05 | 2010-03-23 | Keithley Instruments, Inc. | Instrument per pin test head |
| CN201622146U (en) * | 2010-03-12 | 2010-11-03 | 淄博飞雁先行测控技术有限公司 | Low power consumption two-wire system 4-20mA output pressure transmitter circuit |
| CN201974463U (en) * | 2010-11-22 | 2011-09-14 | 北京广利核系统工程有限公司 | AO signal conditioning device |
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Address after: 100084 Beijing city Haidian District Nongda Road No. 1 Building No. 9 hospital million Liang Jing City Applicant after: Beijing Guangli Nuclear Power Co., Ltd. Applicant after: China General Nuclear Power Corporation Address before: 100084 Beijing city Haidian District Nongda Road No. 1 Building No. 9 hospital million Liang Jing City Applicant before: Beijing Guangli Nuclear Power Co., Ltd. Applicant before: China Guangdong Nuclear Power Group Co., Ltd. |
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Inventor after: Cao Zongsheng Inventor after: He Wei Inventor after: Song Lixin Inventor after: Meng Guangguo Inventor after: Pei Hongwei Inventor before: Cao Zongsheng Inventor before: Song Lixin Inventor before: Meng Guangguo Inventor before: Pei Hongwei |