CN102692883A - An analog input circuit for engineering-machinery-dedicated controller - Google Patents
An analog input circuit for engineering-machinery-dedicated controller Download PDFInfo
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- CN102692883A CN102692883A CN2012100838185A CN201210083818A CN102692883A CN 102692883 A CN102692883 A CN 102692883A CN 2012100838185 A CN2012100838185 A CN 2012100838185A CN 201210083818 A CN201210083818 A CN 201210083818A CN 102692883 A CN102692883 A CN 102692883A
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Abstract
Description
Technical field
The present invention relates to a kind of input circuit, relate in particular to a kind of simulated measurement input circuit of engineering machinery nonshared control unit.
Background technology
In China's construction machinery industry automatic field opertaing device, controller signals also has the imported analog quantity input signal of resistance except common analog quantity voltage input signal, current input signal at present.And the ubiquitous problem of analog quantity input (sampling) circuit: 1) comparatively simple to the Acquisition Circuit design of analog signals, lack isolation design, passage is difficult to satisfy the more needs in engineering machinery control system collection point less; 2) the engineering machinery scene exists signal to disturb greatly again, can cause the analog signals Acquisition Error big, and distorted signals impacts for control system integral body, can not satisfy the requirement of high-precision analog amount signals collecting; 3) some sensor signals are to exist with the resistance input mode in the engineering mechanical device.
Less to the research of analog quantity resistance input circuit on the engineering machinery opertaing device in the market, the simulated measurement input circuit patent research mainly concentrates on sampling interface channel quantity, aspects such as sampling precision and interference free performance.Simulated measurement input circuit is designed; Adopting the light-coupled isolation mode aspect the circuit sampling buffer circuit mostly; When isolating IO channel with photoelectrical coupler; Must all isolate all signals (comprising digital signal, control signal, status signal), make segregate both sides have no the contact on the electrical equipment, otherwise this isolation have no meaning.
Summary of the invention
To the problem of above-mentioned existence, the purpose of this invention is to provide a kind of simulated measurement input circuit of engineering machinery nonshared control unit, can effectively protect Acquisition Circuit, enlarge the analog data acquisition range, have applying flexible, characteristics easy to use, with low cost.
The objective of the invention is to realize through following technical proposals:
A kind of simulated measurement input circuit of engineering machinery nonshared control unit; Wherein, Comprise a current/charge-voltage convertor and an analog quantity voltage input circuit; Said current/charge-voltage convertor is an electric current Series Negative Feedback Amplifier circuit, and said analog quantity voltage input circuit comprises a RC filtering circuit that connects successively, in-phase amplification circuit and buffer circuit; Said RC filtering circuit input connects the current output terminal of said current/charge-voltage convertor, and said buffer circuit exports the A/D sample port of control module to.
In another embodiment of the present invention, said current/charge-voltage convertor converts the 0-5V d. c. voltage signal to the current signal of 0-10mA linearly.
In another embodiment of the present invention; Said current/charge-voltage convertor comprises first operational amplifier; Be serially connected with the 2nd RC filtering circuit that constitutes by R2103 and C2102 between said first operational amplifier and the WV V2401; Ground connection behind the inverting input connecting resistance R2403 of said first operational amplifier; The normal phase input end of said first operational amplifier meets Vin through resistance R 2401, is serially connected with resistance R 2402 between the normal phase input end of said first operational amplifier and the pull-up resistor R, series resistor R2404 between the inverting input of said first operational amplifier and the output terminal; The output terminal of said first operational amplifier also is serially connected with voltage stabilizing diode Z2101 through the end of resistance R 2405 connection pull-up resistor R between the earth terminal of said pull-up resistor R and said resistance R 2403.
In another embodiment of the present invention, a said RC filtering circuit is made up of resistance R 2101 and capacitor C 2101.
In another embodiment of the present invention; Said in-phase amplification circuit comprises second operational amplifier; The inverting input of said second operational amplifier is through resistance R 2408 ground connection; Be serially connected with resistance R 2407 between the inverting input of said second operational amplifier and the output terminal; Be serially connected with the 3rd RC filtering circuit that is made up of resistance R 2104 and capacitor C 2103 between said second operational amplifier and the WV V2402, the normal phase input end of said second operational amplifier is through resistance R 2102 ground connection.
In another embodiment of the present invention; Said buffer circuit comprises the 3rd operational amplifier; Be serially connected with resistance R 2701 between the output terminal of the normal phase input end of said the 3rd operational amplifier and said second operational amplifier; Be serially connected with the 4th RC filtering circuit that constitutes by resistance R 2105 and capacitor C 2101 between said the 3rd operational amplifier and the WV V2403; The inverting input of said the 3rd operational amplifier is connected with the output terminal of said the 3rd operational amplifier through resistance R 2702, and the output terminal of said the 3rd operational amplifier also is connected with the 5th RC filtering circuit that is made up of resistance R 2703 and capacitor C 2104.
In another embodiment of the present invention, the variation range of said pull-up resistor R is 0-130 Ω.
Another technical scheme of the simulated measurement input circuit of a kind of engineering machinery nonshared control unit of the present invention is: comprise a resistance meausring bridge and a differential amplifier circuit; Said resistance meausring bridge comprises resistance R 2401; Resistance R 2402 and resistance R 2403; Said resistance R 2402 and said resistance R 2403 serial connection back ground connection; Said resistance 2401 and pull-up resistor R serial connection back ground connection, RC filtering circuit that constitutes by resistance R 2101 and capacitor C 2101 of serial connection between said resistance meausring bridge and the power supply V; Said differential amplifier circuit comprises an operational amplifier; The normal phase input end of said operational amplifier is through resistance R 2103 ground connection; The inverting input of said operational amplifier is connected the output terminal of said operational amplifier through the 2nd RC filtering circuit that is made up of resistance R 2405 and capacitor C 2104; Be serially connected with between said operational amplifier and the power supply V2401 by resistance R 2104 and capacitor C 2103 and constitute the 3rd RC filtering circuit; The normal phase input end of said operational amplifier is connected with said resistance meausring bridge through the 4th RC circuit that is made up of resistance R 2102 and capacitor C 2102, and the inverting input of said operational amplifier is connected with said resistance meausring bridge through resistance R 2404.
In another embodiment of the present invention; Said resistance R 2102 resistance values equate with said resistance R 2404 resistance values; Said resistance R 2103 resistance values equate that with said resistance R 2405 resistance values said resistance R 2102 is far longer than said resistance R 2401 resistance values with the resistance value sum of said resistance R 2103.
Compared with present technology, beneficial effect of the present invention is:
Analog quantity resistance input circuit in the present invention's design; The input circuit input end adopts the high resistant protected mode, and the filtering circuit of resistance capacitance formation, with the buffer circuit of certain input impedance; Can prevent effectively that the perturbation signal from pouring in, improve the signals collecting anti-interference; Input circuit can change the scope of sampling resistor through the enlargement factor of adjustment in-phase amplification circuit; It is adjustable to satisfy analog quantity resistance input range through the size of regulating the constant-current source circuit output current, and measuring accuracy is 0.5% * full scale at 25 ℃.
Description of drawings
Fig. 1 is the circuit diagram of an embodiment of the simulated measurement input circuit of engineering machinery nonshared control unit of the present invention;
Fig. 2 is the circuit diagram of another embodiment of the simulated measurement input circuit of engineering machinery nonshared control unit of the present invention.
Embodiment
Below in conjunction with schematic diagram and concrete operations embodiment the present invention is described further.
Simulated measurement input circuit of the present invention is based on the part in the controller circuitry of DSP (model is TMS320F2812) main control chip; The entire controller circuit also comprises other parts: the switching value input; Analog quantity D/A output circuit; Power circuit, memory module and communication unit are partly formed.Based on the controller circuitry of DSP control module, 16 tunnel analog quantity input interfaces can be provided, enriched interface resource greatly.
Fig. 1 shows the circuit diagram of an embodiment of the simulated measurement input circuit of engineering machinery nonshared control unit of the present invention; As shown in the figure; This circuit comprises a current/charge-voltage convertor and an analog quantity voltage input circuit; Current/charge-voltage convertor is an electric current Series Negative Feedback Amplifier circuit, and the analog quantity voltage input circuit comprises a RC filtering circuit that connects successively, in-phase amplification circuit and buffer circuit; The input of the one RC filtering circuit connects the current output terminal of current/charge-voltage convertor, and buffer circuit exports the A/D sample port of control module to.
Wherein, Current/charge-voltage convertor comprises first operational amplifier; Be serially connected with the 2nd RC filtering circuit that constitutes by R2103 and C2102 between first operational amplifier and the WV V2401; Ground connection behind the inverting input connecting resistance R2403 of first operational amplifier; The normal phase input end of first operational amplifier meets Vin through resistance R 2401, is serially connected with series resistor R2404 between inverting input and the output terminal of resistance R 2402, the first operational amplifiers between the normal phase input end of first operational amplifier and the pull-up resistor R; The output terminal of first operational amplifier also is serially connected with voltage stabilizing diode Z2101 through the end of resistance R 2405 connection pull-up resistor R between the earth terminal of pull-up resistor R and resistance R 2403.Preferably, a RC filtering circuit is made up of resistance R 2101 and capacitor C 2101.
In-phase amplification circuit comprises second operational amplifier; The inverting input of second operational amplifier is through resistance R 2408 ground connection; Be serially connected with resistance R 2407 between the inverting input of second operational amplifier and the output terminal; Be serially connected with the 3rd RC filtering circuit that is made up of resistance R 2104 and capacitor C 2103 between second operational amplifier and the WV V2402, the normal phase input end of second operational amplifier is through resistance R 2102 ground connection.
Buffer circuit comprises the 3rd operational amplifier; Be serially connected with resistance R 2701 between the output terminal of the normal phase input end of the 3rd operational amplifier and second operational amplifier; Be serially connected with the 4th RC filtering circuit that constitutes by resistance R 2105 and capacitor C 2101 between the 3rd operational amplifier and the WV V2403; The inverting input of the 3rd operational amplifier is connected with the output terminal of the 3rd operational amplifier through resistance R 2702, and the output terminal of the 3rd operational amplifier also is connected with the 5th RC filtering circuit that is made up of resistance R 2703 and capacitor C 2104.Wherein, the variation range of pull-up resistor R is 0-130 Ω.
This circuit prime is a voltage-to-current translation circuit; Introduce electric current series connection negative feedback in the amplifying circuit; Can realize the conversion of voltage-to-current; Can the d. c. voltage signal of 0-5V be converted linearly to the current signal of 0-10mA, the big I of output current is passed through computes: I=Vin/R2405.Need pull-up resistor R there be earth terminal in the practical application, sees, both introduce negative feedback in the circuit, introduce positive feedback again from physical concept.When satisfying R2404/R2403=R2402/R2401, the increase of the I that reduces to cause because of load R approximates reducing of the I that causes because of positive feedback effect, promptly just in time offsets, because I becomes the controlled source of Vin, to accomplish the conversion of voltage-to-current.
The resistance type sensor signal is inserted current output terminal, can obtain the magnitude of voltage on the sensor.The circuit latter half is an analog quantity voltage input circuit; The sensor resistance analog signals obtains the RC filtering circuit of voltage signal through R2101 and C2101 formation through the constant-current source circuit effect; The signal that collects is handled; Send into the in-phase amplification circuit that a next end constitutes, the A/D sample port of control module sent into signal by the buffer circuit that constitutes through the one-level follower again.
Main control circuit based on DSP (model of DSP is TMS320F2812) here provides 16 road A/D sampling channels, can satisfy the input of 16 analog signalses simultaneously, has improved control interface quantity greatly.If cooperate the controller system of two control chips, can access 32 tunnel analog acquisition passage.For engineering mechanical device provides a kind of high reliability and the hyperchannel demand of analog acquisition simultaneously, can improve the performance of control system simultaneously to the analog signals acquisition process of the oil level in the plant equipment, pressure, temperature and walking action control.Because of the present invention all is the technical grade components and parts, adaptable range of stability is-30～70 ℃, can be fit to long range measurements comparatively working under the rugged environment.Input circuit input end of the present invention adopts the high resistant protected mode, and the filtering circuit of resistance capacitance formation, with the buffer circuit of certain input impedance, can prevent effectively that the perturbation signal from pouring in, and has stronger interference free performance.In addition, high-precision analog amount input signal sampling of the present invention, measuring accuracy is 0.5% * full scale at 25 ℃.
In a variant; As shown in Figure 2, simulated measurement input circuit of the present invention comprises a resistance meausring bridge and a differential amplifier circuit, and resistance meausring bridge comprises resistance R 2401; Resistance R 2402 and resistance R 2403; Resistance R 2402 and resistance R 2403 serial connection back ground connection, resistance 2401 and pull-up resistor R serial connection back ground connection, RC filtering circuit that constitutes by resistance R 2101 and capacitor C 2101 of serial connection between resistance meausring bridge and the power supply V.Differential amplifier circuit comprises an operational amplifier; The normal phase input end of operational amplifier is through resistance R 2103 ground connection; The inverting input of operational amplifier is through the output terminal of the 2nd RC filtering circuit concatenation operation amplifier that is made up of resistance R 2405 and capacitor C 2104; Be serially connected with between operational amplifier and the power supply V2401 by resistance R 2104 and capacitor C 2103 and constitute the 3rd RC filtering circuit; The normal phase input end of operational amplifier is connected with resistance meausring bridge through the 4th RC circuit that is made up of resistance R 2102 and capacitor C 2102, and the inverting input of operational amplifier is connected with resistance meausring bridge through resistance R 2404.
In the present embodiment,, require R2102=R2404 for making the differential amplifier input current balance, R2103=R2405, and (R2102+R2103) R2401.Because the work of the operational amplifier single supply in the present embodiment; In the changes in resistance scope; The positive input of operational amplifier will be imported greater than anti-phase forever; But the measuring bridge in the present embodiment can overcome the most of fluctuation of voltage signal source V, but can not thoroughly remove, and only suitable short distance is measured.
Rig-site utilization shows, analog quantity resistance input circuit of the present invention has that antijamming capability is strong, reliability is high, compatibility is good, applying flexible, characteristics such as easy to operate, can adapt to abominable site environment, is applicable in the control circuit of engineering mechanical device.
More than specific embodiment of the present invention is described in detail, but the present invention is not restricted to the specific embodiment of above description, it is just as example.To those skilled in the art, any equivalent modifications and alternative also all among category of the present invention.Therefore, not breaking away from impartial conversion and the modification of having done under the spirit and scope of the present invention, all should contain within the scope of the invention.
Claims (9)
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210083818.5A CN102692883B (en) | 2012-03-27 | 2012-03-27 | An analog input circuit for engineering-machinery-dedicated controller |
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| CN201210083818.5A CN102692883B (en) | 2012-03-27 | 2012-03-27 | An analog input circuit for engineering-machinery-dedicated controller |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103702102A (en) * | 2013-12-31 | 2014-04-02 | 青岛歌尔声学科技有限公司 | Antijamming signal processing circuit and antijamming 3D (three dimensional) spectacles |
| CN104052417A (en) * | 2013-03-11 | 2014-09-17 | 成都艺创科技有限公司 | Magnetic head amplification circuit used for router |
| CN104536416A (en) * | 2014-12-25 | 2015-04-22 | 重庆川仪自动化股份有限公司 | Analog quantity input acquisition circuit for restraining electromagnetic interference in industrial control system |
| CN105444921A (en) * | 2015-11-04 | 2016-03-30 | 中国北方发动机研究所(天津) | Signal imitation circuit and method for thermocouple sensor |
| CN106603078A (en) * | 2016-12-21 | 2017-04-26 | 中国航空工业集团公司雷华电子技术研究所 | Circuit for improving ADC sampling accuracy |
| CN106989793A (en) * | 2017-04-28 | 2017-07-28 | 中航工业南航（深圳）测控技术有限公司 | Sample circuit and detection means |
| CN107425845A (en) * | 2017-05-08 | 2017-12-01 | 华为技术有限公司 | A kind of superposition circuit and floating voltage D/A converting circuit |
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| CN1874160A (en) * | 2005-06-02 | 2006-12-06 | 台达电子工业股份有限公司 | Equipment for converting and insulating analog signals |
| CN101701980A (en) * | 2009-12-04 | 2010-05-05 | 株洲南车时代电气股份有限公司 | Current and voltage detection method of internal-combustion locomotive and device thereof |
| CN102025364A (en) * | 2010-12-28 | 2011-04-20 | 福州大学 | Analog quantity input circuit using digital isolation and conditioning technology |
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2012
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US6608583B1 (en) * | 2002-04-30 | 2003-08-19 | Oki Electric Industry Co., Ltd. | Analog signal input circuit in analog signal processing apparatus |
| CN2690931Y (en) * | 2004-03-19 | 2005-04-06 | 常继军 | Constant temperature intelligent controller |
| CN1874160A (en) * | 2005-06-02 | 2006-12-06 | 台达电子工业股份有限公司 | Equipment for converting and insulating analog signals |
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| CN102025364A (en) * | 2010-12-28 | 2011-04-20 | 福州大学 | Analog quantity input circuit using digital isolation and conditioning technology |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104052417A (en) * | 2013-03-11 | 2014-09-17 | 成都艺创科技有限公司 | Magnetic head amplification circuit used for router |
| CN103702102A (en) * | 2013-12-31 | 2014-04-02 | 青岛歌尔声学科技有限公司 | Antijamming signal processing circuit and antijamming 3D (three dimensional) spectacles |
| CN103702102B (en) * | 2013-12-31 | 2016-03-16 | 青岛歌尔声学科技有限公司 | A kind of jamproof signal processing circuit and a kind of anti-interference 3D glasses |
| CN104536416A (en) * | 2014-12-25 | 2015-04-22 | 重庆川仪自动化股份有限公司 | Analog quantity input acquisition circuit for restraining electromagnetic interference in industrial control system |
| CN104536416B (en) * | 2014-12-25 | 2017-05-10 | 重庆川仪自动化股份有限公司 | Analog quantity input acquisition circuit for restraining electromagnetic interference in industrial control system |
| CN105444921A (en) * | 2015-11-04 | 2016-03-30 | 中国北方发动机研究所(天津) | Signal imitation circuit and method for thermocouple sensor |
| CN106603078A (en) * | 2016-12-21 | 2017-04-26 | 中国航空工业集团公司雷华电子技术研究所 | Circuit for improving ADC sampling accuracy |
| CN106603078B (en) * | 2016-12-21 | 2020-11-27 | 中国航空工业集团公司雷华电子技术研究所 | Circuit for improving ADC sampling precision |
| CN106989793A (en) * | 2017-04-28 | 2017-07-28 | 中航工业南航（深圳）测控技术有限公司 | Sample circuit and detection means |
| CN107425845A (en) * | 2017-05-08 | 2017-12-01 | 华为技术有限公司 | A kind of superposition circuit and floating voltage D/A converting circuit |
| US10804923B2 (en) | 2017-05-08 | 2020-10-13 | Huawei Technologies Co., Ltd | Superposition operation circuit and float-voltage digital-to-analog conversion circuit |
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| CN102692883B (en) | 2014-08-06 |
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